IF YOU WANT to go unicorn spotting, take a turn around the brand-new park on top of San Francisco's Transbay bus terminal. This is not because it is perched on a spectacular, undulating building that itself looks quite like a mythical beast (Moby-Dick, in this case) nor because its tastefully planted flora, all native to flower-power California, offer a particularly enticing equine habitat. It is just that, as a would-be icon of San Francisco's business district, the park is conveniently placed for looking out on their corporate headquarters.
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