Compared to the rest of the Metro Atlanta market, the Brookhaven submarket has higher rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 19 listings have been listed, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available leases in the Brookhaven are subleases, so you will probably have to focus your search on direct office leases. 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 1,970 sqft. Most properties in this market are around 5 floors. Most buildings in this market were built in 1983 and are Class A.