Download Complete OI Zoning Requirements Office-Institutional District Zoning Setbacks (as taken from the Zoning Ordinance) OI  Dimensional Requirements. Unless otherwise specified elsewhere in this ordinance, uses permitted in the OI Zoning District shall be required to conform to the following standards: Table 2.7 OI Dimensional Criteria Minimum Lot Area: Single Family: 8,000 square feet Two-Family: 10,000 square feet Minimum Lot Width:  Single Family: 50 feet @ the building line Two-Family: 60 feet @ the building line Setbacks: Minimum Front Setback: 30 feet* for local roads 40 feet* for collector roads Minimum Side Setback: 10 feet* for all residential uses 20 feet* for all other residential uses 15 feet* for non-residential uses Minimum Rear Setback: 15 feet* for all uses Maximum Impervious Surface Ratio 0.80 Maximum Residential Density (2) 14.0 Maximum F.A.R. (Non-Res. Only) 0.65 *(See General Supplementary Provisions).