Who are the two people you knew? The picture is of my class (I'm there), and I went through elementary school with most of those people.
Juan Crespi Home School was on the corner of 24th Avenue and Quintara Street, just across from Lincoln High School (on the east) and the Sunset Reservoir (on the north). The building is still there, though used for other purposes. It provided classrooms for Lincoln HS longer than it was an elementary school!