was it built for the world fair?

Yes, for the 1962 World's Fair

Yes for the 1962 World Fair. Construction started 4/17/61, finished 12/8/61 and opened 4/21/62

I was there in 1962! And back for a visit in 2017. Seattle needs to clean up the area and create a better experience for visitors.

Yes

Yup, it was built for the 1962 world fair. Pretty neat.

Yes. Built for the world fair of 1962.