As tight as the affordable rental housing market is, it’ll worsen. The Republican tax plan lowers the corporate tax rate from 35% to 21% and lowers taxes on pass-throughs. These changes will reduce the value of tax credits used to build low income-housing, thus reducing the number of affordable units built by 15% or 14,000 units/year. Other changes make renting relatively more attractive, increasing demand. That will boost market rents.