i've never seen frame construction zero lot line homes in chicago. when we do have zero lot line homes directly next to each other, they're always brick and built right next to each other (no absurd 8" gap like that houston example).
when there is a gap in chicago (and gaps are common), it's typically 3' or so to serve as a gangway from the front to the back of the property, a fire code regulation that harkens back to the days of the great fire.
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"Missing middle" housing can be a great middle ground for many middle class families.
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