Multifamily Site Selection: Finding Land Zoned for Apartments by Right

A multifamily developer knows the unit count that makes the deal work before they know the site. Zoning turns that number into a land search: the district sets the density, the height, the parking, and the lot area per unit, and those four numbers say how many acres you need and where. This guide explains how to read them, what has changed in the last few years, and how to search for parcels that already allow the project.

The short answer

Multifamily is permitted by right in multifamily residential districts (R-3, R-4, RM, MF, RH), most mixed-use districts (MU, MX, TOD), and many downtown and transit districts. It is conditional or capped in two-family and low-density districts (R-2) and, with a growing list of exceptions, prohibited in single-family districts (R-1). Start by listing the districts in your target municipalities whose density and height match your program, then search for parcels in those districts by size. Rezonings are possible; by-right sites close faster.

Which zoning districts allow multifamily

• Multifamily residential (R-3, R-4, R-5, RM-1 through RM-4, MF, RH): permitted by right, with density (units per acre or lot area per unit), height, and lot coverage limits that set the yield.
• Mixed-use (MU, MX, C-MX, TOD, "urban center"): usually permitted, often with ground-floor commercial requirements on certain streets and higher height limits than pure residential districts.
• Downtown and commercial corridors (CBD, C-2, C-3 in cities that allow residential above commercial): increasingly permitted; some cities allow residential in commercial districts outright, others only as mixed-use.
• Two-family and small-lot districts (R-2, RT): duplexes and townhouses by right; larger buildings conditional or prohibited.
• Single-family (R-1, RS, SF): historically prohibited. Reforms in several states and cities now allow two to four units on many single-family lots.
• Planned developments (PD, PUD): whatever the approved plan sets; often the largest by-right multifamily entitlements in suburban markets.

What the code usually requires

• Density: expressed as maximum dwelling units per acre, minimum lot area per unit, or a floor area ratio. This is the number that sets your yield.
• Height: stories or feet, often stepping down near single-family districts.
• Parking: spaces per unit or per bedroom. Several states and cities have cut or eliminated minimums near transit, which changes what fits on a site more than any other rule.
• Setbacks and open space: front, side, and rear setbacks, plus a percentage of the site as usable open space.
• Lot coverage and impervious surface limits.
• Design and compatibility standards: massing, facade articulation, and transitions to lower-density neighbors.
• Inclusionary or affordability requirements in some cities, sometimes paired with density bonuses.

What changed recently

Zoning for housing has moved faster in the last few years than in the previous thirty, and it moved in the developer's favor in many markets:

• Florida's Live Local Act (2023, amended 2024) requires local governments to allow multifamily and mixed-use residential on land zoned commercial, industrial, or mixed-use, without a rezoning, when at least 40 percent of the units are affordable to households at or below 120 percent of area median income, with height and density set by the highest allowed nearby. Check the current statute and your county's implementation; the details have been litigated and amended.
• State-level missing-middle laws: Oregon (House Bill 2001), California (SB 9 lot splits and duplexes), Washington (House Bill 1110), and others require cities to allow two to four units on many single-family lots.
• City reforms: Minneapolis, Austin (the HOME initiative allowing up to three units on single-family lots and smaller minimum lot sizes), and others rewrote single-family rules.
• Parking reform: Austin, Minneapolis, and a growing list of cities eliminated minimum parking requirements citywide; many states did so near transit.
• Colorado's 2024 housing laws on accessory dwelling units, minimum parking near transit, and transit-oriented communities.

These change which parcels qualify. A commercial corridor parcel in Florida may now be a by-right apartment site; a single-family lot in Austin may take three units. Always check the current code and any state preemption.

Site criteria beyond zoning

• Yield math: acres × allowed density, checked against height, parking, and open-space rules. A 4-acre R-4 parcel at 24 units per acre is 96 units before parking and setbacks; whether it is still 96 after them is the site plan.
• Utilities: sewer capacity is the constraint that surprises people most.
• Access and transit: driveway spacing on arterials, proximity to transit where parking minimums drop.
• Neighbors: single-family adjacency drives height step-downs and public opposition to any discretionary approval.
• School districts, retail, and employment within the trade area.
• Flood and environmental: FEMA zones and wetlands remove acreage from the yield.

How to search for multifamily sites in Plotzy

1. List the districts whose density and height match the program. Ask Zoning AI: "What is the maximum density and height in RM-3, and is multifamily permitted by right?"
2. Draw the submarket. Polygon or radius around the corridor, transit line, or employment center.
3. Filter by zoning. Sub-level designations for multifamily and mixed-use districts (Production), or the residential and mixed categories (Starter). In Florida, add the commercial and industrial designations that qualify under Live Local.
4. Filter by lot size. Convert your unit count to acres using the district's density, then search a range around it. Adjacent parcels that could be assembled count.
5. Filter by land use. Vacant, single-family on oversized lots in multifamily districts, obsolete retail on corridors, surface parking.
6. Rank the owners. Long tenure, entity ownership, out-of-area mailing addresses.
7. Save and contact. Folder, owner contact lookup, CSV export.

A worked example

Consider a broker in Colorado whose developer client needs roughly 80 units. Between the density and height in the multifamily districts of the municipalities on the client's list and the lot area per unit each one requires, the target is three to four acres in the districts that allow 20 to 30 units per acre by right. The broker searches those districts across a dozen municipalities in one pass, filters to three to five acres, and sorts by ownership tenure. The parcels at the top are vacant or under-built lots owned for fifteen years or more. A week of manual assessor-and-zoning-map work becomes an afternoon, and the calls start with "your parcel is zoned for what my client builds."

Common mistakes

• Sizing the site on density alone. Parking and open space, not units per acre, usually set the real yield.
• Assuming a mixed-use district is by right for pure residential. Some require ground-floor commercial on named streets.
• Ignoring state preemption laws that make more parcels eligible than the local map shows.
• Buying on a rezoning promise in a neighborhood that has defeated the last three.

Frequently asked questions

What zoning allows apartments?

Multifamily residential districts (commonly labeled R-3, R-4, RM, or MF), most mixed-use districts, and many downtown and transit districts allow apartments by right. Density, height, and parking rules in the district set how many units fit.

How do I find land zoned for multifamily?

Identify the districts in each municipality that permit multifamily at the density you need, then search parcels by those zoning designations and by lot size. Plotzy filters by sub-level zoning designation and lot size across 150M+ parcels and shows the owner of each match.

Can I build apartments on commercial land?

In many cities, yes: residential is allowed above or instead of commercial in general commercial and mixed-use districts. In Florida, the Live Local Act allows multifamily on commercial, industrial, and mixed-use zoned land when 40 percent of units are affordable, subject to the statute's conditions.

How many acres do you need for an apartment complex?

It depends on the district's density and height. At 20 units per acre, 100 units needs about five acres before parking and open space; at 60 units per acre in a mid-rise district, under two acres. Run the district's numbers before you search.

What is the difference between R-3 and R-4 zoning?

Both are typically multifamily districts, with R-4 allowing higher density or taller buildings than R-3. The exact meaning varies by municipality; see our explainers on R-3 and R-4.