update, and he turned up at a meeting of the cupertino city council to unveil plans for apple's ambitious new headquarters. >> i think we do have a shot at building the best office building in the world. >> reporter: in the summer of 2011, by stock market value, apple passed exxon to become the most valuable company in the world. even as his health deteriorated, steve jobs seemed as competitive as ever, always pushing to keep apple at the forefront of the fast changing digital revolution. john blackstone, cbs news, san francisco. >> reaction to jobs' death is pouring in. president obama said in statement, the world has lost a visionary and there may be no greater tribute to steve's success in the fact that much of the world learned on his passing on a device he invented. microsoft chairman bill gates said the world rarely sees someone who has had the profound impact steve has had. the effects of which will be felt for many generations to come.