Most listings are in the $20's per square foot per year. The Foothill Corridor region is going through a an increase in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 12% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the Foothill Corridor submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have been made available, which means 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 1,760 sqft. Most buildings in this area were built in 1983 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Company management is the dominant industry in this area. Most of the folk of Foothill Corridor work from home. Commuting under 5 minutes a day is the norm for those who opt to reside in this part of town.