The Zoning Line That Splits Upper Brookville Into Two Different Housing Markets

Pull up Upper Brookville on four different real estate sites and you will get four different villages. One shows a median list price under $2 million. Another puts the average closer to $5.8 million. One counts a dozen homes for sale. Another counts nearly three times that. If you are comparing this village against Old Westbury or Muttontown before you make a move, the numbers do not just vary, they contradict each other outright.

The instinct is to assume the data is stale or the sample sizes are too small to mean anything. That is not quite what is happening. Upper Brookville is not one housing market wearing one name. It is two, and the split was drawn by zoning ordinance decades ago, then tested all the way to the United States Supreme Court.

Four Snapshots, One Village

Look at how differently the same village reads depending on which slice of inventory you happen to catch.

Notice the two figures that sit furthest apart in that table: an 8-day average time to sell in the December snapshot, against a 173-day median for active listings eight months later. Those are not measuring the same thing, and that is precisely the point. One is tracking homes that already found a buyer, likely because they were priced into the faster-moving half of the village. The other is tracking everything currently sitting on the market, including estate-scale properties that take much longer to place with the right family. Average the two together and you get a number that describes neither.

The Line the Supreme Court Left in Place

The reason those two halves exist at all traces back to a single piece of village legislation and a landowner who fought it through the courts, all the way up.

Upper Brookville's zoning code was first adopted in 1933 and rewritten in its entirety in 1996, but the district map underneath it dates to December 1960. That map created exactly two residential zones and nothing else: a Residence R1 District requiring two-acre lots, and a Suburban Estate OP1 District requiring five-acre lots. No commercial zone, no multifamily zone, just those two.

In the 1970s, a developer named Robert E. Kurzius owned land inside the five-acre district and wanted it rezoned down to two-acre lots so he could build more houses on it. He sued the village and won at the Appellate Division. The Village of Upper Brookville appealed to New York's highest court, and in 1980 the Court of Appeals reversed that decision in Robert E. Kurzius, Inc. v. Incorporated Village of Upper Brookville, ruling that the five-acre minimum served a legitimate purpose in preserving open space and was not, on the facts presented, an unconstitutional attempt to exclude development. Kurzius petitioned the U.S. Supreme Court for certiorari. The Court declined to hear it, leaving the five-acre district intact twenty years after the village had first drawn it.

That ruling did not just settle a lawsuit. It permanently fixed the two-tier structure that still governs every listing in the village today. A two-acre parcel and a five-acre parcel in Upper Brookville are not variations on a theme. They are two different zoning products, upheld as such by the state's highest court, and each carries its own math for what can be built and what it will cost to build it.

What Two Acres Buys That Five Won't

The acreage minimum is the headline, but the code goes further than lot size. Even the portion of a lot where you are allowed to actually put a house differs by district. The village code defines a required contiguous buildable area of at least 30,000 square feet in the five-acre OP1 district, compared with at least 15,000 square feet in the two-acre R1 district. Wetlands, floodplain, steep slopes, and required setbacks all get carved out of that number first, so on a heavily wooded or sloped five-acre parcel, that 30,000-square-foot threshold can be a real constraint, not a formality.

Accessory structures follow the same split. In the five-acre OP1 district, no single detached accessory building can exceed 1,200 square feet, and the combined footprint of all accessory buildings on a lot is capped at 2,000 square feet. That number covers everything from a pool house to a detached garage to a home gym, which matters enormously if part of the appeal of buying five acres was the idea of adding a guest house down the road.

The village even scales its horse-keeping rules to acreage, which tells you how literally the code treats lot size as the organizing principle for the whole village:

• On a lot of at least five acres, an owner may keep three horses or head of livestock for the first two acres, plus one more for each additional full acre.
• On a lot of at least two acres, an owner may keep two horses or head of livestock for the first acre, plus one more for each additional full acre.
• No horses or livestock are permitted at all on a lot under one acre.

None of this is trivia. It is the reason a $2 million listing and a $5 million listing in the same village can represent two entirely different lifestyles, not just two different price points on the same product.

The Narrow Door Around Five Acres

Buyers occasionally ask whether a five-acre parcel can simply be split into smaller lots to bring the price down. Generally, no. The five-acre minimum in the OP1 district is the floor for conventional subdivision, full stop.

There is one narrow exception. Village code gives the Planning Board authority to approve a conservation or open-space subdivision on specific, already-identified parcels within the OP1 district, where clustering homes to preserve contiguous open space is judged the better outcome than a conventional five-acre-per-lot layout. Even then, the code is explicit that this authorization cannot be used to increase the number of homes beyond what conventional subdivision would already allow, and any lots created still have to meet the area and bulk standards of the two-acre R1 district as a floor. It is a tool for preserving green space more efficiently, not a workaround for density. If you are evaluating raw land in Upper Brookville with subdivision in mind, that distinction is worth confirming with the village before it factors into your offer.

Reading a Listing the Way an Appraiser Would

The practical takeaway is simple to state and easy to skip. Before you compare two Upper Brookville listings on price alone, find out which zoning district each one sits in. A two-acre R1 property and a five-acre OP1 property are going to price, appraise, and resell differently, and the village's own code is the reason why. If you are the kind of buyer who wants room for a guest house or a stable, the accessory building caps and horse allowances above tell you exactly what each acreage tier will and will not permit before you fall for a listing photo.

If you are selling, the same logic works in reverse. A five-acre estate competing against the wider North Shore market needs a longer runway to find its buyer, which the 173-day median reported this August already suggests. Pricing and marketing strategy for that kind of property look nothing like pricing a two-acre home that is more likely to move in the way the December snapshot showed.

A Few Questions Worth Settling Early

Is all of Upper Brookville zoned for five-acre lots? No. The village code sets up two residential districts, a two-acre R1 district and a five-acre OP1 district, and which one applies depends entirely on where a given parcel sits on the official zoning map.

Can a five-acre lot be legally split into two smaller lots? Not through conventional subdivision. The only path is a Planning Board-approved conservation subdivision on specific parcels already identified for that treatment, and even those must still meet two-acre R1 standards as a minimum.

Why do online price estimates for Upper Brookville vary so much? Because most tools report a single blended figure for a village that legally contains two very different housing products. A snapshot weighted toward two-acre listings will read low. A snapshot weighted toward five-acre estates will read high. Neither is wrong. Both are incomplete on their own.

If you are weighing a move to Upper Brookville, or trying to price a property that sits inside it, the zoning district matters more than the median you saw first. Karen Sharf has spent decades reading North Shore properties this way, acre by acre and district by district, and would welcome the chance to walk through what your specific parcel actually offers. Let's Connect.