Why Sell at Auction? Auctions are quickly becoming the leading method of selling all types of real estate. Hagen Realty Group has over 22 years of experience in selling real estate at auction. Whether you have one property or a portfolio of properties, Hagen Realty Group will develop the best marketing solution for your property that will quickly achieve successful results. And if an auction is not the right fit for you, the team at Hagen Realty Group can assist you with an accelerated marketing plan to best suit you and your property.