I bought in marketplace a bundle that contains a little town made of few buildings, no interiors , apart from a demo scenes it has a lot of static meshes that are walls but they are actually not real walls they are used to create good looking buildings but empty inside, i thought at the beginning to create my interiors and use as external walls these provided by the bundle but i suspect they cant be used because they are not walls but plain poligons with a texture on them
This is very common. It will usually say ‘with interiors!’ if the buildings have insides.
One trick you can try, is making the material two sided ( just a checkbox ) in the material instance ( or main material ).
Other than that, yes, you have to make the insides from the outsides. It can be a real pain 
thanks, so yes i am not sure why they sell these assets, using a building only for the exteriors is not that useful
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