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Size - multiple stories or extremely high ceilings, media room with large screen Defense - insane alarm systems, panic room, escape tunnel, moat, gate, intercom, cameras, etc Frivolity - excessive bathrooms, expensive banisters and door handles, rooms with imaginary "purpose"
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Number of rooms without any use seems important too / feel any good mansion needs to have rooms filled with useless trinkets
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The ability to host four or more conversations / poker games with four or more people each, without them interfering with each other.
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