Dallas - Understanding Highest and Best Use of Vacant Parcel

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Hello,

I am running across vacant parcels in Dallas that are zoned for multifamily and I am not sure how to go about pricing them for an end buyer that is interested in an eventual multifamily build. 

I've contacted local architects and they are suggesting expensive studies etc.

How should I go about this without coming out of pocket hundreds of dollars for every parcel I am trying to find the highest and best use for?

Thanks,

Nick