On average, listings lease in the $90's per square foot per year. The Riverside submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $95 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 4 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 6,000 sqft, there are still 0 leases below 2,000 sqft.