Matt, honestly speaking, I have never heard of a bank calling a loan due unless the borrower did something to trigger it, ie default on a payment etc so that was never really a concern for me. 

Pull the trigger on one and you'll gradually be less nervous.

Then the distressed inventory dried up, and similar houses started selling for $60k+.

I've been using Frank Maxfield for several years now.I've seen him bring rental carpet back from the dead and make my personal home carpet sparkle.He uses a semi-dry approach with a buffer.  

Nothing against "flippers", but that's pure speculation for the average "Joe" to think they'll buy at one price and make $20k or so on a quick sale, alls fine and dandy till the music stops playing and your stuck with that "investment" sucking your bank account dry with holding costs.

The large general real estate book is dry and long, but the summary books were the ones I studied from and passed.  

@Michael ChowWe have 4 rentals purchased under our names in Ontario and have been advised that transferring ownership to a corporation will be considered a sale and will trigger land transfer tax, which for us is a $12k hit right away.  

That or since no one has built in the past 5 years, the Condo litigation tap will dry up, as will the lobbying money.

Hope this helps and hope to start building relationships for when I'm ready to pull the trigger.

Learn...and most importantly don't be afraid to pull the trigger!.