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Housing Constraints Draft Housing Element 3-17 Density San Leandro’s Zoning Districts provide for a range of residential densities. The RS districts promote single-family development, and, with the implementation of SB 9, allows 2 units per lot and allows a lot split if lots have a minimum of 1200 square feet. Because 2 units are allowed on each lot, a lot split can occur and the original lot would permit 4 units. One ADU would also be permitted on each of the two lots. The RD district promotes single-family and duplex dwellings with up to two units per lot. The RM districts provide opportunities for multi-family development with densities ranging from 14.5 to 50 du/acre. The RO District also promotes single-family and duplex dwellings but allows more than 2 units depending on size of the lot. For example, for lots larger than 14,000 square feet, the number of additional dwellings permitted shall be based upon a requirement of 7,000 square feet for the first single dwelling, 5,000 square feet additional for each additional single-family dwelling, and 7,000 square feet additional for each additional two-family dwelling. The recent Multi-Family Development Standards project added the RM-875 District to be consistent with the High Density Residential land use designation and provide opportunity for multi-family housing with a maximum density of 50 du/acre. Lot Standards The minimum lot size requirement for residential lots in San Leandro is 5,000 square feet in RS and RD zoning districts. The minimum lot size increases to 8,000 square feet in the RO district and ranges from 6,000 to 10,000 square feet in the RM districts. The maximum site coverage requirement is 50 percent in single-family and duplex districts and ranges from 60 percent to 80 percent in the RM districts. Building setbacks depend on the zoning district. In residential districts, front building setbacks are generally 20 feet for RS and RD zoning districts and 15 feet in RM districts. Side setbacks range from 5 feet to 10 feet in RM districts. Rear setbacks are 15 feet except in the RO District, which ranges from 15 to 25 feet. Lot standards do not pose a potential constraint to development. Height Limits Height limits are generally intended to maintain consistency within an area and compatibility between adjacent buildings. The maximum height in RS and RD zoning districts is 30 feet. Maximum heights in the RM districts range from 40 feet to 50 feet, with 50 feet permitted in the RM-2000, RM 1800, and RM-875 districts and do not pose a constraint to development. Open Space Requirements Total open space on a site having three or more dwelling units in the RM districts must be at least 200 square feet per dwelling unit. Private open space meeting a portion of the requirement may be on patios or balconies within which a horizontal rectangle has no dimension less than 6 feet and a minimum area of 60 square feet for balconies above the first story and 120 square feet for patio or decks at grade level. Common open space, provided by non-street side yards, courts, patios, terraces, and rooftops must be designed so that a horizontal rectangle inscribed within it has no dimension less than 10 feet and a minimum area of 300 square feet, shall be open to the sky, and must not include driveways, pedestrian access to units, or parking areas, or area required for front or street side yards. The Board of Zoning Adjustments (BZA) may allow up to 30 percent of the total roof top open space provided to be used to satisfy the open space requirement. In a roundtable discussion hosted by the Alameda County Housing Collaborative on November 29, 2021, housing