Agree with everything above about ambiguous language and the "should-haves". 

Quote from @V.G Jason: I'd partner with a lawyer that can help put some contractual language on the downside of working with contractors and real estate agents.I'd also partner with a RE brokerage firm that clearly understands your goals. 

More importantly, this is my first time utilizing this strategy; in a country, culture, laws and language that is foreign to me, so if any professionals see a glaring problem with my numbers or legal or otherwise, my ears are always open to wisdom.

You may have a point there, I never believed COVID came from a Chinese bat or that taking an experimental vaccine was a particularly good idea either.

@Eric JonesPerhaps a poor choice of words ... it's a consequence of being illiterate in two languages ;-)Through changing (hopefully lowering) the principal balance several times over the course of a period, you are changing the amount of interest accrued (or balance of interest owned/due if you prefer).We are on the same page here ... just some language differences.

I think it's really important to include the language in the lease.  

Not to get too into the weeds, when you are face to face with someone, you can watch for mannerisms and non-verbal body language. 

This reduction in access is what the compensation was to be for and tenant complaints will be many and with creative language. 

If you have a handshake/wink-wink kind of deal then you should get a Promissory note at least that outlines the terms of the loan and what happens if it default, who the loan is between, and usually in agreements like this the language is broad. 

His name is Joey Chinese.