A constant cycle of building, decay, collapse, and rebuilding plus the occasional catastrophic fire gave the Old Town its characteristic irregular layout and chimney-strewn skyline.
Old Town's lack of catastrophes led to a regular layout and clean, distinct skyline.
mnli hypothesis: Old Town's lack of catastrophes led to a regular layout and clean, distinct skyline. premise: A constant cycle of building, decay, collapse, and rebuilding plus the occasional catastrophic fire gave the Old Town its characteristic irregular layout and chimney-strewn skyline.