In the PA section of Ballast we see Building efficiency factor stated for certain building types, say Hospital - 55%, Apartments- 65%, Office-75%...and so on.
I'd like to know from which source is this information being cited? Has anyone been able to spot these percentages in a book? I've scanned Problem Seeking and Planning & Urban Design Standards but didn't come across these numbers.
Would appreciate any pointers, thanks!
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