POWER CENTER- A term also coming into prominence in the 1980s and '90s. This type of shopping center, an evolution of the 1950s strip center, is open-air and usually encompasses between 250,000 and 750,000 leasable square feet. It is geared toward middle-class clientele and has several big box-type retailers arranged in a row, either behind -or along both sides of- a large parking area.