Rising Insurance & Property Taxes Are Quietly Eroding Your Building's Value

Here is the number that surprises owners: every dollar of operating cost you absorb and can't pass on to a tenant doesn't just cost you a dollar—it lowers what your building is worth by roughly that dollar divided by the cap rate. A modest expense creep, capitalized, turns into a real dent in value. The good news is that most of it is measurable, and a lot of it is controllable.

Why a small cost increase creates a large value loss

An income property is priced off its net operating income (NOI) divided by a cap rate. NOI is the rent you collect after operating expenses. So when an expense rises and you carry it yourself, NOI falls by that amount—and value falls by that amount divided by the cap rate.

The math is unforgiving because you're dividing by a small number. At a 6.5% cap rate, $20,000 of extra annual cost you can't recover reduces value by about $308,000 ($20,000 ÷ 0.065). At a 7.5% cap it's still roughly $267,000. That's why two cost lines—insurance and taxes—deserve more attention than most owners give them.

Insurance is the cost line moving fastest right now

Commercial property insurance in California has climbed sharply over the past few years. Carriers have pulled back on wildfire and catastrophe exposure, reinsurance got more expensive, and many owners have seen renewal increases in the 10–30% range—sometimes more for older buildings, sprinkler gaps, or roofs past their useful life. For an industrial building, insurance can quietly go from a rounding error to a line that meaningfully moves NOI.

The frustrating part is that premiums have risen even where nothing about the building changed. But that also points to the levers: updated roof and electrical documentation, a current sprinkler certification, and shopping the placement across more than one carrier often recover part of the increase.

Property taxes: slow while you hold, a reset when you sell

Property taxes behave differently. Under Proposition 13, your assessed value can rise no more than 2% a year for as long as you own the building. So for a long-time owner, taxes are usually not the line eroding your NOI—they grind up slowly and predictably.

The reset happens at a sale. A change of ownership triggers reassessment to current market value, so your buyer often inherits a materially higher tax bill than you've been paying. Sophisticated buyers underwrite that new basis, and it shows up as a lower price. It's worth understanding how a buyer will treat that number before you take your building to market—the same way you'd want to understand your building's value drivers before pricing it.

Pass-through vs. absorb: your lease structure decides who pays

Whether rising costs hit your value at all comes down to your leases. In a true triple-net (NNN) structure, taxes, insurance, and maintenance are reimbursed by tenants—so a premium spike is largely their problem, not yours, and your NOI is insulated. In a gross or modified-gross lease, or where an expense stop is set below today's actual costs, the owner eats the increase and NOI compresses in real time.

This is why lease structure is a value question, not just an accounting one. If your building is on gross leases and your carrying costs are climbing, you're absorbing increases that a NNN owner next door is passing through. Our guide to NNN lease structures walks through how each structure changes your real income and what your building is worth to a buyer.

What owners can actually do about it

Three moves recover most of the leakage. First, re-shop your insurance and tighten the risk profile—documentation, roof, sprinklers—so you're not paying a premium for uncertainty. Second, use renewals to close the pass-through gap: move toward NNN, reset expense stops to current costs, and add reimbursement of taxes and insurance where the market supports it. Third, know your reassessment math before you list, so the tax reset is priced in on your terms rather than discovered by a buyer.

None of this requires selling. But if the numbers show your NOI is being squeezed by costs you can't pass through, that's exactly the situation where a current valuation is worth having—so you can decide whether to fix the leases and hold, or sell into today's demand for well-run industrial.