I should mention, that if you want to use the building you can, but I can't take credit for much of what is in there, other than the walls. The stairs that are in there aren't mine either but I've since made an overlay that produces something similar:
Click image for larger version. 

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along with an underlay you can use if you need the stairs to be different than the background:Click image for larger version. 

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Comments welcome too, or if you need something altered to suit your purposes, do let me know.
cheers,
Meshon