I doubt that the WTC towers were built
with demolition in mind....Or the SEARS tower in Chicago, or the Empire State Building in NYC, or the CN tower here in Toronto...
I'm acquainted with structural, civil engineers and architects on a weekly basis.
Not one of them has said that high-rise buildings, either here in Canada or in the USA., are built with future demolition in mind.
[1] It's partly "psychological" [engineers and architects don't like to think about the future demolition of their steel girder, or steel and concrete 'babies'].
[2] It's partly "budgetary" [Why spend many millions of dollars, that contractors prefer to line their pockets with, fitting buildings with future safe-demolition features, when the structures may last centuries? Long after you are dead. ]

In fact the the opposite is the case:
They state that skyscrapers and high-rise buildings [those 30 stories or higher] have been built and are still being built with
PROLONGED & EXTENDED lifetimes in mind. Translation: They're built to last decades or centuries...maybe [with future upgrades] even longer.

Admittedly, that building industry attitude [I hope my boss is not reading this] that 'buries its head in the sand' regarding the inevitable future need to demolish or dismantle a true high-rise/skyscraper has a rather...selfish and irresponsible attitude regarding this.
I think 60 MINUTES should investigate!

And, indeed, I know from personal experience [having seen it myself] high-rise buildings built with say 'reinforced'
concrete are subject to astonishing erosive and even corrosive wear-and-tear....

I've seen 'reinforced' concrete
that had been curing for months [so it should have been reasonably hardened] but was eroded by overhead water leakage over a period, off-and-on, lasting a few weeks;
water-erosion pits forming almost a centimeter deep....

Imagine what humidity, acid-forming smog, internal
corrosion of the r-bar [by osmosis] would do over centuries?
And I'm not even talking about the
obsolete practices of building steel-girder
skyscrapers [like Empire State Bldg] with
rivets [girder-structures are now welded]
that are subject to often overlooked internal metallurgical flaws, corrosion, internally and externally, due to rust and acidic
smog, etc., or the fact that rivets and girders will eventually succumb to metal fatigue.

Jacob