If the Damen Avenue Silos are demolished, they will take with them some of the final remains of Carl Sandburg’s poetic salute to Chicago: “Hog Butcher for the World, Tool Maker, Stacker of Wheat.” The stockyards closed more than a half-century ago. About the only trace of Chicago’s manufacturing glory is the forest of balconies tacked onto repurposed factories. Now the Silos’ owner, Michael ...