Most listings are in the $30's per square foot per year. The Rialto submarket is going through a a rise in rates. In the last 3 months, the median rate increased $32 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Rialto region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 3 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 3,060 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this region are close to 1 stories. Most buildings in this area were built in 2000 and are Class A.