New York City Subterranean Lot Tax Records

Digital Tax Map data from the New York City Department of Finance details subterranean lots, which are subdivisions of parent tax lots. The dataset is extracted from internal systems on the last Friday of each month and refreshed online on the 1st. It is part of a larger collection maintained by the NYC Department of Finance for property tax administration.

Use Cases

• Link subterranean lots to their parent tax lots using the PARENT_LOT and SUB_LOT_NUMBER fields for hierarchical property analysis.
• Analyze the EFFECTIVE_TAX_YEAR to track changes in tax lot status and subdivision history over time.
• Join this dataset with other property records using the SUB_LOT_BBL (Borough-Block-Lot) identifier for comprehensive parcel analysis.
• Map subterranean lot locations by borough using the PARENT_BORO and PARENT_BLOCK columns for spatial visualization.

Strengths

• Monthly update cycle ensures regular data refreshes from the Department of Finance's internal system.
• Provides a clear hierarchical structure linking subterranean lots to parent lots via PARENT_LOT and SUB_LOT_NUMBER.

Limitations

• The disclaimer states data may not reflect the latest changes in other city systems, such as exemptions.
• Sample data and total row count are unavailable, making initial assessment of data volume and completeness difficult.

Provenance

Source

New York City Department of Finance, via data.cityofnewyork.us.

Collection Method

Extracted from the Department of Finance's internal Digital Tax Map system.

Time Range

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Freshness

Updated monthly; data extracted on the last Friday of the month and published on the 1st.

Geography

New York City, New York, USA.