 In addition, a law for the creation of property for workers was passed, under which a married worker would normally keep up to 95% of his pay, and graded tax remission for married wage-earners applied up to a wage of 48,000 marks, which indicated the economic prosperity of West Germany at that time.The Town Planning Act (1971) encouraged the preservation of historical heritage and helped open up the way to the future of many German cities, while the Urban Renewal Act (1971) helped the states to restore their inner cities and to develop new neighbourhoods.In addition, Guidelines of December 1972 on the usage of federal funds in assisting social housing construction laid down that a certain standard needed to be observed when building homes for severely handicapped persons.