590 Madison: former IBM Headquarters.
When Finch is on the laptop in Time Square you can see Jim Caviezel's character John Reese on the top left of one of the video screens.
The full text of the poem "Cocoon Above! Cocoon Below!" by Emily Dickinson is:
"Cocoon above! Cocoon below! / Stealthy Cocoon, why hide you so / What all the world suspect? / An hour, and gay on every tree / Your secret, perched in ecstasy / Defies imprisonment!
An hour in Chrysalis to pass, / Then gay above receding grass / A Butterfly to go! / A moment to interrogate, / Then wiser than a "Surrogate," / The Universe to know!"
"Cocoon above! Cocoon below! / Stealthy Cocoon, why hide you so / What all the world suspect? / An hour, and gay on every tree / Your secret, perched in ecstasy / Defies imprisonment!
An hour in Chrysalis to pass, / Then gay above receding grass / A Butterfly to go! / A moment to interrogate, / Then wiser than a "Surrogate," / The Universe to know!"
The binary riddle that shows up multiple times in the episode is "Cocoon Above! Cocoon Below!" by Emily Dickinson.