But as our two kids age it’s also possible that our ability/inclination to save diminishes.

Based on commonsensical inclination I would think this is conservative and appropriate.But absolutely I agree the sponsor is the one putting the deal together, and therefore the most important piece of the puzzle. 

I'm a complete numbers guy, and don't find myself inclined by appearances or location, which really leaves me blowing in the wind.

If he wants double his quote I might not be so inclined to give in.

This means that you've got an issue where they own a chunk of the property AND they can basically 'pay themselves' - there's no amount of equity that you can offer that will offset the ability to make money in the present if they are inclined this way... 

I'm feeling inclined to sell the SFR and keep the multi.

I assume the waste eventually flows into the septic so I would be inclined to install a backflow valve. 

I would not be inclined to let it go.Tell us how it turns out please.

I'd be inclined to investigate the above rather than the cash out refinance on that home. 

Absolutely there are extraordinary opportunities here.What you're not going to find is a calculator or a guru in California that's going to be able to tell you what it'll cost to fix a seamed copper box gutter three stories up on a 20-degree inclined hill, what to do about hundred-year-old brick falling off the building at the roofline on the northeastern corner of the property, the incomprehensible reasons the contractor from McCandless refuses to talk to the contractor from Dravosburg, and why exactly the same house built according to the same plans is going to sell for at least fifty thousand more if it's behind the cemetery in Munhall than if it's in front of it.