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Re:Portland passes low-density zoning reform by freeone3000 on Wednesday August 26, 2020 @04:36PM (#24286979)
Setbacks are required in cities, otherwise many buildings wouldn't receive any natural light at ground level. Two- and three-story buildings don't really need them, the sidewalk is enough.
Re:Portland passes low-density zoning reform by extrapickles on Wednesday August 26, 2020 @05:07PM (#24287268)
Also setbacks help slow the spread of fire if one building catches on fire.
Re:Portland passes low-density zoning reform by Nasrudith on Wednesday August 26, 2020 @07:04PM (#24288302)
That brings to mind one crank concept for bureaucratic reform of explicitly embedded purpose formatted laws to slow the spread of fire and perhaps "generally accepted solutions" added after testing to skip design approval.

Thus you could use setbacks as firebreaks, firewalls, or say something exotic like aerogel barricades.