In February 2025, a two-bedroom house at 7 Sunset Drive in Millburn sold for $965,000, 21 percent over its asking price, after competition from more than a dozen buyers. The buyer was a construction firm, Vantage Builders LLC, and it had no intention of living there. Within weeks the house came down. Eighteen months later, the same 0.26-acre lot is finishing a 5,900-square-foot, six-bedroom, six-and-a-half-bath home with Hardie shingle and board-and-batten siding, Azek trim, and Pella triple-paned windows, expected to list for close to $3 million.
Read the story on its face and it looks like a bidding war over a house nobody planned to keep. It wasn't really a bidding war over the house. It was a bidding war over a number the town's own tax rolls have not caught up to yet, and that gap explains more about how Millburn and Short Hills are pricing right now than any median sale figure on its own.
The land is scarcer than the houses sitting on it
Builders are not chasing modest older homes in Millburn because they like the floor plans. They're chasing them because there is almost nowhere else to build. Single-family housing supply across Essex County dropped 9.3 percent year over year to just 633 available homes as of July 2026, a 2.3-month supply against the roughly six months that's typically considered a balanced market, with homes selling in a median of 26 days. Sellers in the county received an average of 111.9 percent of their original asking price that same month, the highest list-to-sale ratio of any county in New Jersey.
At the top of the Millburn and Short Hills market, that scarcity shows up directly in price. Luxury single-family homes priced between $2 million and $10 million-plus hit a median sales price of $2.537 million in June 2026, up 36.2 percent year over year across 32 closed transactions. Builders reading those numbers don't see a housing shortage. They see a construction pipeline with no available lots, which makes an outdated two-bedroom on a good-sized parcel worth far more as raw land than as a house.
The pattern isn't confined to one address. A comparable deal closed in Short Hills in March 2025, when a 2,385-square-foot 1948 Cape Cod sold for more than $620,000 above asking in five days, with the buyer's intent to demolish and rebuild clear from the outset. Two separate deals, two different builders, the same math: pay a premium for the dirt, not the structure.
The part of the math the listing sheet doesn't show
Here's the piece that rarely makes it into a sale story. Millburn's last town-wide property revaluation happened in 2017, and the next one isn't expected until around 2029. The 2025 certified tax rate is $2.019 per $100 of assessed value, and the township's average residential assessment of roughly $1,302,529 produces an average annual bill of about $26,298.
When a home gets rebuilt or majorly renovated in the years between revaluations, the assessor doesn't simply price the new square footage at today's market rate. The added value gets indexed back to 2017 levels, so a rebuilt home is treated, for tax purposes, as if its improvements had existed at the baseline year rather than the year they were actually completed. The bill rises, but it rises against an old yardstick, not the price a buyer would pay for the finished home today.
Run that against the Sunset Drive numbers and the gap becomes concrete:
| Assessed under Millburn's 2017 baseline (current practice) | Assessed at true 2026 market value (hypothetical) | |
|---|---|---|
| Approximate home value | Township average, about $1.3 million | New construction, roughly $3 million |
| 2025 tax rate | 2.019% | 2.019% |
| Estimated annual bill | About $26,300 | About $60,600 |
That second column is not what any specific homeowner is currently billed. It's what a $3 million home would owe if New Jersey assessed rebuilds at their real, current value rather than indexing them back to 2017. Until Essex County orders Millburn's next revaluation, likely no earlier than 2029, a newly finished home in that price range is far more likely to sit closer to the township average than to the hypothetical figure a true reassessment would produce. That difference, more than the finished kitchen or the extra bedrooms, is what the crowd of bidders at Sunset Drive was actually competing for: a house-shaped way to hold Millburn land at a valuation the assessor hasn't priced yet.
This isn't an abstract accounting exercise. Millburn mailed its final 2026 and preliminary 2027 tax bills on September 16, five days before this was written, which is a reasonable moment for anyone comparing towns to actually pull their own township's assessment history and see where their target property sits relative to the 2017 baseline.
The township is capping the other half of the trade
None of this means every teardown candidate scales the way Sunset Drive did. Millburn updated its zoning code in June 2026 through Ordinances 2645-23, 2646-23, and 2756-26, refining how Floor Area Ratio is calculated and tightening enforcement of front-yard setbacks, specifically to control home size and preserve neighborhood scale. A 5,900-square-foot house on a 0.26-acre lot reflects what that particular parcel's zoning allowed. On a smaller or more constrained lot, the current FAR ceiling may not permit the same footprint, regardless of what the buyer's construction budget can absorb.
That matters for anyone doing this math on a different address. The land-plus-tax-lag arbitrage that made the Sunset Drive bid rational only works if the zoning envelope on that specific lot supports the size of house the economics assume. Checking the current ordinance against a particular parcel, not just the neighborhood's reputation for teardowns, is now part of underwriting the deal.
What this means if you're weighing Millburn against other towns
For a buyer comparing Millburn and Short Hills price tags against other commuter suburbs, the "starter home" listings in this market aren't really starter homes. A dated two- or three-bedroom colonial priced in the high $800s or low $900s isn't competing against other move-in-ready houses at that price point. It's competing against its own land value, a construction budget, and a multi-year tax lag that a builder has already priced into the offer.
That also changes how to read the township's own averages. Millburn's average home value reached $1.3 million at the end of July 2026, up nearly 10 percent year over year. That figure blends genuinely move-in-ready homes with these land-plus-carrying-cost purchases, so it can understate what a comparable, already-finished square footage will actually cost a buyer who isn't planning to demolish anything, and overstate what the same square footage is worth as a fixer. A seller sitting on one of these older, well-located homes should recognize that part of the buyer pool is pricing the lot and the zoning envelope, not the condition of the kitchen, which changes both the right asking price and the right way to position the listing.
A few questions worth asking before you assume the math transfers
Does every Millburn teardown come with a lower tax bill for a few years? Not automatically, and not indefinitely. The 2017-baseline indexing applies to how the township treats a specific renovation or rebuild between revaluations, and the scope, timing, and paperwork on a given project all affect the outcome. Anyone underwriting this kind of purchase should confirm the specifics with the township tax assessor's office rather than assuming the Sunset Drive outcome applies as written.
Can I build as large as the Sunset Drive project on any lot? Only if the lot's size and the current zoning allow it. That project sat on a 0.26-acre parcel under the rules in place at the time. The June 2026 FAR and setback ordinances were adopted specifically to limit how much house a given lot can support, so the same square footage may not be available elsewhere in town today.
When is Millburn's next town-wide revaluation? The last one was completed in 2017. Essex County Tax Board discussions point to Millburn eventually joining the county's broader revaluation cycle, with 2029 commonly cited as the expected timing, though no firm date has been publicly finalized. Anyone planning around the current assessment gap should watch for county announcements rather than treat 2029 as fixed.
If you're trying to figure out what a specific Millburn or Short Hills property is really priced against, the sale comps, the zoning envelope, and the tax history all need to be read together, not separately. That's the kind of read the Stephanie Mallios Team does for buyers and sellers across this market every day. Schedule a personal market consultation and bring the address you're watching.
