Perforated bathroom floor. The property does not agree.

There is no way to disagree with the perforated bathroom floor.

There will be ventilation pipes in the bathroom without windows. You can use a fan.

Although it is slow, many houses are like this now.

If you open a hole in the external wall, the structure will not be affected, but the seismic effect will be much reduced, and the property will not be spared.