Question about NYC Commercial Real Estate Land Data
My question is on the NYC market. I am trying to get data on land values in Brooklyn to properly get the value on a assemblage I have. 

There is freely available data that shows land purchases on Zillow, Redfin, etc. I typically see if there is an approved DOB plan for an individual land sale to calculate price per buildable sq ft.

One thing that I do not see is if a developer completes or is trying to complete an assemblage over time. Does software like Costar have that data? Or is it the just local knowledge.
[{"id": "id8wlh7", "text": "Not sure about NYC but I would manually check the new ownership of the land deals you can find and also GIS map other parcels or buildings they own next door or close. Match the entity names and also check the address of each as some will have multiple entities to do an assembly. I would imagine a decent assembly would take a fairly long time so just current sales won't get the data you need. \n\nSounds like fun, good luck with the project.", "replies": [{"id": "id9m5pp", "text": "Yea you basically hit what I do on the money with the publicly available data. \n\nWas just wondering if someone started to consolidate that data already with software. Didn\u2019t have access to Costar or the other professional programs so was just wondering if it was already out there.", "replies": [], "depth": 2}], "depth": 1}, {"id": "id9csm4", "text": "Nyc Zola then go to acris for comps by viewing deeds", "replies": [{"id": "id9lxbk", "text": "Yea that is what I am typically doing. Whenever I see a land sale and DOB new filing I can calculate the relevant ppbsf for the area I am focusing on.\n\nSome sales I can pick up by pattern of sales but sometimes the assemblages take a while to complete and are purchased by different LLCs. Can\u2019t find the owner until they merge the lot or do a DOB filing.", "replies": [], "depth": 2}], "depth": 1}]