The sample for this song is Built This City by Starship.
As Just Blaze tells it:
“One day I was at Baseline and Jim walked in and he goes, ‘Yo Jus, I got this idea. I got this sample.’ he’s going on and on. There’s this whole big build up and then he finally plays the record and I’m like, ‘I did it already. I did it about three years ago.’