Old Post Office Building, Washington, D.C.

E191104

federal building historic building landmark office building

The Old Post Office Building in Washington, D.C. is a historic late-19th-century federal building on Pennsylvania Avenue that has served various government and commercial uses and is noted for its prominent clock tower.

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All labels observed (5)

Label	Occurrences
Old Post Office building	2
Old Post Office	1
Old Post Office Building (Washington, D.C.)	1
Old Post Office Building, Washington, D.C. canonical	1
United States Post Office headquarters	1

How this entity was disambiguated

This entity first appeared as the object of triple T1334339 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Old Post Office Building, Washington, D.C.
Context triple: [Advisory Council on Historic Preservation, locatedIn, Old Post Office Building, Washington, D.C.]

A. J. Edgar Hoover Building
The J. Edgar Hoover Building is a large Brutalist-style office complex in Washington, D.C., that serves as the main headquarters of the FBI.
B. Smithsonian Institution Building
The Smithsonian Institution Building, often called "The Castle," is a distinctive red sandstone landmark on the National Mall that serves as the historic headquarters and visitor center of the Smithsonian Institution.
C. GAO Building
The GAO Building is the main Washington, D.C. office complex that serves as the central workplace for the U.S. Government Accountability Office’s oversight and auditing operations.
D. Old Capitol Building
The Old Capitol Building is a historic government structure in Tallahassee that once served as Florida’s state capitol and now functions as a museum.
E. Patent Office Building (Washington, D.C.)
The Patent Office Building in Washington, D.C. is a prominent 19th-century Greek Revival landmark that has housed various federal institutions and now contains the Smithsonian American Art Museum and the National Portrait Gallery.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Old Post Office Building, Washington, D.C.
Target entity description: The Old Post Office Building in Washington, D.C. is a historic late-19th-century federal building on Pennsylvania Avenue that has served various government and commercial uses and is noted for its prominent clock tower.

A. J. Edgar Hoover Building
The J. Edgar Hoover Building is a large Brutalist-style office complex in Washington, D.C., that serves as the main headquarters of the FBI.
B. Smithsonian Institution Building
The Smithsonian Institution Building, often called "The Castle," is a distinctive red sandstone landmark on the National Mall that serves as the historic headquarters and visitor center of the Smithsonian Institution.
C. GAO Building
The GAO Building is the main Washington, D.C. office complex that serves as the central workplace for the U.S. Government Accountability Office’s oversight and auditing operations.
D. Old Capitol Building
The Old Capitol Building is a historic government structure in Tallahassee that once served as Florida’s state capitol and now functions as a museum.
E. Patent Office Building (Washington, D.C.)
The Patent Office Building in Washington, D.C. is a prominent 19th-century Greek Revival landmark that has housed various federal institutions and now contains the Smithsonian American Art Museum and the National Portrait Gallery.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	federal building ⓘ historic building ⓘ landmark ⓘ office building ⓘ
addedToNationalRegisterOfHistoricPlaces	March 24, 1973 ⓘ
alsoKnownAs	Old Post Office Pavilion ⓘ Old Post Office and Clock Tower ⓘ linked to: Old Post Office Tower
architect	Office of the Supervising Architect of the U.S. Treasury ⓘ Willoughby J. Edbrooke ⓘ
architecturalStyle	Richardsonian Romanesque ⓘ Romanesque Revival ⓘ linked to: Neo-Romanesque
completionDate	1899 ⓘ
constructionStartDate	1892 ⓘ
country	United States ⓘ linked to: United States of America
hasPart	Old Post Office Tower ⓘ clock tower ⓘ
height	315 feet ⓘ 96 meters ⓘ
historicSignificance	early steel-frame high-rise in Washington, D.C. ⓘ one of the few remaining late-19th-century federal buildings in Washington, D.C. ⓘ
locatedBetween	U.S. Capitol and White House on Pennsylvania Avenue ⓘ
locatedIn	Downtown Washington, D.C. ⓘ Federal Triangle ⓘ Washington, D.C. ⓘ
locatedNear	Internal Revenue Service Building ⓘ U.S. Department of Commerce Building ⓘ linked to: Herbert C. Hoover Building
locatedOn	Pennsylvania Avenue NW ⓘ
managedBy	U.S. General Services Administration ⓘ
material	granite ⓘ sandstone ⓘ
numberOfFloors	12 ⓘ
opened	1899 ⓘ
originalFunction	United States Post Office headquarters ⓘ linked to: Old Post Office Building, Washington, D.C. main post office for Washington, D.C. ⓘ
ownedBy	General Services Administration ⓘ linked to: U.S. General Services Administration
owner	U.S. federal government ⓘ linked to: United States government
partOf	Federal Triangle complex ⓘ linked to: Federal Triangle Pennsylvania Avenue National Historic Site ⓘ
preservationCampaign	1970s preservation efforts saved building from demolition ⓘ
referenceNumber	73002124 ⓘ
renovation	1980s renovation for mixed-use development ⓘ
threatenedWithDemolition	1920s ⓘ 1970s ⓘ
towerManagedBy	National Park Service ⓘ
towerObservationDeck	public observation deck ⓘ
towerViews	panoramic views of Washington, D.C. ⓘ
use	federal offices ⓘ hotel ⓘ retail space ⓘ