90 Church Street was designed by Cross & Cross, Pennington, Lewis & Mills and Louis A. Simon, who was Supervising Architect of the Department of the Treasury at the time. The architectural style of the building is a mixture of Neo-classicism and Art Deco. It has two towers and the facade is clad in limestone.
The building was completed in 1935, boasting the art deco style of its day.
It was added to the National Register of Historic Places by the City of New York in 1989. The building was extensively renovated by Boston Properties, Inc from the early 1990s though 2000 by Architects Swanke Hayden Connell Architects and Jung|Brannen Associates.
In addition to housing the Postal Service, the 90 Church Street building contains offices of the New York State Public Service Commission, the New York State Health Department, and the New York City Housing Authority.
The building suffered moderate damage during the September 11 attacks due to a remnant of one of the planes and other debris landing on top of the building. Following the collapse of the World Trade Centers twin towers, the building's facade was damaged, windows were broken, the roof was seriously burned and major water damage occurred throughout the internal structure. It was also extensively contaminated with asbestos, lead dust, fungi, fiberglass dust, mercury, and bacteria. The building was entirely engulfed by dust after the collapse of both buildings, respectively, and was further damaged when Building 7 collapsed later the same day. There was no major structural damage. During recovery efforts at Ground Zero, the United States Postal Service worked to return individual pieces of mail found by rescue workers to the addressees. In August 2004, the Church Street Station Post Office reopened, and mail was once again being processed there. Church Street Station also serves the 10007 ZIP code, covering portions of Battery Park City, TriBeCa, and the area surrounding New York City Hall.