When it comes to skyscrapers, we put a lot of trust in architects. We have to trust that they know what they’re doing, and these seemingly impossible buildings are safe to be in and around. It’s even harder to trust what used to be known as the Citicorp or Citigroup Center, now 601 Lexington Avenue, whose bottom floors are like four stilts, holding 50 stories of building above them. It looks like a strong wind would blow the whole structure over. And when the building was constructed in 1977, before some emergency repairs, that was true.