I am open to other scenarios.We have access to $200k ish in equity in our primary.We will soon have access to another $100-150k for retirement/investing/IBC/etc.I would like to move into my young family into a (new build or fully renovated side by side) duplex.

They are usually run by picky retired people who love to stick their nose into your business (a generalization... but often fitting!).  

We have a new Mayoral election coming up this fall (incumbent is finally retiring - yippee!) 

I was looking to Rent to Retirement and another similar company. 

My W2 has a good retirement and I don't plan to try to leave it.

My wife and I are working professionals and this is my early retirement gambit, so we are pretty serious.   

We bought 37 doors between 2018 and 2021 as our retirement plan.  

A couple ones that I came across are Rent To Retirement which you'll find a lot of reviews about with these BP forums.

Main owner operator is ready to retire.

I'm going with 2 sentences...Tax benefits are secondary to the value of the investment...The large percentage of wealth held in retirement accounts is particularly notable given the tax advantages these vehicles offer.