The typical asking rate per listing is in the $30's per square foot per year. The San Bernardino submarket is going through a a boost in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 6% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Bernardino submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 34 listings have been made available, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 85% of the available leases in the San Bernardino are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 6,610 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1984 and are Class B.