On average, listings lease in the $20's per square foot per year. The La Verne region is seeing a a rise in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 12% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the La Verne region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 2 listings have been listed, which means spaces are probably 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 1,760 sqft. Most buildings in this area are close to 2 floors. Most buildings in this market were built in 1994 and are Class B.