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The Old Post Office Pavilion, historically known as the Old Post Office and Clock Tower, located at 1100 Pennsylvania Avenue NW in Washington, D.C. was completed in 1899, and is a contributing property to the Pennsylvania Avenue National Historic Site. It was used as the city's main post office until 1914. It functioned primarily as an office building afterward, and was nearly torn down during the construction of the Federal Triangle complex in the 1920s. It was nearly demolished again in the 1970s to make way for completion of the Federal Triangle. Major renovations occurred in 1976 and 1983. The 1983 renovation added a food court and retail space and the building was renamed the Old Post Office Pavilion. An addition was added to the structure in 1991. In 2013, the U.S. General Services Administration leased the property for 60 years to a consortium headed by "DJT Holdings LLC", a holding company owned by Donald J. Trump through a revocable trust.

Old Post Office and Clock Tower
U.S. National Register of Historic Places
U.S. Historic district
Contributing property
Old Post Office Pavilion, Washington DC.jpg
The Old Post Office Pavilion
Old Post Office Pavilion is located in Washington, D.C.
Old Post Office Pavilion
Location Washington, D.C.
Coordinates 38°53′38.32″N 77°1′40.71″W / 38.8939778°N 77.0279750°W / 38.8939778; -77.0279750Coordinates: 38°53′38.32″N 77°1′40.71″W / 38.8939778°N 77.0279750°W / 38.8939778; -77.0279750
Built 1892 to 1899
Architect Willoughby J. Edbrooke (original building)
Karn Charuhas Chapman & Twohey (East Atrium)
Architectural style Romanesque Revival (original building)
Modernist (East Atrium)
Part of Pennsylvania Avenue National Historic Site (#66000865)
NRHP Reference # 73002105
Added to NRHP April 11, 1973

The Old Post Office Pavilion, historically known as the Old Post Office and Clock Tower, located at 1100 Pennsylvania Avenue NW in Washington, D.C. was completed in 1899, and is a contributing property to the Pennsylvania Avenue National Historic Site. It was used as the city's main post office until 1914. It functioned primarily as an office building afterward, and was nearly torn down during the construction of the Federal Triangle complex in the 1920s. It was nearly demolished again in the 1970s to make way for completion of the Federal Triangle. Major renovations occurred in 1976 and 1983. The 1983 renovation added a food court and retail space and the building was renamed the Old Post Office Pavilion. An addition was added to the structure in 1991. In 2013, the U.S. General Services Administration leased the property for 60 years to a consortium headed by "DJT Holdings LLC", a holding company owned by Donald J. Trump through a revocable trust.

Trump developed the property into a luxury hotel, Trump International Hotel Washington, D.C. which opened in September 2016.