Saint Paul Zoning Codes Explained: RT1, RT2, RM, and What They Allow
Saint Paul and Minneapolis sit 10 miles apart and share a metro, but their zoning codes are entirely different systems. A lot of developers and investors who know Minneapolis zoning cold don't know Saint Paul at all — or they're working from an outdated understanding of a code that's changed significantly in recent years.
Saint Paul has been quietly reforming its zoning to allow substantially more housing density citywide. If you're doing residential development or evaluating investment properties in Saint Paul, here's what the current system looks like.
The Recent Changes
In 2022 and 2023, Saint Paul adopted sweeping changes to its residential zoning as part of its housing policy response to the state's housing shortage. The core change: Saint Paul now allows triplexes and fourplexes on most residential lots citywide, regardless of the existing zone.
This is the Saint Paul version of what Minneapolis did with the 2040 Plan. The practical effect is similar — a lot of properties that were effectively capped at one or two units can now support three or four by right.
The specific zoning codes still matter for projects above that threshold — what you can build at 5+ units depends heavily on your zone. Here's how the main categories break down.
Single-Family and Low-Density Residential
R1 — Very Low Density Residential The most restrictive residential zone. Single-family homes on large lots (minimum lot size around 10,000 sq ft). Found in the low-density areas of Saint Paul's western and northern edges. Triplexes and fourplexes are now allowed here under the citywide housing changes, but the large lot requirement limits density math.
R2 — Low Density Residential Standard single-family neighborhood zone, with a smaller minimum lot size (~6,000 sq ft). Covers most of Saint Paul's traditional residential neighborhoods. Same story — allows up to fourplex by right now.
R3 — Low-Medium Density Residential Duplexes and small multi-unit buildings have been the norm here. With the recent changes, R3 is increasingly where you see 4–6 unit infill projects. Many parcels in older Saint Paul neighborhoods like Dayton's Bluff, Payne-Phalen, and parts of the East Side fall in R3.
Medium and Higher Density Residential
RT1 — Low Density Townhouse Residential Designed for attached and townhouse-style housing. Allows rowhouses, townhomes, and small multifamily. RT1 is common along transitional corridors and in areas near commercial nodes. It's where Saint Paul concentrates planned attached housing development.
RT2 — Medium Density Townhouse and Apartment Residential Steps up in density and building type flexibility. RT2 allows small to mid-size apartment buildings in addition to townhouses and attached units. In my experience evaluating Saint Paul parcels, RT2 near transit (the Green Line, bus rapid transit corridors) is the most interesting zone for 8–20 unit projects.
RM1 — Low Density Multiple-Family Residential Apartment buildings up to roughly 3–4 stories. RM1 covers a significant portion of Saint Paul's denser residential areas — Summit Hill, Cathedral Hill, Mac-Groveland. These neighborhoods have strong renter demand and RM1 parcels with underutilized or vacant lots are worth watching.
RM2 — Medium Density Multiple-Family Residential Mid-rise scale residential. 4–6 story apartment buildings. RM2 concentrates along the major arterials and near downtown Saint Paul. Development here requires more capital but the entitlement supports serious density.
RM3 — High Density Multiple-Family Residential High-density residential with minimal restrictions on unit count or height. Relatively rare and clustered near downtown, the Capitol area, and along the Green Line. RM3 parcels don't come up often, but when they do the development potential is substantial.
Commercial and Mixed-Use Zones
Saint Paul's commercial zones are layered with residential allowances, similar to Minneapolis's CC and BFC system.
B1 / B2 / B3 — Neighborhood, community, and general business districts. B2 and B3 along the main commercial streets (University Ave, Payne Ave, Robert Street, Grand Ave) allow residential above ground-floor commercial. The Green Line corridor on University Ave is almost entirely B3 with significant RM overlays.
B4 — Central Business District — Downtown Saint Paul. Maximum density, mixed uses, complex permitting environment.
T1–T3 (Traditional Neighborhood Business) — Designed for the walkable commercial corridors Saint Paul built before zoning existed. More permissive for small-scale mixed use. Found along Grand Ave, Selby Ave, Marshall Ave, and similar streets.
How Saint Paul Differs from Minneapolis
A few key operational differences if you're switching between cities:
Permit review: Saint Paul's building permit review runs through the Department of Safety and Inspections (DSI). For most small-scale residential projects, turnaround is 4–8 weeks, similar to Minneapolis. Larger projects go through a longer design review process.
Neighborhood districts: Saint Paul has 17 designated neighborhood districts with active organizations. Unlike Minneapolis, Saint Paul neighborhood organizations don't have formal authority over by-right projects, but they're more active politically than in most cities. Understanding the local neighborhood context matters.
Historic districts: Saint Paul has more and more strictly enforced historic districts than Minneapolis. Summit Avenue, Irvine Park, and several other areas have design review requirements that add time and cost to projects touching existing structures. Check before you plan a significant exterior modification.
Parcel data: Saint Paul parcels fall under Ramsey County's data system rather than Hennepin County. The parcel IDs, ownership records, and assessed values are maintained separately. ParcelLens covers both counties — you can look up any Saint Paul address and see the current zoning code, lot size, assessed value, and permit history in one place.
What to Check Before Evaluating a Saint Paul Property
The Saint Paul zoning code is publicly available and has a good online search interface, but getting to the parcel-level detail — actual lot size, property classification, current assessed value — requires cross-referencing the county parcel data.
My typical workflow for a Saint Paul parcel:
- Look up the address on ParcelLens to get lot size, year built, property class, and assessed value
- Check the zoning code (shows on the ParcelLens report for Saint Paul properties covered by city zoning data)
- Cross-reference with the city's zoning map for precise boundaries if the parcel is near a zone line
- Pull permit history to see what's been done on the property and whether there are any open violations
The recent changes to allow triplexes and fourplexes citywide create a lot of opportunity in neighborhoods where the land basis is still priced for single-family use. That arbitrage exists in Saint Paul just as it did in Minneapolis post-2040 — but most of the attention has focused on Minneapolis, which means Saint Paul is often less picked-over.
Jacob Stern has developed residential properties across Minneapolis, Saint Paul, and the inner-ring suburbs since 2013. He co-founded ParcelLens to provide free, fast access to parcel data and zoning records for both Hennepin and Ramsey County properties.
Jacob has spent 13 years developing residential and commercial properties across the Twin Cities. He's worked on everything from single-family infill in South Minneapolis to mixed-use projects in Saint Paul's Lowertown. He built ParcelLens to replace the stack of county websites, PDFs, and spreadsheets he used on every deal.
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