Changing styles in built-in cranes

Contrast the heavy-duty rooftop crane of the new 43-storey 5th & Columbia building to our west

EB4A5733 and when tucked away, ready to pop up:2017-08-10_20-52-30

to what sufficed for Two Union Square to our northwest when it was built thirty years ago:

IMG_9815

This is not a small boost.  Why the order-of-magnitude increase in size?  Architects?

About William Calvin

UW prof emeritus brains, human evolution, climate
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1 Response to Changing styles in built-in cranes

  1. Lilyan Snow says:

    Perhaps the company wanted a heavy-duty multipurpose crane. Since the ground-based luffing crane came down we’ve seen the crane lowering very large non-window-washing objects. The window-washing scaffold is also very large. It is L-shaped and appears to be of a sturdy construction, fitting around the northeast corner of the building, and possibly designed (I don’t know how) to hug the inward slope of the wall at that point.

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