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The twin to Orange County’s tallest building officially opened for business Wednesday with a media unveiling overlooking South Orange County from about 300 feet up in the air.

The 323-foot-tall, 20-story 400 Spectrum Center office tower already is about 44 percent leased with seven tenants, said Steve Case, executive vice president for office properties at Irvine Company, Orange County’s biggest landlord. Its twin, which was completed about 1 1/2 years ago, is about 93 percent leased, with Mazda’s North American headquarters as its lead tenant.

Read more at The Orange County Register.

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