The chief executives at Atlantic Richfield Co., the oil company once based in Los Angeles, ran their international empire from some of the most regal corporate offices ever created in Southern California.

That was then. Nowadays, the landlord can’t find a renter for the space’s 1970s-era sumptuousness.

Penthouse office floors with drop-dead views are vacant in some of the best office buildings in Los Angeles County, a sign of the troubled economic times and the gulf between what landlords think their top-shelf product is worth and what tenants are willing to pay. A survey by real estate brokerage Jones Lang LaSalle found a score of tall buildings downtown and on the Westside where the penthouses are vacant. In several of these buildings, the floors just below are also empty.

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