Try to findd a commercial agent who is also a member of the ICSC - International Council of Shopping Centers. They publish a directory of every major tenant looking to rent space and what their criteria are. Also, go aroubnd other shopping centers in the area and see if anyone is interested in moving or opening up a second store. By the way... if yoy ever get kicked out of a shopping center for doing that (soliciting away tenants), we, in the commercial real estate field, consider it a 'badge of honor', kinda like a notch in a belt! It means you're working!
Good luck.
MRE