Instead of just lending people money to buy homes, companies are now co-investing with them — in other words, taking an ownership stake in the home. This can take on many different forms, including offering down payment assistance or providing a substitute for home equity loans. The underlying principle is the same: A home buyer or existing homeowner receives cash in exchange for a share of the ownership of the home. The co-investor then (1) shares in the home’s rising or falling value (often disproportionately to their ownership), and (2) sometimes requires a flow of monthly payments from the occupant.

https://www.nytimes.com/2020/04/20/upshot/housing-option-coronavirus-pandemic.html