Quoted:
Do you think that they are "clean" ?
ie: free from environmental contaminents...
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I'd be worried about asbestos insulation with an unrestored silo. Hell, a restored silo might still have asbestos present simply because of the costs associated with removing the stuff. They are quite large. I know a couple people who went together and bought one in North Dakota. They built a similar set up with an airfield for access (it was 65 miles from the nearest highway on a dirt road) and fully rebuilt the interior, including the actual silo, which is nothing more than a really deep concrete pit with a giant, moving slab of concrete on top. It's really cool now, but it took them 6 years to complete it and nearly bankrupted a couple of the guys. The actual cost was pretty low (they bought it in the 80's and restored it in the 90s, but I think the cost was something on the order of $20,000 with almost 150 acres of surface land), but the restoration and upgrade to civilian livable conditions were enormously expensive. They did most of the work to build a "house" themselves, but the asbestos removal and repiping had to be done by licensed contractors, which cost a literal fortune (remember they are 65 miles from the nearest highway).
Total floor space, inlcuding several floors they added in the silo is something on the order of 150,000 square feet. Huge storage spaces, large, comfortable living quarters and hotel-like bedrooms. It's pretty cool, but I don't think it's really worth the money.