The typical asking rate per listing is in the $20's per square foot per year. The Rancho Cucamonga submarket is going through a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 14% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Rancho Cucamonga region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 36 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 181% of the available space in the Rancho Cucamonga are subleases, so you might be able to snag a great spot on a short term. 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 2,130 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1991 and are Class B.