The typical asking rate per listing is in the $10's per square foot per year. The Decatur region is experiencing a decline in rates. In the last 3 months, the median rate fell $13 per sqft per year. That's a 40% decline in rent.
Compared to the rest of the Metro Atlanta market, the Decatur region has lower rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 4 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 2,200 sqft. Most properties in this market are around 8 floors. Most buildings in this region were built in 1966 and are Class A.