Owners, acting in their own individual capacity, are allowed to clean, given this, how can I add additional owners w limited rights?

Additionally, the 1 place is paid off so I didn't have any real urgency.  

I spoke to 3 lenders today and all insist on me using my own name and transferring after closing which is yet additional fees.

Which is close to round enough, in turn, that it makes me think the lender just documented $10m/yr and stopped documenting additional income at that point because it would serve no purpose. 

I would also add, it's possible you could end up repainting with Kilz which will "seal in" the cause of the smell functionally eliminating it. 

Literally everything to learn about real estate, deal-wise, all comes down to simple addition, subtraction, multiplication, and division.

A lot of people give up at that stage but if you track down the owners, you may be the first person to approach them because it takes additional work.

buying performing notes

I've seen folks purchase properties, that have tenants signed on for a year or so, but their immediate expectation was to evict/break a signed lease of one unit, so they could live in one, while the other offsets and provides the additional cash flow one would expect.

I have seen many terms used when referring to performing/sub-performing and non-performing notes such as "Asset type", "Note Type".