When the Claretians withdrew from the school, San Gabriel Mission High School became solely an all-girls’ school in the fall of 1971. It has maintained its full accreditation through the Western Association of Schools and Colleges since 1954. In recent years, San Gabriel Mission High School has continued to grow. In the Fall of 1994, the new chemistry lab was finished and in the Fall of 1996, the new Physical Science Lab was opened. In 1997 a chapel was completed. In the Fall of 1999, a state of the art biology lab was completed. Also, 2007 saw the birth of the exercise room, which is currently under renovation. In addition, in 2008 a new floor was added to the auditorium; and, in 2009 a new dance studio was completed.