Introduction to Laofengxiang Silver Building: As a commercial totem, the Seventeenth House still witnesses the Ningbo Gang’s commercial miracle that happened in modern China. From here, we walked out of Laofengxiang Silver Building, Quan Sheng Credit Bureau, which was known as the largest private post office in China at that time, Minsheng Ink Factory, the predecessor of Hero Ink, and Butterfly sewing machines.