Old Post Office Tower
E716691
The Old Post Office Tower is a historic clock and bell tower in Washington, D.C., known for its panoramic views of the city and its prominent location on Pennsylvania Avenue.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Old Post Office Tower canonical | 2 |
| Old Post Office and Clock Tower | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8182698 — 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 Tower Context triple: [Old Post Office Building, Washington, D.C., hasPart, Old Post Office Tower]
-
A.
Post Office Tower
The Post Office Tower, now known as the BT Tower, is a prominent telecommunications tower and London landmark that was once the tallest building in the city.
-
B.
The Exchange Tower
The Exchange Tower is a prominent commercial skyscraper in Dubai’s Business Bay district, known for its modern office spaces and views of the city’s skyline.
-
C.
Exchange Tower
Exchange Tower is a prominent office skyscraper in Toronto’s financial district that serves as the headquarters of the Toronto Stock Exchange.
-
D.
Pierhead Building
The Pierhead Building is a historic red-brick landmark in Cardiff Bay, Wales, originally built as the headquarters of the Bute Dock Company and now used as a visitor and exhibition centre for the Senedd.
-
E.
St Thomas’s Tower
St Thomas’s Tower is a historic riverside tower within the Tower of London complex, best known for housing the medieval royal watergate often called Traitors’ Gate.
- 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 Tower Target entity description: The Old Post Office Tower is a historic clock and bell tower in Washington, D.C., known for its panoramic views of the city and its prominent location on Pennsylvania Avenue.
-
A.
Post Office Tower
The Post Office Tower, now known as the BT Tower, is a prominent telecommunications tower and London landmark that was once the tallest building in the city.
-
B.
The Exchange Tower
The Exchange Tower is a prominent commercial skyscraper in Dubai’s Business Bay district, known for its modern office spaces and views of the city’s skyline.
-
C.
Exchange Tower
Exchange Tower is a prominent office skyscraper in Toronto’s financial district that serves as the headquarters of the Toronto Stock Exchange.
-
D.
Pierhead Building
The Pierhead Building is a historic red-brick landmark in Cardiff Bay, Wales, originally built as the headquarters of the Bute Dock Company and now used as a visitor and exhibition centre for the Senedd.
-
E.
St Thomas’s Tower
St Thomas’s Tower is a historic riverside tower within the Tower of London complex, best known for housing the medieval royal watergate often called Traitors’ Gate.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
bell tower
ⓘ
clock tower ⓘ historic building ⓘ |
| accessType | free public admission (subject to security screening) ⓘ |
| architecturalStyle |
Romanesque Revival
ⓘ
linked to:
Neo-Romanesque
|
| associatedWith |
Old Post Office Pavilion redevelopment
ⓘ
Trump International Hotel Washington, D.C. (in the surrounding building) ⓘ |
| builtFor |
United States Post Office Department
ⓘ
linked to:
Post Office Department
|
| city | Washington, D.C. ⓘ |
| completionDate | 1899 ⓘ |
| constructionStartDate | 1892 ⓘ |
| country | United States of America ⓘ |
| elevationRelativeToCity | one of the highest public viewpoints in Washington, D.C. ⓘ |
| floorCount | 12 ⓘ |
| hasElevator | yes ⓘ |
| hasFeature |
bells
ⓘ
clock ⓘ observation deck ⓘ panoramic city views ⓘ |
| hasStairs | yes ⓘ |
| hasViewOf |
National Mall
ⓘ
Pennsylvania Avenue ⓘ Potomac River ⓘ U.S. Capitol ⓘ
linked to:
United States Capitol
Washington Monument ⓘ |
| height |
315 feet
ⓘ
approximately 96 meters ⓘ |
| heritageDesignation |
National Register of Historic Places listing
ⓘ
linked to:
National Register of Historic Places
|
| heritageDesignationDate | 1973 ⓘ |
| inception | 1899 ⓘ |
| locatedIn | Downtown Washington, D.C. ⓘ |
| locatedOn | Pennsylvania Avenue NW ⓘ |
| location | Washington, D.C. ⓘ |
| managedBy | National Park Service ⓘ |
| near |
National Mall
ⓘ
United States Capitol ⓘ White House ⓘ |
| NRHPType | contributing property ⓘ |
| opened | 1899 ⓘ |
| operator | National Park Service ⓘ |
| ownedBy |
United States federal government
ⓘ
linked to:
United States government
|
| partOf |
Federal Triangle
ⓘ
Old Post Office Pavilion ⓘ Pennsylvania Avenue National Historic Site ⓘ |
| publicAccess | open to the public as an observation deck ⓘ |
| ranking | third-tallest building in Washington, D.C. ⓘ |
| significance |
example of late 19th-century federal architecture in Washington, D.C.
ⓘ
landmark of Pennsylvania Avenue ⓘ |
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 Tower Description of subject: The Old Post Office Tower is a historic clock and bell tower in Washington, D.C., known for its panoramic views of the city and its prominent location on Pennsylvania Avenue.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Old Post Office Tower