How to find the cost of land that has been developed.
I pulled a list of multi family developments constructed in the past 5 years. I am trying to figure out how much the developer paid for the raw land (or site in general). I checked costar and they don’t detail the sale for most properties. I checked the state registry for documents but when I found mortgages it only detailed the mortgages amount. When I check the tax info I can see sales but there no way to determine what sale was the land the developer built on. 

Are there other documents I should be checking? Is there somewhere else I should be looking? What are your suggestions?
[{"id": "g8uy1r9", "text": "This should be easily attainable from the local property appraiser. I've never seen a record that didn't have sales history. Make sure to confirm if there was any assemblage or not as well.", "replies": [{"id": "g8uyx17", "text": "Yup assemblages make this sort of thing such a pain in the ass. I would look through the register of deeds or clerk of courts sites and just search for the current owner as grantee, add up those transactions, boom", "replies": [{"id": "g8v70uw", "text": "Assemblage is the act of putting to 2 lots together.\n\nPlottage is the term you refer to however it's not just adding values of lots. Plottage is the increase in value by assemblage. A $35k lot assemblaged with another $35k lot can be worth $100k, it's not just $70k.\n\nThis makes it more difficult.", "replies": [], "depth": 3}, {"id": "g8vc32e", "text": "Yeah this is what I\u2019m dealing with many of the parcels developed were multiple parcels purchased zoned and approved for mf", "replies": [], "depth": 3}], "depth": 2}, {"id": "g8v6ouv", "text": "It depends on the state and how they did it. In Florida ot would be easy but not so much in Texas, where price disclosure is not required by the state. Also, the company holding the title could have been transferred and in papers would show as if no transaction was made.", "replies": [], "depth": 2}], "depth": 1}, {"id": "g8uz562", "text": "Check deeds. If you need to, go back to previous deeds until you get to something that looks like the developing entity.", "replies": [], "depth": 1}, {"id": "g8v0xd0", "text": "It could depend on if the land had all the approvals needed to built or if they had to obtain them. Doesn't answer how to find it but make sure you consider that when doing your analysis. A lot with building approvals and plan attached is much more valuable than one that has no site work/approvals in place.", "replies": [{"id": "g8v3rjp", "text": "Not to mention site work (topography etc)", "replies": [], "depth": 2}], "depth": 1}, {"id": "g8v2iyv", "text": "Are you looking at data from sites in a specific neighborhood or is it a larger geographic area?", "replies": [{"id": "g8vc9h2", "text": "An area of about 3 different towns. I\u2019ve checked tax records. The problem I\u2019m facing is it\u2019s hard to trace the original parcel addresses to the new 5 \u201ccomplex name\u201d drive address that was created with the complete complex.", "replies": [{"id": "g9tpxxv", "text": "Aha ok. You would do well to befriend a reliable broker at a local real estate agency then.", "replies": [], "depth": 3}], "depth": 2}], "depth": 1}, {"id": "g8v6qxh", "text": "Calculate reproduction cost of the improvement aka building or structure \nCalculate accrued depreciation by finding out the property's effective age\n\nAccrued depreciation = (Reprod or replacement cost \u00f7 economic life) \u2022 effective age\n\nSubstract this from the Reprod cost. \n \nIf there's a different between price at this point and current price, it's your land value.", "replies": [], "depth": 1}, {"id": "g8xbp48", "text": "Just look on the GIS system???\n\nJust give me the address and I\u2019ll pull it up for you.", "replies": [], "depth": 1}, {"id": "g99ocvf", "text": "Easiest solution is the registry. But it's not always easy to get that way. Once a lot is assembled, I don't have access to the value of the lots that went into it.\n\nI might do this if I were strapped for clear comps to work backwards from:\n\nTake some recent builds nearby, remove the cost of the structure and builder's margin and plot the land value on Wolfram Alpha (it's free) on a 3D regression using width, depth, land value. You'll get a formula approximating the relationship between frontage, depth, and land value. Input as many examples as your time allows.", "replies": [], "depth": 1}]