The crown-jewel penthouse at the St. Regis Residences in the Seaport is everything a trophy listing is supposed to be: two levels, roughly 10,600 square feet, a double-height great room, a sculptural floating staircase, and an indoor pool with a retractable roof. It is also still on the market more than 300 days after it first appeared for sale. Listed at $44.5 million, it is the priciest home currently on the market in Massachusetts, and it shows how selling a so-called “unicorn” property often means chasing buyers across oceans, not just down the street.
"You have to be like a CIA agent. It's like a reporter's job," George Sarkis of The Sarkis Team at Douglas Elliman told The Boston Globe, describing the level of digging and targeted outreach brokers use to find the tiny circle of people who could even consider such a purchase. In Boston's tight luxury market, brokers say they spend months building networks, nurturing relationships with yacht and jet brokers, and phoning prospective buyers directly, one by one.
The listing and the numbers
The unit is listed in MLS as Unit GPH at 150 Seaport Boulevard and, according to MLS data reported on Redfin, shows a price cut to $44.5 million on Jan. 28, 2026 after first appearing in June 2025. Redfin records the penthouse at about 10,609 square feet with six bedrooms and nine bathrooms, and notes a market estimate substantially below the asking price, a reminder of how thin the buyer pool can be at this level.
How brokers hunt for buyers
Brokers marketing the Seaport penthouse told The Boston Globe they target out-of-town agents and buyers in markets from Manhattan to Palm Beach and Los Angeles, attend boat shows, and cultivate yacht and aviation contacts to tap wealth outside Greater Boston. That old-school, phone-call-heavy outreach sits alongside newer tools, as agents also use specialty websites and paid databases to track potential buyers' property holdings and travel habits.
Market reality for ultraluxury
Even with that high-touch marketing, the math is blunt. Redfin's estimate on the listing places market value in the high $30 millions, well under the list price, underscoring a gap that can force months or years of patient courting or a steep price adjustment. In other ultraluxury cases brokers described to reporters, sellers relisted, trimmed their price, or found buyers from outside the usual Boston crowd, a reminder that the so-called unicorn sale is as much about timing and networks as it is about furnishings and views.
For the St. Regis penthouse the available moves are simple but not easy: keep up the cross-market outreach, accept a long runway, or take another round of cuts. Whoever eventually buys it will likely arrive by private jet or via a broker's carefully guarded Rolodex, which is exactly the challenge that has turned selling the city's priciest condo into a specialist’s puzzle.
