Compared to the rest of the Metro Atlanta market, the Riverdale region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have been posted online, which means leases 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,000 sqft. Most buildings in this market are close to 1 stories. Most buildings in this area were built in 2003 and are Class B.