36 C.F.R. § 910.13 Urban design of Washington, DC.
Title 36 - Parks, Forests, and Public Property
(a) Pennsylvania Avenue's unique role as the physical and symbolic link between the White House and the U.S. Capitol should be reinforced by new development along it. (b) To reinforce and enrich the legacy of the L'Enfant Plan, the primary function of new development in the Development Area is to define open spaces and plazas, or to reinforce vistas along major streets and thoroughfares.
Title 36: Parks, Forests, and Public Property
PART 910—GENERAL GUIDELINES AND UNIFORM STANDARDS FOR URBAN PLANNING AND DESIGN OF DEVELOPMENT WITHIN THE PENNSYLVANIA AVENUE DEVELOPMENT AREA
Subpart B—Urban Planning and Design Concerns
§ 910.13 Urban design of Washington, DC.