Rosemary Beach is an unincorporated master planned community in Walton County, Florida, United States on the Gulf Coast. Rosemary Beach is developed on land originally part of the older Inlet Beach neighborhood. The town was founded by Guy Chesterfield Sr. in 1995, and was later designed by Duany Plater Zyberk & Company. The town is around 105 acres (0.42 km2) and upon completion had just over 500 homesites and a mixed use town center with shops, restaurants, and activities. The town is a master-planned community located on a beachside road, 30-A. The streets are narrow and lined with native plants and trees.