It means the phoenix’s nirvana.

Phoenix Hui is called Phoenix Hui because it was jointly invested and built by four companies including Beijing Sanyuan Group. It is an urban complex integrating residential, commercial, serviced apartments, offices and other multiple business formats; its name means Phoenix

Nirvana, Sanyuanqiao, where the project is located, is one of the most famous transportation hubs in Beijing. It was once known as "China's first national gate". The name Phoenix Hui implies its status and symbolic significance.