Use permissions for the R-16 zone are as specified for Use Group D in Subtitle U, Chapter 2.
An expansion of an existing non-residential use shall not exceed ten percent (10%) of its gross floor area of the building the use occupies subject to the conditions of Subtitle U §204. A proposed expansion of an existing non-residential use in excess of ten percent (10%) of its gross floor area, shall be subject to the conditions of Subtitle U §205.
D.C. Mun. Regs. tit. 11, r. 11-D910