Many quick serve restaurants pay rent based on a percentage of gross annual sales. The percentage can range widely based on the location and sales volume, but as an example, a restaurant that grosses $1 million per year, and pays 7% of gross sales as rent for a 1,200 SF store, would translate into a SF annual rent of $58.33/SF. I think you will find a "typical" percentage rent range of between 6 and 12% NNN, though again, many factors can effect this range. You can check Dollars and Cents, a national publication, for typical occupancy costs based on use type. Good luck!
Mar 8, 2012