Every multifamily deal in Los Angeles in 2026 fails one of three tests, and most buyers are running all three wrong. The first is whether the rent roll is real. The second is whether the operating expense number reflects what the building actually costs to run. The third is whether the cap rate you are paying accounts for the rent control regime your building sits under. Get all three right and the math works. Miss one and the building owns you for the next seven years.
This guide is for the investor analyzing deals. It is not exhaustive — entire books exist on multifamily underwriting. It is the specific parts that trip LA buyers in 2026.
A rent roll shows in-place rents as of a specific date. The listing package version is typically clean. The operator's actual version often is not.
What to check.
Tenant ledgers, not just the rent roll. A rent roll shows what tenants owe. Tenant ledgers show what tenants have actually paid, on what dates, and how often they have been late. A rent roll with $2,200 per unit looks different once you see that three units are consistently paying $1,400 on the 22nd instead of $2,200 on the 1st.
Vacancy pattern over the last 18–24 months. A current 6% vacancy tells you one thing. A trajectory that started at 3% 18 months ago and has climbed to 6% tells you something more important.
Concessions and free rent. Effective rent is not the same as listed rent. If the operator has given new tenants one month free on a 12-month lease, the effective rent is 8% below what the rent roll shows.
Family, friends, and employees. Rent rolls sometimes include below-market tenants who are related to or employed by the seller. The new owner inherits those relationships, and removing them often requires Ellis Act mechanics.
Operating expense ratios for LA multifamily typically run 32–38% of effective gross income on stabilized inventory. If a listing package shows a 25% ratio, something is missing.
What usually gets under-counted.
Property management fees. If the seller manages the building themselves and the listing uses their actual costs, the buyer needs to add 4–5% for professional management they will hire.
Insurance. LA multifamily insurance rates have risen significantly since 2023, particularly in wildfire-adjacent areas. A listing using a 2022 insurance quote is running old numbers.
Capital reserves. Not all operators set aside reserves for roof, plumbing, seismic retrofit, or ADA compliance. A clean underwrite budgets $300–$500 per unit per year in reserves for older inventory, more for deferred-maintenance buildings.
Property tax at reassessed basis. The seller's property tax reflects their Prop 13 basis. The buyer's will reflect the purchase price. On a building where the seller has held for 20+ years, the property tax line item doubles or triples at sale. If the buyer's pro forma uses the seller's tax, the NOI is overstated.
The cap rate you are paying should reflect the rent control regime the building sits under, because that regime caps the NOI trajectory.
Pre-1978 LA City: RSO-constrained. 4% rent growth ceiling starting July 2026. The cap rate you pay should factor in that the NOI trajectory is limited. Most institutional buyers are now adjusting pre-1978 LA City cap rates 20–40 basis points higher than they were in 2024.
Post-1995 LA City: Costa-Hawkins exempt. AB 1482 cap of 5% + CPI (10% max). Meaningfully more NOI upside. Cap rates on this class have compressed relative to pre-1978.
Unincorporated LA County: RSTPO-constrained at 60% of CPI, 3% ceiling. Tighter than LA City. The cap rate should reflect the structural NOI ceiling.
Outside City of LA, covered by AB 1482 only: fewer restrictions. Cap rates price accordingly.
Running a single "LA multifamily cap rate" without adjusting for regime is how buyers overpay in 2026.
One: what is this building's actual NOI trajectory over the next five years given the rent control regime it sits under? Not the trajectory you would like. The trajectory the rules allow.
Two: what does the sponsor's track record look like on this specific asset class in this specific submarket? General multifamily experience is not the same as pre-1978 LA City experience, which is not the same as post-1995 Valley experience. Each asset class has its own operating model.
Three: what is the real exit strategy? Every value-add deal has an exit story. The ones that work have a buyer pool waiting. The ones that do not have a story that assumes the buyer pool will exist.
The current market conditions create specific opportunities for disciplined buyers.
Post-1995 Costa-Hawkins inventory is the most competitive category. Cap rate compression has been strongest here. Buyer pool is deepest. Returns depend on operational execution rather than cap rate arbitrage.
Pre-1978 LA City with a clear value-add story offers cap rate expansion relative to 2024 purchase timing. The catch: the value-add thesis has to account for the July 2026 RSO rewrite, which constrains future rent capture. Deals that worked at 2024 underwriting often do not pencil at 2026 underwriting.
Unincorporated LA County trades at a structural discount because of the tighter RSTPO. For buyers who can accept the regulatory overhang, the price point is attractive. The overhang is real.
Off-market deals in core submarkets (Koreatown, Hollywood, parts of the Valley) continue to transact at meaningful discount to listed pricing. Access to off-market flow depends on broker relationships.
Most LA multifamily deals that go sideways go sideways because the buyer underwrote an assumption that did not hold. A rent roll that was overstated. An expense line that was understated. A cap rate that did not price the regime. A sponsor projection that assumed the 2021 buyer pool would still exist at exit.
The buyers who stay out of trouble are not the ones with the most complicated models. They are the ones who ran the three tests on every deal, walked away from the ones that failed, and did only the deals that passed.
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How do I analyze a multifamily deal in Los Angeles?
Run three tests. Is the rent roll real? Is the operating expense number real? Is the cap rate real for the rent control regime the building sits under? A deal that passes all three is worth deeper underwriting. A deal that fails any one is worth walking away from.
What is a good cap rate for a multifamily investment in Los Angeles?
Depends on submarket and asset class. Westside premium inventory trades at 3.5–4.5%. Koreatown and Hollywood at 4.0–5.0%. The San Fernando Valley at 5.0–6.0%+. Pre-1978 LA City inventory is seeing 20–40 basis points of cap rate expansion because of the July 2026 RSO rewrite.
How much money do I need to buy an apartment building in Los Angeles?
Depends on property price and financing. For a $3 million building at 70% LTV, expect roughly $900,000 in equity plus closing costs, inspection fees, and capital reserves. Post-1995 stabilized inventory supports higher LTV. Pre-1978 value-add supports lower LTV.
What is DSCR and why does it matter?
Debt Service Coverage Ratio — NOI divided by annual debt service. Lenders require minimums of 1.20–1.30 on most multifamily loans. Below that, the loan either will not close or requires you to bring additional equity.
Should I buy multifamily in LA in 2026?
For disciplined buyers with clear submarket and asset class focus, yes. The best current opportunities are in post-1995 Costa-Hawkins inventory and in off-market flow in core submarkets. The worst mistakes are buying pre-1978 LA City inventory on 2024 underwriting assumptions.
Michael Sterman is Senior Managing Director Investments at Marcus & Millichap, specializing in Los Angeles multifamily transactions. $1.41 billion across 254 closed transactions.
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