On average, listings lease in the $20's per square foot per year. The La Verne submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $24 per sqft per year.
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 discounted submarket.
In the last 90 days, 2 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the available leases in the La Verne are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this region were built in 1994 and are Class B.