D.C. Mun. Regs. tit. 11-D, § 500
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500.1 The base zone development standards in Subtitle D, Chapter 2 shall apply to the R-1A/TS/NO zone except as specifically modified by this chapter. In the event of a conflict between the provisions of this chapter and other regulations of this title, the provisions of this chapter shall control.
500.2 In addition to the purposes of the R-1 zones, the purposes of the Tree and Slope Protection/Naval Observatory Residential House (R-1A/TS/NO) zone are to:
Zoning Regulations of 2016:
Residential House (R) Zones
(a) Promote the public health, safety, and general welfare on land adjacent to or in close proximity to the highly sensitive and historically important Naval Observatory in keeping with the goals and policies of the Federal and District elements of the Comprehensive Plan and the adopted Master Plan for that facility;
(b) Ensure that public land within the zone shall be used in a manner consistent with the historic or ceremonial importance and special missions of the Naval Observatory;
(c) Reflect the importance of the Naval Observatory to the District of Columbia and to the Nation;
(d) Protect Federal interest concerns, including the critical scientific mission performed at the Naval Observatory and the security needs of the Vice President's residence; and
(e) Reduce or eliminate any possible harm or restrictions on the mission of the Federal establishment within the zone.
SOURCE: Final Rulemaking published at 63 DCR 2447, 2834 (March 4, 2016 – Part 2); as amended by Final Rulemaking published at 70 DCR 011297 (August 25, 2023).