In this period of increasing urbanization, cultural heritage can play a key role to achieve sustainable development, as widely recognized by international institutions (i.e., United Nations (UN), UN Educational, Scientific and Cultural Organization (UNESCO), International Council on Monuments and Sites (ICOMOS)). In this perspective, it is necessary to operationalize the principles stated at international level and thus new approaches and tools are required. The paper aims to understand the relationships between the implementation of adaptive reuse projects and their success (or not) in terms of impacts on the buildings themselves and on the urban context. The assessment framework for evaluating the impacts of heritage conservation and rehabilitation projects is described through the analysis and comparison of two Italian case studies: the Ancient Market and the Basilica of St. Peter the Apostle, in Siracusa (Italy). Although realized both in the same place (Ortigia, the historic centre of Siracusa), during the same period and by the same architect, these two interventions have produced different results in terms of urban development. A set of indicators, deduced from recent scientific studies, has been used to analyse the different impacts on physical, cultural, social, environmental and economic systems. To understand in depth the causes of these two different results, a survey has been carried out involving experts. The proposed indicators used for the ex-post evaluation can be also adopted in other contexts and for ex ante evaluation, in order to orient the strategic design choices in cultural heritage adaptive reuse projects.

Regeneration processes activate stable regimes of interaction and interdependence among the architectural, economic, cultural and social sub-systems in settlements. The thesis of this paper is that in order to progress towards sustainable and inclusive cities, urban governance should widen the decision-making arena, promoting virtuous circular dynamics based on knowledge transfer, strategic decision making and stakeholders’ engagement. The historic urban landscape is a privileged la b for this purpose. The paper adapts the Triple-Helix model of knowledge-industry-government relationships to interpret the unexpected regimes of interaction between Local Authority and Cultural Heritage Assets triggered in the late 90es by the establishment of a knowledge provider such as a Faculty of Architecture in the highly degraded heritage context of the city of Syracuse, Italy. Following this approach, the authors explain the urban regeneration happened over the last 20 years in the port city of Syracuse, based on knowledge sharing and resources’ protection that promoted processes of social engagement and institutional empowerment for both new residents and entrepreneurs.

Rehabilitation and management of pre-industrial architectural heritage over time has played a central role in the international scientific debate since the 1970s. In light of the experience gained in this field, the challenge of a controlled and consistent integration of Renewable Energy Sources (RES) requires a careful reflection on the compatibility criteria between new technologies and traditional building’s identity. Several of these technologies, such as photovoltaic (PV) systems, need to be placed on the building envelope or in appropriate outdoor areas, altering the architectural image and the landscape. Therefore, the characteristics of each building and its context should lead designers to choose solutions able to balance the need for increased energy production from RES with the need for preserving the identity of architectural heritage and landscape. A preliminary evaluation of rehabilitation projects allows to improve building sustainability and, in the meanwhile, to prevent any irreversible alteration of the cultural heritage. With reference to Italian case studies and guidelines for improving sustainability in energy production, the paper leads to identify evaluation criteria for the introduction of PV systems in pre-industrial buildings. Such criteria, which are based on architectural heritage values, allow for assessing the consistency of the building envelope alteration with conservation issues, in projects involving PV and, generally, solar technologies that need to be integrated with the building envelope.

Building reuse is a strategy for built heritage enhancement. The establishment of new activities in an existing building can have positive effects on the urban and territorial context and modify the dynamics of socio-economic development. If the reuse is considered as a cultural development strategy and not limited to a single building but to both buildings and infrastructures, these effects are amplified. This is the case of railway heritage, affected by an increasingly vast process of abandonment. The Italian policies for encouraging road transport and the communication models of the digital era have contributed to the gradual desertion of railway lines. This requires effective reuse models, to avoid that the Ferrovie dello Stato (State Railways) continue to carry the heavy burden of managing assets no longer able to generate income. The analysis of numerous station reuse cases, at an international level, lead to the selection of the case of the Postal Museum and Mail Ride in London as an example of good practice. The proposed methodology identifies a set of evaluation criteria and indicators to assess the effectiveness of adaptive reuse projects both in terms of their ability to protect built heritage identity and to modify the orientation of the territorial context’s development towards socio-economic sustainability guidelines.

The abandonment of the built heritage, as a result of functional or technological obsolescence or as a consequence of cultural, social, and economic trends, is steadily increasing. This great number of buildings, worldwide spread, offers a huge opportunity to reduce the environmental impacts related to the construction industry. Nonetheless, the recovery and reuse interventions that require the implementation of residual technological performance, to accommodate new uses, are not always environmentally neutral. Therefore, a new design approach needs to be developed so as to improve the buildings’ technological performance and enhance resources and energy already incorporated in buildings. The circular economy principles in the building sector, performance-based building design together with downcycling and upcycling theories are applied to develop a methodology aiming to reduce the environmental impacts within the rehabilitation and refurbishment design process. Starting from the building analysis phase (historical, material, construction) residual performance is evaluated; then the design phase demonstrates that, according to downcycling and upcycling design strategies applied on building components and materials, it is possible improving the building to the required new uses while minimizing transformations and effectively reducing related environmental impacts. The reduction of environmental impacts depends on a careful assessment of the residual technological and structural performance that the building still provides, by involving limited performance implementations to balance rehabilitation needs and environmental protection goals.