The typical asking rate per listing is in the $20's per square foot per year. The Upland region is going through a an increase in rates. In the last 3 months, the median rate increased $7 per sqft per year. That's a 38% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Upland region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 17 listings have been listed, which means office spaces might be 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 2,000 sqft. Most properties in this area are around 2 stories. Most buildings in this area were built in 1987 and are Class B.