Mr. Humbard's program was internationally broadcast and his ministry became a big business (helped in part by loans from Teamsters union President Jimmy Hoffa--see the article mentioned below), but in 1973 Mr. Humbard ran into problems with the U.S. Securities and Exchange Commission because bonds and promissory notes that he had sold since 1959 were sold by his own salesmen, and were not registered with the SEC or sold through licensed brokers. A planned revolving restaurant was never built, and a transmission tower was eventually sold to a local businessman.
Mr. Humbard eventually retired to Florida, and his son Rex, Jr. took over the ministry. What remained of the Cathedral of Tomorrow was sold to notorious fraud and fellow Akronite Ernest Angley in 1994.
For an excellent examination of Rex Humbard, his history and scandals, click on the link for the article Jesus for Sale by Denise Grollmus in Cleveland Scene, October 31, 2007.