Most listings are in the $10's per square foot per year. The Kennesaw region is experiencing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 6% decline in rent.
Compared to the rest of the Metro Atlanta market, the Kennesaw region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 18 listings have been posted online, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,250 sqft. Most properties in this market are approximately 2 stories. Most buildings in this area were built in 2006 and are Class B.