A boutique brokerage representing private mountain and coastal properties across the American West. Eighty-two estates a year, never a hundred. The other ninety-nine percent of houses we politely decline.
i. · Red Mountain · representation 2024$ 8.4 mOur public catalogue. Another hundred-and-eighteen are held privately, available to registered buyers under a non-disclosure. If you do not see what you are looking for - you may be looking in the wrong half.
New - this weekREF · HE-24-014♡i. exterior · golden hourSix bedrooms, five baths, four-point-three acres. South-facing glass wall to the valley, James Turrell skyspace at the rear of the property, a wine cellar previously housing the Mondavi 1971 vertical.
Under offerREF · HE-24-007
Open SatREF · HE-24-011
New - this weekREF · HE-24-015
PrivateREF · HE-24-003
New - this weekREF · HE-24-018
Coming soonREF · HE-24-022Halden Estates was founded by Margaux Halden in Aspen, in 2003, with one principle: a brokerage that turns down more business than it accepts. Twenty-three years and 1.4 billion dollars later, we still keep the list at eighty-two.
We represent buyers and sellers of consequential homes - the kind that change a family’s shape, or end up in a magazine, or both. We do not list condos. We do not list timeshares. We do not, under any circumstance, hold an open house on Sunday.
- Margaux Halden, principal
We are old-fashioned about this. One agent, one client, start to finish. No teams, no transfers, no ‘showing partners’ you have not met. We bill flat fees on the buy side - we are agnostic about which house you choose, so long as it is the right one.
Independent counsel for the buyer of a meaningful house. Flat fee, billed in three stages: discovery, offer, close. We work an average of nine months per client - some have taken three years.
The opposite chair, with the same discipline. We sit with sellers for ninety days before listing - staging, photography, pricing, quietly testing the market through our private register first.
For owners of multiple homes who are tired of running them. Caretakers, groundskeepers, security, deliveries, snow, the cellar inventory, the tennis court, the helipad permits. Monthly retainer.
Acreage with a future on it. We source raw mountain land for clients building their own house, then introduce the architect, the contractor, and the patience. Five projects open at any time.
| Year | House · place | Type | Bd / Ba | Sqft | DOM | Sold | % list |
|---|---|---|---|---|---|---|---|
| 2025 | Westhaven · Red Mountain, Aspen | Mountain estate | 6 / 5.5 | 7,840 | 38 | $ 12.4 m | 97% |
| 2025 | Further Lane II · East Hampton | Coastal | 7 / 6.5 | 8,200 | 14 | $ 21.6 m | 98% |
| 2025 | The Wapiti · Jackson Hole | Mountain estate | 5 / 5.5 | 6,100 | 61 | $ 13.8 m | 96% |
| 2024 | Eight Mile · Old Snowmass | Working ranch | 6 / 4.5 | 5,800 | 83 | $ 8.9 m | 95% |
| 2024 | Calderwood · Castle Creek | Riverfront | 5 / 4 | 4,640 | 22 | $ 6.3 m | 99% |
| 2024 | Cottonwood House · Telluride | Ski-in chalet | 4 / 3.5 | 3,120 | 56 | $ 4.7 m | 97% |
| 2024 | Tesuque Adobe · Santa Fe | Mountain estate | 4 / 3 | 3,400 | 40 | $ 3.7 m | 98% |
One agent, one client, the whole way through. Each principal averages nineteen years in private real estate; six have architecture degrees; three speak Mandarin; one keeps bees.
i. · Margaux HaldenFounded the firm in 2003 after eight years at Sotheby’s and a short, unhappy stint as an architect. Born in Aspen, raised in Geneva. Closes the year’s largest deal more often than not.
ii. · Hollis ParkCoastal specialist. Knows every dune house from Wainscott to Montauk by its first owner. Architecture degree from Cooper Union.
iii. · Anders VossSourced more of Telluride’s top-twenty closings since 2015 than anyone in the valley. Skis at the level he negotiates.
iv. · Wren CalderaWyoming ranch specialist. Will tell you, candidly, that you do not want the property you came in to look at. Then sell you the right one.
v. · Lior MendelAdobe and contemporary New Mexico. Reads land surveys for pleasure; has the patience of an archaeologist.
vi. · Iona BeckInternational buyers, European and Asian. Mandarin, French, Italian. Once placed a 14-million-dollar house over a WeChat call.
i. autumn at red mountainIn 2014 there were 124 of them on the market. In Q4 of 2025 there are three. We trace what happened to the missing one-hundred-and-twenty-one - and what it means for the next buyer in line.
ii. further lane, februaryHollis on the technicalities of coastal zoning, FEMA flood maps, and why the seven properties between Sagaponack and East Hampton are not interchangeable, no matter what the listing photos suggest.
iii. telluride, blue hourAnders Voss on why the most-photographed properties in a mountain town are almost never the ones his clients end up in - and the four questions to ask a view before you commit.
We accept twenty-four sell mandates a year. The intake process takes about ninety days - we will visit twice, hire the photographer ourselves, propose a marketing plan in writing, and quietly test the number with our private register before anything goes public.
Twenty-two estates currently under our care, across four states. A small team of caretakers, groundskeepers, and one excellent house-manager who used to run the Aman in Bhutan. Monthly retainer; nothing surprises you on the bill.
We are not a walk-in business. The doors are usually locked. Should you be a client - or contemplating becoming one - ring ahead and we’ll put the kettle on.