From left: Rendering of 2 World Trade Center, 388 Greenwich Street and 390 Greenwich Street

As the clock ticks on Citigroup's 399 Park Avenue headquarters lease, the bank is zeroing in on a new nerve center.

http://therealdeal.com/blog/2013/10/03/citigroup-eyes-hq-spots-as-clock-ticks-on-park-ave-lease/