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From The Vault - Fallout Wiki
The ruined store is a location located in the Sierra Madres' Puesta del Sol south.
The ruined store is a safe haven from The Cloud. There are two floors to the ruined store the upper level has exits to both Puesta del Sol North and Puesta del Sol South. In the lower store area there is a door with a very hard lock.
- There is a queen sized bed. Do not sleep in it if you're playing in Hardcore mode, it will start the calculation of your sleep requirement.
- There is a journal on a bookshelf that you can see when you enter.
The ruined store appears in the Fallout: New Vegas add-on, Dead Money.