https://www.metv.com/stories/heres-raymond-burrs-fallout-shelter-plan

Della Street was not a part of the picture!

Raymond Burr felt that the Perry Mason book series couldn't be properly adapted into a television series (https://www.metv.com/stories/raymond-burr-felt-that-the-perry-mason-book-series-couldnt-be-properly-adapted-into-a-television-series)

"You couldn't and we didn't do one of Erle Stanley Gardner's great stories in one hour," said Burr.

Later in his career, Raymond Burr vowed he'd never act in another weekly television series (https://www.metv.com/stories/later-in-his-career-raymond-burr-vowed-hed-never-act-in-another-weekly-television-series)

Playing Perry Mason had made Burr a star, but it also wore him down.