My plan is to spend all of next winter talking to every lender I can about what they're willing to do for me. 

You will spend a lot of money on marketing to talk to great listing leads and do nothing with them if you only have one trick in your bag.

Assuming these are non-profit orgs that are not restricted to religious organizations or targeting protected-classes, is this actually legal?

I am in a very similar situation to you and really had to spend a lot of time researching to gain the confidence (Still working on it) on what I need to do.

You can easily spend a couple Grand just on permit fees at least in my state lol and not pulling any permits can lead to huge fines.

***************************************"Despite spending in Seattle and King County that has ballooned to $200 million a year, the number of people living in tents, on Seattle streets and in vehicles has grown 20 percent since 2016, to nearly 4,000 individuals.

I was hoping the community could provide some guidance on what the process typically entails when contributing capital and any steps they've taken to protect their investment.

She just learned old buildings, specifically your old building, might have lead, HUGE RED SIRENS flashed in her protective-mommy brain, and she backed out without a second's hesitation. 

Plus the 480K for rehab, I’m looking at spending about 1.3mill total on the property, with the ARV at approximately 1.7mill.

Spend time with your wife and recharge for the next day.