The typical asking rate per listing is in the $20's per square foot per year. The Butler submarket is going through a a rise in rates. In the last 3 months, the median rate went up $24 per sqft per year.
In the last 90 days, 3 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. 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 2,170 sqft. Most buildings in this area are around 5 floors. Most buildings in this market were built in 1978 and are Class A.