As a large speculative office tower that maximized the built space for its plot, 100 Park Avenue set the trend for International Style construction in the following decades.
The most notable feature of the building was its bulk, exemplified by the 2,790 square meters floors of the 13-storey base, enabled by the introduction of effective illumination and air-conditioning for the deep interiors of the large base. The massing resulted in a total interior space of 76,700 square meters.
Above the base, the tower rises to a set-back top with illuminated numbers indicating the building's street number.
The new building replaced the Murray Hill Hotel (1883), but only after the hotel residents' resistance had led to delays and lengthy court battles.
The 36-storey building is built on an L-shaped plot, with the wing stepping back on the 40th Street side and the main mass rising on Park Avenue.
The facade has piers of white brick, with vertical stripes of glass and aluminium spandrels between.
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