Standing on the trash-sprinkled front steps of the Schrager Auction Galleries, 2915 N. Sherman Blvd., Wolfgang Rosenau recalls the deathbed conversation he had with the building's late owner, auctioneer Al Schrager. It was September 2013 when Schrager, by then too weak to speak, squeezed the hand of Rosenau, his friend and fellow antiques dealer, acknowledging Rosenau's promise to help find a suitable owner for his beloved auction house.