Zoning designation
What Is R-4 Zoning? Medium-to-High Density Residential Districts Explained
What R-4 zoning usually allows, why it means mid-rise apartments in Los Angeles and detached houses in Baltimore, how New York, Anchorage, Phoenix, and Detroit define it, and what you can typically build.
R-4 is the district developers search for when they need real density without a rezoning. In most codes it allows mid-rise apartment buildings at higher density and height than R-3. In a few well-known codes it means something else entirely, so the label needs the city name next to it.
What R-4 usually allows
- Multifamily buildings, from walk-ups to mid-rise, at the district's density and height limits.
- Townhouses, two-family, and single-family dwellings, which are almost always still permitted.
- Group living, institutional, and civic uses, often conditionally.
- In some cities, limited ground-floor commercial or live-work.
What the code usually requires
- Density: units per acre or lot area per unit; R-4 commonly allows 25 to 60 units per acre, with some cities higher.
- Height: four to six stories in many suburban codes; mid-rise or more in large cities.
- Parking: one to one and a half spaces per unit, reduced near transit.
- Open space, setbacks, and step-downs next to lower-density districts.
How real cities define R-4
- Los Angeles: R4 is the Multiple Dwelling Zone above R3, allowing apartment buildings at a lot-area-per-unit standard that supports mid-rise development (Los Angeles Municipal Code section 12.11).
- New York City: R4 is a low-density district. It allows detached, semi-detached, and attached houses and small multifamily buildings at a floor area ratio of 0.75, with heights generally limited to about 35 feet, in outer-borough neighborhoods. R4-1, R4A, and R4B variants narrow the housing types further.
- Baltimore: R-4 is the Detached and Semi-Detached Residential District for lots of at least 3,000 square feet, a house district rather than an apartment district.
- Anchorage: R-4 is a multifamily district intended for medium-to-high density multifamily and multi-story residential buildings, while still allowing single-family, duplex, and townhouse development.
- Phoenix: R-4 is a Multi-Family Residence District near the top of the range, below R-4A and R-5. See our Phoenix zoning guide.
- Detroit: R4 is the Thoroughfare Residential District, multifamily along major streets. See our Detroit zoning guide.
The spread runs from a 35-foot house district to mid-rise apartments. The number tells you the district's position on that city's ladder, not an absolute density.
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What you can typically build
In the common version, apartment buildings of four to six stories or more, townhouse communities at higher density, and mixed residential projects. R-4 parcels are the by-right sites multifamily developers underwrite first, because the entitlement risk is low and the yield is set by arithmetic rather than a hearing. Our multifamily site selection guide explains how to turn a unit count into an acreage target and search for R-4 land.
How to check a specific parcel
Confirm the district on the city's official zoning map, then read the density and height standards in the code and check for overlays that step height down near single-family neighbors. In Plotzy, filter a market to R-4 and equivalent designations by lot size, and ask Zoning AI "What density and height does R-4 allow here, and is multifamily permitted by right?" for an answer with the section cited.
Frequently asked questions
What does R-4 zoning mean?
In most cities R-4 is a medium-to-high density multifamily residential district allowing apartment buildings by right. In New York City and Baltimore, R-4 is a low-density house district. The local code decides.
How tall can I build in R-4?
It depends on the city. Suburban codes often allow four to six stories; New York's R4 is limited to about 35 feet; large-city R-4 districts can allow mid-rise or more. Check the district's height standard and any overlay.
Is R-4 zoning good for apartments?
In most jurisdictions, yes. R-4 is typically the district where mid-density apartment development is permitted by right, which reduces entitlement risk.
What is the difference between R-3 and R-4?
R-4 generally allows more units per acre and taller buildings than R-3. See our R-3 explainer.
Related reading
- What Is R-3 Zoning? Low-to-Medium Density Multifamily Districts Explained
What R-3 zoning usually allows, the density, height, and parking rules that shape it, how Detroit, Phoenix, Los Angeles, and New York define it, and how developers use R-3 land.
- What Is Mixed-Use (MU) Zoning? Mixed-Use Districts and Properties Explained
What mixed-use zoning allows, how vertical and horizontal mixed-use differ, how Austin, Detroit, Miami, Phoenix, and Denver define their mixed-use districts, and what developers and investors can do with MU-zoned property.
- Multifamily Site Selection: Finding Land Zoned for Apartments by Right
Which districts allow multifamily by right, how density, height, and parking standards set your unit count, what recent state laws changed, and a parcel search recipe for apartment sites.