D.C. Code § 42-202.01

Whenever a recorded conservation easement has been registered with the Mayor, written consent of the holder of the registered and recorded conservation easement shall be required prior to the recordation of a subdivision by the Office of the Surveyor, and to the issuance of a permit for construction, demolition, alteration, or repair, except solely for interior work. With respect to the affected property, a conservation easement shall be deemed registered with the Mayor 10 days after proof of a recorded conservation easement is presented to the Historic Preservation Division of the Building and Land Regulation Administration, Department of Consumer and Regulatory Affairs.