It's quite easy to make your own - my Basic Backdrop Box with a concrete or brick texture applied would look fine when dressed up with some suitable props from the others' posts. I used to do this quite often, you don't need a fully modelled interior, just the suggestion of one. I have several saved scenes, but they probably include other people's geometries or I'd post some.

Quote - When do you need it? I have a warehouse interior. I was going to put up as a freebie since I can't really work.

I'd be interested to see that, too. I hope that whatever is preventing you working is soon overcome.