An office building on the Bund, the Tundak Building, is located at 209 Yuanmingyuan Road. Originally the office building of the Chinese Baptist Church, it is a religious building. Later, the church published a publication entitled "Light of Truth", and the building was named "True Light Building". Dak had placed his own architectural design firm, the "Dak proofing line" in room 801 on the top floor