Good Morning America aired from its brand-new studio at the Robert A. Iger building in New York City on Monday, June 16; To celebrate the relocation, some friendly faces from ABC

Dane -- who shot to fame amid six seasons on the hit ABC drama "Grey's Anatomy," where he played Dr. Mark Sloan, affectionately known as "McSteamy" -- said his symptoms began over one year ago, when he began to experience weakness in his right hand.

“My left side is functioning, my right side has completely stopped working.”