As much a trademark of the city's skyline as the Golden Gate Bridge, this 853-foot (260-meter) high masterpiece is the tallest office tower in the city of San Francisco and is home to some of San Francisco's leading corporate organizations. Designed by world-renowned architects William L. Pereira and Harry D. Son, viewing the tower under the bright San Francisco skies is truly a breathtaking experience. Even though the elevator that ascends to the building's uppermost heights is no longer open to the public, there are a series of four high-definition video cameras installed on its primary spire that allow visitors to virtually experience how it feels to be at the top of the tower. The camera installations are collectively known as the Transamerica Virtual Observation Deck.