Most listings are in the $30's per square foot per year. The San Dimas submarket is going through a a boost in rates. In the last 3 months, the median rate increased $14 per sqft per year. That's a 58% rise in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Dimas submarket has more expensive rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 25 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 12% of the available leases in the San Dimas are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 4,160 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this area are close to 2 stories. Most buildings in this area were built in 1988 and are Class B.