Most listings are in the $20's per square foot per year. The Boulder County submarket is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 11% decrease in rent.
In the last 90 days, 136 listings have been made available, so you'll want to check back regularly for new listings. About 10% of the office spaces in the Boulder County are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,340 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 1991 and are Class A.