Most listings are in the $20's per square foot per year. The Upland region is experiencing a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 7% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Upland submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 12 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 8% of the available leases in the Upland are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,170 sqft. Most buildings in this area are close to 2 floors. Most buildings in this area were built in 1987 and are Class B.