The typical asking rate per listing is in the $10's per square foot per year. The Sioux Falls submarket is going through a a rise in rates. In the last 3 months, the median rate increased $0 per sqft per year. That's a 2% increase in rent.
In the last 90 days, 93 listings have been posted online, so you'll want to check back regularly for new listings. About 3% of the listings in the Sioux Falls 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 870 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1992 and are Class A.