More than 60 stories above the ground, construction workers climb makeshift stairs and cross narrow steel planks to put the finishing touches on Salesforce Tower, now San Francisco's tallest building.

The $1.1 billion skyscraper has already changed the city's iconic skyline, towering over old favorites like Coit Tower and the Transamerica Pyramid. Unlike in New York and Chicago, the new 1,070-foot (326-meter) high-rise is a gargantuan presence in this West Coast city.

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