On average, listings lease in the $10's per square foot per year. The Victorville region is going through a decline in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 13% decline in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Victorville submarket has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 31 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,640 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1989 and are Class B.