Pursuant to 11 DCMR § 3104.1 for a special exception under § 223, not meeting the lot area requirements under § 401, the lot occupancy requirements under § 403, the open court requirements under § 406, and the nonconforming structure requirements under § 2001.3, to allow the construction of a three-story rear addition to an existing single-family dwelling in the R-4 District at premises 940 14th Street S.E. (Square 1065, Lot 55).