Two nearly identical Spanish revival homes sit on the same tree-lined block north of Montana Avenue. Same lot size, same school district, same walk to the bluffs. One sells for $7,950,000. The other sells for $8,150,000, a full $200,000 more. And the seller of the second home walks away from closing with roughly $200,000 less in the bank than the seller of the first.
That is not a hypothetical built to scare you. It is arithmetic, and it comes from a tax most sellers outside Santa Monica have never heard of.
If you have followed the coverage of Los Angeles' Measure ULA, the so-called mansion tax on sales inside the City of Los Angeles, you should know Santa Monica is a separate city with its own tax structure. ULA does not apply here. But Santa Monica passed its own version in 2022, and it works differently in a way that matters if your home is anywhere near a specific number: $8,000,000.
How the Cliff Actually Works
Santa Monica charges a documentary transfer tax on every sale, on top of the standard Los Angeles County transfer tax that applies everywhere in the county. The city's own published rate structure sets the base tiers at $3.00 per $1,000 of value (0.3%) for sales under $5 million, and $6.00 per $1,000 (0.6%) for sales of $5 million or more.
Then there is Measure GS. Voters approved it in November 2022, and it took effect March 1, 2023, adding a third tier: any residential or commercial sale of $8 million or more is taxed at 5.6% of the full purchase price. Not 5.6% of the amount above $8 million. Of the whole thing.
That distinction is the entire story. Here is what it looks like at the line:
| Sale price | Applicable city rate | City transfer tax owed |
|---|---|---|
| $7,999,999 | 0.6% | about $48,000 |
| $8,000,000 | 5.6% | $448,000 |
One additional dollar of sale price triggers $400,000 more in tax. There is no phase-in, no marginal bracket the way income tax works. Cross the line and the entire sale price gets taxed at the higher rate.
Sell for one dollar more, owe four hundred thousand dollars more. That is not a rounding error in a spreadsheet. That is the actual mechanism.
This is on top of the base Los Angeles County transfer tax of $1.10 per $1,000, which applies regardless of city and is a smaller, separate line item at closing.
The Market Already Reacted
Numbers on a rate schedule are one thing. What sellers actually did in response is more telling. In the twelve months before Measure GS took effect, 32 residential sales in Santa Monica closed at $8 million or more. In the twelve months after, that number fell to 15, a decline of 53%. Commercial sales in the same price band fell even harder, from 18 down to 5, a 72% drop.
That is not a market that quietly absorbed a new cost. That is a market where a meaningful share of sellers at the top of the price range either priced under the line, waited, or decided not to sell at all. If you are listing a property anywhere near $8 million today, you are entering a market that has already been shaped by three years of sellers making exactly that calculation.
What Breakeven Actually Looks Like
Say you would net $7,952,000 after tax on a $7,999,999 sale. To do better than that by pricing above $8 million, you need to clear roughly $8.4 million in gross sale price, since 5.6% of anything above that erases the gain from the higher number. Below roughly $8.4 million, a sale priced just under $8 million puts more money in your pocket than a sale priced just over it, even though the sticker price is lower.
This is not a small technicality for North of Montana sellers. Current single-family inventory in that neighborhood spans roughly $7.9 million up into the tens of millions, which means a real slice of what is on the market right now sits directly inside the zone where a few hundred thousand dollars of list price, in either direction, changes the outcome by hundreds of thousands of dollars in net proceeds.
These figures are illustrative and depend on your specific liens, commission structure, and closing costs. The point is not the exact dollar. The point is that pricing a home near $8 million in Santa Monica is not just a marketing decision. It is a tax decision, and it deserves the same scrutiny you would give a 1031 exchange or a capital gains question, worked through with your escrow officer and a tax professional before you set a number.
The Narrow Exceptions
Measure GS applies to both residential and commercial transfers inside city limits, and the carve-outs are few. Transfers to qualifying nonprofit affordable housing developers and community land trusts are exempt. Transfers into a revocable living trust are exempt too, but only where beneficial ownership does not actually change hands, along with certain other transfers that already qualify for standard county and state transfer tax exemptions, such as confirming a community property interest between spouses. A straightforward sale to an unrelated buyer at $8 million or above does not qualify for any of these.
A Political Wildcard for Timing
Two developments are worth watching if you are weighing when to list. A former Santa Monica mayor has proposed a ballot initiative that would carve multi-family dwellings out of the transfer tax entirely, aiming for the fall 2026 ballot. Separately, a statewide measure backed by the Howard Jarvis Taxpayers Association is moving toward California voters and would cap municipal transfer taxes and raise the bar for local governments to increase them, which would directly affect Measure GS if it passes.
Neither of these has happened yet, and neither should be the reason you rush or delay a sale on its own. But they are both real, active, and worth a conversation with your agent about how they might affect a listing timeline for anything near the $8 million mark.
A Few Questions Sellers Ask
Is this the same as the LA mansion tax I keep hearing about? No. Measure ULA is a City of Los Angeles tax that starts around $5.4 million with rates of 4% and 5.5%. Measure GS is Santa Monica's own tax, with a single steep tier at $8 million and above. They do not overlap, and a Santa Monica sale is never subject to ULA.
Does putting my home in a trust get me out of it? Only if the transfer genuinely does not change who beneficially owns the property. Moving a home into your own revocable living trust typically qualifies for the exemption. Selling it to a buyer, even through an entity, does not.
Does this affect a sale of a duplex or small apartment building? Yes. Measure GS covers commercial and multi-family real estate as well as single-family homes, which is part of why the proposed carve-out for multi-family dwellings is being discussed for the fall 2026 ballot.
If your property is approaching that $8 million line, the conversation about price should start well before you pick a number for the sign in the yard. Blanche D'Souza has spent more than two decades reading Westside micro-markets block by block, and pairs that experience with Compass Concierge preparation to make sure a home is presented at its strongest before pricing decisions get made. If you are weighing a Santa Monica sale near this threshold, or anywhere on the Westside, let's connect and work through what the numbers actually mean for your property.
This post is for general information only and is not tax or legal advice. Transfer tax rates, thresholds, and exemptions can change, and your actual net proceeds depend on your specific transaction. Confirm current figures with a qualified tax professional or real estate attorney before setting a list price or closing a sale.