Accessory parking spaces elsewhere than on the same lot or part of the lot on which any principal SP use is permitted, except for a one-family dwelling, when the parking spaces will be established within the square in which the principal use is located, shall be permitted in an SP District if approved by the Board of Zoning Adjustment as a special exception under § 3104, subject to the provisions of this section.
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The total number of parking spaces provided for the principal use shall not exceed the minimum number of spaces required for the principal use.
It shall be considered economically impracticable or unsafe to locate the parking spaces within the principal building or on the same lot on which the building or use is permitted because of the following:
The parking spaces shall be located and all facilities in relation to the parking spaces shall be designed so that they are not likely to become objectionable to adjoining or nearby property because of noise, traffic, or other objectionable conditions.
D.C. Mun. Regs. tit. 11, r. 11-510