Most listings are in the $10's per square foot per year. The Chino region is seeing a decline in rates. In the last 3 months, the median rate fell $4 per sqft per year. That's a 17% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Chino submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 1 listings have come on the market, which means spaces are probably going fast. 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 910 sqft. Most buildings in this market are around 1 floors. Most buildings in this region were built in 2003 and are Class A.