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Old Posted Aug 17, 2020, 2:55 AM
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ardecila ardecila is offline
Join Date: Jun 2006
Location: the city o'wind
Posts: 14,746
Unfortunately owners are usually pretty reluctant to do something like this. Most basement space is used for something, and carving a passageway means you have to move something, somewhere else. If that something is part of the mechanical, electrical, or plumbing systems, then moving it could be very complex and disruptive.

If you want underground passageways free of charge, the best way is to do what several cities did in the 60s and 70s - encourage teardown and redevelopment, then let developers build taller in exchange for public benefits like underground connections. Most cities still do this, but the "public benefits" extracted from developers are usually things with a social-justice bent like affordable housing. Cities don't really have the leverage to get public infrastructure from developers anymore.
la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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