A parking lot in any district shall conform to the following provisions:
In addition to the requirements of § 2303.1, a parking lot located in an R-1, R-2, R-3, R-4 or R-5-A District, and a parking lot located in any other district where such parking lot is contiguous to an R-1, R-2, R-3, R-4, or R-5-A District, shall be screened from all contiguous residential property located in the R-1, R-2, R-3, R-4, or R-5-A District by a solid brick or stone wall at least twelve inches (12 in.) thick and forty-two inches (42 in.) high or by evergreen hedges or evergreen trees that are thickly planted and maintained and at least forty-two inches (42 in.) in height when planted.
If approved by the Board of Zoning Adjustment as a special exception under § 3104, the conditions in § 2303.2 may be waived or modified.
Before authorizing a waiver or modification, the Board shall consider:
The Board may require any special treatment of the premises that it deems necessary to protect the value of adjacent property.
D.C. Mun. Regs. tit. 11, r. 11-2303