Personally, I would start simple with a single family. 

If you have ever learned something important by trial and error, then you can probably understand the frustration that you feel when you make a "rookie mistake" or a simple error that creates a big negative result.

And remember the REI Simple Program that you signed up for but didn’t use?

What I'm really looking for is a simple platform where my tenant can pay rent online rather than send in a physical check every month (their current system...).

Speaking from hands on experience on both platforms as I've worked with both Carrot and Wordpress sites (more than 400 sites so far since 2017), what carrot brings into the table is their simple, all in one, fast website platform.

Very simple as Chris notes its just an up front agreement..

The truth is that if you find the right deal, you can make pretty much any market work but if you are looking for consistent deal success that narrows your options down.Some investors look for simple signs like the "Chick-Fil-A" test.

These are not simple challenges to overcome. 

Our HOA is considering buying the lease so that the entire condo will become fee simple.

Using simple numbers, assume I want to purchase a $100,000 property using crypto as collateral:- I pay the closing costs with cash- I put down 10% down payment with cash ($10,000) - I utilize a crypto mortgage for the remaining 90% ($90,000) This way, I still keep my crypto and I have a property, both of which may accrue in value over the long-term.