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Originally opened in 1935, the historic Griffith Observatory underwent a signification renovation and expansion in 2006, and is now one of the world's major planetaria. The new underground facility houses temporary and permanent exhibition areas along with offices, a gift shop, and classrooms. The popular hall of science was refurbished and expanded with new interactive exhibits. The New West terrace features a glass meridian wall providing a spectacular display of the constellations when sunlight strikes the meridian line each day. Of particular significance is the new 202-seat Leonard Nimoy event horizon theater/lecture hall and the new 306-seat multi-media planetarium theater.

MCH provided full scope acoustical and audiovisual design to make the Griffith a state-of-the-art Observatory for the 21st century.