Abstract:The Hedonic Pricing Method is one of the principal assessment methods for evaluating services and resources not normally exchanged on the market. However, the method is often unable to account for the great variety of qualities in an urban context and faces scarce and heterogeneous market data. This paper presents a model for the valuation of benefits generated by environmental and urban improvement investments adopting a mixed hedonic-multi-attribute procedure for modeling a value function of urban real estate values. The peculiarity of the model is that the independent variables are aggregated indicators, which synthetize more detailed characteristics. Using the expertise of real estate agents, all relevant variables influencing real estate values were weighted and synthetized in a set of cardinal indicators. Next, market prices were used to calibrate a hedonic function that transforms the cardinal indicators into real estate values. The valuation model was integrated into a GIS for mapping the housing value, and its variation induced by urban investment. The proposed model pointed out plausible and robust results, in particular, the possibility to use any available information, such as location, position, technical and economic characteristics of buildings, and organize it in a flexible and transparent way, and to keep evident the role of each characteristic through the hierarchical structure of the model. The model was applied to the real estate market of Venice to test the effects of the MOSE project (Electromechanical Experimental Module) for the protection of Venice from high tides. The results of the application showed a relevant increase in real estate values in the center of Venice, especially related to property in ground floor units, of about 1.4 billion €.

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In the marginal areas of the Alps, there is a huge built heritage expressed by local communities, resulting in an architectural model that is sustainable in terms of its material use, resource exploitation, and landscape coherence. Although buildings in these small settlements have been largely protected from transformation, currently this heritage is largely underused. Thus, it is desirable to consider reuse and enhancement actions that can combine both economic viability and the protection of historic, cultural and architectural values. This paper presents a multi-attribute model for the evaluation of sustainability in reuse projects concerning traditional buildings in the Italian Alpine settlements. For the appraisal of sustainability, the model uses relevant parameters aggregated into three macro-indicators. The model was calibrated by an expert panel and tested on reuse projects in Sauris, in north-eastern Italy, where residential building type is characterized by specific techniques that are expressions of community traditions. The main results show that the attributes aggregation function is predominantly andness in all nodes. A short range in sustainability assessment is a predictable result, as the buildings used for the model’s application give a common judgment in some attributes. Finally, activities for widespread hospitality generate a greater expected return compared to commercial services.

Social housing constitutes a partial response to the demand for affordable housing. In Europe, there are different forms of social housing, which are distinguishable based on whether they employ a universal or residual approach. The latter is employed by Italian initiatives for social residential construction, the financial instrument of which is the Investment Fund for Housing, a closed-end fund managed by CDP (Cassa Depositi e Prestiti) Investment, which provides public–private partnerships. The main obstacle to the supply of low-cost houses is the high cost of building areas or, in other words, the high urban land rent. The value of building areas is particularly high in urban areas and in widespread settlement areas, for instance, in Northeastern Italy. The main objective of this paper is to identify the trade-off between urban land rent and housing affordability in a social housing intervention in Pordenone (Northeastern Italy). Four different scenarios are developed, the variables of which are: Cost of the area (urban rent), cost of construction works (quality of the buildings), and household income distribution. The results show that achieving the economic and social objectives of a social housing investment simultaneously is not possible in any of the scenarios evaluated. To allow the social groups most in need to access affordable housing would require a reduction of approximately 30% of the estimated cost of a building area.