But my tenants are pipefitters (they can change a hot water tank), boilermakers (can change a hot water tank with their eyes closed), electricians (can replace a fuse box with a breaker box), electrical crews (can wire a 2 story house for cable tv), scaffold builders (can trim a tree with a pole saw), welders (can replace the factory exhaust with a custom stainless steel exhaust on a riding mower), construction foreman (can add a bathroom counter and vanity).

Asbestos positive materials I've run in to -* Caulk around windows and doors* HVAC duct work tape* HVAC exhaust pipes* Resilient flooring glue* Resilient flooring* Mortar in fireplaces* Lining on underside of sinks* Plaster* Drywall* Drywall mud* Siding* InsulationGoogle "Asbestos in construction materials" and the results are staggering.

Insufficient fresh air to support combustion can lead to "back drafting" (air for combustion is sucked in via the chimney and exhaust vents, thus pulling exhaust gases back in as well).

One of the reasons for going high efficiency is that you can direct vent the exhaust through PVC piping through the wall rather than having to vent through a chimney and over the roof.Chimneys need liners, they can leak exhaust (carbon monoxide) into the living space, they typically are brick structures rising above the roof line (oh and they usually seem ready to drop bricks due to lack of maintenance) ...

Exhaust that list.

The floor was literally and completely black with exhaust soot ground in.

@Bill Coleman If they are to grow in the basement, then you will need to work with them to construct a purpose built room - preferably one with a vapour barrier between it and the rest of the house and with its own air intake and exhaust.  

Could you add some vents and then a radon fan to then exhaust the space?

The problem with the "box" is how does it exhaust the humidity, aka how does it actually dry clothes?

Maybe for the sheetrock materials from home depot, but not the insulation, new exhaust fan and associated labor that will need to be replaced in the attic directly above the area where the ceiling collapsed.