D.C. Code § 10-1202.24

Notwithstanding any other provision of law, the Mayor may issue a permit or airspace lease to Marriott International, Inc., or its designee, for vault space or airspace adjacent to the real property subject to the leases authorized by §§ 10-1202.22 and 10-1202.23, having a term not to exceed 99 years, or such longer period as may be otherwise determined by the Mayor, and at no additional rent or fee, except as may be otherwise determined by the Mayor, but otherwise in accordance with subchapters I and II of Chapter 11 of this title [§ 10-1101.01 et seq. and § 10-1121.01 et seq.], as applicable. The recording of any airspace lease executed pursuant to this section among the land records of the District of Columbia shall be exempt from the recordation tax imposed by § 42-1103.