21W20 Flatiron is a boutique residential development of thirteen full-floor homes located in the heart of New York City. Each of the homes features floor-to-ceiling southern exposure and is integrated with the latest green and home automation technology. The building is pursuing WELL Multifamily Residential Certification – Pilot Program. 21W20 Flatiron is built by Gale International, a private real estate development company with roots dating back to 1922. The company has developed 20 million square feet of LEED Certified space. Gale International is best known as the developer of Songdo International Business District, a 1,500 acre, USD $35 billion city located in South Korea.