/as:nyc-landmarks — LPC Landmark & Historic District Check

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Check if a NYC building is individually landmarked or within a historic district using the LPC Individual Landmark & Historic District Building Database. No API key required.

Usage

/as:nyc-landmarks 120 Broadway, Manhattan
/as:nyc-landmarks 1000770001          (BBL)
/as:nyc-landmarks 1001389             (BIN)

Steps 1–2: Parse Input & Resolve BBL

Read ../nyc-property-report/pluto-resolution.md (shared by all 7 NYC due-diligence skills) and follow it: parse the input (address, BBL, or BIN) and resolve via PLUTO.

This skill's extra: also store histdist from PLUTO — used in Step 3.

Step 3: Query LPC Database

Dataset IDs and field names are canonical in ../nyc-property-report/socrata-reference.md — on any disagreement, the reference wins.

Use the Individual Landmarks dataset (buis-pvji). Query by BBL first:

https://data.cityofnewyork.us/resource/buis-pvji.json?bbl={BBL}

If no results, fallback by block + lot. This dataset stores block/lot WITHOUT zero-padding (e.g. block 47, lot 7501) — strip leading zeros from the parsed BBL components:

https://data.cityofnewyork.us/resource/buis-pvji.json?$where=block='{BLOCK}' AND lot='{LOT}' AND borough='{BOROUGH}'

Key fields: lpc_name, lpc_lpnumb, desdate, landmarkty, lpc_sitede, lpc_sitest, lpc_altern, address, url_report

Also check PLUTO's histdist field from Step 2 — if it has a value, the property is in a historic district even if not individually listed in the LPC dataset.

Step 4: Print Results

## Landmark Status — {Address}

**Status: LANDMARKED / IN HISTORIC DISTRICT / NOT DESIGNATED**

| Field | Value |
|-------|-------|
| LP Number | {lpc_lpnumb} |
| Name | {lpc_name} |
| Designation Date | {desdate} |
| Type | {landmarkty} |
| Site Description | {lpc_sitede} |
| Site Style | {lpc_sitest} |
| Also Known As | {lpc_altern} |
| LPC Report | {url_report} |
| Historic District | {histdist from PLUTO} |

**Implications:** Exterior alterations require LPC Certificate of Appropriateness before DOB permit.

Source: [LPC Individual Landmarks](https://data.cityofnewyork.us/Housing-Development/Individual-Landmarks/buis-pvji)

If not landmarked and not in a historic district: "No landmark designation found for this property."

Conventions

• All dates: YYYY-MM-DD
• If Socrata returns empty array: "No results found"
• If HTTP error: note it and suggest checking the address
• If the user requests, write results to a file

Final Step: Disclaimer + Marker (required)

This skill produces regulatory output. End every report this skill produces — printed in chat or saved to a file — with the canonical disclaimer block from rules/professional-disclaimer.md, followed by one blank line and the machine-readable marker, exactly as shown:

> **Disclaimer:** This is an AI-generated analysis for preliminary planning purposes. All findings must be verified by a licensed professional before use in design, permitting, or regulatory submissions.

<!-- architecture-studio:requires-disclaimer -->

The marker is a single end-of-file sentinel — it appears exactly once, as the last line of the report. The post-write-disclaimer-check hook parses saved .md reports for the marker and blocks the write if the canonical disclaimer block is missing.