On average, listings lease in the $50's per square foot per year. The Jefferson County submarket is going through a a boost in rates. In the last 3 months, the median rate increased $44 per sqft per year. That's a 275% increase in rent.
In the last 90 days, 3 listings have come on the market, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 200% of the listings in the Jefferson County 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 available, 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 properties in this region are around 2 floors. Most buildings in this market were built in 1960 and are Class A.