Simplify the following text for a Grade 3 native English-speaking person.
Original: At 871 feet ( 265 m ) tall , it is currently the seventh tallest building in Chicago and the 25th tallest in the United States .
Simplified: It is 265 meters ( 871 feet ) tall and has 66 floors . It was built in 1989 and is one of the tallest buildings in the world