If you're in the mood to check out some very nice apartments in environmentally responsible buildings this weekend, you could do a lot worse than Battery Park City. In fact, we'd be pretty astonished if you could do better. Three of the buildings on this week's tour—The Visionaire, Millennium Tower Residences, and Riverhouse—are green enough to be LEED-certified, and all five are classy enough to be Classy Name-certified (the other two are called The Soundings and 1 Rector Park.) And since they're all so close together, you can easily get between them using the most environmentally sustainable form of transportation (walking) or the least environmentally sustainable form of transportation (homemade jet-pack constructed out of aerosol cans.) That one's also the least effective.