The typical asking rate per listing is in the $20's per square foot per year. The Louisville/Jefferson County metro government (balance) submarket is experiencing a a boost in rates. In the last 3 months, the median rate increased $23 per sqft per year.
In the last 90 days, 30 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 120% of the available leases 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.
The standard measurement for office space in this area is around 1,680 sqft. Most properties in this area are approximately 1 stories. Most buildings in this market were built in 1954 and are Class A.