On average, listings lease in the $20's per square foot per year. The Jefferson County submarket is going through a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 11% increase in rent.
In the last 90 days, 165 listings have been made available, so you'll want to check back regularly for new listings. About 4% of the listings in the Jefferson County are subleases, so you will probably have to consider a longer term 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 1,800 sqft. Most buildings in this region are approximately 2 stories. Most buildings in this area were built in 1983 and are Class B.