"We can't afford to let approved projects that are ready to build remain stalled because of today's tough economic headwinds," Mayor Michelle Wu said in the City of Boston's September 15 announcement. The announcement proposed temporary property tax relief for four approved housing developments that hadn't broken ground. One of the four is One Mystic Avenue, across from Sullivan Station. It is also the only project in Charlestown's pipeline with a large block of new condominiums.
If you're comparing Charlestown with other Boston neighborhoods, that tax deal has more to do with your choices than the median price does. Charlestown has thousands of homes in planning. Almost none are for sale, and the one project that would add new condos at scale can't be financed without help from City Hall. For the next several years, a Charlestown condo buyer will be choosing among resale listings. That resale inventory grew noticeably this year.
Most of the Pipeline Is Rental
New construction usually takes pressure off a condo market by giving buyers an alternative to the existing stock. In Charlestown, most of what's being built or approved won't be sold to an owner-occupant at all.
| Project | Homes | Tenure | Status |
|---|---|---|---|
| Stellata, Bunker Hill redevelopment Building M | 102 | Rental, all affordable replacement housing | Delivered January 2025 and fully occupied |
| Bunker Hill redevelopment Building F | 266 | Rental: 208 market-rate, 58 affordable | Broke ground April 28, 2026, with an 18-month construction period |
| 201 Rutherford Avenue, first phase of the Bunker Hill Mall redevelopment | 240 apartments, 48 income-restricted | Apartments | BPDA-approved April 16, 2026, no construction date published |
| One Mystic Avenue | 202 rentals and 221 condos under the 2025 approval | Mixed | Approved, not yet under construction |
Building F is the project that is actually rising. The Boston Housing Authority describes it as a nine-story building developed with Leggat McCall Properties and the Joseph J. Corcoran Company. In the city's September release, BHA Administrator Kenzie Bok said "rapid construction is underway" and credited the city's $110 million Housing Accelerator Fund. The full Bunker Hill redevelopment is planned as 15 residential buildings, and BHA says the rest will be built over the next decade.
All of that adds to Charlestown's rental supply. Building F and 201 Rutherford Avenue will change what renters can choose from. Neither one adds a single condo.
What One Mystic Avenue Needs Before It Can Start
That leaves One Mystic Avenue, developed by Fulcrum Global Investors, as the only large source of new for-sale housing. In September 2025, the BPDA approved a revised plan with 423 homes in an 18-story building: 202 rentals and 221 condominiums. The city's September 2026 announcement describes it differently, as 408 homes in a 16-story building with 45 income-restricted units, a $14 million contribution to the city's Inclusionary Development Policy (IDP) fund, and a design that would make it one of the largest Passive House buildings in Boston. The Charlestown Patriot-Bridge's 2025 report estimated that payment at about $18 million. The final unit count will come from whatever is permitted and built. Under either version, the condos are a little over half the building.
At an October 7 public meeting on the project's Chapter 121B agreement, city staff said the project's total development cost would exceed $300 million and that it wasn't financially positioned to begin construction. They pointed to construction costs up 38% and interest rates up 69%. City staff also said no changes to the project itself were being proposed as part of the tax application.
The steps from here run in order, and each one has to happen before the next:
- The tax proposal goes public. The city proposed the abatements on September 15, 2026, and opened a 30-day comment period. The comment period on One Mystic's application closed October 14.
- The BPDA Board backs it. According to Banker & Tradesman, the board supported the four agreements at its October meeting.
- The Assessing Department negotiates the payment-in-lieu-of-taxes (PILOT) agreement. Banker & Tradesman calls this the final step, and it hasn't happened yet.
- The developer secures financing and breaks ground. The relief depends on construction starting within the agreed timeframe. According to Banker & Tradesman's September 14 report, the target is a 2027 start.
The relief itself defers taxes rather than forgiving them. Banker & Tradesman reports that the property's taxes would stay at current levels through construction and then rise over five or ten years once a certificate of occupancy is issued. The city puts the total for all four projects at about $31.5 million, roughly $22,500 per unit, and says it expects no net revenue loss. The city's tax agreements page explains how these payment schedules work in general.
No completion date for One Mystic Avenue has been published. The surrounding roads will also take time. The city's Rutherford Avenue and Sullivan Square redesign was still in pre-25% design in May 2026 and lists 2035 as its expected completion year.
Resale Inventory Is Already Rising
With new condos years away, resale listings are what move the Charlestown condo market. The Massachusetts Association of Realtors' September 2026 Charlestown report shows more of them.
| Charlestown condos | 2025 | 2026 | Change |
|---|---|---|---|
| New listings, January–September | 156 | 187 | +19.9% |
| Closed sales, January–September | 123 | 122 | -0.8% |
| Median sale price, January–September | $980,000 | $949,000 | -3.2% |
| Homes for sale, end of September | 23 | 35 | +52.2% |
| Months of supply, September | 1.7 | 2.7 | +58.8% |
| Share of original list price received, September | 95.6% | 96.9% | +1.4% |
Through September 2026, sellers listed about 20% more condos than they did in the same period of 2025, while closings stayed almost exactly level. Buyers absorbed nearly the same number of homes as last year, 122 compared with 123, and the extra listings built up as inventory. That's why months of supply rose from 1.7 to 2.7 in a year, and why the year-to-date median slipped 3.2% to $949,000.
Demand hasn't gone away. Pending condo sales in September 2026 were 16, up from 10 a year earlier. Days on market fell to 41 from 61, and the September median of $810,000 was essentially flat with September 2025. Pricing has changed more than demand. Year to date, condo sellers have received 100.1% of their original list price on average. In September alone, that dropped to 96.9%. MAR warns that a single month can look extreme because of small sample sizes, and September had 13 condo closings. The year-to-date numbers are the steadier read. The September figures show where the season ended.
What This Means on Each Side of a Deal
If you're buying
Because no new condo tower is close to delivering, a Charlestown condo search this fall or next spring is a resale search. More choice is coming from existing owners listing, and a buyer has room to negotiate on homes that were priced for the spring market. If you're waiting for One Mystic Avenue's 221 condos to soften prices, you're waiting on a PILOT agreement, construction financing and a groundbreaking that hasn't been scheduled. If you're comparing Charlestown with another neighborhood, compare the resale inventory in each, because that's the stock you'll actually be choosing from.
If you're selling
You aren't competing with a developer's sales office, so you won't be priced against brand-new units with incentives attached. You are competing with 35 other condo listings, compared with 23 a year ago. September's 96.9% of original list price points to the cost of listing too high this season. Spring comparables won't match the current inventory, so pricing for today's level of competition is what produces offers in the first weeks a home is on the market.
FAQ
Is One Mystic Avenue under construction? No. The BPDA Board backed its tax agreement in October 2026, but the Assessing Department still has to negotiate the PILOT agreement, and the stated target is a 2027 construction start.
Does the tax deal change taxes for current Charlestown homeowners? The city's proposal covers the four named projects. It says developers would keep paying at least what they pay today and that the city would see no net revenue loss.
When is Building F expected to finish? The Boston Housing Authority announced an 18-month construction period starting with the April 28, 2026 groundbreaking. It hasn't published a firm completion date.
Are more projects likely to get similar tax deals? According to Banker & Tradesman, up to 12 more projects could be eligible. The city has also identified 47 approved projects of at least 100 units that haven't started construction.
If you own a Charlestown condo and want to know how it compares with the 35 other listings it would be up against this season, Georgia Balafas can prepare a pricing strategy based on current resale competition rather than last spring's comparables. Request Your Home Valuation, and you'll get a number built for this market.
