Estimating ARV values in the Chicago area

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Hi,

I'm relatively new to Real Estate, I've been reading a lot of books for the last 6 months and I just started wholesaling properties. I have two main subjects that I feel I need to improve. Estimating ARV values and Repairs.

Sometimes is hard to estimate the ARV values for certain neighborhoods in my area. Prices can fluctuate block by block. I understand the concept of using "comps". However, prices in some neighborhoods very block by block. What factors do you take into consideration when estimating ARV values in neighborhoods like these?