The Ramps were at BMX Pros Bike Shop which is now a Boat Dealership.
One theme of this video holds throughout: "I'll Demonstrate"
(1986) Freestyle Clinic Featuring: Dennis McCoy. This video was released in 1986. This was right as Dennis was starting to get big. My friend Jamie brought this tape up to my house (Knowing I was a DMC Fan) and suggested I watch. It was filmed in the Kansas City area where Dennis lived. Most of the Ground Demo's are done in what looks like a Mall Fountain area.