The use of existing residential buildings and the land on which they are located by a nonprofit organization for the purposes of the nonprofit organization shall be permitted as a special exception in an R-1 District in the following instances if approved by the Board of Zoning Adjustment under § 3104, subject to the provisions of this section:
Use of existing residential buildings and land by a nonprofit organization shall not adversely affect the use of the neighboring properties.
The amount and arrangement of parking spaces shall be adequate and located to minimize traffic impact on the adjacent neighborhood.
No goods, chattel, wares, or merchandise shall be commercially created, exchanged, or sold in the residential buildings or on the land by a nonprofit organization, except for the sale of publications, materials, or other items related to the purposes of the nonprofit organization.
Any additions to the building or any major modifications to the exterior of the building or to the site shall require the prior approval of the Board. The Board shall refer any proposed additions or modifications to the State Historic Preservation Officer, who, acting with the advice of the D.C. Professional Review Committee for nominations to the National Register of Historic Places, shall provide the Board with a report to determine possible detrimental consequences that the proposed addition or modification may have on the architectural or historical significance of the building or site or district in which the building is located.
D.C. Mun. Regs. tit. 11, r. 11-217