How many floors are there in Xiaoliang thin-plate house in Hongkou District?

In Hongkou district, thin-plate houses with small beams are generally 3~4 floors. These old communities are generally 3~4 floors. Because this building material can maximize the use of space, many houses in Shanghai in the 1960s and 1970s were thin-walled houses with small beams. But the risk factor of this kind of house is particularly high, and the service life of the house is not very long. Because these thin-walled houses with small beams are concentrated in the old city of Shanghai, there is no way to dismantle them and they can only be rebuilt.