District of Columbia Code Division VIII. General Laws. § 47-1042. National Guard Association;  lot 60, square 625.

The property situated in square 625 in the City of Washington, District of Columbia, described as lot 60, together with the improvements thereon, shall be exempt from all taxation so long as the property is owned by and titled in the name of the National Guard Association of the United States, a District of Columbia nonprofit corporation, is occupied by the Association, is used solely for purposes of the Association, and is not used for commercial purposes, subject to the provisions of §§ 47-1005, 47-1007, and 47-1009.  The transfer of the property to the National Guard Association of the United States shall be exempt from all transfer and recordation taxes of the District of Columbia.