From Luxury Listings NYC: The sky’s the limit for Robert Wiesenthal. The high-flying executive and founder of Blade — the Uber for helicopters — just bought a $15 million West Chelsea condo. The 12th floor unit at 551 West 21st Street is an upgrade from his former Upper East Side home at 147 East 63rd Street, which sold for $10.5 million in June 2015. [more] … [more]