Dental office lease guide: space, terms and the clauses that matter

A dental lease is not an apartment lease with a bigger number. You are about to spend several hundred thousand dollars improving a building you do not own, then pay rent on it for ten years or more. The landlord's lawyer wrote the first draft. This guide walks through the space, the money and the clauses in the order you will meet them, so you walk into the letter of intent knowing your number.

One note before we start. I'm a budget planner, not a broker, an attorney or a contractor. Nothing here is legal advice, and I won't tell you what to sign. What I can do is show you which terms move your budget, so you know what to ask your attorney and your broker about.

What kinds of space work for a dental office?

Almost any commercial space can become a dental office if the plumbing, power, zoning and access work. In practice, most dentists end up choosing among five types. Each one trades visibility, build-out cost and control differently.

Second-generation space deserves a careful look, not an automatic yes. One contractor estimates that previously medical or dental space can cost 30-50% less to build out (Terrapin Construction Group, 2026), but that depends on how much of the old suite you can actually reuse. A suite that needs every wall moved is first-generation space with a higher rent.

How much space should you lease?

Size the space from your operatory count, and size the operatory count from the production you plan to reach. Don't let the available suite decide it. The Alithos estimator uses these planning assumptions for total suite area, which includes the reception, sterilization, lab, staff and private office spaces that support the operatories:

These are planning math, not a quote. The $170 rate is the model's lease standard finish and $220 is lease premium. Both sit inside the $150-$350 per sq ft range a 2026 dental-lawyer guide publishes for leasehold build-outs (Dental & Medical Counsel, 2026). On top of construction, the model adds cabinetry at 10% and soft costs (design, engineering, permits) at 12% of construction. So a 4-op standard suite carries about $340,000 of construction, $34,000 of cabinetry and $40,800 of soft costs: roughly $415,000 tied to the space itself before a single chair arrives.

Two habits help. First, plan for the operatories you'll need in year five, and decide whether to plumb the extras now. Running water and drains to a future op during the build-out usually costs far less than cutting the slab later. Second, don't lease much more than you need "just in case." Every extra square foot carries rent, CAM and build-out for the whole term.

For the full reasoning, read how many operatories and square feet you actually need, or try the operatory square footage calculator.

What are rentable and usable square feet?

Usable square feet is the space inside your suite that you occupy and build out. Rentable square feet is your usable area plus your share of the building's common areas: lobbies, shared corridors, common restrooms, mechanical and electrical rooms. Rent is usually quoted on rentable square feet.

The ratio between the two is the load factor (also called the add-on factor or R/U ratio). If a suite has 2,000 usable sq ft and the building's load factor is 1.15, you pay rent on 2,300 rentable sq ft. Single-tenant buildings may have little or no load factor. Multi-tenant medical buildings with large lobbies have more.

Many office landlords measure with the BOMA standard published by the Building Owners and Managers Association, now in its 2024 edition (ANSI/BOMA Z65.1-2024). Its stated purpose is a clear, comparable method for measuring rentable area. Two practical points follow:

• Ask which measurement standard and which edition the landlord used. Different editions can produce different numbers for the same suite.
• Ask for the usable area as well as the rentable area, in writing, with a floor plan. Your architect can check the usable figure. Some tenants negotiate a remeasurement right, or a cap on the load factor for the term.

Here is why it matters. Take a hypothetical 2,000 usable sq ft suite at $25 per rentable sq ft per year. At a 1.15 load factor, the rent is on 2,300 sq ft: $57,500 a year instead of $50,000. That $7,500 gap is $75,000 across a ten-year term before any escalation. Your build-out budget, on the other hand, follows usable square feet. The estimator's square footage is the space you build, so if a landlord quotes rentable area, the number on the lease will be larger than the number in your plan.

What is the difference between NNN, modified gross and gross leases?

The labels describe who pays the building's operating costs: property taxes, insurance and common-area maintenance. The labels are loose. Two "modified gross" leases can split costs in completely different ways, so read the expense section, not the name.

To compare offers, convert every one into an all-in annual occupancy cost: base rent plus expected pass-throughs, multiplied by rentable square feet, plus your own utilities. A $24 NNN offer and a $32 full-service offer may be closer than they look.

For market context, JLL reported that medical office occupancy hit a record 92.7% in the fourth quarter of 2025, with national average medical office rents in the mid-$20s per square foot per year and new developments leasing at over $40 (JLL, 2026). Those are national averages across lease structures. Your market and your building may be very different, which is why I treat a broker's local survey of comparable deals as part of the budget, not a nice extra.

What are CAM charges and how are they reconciled?

CAM stands for common area maintenance. It is your pro rata share of the cost of running the shared parts of the property: landscaping, parking-lot sweeping and lighting, common-area cleaning, security, snow removal, management fees and repairs. In an NNN lease you usually pay a monthly estimate. After year-end, the landlord compares the estimate with actual costs and sends a reconciliation: a bill if costs ran over, a credit if they ran under.

Your share is normally your rentable square feet divided by the building's or center's rentable square feet. Check the denominator. If it only counts leased space instead of the whole building, you pay more when the building is half empty.

Three terms do most of the work in a CAM clause:

• Caps. A cap limits how much controllable CAM can rise each year. Ask whether it is cumulative or non-cumulative, and which costs are "controllable." Taxes, insurance and utilities are usually excluded from caps.
• Audit rights. The right to review the landlord's books for a given year, within a set window after you receive the reconciliation. Ask who pays for the audit and what happens if overcharges are found.
• Exclusions. A list of costs that can never be passed through. Common requests include capital improvements (or only their amortized share), costs to lease other space, leasing commissions, the landlord's financing costs, repairs covered by insurance or warranties, and management fees above a stated percentage.

For your budget, carry CAM as a separate line from base rent and assume it rises. If you are reviewing a lease for a practice relocation, compare the new building's history of reconciliations with your current one. CAM is one of several costs that rarely show up in a first estimate. The others are in the hidden costs that ambush dental office projects.

What goes in a letter of intent?

The letter of intent (LOI) is a short, mostly non-binding summary of the business deal. It matters more than its length suggests. The LOI is where the money terms get set, and once a term is agreed in the LOI, the landlord treats it as settled. The lease draft that follows is built on it. That is why I want a budget done before the LOI, not after.

A dental LOI should at least address:

• Premises: suite number, usable and rentable square feet, measurement standard, and a floor plan exhibit.
• Term: length, commencement date, and the date rent starts (they are often different).
• Renewal options: number and length of options, and how renewal rent is set.
• Base rent and annual escalations, in dollars per rentable sq ft per year.
• Lease type and the current estimate of NNN or pass-through costs, with recent history.
• TI allowance: dollars per sq ft, what it can be spent on, and how and when it is paid.
• Rent abatement: free rent during the build-out and early ramp, if negotiated.
• Landlord's work and delivery condition: what the landlord builds or repairs before handing over the space.
• Permitted use and exclusive use language.
• Assignment and subletting, including transfer on the sale of the practice.
• Personal guarantee terms, if any.
• Utility capacity: water, drains, electrical service, HVAC, and space for compressor and vacuum equipment.
• Signage rights on the building, monument or pylon.
• Parking ratio and any reserved spaces.
• Contingencies: permits, financing, and landlord approval of your plans.
• Who pays brokers, and confirmation that the LOI is non-binding except for any confidentiality or exclusivity terms.

Not every item will be resolved in the LOI. But every item you leave out becomes a negotiation later, when you have less leverage and the landlord's lawyer is drafting. Have your attorney review the LOI before you sign it, even though it is "non-binding."

Which lease clauses matter most for a dentist?

A dental practice is a heavy, immobile tenant. You put plumbing in the slab and lead in the walls, and patients learn your address. That makes some ordinary lease clauses far more important to you than to an accounting firm next door. These are the ones I look at first when I build a budget around a lease.

Two of these can surprise people. On escalations: a hypothetical $50,000 first-year rent with a 3% annual escalator totals about $573,000 over ten years, not $500,000. On restoration: removing plumbing, cabinetry and shielding from a dental suite is real demolition work. If the clause is vague, it is a cost you may pay twice, once to build and once to remove.

Should you lease, buy a condo or build?

Leasing is the lowest-capital path, and for many first offices it is the right one. Buying a medical condo builds equity and removes renewal risk, but adds a down payment, association dues and less freedom to move. Building ground-up gives you control and the most expensive project by far.

The Alithos model shows the gap. For a 5-operatory standard office, the lease path comes to about $933,500 all-in (a $887K-$980K planning range), while the ground-up path is about $1,452,000 (a $1,379K-$1,525K range) before you buy land. The difference is mostly construction: $170 per sq ft for a leased build-out against $340 for ground-up at standard finish. You can see the full table on the Alithos cost benchmark.

The question is not which building you like best. It's which path's monthly cost your production can support. That three-path comparison is laid out in build, lease or condo: run the numbers first. If you're leaning toward owning, start with the guide to building a dental office.

How do you negotiate the TI allowance?

The tenant improvement (TI) allowance is the landlord's contribution to your build-out, usually quoted per square foot. It is often the single largest number you negotiate. Published ranges for medical and dental tenants run from roughly $40 to $100 or more per square foot and vary widely by market, term and building (Terrapin Construction Group, 2026). I could not find a primary survey of dental TI allowances, so treat any range as a starting point for your broker's local research.

Measure the allowance against your real build-out cost. On the model's 4-op standard suite, construction alone is $340,000 on 2,000 sq ft. A $40 allowance covers $80,000 of that, and a $100 allowance covers $200,000. On 2,400 sq ft, the gap between $25 and $70 per sq ft of TI is $108,000. That gap has to be funded some other way, usually by a bigger loan or more of your own cash.

TI trades against rent, term and free rent. A higher allowance usually means a longer term or a higher rate. Some landlords offer "amortized" TI that you repay through rent with interest, which is a loan inside your lease; compare its rate with your bank's. The details, and the clauses that claw TI back, are in tenant improvement allowances: negotiating the landlord's money. To test a specific offer, use the TI allowance calculator.

What about zoning, change of use and the certificate of occupancy?

A space being available does not mean a dental office is allowed in it. Three local approvals stand between a signed lease and an open door:

1. Zoning. The city's zoning code says which uses are permitted on that parcel. Medical and dental offices are allowed in many commercial zones, but not all, and some require a conditional or special use permit with a public hearing.
2. Change of use or occupancy. If the space was last used as retail, a restaurant or a warehouse, converting it to a dental office can trigger a change of use or occupancy review. That can bring requirements for parking, restrooms, fire separation and accessibility.
3. Building permit and certificate of occupancy (CO). Your build-out needs a permit, and the city issues a certificate of occupancy (or final sign-off) before you can see patients.

Cities say this plainly. The City of Dana Point, California, for example, says a certificate of occupancy is required when the use or occupancy type changes or when tenant improvements need a building permit, and it strongly advises confirming with the city that your use is permitted before signing a lease, including a check with the Planning Division (City of Dana Point, Certificate of Occupancy). Rules differ by city and county, so call your own planning and building departments before the LOI.

Accessibility is part of the same check. Under the federal ADA rules for public accommodations, the elevator exemption for small buildings does not apply to the professional office of a health care provider. When you alter a primary function area, the path of travel to it generally must be made accessible too, unless the cost is disproportionate, which the rules define as more than 20% of the cost of the alteration (U.S. Department of Justice, 2010 ADA Standards). In plain terms: a second-floor suite with no elevator, or an old building with a non-compliant entrance and restrooms, can add real cost. Your architect and the building department tell you what applies. State and local codes, including California's, can add requirements of their own.

Put the answers in the lease. Ask for a contingency that lets you walk away if you cannot get permits for dental use, and make clear who pays for code upgrades to the building outside your suite.

Do you need a tenant-rep broker?

Usually, yes. A good tenant-representation broker knows which landlords are motivated, what comparable deals actually closed at, and what concessions are normal in your market. That local knowledge is hard to get any other way.

Understand how they are paid. A tenant-rep broker is usually paid a commission when the lease is signed, most often by the landlord or out of the landlord's leasing commission. The service feels free to you, but it is priced into the deal, and the broker is paid when a lease gets signed, not when you walk away from a bad one. That doesn't make brokers dishonest. It means you should know the incentive.

• Ask for the commission arrangement in writing, including who pays it and how it is calculated.
• Ask whether the broker or their firm also represents landlords, and whether they represent the landlord of any building they show you.
• Ask for examples of dental or medical leases they have negotiated, and talk to those tenants if you can.
• Give the broker your budget limits, from your own plan, before the first tour.

I'm not a broker. I'm paid by my client alone, and I take no commissions, referral fees or kickbacks from brokers, lenders, dealers or contractors. My role sits next to the broker's: I build the budget that tells you how much rent, TI and term your practice can carry, so the broker negotiates against a number you trust.

When should you start looking for dental office space?

I recommend starting the space search at least 12 months before you need keys. Finding a suite, negotiating an LOI and lease, designing, permitting and building all take time, and each step can slip. In a market where JLL reports record medical office occupancy (JLL, 2026), good suites don't wait.

The deeper reason is leverage. Leverage belongs to whoever is not out of time. If your current lease ends in 60 days, or your loan commitment expires, the landlord knows you can't walk away. A dentist with a second option and a budget in hand negotiates very differently.

A sensible order looks like this:

1. Know your number. Model the project from operatory count, finish level and financing, before you tour. The Alithos cost estimator gives a first pass.
2. Define the space. Square footage, utilities, parking, visibility and the zoning you need.
3. Search with a broker. Tour against your criteria and check zoning on every serious candidate.
4. Negotiate the LOI. Rent, TI, term, abatement, use and assignment, reviewed by your attorney.
5. Negotiate the lease. Your attorney leads. Check every money term against your budget.
6. Design, permit and build. With contingencies in the lease so a permit delay doesn't start your rent.

For the full startup sequence, from first numbers to opening day, see how to open a dental practice. For what the build-out itself costs line by line, see the dental office build-out cost guide.

Where does an independent budget fit?

Every term in this guide turns into a number: rent per year, CAM, the escalator, the TI gap, the cost of restoration. The point of a budget before the LOI is to see all of them at once, against what your practice can support.

That's the work I do. The Feasibility Check ($2,500 flat, credited toward the Budget Plan) is a go / no-go screen on space and site fit, a high-level equipment budget range and a debt-service coverage pre-check. The Budget Plan ($7,500-$10,000 flat fee, scope set in writing before work starts) adds space requirements, a line-item equipment and imaging budget, build vs. lease vs. condo projections and a lender-ready package. For owner-side advisory through opening, including independent quote review, the Project Navigator starts from $20,000 and is quoted per project; availability depends on your project's state and is confirmed before engagement.

The free 30-minute Project Fit Call is the place to start if you're looking at space now. Unfamiliar terms are defined in the dental office project glossary, and the other pillar guides are in the guides library.

Dental office lease FAQ

Sources

1. Building Owners and Managers Association (BOMA) International, BOMA 2024 for Office Buildings: Standard Methods of Measurement, ANSI/BOMA Z65.1-2024 (2024). standards.boma.org
2. U.S. Department of Justice, 2010 ADA Standards for Accessible Design, including 28 CFR 36.401(d), 36.403 and 36.404 (2010). ada.gov
3. City of Dana Point, California, Permit Center, Certificate of Occupancy (accessed 2026). danapoint.org
4. JLL, Medical outpatient buildings ready for active 2026 despite policy headwinds (2026). jll.com
5. Dental & Medical Counsel (A. Oromchian), A Dental Lawyer's Guide to Your Dental Office Build-Out (2026). dmcounsel.com
6. Terrapin Construction Group, Medical Office Tenant Improvement Cost Per Square Foot (2026; contractor publication). terrapincg.com
7. Alithos Advisory, cost estimator and benchmark table, planning assumptions (2026). alithos.co/#benchmark

Rent, load factor and escalation examples on this page are hypothetical arithmetic for illustration, not market data or a quote.

This guide is general education about commercial leasing for dental offices, not legal, tax or real estate advice. How we research and update this page.

For a first pass, run the cost estimator before you tour a single suite. When you want the lease terms tested against your own production, book a free Project Fit Call.