the thing I am mostly interested in is what kind of company And / or industry that the owner owns or being in charge of? CEO of a big size listed firm or he is the owner?
the biggest One I ever visited is my uncle. he owns a listed company. but still not comparable to the one you mentioned, 50 toilets!
actually in overseas, 3 storey house is not uncommon. they are in fact inconvenient to elderly who cannot walk fast or with difficult mobility. unless One lives in the one that has elevator installed!