Most listings are in the $20's per square foot per year. The McDonough region is going through a a boost in rates. In the last 3 months, the median rate increased $24 per sqft per year.
Compared to the rest of the Metro Atlanta market, the McDonough submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 2 listings have come on the market, which means new listings might be leasing quickly. You'll want to be prepared to make an offer immediately. About 350% of the listings in the McDonough 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 650 sqft. Most properties in this market are close to 1 floors. Most buildings in this market were built in 2007 and are Class B.