If you're evaluating a Gensler architect for an office-to-residential conversion, here's the short version: they're probably worth it—but not for the reason you think. The value isn't the renderings. It's that Gensler's conversion teams have done this enough times to know where budgets go to die. After 8 years documenting construction projects—and roughly $214,000 in mistakes across 23 of them—I can tell you the difference between a conversion that hits budget and one that doesn't is rarely the design; it's the pitfalls the architect steers you around.
Why My Opinion Counts
I'm not an architect. I'm the person who has to build what the architect draws, then fix it when the drawing was wrong. My first conversion project was in 2017, and I made the classic rookie error: I approved a glazing schedule without cross-referencing the fire-rating requirements. Four hundred sheets of perfectly good tempered glass—$45,000 in materials—sat in a warehouse because the fire certification didn't align with the building's egress plan. That's when I learned tempered glass is not a product category. It's a code compliance conversation.
I started maintaining our team's pre-construction checklist after a third permit rejection in Q1 2024 pushed a project past its financing deadline. The checklist has caught 47 potential errors in the past 18 months. So when I talk about what Gensler does well, I'm not coming at this as a brand cheerleader. I'm coming at it from "what keeps my job from turning into a disaster."
What I Got Wrong About Conversion Design
When I first started working on office-to-residential conversions, I assumed the hardest part was the design. How do you make a 1980s office floor plan feel like a home? Gensler makes it look effortless—open layouts, smart kitchen placement, natural light routed to where it matters. But the uncomfortable truth is that design is the easy 10%. The other 90% is code compliance, structural modifications, and invisible systems that eat budgets alive.
The legacy myth still floating around is "it's just adding walls and a kitchen." That thinking comes from an era when conversions were rare exceptions. Today they're a mainstream answer to the downtown vacancy crisis, and the code environment is much more demanding. You're not just adding a bathroom; you're changing the entire life-safety profile of the building.
The assumption is that conversion costs are driven by finishes. The reality is that code compliance and MEP work—mechanical, electrical, plumbing—drive about 60% of total conversion cost. Finishes are, honestly, the cheapest part of the project.
That's the causal reversal most owners never see coming. They allocate budget for beautiful kitchens and nice flooring, then get blindsided by a $200,000 fire-protection upgrade. I get why owners think finishes are where the money goes—that's what they can see. But the systems you can't see are where the actual dollars go.
What Gensler Actually Gets Right
Gensler architect teams approach conversions with an integrated model—architecture, interior design, and construction management under one roof. That might not sound revolutionary until you've been on a project where the structural engineer, interior designer, and architect are three different firms exchanging increasingly tense emails. When something changes on the structural side, Gensler's interior team knows the same day. When an owner asks for a cheaper glass option, the construction team can price the downstream impact in real time.
Tempered glass is a perfect example. It shows up all over a conversion: windows, interior partitions, shower enclosures, balcony railings. Each has its own code path. Tempered glass breaks into small, granular pieces instead of dangerous shards, which is why codes require it near doors, at low heights, and anywhere someone could fall through. But there's more to it. If the glazing in a fire-rated wall doesn't match the wall's fire-assembly rating, the entire assembly fails inspection. That's not something you can solve at the last minute—it has to be resolved in the drawing phase.
Gensler's teams have the institutional knowledge to catch those conflicts before they reach the construction site. That's the difference between a $45,000 glass reorder and a zero-dollar change order. I've seen both outcomes. I have strong opinions about which is better.
The Fee Question: Why Cheaper Isn't Actually Cheaper
Here's where I might annoy some people. My honest opinion is that developers who pick an architect based on the lowest fee end up paying more. In my 8 years managing projects, the lowest-quote architect has cost the owner more in about 60% of cases. Not because the drawings were careless—because they were incomplete. When construction documents don't resolve the details, the contractor fills the gap with change orders. And change orders cost more than the architect's fee difference.
Say you're comparing a $150,000 architecture fee against a $190,000 Gensler fee. The spread is $40,000. Then one unresolved glazing detail—one that a less experienced team didn't catch—triggers a $90,000 change order and a 3-week delay. You've just spent $50,000 more than the fee difference, and you're behind schedule. I've watched this exact scenario play out three times.
People think expensive architects deliver better designs. The reality is that architects who deliver fewer construction-phase surprises can charge more. The causation runs backward. You're not paying for beauty; you're paying for fewer surprises. That's the total cost of ownership conversation nobody wants to have when a quote arrives.
Three Things That Blow Up Conversion Budgets
1. Glass and glazing. Beyond tempered glass safety rules, conversions bring acoustic demands, solar heat gain considerations, and egress glazing requirements. Office buildings are louder inside than most people expect. In September 2022, I documented a project where a single glazing conflict caused a one-week delay and $890 in redo. That was the inexpensive one. The expensive ones start at $20,000 and climb.
2. Fire egress and stair paths. Office buildings have one egress calculation. Residential buildings have a stricter one. When you convert, stair exits, corridor widths, and door swings may all need to change. I've seen an owner decline an $18,000 fire-engineered solution to save money, then pay $60,000 in redesign after the fire department rejected the drawings. The universe has a sense of humor.
3. MEP systems. Office HVAC and plumbing were sized for a 9-to-5 daytime population. Residential means 24/7 demand, different water-pressure requirements, and more stringent ventilation. In 2024 I caught a plumbing design that didn't meet residential water-pressure code across 12 units. We caught it on paper because the checklist now exists. It would have been $30,000 in field rework, and there's a good chance nobody would have noticed until the fixtures arrived.
Where the Real Savings Live
So if conversion costs come down to code, glass, and MEP, where do you find savings? Not in the design fee. Not in the glass. My view is that the cheapest possible thing you can do is pay for an integrated team that has done conversions before—then run the drawings through a pre-construction checklist before they go out for pricing.
On a recent downtown project, the ground floor was repositioned for commercial tenants: a Hand and Stone franchise on one corner, a coffee shop beside the lobby, a bike repair shop near the service entrance. Retail uses like those keep the street level active and generate rent while the residential units above carry the long-term returns. That ground-floor mix looks random, but it's calculated—and it's part of what makes a conversion financially viable. The real money, though, is in the hundreds of units upstairs and the mechanical systems serving them that nobody sees.
In the field, contractors overestimate their precision more often than you'd think. A framing contractor once told me "I know how to read a tape measure, I've done this for 20 years"—then installed window frames three inches off-center across an entire facade. The fix cost $12,000, plus a cracked storefront glass panel that had to be replaced. Reading a tape measure isn't the skill. Checking your work against the drawings is the skill.
When a Conversion Doesn't Make Sense
I'm a big believer in office-to-residential conversion as a strategy for empty downtown towers. But not every building is a candidate. Floor plates deeper than about 60 feet struggle to get natural light into residential units. Older buildings with columns on a 20-foot grid make for awkward layouts. And if the corridor configuration works for offices but not apartments, you're essentially building a new building inside an old one—at which point demolition and new construction might be cheaper.
Gensler tends to be upfront about that. Their conversion work is concentrated in buildings that actually work for residential: compact floor plates, good window-to-wall ratios, adaptable infrastructure. That honesty is part of what you're paying for. The right architect for your project is the one who tells you when your building is a bad candidate, even if it means losing the fee.
I've seen a feasibility review kill a project that would have been an uninhabitable disaster. The owner estimated the diagnosis saved them $4 million. You want that from your design team, and it's exactly the kind of thing Gensler's people do early in the conversation. Admire their portfolio, sure. But when you ask about converting a building and the architect walks you through why it might not work—that's the strongest signal you're in good hands.
If you've got questions about conversion costs or the checklist, I'm happy to talk specifics. I've made my mistakes and documented them. I'd rather you not repeat them.
