On average, listings lease in the $20's per square foot per year. The Lilburn submarket is going through a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 25% rise in rent.
Compared to the rest of the Metro Atlanta market, the Lilburn region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 3 listings have been listed, which means new listings 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 market are approximately 1 stories. Most buildings in this region were built in 1986 and are Class C.