D.C. Mun. Regs. tit. 24, § 312
312.1 No portion of a sidewalk café, including, but not limited to, doors, windows, walls, or any other objects designed as part of a sidewalk café or placed within a sidewalk café, shall swing or project beyond the designated exterior perimeter of the sidewalk café; Provided, that this provision shall not apply to fire exit doors which are used exclusively as emergency fire exit doors.
312.2 All furnishings of the sidewalk café including, but not limited to, tables, chairs, and decorative accessories, shall be readily moveable.
312.3 The fixtures of a sidewalk café shall not be bolted or permanently affixed to public space, except that screw sockets may be permitted as a form of anchoring when approved by the Public Space Committee.
312.4 Any object to be affixed or attached to a wall or ceiling of a sidewalk shall be shown on the plan and approved by the Public Space Committee.
312.5 The floor of a sidewalk café shall be at the same elevation as the existing surface space, except as provided in § 312.6.
312.6 In order for the floor of the sidewalk café to be at level grade, the floor of the sidewalk café may be constructed so as not to exceed eighteen inches (18 in.) above the sidewalk where the sidewalk café meets with the adjoining clear sidewalk space.
SOURCE: Final Rulemaking published at 30 DCR 4346 (August 26, 1983).