If you own rental property in Los Angeles, the second half of 2025 brought two major policy shifts that deserve your full attention. The first is a countywide cooling ordinance that sets hard limits on indoor temperatures across rental units. The second is SB 1123, a new state law that quietly reshapes how vacant land can be developed across California.
Neither one is simple. And honestly, most apartment owners I talk to in neighborhoods like West Adams, Culver City, and Inglewood are just now starting to hear about them. So let’s break both down clearly.
The LA County Cooling Mandate: What It Is and Why It Matters
The Los Angeles County Board of Supervisors has been working on a mandatory cooling ordinance since early 2024. The final version is now moving through the approval process — and the timeline is moving faster than most landlords realize.
At its core, the ordinance requires rental property owners to maintain indoor temperatures at or below 82°F in all habitable rooms. Tenants must also be allowed to use portable cooling devices, meaning window AC units or portable air conditioners, without restriction from their landlord.
This is not a guideline. If adopted as written, this becomes a compliance requirement for rental units in Los Angeles County.
Here is what the current draft includes:
- 82°F Indoor Limit: Applies to all rooms where people live, sleep, or spend significant time.
- Portable Device Access: Tenants can bring in their own cooling equipment. Landlords cannot prohibit it.
- No Cost Pass-Through in Rent-Controlled Units: In rent-controlled unincorporated areas, landlords cannot pass retrofit or installation costs to tenants through rent increases.
- Small Landlord Phase-In: Owners with 10 or fewer units have until 2032 to comply — but only one room per unit needs to meet the standard during that period.
- Enforcement Begins January 1, 2027: County inspectors can respond to tenant complaints starting on that date.
Who Does This Actually Affect?
The ordinance was initially framed as applying only to unincorporated areas of LA County. But the way the language is currently written, incorporated cities could opt in — meaning this has the potential to affect rental properties across virtually the entire county.
If your building is in South LA, East LA, Compton, or any unincorporated pocket of the county, you are likely in the first wave. If you own property in incorporated cities like Burbank, Torrance, or Hawthorne, you may not be far behind.
The California Apartment Association and AAGLA are both urging property owners to contact their County Supervisors now — before the final draft is locked in.
There are still unanswered questions about how compliance will be measured, what documentation landlords need to maintain, and whether any funding assistance will be made available. These gaps are part of why industry groups are pushing to slow the process down and get clearer answers before adoption.
If you want to get involved, the County Supervisors’ contact page is available at bos.lacounty.gov.
What Should Los Angeles Landlords Do Right Now?
You do not need to panic — but you should start planning. Here are a few practical steps worth taking now:
- Assess your current units. Walk through your building and think honestly about how hot individual units get in summer. Buildings in the San Fernando Valley, Southeast LA, and the 110 Freeway corridor tend to run hotter than coastal properties.
- Document your existing systems. If you already have central AC, wall units, or mini-splits in place, document them. Compliance may be straightforward for some owners.
- Consult your multifamily broker or property manager. If you are already thinking about whether to hold or sell your Los Angeles apartment building, the coming compliance costs are an important part of that conversation.
- Stay engaged with landlord associations. AAGLA and the California Apartment Association are tracking this closely and are your best resource for updates.
SB 1123: A New Path for Small-Lot Development in California
While the cooling ordinance grabbed more local headlines, SB 1123 may have bigger long-term implications for the Los Angeles multifamily market. The law took effect July 1, 2025, and it allows developers to build up to 10 townhomes on qualifying vacant or uninhabitable single-family lots.
This is a meaningful change. For years, small infill development in LA has been constrained by zoning rules, lot minimums, and parking requirements. SB 1123 does not eliminate those challenges — but it creates a new pathway that some well-located parcels can actually use.
Key Rules Under SB 1123
- Vacant or Uninhabitable Lots Only: The property cannot have been used as a rental within the past five years. The developer is responsible for proving this.
- Minimum Lot Size: Parcels can be subdivided into segments as small as 1,200 square feet. On a typical Los Angeles lot, that realistically yields three to four townhomes after accounting for setbacks, parking, trash, and open space.
- Fire Zone Exclusions: Properties in Very High Fire Hazard Severity Zones are not eligible. This rules out many hillside areas across Silver Lake, Echo Park, Highland Park, and portions of the Eastside.
- Unit Size Cap: Each townhome can be no larger than 1,750 square feet. In LA, linkage fees kick in above 1,500 square feet, so many developers will build slightly smaller units to manage costs.
- Approval Timeline: Cities have 60 days to approve complete applications. Lot subdivision, however, typically takes nine to twelve months — though permitting can run in parallel.
- Utility Hookups Are a Wild Card: DWP requirements, including street transformer installations, can add a year or more to the final sign-off timeline. This is the piece most developers underestimate.
What This Means for Property Owners in Los Angeles
If you own a vacant lot or a teardown-ready single-family property that has not been rented in the past five years, SB 1123 could make your land meaningfully more valuable to developers. The demand for qualifying infill sites in well-located neighborhoods — think areas with transit access, walkability, and proximity to employment corridors — is real and growing.
That said, the early projects under this law are going to face learning curve delays. Cities and utility agencies are still figuring out their processes. Developers who move first may encounter inconsistency, slower approvals, and more back-and-forth than the law intends. This is not a reason to avoid the conversation — but it is a reason to work with experienced people who know how to navigate it.
For long-term owners who have been holding onto underperforming or vacant parcels in neighborhoods like Florence-Graham, West Athens, or the South Bay cities, now is a good time to revisit your options.
Not every parcel qualifies under SB 1123, but the ones that do have a genuinely expanded buyer pool — and that affects your valuation.
How These Two Changes Connect
At first glance, a cooling mandate and a development law seem like unrelated topics. But for Los Angeles apartment owners and investors, they are part of the same larger picture.
On one side, the regulatory environment continues to add compliance costs to existing rental properties. The cooling ordinance, combined with the already-adopted all-electric appliance mandate, means that owning and operating multifamily buildings in LA is getting more expensive. Owners who have been holding properties for 10, 15, or 20 years are taking a hard look at whether continued ownership makes financial sense — especially in rent-controlled buildings where income growth is limited.
On the other side, SB 1123 and laws like SB 1211 (which allows additional ADUs on existing multifamily parcels) are expanding the development potential of certain properties. Investors who understand these laws are actively looking for buildings and lots that qualify — and they are willing to pay for the opportunity.
If you are a Los Angeles apartment owner trying to figure out what all of this means for your specific situation, that is exactly the kind of question worth sitting down and working through carefully.
Final Thoughts
Los Angeles has always been a complex market to own rental property in. Between rent control, eviction protections, and now new environmental mandates, the rules keep shifting — and keeping up requires real attention.
The cooling ordinance is not finalized yet, which means there is still an opportunity to influence the outcome. SB 1123 is already law, which means the opportunity is in identifying how it applies to your holdings and your neighborhood.
Whether you are considering selling your Los Angeles apartment building, exploring a 1031 exchange, or just trying to understand how these changes affect your portfolio’s value, I am happy to walk through it with you.
Reach out for a free property valuation or just a straightforward conversation about where things stand in your area of LA. No pressure — just information you can actually use.
Frequently Asked Questions
When does the LA County cooling ordinance take effect?
Enforcement through county inspectors is scheduled to begin January 1, 2027. However, the ordinance is still moving through the final approval process, so the specifics, including which properties are covered, may change before adoption.
Does the cooling mandate apply to my building in the City of LA?
The current draft of the ordinance targets unincorporated areas of LA County first. However, the language is broad enough that incorporated cities could opt in. It is worth monitoring, regardless of where your property is located.
Can I pass the cost of HVAC upgrades to my tenants?
In rent-controlled unincorporated areas, the answer under the current draft is no. The ordinance explicitly prohibits cost pass-through for retrofit and installation expenses in those units. For properties outside rent control, the rules are less clear and still being worked out.
Does SB 1123 apply to my apartment building?
SB 1123 applies to vacant or uninhabitable single-family lots, not to existing multifamily buildings. If you own a vacant parcel or a property you are considering demolishing, it may be worth exploring whether it qualifies. If you own an existing operating apartment building, SB 1211 — the ADU expansion law — is the more relevant legislation for you.
Should I sell my Los Angeles rental property because of these new laws?
That depends entirely on your property, your financial goals, and your timeline. These regulatory changes are real factors in that decision, but they are not automatic reasons to sell. The right answer is different for every owner. If you are asking the question seriously, it is worth getting a current valuation and talking through the numbers with someone who knows the LA multifamily market.
— Evelyn Baez Nguyen is a multifamily investment specialist at Lyon Stahl Investment Real Estate, serving apartment owners and investors across Los Angeles County.
