Pursuant to 11 DCMR Subtitle X, Chapter 10, for variances from the off-street parking requirements of Subtitle C § 701.5, the alley lot height requirements of Subtitle E § 5102, the alley centerline setback requirements of Subtitle E § 5106, and the RF-use requirements of Subtitle U § 600.1(e), to construct a new three-story building and a new third-story rear addition to an existing building for residential uses in the RF-1 Zone at premises 1901, 1903, and 1905 9 1/2 Street, N.W. (Square 361, Lots 124-126).