@Betsy Ross is spot on target. It is not easy to solve things after you already purchased a property. Here in Argentina they don't have home warranties and think of it as buyer before and what you see is what you get type purchases. The judicial system doesn't work here. The most important part of the process is having an excellent and ethical Escribano that will do a lot of due diligence ahead of time to make sure the property does not have any liens, encumbrances, past due bills, etc. You should be doing inspection before you purchase it.
On new construction they are mostly using true prices, however, keep in mind in many new projects, many owners are flipping their properties before the title deed is ready. So you can have a property owner that bought in a pozo for $100,000 early. He/she might decide to flip it and the value went up to $150,000. They might flip it and demand that you record the same $100,000 that they paid. That investor would then pocket $50,000 for no capital gain on paper. No name has been recorded yet on a title deed so on that new pozo that is an example where they might not sell unless you agree to that lower price. You have to be careful and understand all the various scenarios. Buying here is much more complicated vs. USA or other first world countries.