If I was extremely rich to the point that I had more than I needed to survive until my death, I’d be helping Jewish families buy homes. Basically like a very cheap mortgage. A trust would own the home until they are paid off. Right now mortgages are insane, you end up paying more than double the value of the home. That makes no sense.

Ashrecha! What a beautiful thought! But I disagree with your last two sentences. You are ignoring 1. time value of money 2. historical interest rates

Maybe it's different in America, but here in Israel many people can afford the mortgage payments - but can't get together the down payment they need, so they just keep renting. To buy a decent-sized apartment in my area I'd need roughly $270k as the down payment. Lending part of that to Jewish families, who would then pay that off together with their mortgage payment, would be a huge chessed.

Affordable developments near Jewish infrastructure would also be a huge benefit, something that has happened to a degree but it’s obviously not easy to pull off

giving everyone cheap mortgage rates will probably just drive up prices....