Creates incentives for lenders to renegotiate loans for borrowers who have negative equity but who have the ability to pay a lower mortgage that reflects the actual value of the house. This act allows a lender to receive up to fifty percent of the future appreciation of a home when the lender is willing to renegotiate a home loan mortgage for the current value of a home. The future appreciation will be determined when the home is sold and will be the difference between the actual sale price and the amount owed on the modified loan minus down payment and closing costs. This act sets up procedural requirements for the loan modification. The shared appreciation loan is not subject to an excise tax when the borrower is the same on the original loan and the modified loan.   Official Text and Analysis.