Transbay won’t rise as high as his Petronas Towers in Malaysia, but Cesar Pelli and his firm have won the rights to design what could become the tallest tower in San Francisco. Pelli Clarke Pelli Architects, teamed with developer Hines, were awarded exclusive negotiating rights yesterday to a choice site in downtown San Francisco owned by the Transbay Joint Powers Authority (TJPA), which seeks to rebuild the aging Transbay Terminal facility next door.