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RT-3.5 Residential Two-Flat, Townhouse and Multi-Unit District

Two-flats, townhouses, low-density apartment buildings, single family homes.


Specifications

Zoning Ordinance reference ยง 17-2-0103
Open the Chicago Zoning Ordinance (PDF)
Floor area ratio 1.05
Maximum building height 35 ft for detached house. None for schools and churches.
Lot area per unit (density) 1,250 sq ft
Minimum lot area 2,500 sq ft
On-site open space N/A

Setbacks

Front yard 15ft, or 12% of lot depth, whichever is less. Alternatively, setback can be the average front yard depth of nearest 2 lots.
Side Townhouses: complicated as hell, see 17-2-0500. All other buildings: Combined width of side setbacks must equal 20% of lot width, and neither setback can be less than 2 feet or 8% of lot width (whichever is greater.) But no setback is required to be wider than 5 feet.
Back yard For detached houses: 50 ft or 28% of lot depth, whichever is less. For buildings with under 20 dwelling units, of which at least 33% are "accessible": 50 ft or 24% of lot depth, whichever is less.