From the outside, the design of the dome makes it seem smaller than it actually is. Its diameter is 384 feet, making it big enough to house a baseball field. It's 125 feet high, weighs 620 tons and is 110,000 square feet. Each of the 321 welded steel hexagons weighs roughly 2 tons.
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The building has changed hands and now is owned by KCS Rail.
http://www.psfk.com/2010/10/a-necessary-ruin.html
Thank you for giving credit where it is due. I believe the description reads "the world's first large industrial use of the geodesic concept," not that it was designed by Fuller.
Regrettably, this structure no longer stands.