Most listings are in the $20's per square foot per year. The Chino submarket is going through a decrease in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 21% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Chino region has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 4 listings have come on the market, which means listings might be 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,000 sqft. Most properties in this area are approximately 1 stories. Most buildings in this market were built in 2003 and are Class A.