Chestnut Hill Is Two Towns Wearing One Name, and the Gap Just Got Wider

"I felt pretty good, but I wasn't expecting it to that extent, certainly." That's how Cliff Kensington, City Realty's chief development officer, described watching Brookline's Town Meeting approve zoning for his company's Route 9 redevelopment by a vote of 217 to 20 on May 28, 2026. Even the developer who negotiated that outcome for years didn't expect it to clear by that margin.

For anyone comparing Chestnut Hill listings this fall, that vote is worth understanding, not because of what it means for one project's construction schedule, but because of what it exposes. Chestnut Hill isn't a single real estate market wearing one name. It's two towns, Newton and Brookline, divided by Boylston Street, each running its own tax structure, its own historic district rules, and, as of this spring, a zoning outcome that only one side of that street actually experiences.

The Boundary Problem Buyers Don't See Coming

Search listings and you'll find "Chestnut Hill" attached to homes in Newton, homes in Brookline, and a smaller cluster near the Boston line. The label doesn't tell you which town you're in, and that omission matters more than it should.

Brookline's Chestnut Hill Historic District was listed on the National Register of Historic Places on October 17, 1985. It runs roughly from Middlesex Road on the north to Reservoir Lane on the east, down to Crafts Road and Route 9 on the south, and out to Dunster Road on the west. A short walk away, across the town line, sits Newton's Old Chestnut Hill Historic District, centered along Hammond Street. These are two separate designations administered by two separate town governments, and they don't share a review process. A buyer planning an addition or a significant renovation needs to know which board they'll be answering to before they write an offer, not after.

The same confusion extends to the small slice of Chestnut Hill that falls inside the Boston city line, where the applicable public school system changes even though the streetscape looks the same.

What the May Vote Actually Changes, and What It Doesn't

The site at the center of this spring's zoning fight is 1280-1330 Boylston Street, a 5.34-acre former office park that City Realty bought for $41 million in May 2024. The approved plan calls for three buildings, up to 14 stories, combining a roughly 200-room hotel, about 266 residential units, medical office space, and ground-floor retail. More than half the project's floor area is required to stay commercial, a condition the town built in deliberately after years of relying on residential rezoning to fill Brookline's budget gaps.

That condition exists because of leverage most buyers never hear about. When the town's rezoning study process dragged on without a clear timeline, City Realty began the process of filing for a Chapter 40B project eligibility letter, the state mechanism that lets developers bypass local zoning in communities below the state's affordable-housing threshold. Town officials and the developer both confirmed the filing wasn't a bluff, it was a real path City Realty was prepared to take if the zoning process stalled again. The May vote wasn't Brookline choosing density. It was Brookline choosing to keep design control over a project it was going to get one way or another.

None of that means a crane shows up next spring. Kensington has said publicly that the project won't break ground before spring 2028 at the earliest, and that estimate assumes permitting, design review, and financing all move without a hitch, which is not the current environment for large-scale construction in the Boston area given elevated interest rates and construction costs. As of late August 2026, the project has moved into design review, one step past the zoning approval and still several steps from a shovel in the ground.

The Two Chestnut Hills, Side by Side

The Tax Rate Illusion

Newton's headline number looks like the better deal. At $9.69 per $1,000 of assessed value against Brookline's $10.24, a quick glance suggests Newton wins on carrying cost every time. It doesn't hold up once you factor in the exemption Brookline offers and Newton doesn't.

Brookline's residential exemption knocks $354,974 off a qualifying owner-occupant's assessed value before the tax bill gets calculated, worth roughly $3,635 a year at the current rate. Newton has no equivalent broad exemption for owner-occupants. It offers targeted relief for seniors, veterans, surviving spouses, and blind residents, with applications due to the Board of Assessors each April 1, but nothing that reaches every owner-occupied home the way Brookline's does. Run the math on two otherwise comparable Chestnut Hill properties and the gap between headline rates narrows or disappears once the exemption applies.

That gap is also not fixed. Brookline officials floated an override of almost $24 million earlier in 2026, reported at the time as potentially the largest in state history, and voters approved an override that spring to close a structural budget shortfall. Anyone underwriting a Brookline-side purchase should build in a conservative assumption for future increases rather than treating this year's rate as the steady state.

Before You Compare Chestnut Hill Listings Side by Side

A few habits separate an informed comparison from a portal-driven guess.

• Confirm which town holds the address, Newton or Brookline, before comparing tax bills or price history. The name on the listing won't tell you.
• Ask which historic district review board, if either, would govern a planned renovation or addition, since the two towns run separate processes with different standards.
• If a listing sits within a few blocks of Route 9 near Hammond Street, ask whether the seller's disclosure addresses the City Realty rezoning and its design review status.
• Apply the Brookline residential exemption to any side-by-side tax comparison rather than relying on the headline rate alone.
• Treat a 2028 construction timeline as a multi-year planning horizon, not an immediate disruption to daily life or resale value.

A Few Questions Worth Asking Directly

Does the Route 9 project affect homes on the Newton side of Chestnut Hill? No. The zoning approved on May 28, 2026 covers a specific overlay district on the Brookline side of Route 9. Newton's Zoning and Planning Committee was briefed on the proposal in March 2026 because the two towns share traffic infrastructure along that corridor, but Newton did not vote on or adopt any related zoning changes of its own.

Will my property tax bill change because of this development? Not directly and not immediately. Town officials framed the rezoning primarily as a way to grow commercial tax revenue over time, which could ease pressure on future town budgets. Any change to an individual homeowner's bill would come through the normal assessment cycle, not as a line item tied to this specific project.

How soon will construction actually start? Not before spring 2028, according to City Realty's own public timeline, and that assumes permitting, design review, and financing proceed without delay in a construction environment that has been slow across Greater Boston.

Chestnut Hill's appeal has never been in question. What deserves more scrutiny is the assumption that it behaves like one market. It doesn't, and the gap between its two halves just became easier to measure. If you're weighing a Chestnut Hill purchase or sale and want the town-by-town detail that a portal listing won't give you, Joan Solomont offers a complimentary market consultation built around exactly this kind of local detail.