Steve Freihon/Related-Oxford
New York, New York
Washington
1330 Connecticut Avenue, NW
Suite 300
Washington, DC 20036
United States
Phone: +1.202.580.6300
Fax: +1.202.580.6301
Our Team
Featured Washington Projects
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Featured Project
Social Security Administration National Support Center For facilities with a critical mission, security is paramount. With expertise in structural engineering and protective design, we make sure they’re safe.
Featured Project
Capital One Hall Careful design and collaboration brought everything into harmony for this high-end theater and events center.Additional Projects
Washington News
News
Structural Milestones Reached at Two Inova Hospital CampusesApril 15, 2026
Two major Inova hospital campuses in Northern Virginia have reached structural completion. See how integrated structural, acoustic, and vibration engineering is shaping next-generation healthcare environments.
Insight
Practical Decarbonization Beyond ElectrificationApril 07, 2026
Electrification is essential, but it is not the whole story. Real decarbonization requires a systems-based approach that accounts for energy, materials, infrastructure, and operational constraints.
News
Camden Yards Reopens with Targeted UpgradesMarch 27, 2026
Oriole Park at Camden Yards has been reimagined for today’s fans without losing what made it iconic. Behind the scenes, structural upgrades made it possible to install a larger video board and new premium spaces—balancing modern performance demands with the constraints of an existing stadium.
News
600 Fifth Featured in Modern Steel ConstructionJanuary 30, 2026
Thornton Tomasetti’s renovation of 600 Fifth Street shows how strategic steel integration enabled major structural transformation within an existing building.
News
Principal Ali Ashrafi Discusses Fire Forensics for Toronto's Thorncliffe Park Drive FireDecember 11, 2025
A persistent Toronto condo fire is highlighting the risk of hard-to-reach spaces. Principal Ali Ashrafi explains why the Thorncliffe Park Drive fire was so hard to extinguish.
News
Navigating Commercial Property Insurance Before a HurricaneSeptember 03, 2025
Secure your commercial property with our guide to hurricane insurance. Learn about essential coverage types, risk scenarios from major carriers and how to file a claim effectively.
News
Reflecting on Hurricane Katrina: 20 Years LaterAugust 04, 2025
The record-breaking 2005 hurricane season, with 27 named storms, highlighted the need for forensic analysis, and Katrina’s lessons continue to shape resilient design and coastal defenses, preparing communities for future climate-driven storms.
News
Karuruma Trail Bridge CompletedJuly 28, 2025
Thornton Tomasetti partnered with Bridges to Prosperity to construct a 60-meter trail bridge over the Akaruruma River in Rwanda, completed ahead of schedule. The bridge connects over 5,600 people across five communities to essential services, enhancing safety and livelihoods.
News
Preparing a Construction Site Ahead of a Major HurricaneJuly 01, 2025
Proper preparation can mitigate risks, protect valuable assets and ensure the safety of workers and surrounding communities.
We outline a comprehensive guide to securing your construction site ahead of a hurricane, drawing on our expertise in structural integrity and disaster resilience.
News
2025 Hurricane Season PreparationJune 01, 2025
Once again NOAA is predicting above-normal activity for the Atlantic hurricane season. We’ll delve into these predictions and offer some solutions on how best to prepare commercial and residential properties for before, during and after the storm.
News
Construction Underway On Karuruma Trail BridgeMay 22, 2025
Thornton Tomasetti volunteers are heading to Rwanda to help complete a 60-meter suspended bridge that will provide safe, year-round access for over 8,600 residents in two rural communities.
News
End of the Lull, Plus Storm-Tracking ResourcesSeptember 25, 2024
We experienced a brief lull in Atlantic hurricane activity in August, but it didn’t last long, as evidenced by the flooding brought by Hurricane Francine, and now Florida is bracing for Helene.
News
Midpoint Update: 2024 Atlantic Hurricane SeasonAugust 20, 2024
Now that we’ve reached the midpoint of the 2024 Atlantic hurricane season with five named storms, let’s take a look at the impacts of a few of the most recent.
News
Makurungwe Trail Bridge RecapJuly 26, 2024
The completion of the Makurungwe Trail Bridge marks a transformative moment for the local communities, promising hope and connection.
News
Preparing for the 2024 Hurricane SeasonMay 31, 2024
As the 2024 Atlantic hurricane season begins, we look back at 2023 and share some tips for evaluating building safety ahead of what’s predicted to be a historically busy year.
News
2023 Hurricane Season RecapDecember 19, 2023
The 2023 Atlantic Hurricane season was one of the busiest on record, yet most storms didn’t even make landfall.
News
How Hurricanes Have Influenced Building CodesNovember 16, 2023
Building codes set requirements related to design and construction, and major hurricanes have influenced state and local codes over the years.
News
Emergency PreparednessOctober 12, 2023
Emergency planning and preparedness may often come as an afterthought, but it is crucial to take a proactive approach that incorporates operations and maintenance considerations into early project stages.
News
Hurricane Season 2023: Mid-Season Check InOctober 02, 2023
The 2023 hurricane season has reached its midpoint; we take a look at how predictions have evolved and the impacts of the storms to date.
News
Rapid Assessment ApproachAugust 16, 2023
For specific geographic locations, hurricanes are a near certainty—it’s a matter of when, not if. Our firm has extensive experience helping clients both plan for the inevitable and execute a rapid assessment approach in the aftermath of a storm.
News
Flood Resilience for HurricanesJuly 10, 2023
Climate change brings rising water levels, rendering many structures vulnerable to potential flooding. In fact, scientists have predicted that global sea levels could rise by as much as 12 inches by 2050. Add hurricanes to the mix, and it’s more important than ever for owners to establish flood resilience strategies ahead of a storm.
News
Preparing for Hurricane Season 2023June 01, 2023
As we approach the start of the 2023 Atlantic hurricane season, let’s take a look back at the 2022 season, as well as the developing El Niño, and learn what this means for the season to come.
News
Trust & Partnership: MWBE as It Should BeJune 20, 2022
Our Washington, D.C., office has partnered with small, woman-owned structural firm A+F Engineers on more than 12 projects over 17 years. Representatives of both recently sat down to discuss their experience together.
News
2020 Showcase: Responding to the PandemicMay 09, 2021
When COVID-19 cases surged in the spring of 2020, and again last winter, our engineers, scientists and programmers lent a hand. Here are a few of the ways we helped our clients and communities meet some immediate challenges.
News
2019 Green Offices UpdateJuly 27, 2020
In 2019, 87 employees – representing all but our smallest offices – served as local corporate responsibility advocates.