The typical asking rate per listing is in the $40's per square foot per year. The Rapid City region is experiencing a an increase in rates. In the last 3 months, the median rate went up $27 per sqft per year. That's a 171% rise 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 14% of the office spaces in the Rapid City are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, 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 market are around 2 floors. Most buildings in this area were built in 1984 and are Class B.