Buy vs. Lease Your Dental Office: The Financial Analysis

Most dentists lease their office space. A minority own it — and over a 20-year career, that decision often represents $500,000 or more in net worth difference. It's not a guaranteed win either way: the wrong purchase in the wrong market at the wrong stage of your career can tie up capital you needed elsewhere. But most dentists who should be buying aren't, because they've never run the actual numbers.

This guide walks through the SBA 504 financing structure, the holding entity rules, what cost segregation does for a dental buildout under the current OBBBA 100% bonus depreciation rules, and the specific situations where ownership is clearly the right call versus where leasing wins.

Why dental office real estate is a different decision than regular commercial real estate

Dental offices are specialized construction. Compressed air lines, nitrous delivery, vacuum systems, lead-lined walls for imaging, high-amperage circuits for CBCT and sterilization — these aren't features a general commercial tenant needs. That specialization creates both an opportunity and a constraint:

• Opportunity: The SBA treats dental offices as owner-occupied commercial real estate, making them eligible for SBA 504 financing with rates and terms that are typically better than conventional commercial mortgages. Your practice occupancy justifies the loan.
• Constraint: Dental-specific buildouts have limited re-use value for non-dental tenants. If you're 45 and planning to sell the practice at 60, your real estate exit strategy needs to account for a narrower buyer pool than a general office building.

The second thing that's different: the decision is linked to your practice exit. When you eventually sell the practice, the real estate is a separate transaction — sometimes a significant benefit, sometimes a complication that kills deals if not structured correctly from the start.

True cost of leasing a dental office

Dental office leases are rarely simple gross leases. You're typically signing a triple-net (NNN) or modified-gross lease where you pay base rent plus a share of the building's property taxes, insurance, and maintenance (called CAM — common area maintenance).

What the monthly payment doesn't show you:

• Annual rent escalators: Most dental leases have 2–3% annual escalation clauses. On a $12,000/month base, 3% compounding means you're paying ~$16,100/month in year 10 and ~$21,600/month in year 20. Over 20 years, escalation alone adds roughly $500,000 in total rent paid versus flat rent.
• CAM fees: Typically $3–$8/sq ft annually in addition to base rent. On a 2,000 sq ft practice, that's $6,000–$16,000/year extra — and CAM reconciliations often produce surprise bills in year one.
• Personal guarantee: Most landlords require a personal guarantee for the lease term, which means your personal assets are at risk if the practice closes. Some landlords will cap this with a "good guy clause" (guarantee ends when you vacate and pay back rent), but dental office landlords often push back harder than in general commercial because of the limited tenant pool.
• Tenant improvement allowance (TIA): The landlord may offer $50–$100/sq ft in TI money for a new buildout or refresh. This sounds generous but comes with conditions: the TI is amortized into your rent (you're paying it back), and ownership of the improvements typically reverts to the landlord at lease end.
• Renewal risk at practice sale: When a buyer is evaluating your practice, they're also evaluating the lease. A lease with 2 years left that hasn't been renewed is a red flag that depresses your purchase price. Landlords know this and can use the renewal as leverage.

SBA 504 financing for dental office purchases

The SBA 504 loan is the financing structure most dental office buyers use. It's designed specifically for owner-occupied commercial real estate, and the terms are materially better than conventional commercial mortgages.

The 504 structure has three layers:¹

The CDC debenture rate is fixed for the full 20- or 25-year term — a meaningful advantage over conventional commercial mortgages that reset every 5–7 years. If rates rise after you close, you're unaffected on 40% of your financing.

Example — $1.5M total project (purchase + buildout):

• Bank first mortgage: $750,000 (50%)
• CDC debenture: $600,000 (40%)
• Your equity: $225,000 (15%)
• Combined monthly payment on $1.35M financed at blended ~6%: approximately $9,700–$10,200/month depending on bank terms

That payment often compares favorably to NNN lease costs in the same building once you include CAM, escalation, and the compounding effect over time.

The holding entity structure

Never take title to your dental office in the same entity as your practice. The standard structure is:

• Practice entity (PC or S-corp): operates the dental practice, pays fair market rent to the real estate LLC
• Separate real estate LLC: holds title to the property, receives rent, handles depreciation and mortgage

Two reasons this matters:

Asset protection: Dental malpractice claims, equipment liens, and practice-level liabilities cannot reach property held in a separate entity. Keeping them combined is an avoidable risk.

Clean practice sale: When you sell the practice, buyers (including DSOs) are acquiring the goodwill and patient base — not the real estate. If they're combined, the buyer has to either acquire both (which changes their underwriting) or you have to unwind the structure at an inopportune time. Separate from day one gives you maximum flexibility at exit: sell the practice, lease back the building to the buyer, sell the building separately, or retain it as an income property.

One structural detail to understand: under IRS rules, rental income from property you lease to a business you materially participate in is treated as non-passive income (the "self-rental rule," Reg. §1.469-2(f)(6)). This means the rental income from your LLC won't shelter passive losses from other sources — but it also means you can't lose money on a rental that flows to your own practice on paper. For most dentists, this is a non-issue because the rental is modestly profitable and the real tax benefits come from depreciation, not phantom losses.

Tax advantages: depreciation and cost segregation

Owning commercial real estate gives you depreciation deductions you don't get as a lessee. For a dental office, the combination of straight-line depreciation and cost segregation under the current OBBBA rules is particularly powerful.

Straight-line depreciation on the building structure

The IRS requires non-residential real property to be depreciated over 39 years using the straight-line method.² On a $1.2M building (excluding land, which is not depreciable), that's approximately $30,800 per year in depreciation expense — a real deduction that reduces your taxable income from the rental activity without a cash outflow.

Cost segregation + 100% bonus depreciation

Here's where dental offices have a structural advantage over general commercial properties: a high fraction of a dental buildout consists of components that don't need to be depreciated over 39 years. Dental-specific plumbing systems, specialized electrical, equipment pads, cabinet millwork, and decorative finishes can often be reclassified as 5-year, 7-year, or 15-year property through a cost segregation study.

Under the OBBBA (signed July 2025), 100% bonus depreciation is permanently restored for property placed in service after January 19, 2025, per IRS Notice 2026-11.³ This means any property reclassified to a shorter life under a cost segregation study can be fully deducted in year one — not spread over 5, 7, or 15 years.

Example — $1.5M dental office project:

• Total project cost: $1,500,000
• Land (not depreciable): $200,000
• Depreciable building basis: $1,300,000
• Components reclassified by cost segregation study (dental plumbing, electrical, equipment infrastructure): approximately $350,000–$450,000
• Year-1 bonus depreciation on reclassified components: $350,000–$450,000 (100% immediate deduction)
• At a 37% marginal rate, that's $130,000–$167,000 in first-year federal tax savings
• Cost of the study: $8,000–$15,000⁴

This doesn't eliminate tax permanently — it's an acceleration. Depreciation recapture applies at sale. But the time value of that deferral, particularly early in a 20-year hold, is substantial. And if you hold the property until death, the cost basis steps up and the recapture disappears entirely.

How real estate ownership affects your practice sale

This is where dentists are most likely to be surprised — in both directions.

Potential upside:

• You can negotiate a long-term lease with the practice buyer as a condition of sale. If the buyer is a DSO acquiring multiple practices, a stable lease with predictable terms at market rate is often worth a premium on the practice price.
• You retain a cash-flowing asset after the practice sale — potentially $8,000–$15,000/month in rental income from the new practice owner — without the clinical demands.

Potential complexity:

• Buyers who want a clean acquisition (practice + real estate in one) will be buying two assets with different financing structures. Asset allocation between goodwill and real estate affects their tax basis, and some PE-backed DSOs aren't set up to own real estate operationally. Expect a more complex closing.
• If the building is specialized enough that only a dental tenant can use it, your pool of real estate buyers is narrow. Price your expectations accordingly.

Dental office condos

In some markets, dental office condos are a middle path. Rather than owning an entire freestanding building, you purchase a single unit in a multi-tenant medical or dental office building. The structure is similar to a residential condo: you own your unit outright, share common areas, and pay HOA fees that cover exterior maintenance, parking, and shared infrastructure.

Dental office condos work well for solo dentists in urban or suburban markets where freestanding buildings are expensive or unavailable. The trade-offs:

• Pros: Lower purchase price than a standalone building; no roof/HVAC/parking lot maintenance responsibility; often in medical-professional buildings with built-in referral relationships; resale pool limited to dental/medical buyers (similar to standalone) but familiar product in major metros.
• Cons: HOA fees reduce operating economics; less control over building aesthetics, signage, and tenant mix; if neighboring tenants turn over, the environment changes. Also verify that the condo documents permit dental use including X-ray equipment and hazardous materials disposal — some buildings have restrictions.

When buying makes financial sense — and when it doesn't

What a financial advisor models in this decision

A dental-specific financial advisor looking at the buy vs. lease decision will typically model:

• Present value of 20-year lease cash flows (with escalation and CAM assumptions) vs. after-tax ownership cost (mortgage P&I minus depreciation tax shield)
• Cost segregation opportunity sizing (what fraction of the total project qualifies for accelerated depreciation given the specific buildout)
• Cash flow impact on retirement contributions — does the extra debt service crowd out your solo 401(k) + cash balance plan contributions for 3–5 years?
• Exit scenario modeling — what happens to the real estate in each of your three most likely exit paths (DSO sale, associate buyout, wind-down)
• Entity structure and self-rental income treatment in the context of your overall tax position

This is a different analysis than what your commercial real estate broker will run. The broker models purchase price and lease rate. The financial advisor models 20-year after-tax net worth outcomes.