houses whose ceiling had been adapted to increased expenses or incomes (1970). 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 disabled persons. The Second Housing Allowance Law of December 1970 simplified the administration of housing allowances and extended entitlements, increased the income limit to 9,600 DM per year plus 2,400 DM for each family member, raised the general deduction on income to determine reckonable income from 15% to 20%, allowance rates listed in tables replacing complicated calculation procedure based on "bearable rent burdens". The Housing Construction Modification Law (1971) increased the income-limit for access to low rent apartments under the social housing programme from 9,000 DM to 12,000 DM per annum plus 3,000 DM (instead of 2,400) for each family member. The law also introduced special subsidies to reduce the debt burden for builders not surpassing the regular income-limit by more than 40%. Under a 1973 law, the limits were increased to 1,000 DM plus 9,000 DM and 4,200 DM for additional family members. The Rent Improvement Law (1971) strengthened the position of tenants. Under this legislation, notice was to be ruled illegal "where appropriate substitute accommodation not available; landlords obliged to specify reasons for notice", whilst the Eviction Protection Law (1971) established tenant protection against rent rises and notice. The notice was only lawful if in the "justified interest of the landlord". Under this law, higher rents were not recognised as "justified interest". The Second Eviction Protection Law (1972) made the tenant protection introduced under the Eviction Protection Law of 1971 permanent. Under this new law, the notice was only lawful where the landlord proved justified personal interest in the apartment. In addition, rent increases were only lawful if