Used to not be allowed in the buildin'

from Wiz Khalifa (Ft. Curren$y) – Rooftops Lyrics on Rap Genius

Meaning

He’s talking about how he went from the bottom (no one really knowing his name) to the top (being famous and having a lot of money).
Rooftop — – he’s ON TOP
Not even allowed in the building — – he’s NOBODY

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