Most listings are in the $20's per square foot per year. The Lower Arapahoe region is experiencing a an increase in rates. In the last 3 months, the median rate rose $26 per sqft per year.
In the last 90 days, 0 listings have been made available, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the listings in the Lower Arapahoe 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 available, 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 buildings in this market were built in 1930.