D.C. Code § 10-604
The sum authorized by § 10-603, or any part thereof, shall, when borrowed, be available to the Mayor of the District of Columbia for the acquisition by dedication, purchase, or condemnation of the fee simple title to land, or rights or easements in land, for the public uses authorized by §§ 10-603 to 10-606, and for the preparation of plans, designs, estimates, models, and contracts, for architectural, and other necessary professional services, without reference to § 5 of Title 41, United States Code [see now 41 U.S.C. § 6101 ], for the construction of buildings, including materials and labor, heating, lighting, elevators, plumbing, landscaping, and all other appurtenances, and the purchase and installation of machinery, apparatus, and any and all other expenditures necessary for or incident to the complete construction of the aforesaid buildings and plants. All contracts, agreements, and proceedings in court for condemnation or otherwise, pursuant to §§ 10-603 to 10-606, shall be had and made in accordance with existing provisions of law, except as otherwise herein provided.
D.C. Code § 10-604