The following commercial uses shall be permitted in an SP District as accessory uses and appropriate adjuncts to an apartment house or hotel, incidental to the uses permitted in this chapter; provided, that the requirements of §§ 502.2 through 502.4 shall be met:
There shall be no direct entrance to the commercial establishment from the outside of the building.
No part of the adjunct or the entrance to it shall be visible from a sidewalk.
No sign or display indicating the existence of the adjunct shall be visible from the outside of the building.
Mechanical amusement machines that are accessory to uses specified in §§ 502.1, 507, and 508, but in the case of § 502.1 only as to a hotel subject to the provisions of § 2501, shall be permitted as an accessory use incidental to the uses permitted in this chapter.
A child development home or an expanded child development home shall be permitted as an accessory use in an SP District incidental to the uses permitted in this chapter; provided:
Any other accessory use and accessory building customarily incidental to the uses otherwise authorized by this chapter shall be permitted in an SP District, except that a firearms retail sales establishment shall not be permitted as a principal or an accessory use.
D.C. Mun. Regs. tit. 11, r. 11-502