Most listings are in the $10's per square foot per year. The Colton submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 23% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Colton region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 23 listings have been listed, which means office spaces might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 9% of the listings in the Colton are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,750 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1985 and are Class B.