Kips Bay Towers, 1966.

The two towers of the Kips Bay Plaza Apartments were completed between 1960 and 1963. Designed by I.M. Pei and S. J. Kessler, the Brutalist style complex was erected on what had been the first Phipps Houses, a series of tenements created as working class housing just after the turn of the century. The two towers are massive 21-stories of glass and raw concrete facades. They were conceived as a middle-income rental project, but just 20 years later were converted to condominium apartments over the objections of a substantial number of residents.