On average, listings lease in the $20's per square foot per year. The North Decatur submarket is going through a a rise in rates. In the last 3 months, the median rate increased $25 per sqft per year.
Compared to the rest of the Metro Atlanta market, the North Decatur submarket has less expensive rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 2 listings have been listed, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 200% of the available leases in the North Decatur 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 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 2,140 sqft. Most properties in this market are close to 2 stories. Most buildings in this area were built in 1976 and are Class B.