This is an affordable housing program. I think it is called Year 16. From my understanding developers get a tax rebate to build affordable housing units in low/moderate income tracts, apartments or single family homes, and rent them to low/moderate income borrowers. After 15 years the developer can offer to sell the house to the tenant, but I don't think that is part of the rental agreement upfront. I am not sure if the developer is required to give the large Earned Equity credit, but this one is.
Thank you for your input. I kept going back and forth between seller credit, deposit, or adjustment.