Most listings are in the $20's per square foot per year. The Colorado submarket is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 2080 listings have been made available, so you'll want to check back regularly for new listings. About 3% of the office spaces in the Colorado are subleases, so you will probably have to focus your search on direct office leases. 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 2,110 sqft. Most properties in this market are close to 2 floors. Most buildings in this area were built in 1981 and are Class B.