Ask anyone shopping for a home in Watertown this year what's driving the market, and they'll mention the same place: Arsenal Yards. The life sciences campus, the Shake Shack, the seven-screen movie theater, the apartments filling up along the Charles River. It's the visible story, and it's a real one. Homes within a half mile of the development have appreciated 12 to 15 percent faster than the town average over the past three years, according to third-party market analysis.
The quieter story, the one that will matter more to what you pay five years from now, is happening two miles away in Watertown Square. In November 2024, the City Council approved zoning that opens the town's traditional downtown to multifamily housing by right for the first time, a change tied to the state's MBTA Communities Law. Almost nobody shopping for a home right now is pricing that change in correctly, partly because the sources describing it don't even agree on how big it is.
The Zoning Changed. The Buildings Mostly Haven't.
The state required Watertown to zone for a minimum "unit capacity" of 1,701 multifamily units around the Square, a figure confirmed on the city's own MBTA Communities Law FAQ page. Watertown went well beyond that minimum. How far beyond depends on which local source you read: a resident letter published in Watertown News in February 2026 put the town's own zoned capacity at 3,133 units, while Bisnow reported the plan includes by-right zoning for more than 4,400 units. Both numbers describe zoning capacity, not a construction forecast. The city's own FAQ is direct about this distinction: making a site buildable by right "will likely result in more housing being built, but it won't be 6,000 new units, and likely not even 1,701."
That gap between what's legally allowed and what actually gets built is the whole story for a buyer trying to time a purchase near the Square.
So far, two private projects have cleared approval under the new zoning. Torrington Properties won Planning Board approval in December 2025 for a five-story, 40-unit building at 33 Mt. Auburn Street, with one floor of ground-level commercial space. WSQ Development and Eaglebrook Capital secured approval in November 2025 for a four-story, 52-unit apartment building at 108 Water Street. A third project at 72 Mt. Auburn Street has gone through public review as well. Add it up and you get well under 150 units in active development, against a zoned capacity in the thousands. The zoning wave is real. The building wave is still mostly a rendering.
The Project That Would Actually Change the Square Is Several Years Out
The redevelopment most likely to reshape how the Square looks and functions isn't a private apartment building. It's the city's own Demonstration Project, targeting the municipal parking lot behind CVS and the surrounding parcels bounded by Spring, Summer, and Church Streets. City Manager George Proakis presented the draft plan to a full room at the Watertown Free Public Library on April 6, 2026, three days before the draft was released publicly on April 9. Both design options in the 163-page draft include a multi-story parking garage, a residential building with ground-floor retail, and a public green space, adding roughly 247 housing units.
The timeline in that draft is worth sitting with before you build a purchase decision around it. Plan adoption happens in 2026. Pre-development, meaning developer selection and financing, runs through 2026 and 2027. Acquiring the properties, which may require eminent domain and relocating current residents and businesses, is scheduled for 2027 through 2029. Design and construction follow in 2029 and 2030. The plan doesn't project the garage, retail, and housing opening until 2031.
The project has drawn genuine local enthusiasm. Sam Ghilardi of the resident group Housing For All Watertown told Banker & Tradesman, "We are thrilled with what has been proposed so far." Support is real. So is the multi-year runway between zoning approval and move-in day.
Three Submarkets, Three Different Bets
Watertown isn't one market right now. It's three, and each one is answering a different question about timing.
| Submarket | What defines it | What you're actually buying |
|---|---|---|
| East Watertown | Cambridge-adjacent, closest to Arsenal Yards and the life sciences campus | An established premium tied to a development that's already largely built and leased |
| Watertown Square | Historic downtown mixed with auto-oriented lots (tire shops, gas stations, car dealerships) now zoned for multifamily by right | Exposure to a redevelopment timeline measured in years, not months, with the marquee public project not opening until 2031 |
| West Watertown | Larger residential lots near the Belmont and Waltham lines | A quieter, more traditional single-family feel at a lower price point than the east side |
East Watertown is where you pay for certainty today. Watertown Square is where you're underwriting a timeline. West Watertown is where you're trading proximity to the Square and Arsenal Yards for more land and a lower price.
What the 2026 Transaction Data Actually Shows
Here's where the picture gets more interesting than "the market is hot" or "the market is cooling." Year-to-date in 2026, single-family homes in Watertown sold at an average of $1.11 million across 22 closed sales, down from $1.25 million a year earlier. Condos closed at an average of $802,000 across 92 sales, down from $919,000 the year before. Read quickly, that looks like a market losing steam.
It isn't, at least not in the way those averages suggest. In the same period, single-family homes sold at an average of 101.4 percent of list price, taking 25 days to get an accepted offer, with 2.3 months of supply on the market. Condos sold at 100.5 percent of list price, took 30 days to offer, and sat at just 0.8 months of supply, among the tightest inventory levels the town has seen. Both segments are still selling above asking. Both are still moving fast by any normal market standard.
The lower averages almost certainly reflect a shift in what's changing hands, not a townwide drop in value. With condos accounting for 92 of the roughly 114 combined sales this year, a heavier mix of lower-priced condo transactions pulls the blended averages down even while individual sellers are still getting bidding-war outcomes on their own listings. If you're using "average price is down" as a signal that you'll have more room to negotiate, the days-to-offer and percent-of-list numbers say otherwise.
What This Means If You're Comparing Watertown to Newton, Cambridge, or Belmont
If your plan is to wait out Watertown Square in hopes of cheaper new inventory landing near a walkable downtown, the city's own draft timeline says that's a multi-year wait for the project most likely to change the Square's character, and a much shorter but still multi-year wait for the smaller private buildings already working through construction. Waiting rarely pays off as a near-term affordability strategy here.
If proximity to an already-established amenity base matters to you now, East Watertown and the immediate Arsenal Yards area are the more predictable buy, at the premium that predictability already carries. If you're comfortable holding for the long term and want to be early on streets where private capital is already moving, Mt. Auburn Street has seen two of the first three private projects under the new zoning, which is a real signal, though the city's own language is clear that zoning capacity is not a construction guarantee.
Either way, the offer strategy should match what the percent-of-list and days-to-offer numbers are actually saying this year, not what a falling average price implies.
A Few Questions Worth Asking Before You Write an Offer
Is Watertown Square about to get significantly more affordable housing? Not on any timeline that helps a buyer shopping in 2026. The city's own draft plan for its largest Square redevelopment doesn't project completion until 2031, and the two smaller private projects approved so far add fewer than 100 units combined.
Does the new zoning guarantee that Watertown Square will get built out? No. The city's FAQ is explicit that unit capacity describes what's legally allowed, not what will be constructed. Plenty of by-right sites could remain tire shops and gas stations for years.
Should I pay the Arsenal Yards premium now or wait for the Square? These are different bets on different timelines. Arsenal Yards is an established premium you're paying for today. The Square is a speculative, multi-year story that hasn't been priced into most listings yet, for better or worse.
If you're weighing Watertown against Newton, Cambridge, or Belmont and want help reading a specific listing against these timelines, Neran Rohra can walk through the numbers with you street by street. Let's Connect.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
