The typical asking rate per listing is in the $20's per square foot per year. The Louisville/Jefferson County metro government (balance) region is going through 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, 33 listings have been listed, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the available space in the Louisville/Jefferson County metro government (balance) are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 4,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are approximately 1 stories. Most buildings in this area were built in 1950 and are Class A.