Did you every find a 3rd party service or just continue to build your own?    

when you "hearing" stuffs, you have to investigate deep dive and ask for pragmatical answer, including pro and cons.

That rent just isn't sustainable and tenant could be unable to continue to pay...or could look elsewhere due to it being above market.

Now, I think the best exit strategy to avoid recapture tax continue to build on your portfolio would be to do a 1031 exchange. 

In fact, given the start up costs, the best way to make a profit as an MTR is to earn the continuing support of the property owner served.  

The first monthly interest installment of xxxxx due on or before April 15, 2024 and continuing in like consecutive monthly interest installments of this amount for a total of one (1) year or twelve (12) payments at which time the entire unpaid balance, including Principal, accrued but unpaid interest, will become due and payable.

She and my stepdad would continue to live in the house and pay for everything (e.g., utilities, mortgage, etc.).

Your definition is correct for "legal non-conforming".The "legal" part of "non-conforming" is dropped when it doesn't apply so most commonly people call these units "non-conforming", "finished", "in-law suite/unit", or "bonus unit".Non-conforming: Any property that doesn't meet current zoning requirements.Legal non-conforming: A non-conforming property that was lawfully established under previous zoning regulations and is allowed to continue its use.Based on his posts @Mario Morales is referring to a non-conforming unit.

Seems to be a great hold that'll continue to increase in value and the debt will be getting paid down.

LOTS to talk about in Calgary as quality multi-family deals are being snapped up quickly, multiple offers on handyman specials, and parts of the city is experiencing Sellers Market, while the CIty of Calgary has decided to continue their major capital reinvestment projects, so there will be emerging areas soon!