The two main things that tend to kill the viability of tall, thin towers in the US are the massive core infrastructure mandated by fire codes and the ADA (two or more full-sized elevators, two fully-enclosed stairwells, at least one of which can be reached without passing through a room containing an elevator), and FAR restrictions, which makes habitable square footage in areas dense enough to merit such towers in the first place artificially scarce.
It's too bad that zoning laws aren't stacked in favor of fewer, bigger units. If anyone with a 100 x 100 urban lot could build a tower as a matter of right with a 2-story retail or townhome-lined pedestal filling the lot's buildable area, another 2-4 stories of pedestal for parking, private roof garden, and pool set back another 20', and a tower of unlimited height (subject to FAA veto, sadly) and unlimited FAR as long as the tower itself has a footprint equal to 50% of the pedestal area or less, with a maximum size in any dimension equal to 2/3 the pedestal's size, and each unit had at least 1000sf plus 500sf per bedroom, and the only constraints were purely economic -- the cost of building acre upon vertical acre of cheaply-carpeted concrete floor plates -- I think tall, thin towers would quickly become the vertical McMansions of urban America.
Imagine how cool it would be if you could buy a 3600sf 4 bedroom, 4.5 bath condo with 4 deeded parking spaces in the garage, formal living and dining rooms IN ADDITION to the usual great room, plus home theater & a bonus room or two occupying 1/4 of 3 floors (or half of 2 floors, or all of one floor) in a tall, thin tower for something like $150/sf or less...
A cool, but brutally expensive one about to get built in Miami; one unit per floor. I'm guessing the tower is around 55 x 55 feet; no idea how big the pedestal is... based on average lot sizes in the area and setbacks for residential towers, I'm going to guess around 60 x 70 feet if it's sitting on a 100 x 100 lot, and maybe 60 x 120 feet if it's sitting on two back-to-back lots (100 x 200).
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