Department Of City Planning

The impetus behind the rezoning plan allowing taller towers in the blocks surrounding Grand Central Terminal - specifically the five blocks of Vanderbilt Avenue from East 42nd Street to East 47th Street - is to keep New York competitive with office development in other major cities like London and Shanghai. However, according to the Wall Street Journal, the hotel-workers union, which had a key role in the demise of a similar proposal under former Mayor Michael Bloomberg, has flexed its muscles once again, seeking a concession that would require any new hotels to receive a special permit from the City Planning Commission and the City Council.
More details on the rezoning here