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Urban Exploring in or near Riverside

I'm going back to Riverside from San Francisco and was wondering if anyone knew of any abandoned buildings or areas that not many people go to? I love exploring since there is an abundance of these locations around me and I like to see these places almost frozen in time. I've looked around Riverside and have only found graffiti waterfalls, the portal, and a bunker in Fontana. Does anyone know any other locations or at least clues on how to find them?

It's not toy Lionel

I was a member of the Inland Empire Model Railroad Club back in its heyday of 1980s. Every tie was hand cut, sanded, stained, and hand spiked. Scale model railroading was never Lionel. Several of the houses in the town were built by a friend of mine that passed away 25 years ago. He would take pictures of local houses and then build them from the picture. I was always amazed when someone recognized their house. He would open up his sketch book and there was a picture and address of their house. The gentleman I worked with was a WWII vet that loved to build models.