On a desirable stretch of West Chelsea lined with high-profile residential buildings created by world-renowned architects like Zaha Hadid, Jean Nouvel, and Bjarke Ingels, a sophisticated condo is now up for grabs. Listed for $7,500,000 with Douglas Elliman’s Erin Boisson Aries, the condo is set in the Foster + Partners-designed 551 West 21st Street, a 19-story blue-chip building in the West Chelsea...