Beekman's Mansion Small 320×221 Medium 640×441 Large 1024×706 Download Tiff Original 2400×1655 | (1.2 MB) Description The Beekman Mansion was built over the course of two years, from 1802 to 1804, for the family of William Beekman. Keywords house, mansion, New York City, William Beekman Galleries Housing, New York Source: Benson John Lossing, ed. Harper's Encyclopedia of United States History (vol. 6) (New York, NY: Harper and Brothers, 1912)