Deutsche Pfandbriefbank warned that the commercial real estate sector faces a crisis on par with the 2008 downturn.Reinhard Krause/Reuters Deutsche Pfandbriefbank AG said it's bracing for an ongoing decline in commercial real estate. It called the downturn "the greatest real estate crisis since the financial crisis." Shares of the German bank have declined about 25% year-to-date. Signs of commercial real estate distress continue to mount, with the latest warning coming from German lending giant Deutsche Pfandbriefbank AG.