AB 670 amends Government Code section 65400 to substantially expand what cities and counties must include in their annual planning and housing-element reports. The bill adds granular production data (including assessor parcel numbers), breakdowns by income tier and project type, density-bonus and Chapter 4.1 project summaries, and new demolition and replacement-housing reporting requirements — some provisions take effect for reports due April 1, 2027.
The bill also gives the Department of Housing and Community Development (HCD) explicit authority to adopt the standards, forms, and definitions that localities must use to prepare the housing-element portion of the annual report and establishes a short correction-and-rejection timeline with judicial enforcement backstops. Practically, AB 670 raises data and compliance obligations for local planning agencies, changes how HCD sets reporting rules, and creates new transparency (and potential litigation) pathways around housing production and demolition.
At a Glance
What It Does
It requires planning agencies to provide a far more detailed annual report to their legislative bodies, HCD, and the Office of Land Use and Climate Innovation, including parcel-level identifiers for entitlements, permits, certificates of occupancy, demolition approvals, and replacement units. HCD may issue binding standards, forms, and definitions for the housing-element portion of the report outside routine administrative procedure.
Who It Affects
All California cities and counties that submit housing-element annual reports; developers and project applicants whose filings must be reported with new data fields (including APNs); HCD and the Office of Land Use and Climate Innovation, which gain operational responsibilities; and researchers, advocates, and tenants who will have access to more granular production and demolition data.
Why It Matters
The law shifts the baseline for housing transparency and accountability by requiring machine-actionable, site-specific reporting that can be audited and litigated. That increases compliance costs for localities and applicants, accelerates state-level standardization of reporting, and could change how jurisdictions track replacement housing and demolition impacts.
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What This Bill Actually Does
AB 670 keeps the existing annual-report requirement but dramatically expands the list of data local planning agencies must collect and submit. The bill requires reporting not only on aggregate progress toward the regional housing need but on specific categories such as approvals and denials by income tier within "opportunity areas," the status of ministerial versus discretionary applications, and whether applications carry replacement-housing or relocation obligations under state or local law.
For production tracking, the bill asks jurisdictions to tie each entitlement, building permit, and certificate of occupancy to a unique site identifier — the assessor’s parcel number is required — and to separate rental from for-sale units by income level. Several new items are phased in for reports due April 1, 2027, including counts of replacement housing required or provided by project and demolition inventories that list approved and completed demolitions with APNs, dates, unit counts by tenure and income level, and any relocation assistance provided.The bill also directs HCD to adopt the standards, forms, and definitions localities must use for the housing-element portion of the annual report.
Those instruments are explicitly excluded from the typical state Administrative Procedure Act (APA) process under this law, which means HCD can promulgate mandatory reporting templates and definitions more quickly and with less procedural overhead. HCD obtains a short correction window: it may request corrections within 90 days of receipt, the planning agency has 30 days to comply, and HCD can reject reports that do not substantially comply.Finally, AB 670 builds an enforcement path.
If a jurisdiction misses the housing-element portion of the report deadline or submits a report that does not substantially comply, a court can compel compliance and impose sanctions; the provision applies to proceedings initiated after certain form-adoption milestones. HCD must also post submitted reports on its website within a reasonable time, creating a public record for monitoring production, demolitions, and replacement activity.
The Five Things You Need to Know
HCD can adopt mandatory standards, forms, and definitions for the housing-element portion of the annual report and those tools are explicitly not subject to the state APA (Government Code §65400(a)(2)(B)(ii)).
Within 90 days of receipt HCD may request corrections to a housing-element report; the planning agency has 30 days to make those corrections before HCD may reject the report (Government Code §65400(b)(1)).
Beginning with the report due April 1, 2027, jurisdictions must include, for each entitlement, building permit, or certificate of occupancy, a unique site identifier that must include the assessor’s parcel number and, starting that same date, the number of replacement housing units required or provided by income level (Government Code §65400(a)(2)(H)(i)-(iii)).
The bill requires a demolition inventory starting with the 2027 report that lists approved and completed demolitions by APN, date approved, number of rental and ownership units demolished, income level of protected units demolished, and relocation assistance provided (Government Code §65400(a)(2)(P)).
Localities may report deed-restricted affordable units at least 15 years old that received at least $60,000 per unit in local funds and substantial rehabilitation; such units may be included in the annual report but are excluded from certain affordability requirement calculations under Section 65913.4 (Government Code §65400(a)(2)(B)(v)).
Section-by-Section Breakdown
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HCD standards, forms, and definitions — expedited authority
This provision authorizes HCD to adopt the standards, forms, and definitions that local governments must use for the housing-element portion of the annual report and states that those instruments are not subject to the usual Chapter 3.5 APA rulemaking procedures. Practically, HCD will control the format and content of the core housing data, which standardizes reporting across jurisdictions but concentrates choice and discretion at the state level and reduces opportunities for notice-and-comment on form design.
Production tracking and opportunity-area breakdowns
The bill tightens production accounting: approved and disapproved units must be reported by income tier and by whether they are located in an "opportunity area" (as defined by the joint CTCAC/HCD Opportunity Map). For production milestones the report must distinguish rental from for-sale units and include a unique site identifier (APN). These mechanics make it possible to reconcile entitlement activity to building permits and certificates of occupancy and to verify whether jurisdictions are delivering housing in targeted resource areas.
Application status, density bonuses, Chapter 4.1, and special program reporting
Localities must report the number and status of housing development applications and note whether each is subject to ministerial or discretionary review, and — beginning in 2027 — whether replacement or relocation obligations apply. The bill requires granular data on density bonus applications and the concessions granted, and it adds reporting obligations for Chapter 4.1 projects and Section 65913.16 projects (including location, status, unit counts, and income categories). This creates traceability from incentives to outcomes.
Demolition and replacement-housing reporting (phase-in to 2027)
Starting with the report due April 1, 2027, jurisdictions must provide a demolition report listing approved and completed demolitions by APN, the number and income category of units demolished, approved uses for the site, and any relocation assistance provided. The bill also requires reporting of replacement-housing units required by law for non-housing development projects, specifying the approved/proposed location, developer, and anticipated completion date for each replacement project.
Correction, rejection, and judicial enforcement process
HCD can request corrections within 90 days; the local planning agency has 30 days to make requested corrections or face possible rejection. If a jurisdiction fails to timely submit a substantially compliant housing-element portion of the annual report, courts may compel compliance within 60 days and permit sanctions for continued noncompliance. The court retains jurisdiction to enforce its orders and may issue additional orders as necessary.
Public posting
HCD must post each submitted report on its website within a reasonable time after receipt, making the new site- and project-level data publicly accessible for monitoring by state agencies, researchers, advocates, and members of the public.
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Explore Housing in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- State agencies (HCD and Office of Land Use and Climate Innovation) — receive standardized, site-level data to monitor production, replacement housing, and demolition across jurisdictions, improving oversight and program targeting.
- Housing researchers and policy analysts — gain machine-actionable datasets (APNs, income tiers, entitlement-to-CO trails) that enable rigorous measurement of whether jurisdictions deliver housing where and for whom it’s needed.
- Tenants and displacement advocates — get systematic reporting on demolitions, protected-unit losses, and relocation assistance, improving transparency around displacement risk and local compliance with replacement obligations.
- Housing accountability litigants and watchdog organizations — new data and the statutory correction/rejection timeline create clearer grounds to challenge insufficient or late reporting and to seek court orders enforcing compliance.
Who Bears the Cost
- City and county planning agencies — will need staff time, GIS/APN matching, and possible IT upgrades to capture, validate, and submit the new site-level and income-tiered data, especially smaller jurisdictions with limited resources.
- Project applicants and developers — must supply more detailed application metadata and may face delays if jurisdictions lack systems to track replacement-housing obligations or to produce required APN-linked reports.
- HCD — gains expanded operational duties to create and maintain mandatory forms, process correction requests, publish reports, and potentially defend rejections or judgments; those duties require funding and capacity.
- Local jurisdictions subject to litigation — tighter reporting standards plus court enforcement increase litigation risk and potential sanctions for missed or noncompliant reports, imposing legal costs on cash-strapped cities and counties.
Key Issues
The Core Tension
The bill pits the state's interest in standardized, project-level transparency and enforceable accountability against local capacity, confidentiality concerns, and the practical costs of collecting and maintaining granular parcel-level housing data — a trade-off between auditability and administrative burden that has no clean technical fix without additional funding or detailed implementation guidance.
AB 670 increases transparency by design, but that transparency comes with implementation trade-offs. Requiring APNs and per-project identifiers improves auditability but forces local IT and permitting systems to be more interoperable with HCD’s templates; many jurisdictions will need to invest in staffing or software to produce the reports reliably.
The bill does not appropriate funds to support that buildout, creating a likely fiscal and operational gap for smaller jurisdictions.
The statute gives HCD the power to impose standards and forms outside the APA, which speeds standardization but reduces procedural safeguards like public notice and formal comment. That raises questions about how HCD will balance the need for stable, machine-readable formats against local variation in permitting systems and confidentiality concerns.
The statute also requires public posting of site-level information; while transparency advocates will welcome that, some data elements — for example, APNs tied to projects on culturally sensitive tribal lands or to properties subject to confidentiality agreements — may create privacy, security, or tribal-consultation tensions that the bill does not resolve.
Finally, the correction, rejection, and court-enforcement sequence creates real teeth but also encourages adversarial compliance enforcement. Courts will be asked to adjudicate whether a report is in "substantial compliance," a fact-specific determination that could drive precautionary overreporting or conservative interpretations by local staff.
Where the law references replacement-housing obligations imposed by local, state, or federal law, inconsistent local definitions and recordkeeping could produce disputes over what counts as a replacement unit and when a jurisdiction has actually delivered required housing.
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