DOI: 10.57761/525x-0r54
title: Cotality Smart Data Platform: Historical Property

description: If you have questions or concerns, please contact Regina Roberts at regirob@stanford.edu.
description: Title: CoreLogic Smart Data Platform (SDP) Historical Property

Historical tax assessment data for all U.S. states, the U.S. Virgin Islands, Guam, and Washington, D.C. Each table represents a previous edition of CoreLogic's tax assessment data.

The CoreLogic Smart Data Platform (SDP) Historical Property data was formerly known as the CoreLogic Tax History data. The CoreLogic SDP Historical Property data is an enhanced version of the CoreLogic Tax History data. The CoreLogic SDP Historical Property data contains almost all of the variables that were included in the CoreLogic Tax History data, as well as additional property-level characteristics.
description: In the United States, parcel data is public record information that describes a division of land (also referred to as "property" or "real estate"). Each parcel is given a unique identifier called an Assessor’s Parcel Number or APN. The two principal types of records maintained by county government agencies for each parcel of land are deed and property tax records. When a real estate transaction takes place (e.g. a change in ownership), a property deed must be signed by both the buyer and seller. The deed will then be filed with the County Recorder’s offices, sometimes called the County Clerk-Recorder or other similar title. Property tax records are maintained by County Tax Assessor’s offices; they show the amount of taxes assessed on a parcel and include a detailed description of any structures or buildings on the parcel, including year built, square footages, building type, amenities like a pool, etc. There is not a uniform format for storing parcel data across the 3,006 counties in the U.S.; laws and regulations governing real estate/property sales vary by state. Counties also have inconsistent approaches to archiving historical parcel data.

To fill researchers’ needs for uniform parcel data, CoreLogic collects, cleans, and normalizes public records that they collect from U.S. County Assessor and Recorder offices. CoreLogic augments this data with information gathered from other public and non-public sources (e.g., loan issuers, real estate agents, landlords, etc.). The Stanford Libraries have purchased bulk extracts from CoreLogic’s public records data, including mortgage, owner transfer, pre-foreclosure, and historical and contemporary tax assessment data. Data is bundled into pipe-delimited text files, which we upload to Redivis for preview, extraction and light analysis.


description: Each table contains a previous edition of the Historical Property data; in other words, the tables are snapshots of the CoreLogic Historical Property database as it existed in the past.



- Historical Property 1 = 2020-2021
- Historical Property 2 = 2019-2020
- Historical Property 3 = 2018-2019
- Historical Property 4 = 2017-2018
- Historical Property 5 = 2016-2017
- Historical Property 6 = 2015-2016
- Historical Property 7 = 2014-2015
- Historical Property 8 = 2013-2014
- Historical Property 9 = 2012-2013
- Historical Property 10 = 2011-2012
- Historical Property 11 = 2010-2011
- Historical Property 12 = 2009-2010
- Historical Property 13 = 2008-2009

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The Property, Mortgage, Owner Transfer, Historical Property and Pre-Foreclosure data can be linked on the CLIP, a unique identification number assigned to each property.



Census tracts are based on 2010 census.



For more information about included variables, please see ***Core\_Logic\_SDP\_Historical\_Property\_Codebook.xlsx**** *(under** Supporting files**).



Under **Supporting files**, users can also find record counts per FIPS code for each edition of the Historical Property data.



For more information about how the CoreLogic Smart Data Platform: Historical Property data compares to legacy data, please see ***Legacy\_Content\_Mapping.pdf ***(under **Supporting files**).



For more information about the terms of use, please see

***2022\_corelogic\_sdp\_end\_user\_license\_agreement.pdf*** (under **Supporting files**).