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RT-4A 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 1.2. 1.5 for buildings containing less than 20 dwelling units, where at least 33% of these are "accessible."
Maximum building height 42 ft for buildings with less than 20 dwelling units, where at least 33% of these are "accessible." None for schools and churches.
Lot area per unit (density) 1,000 sq ft/dwelling unit, 1,000 sq ft/efficiency unit, 500 sq ft/SRO unit
Minimum lot area 1,650 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 buildings with under 20 dwelling units, of which at least 33% are "accessible": 50 ft or 24% of lot depth, whichever is less. For other buildings: 50 ft or 30% of lot depth, whichever is less.