On average, listings lease in the $10's per square foot per year. The Fontana submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 18% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Fontana submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 11 listings have come on the market, which means office spaces might be leasing quickly. 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.
The standard measurement for office space in this area is around 1,250 sqft. Most properties in this area are approximately 1 stories. Most buildings in this region were built in 1994 and are Class A.