The typical asking rate per listing is in the $30's per square foot per year. The Chino Hills submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 2% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Chino Hills region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 12 listings have been posted online, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. 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 buildings in this market are around 2 floors. Most buildings in this area were built in 2007 and are Class A.