The typical asking rate per listing is in the $10's per square foot per year. The Brown Deer region is going through a an increase in rates. In the last 3 months, the median rate went up $20 per sqft per year.
Compared to the rest of the Milwaukee County market, the Brown Deer region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 6 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 150% of the available leases in the Brown Deer 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 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 2,440 sqft. Most properties in this region are close to 2 stories. Most buildings in this area were built in 1982 and are Class B.