Mmm, grandparents had something like that in the 60s . I think there were about 15 upstairs rooms, two full bathrooms, two loos, two kitchens, huge pantry, three or four big reception rooms . Would have been a mansion at one stage - even with that size they only had half .
Don’t ask how they afforded it, I have no idea and never asked .
Sold a quarter or so in the 70s - built walls between the two - and made a fortune .
They still - after selling - had three bedrooms, a spare double, and a study . Never had a worry about space . Bloody cold though in half the rooms because they weren’t used much except at Christmas for example .
The beds weren’t laundered that often because they just weren’t used enough . And I’m not sure how they cleaned it all . Suspect someone else did that .
The house was sold again in 2012 or so - still advertised then for small families .
The only downside is that with the space they amassed a lot of stuff . A colossal amount of very expensive crap . And I’ve no idea if you can still do what they did ie divide and sell half .
But if you could, and I had the money and that I’d do it ...