Historic and coastal overlays: where extra review comes back

Two overlays keep their teeth no matter how streamlined the base entitlement is. First, historical resources: under Pub. Res. Code § 21084.1 (in the CEQA statute), a project that may cause a substantial adverse change to a historical resource has a significant environmental impact — categorical exemptions weaken against them, and the ministerial statutes screen out sites requiring demolition of designated resources.

Second, the coastal zone: the Coastal Act (Pub. Res. Code §§ 30000–30900) layers a coastal development permit (CDP) over local land-use approval, run under the city's certified Local Coastal Program with appeal exposure to the Coastal Commission in mapped areas.

A resource is "historical" if it's listed in (or eligible for) the California Register (Pub. Res. Code §§ 5020–5029.5), in a local register/survey, or if substantial evidence supports eligibility. Age alone doesn't designate — but most surveys sweep buildings 45–50+ years old, which in California means nearly all pre-1980 stock deserves a screen.

• Underwriting watch-outs:
• Order a records search (local survey + Built Environment Resources Directory) and, on any plausible candidate, a qualified evaluation memo during escrow — an eligibility finding after close reprices the deal.
• Demolition of a historic resource typically forces an EIR (impacts rarely mitigable below significance) and disqualifies AB 2011/SB 423-style paths.
• Local HPOZ/landmark ordinances add certificate-of-appropriateness processes independent of CEQA.
• The upside case: certified rehabilitation earns the 20% federal credit (IRC § 47) plus California's state historic credit (14 CCR § 4859 series) — adaptive reuse can out-pencil demolition once credits and the Historical Building Code's flexible standards are counted.

In the coastal zone, development — broadly defined, including demolition and most intensity changes — needs a CDP. Where the LCP is certified, the city issues it applying LCP standards; in appealable areas (mapped near shorelines, wetlands, etc.) approvals can be appealed to the Coastal Commission de novo. Where no certified LCP exists, the Commission itself permits.

• Underwriting watch-outs:
• Confirm three maps before pricing: zone boundary, LCP certification status, and appeal jurisdiction. Each changes process risk a tier.
• Density-bonus law applies in the coastal zone and SB 423 now reaches it with coordination provisions — but LCP standards (height, visual, hazard) remain real constraints; a waiver strategy needs coastal-specific analysis.
• Mello Act replacement duties attach to coastal demolitions/conversions of low-mod housing (see the relocation guide).
• Sea-level-rise and hazard policies increasingly drive setbacks and design in updated LCPs — check the LCP amendment pipeline, not just the current text.

Run the overlays in the site-selection phase: a negative historic screen and an out-of-zone confirmation cost a few thousand dollars and preserve every streamlining option. Where an overlay is live, re-plan the path — adaptive reuse with credits for historic stock; LCP-conforming design with early Commission-staff consultation for coastal sites — rather than discovering the overlay as a comment letter on your exemption.