@Andrey Y.
Appraisal -
- At that transaction amount ($90k), the "Appraiser" does not even need a license (transaction value below $250k), and therefore, would not be bound by the same standards as a licensed Appraiser. This is even more true for a non-federally regulated Lender.
- Although it is unclear, I am assuming the condos they sold were all within the same project or neighboring projects. Contrary to some other comments, just because there are 2+ closed sales in the same complex/neighborhood, does not mean they are comparable transactions. The "Appraiser" should be able to discern those transactions involved the same Seller/Developer and therefore, may not represent typical market transactions. The Developer or investment group would not have the same motivation as a typical Seller, and therefore, those transactions may not represent "Market Value." This is why many Lender appraisal guidelines require a recent sale outside of the Subject's project and/or neighborhood (in new projects).
Anyway, unfortunately, since the Appraiser may not even be licensed, they also probably don't have any Errors & Omissions insurance to go after.
Also, the Appraisal report is for the Lender, NOT the Buyer. It is for the Lender to assess their risk in the transaction, which is why they are listed as the client in the report, and the Buyer is listed as the Buyer/Borrower only. This is true UNLESS a Buyer specifically gets their own appraisal separate from the Lending process. Practically speaking you (Buyer) get a copy of the report and should be able to generally rely on it, since it should be an "objective" assessment of the property's value, but again, in this case, the Appraiser may not even be licensed.
But, I'd imagine all the parties still have a responsibility of disclosure, including whether they knowingly sold you the condo for more than it's worth. But, proving that is the challenging part, since they will defer to the Appraisal and not be willing to divulge that they knew it was overpriced, etc.
With all that said, I am not an attorney and you should never take any advice from a social media and/or message board website, without fully vetting it and discussing options with an attorney. But, it does sound like it may be worth finding an attorney local to the Subject, and consulting with them to see if there is any recourse. If there was a licensed someone involved (Broker/Agent, Appraiser, etc), maybe there is a better chance for some relatively quick and easy resolution.
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On another note:
I'm sorry this happened to you and you don't deserve this. No one deserves to be scammed and taken advantage in this way. There have been many people that have been scammed and deceived, even after doing all the proper due-diligence.
Now that said, you are responsible for your actions, decisions and the situation you are now in. I would take an in-depth look at that local market, either doing your own statistical research, or contact a few top agents and independent property managers in the area. Find out what the short and long-term prognosis is, regarding, ease of re-renting, market rents (including historical and future guesstimate), typical "rent ready" costs, potential future appreciation, etc. Look at the data, your cashflow, etc, and decide your next move based on this information. My basic point is you already made a decision based on little or no info, now is not the time to make another uninformed decision.
Most of us that have been in the RE investing world have made decisions, that in retrospect, we might've done differently. These are what helps us to grow ...hopefully. ;)
Good Luck...