On average, listings lease in the $10's per square foot per year. The Colton region is going through a decline 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 region.
In the last 90 days, 31 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 830 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this market were built in 1987 and are Class B.