Most listings are in the $10's per square foot per year. The Richmond County region is going through a decline in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 17% decline in rent.
In the last 90 days, 85 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the available space in the Richmond County are subleases, so you will probably have to consider a longer term lease. 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 1,800 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this area were built in 1978 and are Class B.