Gov. Chris Christie and Lt. Gov. Kim Guadagno were on hand Wednesday to help Realogy Corp. officials break ground at the company’s new corporate headquarters in Madison, a move that retains 950 jobs in New Jersey. “Realogy is a world-class company that could have moved its headquarters elsewhere, and taken its 950 employees with it,” Christie said in a release. But the company’s Realogy’s decision to stay in the state — it will relocate from Parsippany — “sends another strong message that the New Jersey comeback has begun,” the governor said. In exchange for retaining the jobs, Realogy — which owns Century 21, Coldwell Banker and other real estate franchise firms — was approved for more than $12 million in incentives from the Economic Development Authority, including a $10.7 million Business Retention and Relocation Assistance Grant and a $1.4 million sales tax exemption. Realogy signed a 17-year lease at the 15-acre site, and the environmentally friendly 250,000-square-foot facility will have green-roof technology, the company said in its announcement.