"Those who hope that suburbia is finally growing up and starting to behave itself often cite this much-quoted line: 'Edge cities mean that density is back,' taken from Joel Garreau's 1991 book Edge City: Life on the New Frontier... In edgeless cities, one type of sprawl is apparent, a form of low-density office development that never reaches the scale, density, or cohesiveness of edge cities. Edgeless cities are everywhere but have been essentially overlooked. In terms of total office space, edgeless cities outnumber edge cities by a margin of nearly two to one, and they contain more office space than most downtowns."
Thanks to Urban Land Institute