Most listings are in the $10's per square foot per year. The Upland submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 11% 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 undervalued region.
In the last 90 days, 33 listings have been posted online, which means listings are probably leasing quickly. 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 1,000 sqft. Most properties in this market are around 2 stories. Most buildings in this area were built in 1986 and are Class B.