Structural & Seismic Construction · Los Angeles
The structural specialist behind Los Angeles’ landmark seismic retrofits and conversions.
Lehigh Construction Company has performed the seismic and structural concrete work on more than a hundred Southern California buildings — from the Eastern Columbia and The Standard to the Apple Tower Theatre — as the seismic structural subcontractor trusted by owners, engineers and tier-one general contractors. Led by a California-licensed Professional Engineer and general contractor since 1984.
- years in structural construction
- 40+
- construction & structural projects
- 145+
- landmark building conversions
- 30+
- Caltrans freeway bridges strengthened
- 16
We did the structural work behind the first adaptive-reuse wave. The second one just started.
When the 1999 Adaptive Reuse Ordinance turned Downtown’s vacant towers into housing, Lehigh Construction performed the structural work on more than thirty of those conversions — the lofts of Broadway, the Old Bank District and the Arts District.
In February 2026, Los Angeles extended adaptive reuse citywide: nearly any building 15 years or older can now convert to housing by right. Most candidates are pre-1977 concrete buildings that also carry mandatory seismic retrofit obligations under LAMC Division 95 — which makes conversion and retrofit one combined structural project. That combination is exactly what we have built for four decades.
What we do
Non-Ductile Concrete Building Retrofit
Structural strengthening of pre-1977 concrete buildings under LA's mandatory retrofit program — the hardest class of seismic work, and our specialty.
Adaptive Reuse & Conversion Structural Work
The structural subcontractor behind 30+ of LA's landmark conversions — Eastern Columbia, The Standard, the Pegasus, Toy Factory and more.
Seismic Strengthening & Structural Concrete
Shotcrete, shear walls, structural concrete reinforcement and voluntary seismic upgrades for high-rise, hotel and institutional buildings.
Historic & Landmark Building Retrofit
Strengthening irreplaceable buildings — theatres, Art Deco towers and hotels — without erasing what makes them worth saving.
Tilt-Up & Industrial Seismic Retrofit
Roof-to-wall anchoring and seismic strengthening for tilt-up warehouses, plants and retail — 40+ completed programs for owners and national tenants.
Subterranean Parking, Podium Decks & Shoring
Below-grade structure, podium decks, shoring and new parking structures — the heavy-structure scope that anchors urban projects.
Bridge & Infrastructure Seismic Strengthening
Caltrans state-freeway bridge seismic strengthening and retrofit — 16 structures on the 5, 10, 22, 60, 91/71, 101, 110, 405 and 605.
Shotcrete
Self-performed structural shotcrete — the core trade of seismic strengthening — placed by crews that have shot walls inside occupied landmarks for four decades.
Structural Concrete
Cast-in-place structural concrete for repairs, strengthening, new elements and heavy remodels — self-performed, engineer-supervised, in occupied buildings.
Landmark work
All projects →
Adaptive Reuse & Conversions
Apple Tower Theatre
802 S. Broadway, Los Angeles
Voluntary Seismic Retrofit / Tenant Improvement
Adaptive Reuse & Conversions
Brockman Lofts (Ph 1 & Ph 2)
530 W. 7th St., Los Angeles
12 Story Lofts Adaptive Re-Use / Seismic Upgrade
Adaptive Reuse & Conversions
Biscuit Lofts
1850 E. Industrial St., Los Angeles (Arts District)
12 Story Lofts Adaptive Re-Use + Seismic Upgrade + New Parking Structure
Adaptive Reuse & Conversions
Santee Court Phase 1 (Plaza + Parking Structure)
700/714, 716, 722/724 S. Los Angeles St., Los Angeles
3 Story Lofts Adaptive Re-Use + Seismic Upgrade + Parking Structure
Adaptive Reuse & Conversions
Olympic Lofts (Federal Reserve Building)
409 W. Olympic Blvd., Los Angeles
10 Story Lofts Adaptive Re-Use / Seismic Upgrade
Adaptive Reuse & Conversions
The Pegasus
612 S. Flower St., Los Angeles
14 Story Lofts Adaptive Re-Use / Seismic Upgrade
Your engineer’s drawings, read by an engineer.
Our principal, Mehrdad Houriani, is a California-licensed Professional Engineer and licensed general contractor — with a civil engineering degree from Lehigh University and a structural engineering degree from the University of Michigan. We work alongside your structural engineer of record, not around them: constructable feedback during design, pricing grounded in real sequencing, and field crews supervised with an engineer’s understanding of the load path.