Most listings are in the $20's per square foot per year. The Louisville/Jefferson County metro government (balance) submarket is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 30 listings have come on the market, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 153% of the available space in the Louisville/Jefferson County metro government (balance) 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 posted, so finding a space for a small business might be tough.
Even though the median size is 4,350 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this area are approximately 1 floors. Most buildings in this market were built in 1959 and are Class A.