Shopping centers, large stores, and retail storefronts, often along major streets. Allows more types of businesses than B1 and B2 districts. Apartments permitted above the ground floor.
| Zoning Ordinance reference |
ยง 17-3-0104 View the Chicago Zoning Ordinance |
| Floor area ratio | 5 |
| Maximum building height | Varies by lot frontage, and whether building has ground-floor commercial space. (See 17-3-0408) |
| Lot area per unit (density) | 200 sq ft/dwelling unit, 135 sq ft/efficiency unit, 100 sq ft/SRO unit |
| Minimum lot area | |
| On-site open space | N/A |
| Front yard | None, unless property borders an R-zoned lot. Then the front setback must be at least 50% of the R lot's front setback. (See 17-3-0404.) |
| Side | None, unless property borders an R-zoned lot. Then the R lot's front setback applies. |
| Back yard | If property has dwelling units, minimum of 30 ft. If its rear property line borders the side property line of an R-zoned lot, the rear setback must equal the side setback of the R-zoned lot. If rear line borders the R lot's rear line, setback must be at least 16 ft. |