Mira Costa High School principal Ben Dale will retire after 11 years helming the campus, he said in an announcement that surprised the Manhattan Beach education community Tuesday morning, March 16. Dale, who announced his retirement in one of his periodic newsletters, will leave at the end of the academic year, on June 17. The Manhattan Beach Unified School District has not yet announced a timeline for replacing Dale, but Superintendent Mike Matthews said Tuesday that the district has strong internal candidates and will look outside the MBUSD as well. Dale is retiring from the school, he said in a Tuesday phone interview, because itâs time.