Number of storeys unknown [H99]

The number of storeys in the building above ground level is unknown. It is impossible to determine the number of storeys within an estimated range, or  an approximate number. Information is unavailable, or the building has not been inspected sufficiently to determine its number of storeys above ground.

It is difficult to determine number of storeys in the CCTV Headquarters building in Beijing, China based on the exterior view only (D. Willms)

A building with undefined number of storeys, Beijing, China (D. Willms)