Application of Christopher and Katelyn Kimber, pursuant to 11 DCMR Subtitle X, Chapter 9, for a special exception under Subtitle E § 5201 from the lot occupancy requirements of Subtitle E § 304.1, to construct a three-story rear addition to an existing, attached, principal dwelling unit in the RF-1 Zone at premises 1215 Carrollsburg Place SW. (Square 651, Lot 69).