Most listings are in the $20's per square foot per year. The Des Moines region is experiencing a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 4% increase in rent.
In the last 90 days, 192 listings have been posted online, so you'll want to check back regularly for new listings. About 1% of the listings in the Des Moines are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 9,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 1975 and are Class B.