D.C. Code § 47-1094
The real property described as Lot 108 in Square 192 shall be exempt from real property taxation so long as the real property is owned by The Supreme Council (Mother Council of the World) of the Inspectors General Knights Commanders of the House of the Temple of Solomon of the Thirty-Third Degree of the Ancient and Accepted Scottish Rite of Free Masonry of the Southern Jurisdiction of the United States of America ("Supreme Council") or its subsidiaries, including the House of the Temple Historic Preservation Foundation, Inc., and is used by the Supreme Council or its subsidiaries to carry on their purposes and activities, and is not used for commercial purposes, subject to the provisions of §§ 47-1005, 47-1007, and 47-1009 as if the exemption had been granted administratively under this chapter.
D.C. Code § 47-1094