On average, listings lease in the $10'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 $1 per sqft per year. That's a 7% decrease in rent.
In the last 90 days, 30 listings have been made available, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Louisville/Jefferson County metro government (balance) are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most buildings in this region are close to 1 stories. Most buildings in this area were built in 1954 and are Class A.