If you go here: http://sketchup.google.com/3dwarehouse/details?mid=6fdda327c88732c2207eb32548ae4290 you can download a 3D model of City Hall. If you also download google sketchup (free program) you can do all kinds of fun things with the 3D model including rotate and draw in things and get very accurate measurements.
May be more trouble that it's worth. But pretty cool...
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