Most listings are in the $20's per square foot per year. The Middleton submarket is going through a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 14% rise in rent.
In the last 90 days, 17 listings have come on the market, which means leases might be leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the available space in the Middleton are subleases, so you will probably have to consider a longer term 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 2,270 sqft. Most properties in this market are approximately 2 floors. Most buildings in this market were built in 1995 and are Class A.