In the last 90 days, 0 listings have been listed, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the available leases in the Denver 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 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 sqft.