Considered getting meth operation back up and going? Probably more profitable!
I've done a couple of these. 50k might be a good price but really depends on what you will have to do to get the place clean. You may end up having to tear the thing down to the studs and rebuild 80% of the place. Tearing down hazmat is different than a regular demo job so depending on the county you may have some extra costs on that side as well.
Testing, clean up, and certifying costs can get really pricey really quick if you're going to do it the right way - but even after you've got it passed off by the health department, you will still have to disclose the history to renters of buyers. Also the property will likely remain on the contaminated list for a very long time, if not forever.
Might be a great deal, might be a total loser - either way do you research before you jump into a meth house project.