For example: there can be no plastic pipe in plumbing, the walls between units must meet certain specifics to be a firewall, if it is forced air each unit will need its own furnace as units cannot share a return air duct, etc.  

Slightly more valuable properties I prefer to rent for less and save the expensive updates for just before selling because that price range buyer is more sensitive to what is in style...beige granite now dated in favor of grayer quartz whereas low end is thrilled with any solid surface over plastic laminate.

If dirt--you'll need to install vapor barrier (heavy plastic) and gravel over that, then possibly some type of flooring.Is it a stone/rubble foundation? 

Is a highly skilled ice sculptor going to use a children's plastic pumpkin carving tool?

They travel with all their belongings in a big plastic storage container. 

I wish they had used a plastic wall to contain the dust. 

The inspector said the table that burned was like a “fake plastic”, and likely released what could be unsafe carcinogens into the air (although he did not actually test the air quality for certainty).

Copper wire conductors in NM sheathed cable or in rigid metal or PVC plastic conduit has been the norm since the mid-1970s, and there are currently no new innovations in the wiring materials themselves.Most houses I have issues are from the 1950s old rag wire with no ground the cloth is brittle from heating of the current over the years.Lots of flippers will cobble together a house, install new wire where they are forced too leave old rag wire to rot away.

It'll look like the glorified vinyl linoleum flooring it is, but hey, that's the price you pay for hands-off real estate investing, and lots of people like plastic everything in their lives.Ripping out a whole subfloor because of cat pee, as @Micah Mcarthur suggests, seems a bit much.

Most often those plastic valves becomes brittle over time and very well might break when trying to remove.