Untitled Towering Inferno sequel

Note: Please, do not add "Irwin Allen died in 1991" or "Paul Newman died in 2008", because this was before the stars and director died.

There were plans for a sequel to the 1974 film The Towering Inferno. It would have Paul Newman and Steve McQueen return for their roles respectively. The film did not have an official title.

Plot
The plot is currently unknown.

Why It Was Cancelled

 * 1) Steve McQueen refused to star in the sequel and died later that year.
 * 2) Irwin Allen decided to work on When Time Ran Out....
 * 3) Paul Newman decided to star in When Time Ran Out... after the film was cancelled.

Results

 * The Towering Inferno 2 was permanently cancelled.
 * The Towering Inferno is a standalone film.