Most listings are in the $30's per square foot per year. The Chino region is going through a an increase in rates. In the last 3 months, the median rate increased $14 per sqft per year. That's a 72% increase 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 discounted region.
In the last 90 days, 10 listings have been made available, which means new availabilities might be going fast. You'll want to be prepared to make an offer immediately. About 60% of the office spaces in the Chino are subleases, so you might be able to find a shorter term or below market rent. 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 2,270 sqft. Most buildings in this market are close to 1 floors. Most buildings in this region were built in 2003 and are Class A.