Most listings are in the $10's per square foot per year. The Waukesha region is experiencing a a boost in rates. In the last 3 months, the median rate increased $16 per sqft per year.
In the last 90 days, 8 listings have been posted online, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 113% of the office spaces in the Waukesha 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.
The standard measurement for office space in this area is around 1,330 sqft. Most buildings in this market are close to 1 floors. Most buildings in this region were built in 1983 and are Class B.