Highest post office in a building

The highest post office in a building is Sky Post, a branch of China Post, which is situated at a height of 428 m (1,404 ft 2 in) on the 107th floor of the Canton Tower, Guangzhou, China. The Canton Tower is also the home to a further two Guinness World Records titles. With a height of 488 metres (1,601.05 ft), the world's highest observation deck can be found here. It also has a thrill ride, the “Sky Drop”, reaching a height of 485 m (1,591 ft 2.45 in), which holds the record for highest thrill ride.