NEW YORK: On a recent weeknight, three tenants of an aging Bronx building were trading apartment horror stories inside a packed ballroom lined with city bureaucrats.The occasion was the third in a series of “rental rip-off hearings,” a new forum launched by New York Mayor Zohran Mamdani for disgruntled renters to air their complaints directly to housing officials — and in some cases, the mayor himself.As she waited in line, Gulhayo Yuldosheva said she worried that noxious mold in her apartment had worsened her child’s asthma.