The cathedral will be the new home to St. Callistus' flock, as well as administrative offices of the diocese, if the plans go through. A source told FoxNews.com the cathedral's move to St. Callistus is the only option on the table.

Crystal Cathedral Ministries filed for Chapter 11 bankruptcy protection in 2010 and, last July, Schuller stepped down from the board. In recent months, several of his children have left the church, including daughter and senior pastor Sheila Schuller Coleman. The only family member left on the Crystal Cathedral staff is Bobby Schuller, a volunteer pastor.

One of the reported reasons for Schuller's departure was his daughter's insistence on making choir members sign an agreement stating that marriage is between a man and a woman. Schuller wanted all to be welcome in the church, which was designed by openly gay architect Phillip Johnson.

St. Callistus Church, with pew space for 1,200 congregants, has less than half the seating capacity of the Crystal Cathedral.