Ol' Homer did some research here on IDT and moving out of Hackensack. The real reason was that Hackensack did not have the fiber optic capacity that they needed for their operation. To obtain this capacity, "somebody" would have had to bring high speed fiber optic service from Rochelle Park into Hackensack. Whether it was AT&T , Verizon or whoever had the operation on Passaic Street in Rochelle Park, they had no plans at that time to provide this type of service.
Apparantly fiber optic was available in Newark at a building which was available at reduced price and was much more suited to their needs.
Their move had nothing to do with the Court Plaza elevators. Although nobody has brought it up yet, the move had nothing to do with the Health Department stopping Howard Jonas's kid from hawking hotdogs next to the Main Street building.