The New York City Landmarks Preservation Commission designated the building a landmark in 1966, and it was listed on the National Register of Historic Places in 1972. In 1974, Wank Adams Slavin was hired to undertake a $24 million renovation of the building's interior. As part of the renovation, corridors were narrowed and partitions between offices were removed to create more office space; vinyl floor tiles and recessed lighting were installed; and the outdated plumbing system was replaced. The project increased interior capacity to 6,500 employees. During this time, "Civic Fame" was also renovated. The building had been cleaned by 1975 at a cost of $300,000, though more funds for the renovation had also been appropriated.