On average, listings lease in the $30's per square foot per year. The Claremont region is experiencing a a rise in rates. In the last 3 months, the median rate rose $35 per sqft per year.
Compared to the rest of the Metropolitan Los Angeles market, the Claremont submarket has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 2 listings have come on the market, which means new availabilities most likley are going fast. 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 market are approximately 1 stories. Most buildings in this area were built in 2003 and are Class B.