We replaced the floors, updated the kitchen, replace plastic bathtubs with tile and frameless glass doors in all the bathrooms, and closed the screened porch to add a master bedroom W/M bathroom and closet.Added a dwelling under the new master bedroom kitchen and new deckThe townhouse had an original 1323 sqft with the addition came to a total of 2000 sqft.

A family member bought a condo and the pipes needed to be replaced because the plastic originally used was prone to breaking. 

That looks like a plastic bumper over a metal frame.

When I was about to leave, a neighbor told me to check plumbing before closing because she was told by the deceased person who lived there that it clogged and he defecated and through it out on a plastic bag on the trash.

If remediation is required, I would need to hire a special team to seal off mold areas of the units with plastic and execute the removal. 

I have seen plastic drapes an mini blinds to help keep water off the sill for privacy.  

If the wiring is sheathed in vinyl/plastic, I wouldn't sweat it.

I cleaned it out and discovered that there was broken glass(looked like shards from a wine glass) as well as the plastic stickers that they put on new plates in the filter.

Sometimes if you search for Plastic Signs [Your City] or Corrugated Signs or Coroplast sp?

I went to a plastic distributor and fabricator and got a TON of the pieces of plastic cut down to a standard size 18x24 and they carried the H-frames on the cheap.