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The clock tower of Philadelphia City Hall was part of the tallest building in the world from 1894 , when the tower was topped out and the building partially occupied , until 1908 .
 Philadelphia City Hall
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Philadelphia City Hall