Conversation so far:
when was the first season of the series 24 filmed
Production for the first season of the series 24 began in July 2001
when did season 1 of the series 24 air
The premiere of the television series, 24, was planned for October 30, but because of the September 11 attacks, delayed until November 6
where was season 1 of the series 24 filmed
The series 24 was supposed to be filmed in Toronto, but due to the variability of Canadian weather, Los Angeles was chosen as a filming location

Question: where was the initial set
Self-contained rewrite: where was the initial set of ctu for the television series 24