Signing a triple net lease for a medical office isn’t signing up to pay rent. It’s signing up to run part of a building. How much of it depends entirely on the lease language — and the range from a well-negotiated NNN to a landlord-favorable one can be tens of thousands of dollars a year, plus a six-figure surprise every time a major system fails.
This guide walks through what NNN and modified NNN leases typically obligate a medical practice tenant to maintain, repair, and replace; where the medical-specific gaps show up in generic commercial lease language; how to read your CAM reconciliation; and what to actually run as an operating program once the lease is signed. If you’re deciding whether to lease or buy in the first place, start there — this guide assumes you’ve decided to lease.
This isn’t legal advice. Lease terms vary widely, and your attorney should review any specific lease. What follows is the operational framework we see across medical practice leases in Florida and beyond.
What NNN Actually Means
“Triple net” refers to the three “nets” the tenant pays on top of base rent:
- Property taxes — pro-rata share of the building’s real estate taxes.
- Property insurance — pro-rata share of the landlord’s building insurance premium.
- Common area maintenance (CAM) — pro-rata share of maintaining the common areas of the property.
That’s the pass-through structure. It doesn’t automatically tell you who maintains what. That’s decided by separate clauses in the lease that assign responsibility for specific systems and areas.
The gradient of NNN structures usually looks like this:
- Modified gross — landlord pays most operating costs, tenant reimburses over a base year. Rare in medical.
- Modified NNN — some categories passed through, some absorbed by landlord. Common for smaller medical suites in multi-tenant buildings.
- Standard NNN — the three nets fully passed through, landlord responsible for structure/roof/major systems.
- Absolute NNN — tenant responsible for essentially everything including roof and structure. Common for single-tenant medical buildings.
The label on the lease matters less than what the specific clauses say. Two leases can both be called “NNN” and have wildly different maintenance obligations.
The Three Tiers of Building Responsibility
Every commercial lease sorts building elements into three practical tiers. Understanding which tier each element sits in — and who owns that tier under your specific lease — is the whole exercise.
Tier 1: Structure and shell. Foundation, exterior walls, roof structure, structural components. In a standard NNN, this is landlord’s responsibility. In an absolute NNN, it can shift to tenant.
Tier 2: Major building systems. HVAC, plumbing mains, electrical service and mains, fire and life safety, elevators. This is the gray zone where most negotiations happen. Common patterns:
- Landlord maintains and replaces (best for tenant)
- Landlord replaces, tenant maintains and repairs (very common in medical NNN)
- Tenant maintains, repairs, and replaces (landlord-favorable — this is where big surprises live, and the reason for a separate deep-dive on capping HVAC and capital obligations
- CAM pass-through for common systems, tenant direct for systems serving only the premises
Tier 3: Interior and premises. Everything inside your suite — interior walls, finishes, plumbing and electrical branching from the mains to your fixtures, your exam rooms, your operatories. This is almost always tenant responsibility in every lease structure.
Before you sign anything, know which tier each specific system is in under your specific lease. If you already signed and don’t know, that’s the audit to run before renewal.
The Systems Checklist
Here is the practical list. For each item: what the responsibility typically looks like in a standard medical NNN lease, and the specific clause language to read before you sign.
HVAC
The single biggest cost driver in most medical office leases. HVAC in a medical office is running long hours, meeting higher filtration and ventilation standards than general office space, and often on rooftop units exposed to Florida coastal conditions that shorten their life.
- Typical NNN allocation: Landlord maintains and replaces common HVAC serving multiple tenants; tenant maintains, repairs, and sometimes replaces HVAC serving only the premises.
- What to read carefully: whether “replace” is in your obligation, whether there’s a dollar or age cap, whether replacement cost is amortized over useful life, whether CAM includes HVAC capital costs.
- Real risk: a 15-year-old rooftop unit dies in year 2 of your 7-year lease and lands entirely on you at $30,000+.
Roof
- Typical NNN allocation: Landlord maintains and replaces in standard NNN; tenant responsible in absolute NNN. CAM often includes roof repairs but not full replacements — or does include replacements, depending on the CAM definition.
- What to read carefully: the distinction between “repair” and “replace,” the age of the current roof, remaining warranty, and whether roof leaks trigger business interruption on the landlord’s or the tenant’s side.
- Real risk: a partial roof leak becomes a full roof replacement conversation, and the CAM reconciliation next year includes a shocking capital line.
Plumbing
- Typical NNN allocation: Landlord maintains mains and risers; tenant maintains everything from the branch into the premises.
- What to read carefully: where the boundary is defined (sometimes at the wall, sometimes at the fixture), and who’s responsible for sewer-line issues below slab. Medical practices with operatories, exam sinks, autoclave rooms, and imaging equipment have significantly more plumbing than a general office tenant.
- Real risk: a slab leak under an operatory — is that landlord’s below-slab plumbing or tenant’s premises plumbing? Read the boundary language.
Electrical
- Typical NNN allocation: Landlord maintains service, transformer, and mains; tenant maintains panel(s) and everything downstream serving the premises.
- What to read carefully: whether the electrical panel serving your suite is a “tenant panel” or a shared panel, and who’s responsible for upgrades if your practice’s electrical demand grows.
- Real risk: a growing practice adds imaging equipment, laser equipment, or additional HVAC, and finds the existing service is insufficient. Upgrade cost allocation is a negotiation none of the parties saw coming.
Fire and life safety
- Typical NNN allocation: Landlord maintains building fire panel, sprinkler mains, and common-area life safety; tenant maintains devices within the premises and pays for inspections.
- What to read carefully: who pays for annual fire inspections, sprinkler head replacements in the premises, and fire panel monitoring.
- Real risk: deferred inspections that surface as fire marshal findings and force emergency repairs.
Elevators (if applicable)
- Typical NNN allocation: Landlord maintains and passes maintenance costs through CAM.
- What to read carefully: whether CAM includes elevator modernization (a capital event), not just routine maintenance.
Parking lot and exterior
- Typical NNN allocation: Landlord maintains and passes cost through CAM. Includes lot sweeping, patching, striping, and lighting; sometimes includes resurfacing.
- What to read carefully: resurfacing is a 20-year, five- or six-figure event. Is it in CAM, capped, or a separate reserve?
Landscaping and irrigation
- Typical NNN allocation: Landlord, through CAM.
Signage and exterior lighting
- Typical NNN allocation: Landlord maintains building signage and common lighting; tenant maintains suite signage.
- What to read carefully: signage rights, sign replacement standards, and whether the landlord has approval rights that could delay your practice’s rebrand.
Backflow prevention
- Typical NNN allocation: Usually tenant, especially for premises-specific backflow required by medical fixtures. Annual testing required in Florida by most water utilities.
Glass, doors, and hardware
- Typical NNN allocation: Tenant for premises; landlord for common areas and exterior building entries.
- What to read carefully: medical practices with automatic doors, ADA-compliant hardware, or specialty entries (lead-lined doors for imaging) — this can be a bigger obligation than a standard commercial suite.
Pest control
- Typical NNN allocation: Split — landlord for building perimeter, tenant for premises. Medical practices usually need higher-frequency pest control than general office.
Medical-Specific Systems Standard Leases Often Miss
This is where generic commercial leases leave you exposed. If your lease was drafted from a template that didn’t contemplate a medical tenant, you should specifically negotiate treatment of:
- Medical gas systems. Installed by tenant during buildout, maintained by tenant forever after. Medical gas work requires ASSE-qualified installers and verifiers; the lease shouldn’t treat this as “plumbing.”
- Backup generator. For refrigerated medications and vaccines, imaging equipment, or licensed facility life-safety branch requirements, a generator isn’t optional. If the building has one, who maintains and fuel-tests it, and who pays for replacement? If it doesn’t, can the tenant install one?
- X-ray and imaging equipment shielding. Lead-lined walls and lead-lined doors are tenant improvements. Replacement or modification when imaging equipment changes is tenant.
- Specialty exhaust systems. Dental amalgam separators, medspa laser plume evacuation, chemical fume hoods in dermatology or pathology. Usually tenant, often not addressed by name in the lease.
- Refrigeration for medications, vaccines, or specimens. Tenant equipment, but power reliability is a landlord issue when generator responsibility is unclear.
- Autoclave and sterilization equipment. Tenant, but sometimes with plumbing and electrical implications that touch mains.
- Compressor and vacuum systems (dental). Tenant. Often a compliance surprise when the standard NNN treats these as “utility equipment.”
Every one of these should be either explicitly named in the lease or covered under a general clause you understand. “Tenant is responsible for all equipment installed by tenant” is a starting point, but details matter — especially at replacement time.
Understanding Your CAM Pool
The CAM reconciliation is where the pass-through math actually happens each year, and it’s where landlord-favorable leases quietly become expensive. Before signing, and every year at reconciliation, you need clear answers on:
- What’s included. Landscaping, common-area utilities, roof and parking-lot maintenance, common HVAC, security, management fees, administrative fees — the list varies by lease. Ask for a three-year historical CAM breakdown before signing.
- What’s not included. Well-drafted leases exclude specific items from CAM: capital improvements over a threshold, replacement of major systems, penalties or fines from landlord violations, marketing costs, leasing commissions, landlord’s own overhead beyond a reasonable management fee.
- Management and administrative fees. Some leases pile a management fee on top of CAM plus an admin fee on top of that. Ten to fifteen percent is common; more is negotiable.
- Controllable vs. uncontrollable CAM. Controllable expenses (things the landlord can manage — landscaping, cleaning, management) can be capped at a percentage annual increase (5–7% common). Uncontrollable expenses (taxes, insurance, utilities) are usually not capped.
- Audit rights. Your lease should let you audit the CAM books once per year within a reasonable window. This is non-negotiable; without it, you have no way to verify.
CAM reconciliation abuse is common because most tenants don’t have the time or expertise to audit. In Florida medical office buildings, the biggest CAM surprises we’ve seen have been retroactive tax reassessments, capital line items that shouldn’t have been in CAM at all, and management fees compounding on themselves. An annual review of the reconciliation is real money.
Emergency Response and After-Hours
Most standard NNN leases don’t say much about response times. In medical, that gap matters.
- Landlord response obligation. How fast is the landlord obligated to respond to an emergency (a roof leak, an HVAC failure in July, a plumbing backup) that’s in the landlord’s scope? Many leases say nothing, which effectively means “whenever they get to it.”
- Tenant self-help. If the landlord doesn’t respond, does the lease give the tenant the right to make the repair and deduct from rent or bill the landlord? Without this, you’re stuck.
- After-hours access for landlord contractors. If the landlord’s HVAC contractor needs after-hours access, what’s the notice requirement, and how does that interact with your patient records and clinical spaces?
- Emergency contact list. Establish it in writing before you need it, and update it whenever anyone leaves.
For a medical practice, an unresolved HVAC failure isn’t a comfort issue — it’s a patient-care and staff-safety issue that can shut a clinic day down. The lease should give you real remedies, not just an obligation.
Medical-Specific Concerns
A few issues that don’t come up in a standard office lease and should be addressed in a medical one:
- Access to clinical space. Landlord contractors entering exam rooms, operatories, or areas with PHI need a defined access protocol. HIPAA doesn’t disappear because it’s the landlord’s plumber.
- Sterile-area protection. Any landlord work near sterile processing, an ASC OR, or a dental sterilization area needs coordination and containment. Standard “reasonable notice” language is not enough.
- Timing around patient hours. Landlord’s right to enter the premises should be constrained by your clinical schedule. Non-emergency work outside patient hours.
- Business interruption. If landlord work forces you to close a clinical space, what’s the tenant’s remedy? Rent abatement is common but not automatic — it has to be in the lease.
- Compliance-triggered work. If a landlord-scope item (roof, HVAC, plumbing) fails and causes a licensure or compliance finding for the tenant’s licensed facility, who bears the cost?
Documentation You Actually Need to Keep
Once the lease is signed and you’re running the space, the operating discipline that protects you looks like this:
- The lease and every amendment — accessible, searchable.
- Complete service records for every system in your obligation. Dates, vendors, invoices, findings, photos.
- Complete records of anything the landlord did in the building, especially work that touched or affected your systems.
- Every emergency and every response time — when you called, when the landlord responded, when the work was completed.
- Every CAM reconciliation and any correspondence disputing line items.
- Notices — everything either party formally noticed to the other.
The reason this documentation matters is that lease disputes almost always come down to who can prove what. A tenant with three years of documented HVAC service, dated invoices, and a service history log is in a fundamentally different negotiating position than one with a phone tree of past vendors and no records.
How MedServ Runs the Tenant Obligation
MedServ isn’t a lease negotiation firm — your attorney handles the lease itself. What the MedServ platform does is run everything that comes after the lease is signed: every system you’re responsible for under the lease is tracked as an asset with a PM cadence, a service history, and a documentation trail. Landlord-scope work that touches your premises is documented too — so when a dispute arises over who caused what or who owes what, the record exists.
For multi-location groups, we run this consistently across every leased and owned location, so the operations director has one view of every location’s obligations and status — not a stack of PDFs and a WhatsApp thread. When a lease renewal is coming up, the service history data becomes a real negotiating asset: “here’s what we spent maintaining your building last year” is a stronger position than “we’d like better terms.”
The lease defines what you’re responsible for. Running that responsibility well is where practices either build a defensible operation or accumulate risk. The platform is built for the running.
FAQ
What’s the difference between NNN and absolute NNN? Standard NNN passes through property taxes, insurance, and CAM, but the landlord still typically owns structure, roof, and major systems replacement. Absolute NNN pushes essentially everything — including roof and structure — to the tenant. Absolute NNN is common in single-tenant medical buildings, especially in build-to-suit deals.
Who is responsible for HVAC in a medical office NNN lease? It depends on the lease. Most standard medical NNN leases assign HVAC serving the premises to the tenant for maintenance and repair, with replacement either shared or landlord’s obligation. Landlord-favorable leases push replacement to the tenant too — which is why the age of the equipment at lease signing matters so much. See our upcoming deep-dive on capping HVAC obligations.
Can I audit my landlord’s CAM reconciliation? If your lease says so, yes. Most well-drafted leases include an audit right — typically one per year, within a defined window after reconciliation is delivered. If your lease doesn’t include this right, negotiate it in at renewal.
What if the landlord doesn’t respond to an emergency repair in their scope? Depends entirely on the self-help provision in your lease. Some leases give the tenant the right to make emergency repairs after notice and either deduct from rent or bill the landlord. Without that provision, your remedies are limited to notice-and-demand and, eventually, litigation. This is one of the most important clauses to negotiate.
What documentation should I keep as a medical tenant? Every lease amendment, every service record for systems in your obligation, every emergency incident and response, every CAM reconciliation and dispute, and every formal notice between tenant and landlord. Digital, searchable, and complete. This documentation is what supports your position in any lease dispute.
How often do NNN leases get renegotiated? Renewal is the natural moment, but any major building event (roof replacement, ownership change, major landlord-scope failure) is a legitimate reopening. Bringing hard data — service history, response times, CAM concerns — to a renewal negotiation is significantly more effective than bringing complaints.
Running the tenant side of an NNN? MedServ handles that.
If you’re signing, renewing, or already operating under a medical office NNN lease and want to actually run the tenant obligations as a program rather than as a series of reactions, schedule a walkthrough. We’ll review your current setup, service history, and lease obligations and show you what the platform would look like managing your program.
