The previous owner ripped down all the old Lath & Plaster in the lower unit and slapped on drywall without insulating the walls (according to the neighbor) which hasn't helped the heating situation.

They owned their own home free and clear, but because they were living hand to mouth they let their insurance lapse, and since there was no mortgage company to force insurance coverage, they had continued no insurance for a period of time.The fire started not in their home but in their neighbors house and quickly spread to their home which was very close to the neighbors house.

There are some renovated homes across the street and on neighboring properties.

Not only that, I heard the neighbor said " they are using my home to take care of other elderly without my knowledge ".

Neighbors last resort -> Skip trace

I need to order a drill - none to rent and well, it's another tool to own.I thought of not drilling b/c my neighbor across the street is a GC and does high end work.

Its really easy to track things like that becuase my neighbor hood is full of the same duplexes.

I don't think your lease says he cannot have visitors set outside and see for yourself don't take your neighbors word for it, they might have an axe to grind with the subject.Joe Gore

Welcome to BiggerPockets, Kenneth, from a neighbor.

I would be careful not to specifically say "curry" - perhaps using "strong cooking odors, such as fish, spices, incense, perfumes, and other smells that may linger and bother neighbors."