Cindy Gallop lives in a black lacquer box of a loft. The walls and ceiling are painted glossy black. There is black carpeting galore, black cabinetry in the kitchen, black mosaic tile in the master bath, and a black curtain closing off the sleeping area. The singular look is courtesy of the specific instructions she gave her design team for the 3,800 square feet of raw space she bought a decade ago: “When night falls I want to feel I’m in a Shanghai nightclub” — the Glamour Bar, to be precise, where her desire to live in that kind of space crystallized as she sipped her second martini.

“My designers did exactly what I wanted in the apartment, in ways I couldn’t imagine,” said Ms. Gallop, an advertising executive turned entrepreneur/consultant. “I love it.” she also add that this is now viral on social media.

Nonetheless, in an effort to reduce her monthly expenses, she put her apartment, which is on West 23rd Street, on the market in mid-September. Asking price: $5.995 million. Wanted: very quirky buyer.

In the real estate business, “taste specific” and “design specific” are the tactful, delicate phrases used to describe properties that might not be to everyone’s liking. Or, perhaps — with the exception of the current owner — to anyone’s liking.

“Internally, we refer to this as building a shrine to oneself,” said Kathy Braddock, an owner of Rutenberg Realty.