 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.