AB 1751 Explained: California’s Missing Middle Townhome Ownership Act

General information only. This article is educational and is not legal, tax, financial, lending or investment advice. Do your own due diligence and confirm everything with your own qualified professionals before relying on it. Read the full disclaimer.

California has spent the last three years making it easier to build small numbers of for-sale homes on infill lots. SB 684 and SB 1123 created a ministerial path for up to ten fee-simple homes on a qualifying lot. AB 1751, the Missing Middle Townhome Ownership Act, applies the same idea to much larger projects: up to 150 townhomes, approved by staff without a hearing and without CEQA review.

Governor Newsom signed AB 1751 on September 29, 2026 (Chapter 781, Statutes of 2026). It takes effect January 1, 2027. This article covers what the law allows, which sites qualify, how it compares to SB 684, and why it matters for anyone building for-sale housing in Los Angeles.

What AB 1751 Does

AB 1751 creates a ministerial, by-right approval process for qualifying townhome development projects and the subdivision maps that go with them. If a project meets the law’s objective standards, the city must approve it. There is no discretionary hearing, no appeal, and no environmental review under CEQA, because the law states that an AB 1751 subdivision map is not a “project” under CEQA.

A city can deny a qualifying project only with written findings, supported by a preponderance of the evidence, that it would have a specific, adverse impact on public health or safety that cannot feasibly be mitigated. That is the same high bar the Housing Accountability Act uses. Projects run on the Permit Streamlining Act’s 60-day clock for ministerial approvals.

What Counts as a Townhome Project

The law defines a townhome as a single-family home of no more than three stories of occupiable space that shares a wall with its neighbor, or sits no farther from it than the minimum fire-separation distance in the Building Code. A qualifying project must meet all of the following:

Cities keep their objective zoning, subdivision and design standards, but only where those standards do not conflict with AB 1751. A city cannot apply a standard that would physically prevent the project from reaching its allowed density, and it cannot impose a rule only because a project uses the AB 1751 path.

Which Sites Qualify

AB 1751 applies to two kinds of land:

• Multifamily-zoned parcels, which is where most AB 1751 projects in Los Angeles are likely to land.
• Underutilized single-family-zoned parcels: lots with no permanent residential structure, or with only abandoned or uninhabitable ones.

New parcels must be served by a permitted community water system or a municipal sewer system, and lots outside urban areas must be bordered on three sides by developed parcels. The law also excludes a long list of sites:

• Sites in a high or very high fire hazard severity zone, which removes much of the Los Angeles hillside inventory.
• Prime farmland, wetlands, protected-species habitat and conservation land.
• Historic resources and parcels that contribute to a historic district.
• Sites with five or more existing homes, mobile home or RV parks, rent-controlled or covenant-restricted homes that would be demolished, or homes withdrawn under the Ellis Act within the past 15 years.
• Housing Element sites designated for lower-income units, and sites with a minimum density above 50 units per acre.
• Sites subject to SB 79, the 2025 transit-oriented upzoning law.

Flood zones, earthquake fault zones and sites with past contamination are not excluded outright but need the appropriate agency clearances. AB 1751 does not override the Coastal Act, so coastal permits still apply in the Coastal Zone, and it does not apply in San Francisco. Tribal consultation under Public Resources Code §21080.66(b) is required.

Fee-Simple Ownership, Without an HOA

The ownership rules are the part we care about most. AB 1751 lets each townhome sit on its own fee-simple lot of at least 600 square feet, with its own parcel number. Buyers finance those homes with ordinary mortgages and insure them with ordinary policies, which is not always true of condominiums and shared-ownership structures.

The law also permits common interest developments, limited-equity co-ops, community land trust models and tenancy in common, and it does not require a homeowners association. A city can require a road maintenance agreement for internal drives. Individual lots generally cannot be sold until each one has a finished home on it, with exceptions for common areas and the last undeveloped lot, and a city can waive that rule by ordinance.

How AB 1751 Compares to SB 684

The two laws now fit together. SB 684 is built for the small infill lot: four to ten homes on a site that used to hold one house or a small rental building. AB 1751 picks up where SB 684 stops, on larger multifamily-zoned sites that can hold more than ten homes, and keeps the same fee-simple, ministerial logic.

Why AB 1751 Matters for Development

• Entitlement becomes a schedule item. A traditional tract map for a 30-home townhome project runs through public hearings and CEQA, and either can stall it for years. A ministerial approval on a 60-day clock removes most of that risk.
• Costs are locked early. AB 1751 projects count as housing development projects under SB 330, so fees and applicable rules are fixed once a preliminary application is filed. Lenders and investors can underwrite a known cost structure.
• The product is cheaper to build. Two- and three-story wood-frame townhomes avoid the elevators, podiums and structured parking that make mid-rise condominiums expensive.
• Exits are conventional. Fee-simple homes sell to ordinary owner-occupant buyers using ordinary mortgages, one home at a time.
• Projects can be phased. A developer can build and sell in stages and adjust the pace to the market.
• Larger sites come into play. Sites that were too big for SB 684’s ten-home cap, and too politically exposed for a discretionary tract map, now have a by-right path.

What It Means in Los Angeles

The density floor matters most. AB 1751 requires at least 75 percent of the state default density for the jurisdiction. In Los Angeles County that default is generally 30 units per acre, so a project would need roughly 22.5 homes per acre or more. On a 7,500-square-foot lot, that works out to about four townhomes at minimum. On a half-acre site it is about eleven, which is also where the 10 percent affordability requirement begins.

The exclusions narrow the map. Hillside lots in very high fire hazard severity zones, Coastal Zone parcels that still need coastal permits, historic districts and sites covered by SB 79 will mostly be out. What remains is flat, multifamily-zoned infill, the same terrain where SB 684 projects already work.

How AB 1751 Fits Our Model

Assemble Capital was built around the Starter Home Revitalization Act: we acquire multifamily-zoned infill lots, entitle them ministerially, and build and sell fee-simple homes one at a time. Our current projects in Culver City are SB 684 projects.

As AB 1751 takes effect, part of our syndication model will be facilitating AB 1751 townhome projects where a site qualifies. When a site is larger than SB 684 allows, or the city’s zoning puts it outside the Starter Home Act, we will evaluate it under AB 1751 and structure the project the same way: fee-simple lots, no HOA where the site allows it, and homes sold individually to owner-occupants. The goal is the same as it has always been: more fee-simple, for-sale housing in Los Angeles, built on a predictable entitlement path.

Each project is still underwritten on its own merits. AB 1751 is new, cities have not yet published their procedures, and the first approvals will set the practical rules. We will share what we learn as those approvals come through.

Frequently Asked Questions

What is AB 1751?
AB 1751, the Missing Middle Townhome Ownership Act, is a 2026 California law that creates a ministerial, CEQA-exempt approval path for for-sale townhome projects of up to 150 homes. It was signed on September 29, 2026 (Chapter 781, Statutes of 2026) and takes effect January 1, 2027.

When does AB 1751 take effect?
January 1, 2027.

Can AB 1751 homes be sold as fee-simple lots?
Yes. Each townhome can sit on its own fee-simple lot of at least 600 square feet. The law also allows common interest developments, limited-equity cooperatives, community land trust models and tenancy in common, and it does not require a homeowners association.

How is AB 1751 different from SB 684?
SB 684 and SB 1123 cap a project at 10 homes. AB 1751 allows up to 150 townhomes, requires at least 75 percent of the state default density, and requires 10 percent of homes to be affordable on projects of 11 or more units. Both use ministerial approval with no CEQA review.

Does AB 1751 have an affordability requirement?
Projects of 11 or more homes must reserve at least 10 percent of units at affordable housing cost for lower-income households, secured by a 45-year covenant, or meet a stricter local inclusionary rule if one applies. Projects under 11 homes are exempt from that requirement.

Does AB 1751 apply in the Coastal Zone?
AB 1751 does not supersede the California Coastal Act, so coastal permitting still applies in the Coastal Zone. It also does not apply in San Francisco or on sites subject to SB 79.

Sources and Review

Provisions summarized from the bill text and history of AB 1751 (Chapter 781, Statutes of 2026), the Assembly committee analysis, and practitioner summaries published after signing by Holland & Knight and Brownstein. AB 1751 adds Government Code §65852.30 and a new chapter beginning at §66499.45. Cities will publish their own implementation procedures over 2027; confirm the current rules with the local agency before relying on them.

Related Reading

Keep Going.

Or see how this plays out in practice: SB 684/1123 Fee Simple Subdivisions.