> The loans could go to private or nonprofit developers, or to governmental groups like the King County Housing Authority. As the loans are repaid, Mr. Smith said, Microsoft plans to lend the money out again to support additional projects.
https://www.seattletimes.com/seattle-news/homeless/microsoft...
The key is zoning and it sounds like they have some local buy-in from politicians (see the attached statement of mayors in that article). I'm skeptical that happens, NIMBYs have a way of stalling up zoning, but it's a still a step in the right direction.
A sub-prime mortgage is made at market rate--at an unaffordably high rate as a result of the risk. These are below-market rate loans -- loans at affordable rates for the borrower in spite of the risk. The in-spite part is what makes this philanthropic.