Excellent idea for a thread!
New York City has quite a few of these:
BEST
2 Broadway | Completed in 1958 and remodeled in 1999.
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Salesforce Tower | Completed in 1974 as the headquarters for New York Telephone, remodeled in 2007.
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Trump International Hotel & Tower | Completed in 1970 as the Gulf + Western Building, remodeled in 1997 into a luxury hotel and condominiums.
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WORST
52 Broadway | Completed in 1898 and sadly remodeled in 1982 with 8 additional floors.
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375 Pearl Street | Completed in 1975 as a telephone switching building for New York Telephone. Partially remodeled into an office building in 2016, there are currently no plans to reclad the rest of the building...
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1 Times Square | Completed in 1904 as the headquarters for the New York Times, remodeled in 1963 into the Allied Chemical Tower.
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Since 1995 it has covered with billboards as the owners felt the building would be more profitable as a giant billboard due to the tiny floor plates.
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335 Madison Avenue | Completed in 1913 as the Biltmore Hotel and remodeled into an office building in 1981.
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3 Columbus Circle | Completed in 1928 as the Columbus Tower, remodeled in 2005 into 3 Columbus Circle.
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2 Columbus Circle | Completed in 1964 and remodeled in 2005.
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Grand Hyatt New York | Completed in 1919 as The Commodore Hotel, remodeled in 1980 by Donald Trump. The building has been proposed for demolition earlier this year.
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