Fannie Mae closed on the sale of three of its buildings in Washington, DC, last week, including the iconic headquarters. The 1958 Williamsburg-style building sold for $89 million. Roadside Development, a private commercial real estate firm, along with the North American unit of Sekisui House, a large Japanese homebuilder, bought the 228,000-square-foot property situated on 10-acres of land. Roadside is known for its adaptive reuse of commercial properties. While speculation points to the possibility of the developer building condominiums and retail space on the site at 3900 Wisconsin Ave., said a spokeswoman for the developer. “Roadside Development plans to collaborate with the community on the parcel’s vision...