As for gentrification that is a natural process that is a benefit not a negative.If you want to create affordable housing join or contribute to a charity organization don't start a business.

You are possibly leveraged too high to make this deal with lender. they may be skeptical, because you may not have enough skin in the game(YOUR MONEY) some one financing the down payment is normally a no from a lender on investment property

The notion that low rates will prevail long term seems based on the view that market forces can be overcome by Fed policy alone, which they can't, at least not naturally. 

Make the payment similar to his rent so you know he can survive and pay on time .I’d rather have the guy give some money down so he has skin in the game . 

Then they have to sit there until it's done, to make sure nobody throws their underwear out on the floor, listening to everybody else's kids running around screaming (Our kids are very well-behaved, naturally).

Then within 15-20 years they sell the property hopefully giving significant returns, though obviously being so far down the road this is somewhat speculative.I guess my question is twofold: These numbers sound too good to be true, especially given the tax free nature of the returns.

I’m not sure what the rules are on this website, so I don’t want to overstep my bounds, but you can find the YouTube video with some more info by searching “Cambutal 308 acres”As far as utilities go, the property has a natural water source and city power is less than a km away. 

But if you have thick skin and can deal with some BS, there’s money to be made there. 

Many people take a common route of naturally starting out with either SFH or residential MFH and then gradually moving into larger properties.

Only mother nature knows if the supposed "100-year flood"will happen in any given year (here's a video) that is by an engineer really fascinating for us Nerds.