100 Park Avenue, ca. 1950.

This shiny glass tower was designed by Kahn & Jacobs in 1950 in the International style. As one of the first large office buildings constructed in New York after the Depression, the structure is astylar in ways that architects, up until that point, could not previously imagine.

Unlike prewar buildings which were drawn to be responsive to the environment, new advances in technology set this building apart. With the advent of central air-conditioning and fluorescent lighting, the tower was designed to emphasize floor space rather than airspace and light. Its ground floor alone is 40,000 feet, making it the prototype of the "block-through" office building in New York City.

In 2008, the property was redeveloped by Moed de Armas and Shannon and awarded "International Building of the Year" by the Building Owners and Managers Association (BOMA).