Not only is Gary Barnett's Extell Development Company among the most prolific developers of residential real estate in New York City, many of its projects—from the cantilevering-over-a-historic-building 217 West 57th Street, to the cantilevering-over-a-church 1010 Park Avenue, to the not-cantilevering-over-anything-but-still-discussed-ad-nauseum One57—are fraught with controversy. Extell has so many irons in the fire, and so many of those irons are actually interesting, that it can be near impossible to keep track of them all. And with that in mind, we've put together this handy map of every Extell development site in the borough of Manhattan. Are we missing any? Let us know in the comments section.