On average, listings lease in the $20's per square foot per year. The Delafield submarket is going through a a rise in rates. In the last 3 months, the median rate went up $21 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 2 listings have been posted online, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,660 sqft. Most buildings in this area are around 3 floors. Most buildings in this area were built in 1999 and are Class B.