Dongcheng District ------ Wangfujing/Dongdan
Xicheng District ----Dianmen/Shishahai Xizhimen/Zoo Xidan/Xisiisi Si
Haidian District ---- Wudaokou Zhongguancun
All of these places are centralized ~~
There is very little in Beijing that is particularly upscale. In fact, there are very few upscale restaurants in Beijing. It's also not centralized.
Chaoyang District has more food~~Beijing's local cuisine is also very concentrated~~