SR-1A
New Jersey's property-transfer and sales-ratio record used by the Division of Taxation in equalization and assessment analysis.
New Jersey example
Watchdog uses state-verified usable sales rather than treating every recorded transfer as an arm's-length comparable.
Official source
https://www.nj.gov/treasury/taxation/lpt/lptvalue.shtml
This is a plain-English summary. Rules and dollar amounts change, so check the official source or a professional before you file or sign anything.