Ask most people what moves an apartment building's value and they'll say rent. Rent gets the headlines. But over the last five years, the line item that has quietly done the most to reshape multifamily underwriting isn't on the revenue side at all — it's insurance. Premiums have climbed fast enough to swallow rent growth whole in the wrong markets, and the pain is deeply regional. That second fact is the one that matters most from where we sit, because it hands inland Mountain West operators an underwriting edge that has nothing to do with being smarter and everything to do with being somewhere the weather doesn't try to destroy the building.

The Line Item That Reset

The scale of the move is easy to under-appreciate because it happened in the background. According to the National Apartment Association's Premium Pulse analysis, property insurance rose from about 1.95% of multifamily revenue in 2000 to 4.78% by 2024. Per-unit premiums went from roughly $502 in 2021 to $777 in 2024 — a 55% jump in three years — and Federal Reserve data cited in the same analysis puts the real per-unit cost rising from about $465 to $821 between 2019 and 2024, up 77%. The steepest single year was 2023, when premiums rose about 25%.

Sit with what that does to a pro forma. If insurance nearly doubles as a share of revenue over a hold period, it doesn't just trim margin — it resets the baseline. A building underwritten in 2021 against 2021 insurance assumptions can miss its debt-service coverage on the insurance line alone by the time the loan matures, before anything happens to rent or occupancy. This is why we've long argued that the expense side, not the rent roll, is where deals quietly die. Insurance is now the clearest example of that principle in the market.

It's Not High Everywhere — and That's the Whole Point

Here's the part that gets lost in national averages: insurance isn't rising uniformly. It's rising where the risk is. Insurers price catastrophe exposure — hurricanes, coastal flooding, hail, wildfire, convective storms — and they price it hard. The NAA analysis notes that in certain markets, per-unit rates now surpass $1,200; Houston is the example it names. Gulf Coast, coastal Southeast, and parts of the wildfire and hail belts carry premiums that inland markets simply don't.

The Treasure Valley sits on the favorable side of nearly every one of those risk factors. No hurricane exposure. No coastal storm surge. Minimal convective-storm and hail activity relative to the Plains and Southeast. Wildfire risk that, for urban-infill multifamily in Meridian and Boise, is far lower than for the California markets it's often lumped with. When an insurer prices a stabilized apartment community here, it isn't loading the premium for a once-in-a-decade catastrophe scenario the way it does on the Gulf. The result is a structurally lower, more stable insurance line — not because we negotiated better, but because of where the building stands.

You can out-negotiate a premium at the margins. You can't out-negotiate a hurricane zone. Location decides the insurance line before the broker ever picks up the phone.

Why a Cost Advantage Compounds Over a Hold

A lower insurance line is worth more than its annual dollar savings, for two reasons that matter to a long-hold owner.

First, it compounds. A structurally lower expense base means more of every rent dollar reaches NOI, every year, for the life of the hold. Over the ten-year horizon we actually underwrite to, a persistent expense advantage is worth far more than a one-time acquisition discount. It's the quiet kind of edge that doesn't show up in a year-one headline but decides where the asset lands at year ten.

Second, it's more predictable. Catastrophe-exposed markets don't just carry higher premiums — they carry more volatile ones, capable of repricing 25% in a single renewal after a bad storm season somewhere else in the region. An inland Mountain West operator can underwrite the insurance line with far more confidence about what it will be in year five. Predictability is underrated: the cost you can forecast is the cost that doesn't blow up your refinance.

How We Underwrite the Line

Knowing insurance is a problem isn't the same as underwriting it correctly, and this is where a lot of models go wrong. Three habits keep us honest on it:

  • Trend it forward, not backward. The seller's trailing-twelve insurance number is history. We underwrite to what the line renews at, not what it cost last year — because in this environment last year's premium is almost always the low.
  • Get a real quote, not a placeholder. Before we commit, we want an actual bindable indication for the specific asset, not a percentage-of-revenue rule of thumb. Insurance is too big and too idiosyncratic now to model with a plug number.
  • Sensitivity-test the refinance. A premium that works at today's coverage can break the debt-service math at the next renewal or refinance. We stress the line up and make sure the deal still clears — if it only works at flat insurance, it doesn't work.

An inland Idaho asset makes all three of these easier, because the number we're trending, quoting, and stressing starts lower and moves less. The discipline is the same everywhere; the geography just gives us more room for the answer to come back yes.

What This Means for How We Operate

The insurance reset reinforces the operating posture we've held from the start rather than changing it. When the expense base resets permanently higher across the industry, two things become more valuable, not less: expense discipline and retention.

Expense discipline, because in a world where insurance and taxes have permanently claimed more of the revenue line, the operators who survive are the ones who underwrote those lines honestly and bought at a basis that works against 2026 costs, not 2021 costs. Retention, because every avoided turnover protects the NOI that a higher expense base is already squeezing — you can't control the premium, so you protect the income that has to cover it.

For capital partners weighing where to place long-hold multifamily capital, the insurance story is a real, if unglamorous, argument for the inland Mountain West. Two otherwise identical buildings — same rent, same occupancy, same age — can throw off materially different NOI over a decade purely because one sits in a catastrophe zone and one doesn't. We'd rather own the one where the weather isn't a line item. Our portfolio sits in Meridian in part for exactly that reason: The Enclave and Arete carry an expense profile that a Gulf Coast or coastal-California equivalent can't match, and that gap widens every year the catastrophe markets reprice.

What We're Watching

  • Whether the regional insurance divergence widens or narrows — a few calm catastrophe seasons could soften Gulf pricing, but the structural gap favoring inland markets is unlikely to close.
  • Property-tax reassessments, the other expense line quietly resetting underwriting math, and how Idaho's trajectory compares to expansion markets.
  • How lenders treat the insurance line in sizing — rising premiums are increasingly a debt-service-coverage constraint, not just a margin one.
  • Whether operators in catastrophe markets start passing insurance through to residents in ways that pressure their effective rents and retention.

Rent will always get the attention. But the operators who compound wealth over a full cycle are usually the ones who got the boring lines right — and in 2026, insurance is the least boring boring line in the business. Subscribe below for more on the expense side of the ledger.