The island of Manhattan boasts so many soaring towers, that it’s hardly news when a new one shoots up—even if its spire pierces the clouds. That said, now and then, there’s an exception in the form of an ambitious architectural masterpiece, like the west side’s new 90-story Affirmation Tower, a five-tiered, terrazzo-clad skyscraper that, upon closer inspection, appears to be upside down. Developed by Don Peebles, the chief operating officer at the Peebles Corporation, and designed by AD100 architect Sir David Adjaye, Affirmation Tower is as symbolic as it is enormous (1,663 feet tall and two million square feet.) Not...