The theater was designed by David Rockwell of the Rockwell Group, with Theatre Projects Consultants, specifically with the Oscar ceremonies in mind. Though the stage is one of the largest in the United States—roughly tied with the Edward C. Elliott Hall of Music at Purdue University—measuring 113 ft (34 m) wide and 60 ft (18 m) deep, its seating capacity is only about half the Hall of Music's, accommodating 3,332 people.
The result of astute planning and technical design, the auditorium is particularly successful as a venue for televised theatrical performance (improving production values for American Idol and the Academy Awards). The architectural team consulted extensively with leading production personnel in Hollywood, achieving a highly functional cable infrastructure, with an underground cable bunker that crosses under the theater to truck locations on adjacent streets. Power is also substantial and accessible. The theater has a unique Rockwell-designed cockpit in the orchestra seating area for camera, sound, and stage management.
The hall from the front entrance to the grand stairway (leading up to the theater) is flanked by storefronts, as well as Art Deco columns displaying the names of past recipients of the Academy Award for Best Picture, with blank spaces left for future Best Picture winners, well into the 21st century. Currently the columns are set for Best Picture up to 2071. In a fashion reminiscent of Hollywood movie-making, the building is dressed before the Academy Awards ceremony, sometimes with a different sign on its facade, red drapery to hide its storefronts, and the famous red carpet running up its grand stairway.
According to wikipedia