A prominent house of worship in Southern California has been flipped — from a towering glass megachurch of a flamboyant televangelist to the new seat of the seventh-largest Roman Catholic Church diocese in the United States.

The landmark , originally named the Crystal Cathedral, hosted its first Mass on Wednesday following a $77 million renovation by the Diocese of Orange .

It had served for many years as the backdrop of the “Hour of Power,” which was once the most popular religious television program in the nation. The show’s star was the Rev. Robert H. Schuller, who started his evangelical empire at a converted drive-in movie theater and referred to the 78,000-square-foot cathedral as a “shopping center for God.” His ministry later went bankrupt.