Here’s all we know about the Unified Grand Central Station and the latest target opening date (hopefully). Why has it taken so long for the Common Station to be built? Key timeline and developmentsPHOTO BY Department of Transportation Facebook PageHere’s a quick look back at the development timeline and progress updates on the common station. In April, additional delays pushed back the opening of the common station to the end of 2023. 2030: New projected timeline for the final, New projected timeline for the final, full completion of the Common Station (expected).