The typical asking rate per listing is in the $20's per square foot per year. The Colorado submarket is going through a a boost in rates. In the last 3 months, the median rate increased $26 per sqft per year.
In the last 90 days, 2080 listings have been posted online, so you'll want to check back regularly for new listings. About 86% of the available leases in the Colorado are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,450 sqft. Most properties in this area are approximately 2 floors. Most buildings in this region were built in 1981 and are Class B.