I think you have a good one there. Whenever I fly into Dulles I am amazed at the spread of high-rises along the access road. How about "high-rise sprawl" or "tall sprawl?"This isn't one that really qualifies as making up terminology, but I remember when 10 or so years ago, I used the phrase "high density sprawl" to refer to the development pattern around I-66 in Northern Virginia when speaking to peers. Many of them acted like I blew their darn minds with the idea that sprawl could be high density, or that dense areas could be sprawling. Does anyone have a better term for what I am describing?