Most listings are in the $20's per square foot per year. The Butler County submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 19% rise in rent.
In the last 90 days, 14 listings have been posted online, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 93% of the listings in the Butler County are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 630 sqft. Most buildings in this area are around 1 floors. Most buildings in this area were built in 1997 and are Class B.