Two firms were named to help sell the Arco Plaza.

A spokesman for the partnership formed by Atlantic Richfield, Bank of America and a subsidiary of RCA said that Eastdil Realty and First Boston Real Estate, both of New York, will help develop a marketing strategy for the twin 52-story Arco Tower offices, located at 5th and Flower streets. Arco and B of A intend to lease back space in the buildings, which serve as Arco’s world headquarters and the Southern California headquarters for Bank of America.