A Rocky Mountain-based hedge funder is unloading his gallery-like Manhattan pied-a-terre at 50 UN Plaza.

The condo is part of a bicoastal portfolio of luxury homes John Tozzi— president and CEO of Cambridge Investments Ltd., based in Jackson Hole, Wyoming—has listed over the past year or so, including a San Francisco-area megamansion that threatened to obliterate local price records when it hit the market last year for $85 million.

He's also reportedly owned a swath of land overlooking the Teton Range in Jackson Hole that spanned about two-thirds the size of Central Park.

By comparison, Mr. Tozzi’s apartment at 50 UN Plaza is considerably more modest: A three-bedroom, three-bathroom apartment on the 27th floor, for which he’s asking $6.45 million, according to Carol Staab of Douglas Elliman, who will list the home this week.

From its perch on the East Side, the condo boasts floor-to-ceiling windows that frame panoramas of Midtown’s iconic skyline, including the Chrysler and Empire State buildings, as well as the East River.

Eleven-foot ceilings and modern minimalism were an ideal template for Mr. Tozzi, an avid contemporary art collector. His collection begins right at the front door, where a six-foot oil painting by Wayne Thiebaud greets guests in the home’s airy foyer, according to images and information from the listing agency.

Many of New York City’s new developments over the past decade have forgone walls in favor of open floor plans, but this unit has distinct rooms, including a formal dining room and a large kitchen tucked away behind pocket doors.

The unit is dressed in white-oak floors and neutral furnishings that show off Mr. Tozzi’s array of works by Richard Diebenkorn, William de Kooning and Franz Kline. (The art is very much not for sale, however, Ms. Staab noted.)

The office doubles as a guest bedroom and includes a set of bunk-like Murphy beds custom built into one wall, images show. There are two walk-in closets in the main bedroom, plus a bathroom with heated marble floors and a soaking tub with its own dramatic nighttime views of the Chrysler Building, images of the home show.

“The layout is really very well suited for privacy and entertainment since the bedrooms are a far distance from the entertainment space,” Ms. Staab said, adding that the owner has added sound-proofing to the unit.

Mr. Tozzi bought the apartment straight from the developer in 2015, as work was finishing up on the sparkling glass tower designed by Foster + Partners. He paid nearly $6.7 million back then, property records show.

A slew of high-profile diplomatic and domestic residents live in the building, including a penthouse for the U.S. ambassador to the United Nations.

Other owners include the “Queen of New Zealand”—more commonly known as the U.K.’s Queen Elizabeth II—and the British secretary of state, as well as missions to the UN from Qatar and Kuwait, according to records accessed on PropertyShark.

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