When a blocked sewer caused major water damage to the 1891-1892 Louis Sullivan- and Frank Lloyd Wright-designed Charnley-Persky House in Chicago’s Gold Coast neighborhood in August 2014, the Society of Architectural Historians (SAH), which has owned the building since 1995, was quick to repair the damage. But the extent of the damage and abruptness of the repair left the SAH thinking that it needed to do something more to preserve the national historic landmark.