A building on Ningbo Road in Shanghai, March 30, 2019. The unique design of the structure, making it appear on one end as just the facade of a building standing along a street, is actually a polygonal design. [Photo: VCG]"

A building on Ningbo Road in Shanghai, March 30, 2019. The unique design of the structure, making it appear on one end as just the facade of a building standing along a street, is actually a polygonal design. [Photo: VCG]"

The thinnest part of the building measures only around 20 centimeters in width, Ningbo Road, Shanghai, March 30, 2019. [Photo: VCG]"

File photo taken in December, 2013 shows another end of the thin house where residents have enough living space, Ningbo Road, Shanghai. [Photo: IC]"