Most listings are in the $10's per square foot per year. The Claremont region is experiencing a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 4% decline in rent.
In the last 90 days, 9 listings have been posted online, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 56% of the available space in the Claremont 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 860 sqft. Most properties in this region are close to 2 stories. Most buildings in this area were built in 1926 and are Class Class B.