New York-based Concierge Auctions is the dominant marketplace for buying and selling the world’s finest properties. Since its founding in 2008, Concierge’s business has spanned 40 U.S. states and 27 countries, resulting in over $2 billion in sales and many record-setting transactions. Concierge conducts a majority of its auctions online and through its mobile app, which can be downloaded from the Apple and Android app stores. Concierge recently received the “Best Overall Marketing” award from Who’s Who in Luxury Real Estate, a global collection of more than 130,000 real estate professionals in more than 60 countries, and has been named one of America’s fastest-growing companies by Inc. Magazine for the past five years.f