His master bedroom
Her master bedroom
His den
Her den
Living room
Kitchen
Exercise room
His hobby room
Her hobby room
Media room
Bunch of bathrooms
Workshop/tool room
Laundry/storage room
Cloakroom/mudroom, side door
Cloakroom/mudroom, front area
Hidden panic room/vault
Lots of walk-in closets
Smaller not the way to go, necessarily.
You’re right. Besides, it will be the maid that cleans all those rooms.