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WASHINGTON, D.C. — Marriott International last month opened its 4,000th hotel — the $520 million Marriott Marquis in Washington, D.C. The hotel, located adjacent to the Walter E. Washington Convention Center, is one of five Marriott Marquis hotels in the United States. International architecture firms Cooper Carry and tvsdesign collaborated on the hotel, which was designed to achieve LEED Silver certification. The 15-story, 1,175-room hotel is linked to the historic Samuel Gompers AFL-CIO headquarters, which features an upscale bar, fitness center and boutique guestrooms. The project team includes developers Quadrangle Development Corp. and Capstone Development.