calculate ARV in depressed area

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dont know what made me think of this but here goes. is there any simple way to calculate the ARV of a property thats in a run down but should be up and coming area where most of the surrounding houses are in the same disrepair? obviously nobody is going to want to try and rehab a house and sell it for say $100k in an area where all the rest of the houses on the block are only worth $30k at the moment. so how do you adjust for that when making your offfer?

I think I just discovered my answer lies within my question but WTF i'll throw it out here anyway