Sacramento - Today, Senator Scott Wiener (D-San Francisco) announced SB 902, which authorizes two, three or four units of housing per parcel – depending on population – in neighborhoods zoned for lower density, such as single-family zoned areas. Additionally, SB 902 provides cities with a powerful new streamlining tool, if they choose to utilize it, to upzone non-sprawl areas to as many as 10 units per parcel.