As aahala mentioned, inform your broker or, barring that, your lender. The lender may or may not care, it’s up to the loan officer at this point.
You may want to shop around for another appraiser, but as astro mentioned, it needs to be one approved first by the lender. This is standard FDIC regulation (I assume your lender is FDIC insured…)
If you have reason to believe that the parties that were involved in the comparables used in the appraisal were related in any way, this is damning evidence against the comparables that were used. The specific phrase you want to use is “not arms length transactions.” If the appraiser in fact used sales that weren’t arms length, he fucked up tremendously, unless he a.) noted it in the write-ups of the comparables, b.) made some sort of adjustment to them to account for this, if necessary, and c.) had nothing else to work with. Now, it may very well be that these non-arms length transactions were at market values, and maybe actual good transactions won’t help your case, but they’re not considered to be good indicators of actual market value.
Basically, there’re two possibilities: the appraiser screwed up, or the appraiser is correct. If he or she is correct, I’d walk away from it unless there’s something about this condo that makes it worth that much to you (and you’re not scared of selling it for less money down the road). If you’re convinced the appraiser screwed up, do the stuff mentioned above, and be sure to note to the lender or broker that you believe the comparables used (“sales comps” in the lingo) were not arms length. Put together any solid evidence you’ve got of this to help make your case.
You may also want to shop around in your area for a different appraiser, preferably one that is “certified” by your state appraisal board, rather than one that is “licensed” (any appraiser will make note of this, if they mention that they are “licensed” then they probably are not “certified”). If you’ve got some time on your hands, your local county assessor may have an online database that you can check for recent sales in your condo development.
Good luck!
-desdinova, general real estate appraiser