Pursuant to 11 DCMR §§ 3104.1 and 3103.2. for a variance from the lot occupancy requirements under § 772, a variance from the rear yard requirements under § 774, a variance from the off-street parking requirements under § 2102.1, and a special exception to allow roof structure with walls of unequal heights under § 411.11, to allow an addition to an addition to an existing building in the DD/C-2-C District at premises 704 3rd Street, N.W. (Square 529, Lots 802, 803, 845, and 847).