There are also list services for this information, but I cannot speak to the accuracy/quality of it. 

This triple posted as I was editing for accuracy...can't delete the extras, my apologies

I want to start by saying I am a realtor not a lawyer.You don't say if you used a realtor or not or whether a FAR BAR contract was used, but either way 'Caveat Emptor' applies, meaning the buyer has the responsibility to check the accuracy of the information given to them.   

Am looking to replace my book keeper - accuracy issues have come up multiple times...

I am considering developing a parcel of land into a 96 unit apartment complex and I was wondering if someone with experience could review the spreadsheet that I made for accuracy.

I have never used them so I can’t speak to the quality or accuracy.

We typically match at a 75% accuracy rate and would love to help you in any way we can!

I understand your dilemma @Stuart M. as an active investor/agent I find my self going back to the MLS again and again for accuracy.

For example, I was reading about this company called Seeable, they “use high-accuracy mobile mapping techniques to create augmented reality & virtual reality building visualization apps.”

@Chris Fincham, there's probably only one way of testing the accuracy of "Market value based on Realtor CMA". ie.