Prince Gong's Mansion in Beijing, first built in the 18th century, underwent an unprecedented large conservation and renovation at the beginning of this century. Unlike former maintenance projects, the conservation and renovation kept the different historical information left on every single structure of the architectural complex. The complex's historical changes over 200 years were recovered through study of records and historical documents.

The renovation project is scientific, integrated and advanced, reflecting the characteristics of contemporary Chinese historical building protection work. The project insists on using original materials, structures and techniques in the mansion's renovation. Various scientific measures were applied to the conservation. Through archaeological evacuation, experts identified the mansion's missing parts. Recovery design is further determined from the Yangshi Lei architectural archives, historical records and old photos. Moreover, the project tries to recover the authentic old design and structure, as the complex's layout was changed in modern times.

The project not only restored the mansion's broken and missing parts and recovered its old look, but also added facilities for security, fire-prevention, lighting, heating and air-conditioning. The mansion, after its conservation and renovation, now also functions as a museum.