Most listings are in the $20's per square foot per year. The Riverside submarket is experiencing a an increase in rates. In the last 3 months, the median rate went up $28 per sqft per year.
In the last 90 days, 4 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 75% of the office spaces in the Riverside 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 available, so finding a space for a small business might be tough.
Even though the median size is 2,610 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are close to 2 stories. Most buildings in this market were built in 2008 and are Class A.