Most listings are 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 rose $8 per sqft per year. That's a 50% rise in rent.
In the last 90 days, 11 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 91% of the available leases in the Portage are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 4,650 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are approximately 1 floors. Most buildings in this market were built in 1982 and are Class A.