"The online deals at Tribeca Spa of Tranquility are great," says Francesca Kennedy, founder of the sandal company Ix. "I highly recommend a Korean scrub—you'll never feel cleaner in your life!"
Plus: One World Trade Center solves its glass problem; Tribeca artists' country house; PayPal's pop-up product; doubling down at River Lofts; dissecting a sale at 335 Greenwich; Batman to film on Wall Street this weekend.