Request pursuant to 11 DCMR § 3104.1 for a special exception under § 223, not meeting the lot occupancy requirements under § 403.2, the rear yard requirements under § 404.1, the open court requirements under § 406.1, and the nonconforming structure requirements under § 2001.3, to allow the construction of a two-story rear addition to an existing single-family dwelling in the R-4 District at premises 815 8th Street, N.E. (Square 911, Lot 73).