Local Law 97 · Building diligence

Local Law 97 exposure at 500 West 21st Street.

Reported emissions, current and 2030 caps, estimated annual penalty exposure, and per-unit monthly impact for 500 WEST 21 STREET — built on NYC’s public LL84 benchmarking dataset and PLUTO tax-lot records.

This is exposure analysis, not a penalty prediction. Real outcomes depend on offset purchases, REC strategy, future cap rule-making, and capital decisions by the board. The point is to surface whether the building is well-positioned, facing the 2030 step-down, or already in material exposure — and to put that read in the context an underwriter would use.

Address: 500 West 21st Street, New York, NY 10011
NYC reporting record: 500 WEST 21 STREET
Year built: 2013
Total square feet: 84,634
Residential units: 33
Primary use: —
Reporting year: —
BIN / BBL: 1090199 / 1006927502
Reported emissions: 0 mtCO₂e/yr

Source: NYC LL84 benchmarking & PLUTO (NYC Open Data) · Data refreshed July 2026

Data provenance & what this does not establish

Sources. NYC’s Local Law 84 energy and emissions benchmarking disclosures (NYC Open Data dataset 5zyy-y8am) and the Department of City Planning’s PLUTO tax-lot records. Our snapshot of both datasets was last refreshed July 2026.

Identity. Marketed address: 500 West 21st Street, New York, NY 10011. Government record: 500 WEST 21 STREET (BIN 1090199, BBL 1006927502). Building identity passed an automated BIN and tax-block cross-check against current city records on the last refresh; records that fail the identity gate are withheld from publication.

What this analysis does not establish. It does not establish the penalty the building will actually pay — offsets, renewable-energy credits, rule adjustments, and exemptions can reduce or eliminate exposure. It does not establish current retrofit work or board plans, which filings lag. It does not establish how any cost would be allocated to an individual apartment — that depends on the board. Read it as one input to diligence, and verify current plans with the managing agent, board minutes, and counsel.

Overall exposure

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Strong — under cap in both periods

Reported emissions are below the cap in both the 2024–2029 and 2030–2034 periods. The building is well-positioned under current LL97 rules; no near-term financial pressure from this law alone.

Penalty math by compliance period

2024–2029 (current period)

571 mtCO₂e/yr cap

Excess over cap: 0 mtCO₂e
Annual penalty exposure: $0 (under cap)
Per unit / month impact: —

2030–2034 (the cliff)

344 mtCO₂e/yr cap

Excess over cap: 0 mtCO₂e
Annual penalty exposure: $0 (under cap)
Per unit / month impact: —

Positive indicators

Under the 2024–2029 cap
Reported emissions of 0 mtCO2e/year are below the building's first-period cap (571 mtCO2e/year). No near-term penalty exposure under current rules.
Newer construction
Built 2013. Newer buildings tend to have more efficient envelopes and modern mechanical systems, reducing baseline emissions intensity.

Risk factors

Small unit count concentrates per-unit cost
With only 33 units, any capital project or penalty hits each shareholder harder. A $500K assessment in a 30-unit building = $16,700/unit; in a 200-unit building = $2,500/unit.
No reported emissions data
Reported emissions data is unavailable for the most recent benchmarking year. Either the building hasn't filed (a compliance issue in itself) or the data hasn't been published yet. Verify benchmarking status with the managing agent.

Three plausible ownership scenarios

How a board could plausibly respond to LL97 over the next decade. Each scenario translates the regulatory exposure into the per-unit financial impact a shareholder might actually feel — through maintenance increases, assessments, or a combination. The dollar ranges are illustrative — not building-specific estimates. Actual retrofit scope and cost require engineering analysis and a review of the building’s capital plan.

Scenario A — Minimal intervention

The board makes no major capital investment. Penalties are paid out of operating budget or via maintenance increases. No upgrade-driven assessment in this scenario; pure pay-the-fine path.

10-yr per-unit total: $0 – $0
Monthly per-unit: $0 – $0

Currently the building has no penalty exposure, so this scenario carries no direct LL97 cost. Future cap tightenings (2035+) could change this.

Scenario B — Capital upgrade path

The board funds a meaningful retrofit (heat-pump conversion, envelope work, controls modernization, electrification) via assessment, financing, or reserve drawdown. Penalties eliminated or substantially reduced; long-term operating costs typically lower.

10-yr per-unit total: $50,000 – $125,000
Monthly per-unit: $417 – $1,042

Higher upfront, lower long-term. The right path for boards with strong reserves and a long-view shareholder base. Many trophy-tier buildings on Park / Fifth / CPW are evaluating this now.

Scenario C — Delayed modernization

The board pays penalties for several years, then funds a retrofit anyway as the 2030 step-down or 2035 cap arrives. Combines the recurring penalty burden with the eventual capital event.

10-yr per-unit total: $62,500 – $156,250
Monthly per-unit: $521 – $1,302

The most expensive of the three paths. A common trajectory when a board defers the capital decision without a plan — and worth asking directly which of the three paths this building is actually on.

Underwriting a purchase at 500 West 21st Street?

LL97 exposure is one layer of building diligence. Reserves, assessment history, board posture, sponsor sales dynamics, and how the building’s capital plan interacts with the 2030 step-down all matter. The Roebling Team does this layer of work on every client transaction.

For the full building read on 500 West 21st Street, see the editorial profile — architect, history, board character, recent sales context.

Schedule a 30-minute consultation →

Methodology: exposure analysis runs on NYC’s public LL84 benchmarking and PLUTO datasets. Cap math uses the published 6.75 kgCO₂e/sf (2024–2029) and 4.07 kgCO₂e/sf (2030–2034) multifamily caps with $268/mt CO₂e penalty rate. Real-world penalties may differ based on REC/offset purchases, Article 321 adjustments, and future DOB rule-making.