Where: 1020 Pennsylvania Avenue, SE
Design: Sassan Gharai, founder of SGA Architects, designed the six-story, red-brick Victorian mansion to blend in with surrounding historic rowhouses.
Number of units: 28, including studios—which have already sold out—and one- and two-bedroom units.
Price: One-bedrooms start at $339,000, two-bedrooms at $500,000
Location, location, location: Butterfield House is within walking distance of the US Capitol, the Supreme Court, Eastern Market, and the new Nationals stadium.
On the market: While most units have sold, six are still on the market.
Interesting perk: Residents pay $25 for a ZipCar membership—about 50 percent off the annual fee.
Green factor: The cherry floors are reused from an older building, low-flush toilets save water, and appliances have an Energy Star rating.
Metro: It’s a three-block walk to Eastern Market, on the Metro’s Blue and Orange lines.