I like your 'gray area' idea. 

Is this a terrible idea?

I did some research and this doesn't seem like a bad idea, but I'm just a little skeptical and nervous. 

Thoughts and ideas greatly appreciated.Vic

Seems like a good idea to pay if off and have that cash flow, but on other hand,  seems like more doors would be best for an overall portfolio.       

The idea is not magic, it basically involves paying extra on mtg, by using your heloc, then paying the heloc down, then keep doing it.The bottom line is you are paying your mtg off substantially early because you are paying Extra money out of your pocket toward your mtg.  

I had no idea until now this loan had PMI on it - is it even legal for them to do this when you put 20% down??

I like the idea of maintaining a copy of the lease online for reference purposes.

I like this idea, but their quote was over $15k. 

2nd floor apartment of a 100 year old house, someone decided it was a good idea to pour concrete between all the floor joists, thereby rotting them out.