All the apartments were subject to rent laws, which barred any reduction in required services. In October 1984 a state court ruled that the parks were required services, which ended the matter. The battle, however, had led to a preservation campaign. On December 10, 1985, the New York City Landmarks Preservation Commission held a public hearing on the proposed designation of a Tudor City Historic District. On September 11, 1986, Tudor City was added to the National Register of Historic Places as a historic district, and the city historic district was officially designated on May 17, 1988.