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Silicon GraphicsCompany: Silicon Graphics
Campus: Mountain View, Calif.
What happened: SGI in 1997 moved into what many thought was the Taj Mahal of Silicon Valley--500,000 square feet of high-tech offices. But management turmoil and increasing competition from PCs badly wounded the computer maker. After several years of layoffs, SGI moved out of the sprawling facility, which is now leased by Google.
Campus: Redwood City, Calif.
What happened: The dot-com flameout started moving into its facility in 1999, but Excite@Home declared bankruptcy in 2001. The nearly 1 million-square-foot campus was empty for almost two years but is now slowly filling up.