There is no space in the middle, except the capital letter. However, minority place names (such as Hohhot) generally have their own fixed English words. Beijing is the political and cultural center of China.
Beijing is the political and cultural centre of China.
After consultation, a new round of preparatory talks will be held in Beijing.
It was agreed that another round of preliminary talks would be held in Peking
Beijing is the busiest. The business district is around Wangfujing Street.
The busiest shopping district in Beijing is around Wangfujing Street.
We made a survey on the living conditions in Beijing.
We carried out a survey of the living conditions in Beijing.
The American guests arrived in Beijing yesterday afternoon.
The American visitors arrived in Beijing yesterday afternoon.