On average, listings lease in the $20's per square foot per year. The Cobb County region is going through a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 257 listings have been posted online, so you'll want to check back regularly for new listings. About 1% of the listings in the Cobb County are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,500 sqft. Most properties in this area are around 2 stories. Most buildings in this market were built in 1987 and are Class B.