A spec mansion on Donhill Drive hit the market this month asking $35 million. The address carries a 90210 zip code, the same three digits stamped on some of the most tax-favored real estate in the country. But Donhill Drive sits inside the municipal boundaries of the City of Los Angeles, not the incorporated City of Beverly Hills, and that distinction alone could cost its eventual seller close to $1.9 million at closing.
That is Measure ULA, Los Angeles' transfer tax on high-value property sales, doing exactly what it was built to do. It is also a preview of the math every seller in Beverly Hills Post Office needs to run before choosing a list price, because BHPO is the rare pocket of the Westside where two entirely separate lines, one drawn by a city council and one drawn by insurance underwriters, land on the same house at the same time.
A Zip Code Is Not a City Limit
The confusion is understandable. BHPO shares its mailing address with the Flats, Trousdale Estates, and the rest of the neighborhoods that make up actual Beverly Hills. What it does not share is a city government. Beverly Hills is its own incorporated city, and Measure ULA, formally the Homelessness and Housing Solutions Tax, applies only to property sales within the incorporated City of Los Angeles. Beverly Hills, Santa Monica, Culver City, and West Hollywood sit outside that boundary and outside the tax entirely.
BHPO does not. The neighborhood carries the coveted 90210 address, but the parcels themselves fall under Los Angeles city jurisdiction, according to the Los Angeles Office of Finance. That makes BHPO subject to the same transfer tax that applies to a sale in Brentwood, Hancock Park, or Encino, while a nearly identical estate a few blocks away in the Flats or Trousdale pays nothing under Measure ULA at all.
What the Tax Actually Costs at Today's Thresholds
The rates themselves are fixed. The dollar thresholds are not. Because they adjust every July 1 based on the Chained Consumer Price Index, this year's numbers are higher than what sellers may remember from 2023 or 2024. For any transaction closing after June 30, 2026, a sale between $5.4 million and just under $10.9 million owes a 4 percent transfer tax. A sale at $10.9 million or above owes 5.5 percent.
The tax applies to the entire sale price once a transaction crosses the line, not just the portion above it. On the Donhill Drive listing, a sale at its $35 million ask would land in the top bracket and generate a transfer tax of roughly $1.9 million, a bill that a comparable estate technically inside Beverly Hills city limits would never see. That figure sits on top of the standard documentary transfer taxes that apply to every sale in the city regardless of Measure ULA, so it is additive rather than a replacement for existing costs.
This is not a rounding error in a net-proceeds sheet. It has visibly changed how people price and time sales above the threshold. UCLA research on the tax's early years found that the odds of a Los Angeles property selling for more than $5 million fell by as much as 55 percent after the tax took effect, and a separate Cato Institute study released in December 2025 found that transaction volume for eligible high-value properties dropped 38 percent. Those are two different measurements, one about the likelihood a sale crosses the threshold at all and one about overall deal volume, but they point in the same direction: sellers near the line are pricing around it, not through it.
That is why threshold pricing has become a routine conversation in BHPO listings that fall anywhere close to $5.4 million or $10.9 million. Listing a hair under the line rather than a hair over it can leave a seller with more in hand than listing higher and absorbing the tax, since crossing the threshold pulls the full price into the higher bracket rather than just the excess.
The Second Boundary, Drawn by Insurers Not Councils
The tax line follows a city map. The second friction facing BHPO sellers follows the terrain, and it does not care what jurisdiction a parcel sits in.
Admitted insurance carriers have been retreating from California's hillside and canyon zip codes for several years now, and the retreat has concentrated hardest in exactly the kind of hilly, brush-adjacent terrain that defines Trousdale, BHPO, and Benedict Canyon alike. Wealthy hillside communities in Beverly Hills, Malibu, and Bel Air now make up a growing share of the risk carried by the California FAIR Plan, the state's insurer of last resort, according to a Bloomberg analysis reported in Claims Journal and Insurance Journal this July. The FAIR Plan's residential policy count grew 151 percent between September 2022 and March 2026, while its total exposure jumped to $700 billion over the same stretch.
For a BHPO seller, this shows up well before closing. Buyers on these hillside streets are increasingly being pushed onto the FAIR Plan layered with a separate difference-in-conditions policy to cover what the FAIR Plan excludes, and combined premiums on a multimillion-dollar hillside estate can run into the tens of thousands of dollars annually. A clean insurance binder has become something closer to a primary escrow contingency on these transactions than a formality handled quietly in the background, which means a buyer's ability to actually insure a hillside BHPO property now shapes whether a deal closes at all, independent of financing.
Trousdale faces this same insurance exposure. So does Benedict Canyon. What sets BHPO apart is that it absorbs the insurance problem and the tax problem at once, while its hillside neighbors across the Beverly Hills city line absorb only the first.
Where the Two Lines Actually Cross
Laid out side by side, the pattern becomes clear enough that it changes how a listing should be priced and marketed from day one.
| Sub-market | Measure ULA exposure | Hillside insurance exposure |
|---|---|---|
| Beverly Hills Flats | None (inside Beverly Hills city limits) | Low (flat, non-hillside terrain) |
| Trousdale Estates | None (inside Beverly Hills city limits) | High (hillside terrain) |
| Beverly Hills Post Office | Full exposure (inside City of LA) | High (hillside terrain) |
The Flats sidestep both frictions entirely. Trousdale absorbs the insurance problem but not the tax. BHPO is the only one of the three carrying both, which is exactly why a $35 million BHPO listing and a $35 million Trousdale listing can have very different net-proceeds conversations even though they sit less than a mile apart and share the same 90210 address.
What This Means When You Price a BHPO Listing
None of this argues against selling in BHPO. The neighborhood's hillside privacy, generous lots, and proximity to the Beverly Hills core remain real advantages, and the broader luxury market has shown it can absorb these costs. Los Angeles County transactions over $10 million actually surged more than 50 percent year over year in 2025, even as sales of $20 million or more slipped 28 percent between January and July of this year compared with the same stretch in 2025. The top end of this market is not shrinking. It is getting more selective about where cost sits relative to price.
What it does argue for is pricing a BHPO estate with both frictions modeled from the start rather than discovered mid-escrow. That means running the ULA math at the actual expected sale price, not the wishful one, before setting a list price near either threshold. It means requesting insurance quotes in the opening days of escrow rather than the closing ones, since a buyer's inability to bind coverage can stall or unwind a deal that has already cleared every other contingency. And for estates priced well above the top ULA bracket, where threshold pricing no longer helps, it means building the tax and the insurance carrying cost into the marketing conversation with buyers up front, so neither becomes a surprise that reopens negotiations three weeks before closing.
A Few Questions Worth Asking Before You List
Does Trousdale face the same tax exposure as BHPO? No. Trousdale Estates sits inside the incorporated City of Beverly Hills and is exempt from Measure ULA entirely, even though it shares the hillside terrain and the insurance challenges that come with it.
Can a seller simply price under the threshold to avoid the tax? Sellers near the $5.4 million or $10.9 million lines often do exactly this, since a sale even one dollar over either threshold pulls the entire price into the higher bracket rather than just the amount above it. Whether that trade makes sense depends on where a specific property would otherwise land in its market.
Does the insurance situation affect financed buyers more than cash buyers? It affects both, but it shows up differently. A lender will not fund a loan without bound coverage in place, so financed buyers face a harder deadline. Cash buyers still need coverage to protect the asset, but they have more flexibility on timing during escrow.
If you own or are considering a purchase in Beverly Hills Post Office, the pricing conversation now has two variables that did not exist a few years ago, and getting the sequence right, insurance quotes early, tax math before you set a number, matters more than it used to. Joseph Babajian has spent more than two decades working these exact hillside streets and can walk you through what both of these lines mean for your specific address. Request a confidential home valuation or private consultation to start that conversation before you set a list price.
