There are lots of good market reports out there, but an average is just an average. Every market, submarket, property type and even every building vary. Who are the tenants, where is the building located, what's the competition like, what's the future competition look like, what are employers in that neighborhood doing, etc. etc.
Contacting a professional/broker is a great start, another source is a good commercial appraiser. If you need specific referrals, let me know. I appraised office/industrial/retail in SoCal for many years.
Jan 16, 2009