The neighbor had NDF come up and fix the pipes. 
Actually, NDF sent one of his flunkies to do the fix – the moron used the same broken pipe with some putty or Super Glue to put it back together.

I tested the drain, still leaking and the workmanship was really shoddy.  Now, as I’ve indicated earlier, I’m not a contractor or an expert in residential construction, but I am a Certified General Appraiser with almost 39 year’s experience and I can tell when an idiot has tried to fix something THE WRONG WAY!!!

I called the owner downstairs and sent him pictures of what the flunky did.
NDF come up and fixed the broken pipes himself.

HOWEVER, when he took the pipes apart, he found something that looked like putty or plaster used for
interior walls (like when you’re remodeling and have given your wife a blank check).
I kept a sample of the plaster/putty just in case, but NDF used his trusty wet/dry vac and cleaned out the pipes.

I asked him how that could have gotten there, he said apparently someone stuffed it down the drain from the sink.
Hmm, well I’m the only person that lives here and I don’t do putty or plaster work.
He didn’t say anything else…

See pictures to the right…