Lifestyle center, as used in commercial development in the United States, a is a shopping center or mixed-used commercial development that combines the traditional retail functions of a shopping mall but with leisure amenities oriented towards upscale consumers. Lifestyle centers, which were first labelled as such by Memphis developers Poag & McEwen in the late 1980s [1] and emerged as a retailing trend in the late 1990s, are sometimes labeled "boutique malls" and are often located in affluent suburban areas. The proliferation of lifestyle centers in the United States accelerated in the 2000s, with number going from 30 in 2002 to 120 at the end of 2004 [2]. Lifestyle centers are sometimes depicted as occupying the upscale end of the spectrum of commercial development, at the opposite end of the outlet mall, which typically caters to a wider range of income with bargain prices. The growth of lifestyle centers had occurred at the same time of an acceleration of the shutting down of traditional shopping malls, which typically require large sites over 70 acres (283,000 m²) at a time when land prices are escalating. The construction of lifestyle centers usually require less land and generate higher revenue margins, often generating close to 500 dollars per square foot, compared to an average of 330 dollars per square foot for a traditional mall [citation needed]. Typical amenities at lifestyle centers include plush chairs instead of traditional plastic seating in common areas.