I'd love to have the Ping An tower, put it where WTC2 will rise, and call it a day.
What the city gains is a tower which restores the rising peaks for downtown. Sort of a 21st Century version of the 1930's peaks which graced the Lower Manhattan Skyline.
Credit: http://www.wantchinatimes.com/news-s...00063&cid=1206
It would also look aesthetically pleasing, as its in a location which would make it a signature tower for the area. Being surrounded by supertalls, its extra 600-800 ft gain over the roofs of WTC1 and WTC3 wouldn't look overpowering as it has a buffer thanks to the other tall towers.
Its glassy nature would do well to complement the trade complex. I also picked a Chinese Tower because quite frankly, the designs coming out of East Asia are pretty superior (some of them designed by Americans too) to most American super talls. Jin Mao could be another candidate, but this is the one tower that if I could steal, it would be it. Its a hard city to make a tower work in, AND STAND OUT, but something like this would do the job greatly, and only add to the aesthetics.
Going with the rules, some extra info:
1)
City taken: Shenzhen
2)
City its going in: NYC
3)
Site: 200 Greenwich Street