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 journal (with the appearance a ruined book) next to the TV on a bookshelf that you can see when you enter.
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.