Most listings are in the $20's per square foot per year. The Boulder region is seeing a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 17% increase in rent.
In the last 90 days, 211 listings have been made available, so you'll want to check back regularly for new listings. About 5% of the office spaces in the Boulder are subleases, so you will probably have to consider a longer term 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 2,830 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this area were built in 1984 and are Class A.