If the property has been foreclosed, then it will be in public records (http://www.miami-dadeclerk.com
). If it has not been foreclosed, you can use that same link to find the recorded mortgage; you can also ask a Realtor to see if there is a sale or tax record showing the purchase price and mortgage amount.
If your reason to discover that info is from a desire to purchase a home, then it has little bearing. The ultimate aribiter of the purchase price is what the market determines as the value. In a short sale, your Realtor will make a recommendation as to what an appropriate offer price would be, but ultimately, the investor who owns the note will decide what they are willing to accept. That decision is based on an independant determination of market value, as well as what the investor's ultimate goal might be.
If the property is foreclosed, then the asking price was set by both the bank and the listing Realtor. If the house is newly on the market, then there will be little flexibility. If the house has been on the market for more than 90 days, and there has been no price reduction, then there will be more flexibility. If there has been a reduction, then in most cases, the banks will not consider an offer that is more than 5% from their asking.