Hawthorne — Historic Preservation

Overview

Hawthorne’s historic‑resource rules live in Title 18 with a dedicated chapter — Chapter 18.39—Historic Resources Preservation — and cross‑referenced review standards in § 18.20.070(G). The code recognizes a Historic Downtown Area and designated landmarks, and routes exterior work on historic resources to the Planning Commission, applying the Secretary of the Interior’s rehabilitation standards. Owners of historic structures also carry an ongoing duty to keep them in good repair.

Any exterior addition or alteration to a historic resource must be reviewed by the Planning Commission (acting as the historic preservation commission) and be consistent with the Secretary of the Interior’s Standards (§ 18.20.070(G)).

What is considered “historic” in Hawthorne

• Historic resources and designated landmarks are addressed in Chapter 18.39 (title provided in source materials) and via the review criteria in § 18.20.070(G).
• The code also calls out a defined Historic Downtown Area with added preservation policies and design criteria (§ 18.07.055).
• A separate “inventory” is referenced in Chapter 18.39; for one provision, the inventory reference is limited to the “Main Street Bridge” in § 18.39.045 (see “Main Street Bridge” entry below).

If your property is a potential or listed resource, expect project review under § 18.20.070(G), in addition to base zoning from Hawthorne Zoning and Hawthorne Development Standards.

How historic project review works (citywide)

• Decision maker: The Planning Commission serves as the historic preservation commission for additions and exterior alterations to historic resources (§ 18.20.070(G); § 18.08.055(A)).
• Required standard: The Commission “shall be guided by” the Secretary of the Interior’s Standards for Rehabilitation (§ 18.20.070(G)).
• Approval findings: The code lists seven approval pathways (any one can support approval), including that work is consistent with an adopted plan, is necessary to maintain or restore historic form, is a minor change that avoids historic fabric, retains essential elements, maintains continuity and scale, avoids significant adverse effects, and incorporates recommended conditions (§ 18.20.070(G)(1)–(7)).

Related processes such as design review, overlay districts, and variances and exceptions may also be implicated depending on site and scope.

Ongoing duties and special allowances for historic structures

• Good‑repair obligation: Owners of historic structures must maintain structures and premises in “good repair” to prevent deterioration and keep them usable for a lawful purpose; routine maintenance is not a change in design/material/appearance (§ 18.08.055(B)).
• Alterations and demolition: Alterations (and proposed demolition) to designated landmarks are reviewed by the Planning Commission, which may consider recommendations from a Council‑appointed advisory body (§ 18.08.055(A)).
• Change of use within a historic structure: Conversions (e.g., residential to commercial) may receive exceptions to otherwise applicable development standards “where applicable,” to preserve integrity (§ 18.08.055(C)). Coordination with the California Building Standards Code can arise via the State Historical Building Code where applicable (§ 18.08.055(C)).

Historic areas and resources — district-by-district

Historic Downtown Area

• Purpose: Preserve structures that exemplify historic architectural styles and the area’s heritage; ensure new development fits the established fabric (§ 18.07.055(A), (C)).
• Where it applies: The code references a “historic downtown area” and Main Street frontage; boundaries are not included in the source materials (§ 18.07.055).
• Typical permitted uses: Base uses come from the underlying zoning; historic rules add design/compatibility review, not new use categories (§ 18.07.055(A); see Hawthorne Land Use).
• Key dimensional/compatibility standards:
  • New construction shall match the scale and style of predominant older structures (§ 18.07.055(C)(1)).
  • Maintain continuity of building lines along Main Street (§ 18.07.055(C)(2)).
  • Maintenance duty applies to all properties in the district (§ 18.07.055(B)(2)).
  • Alterations/demolition within the district are subject to Planning Commission review, with potential input from a Council‑appointed advisory body (§ 18.07.055(B)(1)).

Note: General frontage controls (e.g., maximum 3–4 ft front fence within 15 ft of a street when solid vs. at least 50% open) apply citywide and can affect historic street character in the district (§ 18.07.030(G)(3)).

Designated Landmarks (citywide)

• Purpose: Protect individual properties formally recognized for historic significance (§ 18.08.055).
• Where it applies: Any site designated as a landmark under the City’s designation procedures (designation criteria referenced in Ch. 2.48 per § 18.07.055(A)(1); not included in the source materials).
• Typical permitted uses: Underlying zoning controls uses; changes in use may be granted exceptions to development standards to maintain historic integrity (§ 18.08.055(C)). See Hawthorne Zoning.
• Key standards:
  • Alterations and demolition proposals are reviewed by the Planning Commission (§ 18.08.055(A)).
  • Owners must keep the property in good repair (§ 18.08.055(B)).
  • Where applicable, the State Historical Building Code may be used; safety upgrades may be required with intensification of use (§ 18.08.055(C)).

Citywide Historic Resources (inventory and review standard)

• Purpose: Apply consistent rehabilitation standards to any listed historic resource (§ 18.20.070(G)).
• Where it applies: Any “historic resource” as recognized by the City’s inventory/ordinance (Chapter 18.39).
• Typical permitted uses: Uses derive from the base district; historic review focuses on the manner of change, not the allowed use list (see Hawthorne Development Standards).
• Key standards:
  • Secretary of the Interior’s Standards guide design decisions (§ 18.20.070(G)).
  • One or more of seven approval findings must be supportable (§ 18.20.070(G)(1)–(7)).
  • The Planning Commission may incorporate conditions and consider advisory recommendations (§ 18.20.070(G)(7)).

Main Street Bridge (specific resource called out in Chapter 18.39)

• Purpose/where it applies: For the purposes of § 18.39.045, references to “any historic resource on the inventory” are expressly directed to the “Main Street Bridge” (per Chapter 18.39 note in source materials).
• Standards: Not detailed in the provided text; any project would still be reviewed under § 18.20.070(G).
• Note: Not found in source materials whether this named resource is within Hawthorne; verify applicability.

Key decision points and standards table

Practical guidance

• Treat the Secretary’s Standards as your design brief. Show how each exterior change preserves essential architectural elements and neighborhood scale, and why any modern materials won’t harm historic fabric (§ 18.20.070(G)(3)–(6)).
• If you need a different use to keep a historic building viable, build a case for targeted relief from development standards tied to integrity, not convenience (§ 18.08.055(C)).
• For downtown sites, draw street sections and massing studies proving your project keeps continuous frontages and matches prevailing heights and proportions (§ 18.07.055(C)(1)–(2)).
• Coordinate early with design review staff; the Commission can consider advisory recommendations and condition approvals (§ 18.08.055(A); § 18.20.070(G)(7)). Expect to also address signage, parking, and other site standards, even on historic projects.

Checklist

• Confirm whether the property is a designated landmark or listed historic resource under Chapter 18.39 (inventory/criteria not provided in source materials).
• If in the Historic Downtown Area, document compliance with scale/style and Main Street building‑line continuity (§ 18.07.055(C)).
• Prepare a scope narrative keyed to the Secretary of the Interior’s Standards, addressing each applicable item (§ 18.20.070(G)).
• Assemble existing/proposed drawings highlighting preserved “character‑defining features” and any reversible interventions (§ 18.20.070(G)(4)–(6)).
• If proposing a change of use, justify any needed exceptions to development standards as necessary for preservation (§ 18.08.055(C)); coordinate any Historical Building Code approach with building officials.
• Include a maintenance plan if requested, demonstrating ongoing “good repair” (§ 18.08.055(B)).
• Cross‑check other applicable standards (e.g., signage, parking); apply variances and exceptions only if truly needed.

Risks & Ambiguities

Plain-English Summary

Hawthorne requires Planning Commission review for exterior work on historic resources and uses the federal rehabilitation standards as the design test. Downtown, new buildings must line up with established storefronts and match the scale of older buildings. Landmark owners must keep properties in good repair, and use changes inside historic buildings can get tailored relief from other development rules when necessary to preserve integrity.

Source References

• Hawthorne Zoning Code — Chapter 18.39, Historic Resources Preservation (chapter title in source materials; includes note on § 18.39.045/Main Street Bridge)
• § 18.20.070(G) — Historic resource review standards and findings (Planning Commission as historic preservation commission; Secretary of the Interior’s Standards)
• § 18.07.055 — Historic downtown area, structures, new development criteria, maintenance duty
• § 18.08.055 — Historic structures: alteration/demolition review, maintenance in good repair, change of use/exception allowance
• § 18.07.030(G)(3) — Street‑adjacent fence height limits (context for downtown frontage character)

Information Gaps

• Current list and map of designated landmarks and historic resources (inventory)
• Exact boundaries of the Historic Downtown Area
• Any demolition‑specific standards or moratoria for historic resources
• The content of Chapter 18.39 beyond the limited note on § 18.39.045
• Whether the “Main Street Bridge” reference applies within Hawthorne

Source passages

• Hawthorne Zoning Code (§ 18.08.055) Medium relevance show source text
• Hawthorne Zoning Code (§ 18.07.055) Medium relevance show source text
• Hawthorne Zoning Code (§ 18.07.030) Medium relevance show source text
• Hawthorne Zoning Code (§ 18.20.070) Medium relevance show source text

Cited sections

• Hawthorne Zoning Code — Chapter 18.39, Historic Resources Preservation (chapter title in source materials; includes note on § 18.39.045/Main Street Bridge) (Chapter 18.39)
• § 18.20.070(G) — Historic resource review standards and findings (Planning Commission as historic preservation commission; Secretary of the Interior’s Standards) (§ 18.20.070)
• § 18.07.055 — Historic downtown area, structures, new development criteria, maintenance duty (§ 18.07.055)
• § 18.08.055 — Historic structures: alteration/demolition review, maintenance in good repair, change of use/exception allowance (§ 18.08.055)
• § 18.07.030(G)(3) — Street‑adjacent fence height limits (context for downtown frontage character) (§ 18.07.030)

• Official Hawthorne code library