Most listings are in the $20's per square foot per year. The Johnston region is going through a a rise in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 20 listings have been posted online, which means new listings are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 35% of the listings in the Johnston 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 available, so finding a space for a small business might be tough.
Even though the median size is 5,000 sqft, there are still 0 listings below 2,000 sqft. Most buildings in this region are around 1 floors. Most buildings in this area were built in 2002 and are Class B.