Most listings are in the $20's per square foot per year. The Caldwell submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $26 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 5 listings have been listed, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. 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 780 sqft. Most buildings in this market were built in 1957 and are Class B.