Quadrangle Development Corporation is a Washington, D.C.-based, vertically-integrated development firm. The company is one of Washington, D.C. s largest full-service commercial real estate developers. Quadrangle s varied projects include high-tech urban and suburban office settings, world-class hotels and resorts, multi-family residences and mixed-use retail, office and living environments. The company s focus is on the development, ownership and operation of investment-grade commercial and residential properties in Virginia, Maryland and Washington, D.C. Founded in 1971, Quadrangle has established various subsidiary entities that hold the company s real estate operations and investments and provide asset management, leasing, property management, personnel and parking management for properties the company owns for its own account or operates for others.