There are a couple of ways to get up here from downtown. You take the "C" train on the IND train line.

This is the local subway train that makes a stop at 155 Street and ST Nicholas Ave. Looking straight ahead you'll see the intersection of St Nicholas and 155 Street.

At this intersection is elementary school PS 28. When I would come home this way, I'd walk around the back side of the school where the basketball court resides.