On average, listings lease in the $10's per square foot per year. The San Bernardino region is going through a decrease in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 36% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Bernardino submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 70 listings have been made available, so you'll want to check back regularly for new listings. About 6% of the office spaces in the San Bernardino are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 660 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 1984 and are Class B.