The opening of the Silver Spring Transit Center, under construction since 2008, has been delayed yet again as Montgomery County officials study what is causing cracks in the structure.

The $112 million project originally was slated to open in summer 2011. Then it was postponed to November 2011, January 2012 and this summer. But the three-story facility, built to hold bus bays, a kiss and ride and a taxi stand and offer access to MARC, Metrorail and Purple Line trains, remains an empty concrete mass in downtown Silver Spring.