Hi Cletus220:
Do you mean the Bridgeport Village in Tigard?
If so, this is a long shot... but try 464.475 and 469.475. If these are the right frequencies, typically security will be on one and custodial services on the other. These freqs are licensed to OPUS Management Northwest LLC, which is connected to CenterCal Properties, the owner of Bridgeport. Hope these work. Another alternative would be to sit outside the mall on a busy night with your scanner set to search mode and see what pops up.
Security at Bridgeport is in-house so the security freqs should generally be licensed to the property owning entity or management firm.
Good luck!