A proposal to bring affordable housing to teachers in the Miami-Dade school system is explained. Teachers can’t afford Miami rents. The county has a plan: Let them live at school.Miami-Dade’s school system and housing department have a plan to build low-rent apartments at Phillis Wheatley Elementary and at an expansion school at Southside Elementary in Miami. The rents would be targeted at teachers caught in a pricey real estate market.