3rd floor, No.111 Zhongshan South Road. According to the website of Nanjing Municipal People's Government, the address of Nanjing Gulou District Maintenance Fund Office is 3/F, No.111 Zhongshan South Road. If the house under investigation is a commercial house, a letter of introduction from the owners' committee is required; If the house under investigation is a reformed house, you need to bring a letter of introduction from the selling unit to Nanjing Public Housing Management Center for enquiry.