Pull up Williamsburg's market data as it stood in June 2026 and you get whiplash. Condo prices were up 13.4% year over year, to a median of $1.6 million. Co-op prices were down 21.6% year over year, to a median of $410,000. Single-family houses were up 92.1%, to $4.6 million. Same neighborhood. Same month. Same data provider.
If you're comparing Williamsburg to another Brooklyn neighborhood, or trying to decide whether a co-op or a condo makes more sense here, those three numbers look like three separate markets. They aren't. They're one small, thin dataset getting sliced by property type, and only one of those swings is telling you something true about where value actually moved.
The Same Report, Three Contradictions
Start with the scale of what's being measured. A total of 65 properties traded in Williamsburg in June 2026, up 22.6% from a year earlier. That's the entire month's closed activity, split across condos, co-ops, and houses. Divide 65 sales three ways by property type and you get small buckets, the kind where one or two unusual closings can swing a median hard without any building actually changing in value.
Now look at the number least distorted by which specific units happened to close that month: price per square foot. Williamsburg's median in June 2026 was $1,447 per square foot, up just 0.3% year over year. If the neighborhood's underlying value had genuinely swung by double digits in either direction, the per-square-foot figure would have moved with it. It barely moved at all.
Sixty-five sales, split three ways, in a month where price per square foot held almost flat. That's not two markets diverging. That's a small sample doing what small samples always do: swinging hard when a handful of transactions land in one bucket instead of another.
Why the Co-op Number Is the Least Trustworthy One
Williamsburg's co-op stock is thin to begin with, and it's concentrated in a specific type of building: small, pre-war walk-ups scattered on inland blocks, many of them structured as HDFC cooperatives. HDFC co-ops carry income caps for buyers and their own flip tax rules, and by design they resell well under market rate. If even two or three HDFC units close in the same month as an ordinary market-rate co-op resale, the reported median takes a hit that has nothing to do with Williamsburg co-ops losing value across the board. It reflects which specific units happened to close.
Layer onto that the closing costs a raw median never shows. Brooklyn co-ops typically charge a flip tax of 1% to 2.5% of the sale price, paid by the seller, and Williamsburg buildings tend to sit toward the higher end of that range. That's before board approval timelines, subletting restrictions, and post-purchase liquidity requirements, all of which shape what a co-op actually costs to buy and sell here, and none of which shows up in a single median-price line.
The Waterfront Kept Building. The Walk-ups Didn't.
The condo side of the ledger moved for a structural reason: new trophy inventory keeps resetting the ceiling. At 8 South 4th Street, the 45-story Two Trees tower built in 2024 with 160 units, Penthouse 1A sold for $7.5 million, or $3,046 per square foot, a record at the time. At One Domino Square, Penthouse 3A entered contract for $7 million, or $3,313 per square foot, setting the area's new top price per square foot on the waterfront. Every time a sale like that closes, it pulls the condo median up with it, even though most Williamsburg condo buyers aren't shopping in that tier.
That pipeline isn't slowing down. Two Trees' River Ring project on the Williamsburg waterfront secured an extension of the 421-a tax break in the 2026 state budget, qualifying for the program even though the project will miss its original 2031 completion deadline. New waterfront supply keeps getting built, and keeps getting a tax incentive to finish.
Meanwhile, the inland pre-war stock isn't expanding to match it. In February 2026, a portfolio of five renovated pre-war multifamily buildings changed hands in a $19 million financing deal, including two in Williamsburg: a pair of four-story buildings at 431-433 Wythe Avenue built around 1920 with 16 units combined, and a four-story building at 313 South 4th Street built around 1915 with roughly 12 units. That's the scale of building Williamsburg's older housing stock is made of, small, century-old, and not being replicated. Nobody is putting up new 12-unit walk-ups to compete with a 45-story tower. The co-op and pre-war segment is fixed in size, so its median is far more sensitive to which specific units happen to trade in a given month.
What This Means If You're Weighing Co-op Against Condo Here
The headline numbers from any single month tell you less than they appear to. A few things matter more:
- Pull the specific building's closed comps from the last 12 months, not the neighborhood median. A thin, aging co-op stock means the citywide or neighborhood-wide number can move for reasons that have nothing to do with your building.
- For a co-op, ask for the proprietary lease, the flip tax schedule, and whether the building is HDFC-restricted before you compare its asking price to anything else. Those documents tell you more about true cost than a median ever will.
- For a new-construction condo, ask what floor and exposure drove the price per square foot. The same building can span a gap of hundreds of dollars per square foot between a low floor and a high floor with river views.
- Confirm whether the specific unit or building carries a 421-a abatement and how many years remain. That number changes your carrying cost more than the headline sale price does.
None of this means Williamsburg co-ops are secretly a bargain, or that condo buyers are overpaying by 13%. It means the two segments are structurally different products with different transaction friction, and a single month's median is the wrong tool for comparing them.
Does this mean Williamsburg co-ops are a real bargain right now? Not automatically. Co-ops here do trade at a discount to condos for reasons that hold regardless of any single month's numbers: board approval, subletting limits, and flip tax. The 21.6% year-over-year drop reported for June 2026 reflects which specific co-ops closed that month more than it reflects a fresh discount opening up. Judge each building on its own financials before assuming the headline number applies to it.
What's an HDFC co-op, and why does it keep showing up in this data? An HDFC co-op is an income-restricted cooperative created to preserve affordable ownership, with resale price caps or buyer income limits and its own flip tax structure that can differ sharply from a market-rate building. Williamsburg has a meaningful concentration of these older buildings, and because HDFC resales are priced well under market rate by design, a single HDFC closing can move a small monthly co-op sample far more than one market-rate sale would.
Reading a neighborhood's numbers correctly, rather than reacting to the headline, is the difference between a good offer and an expensive mistake. If you're comparing a Williamsburg co-op against a waterfront condo and want someone to pull the actual building comps, flip tax schedule, and abatement timeline before you write an offer, the Schier Cloonan Team can walk through the specific numbers with you. Request a complimentary home valuation and get a read on what a given building's financials actually say, not just what the neighborhood median implies.
