Chengqilou, Gaobei village, Yongding county. 
Ground floor plan     (see also:  3rd-floor plan)

 

"Of all the circular dwellings with internal open galleries, the most famous is the Chengqilou in Yongding county built in 1709, which used to house 80 families, totaling more than 600 people in its prosperous days. The most significant feature of this huge collective dwelling is that alle residents are equal in their share of living spaces. No traces of the feudal patriachal distinctions between senior members of the family and the younger generations predominant in the  "Five Phoenix" (Fuyulou) type of dwellings can be found here. Such a mode of tribal habitation is a rare phenomenon in the feudal days". 
(Text: Huang Hanmin in "Building in China", Dec. 1989, Vol. 2, No. 4, p.33)

(Plan drawing: Mogi, Keiichiro: "Zhongguo minju yanjiu" 
[A Survey of Chinese Dwellings], Taibei 1996)