I might not stop
Places to cop, seventy-six floors, you can call me the Doc

from Jay-Z – "Grammy Family" Freestyle Lyrics on Rap Genius

Meaning

As Jay explains in a spoken aside, his offices as President of Def Jam were on the 76th floor of the Universal Music Group building at 825 8th Ave, New York City. Julius “Dr. J” Erving was a high-flying basketball star who played for the Philadelphia 76ers during the 1970’s and 80’s

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