Table 2 shows the descriptive statistics of the dataset that we assem-bled about these housing units. The median unit size for underground apartments is 9.73 m2. This is significant because 10 m2 is Beijing's reg-ulated minimum unit size. Although this size is much smaller than Bei-jing housing's overall average of 28.8 m2 per person, it is more than the 6.2 m2 per capita average size that currently exists in worker dormitory housing9 (Xie & Zhou, 2012).