If you're comparing Somerville squares by assuming "new Green Line stop" is shorthand for "safe investment," the numbers from this spring should give you pause. Ball Square, the quietest of the five station areas added by the Green Line Extension, carries a Zillow home value of $988,167 as of May 2026. Union Square, the stop that absorbed the most redevelopment attention, city planning, and press coverage, sits at $882,563 over the same window. The neighborhood that got the least hype is outpricing the one that got the most.

That's roughly a $105,000 gap between two station areas that received the same transit investment on the same rough timeline. If you're weighing where to buy near Somerville's newest T stops, that gap is worth understanding before you buy into the easier version of the story.

The Same Extension, Five Different Price Tags

The Green Line Extension opened in two phases in 2022, adding five new Somerville stations: Union Square, East Somerville, Gilman Square, Magoun Square, and Ball Square. Every one of those stops now runs the same trains on the same schedule to the same downtown job centers. If proximity to rail were the only variable that mattered, home values across the five station areas would track close together. They don't.

Davis Square isn't part of the Green Line Extension. It's been a Red Line transit hub for decades. I'm including it because it shows what a fully matured, amenity-dense station area is worth in this market, and it puts Ball Square's number in context. Ball Square isn't just doing well for a new GLX stop. It's within striking distance of Somerville's gold standard, largely because it sits close enough to borrow Davis Square's gravity without carrying Davis Square's full price tag.

Why Ball Square Is Outperforming a Stop With More Hype

Ball Square never got the plaza redesigns, the acreage of new public space, or the mixed-use pipeline that Union Square did. What it had going for it before the trains ever arrived was proximity. It sits a short walk from Davis Square, long established as one of the city's most walkable, food-and-retail-dense squares. Adding a Green Line stop on top of that existing walkability didn't create demand from scratch. It gave demand that already existed one more reason to concentrate there.

That's the pattern worth remembering when you're pricing a station area: a new stop amplifies whatever was already drawing people to a block. It doesn't manufacture desirability on its own.

Union Square's Investment Hasn't Fully Converted to Price

Union Square is, by any planning measure, the busiest corner of the GLX story. City materials describe it as Somerville's oldest commercial district and the historic and social center of the neighborhood. The redevelopment plan tied to the station aims to add jobs, housing across a range of affordability, and more than an acre of new public plaza space, with the stated goal of prioritizing people over through-traffic. The square's identity as a small-business and startup corridor predates the extension. Bow Market's cluster of small storefronts, Union Square Donuts, and The Independent all give the area a retail identity that Ball Square and Magoun Square are still building toward.

None of that has translated into the area outpricing its quieter neighbor a mile up the line. One explanation: Union Square's price already absorbed a large share of anticipation before the trains started running. Home prices across Somerville rose 40 percent between 2016 and 2021, largely on the strength of the extension's approach, and Union Square, as the flagship stop, likely carried more of that speculative premium into its baseline than Ball Square did. When a big part of a station's value gets priced in ahead of delivery, the post-opening trajectory has less room to surprise on the upside.

East Somerville's Timing Problem

East Somerville is where the gap between visible investment and current price is sharpest. The city's 90 Washington Street site, a nearly four-acre parcel steps from the East Somerville station at the intersection of Union Square, Brickbottom, and East Somerville, went out for a redevelopment RFP in February 2026. The Glen/Otis neighborway project is underway to better connect homes, schools, and businesses to the station and to Broadway. On paper, East Somerville looks like the next phase of the same story that already played out in Union Square.

The recent sales numbers tell a different story. Over the three months ending May 2026, the median sale price in East Somerville was $935,000, down 7.5 percent from the same period a year earlier, with homes taking an average of 29 days to sell, up from 17 days the year before. That's not collapse. It's a neighborhood absorbing active construction, planning uncertainty, and a still-forming retail identity all at once, and current buyers are pricing in that friction rather than the promise of what East Somerville could become in five years.

This is the trap worth naming directly: buying into "the next Union Square" while a neighborhood is mid-transformation often means buying into the disruption phase, not the payoff phase. If the payoff comes, it tends to show up later, after construction wraps and retail catches up to housing.

Magoun and Gilman Squares Are Still Writing Their Identity

Magoun Square carries a Zillow home value of $860,706 as of May 2026, the lowest of the Medford Branch stops with a clean published figure. It's a quiet, historic corner of the city. The Adams-Magoun House, built around 1783, still stands near the square and takes its name from John Calvin Magoun, a Somerville landowner who once farmed the land between Broadway and Vernon Streets. That history hasn't yet converted into the kind of dense retail identity that commands a Davis Square-style premium.

Gilman Square doesn't have a clean neighborhood-level home value figure published, but the pattern on the ground matches its neighbors. The station area won a New Urbanism award for turning what had been a car-oriented intersection into a human-scaled, pedestrian-first design, and renovated multi-family properties near the square are asking well above a million dollars, evidence that quality construction still commands a premium even where the surrounding commercial strip is thin. Gilman's public-realm investment has outpaced its retail buildout so far.

For a buyer, both squares currently offer something Union Square and Ball Square don't: a lower entry price for the same train, with room to benefit if either square's retail and dining scene catches up to its transit access over the next few years.

What the Divergence Actually Tells You

Somerville's citywide numbers don't even agree with each other cleanly right now, which is its own warning against shopping by headline stat. Redfin's rolling data shows the citywide median sale price down 4.6 percent year over year over the three months ending May 2026, while separate market commentary this year has put Somerville's Q1 2026 price appreciation at 8.4 percent, second-fastest in Greater Boston behind Cambridge. Both can be technically defensible depending on the window and the property mix being measured. Neither tells you what a specific station area is doing.

If you're deciding between Somerville's GLX stops, the station-level data suggests a more useful checklist than "does it have a T stop":

• Does the square already have an established retail and dining identity, or is that identity still being built alongside the housing?
• Is the area currently under active construction or planning review, and does that match your timeline for living there comfortably?
• Has anticipation of transit access already been priced into recent sales, or is the stop still relatively new to the market's attention?

None of that shows up in a citywide median. It shows up when you compare one square's recent closed sales to its neighbor's, one at a time.

Frequently Asked Questions

Does a new T stop automatically raise home values nearby? Not on its own. Ball Square and Union Square received the same Green Line Extension investment, and their May 2026 home values differ by more than $100,000. Existing walkability and retail density around a stop appear to matter more than the presence of the stop itself.

Is East Somerville a bad place to buy right now? The recent data shows softer pricing and longer time on market compared to a year earlier, which reflects a neighborhood in active transition rather than a neighborhood in decline. Buyers with a longer time horizon may find more room to negotiate there than in Ball Square or Davis Square.

Which Somerville GLX stop currently offers the most value for the price? Based on May 2026 figures, Magoun Square has the lowest published home value among the stations with a clean Zillow figure, at $860,706, while still offering direct Green Line access.

If you're trying to figure out which Somerville station area actually fits your budget and your timeline, that's a conversation worth having before you start touring. Mike Cohen has spent years tracking exactly these block-by-block differences across Somerville, Cambridge, and Medford. Schedule your free home consultation to talk through what the current numbers mean for your specific search.