Most listings are in the $20's per square foot per year. The Louisville submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 17% rise in rent.
In the last 90 days, 21 listings have been listed, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 5% of the listings in the Louisville are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,150 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1999 and are Class A.