When I hired this type of work out, I put together a full job description as if I were hiring a photographer/videographer.

Hello Twee, I hope it does work out for you.

When my daughter looked into tankless, they told her they could install it outside (couldn’t work out venting inside) but it would require additional maintenance, so they just went traditional.

The math may not work out.2.

I think it's ironic that Fannie Mae was bailed out by the federal government because of its incompetent underwriting yet you assume this one will work out. 

Along with the holders of mortgages much more willing to do long term workouts instead of just foreclosing. 

So much sloppy work out there these days for way too much money. 

I bought 3 last year and sold 1 that didn't work out when I went to refi. 

So your decision is: do I borrow the money at 6% (subsidized by the tax deduction, which work out to be more like 4.5~5%) to make that investment or do I pass?  

It's probably best to take a step back and see if there's something more manageable and profitable rather than keep trying to work out this puzzle.