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What are the rules for building names? In particular, does the word "building" need to be capitalized when a part of a building's name? How about article "the" - what are the rules for using it as a part of the name, and does it get capitalized in the middle of the sentence? For instance: is it "the American Radiator building" or "The American Radiator Building" or "American Radiator building"? How about when the address is the name of the building, like 7 World Trade Center?

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Building names are proper nouns. The given (or official) name of the structure you mentioned is "American Radiator Building"*. Thus, "Building" should always be capitalized in this name. On the other hand, the is not part of the given name. So, in this sentence:

I visited the American Radiator Building yesterday

it would be incorrect to capitalize the thus:

I visited The American Radiator Building yesterday

When writing an address, the official name of the building should always be used. It follows that all the words in that name should be capitalized. Your example,

 7 World Trade Center

is correct. One might also see/hear "World Trade Center" used within a sentence, for instance:

Memories of the tragedy at the World Trade Center remain fresh in our hearts.

It would be wrong to capitalize the in the above example, based on the aforementioned reason.

*Interesting note: Though still widely referred to by its old name, "American Radiator Building" was officially renamed "American Standard Building".

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@RegDwight: Ah, right you are! My bad. Edited to fix that. Thanks for pointing out. – Jimi Oke Dec 18 '10 at 18:19

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