New Jersey's property records system is unlike New York's — and unlike most other states. It is a county-based system with 21 counties, each maintaining its own clerk's office, tax board, and recording procedures. On top of that, NJ has unique data sources like MOD-IV tax lists and SR-1A sales records that are powerful once you know how to use them. This is the complete guide.
The Block and Lot System
Every property in New Jersey is identified by a Block and Lot number within its municipality. Unlike NYC's Borough-Block-Lot, NJ block/lot numbers are assigned at the municipal level — so Block 100, Lot 5 in Newark is a completely different property from Block 100, Lot 5 in Jersey City. You always need the municipality to uniquely identify a parcel.
Some municipalities also use Qualifiers — an additional identifier for condominiums and co-ops. A condo unit might be Block 100, Lot 5, Qualifier C0201 (building C, unit 201).
You can find block/lot numbers through:
- Municipal tax assessor records
- NJ tax map GIS portals (many counties have them online)
- The NJ Division of Taxation's MOD-IV database
- County tax board records
MOD-IV Tax Lists
The MOD-IV is New Jersey's standardized property tax database maintained by each municipality's tax assessor and compiled at the county level. It is the single most comprehensive property data source in NJ, containing:
- Owner name and mailing address
- Block, lot, and qualifier
- Property class code (residential, commercial, industrial, apartment, vacant, farm)
- Land value and improvement value
- Total assessed value
- Building description (stories, rooms, year built, square footage)
- Land dimensions and acreage
- Sales date and sales price (from the last arm's-length transaction)
- Tax exemptions and deductions (veterans, seniors, disabled)
MOD-IV data is publicly available through each county's tax board or assessor website. Some counties, like Bergen County and Hudson County, have excellent online portals. Others require visiting the municipal tax assessor's office.
SR-1A Sales Records
Every real estate sale in New Jersey requires the filing of a Realty Transfer Fee form (RTF-1) and an SR-1A form. The SR-1A captures detailed sales data: sale price, property class, deed type, buyer/seller names, and whether the transaction was arm's-length or non-usable (family transfer, foreclosure, etc.).
SR-1A data is compiled by the NJ Division of Taxation and used to calculate equalization ratios — the ratio of assessed values to actual market values in each municipality. This ratio is published annually and is critical for:
- Understanding whether assessments are above or below market value
- Tax appeal arguments (if the ratio is significantly below 100%, assessments may be too high)
- Comparing property values across municipalities with different assessment practices
County Clerk Offices — Recorded Documents
Each of NJ's 21 counties has a County Clerk's Office that records deeds, mortgages, liens, and other instruments affecting real property. Online access varies significantly:
- Bergen County: Excellent online land records portal at bergencountyclerk.com. Search deeds and mortgages by name, date, or document type.
- Hudson County: The Register of Deeds provides online document search at hudsoncountyclerk.org.
- Essex County: The Register of Deeds offers online access through a third-party vendor (Landex).
- Middlesex, Monmouth, Ocean, Morris, Union: Most have online portals, though some charge for document viewing.
- Smaller counties: May require in-person visits or phone requests.
Note: In five NJ counties (Bergen, Essex, Hudson, Middlesex, Passaic), the office that records deeds is the Register of Deeds, not the County Clerk. The distinction matters when searching for the right office.
NJ DCA Construction Permits
Building permits in New Jersey are issued by local Construction Officials under the NJ Department of Community Affairs (DCA) Uniform Construction Code. The DCA maintains a statewide database of construction permits at nj.gov/dca/codes.
NJ construction permits include:
- Building permits (structural, mechanical, plumbing, electrical, fire protection)
- Certificates of Occupancy / Certificates of Approval
- Certificates of Continued Occupancy (CCO) — required in many municipalities before selling
- Demolition permits
- Zoning permits
The Certificate of Continued Occupancy is particularly important. Many NJ municipalities require a CCO or a smoke detector/CO detector inspection before a property can change hands. Violations found during the CCO inspection must be corrected before closing.
NJ Tax Appeals
NJ property owners can appeal their assessments to the County Tax Board (for properties assessed under $1 million) or the NJ Tax Court (for higher-value properties or appeals of County Tax Board decisions). Key dates:
- Filing deadline: April 1 in most municipalities (January 15 in municipalities that have undergone a revaluation)
- Evidence required: Comparable sales, income approach analysis, or appraisal
- Common ratio: The equalization ratio is used to determine whether your assessment exceeds the "upper limit" (115% of the average ratio)
NJ OPRA Requests
If property data is not available online, you can file an Open Public Records Act (OPRA) request with any NJ government agency. OPRA is NJ's equivalent of FOIA. Agencies must respond within 7 business days. Common OPRA requests for property research include building department files, code enforcement records, and tax assessor workpapers.
Environmental Records
New Jersey has one of the most aggressive environmental regulatory programs in the country. The NJ Department of Environmental Protection (NJDEP) maintains databases of:
- Known Contaminated Sites (KCS): Listed at nj.gov/dep/srp/kcsnj
- Underground Storage Tanks (UST)
- ISRA sites: Industrial Site Recovery Act — requires environmental cleanup before certain industrial/commercial properties change ownership
- Wetlands and flood hazard areas
NJ's ISRA requirement is unique: if a property has an industrial use (SIC codes covered by ISRA), the seller must obtain an environmental clearance from NJDEP before the sale can close. This can take months or years and may require expensive remediation.
How RegWatch Helps
RegWatch is building NJ property search coverage across all 21 counties. Search NJ properties using block/lot or address. We aggregate MOD-IV tax data, recorded documents, and construction permits into a single profile. sign up free to search properties across the tri-state area.