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William Haseltine's beautiful backyard. (Sotheby's)

The District may seem like it has high-end real estate, but it’s not actually very often that prices top ten million bucks. So last week’s listing of 3503 P Street NW, at $13.25 million, is worth a mention. As far as I can tell, the mega-buys still out there are:

All in Georgetown, surprise surprise. The neighborhood still holds D.C.’s record for most expensive house sold—media mogul Richard Allbritton‘s $24 million purchase of the Bowie-Sevier House from developer Herb Miller in 2007.

Anyway, the latest gilded listing comes courtesy of William Haseltine, who has founded no fewer than eight biotech companies (including Rockville-based Human Genome Sciences) holds 50 patents, and in 2007 started the American Freedom Campaign with Naomi Wolf and MoveOn.org co-founder Wes Boyd. Haseltine won’t be going homeless, though. He still owns a spot on the 86th floor of the Trump World Tower in New York, which he bought for $9,877,025 in early 2008.

Sotheby’s doesn’t make note of a couple special selling points—it took Curbed to discover that Haseltine’s mansion hosted Mama and Papa Kennedy during their son’s 1961 inauguration, and played a bit part in Brat Pack classic St. Elmo’s Fire.

UPDATE, 9:00 p.m. Sunday: Make that fifth-most expensive house. Just after this post published, 1824 R Street NW popped up on Redfin for a cool $14.95 million. Choices, choices!