Most listings are in the $10's per square foot per year. The Suwanee region is seeing a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 22% decrease in rent.
Compared to the rest of the Metro Atlanta market, the Suwanee region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 8 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 1,400 sqft. Most properties in this area are around 3 stories. Most buildings in this region were built in 2005 and are Class B.