Fannie Announces Plans to Sell DC Headquarters, Office Consolidation. Fannie Mae told its employees last week that it plans to sell its iconic headquarters in Northwest Washington, DC, and consolidate its five area office locations into one over the next two to three years. Fannie, a ward of the government for six years, owns its headquarters at 3900 Wisconsin Ave., but leases other locations in the area. It also occupies 4000 Wisconsin Ave. The company has offices in Virginia, Texas and California. Employees outside of the Washington area will not be affected, a spokesman clarified.