On average, listings lease in the $20's per square foot per year. The Roswell region is going through a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 16% increase in rent.
Compared to the rest of the Metro Atlanta market, the Roswell submarket has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 34 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 3% of the available leases in the Roswell are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 3,020 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are approximately 1 stories. Most buildings in this area were built in 1996 and are Class B.