CTBUH has this listed: Project Commodore 502 m.
Anyways, to feed the NY Ego:
In the wise words of a Ukrainian from Brighton Beach named Bufera, when you build one super tall, it is a tragedy, when you build 30+... it is a statistic.
Some need updating. Like 250 Water and 80 South I doubt will happen. Damn nimbys on 250 water.