Most listings are in the $20's per square foot per year. The San Dimas region is going through a a rise in rates. In the last 3 months, the median rate went up $25 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the San Dimas submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 25 listings have come on the market, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 32% of the listings in the San Dimas 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.
Even though the median size is 39,520 sqft, there are still 0 leases below 2,000 sqft. Most buildings in this market are approximately 2 floors. Most buildings in this region were built in 1988 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Utilities is the dominant industry in this region. Most of the folk of San Dimas work from home. Commuting between 30 and 45 minutes a day is the norm for those who opt to reside in this part of town.