Clearly something will need to be completed in the entire house but is there a special way this gets treated for smoke that is different from usual sealing?

@Josiah McGinnisThat would be incredibly foolish to permit that unless maybe If the guy was a plumber and you have known him for many years .If that toilet is not sealed it will cause a leak and could rot out the subfloor or worse-flood the house .

This is my first time painting so I'm not sure how well 1 coat of Kilz will seal the smell or wood paneling color. 

They will also include other terms like sealing the records so the eviction does not show up on their records.

BAD DECISION - water runs downhill so my seal-coated and still leaking roof is destroying my ceiling and my 2 1/2 year old rehab. 

That's because anything over 4 units will require you to follow the IBC (International Building Code) and require an Architects seal.

Wax seal is oozing.

@Matt Williams Exposed brick is a hot selling feature right now in older properties...get the fireplace cleaned up, seal it, and showcase it...I'd only consider eliminating it if there is a structural issue......where is your property located?

There was also a bat infestation, if you have bat guano you better plug up the holes so the bats can't get back in, and plumbing, plumbing, and more more plumbing ... 4 out of seven toilets had bad seals.

We have a few larger appliance vendors but they are expensive for minor appliance issues like seals, handles, and timers.