On average, listings lease in the $20's per square foot per year. The Decatur submarket is going through a a boost in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 27% increase in rent.
Compared to the rest of the Metro Atlanta market, the Decatur submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 18 listings have come on the market, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. 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 buildings in this market are approximately 8 floors. Most buildings in this area were built in 1974 and are Class A.