Half of renters in the United States have found themselves paying more than they can afford‚ following years of surging rents. But an increase in the construction of multiple-unit buildings has boosted the supply of apartments‚ which is slowly beginning to rein in runaway rents. Nationally‚ rents declined annually in December for the eighth straight month‚ according to Realtor.com’s monthly report. The median asking rent was $1‚713‚ which was down $4 from November and down $63 from the...