Some major mall landlords are scaling back their presence at New York City’s big retail expo next month, another indicator of challenges facing the sector. Simon Property Group, the country’s largest mall-centric real estate investment trust, will not exhibit at this year’s International Council of Shopping Centers’ deal-making summit at the Jacob K. Javits Convention Center, a spokesperson for ICSC confirmed to The Real Deal. And Taubman Centers, which is the fourth-largest mall REIT by …