Take Line 2 to Lujiazui Station and then walk to Zheng Da Square. Very conspicuous. Halliday is on the 8th floor of Zheng Da Square.
List of stations along Metro Line 2
Songhong Road Station Beixinjing Station Weining Road Station Loushanguan Road Station Zhongshan Park Station Jiangsu Road Station Jing 'an Temple Station Nanjing West Road Station People's Square Station Nanjing East Road Station Lujiazui Station Dongchang Road Station Century Avenue Station Shanghai Science and Technology Museum Station Century Park Station Longyang Road Station Zhangjiang Hi-Tech Station