This book collects the best papers presented at a recent conference organized by SIEV (Italian Society of Appraisal and Valuation) to promote the interaction between Appraisal and Valuation and other social sciences to study the effects of migration on value and social, spatial and economic systems in a multicultural city. The book consists of seventeen papers in two parts. The first part, "Values and Relational Systems in Multicultural Societies", features how social sciences--including appraisal and valuation, urban planning, philosophy, psychology, and geography--take different approaches to studying values and relationships, converging to form a unified mosaic of complementary and interconnected knowledge. The second part, "Permeability and Permanence of Values in a Contemporary Multicultural City", highlights the most crucial topics on which appraisals and models focus to interpret and represent the influence of migration on the real estate market in different urban and territorial contexts, from historical centers, small towns, to tourist cities, also taking into account sustainability, maintenance and regeneration of cities.