On average, listings lease in the $30's per square foot per year. The Dunwoody submarket is experiencing a an increase in rates. In the last 3 months, the median rate increased $30 per sqft per year.
Compared to the rest of the Metro Atlanta market, the Dunwoody submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 30 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 130% of the listings in the Dunwoody are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,250 sqft. Most properties in this region are approximately 3 floors. Most buildings in this area were built in 1983 and are Class A.