Application of SIM Development, LLC, pursuant to 11 DCMR Subtitle X, Chapter 10, for variances from the non-conforming structure requirements of Subtitle C § 202, and the parking requirements of Subtitle C § 701.5, to add two stories containing sixteen units to an existing two-story, nine-unit mixed use building in the MU-4 at premises 1916 15th Street S.E. (Square 5766, Lot 845).