| Marriott Marquis Washington, DC | |
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 Washington Marriott Marquis in 2023 | |
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| Hotel chain | Marriott Hotels & Resorts |
| General information | |
| Location | United States |
| Address | 901 Massachusetts Avenue NW, Washington, D.C. |
| Coordinates | 38°54′13″N 77°01′29″W / 38.903574°N 77.024654°W |
| Opened | May 1, 2014 |
| Cost | $520 million |
| Owner | Capstone Development District of Columbia ING Group Marriott International Quadrangle Development Corporation |
| Management | Marriott International |
| Technical details | |
| Floor count | 18 (14 above ground, 4 below ground) |
| Design and construction | |
| Architect(s) | Cooper Carry and tvsdesign; BBGM (interior) |
| Other information | |
| Number of rooms | 1,175 rooms |
| Number of suites | 49 suites |
| Parking | 400 spaces |
| Website | |
| www | |
Marriott Marquis Washington, DC is a luxury hotel located on Massachusetts Avenue NW, in NW, Washington, D.C., United States. The hotel is connected to the Walter E. Washington Convention Center across 9th Street NW via an underground concourse and receives significant business from convention attendees.
The hotel has 100,000 square feet (9,300 m2) of meeting room space, which includes a 30,000-square-foot (2,800 m2) main ballroom and two smaller 10,800-square-foot (1,000 m2) ballrooms. The building is topped by a 18,800-square-foot (1,750 m2) glass-encased penthouse, and a 5,200-square-foot (480 m2) outdoor event terrace.
The hotel is owned by Capstone Development, the District of Columbia, ING Group, Marriott International, and Quadrangle Development Corporation. The operator is Marriott International. It opened on May 1, 2014, and has 1,175 rooms (which includes 49 suites), a lobby with multi-story atrium, and four dining outlets on the first floor. The hotel has 14 stories above ground, and four stories below.