ORANGE COUNTY, CA-The former Unocal building in Costa Mesa has been put up for sale with an asking price of about $60 million, but brokers familiar with the listing tell that some prospective buyers are shying away because so many of the development’s tenants are involved in the turbulent dot-com industry.

The 12-story, 236,000-sf office building stands at 555 Anton Blvd. It was leased for years to Unocal 76 Products before the energy giant was acquired by Tosco Corp., which then moved most of the jobs out of state and left the building vacant.

The current owner, Denver-based Amstar Ltd., bought the complex from Bank of America for about $40 million in 1998. After making roughly $30 million in improvements, the complex was leased to a long list of tenants that include anchor BMC Software, and Epoch Internet.

Though the building is virtually fully leased, the fact that dot-com tenants occupy more than half the space may hurt the property’s marketability. “Buyers want real estate here, but a lot of them are worried about the ability of the dot-coms to keep paying their rent,” one Orange County broker tells If Wall Street continues to punish technology stocks, the broker says, “a lot more [high-tech] owners could wind up with a lot of empty space.”

Compounding problems, the building also stands on leased land. “Ground leases aren’t a problem for some buyers, but others don’t like them,” another local broker says.

Officials from owner Amstar say they aren’t worried about the building’s prospects. They also note that the property is being marketed by Jon Nesbitt, director of Cushman Realty Corp.’s Irvine office and one of the region’s top brokers.

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