On average, listings lease in the $20's per square foot per year. The Upland region is going through a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decrease in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Upland submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 12 listings have been posted online, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 25% of the office spaces in the Upland are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 910 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1987 and are Class B.