The typical asking rate per listing is in the $30's per square foot per year. The Spearfish region is seeing a a rise in rates. In the last 3 months, the median rate increased $32 per sqft per year.
In the last 90 days, 15 listings have come on the market, which means listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 500 sqft. Most buildings in this region are approximately 1 floors. Most buildings in this market were built in 1995.