Former defense secretary Donald Rumsfeld’s Kalorama home is under contract after just 10 days on the  market.  There’s no word yet on which Washington big spender snapped up the prime real estate listed for a cool $4.5 million on July 8.

The neighborhood — described by realtors as Washington’s “Mayfair” —  is most popular with diplomats, cabinet members and the like, said real estate agent Virgina Chew of Washington Fine Properties, who is handling the sale.

Chew declined to give us the buyer’s name because the transaction hasn’t been finalized. But it’s safe to say he or she was willing to plunk down close to the sticker price.

“You wouldn’t take a huge drop in price when something is new on the market. It’s got to be a fairly good price,” said Chew, adding quickly, “but that’s just speculation.” Kalorama homes typically go for $2 to $10 million, depending on their size. Rummy’s former 5,000-square-foot abode, with its seven bedrooms, 6.5 bathrooms, pool and a mini greenhouse, falls pretty squarely in the middle of the market in terms of price.

“It’s certainly not in the highest range by a long shot,”  Chew said.

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