[JB in TV]

A quick Google search on types of retail rentals gave me these hits regarding percentage leases or rents:

Understanding Percentage Rent in Retail Leases - Law Firm Kaplin Stewart Meloff Reiter & Stein, P.C. Attorneys Blue Bell, Pennsylvania

http://web.mit.edu/cre/students/faculty/pdf/rlease3.pdf Scroll down to page 4 for info on percentage rents.

Commercial Leases - Average Percentage Rents Charged in Commercial Leases This one has a nice chart showing typical percentage rents