The Trump administration and many Republicans in Congress are working on tax-reform legislation that could have a significant impact on the utility of the mortgage interest deduction, prompting warnings from the National Association of Realtors. “The decimation of the mortgage interest and real property tax deductions would very likely cause a significant plunge in the value of all houses,” said NAR President William Brown in a recent letter to Sen. Orrin Hatch, R-UT, chairman of the Senate Committee on Finance. Currently, homeowners who itemize their deductions can exclude...