70-90 Columbus are part of 50 Columbus Plaza which is currently under construction. 70 and 90 Columbus are to start construction in 2008 both towers will be 48 stories.
Here are some pictures of 50 Columbus Plaza which is almost complete.
The mid-rise section extending west from the main tower has a mini glass tower on the end now
Looking east down Columbus Drive, the Trump Tower rises in the background
Looking west down Columbus Drive with Grove Point in the background
Threaded Mode