Most listings are in the $30's per square foot per year. The Claremont region is experiencing a an increase in rates. In the last 3 months, the median rate went up $35 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Claremont region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 1 listings have been made available, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,180 sqft. Most buildings in this region are around 1 floors. Most buildings in this area were built in 2003 and are Class B.