Long kept away from real estate speculation, Berlin is no longer an exception among the major European metropolises. Rental and purchase prices are getting closer and closer to capitals like Paris. The reasons ? The lack of housing, too few new constructions and increased demographic pressure, notably with the reception of Ukrainian refugees. A development which also affects the social structures of the capital. Like the Franco-German kindergarten Kitaquarium forced to close its doors to make way for apartments sold on a piecemeal basis. Despite the mobilization of parents and children.