Most listings are in the $20's per square foot per year. The Thornton submarket is going through a a rise in rates. In the last 3 months, the median rate increased $23 per sqft per year.
Compared to the rest of the Denver Metro market, the Thornton region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 1 listings have come on the market, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 1,700% of the available leases in the Thornton 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 posted, so finding a space for a small business might be tough.
Even though the median size is 26,390 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are close to 2 floors. Most buildings in this market were built in 1984 and are Class B.