Most listings are in the $20's per square foot per year. The San Bernardino submarket is going through a a rise in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 50% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Bernardino region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 21 listings have come on the market, which means listings 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 3,760 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are close to 2 stories. Most buildings in this region were built in 1984 and are Class B.