Berlin Modernism Housing Estates (German: Siedlungen der Berliner Moderne) is a World Heritage Site designated in 2008, comprising six separate subsidized housing estates in Berlin. Dating mainly from the years of the Weimar Republic (1919–1933), when the city of Berlin was particularly progressive socially, politically and culturally, they are outstanding examples of the building reform movement that contributed to improving housing and living conditions for people with low incomes through innovative approaches to architecture and urban planning. The estates also provide exceptional examples of new urban and architectural typologies, featuring fresh design solutions, as well as technical and aesthetic innovations.