The moment you sell, your Prop 13 protection dies — but it doesn't die for you. It dies for the buyer. Under Proposition 13, the sale is a change in ownership that resets the assessed value to current market value (boe.ca.gov), and the buyer inherits a property-tax bill calculated on what they paid, not on what you paid in 1994. The low assessment you've enjoyed for thirty years does not transfer. It evaporates at the closing table, and the buyer prices that into their offer before you ever see it.
That is the part most sellers get backwards. They think the reassessment is a problem they'll dodge by selling. It is — for them. The buyer is the one who absorbs it, and that absorption shapes the number on the offer sheet.
Prop 13 caps the property-tax base at 1% of assessed value, and assessed value can rise no more than 2% a year while one owner holds (boe.ca.gov). Hold a building long enough and the gap between your assessed value and its real value becomes enormous. That gap is your subsidy.
A sale resets the assessed value to the new market value — the purchase price, in most arms-length deals. The new owner's tax bill is recalculated from there. What does not reset: the underlying 1% rate, the 2%-per-year cap going forward, and any voter-approved local bonds layered on top. The buyer doesn't lose Prop 13 protection. They simply restart it at today's value, which is a far higher floor than yours.
Here is the honest tension nobody at your CPA's office frames this way. A deeply discounted Prop 13 basis is one of the strongest reasons to keep a building. Every year you hold, your carrying cost stays frozen while rents and value climb around it. That frozen tax bill is real money the next owner will never see.
But the moment you decide to sell, that same low basis works against the price. The buyer is not buying your tax bill. They are buying a reassessed tax bill — often several times higher — and they underwrite the building on their carrying cost, not yours. I have watched this play out across the deal book: two identical buildings, same submarket, and the one with the lower legacy assessment doesn't fetch a premium for it. The buyer's reassessed expense is the same either way. Your tax savings stay with you and never make it into the sale price.
That's the quiet trap of holding a long-basis building too long. The subsidy is enormous while you own it and worth nothing when you sell.
A buyer underwriting an LA building runs their own numbers on the reassessed tax line, and in a market where price per unit sat at $278,384 as of January 2026, down 3% year over year per Kidder Mathews, that reassessed expense is a meaningful drag on the carrying cost. Higher property tax means a higher annual expense the day they take title, and that expense lowers what the building throws off — which lowers what they'll pay.
This is why the reassessment matters even though you're not the one paying it. The buyer prices the building net of the tax they'll inherit. A seller who understands this isn't surprised when offers reflect a tax bill several times the one on their current statement. A seller who doesn't understand it spends the negotiation arguing about a number that was never going to be theirs.
It's also why the regulatory regime check matters alongside the tax one. A pre-1978 building under the LA City RSO rewrite taking effect July 2026 gets underwritten on constrained rent growth and a reassessed tax bill at once. Both land on the buyer's expense side. Both shape the offer.
If you inherited the building, the calculus shifts. Before Proposition 19 took effect in 2021, a parent could pass an investment property to a child and the child kept the parent's low Prop 13 basis. That broad parent-child exclusion is gone. Prop 19 limits the exclusion to a primary residence the heir then occupies — and an apartment building you don't live in does not qualify (boe.ca.gov).
For most heirs, that means the inheritance itself triggers reassessment to market value, with or without a sale. The low basis your parent guarded for decades resets the day it transfers to you. This is the fact that reframes the hold-versus-sell decision for so many inheriting families: the subsidy you assumed you'd keep is already gone. Once it's gone, the strongest reason to hold the building goes with it — and many heirs who walk in certain they'll keep the building walk out deciding to sell. If you're weighing that, start with how to price a building you inherited and the broader hold-versus-sell question.
Your Prop 13 basis is a reason to hold and a non-factor in your sale price — both true at once. Don't expect a premium for the low assessment you've carried; the buyer reassesses from zero and prices on their bill, not yours. If you inherited recently, confirm with your CPA whether Prop 19 already triggered reassessment, because that changes everything about whether holding still makes sense.
The reassessment is also tangled with the rest of your sale tax picture — capital gains, depreciation recapture, and Measure ULA on the transfer itself. See how depreciation recapture works on an LA sale for the piece most sellers forget until it's too late to plan around.
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Michael Sterman is Senior Managing Director Investments at Marcus & Millichap. This is informational, not tax or legal advice — consult a CPA and estate attorney on Prop 13, Prop 19, and your specific situation.
The day you inherited the building, the clock you thought you were beating had already run out.
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