It serves grades 9 through 12 and is a part of the Los Angeles Unified School District.The school's original campus was located in downtown Los Angeles on South Beaudry Avenue, the present location of the Los Angeles Unified School District (LAUSD) Board of Education headquarters.In February 1957, Polytechnic moved to its present site in the San Fernando Valley and opened its doors to new students for the then fast growing suburb.It was in the Los Angeles City High School District until 1961, when it merged into LAUSD.The 2009 opening of Sun Valley High School additionally relieved overcrowding.