Most listings are in the $20's per square foot per year. The Milwaukee region is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 11% decline in rent.
Compared to the rest of the Milwaukee market, the Milwaukee region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 234 listings have been listed, so you'll want to check back regularly for new listings. About 3% of the listings in the Milwaukee are subleases, so you will probably have to consider a longer term 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 3,590 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are around 3 floors. Most buildings in this region were built in 1968 and are Class B.