Insurance is the fastest-rising building cost of the last five years

On 1 October, renewal leases in New York City's rent-stabilized apartments begin a year at 0%, set by the Rent Guidelines Board on 25 June after hearings on tenant incomes and owner costs. The rent line is fixed for twelve months. The cost lines are not.

The occasion is a study. Milford Street Captive Insurance Company issued it through PRWeb on 11 September 2026 at 15:32 ET. This is analysis of a twelve-day-old release. Milford Street sells affordable-housing liability cover and paid for the research, which LegalClaimsAI and the NYU Furman Center ran. It is the second cut of one dataset; the first ran on 11 March 2026. Data is cheaper to re-cut than to collect.

The number

The study analysed 21,992 of 56,289 claims filed from 2021 to 2025, matched to 18,745 buildings. Claims per 100,000 apartments: 128.69 in 2021, 218.32 in 2024. The release calls that nearly doubled. On its own figures it is 69.6%.

In 2025 it eased to 200.3, provisionally: late filings still land. The Bronx peaked at 253.42 in 2024; Brooklyn's peak is given as 151.7, with no year attached. Building type splits harder than borough: stock at least 90% rent-stabilized runs highest of any type, on a thin figure.

The mechanism

These are injury suits brought by people. Milford Street's March release put settlement at about nine in ten, payouts averaging close to six figures. The insurer prices the next renewal off that loss history, so the premium rises. Premium is a fixed per-unit cost. It does not fall when an apartment sits empty, and in a stabilized building it cannot be passed on outside the Board's annual order. It comes out of maintenance and reserves. Under all of it sits Labor Law 240, the scaffold law: liability on the owner for gravity-related injury regardless of fault.

New York Apartment Association testimony, cited by two trades, puts insurance per stabilized unit at $703 in 2020 and $1,501 in 2024, the Bronx and Northern Manhattan up 134%. Live Insurance News works a 50-unit Bronx building: about $35,150 to $75,050. The annual rate is unsettled: Insurance Journal reports 21% a year for 2019 to 2023, citing the New York Housing Conference; Insurance Business Magazine and Live Insurance News report 26%, on a different per-unit series, $869 to $1,770. Nobody reconciles them.

What the trade coverage skipped

None of the five trade write-ups opened the city's books. The Board's 2026 Price Index of Operating Costs, published 9 April, tracks seven cost components in stabilized buildings. Insurance rose 10.5% in the year to March 2026, second behind fuel at 11.0%, against overall costs up 5.3%. Over five years it rose 99.9%, fastest of the seven, against 31.0% for the index. Its share went from 6.5% in 2022 to 9.5% in 2026 while taxes fell from 36.1% to 27.9%, and it supplied 6.8 of the index's 31.0 points off the second-smallest weight. The Board projects it up 16.9% for the index year ending March 2027.

Separate datasets: no source ties the index's insurance line to the claim counts. The same Board that measures insurance as its fastest-rising component over five years set the renewal adjustment at zero. Both documents are public. They are not the same document.

Who it hits here

Brooklyn's rate sits below the Bronx's; building type matters more, and heavily stabilized pre-1974 walk-ups are common stock in Boro Park, Williamsburg and Crown Heights. The dataset stops at the city line, so it carries no figure for Lakewood, Monsey or Cleveland. What travels is the mechanism, not the rate.

The timeline

PRWeb, 11 September, 15:32 ET, with InsuranceNewsNet the same day. Insurance Business Magazine, 14 September. Live Insurance News, 14 or 15 September. Captive Insurance Times, 15 September. Captive International, 16 September. Insurance Journal, 23 September. Every version traces to the release; none of the six obtained the data, and two are captive trade titles serving the industry that paid for it.

What to watch

The 2027 operating-cost index lands around early April 2027 and shows whether the 16.9% arrived; the Board projected 17.7% this year and measured 10.5%, a 7.2-point miss. Then whether the rate falls again after 200.3, which turns nearly doubled into peaked in 2024. And the denominators: March counted 27,000 suits against roughly 199,000 buildings citywide; September, 21,992 claims matched to 18,745 buildings, a sample and not the city's stock. Side by side they look like a decline. They are not the same measurement.