The typical asking rate per listing is in the $10's per square foot per year. The Colton region is seeing a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 18% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Colton submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 22 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 9% of the listings in the Colton are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,100 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1985 and are Class B.