Aging Buildings in Los Angeles: Common Safety Concerns

Los Angeles has one of the most diverse and extensive building inventories of any city in the United States. Thousands of structures across the city were built decades before modern building codes addressed the seismic, fire, and environmental hazards that we now understand far better than previous generations did. While many of these buildings have served their occupants well for 50, 70, or even 100 years, age brings a cumulative set of safety concerns that property owners, tenants, and community members should recognize.

This article examines the most common safety issues found in aging Los Angeles buildings and explains why proactive attention to these problems matters.

Seismic Vulnerability

Earthquake risk is the defining safety challenge for older buildings in Los Angeles. Construction practices and building codes have evolved dramatically since the early twentieth century, and each major earthquake has prompted code revisions that make newer buildings substantially more resilient than older ones.

Unreinforced Masonry (URM)

Unreinforced masonry buildings — constructed with brick, stone, or concrete block without steel reinforcement — are among the most vulnerable structures in any earthquake. Los Angeles launched a mandatory retrofit program for URM buildings in 1981, and the vast majority have been retrofitted or demolished. However, some remain, and even retrofitted URM buildings may not perform as well as modern construction in a major seismic event.

Soft-Story Wood Frame

Soft-story buildings feature a weak ground floor, typically an open parking area or commercial space, beneath stiffer and heavier upper stories. This configuration creates a concentration of deformation at the ground level during earthquake shaking, leading to partial or total collapse. Los Angeles mandated seismic retrofits for soft-story wood-frame buildings under Ordinance 183893, but compliance varies, and some owners have not yet completed the required work.

Non-Ductile Concrete

Concrete buildings constructed before the mid-1970s often used reinforcement detailing that does not allow the structure to deform and dissipate energy during an earthquake. These non-ductile concrete buildings can fail suddenly and catastrophically. The City of Los Angeles has identified these structures as a priority for mandatory retrofit, though the program's timelines extend over many years.

Pre-Northridge Steel Moment Frames

The 1994 Northridge earthquake revealed that certain welded steel connections in moment-frame buildings were prone to brittle fracture. Buildings constructed with these connection types before 1994 may harbor hidden vulnerabilities that are not apparent without detailed inspection.

Foundation and Settlement Problems

The soils underlying Los Angeles vary dramatically from one neighborhood to the next. Hillside properties contend with slope stability and expansive soils, while flatland areas may face issues with compressible fill, high groundwater, or liquefiable deposits. Over decades, these soil conditions can cause foundations to settle unevenly, crack, or shift. Signs of foundation distress include cracked interior and exterior walls, doors and windows that no longer close properly, sloping floors, and gaps between the building and adjacent flatwork.

In aging buildings, original foundation systems were often designed to less conservative standards than current practice requires. Shallow spread footings in areas with expansive clay soils, for example, may experience repeated cycles of heaving and shrinkage that progressively damage the structure above.

Deteriorating Structural Systems

All building materials degrade over time, and the rate of deterioration depends on the material, the exposure conditions, and the quality of maintenance.

Wood Decay and Pest Damage

Wood-frame buildings, which make up a large portion of LA's residential stock, are susceptible to decay from moisture intrusion, fungal growth, and termite or beetle infestation. Exterior walls, roof framing, subfloor structures, and particularly balconies and decks are common areas of concern. California's SB 721 and SB 326 balcony inspection laws were enacted specifically because concealed wood decay in exterior elevated elements had proven fatal.

Concrete Deterioration

Exposed concrete elements — parking structures, retaining walls, exterior walkways, and foundation walls — can deteriorate through carbonation, chloride exposure, and cracking that allows moisture to reach embedded reinforcing steel. Once rebar begins to corrode, it expands and spalls the surrounding concrete, accelerating the deterioration cycle. In coastal areas of Los Angeles, salt air accelerates this process significantly.

Steel Corrosion

Structural steel members, connections, and fasteners in older buildings may show significant corrosion, particularly in areas exposed to moisture or where protective coatings have failed. Corrosion reduces the cross-sectional area of steel members, diminishing their load-carrying capacity.

Fire and Life Safety Deficiencies

Older buildings were constructed under fire codes far less stringent than today's requirements. Common fire safety shortcomings in aging LA buildings include:

• Inadequate fire-rated separations. Walls and floors between dwelling units, between residential and commercial spaces, and at stairwell and corridor enclosures may not meet current fire-resistance ratings.
• Missing or outdated fire suppression systems. Many older buildings were not required to have automatic sprinkler systems. Where sprinklers exist, they may not meet current design standards.
• Insufficient egress. Stairways, corridors, and exit pathways in older buildings may be narrower, fewer in number, or more circuitous than current codes require.
• Electrical system hazards. Aging electrical panels, aluminum wiring, knob-and-tube wiring, and overloaded circuits all increase fire risk.
• Lack of carbon monoxide detection. Older buildings often lack the CO detection devices now required by California law.

Environmental Hazards

Buildings constructed before certain regulatory thresholds may contain hazardous materials that pose ongoing health risks.

Asbestos

Buildings constructed or renovated before 1980 may contain asbestos in floor tiles, insulation, roofing materials, textured coatings, pipe wrapping, and fireproofing. When these materials are disturbed during renovation or deterioration, asbestos fibers become airborne and create serious respiratory hazards.

Lead-Based Paint

Residential buildings constructed before 1978 may contain lead-based paint. Deteriorating lead paint produces dust and chips that are particularly dangerous to children and can contaminate soil around the building perimeter.

Mold

Chronic moisture intrusion in older buildings — from roof leaks, plumbing failures, or inadequate waterproofing — can produce mold growth that affects indoor air quality and occupant health. Older buildings are more susceptible because their waterproofing and drainage systems have degraded over time.

What Property Owners Should Do

Acknowledging that aging buildings carry elevated safety risks is the first step. Acting on that knowledge is what makes the difference.

Engage Qualified Professionals. Structural, seismic, and environmental evaluations should be performed by experienced, licensed engineers and specialists. A forensic engineering team serving Los Angeles can identify hidden deficiencies that visual observation alone will not reveal and can help prioritize which issues require immediate attention.

Comply with Mandatory Programs. If your building falls under any of LA's mandatory retrofit ordinances or state inspection requirements such as SB 721 and SB 326, ensure you are meeting compliance deadlines. These programs exist because the identified building types pose documented risks.

Invest in Maintenance. Many of the safety concerns in aging buildings are accelerated by deferred maintenance. Regular roof repair, waterproofing renewal, plumbing maintenance, and electrical system updates extend the useful life of building systems and prevent small problems from becoming major safety hazards.

Plan for the Long Term. Older buildings can remain safe and functional for many more decades with proper investment. Develop a capital improvement plan that addresses structural, fire safety, and environmental concerns in a logical sequence, and budget accordingly.

A Shared Responsibility

The safety of aging buildings in Los Angeles is a shared responsibility among owners, tenants, government agencies, and the professional community. The city's building stock tells a rich architectural and cultural story, and preserving that heritage while protecting the people who live and work in these structures requires vigilance, expertise, and commitment to ongoing investment in building safety.