Given all the attention that NYC real estate heads gave 8 Spruce Street, the game-changing new luxury rental building in the Financial District designed by Frank Gehry, it's something of a surprise that there are things about the building we don't already know. Any Manhattan real estate watcher can quote you the starting prices for studio apartments for rent at 8 Spruce Street -- around $2,600, if you were wondering -- and of course the name of the star architect behind this most well-observed of Financial District rental listings is right there in one of 8 Spruce Street's alternate names, New York By Gehry. But for all this celebrity luxury rental listing's sky-high profile, it's something of a secret that 8 Spruce Street belongs among on any list of green rental listings in Manhattan. And while that secret is out, there's also a reason why 8 Spruce Street isn't flacking its green building bona fides.