SAN FRANCISCO-Palo Alto-based Sun Microsystems, Inc. is taking the space in the 1.2-million-sf Foundry Square development under construction in downtown San Francisco. The developer is Wilson/Equity Office, which has developed more than 8,000,000-sf of class-A office space in the Bay Area. The aggregate value of the Sun lease is said to be $500 million.

If Sun leases space in all four buildings, its lease would total 885,000 sf, surpassing the 665,000-sf transaction by Chase H&Q earlier this year, according to a Wilson/Equity report, making it one of the largest deals in San Francisco history. The computer manufacturing giant has 45 days to decide whether it wants the extra space.

Sun employs about 29,000 workers, who helped the company generate $11.7 billion in sales last year. Currently, the company has one million-sf in Menlo Park, 260,000-sf in Palo Alto, 700,000-sf in Newark and 630,000-sf in Santa Clara. The newly acquired space at Foundry Square can hold up to 4,000 employees, many of whom could be spared the snarling Highway 101 gridlock commute.

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