| So why did you post it after my comment seemingly disagreeing? That's a
| different subject/possibility; make that as a standalone point if desired.
|

I don't see why this is so complicated for you. There
was only one expert. He said the *design* seems OK.
You then said:

"but it looks like the preliminary conclusion is it wasn't design or
details. Hence it would almost have to be in installation/construction
or later modifications"

I disagreed with your conclusion. I think it's an
important point. The construction *could* be faulty,
but it was not necessarily a problem with the
construction or later modifications. A design can
be legal and officially approved while still being bad
and prone to failure. I gave 3 examples. The pictures
of this apt building lead me to think that the balcony
collapse may very well be a similar case.