Most listings are 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 rose $22 per sqft per year.
In the last 90 days, 4 listings have been made available, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 150% of the available leases in the Decatur are subleases, so you might be able to find a shorter term or below market rent. 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 2,200 sqft. Most buildings in this market are close to 2 stories. Most buildings in this area were built in 2013 and are Class C.