In Germany, and particularly in Berlin, the fall of the Wall in 1989 and the years following reuni® cation were accompanied by a large in¯ ux of im migrants. Thesènew' m igrants in Berlin are added to the long-resident guestworker population in the western part of the city. This paper investigates the housing situation of the increasing population of foreigners before and after uni® cation as well as the changing segregation of ethnic minorities. After a comparison of the different housing systems in East and West Berlin and their consequences for ethnic segregation in the 1980s, the main elem ents of the housing transform ation since 1990 are identi® ed and related to the changing residential patterns of foreigners. The patterns of four selected nationalities with divergent migration motives are analysed in m ore detail. The paper draws attention to differences between East and W est Berlin as well as to recent convergences between the two parts of the city.