The typical asking rate per listing is in the $40's per square foot per year. The Rapid City submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $27 per sqft per year. That's a 171% increase in rent.
In the last 90 days, 56 listings have been made available, so you'll want to check back regularly for new listings. About 9% of the available leases in the Rapid City 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 130 sqft. Most properties in this region are around 2 floors. Most buildings in this market were built in 1984 and are Class B.