Most listings are in the $10's per square foot per year. The Marion region is seeing a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 8% decline in rent.
In the last 90 days, 6 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,250 sqft. Most buildings in this area are close to 1 stories. Most buildings in this area were built in 1979 and are Class B.