Local Law 97 · Building diligence

Local Law 97 exposure at The South Star.

Reported emissions, current and 2030 caps, estimated annual penalty exposure, and per-unit monthly impact for 80 John Street — built on NYC’s public LL84 benchmarking dataset and PLUTO tax-lot records. Latest available reporting year: 2024.

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: 80 John Street, New York, NY 10038
NYC reporting record: South Star Condominium
Year built (city record): 1927
Total square feet: 200,610
Residential units (city lot record): 146
Primary use: Multifamily Housing
Reporting year: 2024
BIN / BBL: 1001115 / 1000687501
Reported emissions: 950 mtCO₂e/yr

NYC benchmarking records this property under “South Star Condominium” — typically an alternate address on the same tax lot, or the label the owner or managing agent files under. The BIN and BBL above tie the record to this building.

Source: NYC LL84 benchmarking & PLUTO (NYC Open Data) · Reporting year 2024 · Data refreshed September 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. The latest available benchmarking reporting year is 2024; buildings disclose annually, one year in arrears. Our snapshot of both datasets was last refreshed September 2026.

Unit count and year built. Per-unit figures divide by the residential units the city's lot record lists. The year built is the city’s figure. The building profile states its own count of residences and completion year, drawn from offering documents, city records or listings; a profile count is used here only when it is a single, exact figure for this building. Either count can be off: the city’s can include separately deeded rooms or non-residential units, a profile’s can predate combinations, and the city’s year built is an estimate.

Identity. Marketed address: 80 John Street, New York, NY 10038. Government record: South Star Condominium (BIN 1001115, BBL 1000687501). On the last refresh this record’s BIN and tax block were matched to the BIN and BBL in our building profile and checked for a conflicting tax lot (a condominium filing under its billing or parent lot is accepted); records that fail the check are withheld. It is an automated match against city records, not an independent confirmation of the building.

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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Moderate — under today's cap; material modeled 2030 exposure

Current emissions are within the 2024–2029 cap but materially exceed the 2030 cap. At the currently reported emissions level, modeled gross exposure would begin in 2030. Compliance costs, where boards incur them, can manifest as common-charge increases or assessments to fund retrofits — how a building funds compliance is a board decision this analysis does not predict.

Penalty math by compliance period

2024–2029 (current period)

1,354 mtCO₂e/yr cap

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

2030–2034 (the cliff)

816 mtCO₂e/yr cap

Excess over cap: 133 mtCO₂e
Annual penalty exposure: $35,764/yr
Per unit / month impact: $20/unit/mo

Positive indicators

Under the 2024–2029 cap
Reported emissions of 950 mtCO2e/year are below the building's first-period cap (1354 mtCO2e/year). No near-term penalty exposure under current rules.
Large ownership base spreads costs
With 146 units, any capital project or penalty is distributed across many unit owners, reducing per-unit impact.

Risk factors

The 2030 step-down in caps
Currently under the 2024–2029 cap, but the 2030 cap is materially stricter. At the currently reported emissions level, modeled gross exposure under the 2030 cap would be ~$35,764/year (~$20/unit/month) — before offsets, credits, or emissions reductions.
Older construction may require more extensive compliance work
Built 1927. Buildings of this vintage often carry older heating systems (steam, frequently oil or gas) and weaker envelopes; compliance pathways may require deeper capital intervention than in newer buildings. Whether that applies here depends on this building's actual systems and any work already done.

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 unit owner might actually feel — through common-charge 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 common-charge increases. No upgrade-driven assessment in this scenario; pure pay-the-fine path.

10-yr per-unit total: $980 – $1,274
Monthly per-unit: $8 – $11

Often the wrong path long-term — penalties compound and the 2035+ caps are stricter again. But it's how many boards default in year one.

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: $75,000 – $200,000
Monthly per-unit: $625 – $1,667

Higher upfront, lower long-term. The right path for boards with strong reserves and a long-view ownership 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: $94,730 – $251,274
Monthly per-unit: $789 – $2,094

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.

Emissions history

Multi-year reported emissions from NYC’s LL84 benchmarking. A downward trend signals the building is already executing an operational or capital response; flat or upward suggests the board hasn’t yet acted.

Year	Total emissions (mtCO₂e)	Intensity (kgCO₂e/sf)
2024	950	4.74
2023	930	4.80
2022	898	4.60

Underwriting a purchase at The South Star?

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 The South Star, 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.