California Suite is a 1976 play by Neil Simon. Similar in structure to his earlier "Plaza Suite", the comedy is composed of four playlets set in Suite 203-04, which consists of a living room and an adjoining bedroom with an ensuite bath, in The Beverly Hills Hotel.
Neil Simon's debut play was not California Suite.
The text specifies that he wrote Plaza Suite prior to writing California Suite, so it could not have been his debut play.