At the back of Lufthansa Mall and Kempinski Hotel, on the other side of the river, there is a street called Maizidian Xijie. It also known as Lady's Street for there is a market mainly selling women's clothes. There is also a flower market as well as some stores. It is very closed to Sanlitun from there. To find some very local looking street, I think you should get to the city center to see Da Zha Lan, Qianmen Dajie, Wangfujing etc.