Own buildings in more than one city and the compliance question stops being "what does this law require" and becomes "how do these laws interact." The answer is not one rule. On the agencies' own pages, three different overlap models are now in force in different states, and assuming the wrong one either doubles your filings or leaves one missing. This playbook maps the three models, the audit-cycle mechanics, and the one genuine economy of scale, verified against primary sources in July 2026. Whether each building is covered at all is the threshold question; our city-by-city threshold guide handles that, and the deeper law-by-law detail lives in the 2026 BPS owner's guide.
The three overlap models, by state
| Model | Where | How it works |
|---|---|---|
| Local replaces state | California | Buildings reported under an approved local ordinance are exempt from the state AB 802 filing. The CEC lists 7 exempt cities: Berkeley, Brisbane, Chula Vista, Los Angeles, San Francisco, San Jose, San Diego. Its FAQ: "benchmarking and reporting to the local jurisdiction will fulfill compliance with the state program" |
| Local partially deemed | Colorado + Denver | Per the Feb 11, 2026 joint announcement, Energize Denver compliance "will count as compliance with the State's BPC performance targets," including Denver-granted adjustments. But owners "must continue to submit separate annual benchmarking reports to both the city and the State," and state fees still apply |
| State and local stack | Washington + Seattle | The state Clean Buildings law (energy targets, ASHRAE 100, state portal) and Seattle BEPS (emissions targets, city reporting) are separate obligations on separate schedules. Neither page contains any satisfies-the-other language; a covered Seattle building owes both |
Two California fine points that bite portfolios. First, the exemption runs one direction only; the CEC's FAQ warns: "Although your building might be exempt from a local reporting requirement, you may still be required to report to the state." A 60,000 sq ft building in a city whose local law stops at 50,000 sq ft still owes the CEC filing. Second, San Francisco states the happy case plainly, "Submitting one annual benchmark report to San Francisco satisfies both local and state regulations," and its May 1 deadline beats the state's June 1, so the SF filing simply is the filing.
Audit cycles: the work can be batched, the due dates cannot
The two big periodic audit laws run on fixed clocks set by code: NYC LL87 requires an audit and retro-commissioning every 10 years, in the year matching the last digit of the building's tax block number; LA EBEWE requires A/RCx every 5 years, by the last digit of the LADBS Building ID, due December 1. Neither city will move a date. But LADBS answered the portfolio question directly in its FAQ: owners with buildings due in different years cannot align the due dates, but "you can have the licensed professional ... perform the Energy A/RCx and Water A/RCx on all the buildings at the same time." The constraints: each building keeps its own report, and the work must be "completed no earlier than five years prior" to that building's due date, so a batched study is fresh for the earliest building and must stay inside the window for the latest. NYC offers its own consolidation valve: a co-op owning covered buildings on different blocks may file one consolidated EER, due in the latest building's year.
Can one audit satisfy two cities? Not as a filing. No program we verified accepts another jurisdiction's audit outright, and the standards differ in the details: LL87 requires an ASHRAE 211-2018 Level 2 audit performed by a New York PE or RA who is not building staff, reported on the DOE's Audit Template; EBEWE requires a California-licensed professional and references ASHRAE Guideline 0.2 for retro-commissioning, with LADBS receiving a signed declaration rather than the report. What is genuinely portable is the engineering work underneath: the programs increasingly reference the same national standards and tools, so a portfolio can commission one coordinated study and have each jurisdiction's professional produce that city's deliverable from it. And every program publishes named substitutes worth checking first: EBEWE waives the energy audit for buildings holding EPA ENERGY STAR certification in the right years, LL87 waives retro-commissioning for a specific legacy LEED-EB certification (the current LEED v4.1 O+M does not qualify), and San Francisco accepts a Strategic Decarbonization Assessment in place of its audit.
One Portfolio Manager record, five different ID numbers
The real economy of scale is the reporting backbone. ENERGY STAR Portfolio Manager is mandatory or standard for the NYC, San Francisco, California-state, LA-benchmarking, and Denver filings, so one property record with whole-building utility data feeds them all (getting that data is its own project; see the utility-data guide). What stays per-city is the plumbing: NYC wants the 10-digit BBL and the BIN, San Francisco wants the Assessor Parcel Number, the state of California assigns a Benchmarking Reference Number (which exempt-city buildings specifically should not add), LA keys on the LADBS Building ID, and Denver adds its own building ID plus a second submission step through the Energize Denver portal. Washington State submits through its own Clean Buildings Portal rather than an ESPM data request.
The gotchas that only exist at portfolio scale
- Coverage is decided differently per city. NYC publishes a Covered Buildings List every year and expects owners to check it; California is self-determined against the statutory criteria. A building missing from NYC's list is a records question; a California building nobody checked is a compliance gap.
- Aggregation rules differ. NYC counts buildings together on a shared tax lot (100,000 sq ft combined for LL84 and LL87; 50,000 sq ft combined for LL97); California's state program aggregates only buildings sharing an energy meter. The same campus can be one filing in one city and four in another.
- Deadlines cluster but do not match. May 1 (SF, NYC), June 1 (state of California, LA benchmarking, Denver, Washington's Tier 1 phase-in; Washington's Tier 2 lands July 1, 2027), December 1 (LA A/RCx), December 31 (LL87). The spring pile-up is why utility-data requests belong in Q1; the December audit dates are why batched A/RCx work gets scoped in summer.
- Floor-area definitions have different referees. The CEC measures gross floor area within the exterior walls and includes covered parking; NYC uses whatever the Department of Finance records say. Reconcile your rent-roll square footages against each authority once, and keep the workpapers.
The playbook, compressed: inventory every building with its jurisdiction, floor area, and IDs; classify each market against the three overlap models rather than assuming; calendar the real per-city dates; check the named substitutes before commissioning audit work; batch the audit engineering where the freshness windows allow; and run everything from one Portfolio Manager setup with per-city IDs done right. This coordination is exactly what Vert Energy Group's portfolio compliance service does year-round, and a free assessment will classify your markets and calendar the next 18 months in one pass.