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Our store also has this situation, the only way is to set it off, and then let the engineering staff of each shift check one side before opening the file, and deal with it in time.
Yes, it is not a sewage well, there should be a sewage pipe on the ceiling of the bottom merchant.
There are public toilets in the shopping malls and shops under the apartments. And the facilities of the public toilet are very good and the environment is good.
Of course, that's your home. Tell me first, or call the police if it doesn't work.
It's not very good, it is generally not recommended to have steps at the door to do business, even if there are steps, it is best to go up, which has something to do with feng shui.
Commercial buildings are practical and economical, and image and temperament are emphasized, and better services are preferred in limited space.