On average, listings lease in the $20's per square foot per year. The Portage submarket is going through a a rise in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 21% increase in rent.
In the last 90 days, 9 listings have been posted online, which means listings 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,100 sqft. Most properties in this area are approximately 1 floors. Most buildings in this region were built in 1982 and are Class A.