Affectionately known as the Art Deco District, the Miami Beach Architectural District embodies the city's design continuum from its early development in the 1910s to the construction boom following World War II. It was listed on the National Register of Historic Places in 1979 largely through the efforts of Barbara Baer Capitman, founder of the Miami Design Preservation League. At that time, it was the youngest district on the National Register because many of its buildings had not yet reached 50 years of age. Its one-square-mile area includes over 800 significant structures, with principal architectural styles including Mediterranean Revival, Art Deco, Streamline Moderne, and Miami Modern, or MiMo.