Steel Moment-Frame Retrofit: Altadena vs El Monte
How do steel moment-frame retrofit rules compare between Altadena, CA and El Monte, CA?
Altadena and El Monte have similar restriction levels.
Altadena, CA
Los Angeles County
LA County has no mandatory retrofit ordinance for pre-Northridge welded steel moment-frame buildings. LACoDPW follows FEMA 351-355 evaluation guidance and accepts ASCE 41-17 voluntary upgrades through Title 26 permits, with no countywide deadline.
View full Altadena rules →El Monte, CA
Los Angeles County
LA County has no mandatory retrofit ordinance for pre-Northridge welded steel moment-frame buildings. LACoDPW follows FEMA 351-355 evaluation guidance and accepts ASCE 41-17 voluntary upgrades through Title 26 permits, with no countywide deadline.
View full El Monte rules →Key Facts Comparison
| Fact | Altadena | El Monte |
|---|---|---|
| County mandate | None for unincorporated areas | None for unincorporated areas |
| Guidance documents | FEMA 350-355 SAC reports | FEMA 350-355 SAC reports |
| Evaluation standard | ASCE 41-17 Tier 3 | ASCE 41-17 Tier 3 |
| Common retrofit | Cover plates or RBS dogbones | Cover plates or RBS dogbones |
| Hospital rule | SB-1953 via OSHPD separately | SB-1953 via OSHPD separately |
Highlighted rows indicate differences between cities.
Altadena FAQ
Which buildings are pre-Northridge WSMF?
Welded steel moment-frame buildings designed under codes before 1994 — generally permitted before 1995. Common in mid-rise commercial offices built in the 1970s and 1980s, especially in San Fernando Valley unincorporated communities.
Are tenants notified of WSMF risk?
Not by county ordinance. California Civil Code §1102.6c requires seller disclosure of seismic hazards, but no specific WSMF disclosure exists. Voluntary evaluations are sometimes triggered by lender or major-tenant due diligence.
El Monte FAQ
Which buildings are pre-Northridge WSMF?
Welded steel moment-frame buildings designed under codes before 1994 — generally permitted before 1995. Common in mid-rise commercial offices built in the 1970s and 1980s, especially in San Fernando Valley unincorporated communities.
Are tenants notified of WSMF risk?
Not by county ordinance. California Civil Code §1102.6c requires seller disclosure of seismic hazards, but no specific WSMF disclosure exists. Voluntary evaluations are sometimes triggered by lender or major-tenant due diligence.
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