On average, listings lease in the $20's per square foot per year. The San Bernardino region is seeing a a rise in rates. In the last 3 months, the median rate rose $7 per sqft per year. That's a 33% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Bernardino region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 40 listings have been made available, which means new listings are probably 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 4,270 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this region are around 2 floors. Most buildings in this market were built in 1984 and are Class B.