Most listings are in the $10's per square foot per year. The Fernandina Beach submarket is experiencing a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 3% decline in rent.
In the last 90 days, 6 listings have come on the market, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. 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 2,400 sqft. Most properties in this area are approximately 2 stories. Most buildings in this region were built in 2002 and are Class B.