Picture two escrows closing in the same week, both for homes just north of $6 million, both carrying the same 90210 zip code on the mailing address. One seller walks away with a $240,000 line item on the closing statement that the other never sees. Same price bracket, same postal code, same general stretch of hillside. The difference has nothing to do with the house. It has to do with which side of a municipal boundary the parcel happens to sit on.
That boundary is the City of Beverly Hills line, and right now it is one of the more consequential facts in this market that most buyers never think to ask about until their agent walks them through the math.
A Zip Code Is Not a City Limit
Los Angeles voters approved Measure ULA, the transfer tax widely known as the mansion tax, in November 2022, and it took effect on April 1, 2023. It applies to real property sales within the incorporated City of Los Angeles. Beverly Hills is not part of the City of Los Angeles. It is its own incorporated municipality, with its own charter and its own government, and that status means the tax simply does not reach properties inside Beverly Hills city limits. Neither does it reach Santa Monica, West Hollywood, or Culver City, for the same reason.
The complication is that Beverly Hills the brand and Beverly Hills the city are not the same footprint. The Beverly Hills Post Office designation, commonly shortened to BHPO, carries the 90210 zip code and every bit of the name recognition, but large portions of that hillside territory sit inside the City of Los Angeles, not inside the incorporated City of Beverly Hills. A buyer touring a home with a Beverly Hills mailing address in Trousdale or Benedict Canyon may be looking at a property that, for tax purposes, behaves exactly like one in Bel Air or Holmby Hills. The zip code tells you almost nothing about which government has jurisdiction over that parcel at closing.
What Crossing the Line Actually Costs
The thresholds reset every July 1 based on the Chained Consumer Price Index, and the current figures took effect on July 1, 2026. As of today, a sale within the City of Los Angeles is taxed at 4 percent once the price crosses $5,400,000, and at 5.5 percent once it crosses $10,900,000. Both rates apply to the full sale price, not just the amount above the line, which is what makes the threshold behave like a cliff rather than a slope.
| Sale price (LA City / BHPO) | ULA tax owed |
|---|---|
| $5,399,999 | $0 |
| $5,400,001 | roughly $216,000 |
| $6,000,000 | $240,000 |
| $10,900,000 | $599,500 |
A seller who prices a home at $5,399,999 owes nothing under Measure ULA. Price it two dollars higher and the same seller owes tax on the entire sum, not on the sliver above the line. That single-dollar jump is where a lot of pricing strategy conversations start on the LA City side of this market.
None of this applies once the parcel is inside Beverly Hills proper. A $6,000,000 sale in the Flats, the low-lying blocks generally south of Sunset Boulevard, carries no ULA exposure at all. The seller still pays the standard county documentary transfer tax that applies everywhere in Los Angeles County, a modest fraction of a percent, but the additional city-level layer that Measure ULA stacks on top of city-of-LA sales does not exist here. On a $6,000,000 escrow, that is the difference between writing a $240,000 check and not writing one.
Why the Money Has Been Moving Toward the Flats
Research cited in the ongoing policy debate over Measure ULA has found that the odds of a property selling above the $5 million threshold within the City of Los Angeles fell by roughly 55 percent since the tax took effect, a reduction significant enough that it has become a recurring talking point in the city's own reconsideration of the ordinance. Sellers at the high end have not stopped transacting. Many have simply priced around the threshold, waited, or looked at where else their equity could land without the added cost.
Beverly Hills proper has been one of the more visible landing spots. Over the three months ending in June 2026, the median sale price for a home in Beverly Hills stood at $4.7 million, up 37.6 percent from the same period a year earlier, with homes selling in an average of 56 days compared with 65 days the year before. Eighty-two homes sold that June, up from 66 the June prior. Closed transactions across the first quarter of 2026 also ran ahead of the same period in 2025, continuing a recovery from the market's 2023 low point. None of that growth proves Measure ULA is the only force at work, interest rates and buyer sentiment matter too, but the timing and direction line up with a market that has been actively absorbing sellers and capital that would rather not cross into LA City jurisdiction.
The BHPO Complication Almost No One Explains at the Open House
This is the detail that tends to surprise buyers who assume the 90210 zip code is a single, uniform market. It is not. A home in the actual City of Beverly Hills and a home in the BHPO hillside area can sit a few streets apart, share the same zip code, and face entirely different tax exposure on the way out. The BHPO side is subject to Measure ULA because it is legally part of the City of Los Angeles. The city side is not.
That distinction is worth confirming early, not after an offer is written. The zip code on a listing sheet will not tell you which government has jurisdiction over the parcel. The property's actual location relative to the Beverly Hills city boundary will, and that boundary can run down the middle of a hillside in ways that are not obvious from a map glance or a drive-by.
A Line That May Not Hold Through November
None of this is guaranteed to stay in place. The Howard Jarvis Taxpayers Association gathered enough signatures for a statewide initiative, certified by the California Secretary of State on May 3, 2026, that will appear on the November 3, 2026 ballot. If voters approve it, every municipal real estate transfer tax in California, Measure ULA included, would be capped at 0.05 percent of the sale price, a fraction of the current 4 and 5.5 percent rates. The measure has drawn support from the California Association of Realtors and opposition from the coalition that originally campaigned for Measure ULA in 2022.
Whatever the outcome, the point for anyone transacting in this market right now is that the tax advantage sitting on the Beverly Hills side of the line is a feature of today's rules, not a permanent structural fact of the neighborhood. A seller weighing whether to list this fall or wait until next year is not just making a pricing decision. They are making a bet on how a statewide ballot measure lands in a few months.
What This Means If You're Comparing Neighborhoods Right Now
If you are cross-shopping Beverly Hills against Bel Air, Holmby Hills, Brentwood, or a BHPO hillside address, the sale price on the listing sheet is not the number that determines your total cost or net proceeds. The jurisdiction does. That means the useful question is not "what zip code is this," it is "which government has authority over this specific parcel," and the answer requires checking the property against the actual Beverly Hills city boundary rather than assuming the mailing address settles it.
For sellers near the $5.4 million or $10.9 million marks, the threshold cliff also changes how you think about your final list price. A few dollars in either direction can be a six-figure decision, and that math should be part of the pricing conversation before a sign goes in the yard, not something discovered at the closing table.
A Few Straight Answers
Does Beverly Hills have its own version of the mansion tax? No. Measure ULA is a City of Los Angeles ordinance. Beverly Hills is an independent incorporated city and is not subject to it.
If a property has a Beverly Hills mailing address, is it automatically exempt? Not necessarily. Some Beverly Hills-addressed properties, particularly in the BHPO hillside areas, sit inside the City of Los Angeles and are subject to Measure ULA despite the zip code.
Could this change soon? Possibly. A statewide initiative on the November 3, 2026 ballot would cap municipal transfer taxes across California at 0.05 percent, which would significantly reduce the current gap between LA City and independent cities like Beverly Hills.
Real estate decisions at this level involve more moving pieces than a single median price can capture, and a boundary line that most buyers never think to check is one of them. If you are weighing a purchase or a sale anywhere along this stretch of the Westside and want a clear read on how jurisdiction, timing, and pricing intersect for your specific address, Jeffrey Sachs is available to schedule a consultation and walk through the numbers with you directly.
