Housing in Georgetown is expensive: Current rates start at $175,000 for a studio apartment in Foxhall and reach $20 million for a mansion on Prospect Street. But that doesn’t necessarily mean it is ...

HOUSE OF THE WEEK | Henry and Nancy Kissinger, who lived in the home while he was secretary of state, were among the noteworthy residents of the 1819 Federal-style house.

The penthouse is one of four at the 28-unit Ritz-Carlton Residences in Georgetown. It and the one-bedroom, two-bathroom unit on the first floor are listed together for $18 million.