Most listings are in the $10's per square foot per year. The Wauwatosa region is going through a decline in rates. In the last 3 months, the median rate fell $7 per sqft per year. That's a 29% decrease in rent.
Compared to the rest of the Milwaukee County market, the Wauwatosa region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 13 listings have been posted online, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 115% of the available space in the Wauwatosa are subleases, so you might be able to snag a great spot on a short term. 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 2,280 sqft. Most properties in this region are around 3 floors. Most buildings in this market were built in 1975 and are Class B.