On average, listings lease in the $30's per square foot per year. The San Dimas submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $11 per sqft per year. That's a 45% increase in rent.
Compared to the rest of the Metropolitan Los Angeles market, the San Dimas region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 25 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 8% of the available space in the San Dimas are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet posted, 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 buildings in this region are close to 2 floors. Most buildings in this region were built in 1988 and are Class B.