The 13-story earthquake resistant tower, designed by Welton Becket, was the world's first circular office building. It was completed in April of 1956, just north of the intersection of Hollywood and Vine. It currently houses the operations of Capitol Records. It also is home to the Capitol Studios well-known recording studios and renowned underground echo chambers, which are themselves over 20 feet (6.1 m) below ground level. It is located in the Hollywood Boulevard Commercial and Entertainment District, which is on the List of Registered Historic Places in Los Angeles. The rectangular ground floor is a separate structure, joined to the tower after it was completed. It was built to conform to the 150-foot (46 m) height limit imposed on all Los Angeles construction. Earthquake height restrictions were later lifted in 1964.