In the last 90 days, 13 listings have come on the market, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 31% of the available space in the Fontana 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this region are around 1 stories. Most buildings in this region were built in 1991 and are Class A.