Most listings are in the $20's per square foot per year. The Greenfield submarket is seeing a a rise in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 25% increase in rent.
Compared to the rest of the Milwaukee County market, the Greenfield submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 22 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 900 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 1986 and are Class B.