From: maus@skypoint.com (John McClellan)
Subject: Re: Mall of America

853.1375
851.5125
854.4125
858.6125
859.6125
860.6125
861.4625 (old freq, may not be in use any more)
865.4625 (old freq...)

(program in this order, the first two channels have the highest volume of 
traffic {it is a trunked system})
464.825 Macy's security
154.070 Bloomington fire dept

also try the various itinerant business freqs (154.570, 154.600, 464.5, 
464.55 etc)

let me know if you hear any others... 

ps:
call signs are: 100's= security, 200's= housekeeping, 300's=operations, 
1300's=parking lot attendants.
Security uses standard APCO 10-codes.