Ordinance amending the San Francisco Planning Code by adding Sections 825, 825.1, 826, and 827 to create Downtown Residential (DTR) districts, establish DTR districts in Transbay and Rincon Hill, and specify the uses permitted in Downtown Residential districts; by adding Sections 145.4, 151.1, 152.2, 155.5, 166, 167, 175.7 and 263.19 to impose requirements for street frontages, permitted off-street parking and loading, allowed off-street freight loading and service vehicle spaces, bicycle parkin