The typical asking rate per listing is in the $10's per square foot per year. The Portage region is going through a an increase in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 10% increase in rent.
In the last 90 days, 53 listings have been made available, so you'll want to check back regularly for new listings. 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 880 sqft. Most properties in this area are around 1 floors. Most buildings in this market were built in 1982 and are Class Class A.