The 35-meter setback from Sixth Avenue accommodates a sunken plaza dominated by the 15-meter abstract steel sculpture Sun Triangle by Athelstan Spilhaus.
The 205 meters tall building has its piers clad in red granite. Around the west side of the tower is a seven-storey base, behind which runs the landscaped through-block public passageway, necessitated by the city authorities for all the Extension buildings.
The lobby is clad in dark red terrazzo and red marble and decorated with aphorisms from Plato and John F. Kennedy.
On the western portion of the building site is the McGraw-Hill's contribution to the through-block Extension promenades, most notable by its waterfall wall, with a transparent plexiglass tunnel leading through.
The McGraw-Hill publishing company had studied the possibility of expanding to a planned new office building above the Port Authority Bus Terminal expansion on 42nd Street -- next to the company's existing building McGraw-Hill Building. Because of the then-questionable status of 42nd Street the plan was dropped and the company occupied two-thirds of its namesake building in Rockefeller Center instead.
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