Quote:
Originally Posted by Klippenstein
Ok, since I just reread the first post. I got more curious to know the area of a square block in Chicago. So it's about 225,000 sqft or .008 sq miles. Which means there's about 125 blocks in a square mile..
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yeah, in the regular chicago street grid, there are 8 "long" blocks to the mile, and 16 "short" blocks to the mile in the other direction, making for 128 "regular" chicago blocks per square mile.
subtracting out street ROWs, this makes for an idealized block with approximately 600' x 250' of useable area, or 48 standard 25' x 125' lots, double loaded along the alley.
so, 48 lots per block x 128 blocks per square mile = 6,144 lots per sqaure mile
so if that square mile was built out entirely with bungalows, and if we use the rule of thumb that ~2.5 people occupy each detached SFH, that would yield a density of 15,360 ppsm.
and if we instead could stick an average of two chicago-style apartment flats on every lot, and if we use the rule of thumb that ~2.0 people occupy each of those units, then that yields a much more urbanism-conducive density of 24,576 ppsm.
once again, this is all super-idealized, the math never works this neatly in the real world. but it's also interesting to note how it's not
that terribly far off either in many cases.
there's no square mile of land in chicago that is
entirely standard size residential lots and nothing else, which is why in the exercise i did that started this thread, you typically need to get closer to an average of about 2.5 flat units per standard chicago lot to get to ~25K ppsm.