Quote:
Originally Posted by ardecila
Usually the structural system has limited capacity to support additional floors.
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This. A constraint that goes to even modern structures like
that one over here. They would manage to add only 6 floors to it - probably at a reasonable cost 'cause this is La Défense, not Central Paris - as it is being entirely refurbished. Yet the flexible concrete structure was built in 1970, that's not so old.
So it must be a whole different story to pre-war buildings, like those of the 19th century. Especially when their footprints would be narrow.
What Minato is showing is just regular upgrades within the old central city, and only a matter of a couple of floors in every case. They've been doing this for long to take pretty much everything to the 6/7-storey "Haussmannian" standard.
And back to the days of Haussmann (1850s/60s), new buildings were even slightly shorter, like 4 or 5 stories on average, I think.
It was all made of limestone and old steel; there was no flexible composite material such as concrete yet back then.
Constraints are really heavy in a real old urban fabric. Unless you'd destroy it all, but we'll never do that. We'd rather build taller buildings where they don't cause any harm to anything valuable.