Insurance used to be a predictable line item on a Los Angeles apartment building operating statement. It is not anymore. When insurance costs rise 30% in a year and rents stay flat, the compression hits NOI directly. NOI is what buyers buy. Lower NOI means lower implied value at the same cap rate. This article explains exactly how that math works and when it changes the hold-or-sell answer.

How Bad the Insurance Increase Actually Is

The Federal Reserve published a detailed analysis in September 2025 documenting the increase in multifamily property insurance costs. LA specifically saw 30% year-over-year premium increases in 2024. The January 2025 wildfires, estimated to cause $135 to $150 billion in total damages, triggered further rate increases and carrier withdrawals in 2026.

A significant portion of California multifamily properties in high-risk zones have shifted to the California FAIR Plan, the insurer of last resort. FAIR Plan policies provide basic fire coverage but exclude liability, loss of rents, and several standard coverage components. Owners supplement FAIR Plan with a Difference in Conditions (DIC) policy. The combined cost exceeds standard policy pricing and the coverage is still inferior.

NAA benchmarking data shows that across the top 30 metros, 27 experienced 10% or higher insurance cost increases in the most recent measurement period. LA sits among the highest. Insurance has grown from 8% of total multifamily operating expenses to nearly 17% of total expense growth.

The Exact NOI Compression Calculation

The valuation math is NOI divided by cap rate equals value. When insurance costs increase and rents do not, NOI falls and implied value falls by the same ratio.

Annual Insurance Increase	Cap Rate 4% (Westside)	Cap Rate 5% (Mid Market)	Cap Rate 6% (Value Markets)
$5,000 increase	$125,000 value loss	$100,000 value loss	$83,000 value loss
$10,000 increase	$250,000 value loss	$200,000 value loss	$167,000 value loss
$20,000 increase	$500,000 value loss	$400,000 value loss	$333,000 value loss
$30,000 increase	$750,000 value loss	$600,000 value loss	$500,000 value loss

On a 12-unit building where insurance costs increased from a 2019 baseline by 119%, the cumulative implied value reduction at a 5% cap rate exceeds $700,000 with no change in rent income and no change in cap rate. The sole driver is insurance cost inflation absorbed entirely by the owner.

Why RSO Prevents You From Recovering These Costs

For owners of RSO-covered apartment buildings, roughly 650,000 units in the City of Los Angeles built on or before October 1, 1978, the ability to pass insurance cost increases to tenants is eliminated.

The December 2025 RSO amendment removed utility surcharges effective February 2, 2026. There is no specific insurance cost pass-through mechanism in the RSO. Annual rent increases are capped at 4% maximum under the new formula effective July 1, 2026. An insurance cost increase of 30% in a single year with a 4% rent increase cap creates a structural deficit that the owner absorbs entirely.

Non-RSO buildings covered by AB 1482 face similar constraints. The statewide 5% plus CPI cap limits annual increases. Insurance cost inflation of 25 to 30% in 2024 significantly exceeded allowable rent increases for both RSO and non-RSO buildings.

What Buyers Are Underwriting on Insurance in 2026

Buyers do not use your current insurance premium to project future expenses. They underwrite a forward-looking insurance cost reflecting the trajectory of the market. In practice, buyers add 10 to 20% to your current premium when modeling NOI for acquisition. A building paying $48,000 per year is underwritten at $55,000 to $58,000 in a buyer’s model.

Buyers also apply a risk discount for FAIR Plan carrier concentration. A building insured through the FAIR Plan rather than a standard admitted carrier signals elevated risk and limited coverage. Buyers price that signal into their offer on top of the pure cost increase.

The practical step before listing: include your full insurance declaration page and the past two renewal invoices in your due diligence package. Buyers who see the actual cost trajectory discount less aggressively than buyers who estimate it. Uncertainty is where buyers apply the largest risk premiums.

For current market conditions including vacancy, rent trends, and cap rates that affect your building’s value, see our 2026 LA multifamily market report. For the RSO rent increase formula and what the 4% cap means for your projected NOI, read our breakdown of the 2026 RSO rent increase formula.