Compared to the rest of the Metropolitan Los Angeles market, the Apple Valley submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 6 listings have been made available, which means leases most likley are going fast. 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 710 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 1990 and are Class B.