Paul Mellon's former Observatory Circle mansion sells off market for $21.3M

May 14, 2026 - 17:42

A historic mansion in Washington D.C.'s Observatory Circle neighborhood has changed hands in a private off-market transaction for $21.255 million, making it the second-largest residential sale in the District so far this year. The property was formerly owned by the late philanthropist and art collector Paul Mellon, a prominent figure in the city's cultural and social circles.

The sale, which closed quietly without a public listing, underscores the continued strength of the luxury real estate market in the nation's capital. The mansion, known for its stately architecture and expansive grounds, sits in one of the most exclusive enclaves near the Naval Observatory. While the identity of the buyer has not been disclosed, sources familiar with the deal describe it as a cash transaction handled by a private family trust.

Paul Mellon, who died in 1999, was the son of banking magnate Andrew Mellon. He was a major benefactor of the National Gallery of Art and other cultural institutions. The property itself spans multiple levels and includes formal gardens, a carriage house, and views of the surrounding parkland. Real estate experts note that off-market deals of this magnitude are rare but increasingly common among high-net-worth buyers seeking discretion. The sale follows a trend of trophy properties in Washington changing hands without public exposure, reflecting a preference for privacy among the city's elite.