TI Projects Don't Wait.Neither Do We.
Tenant improvement is detail-driven work. You're not touching the primary structure — you're adapting to it. Every decision lives at the connection level: anchors, edge-of-slab conditions, hidden supports that aren't on any drawing.
The stakes are real. Miss the smallest detail and there's nothing below you to fix it. That's what brings a structural engineer onto a TI project — not just stairs and partitions, but the certainty that someone with deep expertise caught everything before it reached the field.
The devil isn't in the structure. It's in the connections.
WE'RE NOT JUST ENGINEERS.
WE GET IT DONE.
We don't stall.
We pick up the phone, clear roadblocks, and move. We know that TI work isn't linear and we thrive in the swirl of decisions, deadlines, and drawings.
We speak architect.
Our clients say we feel like part of their office. We collaborate like design partners, not just consultants.
We build trust.
Project managers bring us in because they've worked with us before and know we'll protect their reputation.
We reduce friction.
We've been in your buildings, we know your systems, and we know how to avoid rework. Owners call us back.
Over 95% of our work is repeat business.
For a reason.
400+ projects.
Every detail matters.
From Apple Store staircases to Downtown LA high-rises — a selection of what we've delivered.
Herald Examiner Building
Los Angeles, CA
1888 Century Park East
Century City, CA
Mayer Brown LLP
Los Angeles, CA
City National Plaza
Los Angeles, CA
Walt Disney Studios
Burbank, CA
Apple Store Staircases
Multiple Locations, CA
The North Face Flagship
Beverly Hills, CA
Hercules Campus
Playa Vista, CA
Working on a TI project?
We're typically available to kick off within the week.
Bring us your tight timelines, tangled gridlines, your last-minute stair.
TI projects completed
across California
repeat business rate
clients come back
years of expertise
Nabih Youssef & Associates
TI projects per year, 1988–2026
* 2026 year in progress — 10 projects completed to date.
Project breakdown by sector
Based on 400+ TI projects delivered since 1979. Every number above is a building we already know.
Speed and responsiveness. You need someone on-call, fast turnaround, ready at kickoff.
We pick up. Every time.
Familiarity and relationship. You want the engineer who already knows your building — no transition cost, no rework.
We've probably already been in your building.
Zero margin for error. Your reputation is on the line if this goes wrong.
We're the safe hands your team will thank you for.
Signature Staircases
When design asks for the impossible, we make it structural reality.
Things that drive a structural engineer onto a TI project are usually stairs. We've engineered glass treads for Apple retail, dramatic steel cantilevers in occupied towers, and code-compliant feature stairs that architects actually want to show clients.
- Complex stair design in occupied high-rise towers
- Structural glass treads and cantilevered steel
- Fast feasibility feedback for in-field decisions
Including Apple Store glass staircases across multiple California locations.
Lobby Renovations
Lobby work is where design ambition meets real-world constraints.
It's visible, high-stakes, and full of structural surprises. Building owners call us because we know their aging high-rise frames. We make bold ideas possible without disrupting operations—or triggering major structural upgrades.
- Seamless structure for creative rebrands
- Integration of new entries, stairs, and ceilings
- Deep knowledge of aging high-rise structural frames
High-Rise TI
When the job's 30 stories up, you need an engineer who moves.
Active tenants, tight schedules, complex structural grids—this is where we thrive. We handle high-rise TI projects every week. From load transfer analysis to field RFI response in hours, not days.
- Complex load transfer in constrained structural grids
- Rapid field RFI response and design support
- Multi-floor scope and rollout coordination
Fast-Turn Fit-Outs
We know you don't get a month to think about it.
Our team is built for velocity. We produce clean, clear deliverables that let the build move forward—partition layouts, ceiling support, slab penetrations. Final picture and documents ready in a week.
- Lightning-fast partition and ceiling structural support
- Lean drawings that answer field questions directly
- Flexibility to scale with multi-floor rollout
The Invisible Details
In TI, the devil isn't in the structure. It's in the connections.
TI work lives at the detail level — anchors, edge conditions, hidden supports that architects can't see and GCs can't invent. We've built our reputation on catching what others miss before it becomes a field problem.
- Anchors, edge-of-slab conditions, and hidden structural supports
- Retrofit strategies that avoid triggering major code upgrades
- Coordination with architectural intent at every connection point
We speak your language. On deadline.
Architects want responsive engineers — professional, available, and on call. They don't need creativity from their SE. They need someone who will be on top of a fast project and turn around deliverables fast. That's us. Our clients say we feel like part of their office.
“They pick up the phone. Every time. And they actually understand what we’re trying to design.”
— Principal Architect, Interior Design Studio
- Fast turnaround on feasibility studies
- Clear, architect-readable drawings
- Available for field visits same week
We know your building. We protect your investment.
Owners want familiarity, low risk, and controlled cost. We've been in hundreds of California high-rises. We know how aging structures behave. When you call us for a lobby renovation or tenant fit-out, you're calling a team that already understands what you're working with.
“We’ve used NYA on four different floors of this building. They know our structure better than our own records do.”
— VP of Property Operations, Century City
- No surprises — we know existing conditions
- Avoid triggering major structural upgrades
- Peer review services available
Your reputation is on the line. Ours too.
Property managers carry the risk when a contractor underperforms. We understand that. We've worked alongside building management teams for decades — we're the name they bring to architects because they know we won't create problems, we'll solve them.
“With NYA, I know the project won’t blow up in my face. That’s not a small thing when you’re managing 40 floors of active tenants.”
— Senior Property Manager, Downtown Los Angeles
- Familiarity with your building systems and records
- Competence that protects your standing with ownership
- No logistics headwind — easy entry, clean execution
NYA is the team you want on speed dial. They move fast, communicate clearly, and never leave you guessing.
