24/7 Wall St.

The most expensive home for sale in Connecticut, or just about anywhere in the United States, is an island mansion just off waspish Darien, along the Long Island coast of the state as it runs toward the Rhode Island border. About 50 miles from New York City, Great Island Road does not even have a street address.

The house has 10 bedrooms, eight full baths and two half-baths inside a total of 13,170 square feet. The $175 million price tag probably has much more to do with the land on which the house sits. It is over 62 acres. As a reference, Central Park covers 843 acres.

There are other buildings and facilities on the island, but not nearly enough to take up most of the property’s size. In other words, the buyer gets a lot of privacy and land that is not currently used.

Darien is one of a string of very wealthy cities that stretch from Greenwich to Southport. Each is within commuting distance of New York City, or, at a shorter distance, the hedge funds and financial firms that keep headquarters in the same cities. Darien had a population of 21,689 in 2014. The median household income was above $160,000, or more than three times the national average. Over 95% of the residents were white.

The listing:

Extraordinary 63 acre waterfront island estate with seemingly endless east, south, and west views of Long Island Sound to the Long Island shore adjoining 14 acres of conservation property with a wide land bridge to the gated mainland driveway leading to Long Neck Point in Darien. Incredible beauty and solitude; views of lighthouse as well as secluded anchorage in hidden cove. Romantic Italian stone manor house, plus substantial stable and equestrian facilities including a polo field and an indoor ring plus additional dwellings; beach house, and boathouse.

By the way, with a 20% down payment, Realtor.com estimates monthly payments for principal and interest, taxes and insurance, are only $958,328.