There is old company information stored somewhere in my profile -- that I can't find and change.

I would encourage you to be as transparent with the seller as possible as your goal should be to help them out of a situation albeit tax delinquency, code violations, divorce, foreclosure etc... 

It means you're looking at exit strategy and risk mitigation both, which kind of go hand-in-hand anyway for this situation.

The trick in the city is to make your own situations.

I've thought about writing the letter specifically about the back-tax situation, but my intuition is this will probably trigger negative emotion.

Land contract for 2 properties (2 single families) & a combo deal for 2 properties (duplex & downtowm building—store front & loft).

I have an extra room in my primary residence and I decided the best way to start and learn would be to rent that out.I guess I am just looking for general advice as to what I should do in this situation and what I should be looking out for especially when it comes to screening. 

(Government qualifications requirement)Unfortunately it took away 20% of Canadians buying power and hopes of ownership  which is kind of bitter / sweet situation. 

But we came across a sort of complicated situation.

without listening to any of the details of your situation.