Most listings are in the $10's per square foot per year. The Louisville submarket is seeing a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 14% decrease in rent.
In the last 90 days, 19 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available space in the Louisville are subleases, so you will probably have to focus your search on direct office leases. 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 1,610 sqft. Most buildings in this market are close to 2 stories. Most buildings in this region were built in 1999 and are Class A.