A store of your own, apart from the bank: it opens for you alone. Every storage chest you build opens the same store, and what is in it is safe when you die.
Open a nearby ground tile’s action menu and choose Build. The preview and server check the tile before placement.
Rearrange: open your furniture’s action menu, choose Move, select a nearby clear tile and confirm. Paint and rotation are retained, and the floor stays behind. No new materials are required.