Carlos can tell us, but I believe the architect traditionally oversees his buildings, to prevent this very kind of problem. In this case, you’d have to assume that either there was no architect at all, or the builders chose not to pay the architect for this oversight?
Yes, theoretically an architect is competent and its duties include to oversee the buildings. But here constructon is a mere business. Normally they repeat typologies of buildings adviced by the real Estate offices (las inmobiliarias) and they obey without objection. That's why architecturequality levels are now not that good from those of the 1930's, which made remarkable buldings as the Kavanagh.
Many of the architects that builds today are inside a chain formed by developers, investors, Real Estate companies, and many people which lacks even the least interest in doing good architecture. If you are not inside this group, you will not have important jobs. Only small houses received by commissions of close friends, that's all.