Old Post Office Building, Washington, D.C.
E191104
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.
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 Tower ⓘ
surface form:
Old Post Office and Clock Tower
|
| architect |
Office of the Supervising Architect of the U.S. Treasury
ⓘ
Willoughby J. Edbrooke ⓘ |
| architecturalStyle |
Richardsonian Romanesque
ⓘ
Neo-Romanesque ⓘ
surface form:
Romanesque Revival
|
| completionDate | 1899 ⓘ |
| constructionStartDate | 1892 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| 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
ⓘ
Herbert C. Hoover Building ⓘ
surface form:
U.S. Department of Commerce Building
|
| locatedOn | Pennsylvania Avenue NW ⓘ |
| managedBy | U.S. General Services Administration ⓘ |
| material |
granite
ⓘ
sandstone ⓘ |
| numberOfFloors | 12 ⓘ |
| opened | 1899 ⓘ |
| originalFunction |
Old Post Office Building, Washington, D.C.
self-linksurface differs
ⓘ
surface form:
United States Post Office headquarters
main post office for Washington, D.C. ⓘ |
| ownedBy |
U.S. General Services Administration
ⓘ
surface form:
General Services Administration
|
| owner |
United States government
ⓘ
surface form:
U.S. federal government
|
| partOf |
Federal Triangle
ⓘ
surface form:
Federal Triangle complex
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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Old Post Office Building, Washington, D.C. Description of subject: 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.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
Advisory Council on Historic Preservation
→
locatedIn
→
Old Post Office Building, Washington, D.C.
ⓘ
Trump International Hotel Washington, D.C. (former Old Post Office)
→
occupies
→
Old Post Office Building, Washington, D.C.
ⓘ
subject surface form:
Trump International Hotel Washington, D.C.
this entity surface form:
Old Post Office
Old Post Office Building, Washington, D.C.
→
originalFunction
→
Old Post Office Building, Washington, D.C.
self-linksurface differs
ⓘ
this entity surface form:
United States Post Office headquarters
subject surface form:
Waldorf Astoria Washington DC
this entity surface form:
Old Post Office building
subject surface form:
Waldorf Astoria Washington DC
this entity surface form:
Old Post Office building
this entity surface form:
Old Post Office Building (Washington, D.C.)