I have an assignment for a refi. I have researched the data and know the subject value is going to fall below the most recent prior loan amount (2010) and prior sale price (2007), most likely a minimum of 20% due to market conditions. I know the borrower believes the home is worth 10-20% more than the prior loan amount and purchase price due to costs associated with some updating (items have a negative ROI). I know that I can just move forward and spend 15-20 hours completing the assignment (it is a complex property/location), and I'll get paid, however I am never comfortable putting homeowners in the position of paying for something (appraisal) and getting nothing (except an appraisal of course). Please know, my client did not ask for a predetermined value, nor did anyone. Basically - I just want to withdraw from the assignment because I know too much, however need advise on how to do this tactfully / what to say, without making up a BS lie.