Photograph by Stephen Gosling.
Assessed value: $4.3 million
Market value: $10 million to $15 million
Spain’s ambassador lives in a 20,000-square-foot house on DC’s Foxhall Road. Designed by Spanish architect José Rafael Moneo, it was built into a hill and sits behind an imposing brick wall. Across the street is another walled mansion: the former home of David Kreeger (now the Kreeger Museum), designed by Philip Johnson.