Pull up a triple-decker in Magoun Square on two different sites this spring and you will get two different stories about what happened to its value over the past year. One index says the neighborhood gained close to 12 percent. Another, built from actual closed sales, says the median dropped by almost the same amount. Neither is wrong. They are measuring different things, and the gap between them is the most useful piece of market information a Somerville buyer or seller can have in 2026.
This is not a Magoun Square quirk. It is a symptom of a bigger problem with how Somerville's market gets reported, and once you see it you cannot unsee it in every citywide headline about this city.
The Same Address, Two Different Stories
In February 2026, homes in Magoun Square sold for a median price of $928,000, down 11.7 percent from a year earlier. Days on market nearly tripled, moving from 13 days to 36. Only 10 homes changed hands that month, up from 3 the year before.
Meanwhile, a separate home value index for the same square puts the typical property at roughly $832,000, up 11.8 percent over the same twelve months.
A median sale price built from 10 closed transactions is not a stable number. It is whatever those 10 sellers happened to be selling that month, whether that was three renovated condos or seven older triple-deckers in need of work. A smoothed valuation index tries to correct for that by tracking the same types of homes over time rather than whatever happened to close. Both approaches are legitimate. Neither one, read alone, tells you what your specific property is worth. That is the lesson, and it applies well beyond one square.
Somerville's Citywide Number Can't Decide What It's Doing Either
Zoom out to the whole city and the contradictions keep coming. Over the three months ending May 2026, Somerville's median sale price sat at $1.0 million, down 4.6 percent from the same period a year earlier, with price per square foot up 8.4 percent over that stretch. The same report shows the average house price for the most recent single month up 7.4 percent year over year, a different slice of the same market telling a different story.
A different tracker put Somerville's median sale price at $952,000 as of March 2026, essentially flat, down just 0.16 percent, with homes moving in about 22 days and selling at 99.8 percent of asking price. Roughly a third of homes were still selling above asking, down from more than half the year before. A third source showed the citywide median list price at $969,000 in August 2026, down 2 percent from August 2025.
Down 4.6 percent. Flat. Down 2 percent. Up 7.4 percent. These are not competing opinions about the same market. They are accurate readings of a market that is genuinely doing different things depending on which slice you measure, and a citywide median blends all of it into one number that describes no actual transaction.
The Split That Actually Matters: Property Type, Not Portal
Here is where it gets useful instead of just confusing. A market update built from closed MLS PIN sales through the end of March 2026 broke Somerville out by property type, and the divergence is sharp:
- Single-family homes averaged $1.64 million year to date, a significant increase over the prior year, with about 52 days on market and roughly 99 percent of list price at closing. Inventory was rising, not falling, which is unusual for a segment still gaining value this fast.
- Condos averaged $921,000, a modest decline from the year before, with about 61 days on market and over 70 active listings. Days on market improved even as prices softened, which suggests well-priced units still found buyers quickly while overpriced ones lingered.
- Multi-family properties averaged $1.49 million, with sales volume down significantly and pricing softer than the year before, at about 50 days on market and roughly 97 percent of list price.
Read the citywide median against this and it makes sense why nobody can agree on a single number. If single-family sales climb while multi-family sales stall and shrink in volume, the blended median will bounce around based on nothing more than which property type happened to trade more in a given month. That is not a market crashing or booming. It is three markets sharing one ZIP code.
The Green Line Explains The Divergence
The reason this split lines up the way it does is not random. It tracks the Green Line Extension almost exactly.
Union Square gained Green Line service on March 21, 2022. Ball Square and the Medford Branch followed on December 12, 2022. Since then, new construction has landed hardest right at those stops. Prospect Union Square, a 450-unit building at 20-50 Prospect Street designed by Höweler + Yoon and certified LEED gold, has been leasing near the Union Square stop since 2023, and the city opened applications this past July for four income-restricted studio units there through its Inclusionary Housing Program. Near Ball Square, a 42-unit apartment building called The Sphere added new rental stock right in the square. Near Magoun, the Windsor at Maxwell's Green development sits a short walk from the station. All of that supply is condo and apartment product, not multi-family triple-deckers.
Multi-family stock in Somerville skews toward older, non-station neighborhoods like Winter Hill, where the buyer pool is smaller and the properties often need more work before they can command top dollar. That is exactly the segment showing softer pricing and thinner sales volume in 2026. The new construction near the T stations is diluting condo comps with fresh, amenity-heavy inventory, while multi-family sellers further from a station are competing in a market with less urgency and fewer buyers chasing the same handful of listings.
The market isn't confused. It's telling you where the new supply landed, and it isn't in the multi-family column.
What This Means If You're Pricing A Multi-Family
If you own a two or three family in Somerville and you are watching the citywide median for a signal on when to list, stop. That number is being pulled around by single-family and condo activity that has nothing to do with your building.
Pull comps specifically within multi-family sales, and specifically within your part of the city, from the last 90 days. If your property sits outside the immediate GLX corridor, expect a longer marketing timeline than the citywide average suggests, and price with that in mind rather than chasing a number set by a different property type entirely. We wrote a full pre-listing playbook for exactly this situation, and if you're weighing whether a condo conversion still pencils against a straightforward as-is sale, that math has changed enough since last fall that it deserves its own look.
What This Means If You're Comparing Squares As A Buyer
If you are choosing between squares, do not compare a single citywide figure to your target neighborhood. Compare property type to property type, square to square, and check whether the number you are looking at is a closed-sale median from a thin sample or a smoothed valuation index. A single-family home in Ball Square and a condo in Magoun Square are not the same asset even though they share a city, and treating them as comparable data points is exactly how buyers talk themselves into overpaying or underbidding.
Proximity to a Green Line stop still commands a premium four years after the trains started running, but it shows up differently by property type. New condo stock near Union and Ball has absorbed most of the recent construction. Older multi-family stock further out is where the negotiating room actually sits right now.
FAQ
Why do two sites show opposite trends for the same Somerville neighborhood? One is usually a median built from a small number of actual closed sales in a given month, which swings hard based on the mix of homes that happened to sell. The other is typically a smoothed valuation index designed to track the same type of property over time. Both can be accurate and still tell opposite stories.
Is Somerville a buyer's market or a seller's market in 2026? It depends entirely on the property type. Single-family homes are still moving fast with rising prices. Condos have softened modestly but still move quickly when priced right. Multi-family sales have slowed the most, with fewer transactions and more room to negotiate.
Does the Green Line Extension still matter for pricing four years after it opened? Yes, but its effect is concentrated in new condo and apartment construction near the stations rather than lifting every property type equally. Multi-family stock away from the stations has not seen the same benefit.
If you own a Somerville multi-family and want a pricing conversation grounded in your actual property type and square rather than a citywide headline, Encompass Property Solutions can walk through your specific comps. Start with a home valuation or reach out to schedule a consultation.
