Dimensional Manor

Create a manor of the shape you want, the manor cannot be larger than a 60 foot cube per caster modifier+caster level.
It can contain any room you want with all the necessary supplies for those rooms, if the unseen servant spell is known the manor also contains a number of servants equal to (spellcasting modifier+caster level*3).
Once the manor is created with the first casting of the spell it is necessary to re-cast the spell to modify it, otherwise the manor can be accessed via the key as a bonus action at any time.