Do not rely on it for legal advice.

I could only imagine the legal agremeents needed on who has what right/easements etc.

We use carbon copy in letter size (legal size is just a pain).

Hi, I have converted 12 sfh to legal duplexes in oshawa.

I don't know your state but I suspect you would be breaking some law, as you are likely unable to legally market something you don't own or have use and possession rights.

I think I would probably talk to an attorney tbh these business purpose non regulated loans do not have rate locks that have to be honored legally.. they can and do change them unilaterally.. borrower accepts counters or declines and loan fails. 

Security deposit amountYou can find plenty of examples by searching for "tenant estoppel certificate doc" or exchanging "doc" with "pdf" for more options.Here is an example and explanation: Sample EstoppelSome have a lot of legal jargon but this document does not need to be so detailed.

Also, if the triple is a legal multifamily, you will be able to use the other 2 vacant units at gross rent of 75% to lower your monthly mtg payment.

However if it’s a really big hazard and they fail to take care of it quickly, I might just take care of it myself rather than taking any legal action, personally.

Although the forum input can be helpful, you need to have proper legal precautions in place rather than opinion.