Territorial E ﬀ ects of Shared-Living Heritage Regeneration

: The paper presents further steps of study started by authors in recent years, as part of the widest international research collaboration, which focuses on shared life and regeneration of abandonment of rural settlements as strategies for the development of sustainable territories. This research aims to understand how the regeneration of ancient community buildings impacts on the sustainable development of the local context. To understand these e ﬀ ects, the research considered four traditional typologies of community buildings, from di ﬀ erent cultures: Tulou (China), Cascina (Italy), Hacienda (Mexico), and Marae (New Zealand). Among the tens / hundreds of contemporary regeneration interventions, three contemporary projects per each of these typologies have been selected. To assess the territorial impact of the projects a new approach has been deﬁned using Expert Interviews as the methodology, so as to be able to have an assessment directly by experts in the ﬁelds of regenerative projects and sustainable development. The Expert Interviews were held based on a questionnaire that assessed the e ﬀ ects of the projects. For the evaluation of the projects, two categories of indicators have been selected: (1) United Nations SDGs, (2) architectural regeneration indicators generated by the study “The Role of Cultural Heritage in Sustainable Development: Multidimensional Indicators as Decision-Making Tool”, by Francesca Nocca, published in Sustainability (2017, 9, 1882). The research outputs show how the urban-architectural regeneration of these historical typologies can be clearly associated with indications of sustainable development. The results also show that in all four cultures the regeneration of historic buildings provides many beneﬁts to local communities by successfully mixing di ﬀ erent income groups and the inclusion of marginalized or vulnerable groups. The four selected typologies, which are explained in the following pictures, are Tulou (Fujian, China) [40,41], Cascina (Northern Italy, Europe) [40,42], Hacienda (Mexico) [40,43] and Marae (New Zealand) [40,44,45]. These typologies are explained in Figures 1–4, which represent some pages of the booklet prepared by the authors for the Expert interview. This choice was made because the authors want to show, as much as possible, the material used during the research. The 60-pages booklet used in the Expert Interview is available to everyone, at the following link (https: // www.dropbox.com / s / tp6tuhetr9u8r8z / = 0) [46]. of sustainable impacts on territories.


Introduction
The idea that regeneration practices are related to the sustainable development of territories, cities, and local communities is now established in contemporary academic literature as well as in common awareness [1,2]. In fact, the association between regenerative practices and sustainable development is not limited to the academic sphere but it is strongly accepted both by the urban-architectural design practice, and the government sector which increasingly promotes regeneration projects to

Historic Urban Landscapes
The concept of Historic Urban Landscapes (HULs) is not new, but its potential in today's world is. The concept draws from experience in urban conservation and cultural landscapes, seeking to encompass values relating to intangible heritage, genius loci, authenticity, and integrity [28,29].
HULs extend beyond the traditional boundaries of historic cities or districts to encompass the larger territory of their urban, rural, and/or natural settings, which also require conservation and management. The physical character of HULs is defined as much by their urban and architectural traits as by their natural setting, the geographic elements that preceded them and shaped their growth, and the resulting viewsheds.
Managing an HUL focuses on the dual challenge of enhancing the vitality of historic cities and of integrating contemporary architecture in an emerging conceptualization of historic cities as historic urban landscapes [30]. Traditionally, the authenticity of a place has been linked to materials, design, workmanship, and setting-the importance of physical tangible evidence. However, the original character of some places was not defined by human-made elements but by natural formations or the more ethereal concept of genius loci. According to Gustavo Araoz [30], this apparent need to venerate and preserve the material legacy inherited from the past has been codified by conservation experts through the attribution of two types of values to the materiality of place: the aesthetic value and the historic value. This means that either the physical elements of these places contained communal memories or enriched the observer through sensory delight.
However, the HUL approach suggests that in historic cities the process of change per se can be an integral component of the significance of the place, and not only the aesthetic values. Association to historic or communal memories is as important as the new traces that are conceived through contemporary developments. The implications of allowing historic cities to continue to evolve along historic patterns have been explored, and experiments of individualistic "look at me" type of public Sustainability 2020, 12, 8616 4 of 28 architecture, facadism, and buildings of unprecedented heights in close proximity to historic districts allow for the integration of the HUL discourse a key statement for an integrated approach linking contemporary architecture, sustainable urban development and landscape integrity based on historic patterns, building stocks and context [29].
There are two unrelated trends in the debate of regeneration of historic urban landscapes, one being a conceptual shift in the perception of the nature of heritage places, and the second related to the accelerating demographic pressure to increase urban density [28,30]. Historic cities are being treated as laboratories for experiments on high density, gentrification, and cultural appropriation, among others, directly affecting the cultural heritage and other tangible and intangible aspects of the site.
HULs planning interventions must be conceived as an integral part of the overall urban-management effort to bring socio-economic development and a better quality of life for the existing population. Shared-living in historic urban landscapes must be promoted not only to enhance stewardship and community management towards historic sites and buildings but also as part of a more sustainable approach, remembering Carl Elefante's [31] iconic phrase "The greenest building is the one that is already built".
Historic revitalization projects are relatively smaller than traditional new developments within the same areas since historic buildings share space composition attributes that do not necessarily qualify for the specific new functions. Intergenerational projects are more likely to succeed in HULs due to traditional neighborhood amenities, and a sense of remembrance for the elderly, as well as a sense of community for new generations.
Shared-living or cohousing communities can model good preservation of historic urban settings by successfully mixing residential incomes, stabilizing vulnerable or marginalized groups, redeveloping a small neighborhood block, and redesigning the way building retrofit is done. There are several examples of how historic places are converted into shared living projects. Examples are presented and discussed in this article.
There are many benefits in retrofit projects converted into shared communities, for instance, it prolongs senior resident independence; it sees more involvement and participation in volunteerism and local politics; and finally, it enables the ability of communities to collaborate with each other showing a potential effect within a larger community [32].
The notion behind the holistic management of historic landscapes is to secure their evolutionary development, considering issues of ecological sustainability as well as geo-cultural distinctiveness and identity. It is as much people-driven as it is artifact-driven. Management is focused on the inhabitants and others who conduct their daily lives within historic urban sites, without which it becomes difficult to serve a range of activities and the essential ingredient of a sense of place.

Literature Review, Knowledge Gap, and Research Question
Within this framework, it is clear how the current literature highlights (1) the great value that architectural typologies of shared living have for communities and territories and (2) the sustainable characteristics that often characterize the heritage regenerative projects. In addition to these macro-considerations, another aspect clearly emerges: (3) the introverted attitude of the original SLHs, which saw that closing themselves outwards had the possibility of protecting the community from external dangers. Actually, this last consideration can be extended also to other SLHs that the authors decided not to consider in this work to keep the research focus. Clear examples are the Kraal, the underground building of Matmata, or the Shabono [12,[33][34][35]. Finally, (4) considering how these architectural enclosure providing the protection needed for have changed in the vast majority of cases, the research question that led to the development of this work emerges: now that these typologies are opening up to the local context-not dangerous anymore. Do SLH continue to be an element of valorization of local communities as well as a promoter for territorial sustainable development? And, in particular, what effects do these regenerative projects have on territories and local communities? Our research discusses how the urban-architectural regeneration of these historical typologies can often be clearly associated with indications of sustainable development.

Materials and Methods
To answer the research question, the Expert Interviews methodology has been adopted as the main strategy. The panorama of Architecture Research Methodology is extremely rich and interesting [36] and, in fact, this methodology is widely used by the scientific community in the architectural-urban context as a tool for analysis and interpretation of contemporary phenomena. As argued by Meuser and Nagel "The Expert Interview as a method of qualitative empirical research, designed to explore expert knowledge, has been developed considerably since the early 1990s" [37].
The Expert Interview methodology is widely discussed, and the existing literature review provides a very clear and structured theoretical framework. Basically, this methodology, particularly used in the interpretative social research, requires that authors ask opinions to people considered "experts in their field" with the aim of (1) exploring, (2) systematizing, or (3) theory-generating [38]. There are various reasons why such a methodology could be considered adequate in fields like the one of this research: first of all, the "fact that respondents are highly qualified in the analyzed question, eliminates the need to use additional screening and clarifying questions aimed at revealing true, but hidden from the interviewer respondent views" [39]. In essence, therefore, the data obtained have the reliability that does not require additional considerations and it is possible to obtain a good representation of the studied phenomenon with relative transparency and correctness. Furthermore, as a methodology, it is flexible enough, so that it can be applied individually (as in the case of this research) or in a context of triangulation of methods [37]. However, one should not lose sight of the fact that the Expert Interview is still an interview methodology that, although providing a privileged and more reliable point of view, always remains the representation of different points of view [37]. Undoubtedly, this reliability depends very much on the correct choice of experts and on the material provided for discussion.
Who to consider as an "expert" is, in fact, very important and assumes a central role in the organization of the process. Meuser and Nagel quoting the study of Hitzler, Honer, and Maeder, provide us the definition of an expert. An "expert" is a person, who has knowledge of his own area of interest and who, at the same time, possesses an "institutionalized authority to construct reality" [37]. The importance of defining experts is emphasized also by Libakova and Sertakova who highlight how the concept of "expert" must ensure certain criteria, including, "education and skills, position, related to the research topic, work experience in the subject in question, the degree of quality of the prior expert judgments, the level of public recognition, objectivity of the submitted ratings" [39].
At the same time, the quality of the material provided to the experts, so they can develop a clear idea of the topic of discussion and evaluation, is equally important. In this sense, preparing guidelines that highlight a shared common context is recognized as an extremely effective practice, guaranteeing comparability of the results and a focus on the relevant topics against a horizon of other possibilities [37].
According to the essence of an Expert Interview methodology, the research work was structured according to the following steps: (1) definition of the types of Shared Living Heritage (SLH) to be studied, contemplating the enormous differences between housing cultures all around the world; (2) definition of recent regeneration projects and collection of a sufficient quantity of material for in-depth case studies; (3) definition of the indicators useful for studying and analyzing the territorial effects of the projects and the territorial and community role assumed by the SLH following regeneration; (4) carrying out Expert Interview according to the methods recommended by contemporary academic literature, which will be better explained later; (5) collection and analysis of the results of the Expert Interviews.

Definition of the Four Shared Living Heritage (SLH) Typologies
According to the research objective, four architectural typologies have been defined with the following characteristics: (1) historical relevance as community building; (2) having been the object of several regeneration projects in the last decades; (3) possibility of access to a significant quantity of material, suitable for analyzing projects. Furthermore, the four typologies have been selected in four different geographical areas and consequently are expressions from different cultures. The four selected typologies, which are explained in the following pictures, are Tulou (Fujian, China) [40,41], Cascina (Northern Italy, Europe) [40,42], Hacienda (Mexico) [40,43] and Marae (New Zealand) [40,44,45]. These typologies are explained in Figures 1-4, which represent some pages of the booklet prepared by the authors for the Expert interview. This choice was made because the authors want to show, as much as possible, the material used during the research. The 60-pages booklet used in the Expert Interview is available to everyone, at the following link (https://www.dropbox.com/s/ tp6tuhetr9u8r8z/Expert%20Interview_booklet.pdf?dl=0) [46].
According to the research objective, four architectural typologies have been defined with the following characteristics: (1) historical relevance as community building; (2) having been the object of several regeneration projects in the last decades; (3) possibility of access to a significant quantity of material, suitable for analyzing projects. Furthermore, the four typologies have been selected in four different geographical areas and consequently are expressions from different cultures.
The four selected typologies, which are explained in the following pictures, are Tulou (Fujian, China) [40,41], Cascina (Northern Italy, Europe) [40,42], Hacienda (Mexico) [40,43] and Marae (New Zealand) [40,44,45]. These typologies are explained in Figures 1-4, which represent some pages of the booklet prepared by the authors for the Expert interview. This choice was made because the authors want to show, as much as possible, the material used during the research. The 60-pages booklet used in the Expert Interview is available to everyone, at the following link (https://www.dropbox.com/s/tp6tuhetr9u8r8z/Expert%20Interview_booklet.pdf?dl=0) [46].   According to the research objective, four architectural typologies have been defined with the following characteristics: (1) historical relevance as community building; (2) having been the object of several regeneration projects in the last decades; (3) possibility of access to a significant quantity of material, suitable for analyzing projects. Furthermore, the four typologies have been selected in four different geographical areas and consequently are expressions from different cultures.
The four selected typologies, which are explained in the following pictures, are Tulou (Fujian, China) [40,41], Cascina (Northern Italy, Europe) [40,42], Hacienda (Mexico) [40,43] and Marae (New Zealand) [40,44,45]. These typologies are explained in Figures 1-4, which represent some pages of the booklet prepared by the authors for the Expert interview. This choice was made because the authors want to show, as much as possible, the material used during the research. The 60-pages booklet used in the Expert Interview is available to everyone, at the following link (https://www.dropbox.com/s/tp6tuhetr9u8r8z/Expert%20Interview_booklet.pdf?dl=0) [46].

Definition of the Regeneration Projects
Three recently regenerated projects were selected for each typology. This decision was made considering a good balance between the need to provide a varied representation of the design approach (one or two cases per typology would not have been sufficient) and the need to have an in-depth analysis in terms of information useful for evaluating the project by the experts (a greater number of projects would have meant reducing the attention that the experts could provide analyzing the phenomena and, therefore it would have represented an incapacity to deeply analyze the projects).
Moreover, these projects have been selected from the panorama of local regeneration projects, excluding all those demolition and reconstruction of SLH that are oriented to the mere real estate market of selling houses in old-style buildings. Unfortunately, this is a contemporary tendency driven by real estate speculation, and not by the actual community and historical heritage regeneration. To better represent and analyze the reality, the authors preferred not to account for

Definition of the Regeneration Projects
Three recently regenerated projects were selected for each typology. This decision was made considering a good balance between the need to provide a varied representation of the design approach (one or two cases per typology would not have been sufficient) and the need to have an in-depth analysis in terms of information useful for evaluating the project by the experts (a greater number of projects would have meant reducing the attention that the experts could provide analyzing the phenomena and, therefore it would have represented an incapacity to deeply analyze the projects).
Moreover, these projects have been selected from the panorama of local regeneration projects, excluding all those demolition and reconstruction of SLH that are oriented to the mere real estate market of selling houses in old-style buildings. Unfortunately, this is a contemporary tendency driven by real estate speculation, and not by the actual community and historical heritage regeneration. To better represent and analyze the reality, the authors preferred not to account for "striking" cases published in architecture magazines or projects considered as "best practices". On

Definition of the Regeneration Projects
Three recently regenerated projects were selected for each typology. This decision was made considering a good balance between the need to provide a varied representation of the design approach (one or two cases per typology would not have been sufficient) and the need to have an in-depth analysis in terms of information useful for evaluating the project by the experts (a greater number of projects would have meant reducing the attention that the experts could provide analyzing the phenomena and, therefore it would have represented an incapacity to deeply analyze the projects).
Moreover, these projects have been selected from the panorama of local regeneration projects, excluding all those demolition and reconstruction of SLH that are oriented to the mere real estate market of selling houses in old-style buildings. Unfortunately, this is a contemporary tendency driven by real estate speculation, and not by the actual community and historical heritage regeneration. To better represent and analyze the reality, the authors preferred not to account for "striking" cases published in architecture magazines or projects considered as "best practices". On the contrary, project selection considered these aspects: (1) consistency with the local tendency, which means that the projects reflect the features of other regeneration projects of the same typology; (2) reduced antiquity of the project; (3) abundant availability of material that describes the whole characteristics of the project. The first point, although introduces some bias specific to the authors, allows at the same time to reduce the number of projects necessary for the evaluation (as explained above) and to ensure that the results of the Expert Interview are as consistent as possible with reality. So, it should be noted how this selection, because of its methodological relevance, was the result of a long and deep process of reflection and study by the authors.
A narrative description of the projects is presented in Appendix A.

Choice of Existing Indicators to Study the Territorial Impact of Regeneration Projects
In order to guide the analysis of the projects and to be able to evaluate them, the authors decided to provide the experts with indicators that would highlight the two main aspects on which the research focuses: (1) the sustainability of the regeneration projects of the historical heritage and (2) the sustainability of the territorial impacts that characterizes these projects. Since the research does not aim to define new indicators, if not to evaluate the impact of these regenerative processes, the authors selected from the current academic literature two sets of indicators capable to guide the analysis and the study of these projects. So, to guide the experts in the evaluation, the following two sets of indicators have been considered: • sustainability of the regeneration projects of the historical heritage: Cultural Heritage Indicators (CHIs). For the indicators concerning the practice of urban-architectural regeneration, the indicators developed by F. Nocca in the article " The Role of Cultural Heritage in Sustainable Development: Multidimensional Indicators as Decision-Making Tool" [47] have been taken into consideration. These indicators, in fact, highlight the aspects that the research wants to analyze related to the historical heritage. The indicators, as presented by Nocca have been lightly modified accordingly: the impact category of "Cultural value of properties/landscape" mainly referring to the "number of well-preserved/in ruin buildings" and to the "State of conservation of heritage/landscape asset" were removed. Although the degree of preservation is central to our research, it is not significant as a variable to consider for the evaluation of experts because it was standardized through the project selection process made by the authors so that all projects could be evaluated starting from the same level of "State of conservation of heritage/landscape asset". To see the list of indicators that compose this category, please refer directly to the text of Nocca [47]. • sustainability of the territorial impacts: Sustainable Development Goals (SDGs). In order to assess the sustainability of the territorial impacts of each project, it was decided to take into consideration the SDGs that are valid internationally as a reference framework for the territorial development practices that want to reach defined sustainability objectives [48]. Based on some previous research developed by the authors [49] and for the relevance that only some goals have in territorial and social implications, it was decided to consider just some SDGs. According to the relevance of some specific SDGs for territorial and social implications, as defined by the previous studies [49,50], the SDGs presented in Figure 5 have been considered. Hence, with the research question in mind, the targets and sub-targets of the SDGs relevant to shared life and regeneration of abandonment of rural settlements as strategies for the development of sustainable territories are taken into account and described thematically in order to provide precise information to the experts for their evaluation. Thus, according to the methodology for SDGs selection designed by Henzler et al. [50], the SDGs' selection process was structured as follows: (1)

Expert Interview to Evaluate the Projects
Once typologies were defined, projects were selected and the appropriate sets of indicators identified, the actual organization of the Expert Interview was carried out. In agreement with what emerged in the study of academic literature on the subject (already introduced at the beginning of

Expert Interview to Evaluate the Projects
Once typologies were defined, projects were selected and the appropriate sets of indicators identified, the actual organization of the Expert Interview was carried out. In agreement with what emerged in the study of academic literature on the subject (already introduced at the beginning of this section) and with the aim of reaching a phase of fruitful discussion with the experts, the authors worked in defining two aspects: choosing the correct experts and creating the material to be provided to the experts to guide the activity.

Experts and Material Definition
Guided by the seminal book of Bogner, Litting, and Menz [38], it was possible to determine the required number, and as well as to make the right choice of experts.
They were selected from professionals, academics, and non-academics, whose work in the fields of territorial sustainability and regeneration of the built heritage was well recognized. According to comparisons with other research and considering the differences among the "four contexts", the number of experts needed for this activity was set at 11. The names and short background of the experts are included in Appendix B.
Moreover, the authors took care that the experts (1) came from the four studied geographic areas and (2) that they had a cultural knowledge of at least two cultures of each typology and as well as a basic knowledge of the four cultures under investigation, (3) they have not only academic knowledge but are active in community affairs of the context under investigation regardless of their position [38]. The reason was that their mixed expertise (as both an academic and active person in the context) can be considered socially institutionalized-as defined earlier-and linked to a specific context, even though in a different way from the expertise fully grounded on the academic role. This was the case for instance of Expert number 04, 06, 08, 09, and 11.
The initial phase of screening for the selection of a pool of potential experts had been done on the basis of the authors' academic network. By keeping in mind the three basic characteristics of the experts as earlier mentioned, we immediately realized potential limitations for the application of this methodology. In fact, we had found two possible groups of experts for which this difference might have affected the assessments; namely, in some cases, the careers of some scholars were not yet long enough to be considered extraordinary in terms of research abilities, though there was already evidence of some results achieved. This was the example of Expert number 07 and 10. Of course, the opposite case has also occurred, for example of high-level scholars who had made outstanding careers in the past but had concluded their activities because of retirement. This was the case of Expert number 03, 05, and 06. Nevertheless, for our objectives, some kinds of abilities are more important than the current research performance that can offer a distorted picture of the relevant knowledge of one expert.
Hence, given these numerous problems that could have led to an improper selection of experts, we used two main elements before to complete the expert selection as suggested again by Bogner, Litting, and Menz [38]: • Collecting standard discipline-scientific information about the scholars such as publications, citations, awards, memberships, and institutional and non-institutional engagement. These were all downloadable from Internet pages, the Web of Science, and other databases.

•
Supplementing the previous standard information with "other" kinds of information from the experts, such as for example, other research interests, public engagement, activism in association (i.e., ONG), members of citizens' groups, as well as volunteers in welfare, social work, and similar fields.
In the final phase, crosschecking all these data and screening, a pool of potential experts had been listed. Thus, each expert was contacted directly to confirm the willingness to participate. From this last operation, the final pool of experts has been designated in Appendix B.
In brief, the eleven experts represent a mixed group of insiders and outsiders with regards to the four contexts studied. Moreover, they are divided into high ranked scholars in their field of studies and young researchers with evidence of some results already achieved such as Expert number 07, 10, and 11. On the other hand, the expert group is composed of young scholars that are also active in community affairs of the context and senior scholars with a background of social volunteering and/or managerial direction of associations or public offices, such as for example the Experts number 04 and 08 and the Expert number 03, 05, and 06, respectively.
At the end of this delicate process, we can affirm that the final pool of the eleven selected experts was well balanced with regard to the above characteristics and quality as required for the experts' attributes in the scientific literature.
Meanwhile, as for the creation of the materials to be provided to the experts, a 60-page booklet was created collecting all the material necessary to carry out the activity. This booklet, which is not presented here for obvious reasons of spatial limitations, is available to everyone, at the following link (https://www.dropbox.com/s/tp6tuhetr9u8r8z/Expert%20Interview_booklet.pdf?dl=0) [46].
In the development of this article, however, various references are made to the contents of the booklet and some pages are presented as a template to show it as much as possible. This booklet is divided into four parts which present respectively: (1) objectives and methodology of the activity; (2) indicators to be used; (3) historical typologies; (4) projects to be analyzed.
• objectives and methodology of the activity: This section includes an introduction to the research rationale, the purpose of the expert's involvement, and the ways in which the research will be followed; • indicators to be used: This section introduces both schematic and discursive presentation of the indicators selected to guide the evaluation of the experts. In addition to the indicators punctually explained, bibliographic references are provided for voluntary insights. • historical typologies: In this section, each typology is presented through a textual description made by the authors. The goal is to make the experts confident with the typologies, also through various pictures and bibliographical references. • projects to be analyzed: In this section, each project is presented through a text prepared by the authors (annex A), some links (i.e., to the architects' web page) for detailed study, and some pictures.
Besides the booklet, experts received instructions on the next steps to be implemented. It is pleonastic to highlight that all the experts have already proved knowledge on this matter.

Expert Interview Operating Method
Once the Experts' list was defined and the material sent to them, the authors decided to operate according to the following phases:

1.
Site survey and first round of meetings: Site survey for the introduction to research and presentation of cases had been organized in September 2019 and January 2019 in China, Shanghai, and Milan, Italy, respectively. Authors and their research teams traveled and surveyed together numerous projects in China and in Lombardy, Italy, while another two field trips in Mexico and New Zealand were planned. Unfortunately, these last two field trips were not possible due to the COVID-19 pandemic outbreak, thus the local research teams completed this phase of the investigation. Regarding the experts' involvement despite the new circumstances generated by the pandemic and the differences in the geographical time-zone areas of the experts, telematic meetings were held using the Zoom platform. During these first meetings, the authors introduced the research to the experts, describing its objectives and methods, and presented the projects to avoid misunderstanding and to answer eventual questions. From these first meetings, some questions and considerations emerged, so to help the authors redefine the final questions, to which the experts would be asked to answer later. Some main considerations the experts shared were regarding the importance of the local context and the role of the local governments as well as the relevant differences among the four realities.

2.
Refinement of the questionnaire to be submitted to the experts: based on the observations that emerged, the authors refined the questions to be submitted to the interview of experts.

3.
Second round of meetings and Expert Interview: once the questions were completed on the basis of the experts' first observations, the final questionnaires were sent. For two weeks, the experts expressed their opinions supported by the questionnaire or during one-on-one meetings with the authors, who collected the answers within the same questionnaire. Due to differences in countries, the questionnaire was supported by a Google Form and by an Excel file. The answers were finally collected in a unique file that allowed the analysis and the development of the final results.
To summarize the whole process a figure of the flow of the activities carried out by the authors is illustrated in a simplified manner in Figure 7.
Sustainability 2020, 12, x FOR PEER REVIEW 14 of 28 experts expressed their opinions supported by the questionnaire or during one-on-one meetings with the authors, who collected the answers within the same questionnaire. Due to differences in countries, the questionnaire was supported by a Google Form and by an Excel file. The answers were finally collected in a unique file that allowed the analysis and the development of the final results.
To summarize the whole process a figure of the flow of the activities carried out by the authors is illustrated in a simplified manner in Figure 7.

Results
The results presented here are grouped in tables, as average values of the experts' answers. All the answers from the experts are available in Appendix C.
Tables 1 and 2 represent the average obtained by each typology, with reference to the chosen indicators sets: selected SDGs (Table 1) and CHIs ( Table 2). The authors asked the experts to evaluate according to a scale from 0 to 5, where 0 means that the characteristic specified by the indicator is totally absent and where 5 means that the indicator fully represents the characteristics of the project. The results will be discussed in detail later, with the support of graphical representation. However, from these tables, it is already possible to clearly highlight the attitude, common to all the four typologies, to be considered as a sustainable practice, even if the Hacienda's regenerative projects showed some delays compared to Tulou and Cascina.

Results
The results presented here are grouped in tables, as average values of the experts' answers. All the answers from the experts are available in Appendix C.
Tables 1 and 2 represent the average obtained by each typology, with reference to the chosen indicators sets: selected SDGs (Table 1) and CHIs ( Table 2). The authors asked the experts to evaluate according to a scale from 0 to 5, where 0 means that the characteristic specified by the indicator is totally absent and where 5 means that the indicator fully represents the characteristics of the project.
The results will be discussed in detail later, with the support of graphical representation. However, from these tables, it is already possible to clearly highlight the attitude, common to all the four typologies, to be considered as a sustainable practice, even if the Hacienda's regenerative projects showed some delays compared to Tulou and Cascina. With reference to the first data, it can be seen that the average valuation referring to the CHIs is much more uniform than those referring to the SDGs, even if some indicators move from this tendency: very low values emerge for the Chinese Real Estate. At the same time, very low values emerge for the Social Capital/cohesion and inclusion for the Mexican Hacienda.
By combining the four typologies in this table (Table 3), it appeared that the CHIs indicators had higher values and rarely deviate from the average. On the contrary, SDGs have differences in values and average values. Namely SDG 9 and SDG13 achieved the lowest values, SDG 11 the highest, and the SDG4, SDG8, SDG10, SDG12 did not deviate as much from the average nor from the disaggregated values. This preliminary observation of these simplified values was significant because it indicated which CHIs indicators and which SDGs the four regeneration projects contributed to more. Regarding the Cultural Heritage Indicators (CHI), it was interesting and also comforting to see the regeneration projects were more effective in terms of creative, cultural, and innovative activities (indicator 2), social capital/cohesion (indicator 5), and wellbeing (indicator 8). This was the same for the SDGs values, as they reveal that the SDG11 Sustainable Cities and Communities was the goal on which the regeneration projects contributed more to the four typologies. On the contrary, it was necessary to underline that the SDG9 Industry, Innovation and Infrastructure, and SDG13 Climate Action, were the two goals with the lowest values. This was due to the fact that in rural areas industry, innovation, and infrastructure along with climate actions were not yet fully considered central in the whole process of regeneration. It could be determined also by the fact that infrastructures, innovation as well as climate change actions are seen as in charge to the central government due to many reasons such as, for instance, the huge investments needed for infrastructural projects. This insight is already a preliminary validation of the need to define normative and superordinate design actions for sustainable development of territories (key design decisions) as it is discussed in the next section.

Graphical Representation of the Results
In order to highlight the aspects considered, the results of the Expert Interviews were represented in diagrams. Representations based on two types of diagrams have been chosen: • Cartesian diagram-individual projects located in a Cartesian plan defined by the dimensions of sustainability (SDGs) and regenerative approach (CHIs). Each project finds its place in the plan thanks to the coordinates given by the average values obtained in the Expert Interview for the categories of SDGs and CHIs. Additionally, the projects of each typology have been represented with the same color, so to allow to underline the behavior of the four typologies. Moreover, lines connect the points of the three projects, so to create an area, which will allow the authors to find additional characteristics and behaviors for each typology. This chart allows an overview of the performances of each project and typology related to their impacts on territories, in terms of sustainable development and regenerative approach.

•
Radar-the behavior of the four regenerated SLH typologies are represented on the basis of the values they reached for the two sets of indicators. Two diagrams have been created: one for the CHIs indicators and one for the SDGs. Unlike the previous diagram, both of these charts allow for highlighting the most important typology behaviors with respect to the single indicators, thus arriving at more detailed and deep observations.

Relation among Projects, Typologies, SDGs and CHI
This Cartesian Diagram shows the results of the four different typologies, highlighting how each one has its own characteristics in terms of territorial effects. The different arrangements in the plan and some common characteristics among the typologies allowed us to propose some relevant observations. By analyzing the diagram, for each typology can be highlighted in the following aspects: • Tulou (green): the three projects had limited difference in terms of results, highlighting that the regeneration projects of this type were clearly thought out according to the effects they must produce in the area. • Cascina (blue): similar to the Tulou projects, even those of the farmhouses had a fairly limited difference in terms of territorial results. This can be dictated by the fact that these projects usually have a fairly common goal or are limited by the characteristics of local regulations. • Hacienda (yellow): it was evident that two of the three projects have fairly low evaluations with reference to the SDGs. In particular, for some characteristics of projects that were mainly aimed at the private sector, no benefits of sustainable impact for the territory were highlighted. • Marae (red): even in the case of the Marae, the three projects were positioned quite far from each other, showing how the impacts on the territory were of different elements still alive in today's New Zealand society (it meant that the impacts they have on the territory can vary a lot).
In general, from the areas as they are presented in Figure 8 are defined by the connected points of each project per typology, we can read two main tendencies namely clustered tendencies, and spread tendencies: • clustered (Tulou and Cascina): the differences between the results were quite limited. This can be dictated by the fact that the projects were designed with a similar objective in terms of territorial impact and that in Italy and China there are quite restricted regulations or design codes that force the projects to have similar and basically good results. • spread (Hacienda and Marae): the variety of results between the projects depended on the fact that the buildings take on more varied functions so that they had different effects on the territory.
These tendencies showed how the regeneration projects of Tulou and Cascina had general common effects on sustainable territorial development. In these cases, the projects gave rise to fairly homogeneous (and sustainable) territorial effects. It would be interesting to analyze, in the subsequent development of the research to what factor this trend is due to the Italian legislative restrictions in terms of regeneration of the patrimony or to the strong Chinese government control.
On the contrary, the projects of Marae and Hacienda, with a wider area among the projects, presented a more varied effect on the territories, with results that were definitely less sustainable than Tulou and Cascina.

Relation among Typologies, and Single Indicators of SDGs and CHI
The results presented in this following Figure 9 are the averages of each typology, with the eight CHIs parameters and the seven SDGs taken into consideration. These radar charts allowed us to visually highlight some of the tendencies and characteristics of the regeneration projects for each typology. The most significant results are discussed below.

Relation among Typologies, and Single Indicators of SDGs and CHI
The results presented in this following Figure 9 are the averages of each typology, with the eight CHIs parameters and the seven SDGs taken into consideration. These radar charts allowed us to visually highlight some of the tendencies and characteristics of the regeneration projects for each typology. The most significant results are discussed below.

Relation among Typologies, and Single Indicators of SDGs and CHI
The results presented in this following Figure 9 are the averages of each typology, with the eight CHIs parameters and the seven SDGs taken into consideration. These radar charts allowed us to visually highlight some of the tendencies and characteristics of the regeneration projects for each typology. The most significant results are discussed below.  Observing the Cultural Heritage Indicators (CHI) radar, it can be highlighted that, in general, the typologies had relatively uniform behaviors. In fact, the lines overlapped for most of the circle. However, precisely this overlapping highlighted some relevant aspects. While Tulou (green), Cascina (blue), and Marae (red) had relatively low values for the first indicator of Tourism and Recreational Activities, the Hacienda (yellow) regeneration projects showed a clearly higher value, showing how the tourism sector was a strong impetus of regeneration in the Mexican context. On the contrary, it emerged quite visibly from the CHI radar that, at the same time, Hacienda and Marae show limited impact in terms of CHI indicator 5 "social capital". For the Hacienda, this aspect clearly confirmed how the impact of tourism in the social sector was still problematic and a not fully resolved issue. On the other hand, this low value for the Marae, which traditionally represented the symbol of the community itself, represented how, according to the experts, contemporary regeneration projects of Marae buildings have partially lost the ability to positively impact on social capital. This value indicated that both Haciendas and Maraes communities should implement social cohesion along with collaborative economy initiatives in order to improve their social capital in terms of physical and intangible capitals. Yet, this value was, at least, less impactful than the regeneration projects of the Cascina and Tulou.
Another specific aspect that emerged from the CHI radar was the indicator 6, "Real Estate", which was very irrelevant in the Tulou projects. This aspect can undoubtedly be related to the Chinese reality, where these kinds of projects are mainly managed and promoted by the government, who considers these interventions as opportunities to compensate the local population for the heavy influence that rural and urban development is impacting territories and societies.
There is, moreover, an interesting characteristic that deserves to be underlined for the regeneration projects of Cascina (blue). CHI indicator 3, which was related to Typical Local Production, highlighted how these projects were often indeed related to the initiatives for the production of goods and services, in total alignment with the original functions of the Cascina typology, and with the orientation provided by EU priorities through rural development programs.
On the other side, if we focus on the Sustainable Development Goals (SDG) radar, the situation was a little more multifaceted and could be immediately perceived by the separation between the four lines of typologies, which were more outdistanced than the CHIs lines. In the SDGs diagram, it emerged immediately that the yellow line of the Hacienda projects was almost always the most central line. That means it was the one that showed the least values for the SDGs, representing low sustainable impacts on the territories. In particular, this was evident for Goal 10-Reduced Inequalities (Indicator 4), which also refers to the aspect highlighted in the previous diagram of CHIs for indicator 5, Social Capital. This does not mean that the regeneration projects of Haciendas are not sustainable as a whole but it means that the efficiency in terms of social sustainability for the Hacienda regeneration projects needs to be implemented in terms of ability to positively impact on social capital.
Another relevant result showed in the SDGs radar was that the Cascina (blue) and Tulou (green) regeneration projects tend to show the best values, placing themselves almost always among the outermost lines. It is interesting to relate this observation with those coming from the CHIs' diagram: the projects of Cascina and Tulou had, respectively, similar outputs in terms of territorial impacts, and both had good results in terms of sustainable impacts, albeit the great existing economical, social, and governmental differences [51].
As for Marae (red), it had behavior quite similar to that of Cascina and Tulou, showing quite positive values in terms of sustainable impacts. However, it is interesting to highlight how the attitude of the Marae regeneration projects stands out regarding Goal 13-Climate Action (Indicator 7). This issue is very intriguing and opens up interesting reflections for future research, because the Marae, as a typology, is based on a strong relationship with the environment: the orientation towards orography and natural resources are the basis of this typology which, although rigid in its spatial organization, knows how to adapt very well to the natural context. It would be interesting, in fact, to study whether this traditional characteristic can influence even the contemporary regeneration projects so deeply that this feature can appear today as a positive impact on the territory, in terms of climate action. Moreover, next to this consideration, the attention of New Zealand regulations in terms of climate action can be considered as a relevant aspect.

Discussion and Conclusions
The research highlights several aspects that should be discussed, both in terms of methodology and contents.
In terms of methodology, this study offers numerous confirmations that the application of the Expert Interview methodology works well with this project. For instance, the validation of phenomena emerges in the well-known problematic relationship between tourism and social impact, and the role of the Chinese government in controlling regeneration initiatives among many others as earlier described. Furthermore, the scope of application for the expert interview method is much broader and deeper than many other research procedures. Even though it has been applied in several fields of studies, it has seldom been applied in architectural and urban studies research. Hence, with this paper, it is possible to affirm that this methodology can be fruitfully used as a self-sufficient method as well as in the architectural-urban studies with the aim to analyze and interpret contemporary phenomena of various territories. For example, it can be applied for the study of and to understand how the regeneration of ancient community buildings impact the sustainable development of the local context in terms of culture and identity. This method is effective in our research because it allowed collecting unknown and/or more reliable information/insight not so evident during our investigation. As to say, significant results can be achieved when authoritative opinions and professional estimations relating to the research are taken from persons whose competence is proved and not questioned. Due to the fact that respondents in the expert interviews are highly qualified in the investigated area, it often eliminates the need for additional verification procedures.
As Meuser, Nagel, and Libakova, and Sertakova [37,39] affirmed, the application of the expert interviews allows access to information that gives an opportunity to create a holistic view of the significance of SGDs and CHIs impact on the process of regeneration territories and shared-living buildings heritage.
In terms of content and related to the research question, this study reveals that the regeneration of historic community buildings often brings a change in the relationship with the context. From the state of introversion toward the landscape of these historical buildings, the regenerated buildings become extroverts, generators of social relationships, promoters of activities, and local life; in other words, sustainable regeneration of heritage allows to re-create a community. Thanks to these changes, this research shows how the urban-architectural regeneration of these historical typologies can be clearly associated with indications of sustainable development. In fact, these projects can be related to indicators of sustainable development for the territory, but in particular with the enhancement of architectural heritage. Of course, it is necessary to underline once more that there are differences between typologies. Some show more sustainable impact than others and some show more uniformity in the results. This opens up some more questions: the fact that some typologies i.e., Cascina and Tulou can be considered as "best practices" is due to the drivers of the context such as local laws, market, cultural sensibility, or characteristics typical of the typology? For Cascina and Tulou, does the fact that uniformity of results is associated with more sustainable practices mean that controlling results also lead to sustainable practices?
So, without any doubt, investments must be made in the recovery of the existing architectural heritage, in particular of that heritage which is characterized by being a symbol of local housing culture often associated with shared forms of living. These projects of Shared Living Heritage (SLH) continue to be an element of valorization of local communities and an actor promoting the sustainable development of territories.
To some extent, it is clear that normative and superordinate design actions need to be adopted for the sustainable development of territories without compromising the freedom of creativity and the use of natural resources and participation of local communities ( Figure 10). With this study, we also tried to demonstrate an approach to democratize the heritage regeneration process design approach and to preserve the identities of communities by, for example, looking at city development, real estate market, and sometimes the unavoidable slowness of local governments to cope with necessary changes. Thus, it is necessary to enhance the skills and awareness of communities in the field of sustainability, culture, and traditions in order to take into account during the design process the specific characteristics of ethnocultural groups for the regeneration and protection of communities from land use and the industrial development.
In the area of shared-living heritage, it is necessary to develop a series of measures so that the communities could foster and thrive their culture and products. By creating sustainable business opportunities through regeneration and being self-sustained, this will help to build a balance between governments top-down approaches and citizen bottom-up engagement. Alongside this, policymakers along with designers, citizens' representatives, and stakeholders need to create a "tailored" system of measures to encourage people to maintain and steward their cultural landscape respecting the land and biodiversity resources. Moreover, it is still necessary to provide sustainable perspectives in terms of living conditions, work opportunities, housing, services to the locals, engaging in innovative models of growth within traditional economic, and working activities. In this regard, new technologies, such as the internet of things, 5G telecommunication, new mobility models, new transportation services by drones and other devices, etc., are creating new opportunities for people, businesses, and society in remote places respecting traditional forms providing security in terms of natural and human resource safeguarding. In other words, it is necessary to cooperate to create resilient, sustainable, and prosperous communities.
Once these issues have been outlined by this work, the following steps for the research can be directed toward a better understanding of the reasons why some typologies have better and more uniform behavior in terms of territorial sustainability. A deeper analysis, able to support the definition of guidelines for governments, associations, entrepreneurs, and citizens can be relevant to understand how to realize (with public policies or design strategies) regenerative interventions, so as to improve and maximize the benefits in terms of sustainable impacts on territories.   With this study, we also tried to demonstrate an approach to democratize the heritage regeneration process design approach and to preserve the identities of communities by, for example, looking at city development, real estate market, and sometimes the unavoidable slowness of local governments to cope with necessary changes. Thus, it is necessary to enhance the skills and awareness of communities in the field of sustainability, culture, and traditions in order to take into account during the design process the specific characteristics of ethnocultural groups for the regeneration and protection of communities from land use and the industrial development.
In the area of shared-living heritage, it is necessary to develop a series of measures so that the communities could foster and thrive their culture and products. By creating sustainable business opportunities through regeneration and being self-sustained, this will help to build a balance between governments top-down approaches and citizen bottom-up engagement. Alongside this, policymakers along with designers, citizens' representatives, and stakeholders need to create a "tailored" system of measures to encourage people to maintain and steward their cultural landscape respecting the land and biodiversity resources. Moreover, it is still necessary to provide sustainable perspectives in terms of living conditions, work opportunities, housing, services to the locals, engaging in innovative models of growth within traditional economic, and working activities. In this regard, new technologies, such as the internet of things, 5G telecommunication, new mobility models, new transportation services by drones and other devices, etc., are creating new opportunities for people, businesses, and society in remote places respecting traditional forms providing security in terms of natural and human resource safeguarding. In other words, it is necessary to cooperate to create resilient, sustainable, and prosperous communities.
Once these issues have been outlined by this work, the following steps for the research can be directed toward a better understanding of the reasons why some typologies have better and more uniform behavior in terms of territorial sustainability. A deeper analysis, able to support the definition of guidelines for governments, associations, entrepreneurs, and citizens can be relevant to understand how to realize (with public policies or design strategies) regenerative interventions, so as to improve and maximize the benefits in terms of sustainable impacts on territories.

Appendix.A.3. Tulou
Tulou renovation project (2019); Fujian, China; Rural Urban Framework + University of Hong Kong: A collaboration between Rural Urban Framework and University of Hong Kong has given Tulou Zhenchunlou two buildings that provide the community with spaces for coexistence and recreation. Being Zhenchunlou, the first Tolou to appear in the village of Lantian, China, was abandoned for decades until the intervention by Rural Urban Framework. Made of wood, combining ancient and modern techniques, these structures, a tower and a trumpet, which is born in a first-level window and opens until it ends up resting in a patio, forming some bleachers. They have become part of daily life for the inhabitants of the community by developing activities such as study, coexistence, or the presentation of events.
School Bridge (2009); Fujian, China; Li Xiaodong Atelier: More than just satisfying the need to cross a river, this project pushes functionality to the limit by not only giving the community a connection between the two ends of a river, but also a school, a library and a store. It is also an attraction for the elderly and children to spend time on it. Located in the town of Hakka Xiashi, Fujian province in China, this project can become the key to revitalize this town that was facing aging and neglect of its inhabitants. An example of collaboration between designers and users to achieve a multi-functional project in harmony with its surroundings and its history.
Community-led design in China (2018); Fujian, China; AzuKo + Hello Shenzhen: five examples of participatory design projects. Cha'er Hutong Children's Library and Art Center in Beijing, Xihe Village Cooperative in Henan Province, Angdong Health Center in Hunan Province, and the Hada Village Water Community Center and Taoshu Tulou, both in Fujian province. These projects by Azuko (an architectural charity serving disadvantaged communities) show us a design led by the community for a humanitarian impact and the development of these communities. A design methodology, such as the one used, focused less on the economic and more on the human helps to achieve the objective of a local vision and appropriation of the project, taking into account the strengths of the community and disregarding its problems or differences, to achieve a solid project that meets the expectations of all participants and users.

Appendix.A.4. Marae
Te Noho Kotahitanga Marae (2012); Albert campus, New Zealand; Lyonel Grant: This Marae, located at the New Zealand University of Technology, is a spiritual place built in a sustainable way and combines the tradition with a contemporary environmental sensitivity. Its main function is to gather people for ceremonial services and celebrations, and also it is a repository of regional historical knowledge. This project is complemented by a dining room for 200 people. Since the concept, this project has shown the spirituality necessary for the functions it was designed for.
Tanatana Marae (2019); Waimana, New Zealand; Apa Architects: Project designed for a community with the ceremonial function of living in mourning for a deceased relative. This duel lasts three days and all his relatives accompany the body in this building that is complemented by another nearby construction in which the family's valuable objects are stored. It also has sustainable elements for water reuse, light sensors, thermal materials, and self-sufficient waste disposal. It has all the necessary services to become a space to remember the family member who has left, rest with him, and being with him in his last moments in this life.
Pehiáweri Marae (1980); Glenbervle, Whangarel, New Zealand; Ongoing regional regeneration project: This research project seeks to address the problem of homelessness for Maori people through the collaborative design together with the community, so they are involved in the entire design process. The project contemplates groups of houses of different characteristics with the necessary flexibility to allow community life and, at the same time, maintain the privacy of each family. Expert #10-Elisabetta Venco-PhD, Researcher/Assistant professor in urban planning and sustainability, Department of Civil Engineering and Architecture, University of Pavia, Italy. Dr. Venco is a young researcher with significant researches carried on methodological approaches to improve the development of the Rural-urban context focusing on urban approaches to analyze and enhance cultural heritages' contexts.
Expert #11-Caterina Pietra-PhD, Candidate in design, modeling, and simulation in engineering at the Department of Civil Engineering and Architecture, University of Pavia, Italy. Thanks to her study experience between China and Italy, in 2018 she got a Double Master Degree in Building Engineering and Architecture from Pavia University and Tongji University in Shanghai on the topic of "Heritage Conservation and Urban Regeneration in China". In 2019 she was a visiting researcher at the College of Design and Innovation of Tongji University. In Italy, she is involved in several citizens' groups' activities in rural areas of Lombardy.