In the last 90 days, 7 listings have come on the market, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About 14% of the available space in the Hales Corners 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this region are around 1 stories. Most buildings in this area were built in 1979 and are Class B.