Frontera Resources, an international oil and gas company. The six-bedroom Beaux Arts house in Kalorama was built in 1919 and features an impressive brick and limestone façade. The former residence of the ambassador of the Organization of the American States to the United States, it boasts spectacular entertaining spaces with grand rooms opening to a double lot with tiered gardens, terrace and heated pool.The listing agents were Washington Fine Properties’ Margot Wilson,William F.X. Moody and Robert Hryniewicki; the buyers’ agent was Richard Newton of Washington Fine Properties. Gary and Patricia Duncan bought  KLINGLESTREETNW for $2,070,000 from Willard Freeman. Mr. Freeman is CEO of Concordis Advisors, a Philadephia-based real estate advisory firm. The six-bedroom, fiveand-one-half-bathroom French Colonial in Kent was built in 1990. The property features a four-car garage, large sunny rooms and a wine cellar. The listing agent was Cynthia Howar of Washington Fine Properties while the buyers’ agent was Re/Max’s Ellen McRae. Joseph Duffey sold 	NEWMEXICO AVENUE NW  to the Trafford Trust for $1,150,000. Mr. Duffey is a well-known academic, political appointee and former head of the National Endowment for the Humanities and the U.S. Information Agency. His wife, the late Anne Wexler, was an influential lobbyist and public policy advisor. The one-bedroom condominium is in The Colonnade, a large complex built in 1966.