Digital Tax Map: Air Lots for NYC Property Records

Air Lots represent three-dimensional property rights above or below ground lots in New York City's official Digital Tax Map. Data is extracted from the Department of Finance's internal system on the last Friday of each month and refreshed on the 1st, with a dual-set (A/B) system for reliability. The columns suggest a relational structure linking air lots to their parent tax lots via identifiers like BBL (Borough, Block, Lot).

Use Cases

• Mapping three-dimensional property rights using AIR_LOT_NUMBER and AIR_LOT_BBL.
• Linking air lots to their underlying tax lots using PARENT_BBL, PARENT_BORO, and PARENT_BLOCK.
• Determining the applicable tax year for an air lot using EFFECTIVE_TAX_YEAR.
• Analyzing the hierarchical structure of property parcels using AIR_LOT_NUMBER and PARENT_LOT.

Strengths

• Data is updated monthly with a documented, reliable refresh cycle from the Department of Finance.
• Available on multiple platforms (Socrata, Data.gov), indicating official dissemination and importance.
• Implements a dual-set (Set A/Set B) release system to ensure data availability if one set has issues.

Limitations

• Key metadata like row count, file size, license, and author are consistently missing or listed as 'None' across all sources.
• The last updated dates provided (2026-05-28, 2026-04-12) are in the future relative to the current date, indicating potential metadata errors.
• The description is truncated ('Digital Alteration Book (DAB):</st') across all sources, suggesting incomplete documentation.

Provenance

Source

New York City Department of Finance (DOF) Digital Tax Map system.

Collection Method

Extracted from DOF's internal system on a monthly schedule.

Freshness

Last updated dates conflict: 2026-05-28 on Socrata vs. 2026-04-12 on Data.gov.

Geography

New York City, New York, USA.