The typical asking rate per listing is in the $20's per square foot per year. The Colorado submarket is going through a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decline in rent.
In the last 90 days, 1927 listings have come on the market, so you'll want to check back regularly for new listings. About 4% of the available space in the Colorado are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,190 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 1981 and are Class B.