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 Patrick D. Bienvenue as President of Leucadia Financial Corporation in 1995, and was designed by Duany Plater-Zyberk & Company. The town is around 105 acres (0.42 km2) and upon completion had just over 400 homesites and a mixed use town center with shops, restaurants, and activities. The town is a master-planned community located on a beachside road, CR 30A.