One And Only Realty | 739 followers on LinkedIn. Exceeding Expectations in Luxury Real Estate: Your Premier Partner in New York and South Florida's Finest Properties | One And Only Realty, Inc. is an international boutique real estate company headquartered in New York City. We represent the interests of companies and individuals involved in luxury real estate transactions, including purchases and sales of apartments, houses and businesses. We specialize in a diverse portfolio of high-end properties, including exquisite and elite apartments in Manhattan, magnificent estates across Long Island, and sought-after properties within the broader New York metropolitan area.