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Don&#8217;t get screwed.</text><text x="58" y="258" font-family="Arial,Helvetica,sans-serif" font-size="30" font-weight="600" fill="#6b5b4d">Leases, TI, NNN &amp; buildouts — negotiated in your favor</text><g transform="translate(1010,86)" fill="none" stroke="#C0531F" stroke-width="9" stroke-linejoin="round"><rect x="20" y="40" width="150" height="130"/><line x1="20" y1="40" x2="95" y2="6"/><line x1="170" y1="40" x2="95" y2="6"/><rect x="50" y="80" width="36" height="36"/><rect x="104" y="80" width="36" height="36"/><rect x="74" y="128" width="42" height="42"/></g></svg>

How Do I Budget an Office-to-Medical (or Other) Conversion Buildout?

Direct Answer

Convert your expectations first, then the space: an office-to-medical buildout is not a fancy office fit-out — it's a different building code, and the budget reflects it. Plan on $150–$400+ per square foot for a medical conversion, versus $75–$200 per square foot for standard office, with the premium driven by added plumbing, dedicated HVAC and exhaust, electrical capacity, ADA, and the code jump from business occupancy (Group B) to, in some cases, institutional occupancy (Group I-2) for surgical or overnight use.

The single biggest money move is to vet the base building before you sign the lease, because medical loads can break an office shell: you need adequate water and sanitary capacity for exam-room sinks and sterilization, HVAC tonnage and dedicated exhaust for procedure rooms, electrical capacity for imaging equipment, and a floor that can carry it.

A landlord's generous-looking TI allowance of $40–$80 per square foot barely dents a $300-per-square-foot medical buildout, so the screw-job to avoid is assuming the allowance covers a conversion — it covers a fraction, and you fund the rest. Get a medical-experienced architect and MEP engineer to do a feasibility study before lease execution (a few thousand dollars that can save you six figures), and negotiate the landlord to deliver base-building upgrades — power, water, structural — as their cost, not yours.

The cheapest medical conversion is the one in a building that was already close.

Why a Conversion Costs Far More Than an Office Fit-Out

A conversion changes the *use* of the space, which triggers code, system, and structural requirements an office never had. The cost drivers, roughly in order of impact for medical:

• Plumbing explosion. Medical means sinks in every exam room, sterilization areas, lab drains, and sometimes medical-gas piping. Plumbing can run 2–4x an office's, and relocating wet program away from the existing stack compounds it.
• HVAC and exhaust. Procedure and exam rooms often need dedicated air handling, higher air-change rates, and isolated exhaust — far beyond standard office comfort cooling. This is frequently the single biggest premium line.
• Electrical capacity. Imaging, sterilizers, and equipment loads can require a service upgrade the office shell never anticipated — $20,000–$150,000+ depending on scope.
• Occupancy change and life-safety. Moving from Group B office occupancy toward medical or institutional use can trigger sprinkler upgrades, fire-rated separations, additional exits, and ADA compliance throughout.
• Structural. Heavy equipment (imaging, dental, lab) may exceed the floor's design load, requiring reinforcement.

The same logic applies to any change-of-use conversion — restaurant, fitness, lab, childcare — each carries its own code package. You're not redecorating; you're re-permitting the building's purpose, and the budget has to carry that weight.

Build the Budget From the Code Up, Not the Finishes Down

Most people budget a buildout by picturing the finishes. For a conversion, that's backwards — start with the code-driven systems, because that's where the money is. A defensible medical conversion budget, by category:

1. Demolition and prep — $5–$15 per square foot to strip the office shell.
2. Plumbing — the conversion premium starts here; exam-room sinks, lab/sterilization, and waste can add $20–$60 per square foot over office.
3. HVAC and exhaust — dedicated air handling and procedure-room exhaust commonly add $25–$75 per square foot.
4. Electrical — devices, equipment circuits, and any service upgrade, $15–$50 per square foot plus upgrade cost.
5. Architectural / partitions / doors / ADA — exam rooms, corridors at code width, accessible restrooms, $30–$80 per square foot.
6. Specialty — lead shielding for imaging, medical gas, casework, highly variable by program.
7. Permits, design fees, and soft costs — 15–25% of hard costs.
8. Contingency — 10–15%; conversions hide surprises behind every wall.

Add it up and the $150–$400 per square foot range makes sense. The exact number depends almost entirely on how close the base building already is — which is why feasibility comes first.

Vet the Base Building BEFORE You Sign

This is the step that separates a budgeted conversion from a financial disaster. Before lease execution, get a medical-experienced architect and MEP engineer to assess:

• Water and sanitary capacity — can the existing service and stacks handle the added fixtures, or do you need a new tap and bigger mains?
• HVAC capacity and exhaust routing — is there tonnage to add, and a path to route dedicated exhaust to the roof?
• Electrical service — amperage headroom for medical equipment, or an expensive upgrade?
• Structure — floor load capacity for heavy equipment.
• Zoning and occupancy — is medical use even permitted, and what occupancy classification will the work trigger?

A feasibility study costs roughly $3,000–$15,000 and is the highest-leverage spend in the whole project. It tells you the real conversion cost before you're committed, and it arms you to negotiate. A space that's already close to medical-ready might cost half what a bare office shell does — feasibility is how you tell them apart before you sign.

Make the Landlord Carry the Base-Building Costs

A conversion gives you real negotiating angles, because much of the heavy cost is base-building infrastructure the landlord arguably should provide. Push for:

• Base-building upgrades as landlord cost. New utility service, structural reinforcement, and core system capacity benefit the building and the landlord long term. Negotiate these as the landlord's expense or a separate landlord-funded scope, not your TI.
• A realistic TI allowance — and don't be fooled by it. A $40–$80 per square foot allowance is generous for office and a fraction of a $300-per-square-foot medical job. Know that going in; the allowance offsets, it doesn't cover.
• Free rent for the long buildout. Conversions take longer to permit and build; negotiate enough free-rent/fixturing period to cover the real schedule, and tie the rent clock to utility availability and substantial completion.
• Removal/restoration relief. Don't agree to rip out a six-figure medical buildout at lease end — strike or cap the restoration clause.

The principle: systems that stay with the building should be the landlord's cost; program-specific work that walks with you is yours. Drawing that line correctly is worth tens of thousands.

FAQ

How much does an office-to-medical conversion cost per square foot? Plan on $150–$400+ per square foot, versus $75–$200 for standard office. The premium comes from added plumbing, dedicated HVAC and exhaust, electrical capacity for equipment, ADA, and the occupancy-class jump from business (Group B) toward medical or institutional use.

The exact number depends on how close the base building already is.

Why is a conversion so much more expensive than an office fit-out? Because it changes the building's *use*, triggering code, system, and structural requirements an office never had — exam-room plumbing, procedure-room exhaust, equipment electrical loads, life-safety upgrades, and sometimes floor reinforcement.

You're re-permitting the building's purpose, not just refreshing finishes, and the budget has to carry that.

Will the landlord's TI allowance cover a medical conversion? No. A typical $40–$80 per square foot allowance is generous for office but only a fraction of a $150–$400-per-square-foot medical job. Treat the allowance as an offset, not full funding, and negotiate base-building infrastructure upgrades — utility service, structure, core systems — as the landlord's separate cost.

What should I check before signing a lease for a conversion? Get a medical-experienced architect and MEP engineer to run a feasibility study before lease execution — about $3,000–$15,000 — covering water/sanitary capacity, HVAC and exhaust routing, electrical service headroom, structural floor load, and whether the use is even zoned and permitted.

It reveals the real conversion cost while you can still negotiate or walk.

Does this apply to other conversions like restaurant or fitness? Yes. Any change-of-use — restaurant, fitness, lab, childcare — carries its own code package and base-building demands (grease and venting for food, water and locker plumbing for fitness, and so on). Budget from the code up, run a pre-lease feasibility study, and split base-building cost (landlord) from program-specific cost (tenant) the same way.

Sources

• RSMeans (Gordian) — Commercial and medical construction unit cost data by occupancy type.
• CBRE — Healthcare and medical-office fit-out cost guides.
• JLL — Healthcare Real Estate and Construction Outlook conversion-cost analysis.
• Cushman & Wakefield — Healthcare Advisory and tenant project services briefs.
• NAIOP (Commercial Real Estate Development Association) — Change-of-use and conversion feasibility research.
• BOMA International — Occupancy, base-building systems, and tenant work standards.
• International Code Council (ICC) — Occupancy classification (Group B vs. I-2) and change-of-use code requirements.
• AGC (Associated General Contractors) — Construction cost, soft-cost, and contingency benchmarking.