The building is about 20km from Beijing West Railway Station. Need to make a transfer if taking city bus: Bus 673 from West Railway Station to Dabeiyao Bei Station (Guomao Subway Station), change to 503 to Yansha Qiao Nan Station. Then walk rightside to the building. It may costs 50rmb for taxi fare.

Hi, Mr.kenny, the taxi fee is around CNY60.00 from Beijing West Railway Station to Beijing Sun Flower Tower.
Besides, you could also take buses, here is the route: take bus no 673 from Beijing West Railway station and shift to bus no 405 at Hujialou North Stop(呼家楼北), then get off at Yanshaqiao(燕莎桥), the tower is in the east of the stop within 200 meters.