Located at 65 Mitchell Place/35 South Broadway, the building was built to serve as a National Guard armory.

[2] The building was 31,612 square feet and takes up three-quarters of an acre.

[2] From April 1924 to November 1929, the White Plains Armory was the temporary headquarters of Troop K of the New York State Police, after a March 3, 1924 fire destroyed the troop's headquarters at Gedney Farms.

[3] The police troop left the Armory in November 1929 after a new headquarters in Hawthorne was completed.

[2] It is located on the site of the first courthouse where the Declaration of Independence was read on July 11, 1776.