Where does the climax of the play "A Streetcar named Desire" occur?

To add to what the previous respondent has stated, this
scene is clearly the climax of the play, but Blanche's sanity has been in question long
before this. This is the final straw that finalizes her break from reality that began
when her husband killed himself. His suicide was a reaction to Blanche's discovery of
his homosexuality, but it also led Blanche on a path of self-doubt. She feels that the
only way she can give herself worth is to be attractive to men, and she leads them on in
order to bask in the glow of their affections. This does not work with Stanley. He sees
through her and takes what he wants to take from her, leaving her shattered when the
only illusion that she had to keep her going, her beauty and desirability, is thrust in
her face.