How Do You Calculate the Real ROI of Buying Your Practice Building?

The real return on buying your practice building comes from four things, not one: the rent you stop paying a landlord, the loan principal you pay down each year, the building's change in value over time, and the tax treatment of ownership. A complete return calculation nets all four against what you put in — your down payment and your yearly carrying costs — rather than looking only at what the building might resell for. Most quick estimates miss the first two, and that is where much of the actual return tends to live. (The building also shapes how much the practice inside it can produce, which can be a larger question than the real estate's own return; this article treats that separately, below.)

The sections below walk through what each of those four sources is, what you have to subtract, and how the pieces come together into a single number you can compare against simply continuing to lease.

What does ROI mean for a practice building?

ROI — return on investment — is what you earn relative to what you put in. For a building, what you put in is mostly your down payment and the costs of carrying the building each year. What you earn is the combination of the four sources above.

It helps to separate two questions that often get blurred. The first is the one most owners ask: will the building be worth more later than I paid for it? That is about resale, and it is only one piece. The second is the fuller question: what is my total return from owning instead of continuing to lease? That one captures the rent you no longer hand to a landlord, the equity you build as you pay down the loan, and the tax treatment — none of which show up if you look at resale alone.

Owning produces a return through several channels at the same time. Counting only one of them understates what ownership actually does.

What are the four sources of return when you own your building?

1. The rent you stop paying

When you own, you no longer pay rent to a landlord. That avoided rent is a real return, not a side note — it is money that used to leave the practice every month and now does not.

A useful way to see whether that rent was a meaningful number is occupancy cost: the share of the practice's yearly collections that goes toward rent and facility costs. In owner-occupied dental and medical practices, a healthy occupancy cost generally runs in the range of 5 to 8 percent of collections. If your practice was paying toward the upper end of that band in rent, ownership is redirecting a real slice of revenue back into an asset you control.

2. The principal you pay down (building equity)

Each loan payment is split between interest and principal. The principal portion converts debt into ownership — that is called amortization, and it quietly builds equity in the building every month, whether or not the building's market value moves at all. By the time the loan is paid off, you own the building outright, and that accumulated equity is part of your return even if the building never appreciated a dollar.

3. The building's change in value (appreciation)

Over the years you hold the building, its value may rise. This is the source most people think of first, but it is the least certain of the four and should not carry the whole case on its own. Underlying rents and building values in a given market tend to drift gradually — often only a couple percent a year — rather than swinging suddenly. Treat appreciation as a plausible addition to your return, not the foundation of it.

4. The tax treatment of ownership

Owning commercial real estate carries tax treatment that leasing does not — depreciation being the main one, with cost segregation as a related, more specialized topic. These can be real components of return, but how much they are worth depends entirely on your specific tax situation, and they are a CPA's domain, not a real estate advisor's. The honest way to treat this category is to know it exists and may add to your return, and to size it with your accountant rather than assume a number.

What costs do you net against those returns?

A return is what is left after costs, so the four sources above only mean something once you subtract what ownership requires:

• The capital you tie up. Your down payment is money that is now in the building and not somewhere else — in the practice, in investments, in paying down other debt. The return that capital could have earned elsewhere is its opportunity cost, and it is a real cost of owning even though no check is written for it. The counterweight is that the capital is not gone: it becomes equity in the building that earns its own return through the sources above. So the honest way to weigh it is the capital's alternative return against the return it earns as building equity — and what rate to assume for that alternative is a question for your financial advisor.
• Debt service. Your loan payment replaces your old rent payment. Sometimes it is higher, sometimes lower; either way it is the new outflow to compare against the rent you used to pay.
• The costs a landlord used to carry. As owner, you now cover property taxes, insurance, maintenance, and repairs — costs that may have been the landlord's before.

The point of netting these out is simple: a building can rise in value and still be a weak investment if the carrying costs are high enough. ROI is the net of the four returns minus these costs — not the headline resale gain.

How does the building affect the practice's capacity?

The four sources above measure the building's return as a standalone asset — what the real estate earns and what it is worth. But a building does something a spreadsheet of rent and appreciation does not capture: it sets the ceiling on what the practice inside it can produce.

Layout, size, operatory or exam-room count, and patient flow all shape how much a practice can do. A building that fits the practice's direction can make room to add a provider, run more chairs, or extend hours within the space already there — production that may require little or no additional facility cost. A building that does not fit can quietly cap production no matter how favorable the purchase or the lease looks on paper.

For many owners, this can be a larger question than the building's own return as an asset. A purchase that pencils out modestly on rent, equity, and appreciation can look different once the building's effect on what the practice can produce is considered. That effect is specific to each practice and each building, it depends on the owner's own goals, and it is a separate analysis from the return calculation in this article. The point worth carrying away here is that the building is not just an asset that may appreciate — it is the space the practice has to grow into, or doesn't.

A worked example

Take a 3,000-square-foot dental building priced at $300 per square foot — $900,000.

One thing that anchors a building like this is the cost to build out the clinical space inside it. Dental build-out is among the most expensive in commercial real estate — currently about $180 to $200 per square foot, versus roughly $80 to $100 per square foot for standard professional office space. On 3,000 square feet, that is $540,000 to $600,000 of clinical build-out a buyer would have to replicate, against $240,000 to $300,000 for generic office. A buyer who walks away from a dental building and builds out plain office space instead does not save the difference — they pay it again in construction, plus months of delay. That replacement cost is part of why a purpose-built dental building holds value.

For the financing, this example uses a conventional commercial loan: 20 percent down ($180,000) on a $720,000 loan at an illustrative 7.5 percent over 25 years. (Practice owners often have a lower-down-payment path as well — SBA-guaranteed loans can require as little as 10 percent down — but the conventional structure is the more conservative basis for an example, and rates vary, so treat 7.5 percent as a placeholder for whatever you can actually borrow at.) That works out to roughly $63,850 a year in loan payments. Assume the owner holds for 20 years.

Now the ownership return, source by source:

• Rent you stop paying: at a market rent in the range of $23.50 to $27.50 per square foot for dental space in a secondary market, this 3,000-square-foot building represents roughly $70,500 to $82,500 a year that was leaving the practice as rent. Notice that the loan payment of about $63,850 is in the same neighborhood as the rent the practice would otherwise pay — except this payment is buying the building rather than a landlord's.
• Principal paydown: over the 20-year hold, the principal portion of those payments pays down roughly $454,000 of the loan. Added to the $180,000 down payment, the owner holds about $634,000 in equity at year 20 — before counting any appreciation at all. (On a 25-year loan held 20 years, a balance of around $266,000 remains; the equity figure is the down payment plus what has been paid down, not a free-and-clear building.)
• Appreciation: over 20 years, assuming the gradual market drift described above, the building's value may rise as well — but this is the least certain source, so the case does not lean on it. Anything here is on top of the $634,000 in equity already built.
• Tax treatment: real, but sized with your CPA, not estimated here.

Against those returns, net out the opportunity cost of the $180,000 down payment, the loan payments (set against the rent the practice would otherwise pay), and the property taxes, insurance, and upkeep the owner now carries. What remains is the real return — and the striking part is how much of it is already there in the rent no longer paid and the $634,000 of equity built, before appreciation enters the picture at all. That is the return most quick estimates miss when they look only at resale.

What is the building worth to the next buyer?

Your eventual resale value is not arbitrary. A real estate buyer values an income-producing building largely on two things: the rent it produces and the cap rate they apply to that rent. A cap rate is the annual return a buyer expects on the purchase price — a lower cap rate means a higher price, a higher cap rate means a lower price. The building's value is roughly its net operating income divided by that cap rate.

For an independent, owner-occupied practice building with a single tenant on a personal guarantee, cap rates generally fall in a range around 7.5 to 8.5 percent, with smaller buildings (under 5,000 square feet) often landing toward the higher end of that range. The structure of the lease in place — how long it runs, who guarantees it, how it is written — can move where a building lands within and beyond that range. None of this is a prediction of what any particular appraiser will conclude; it is the general mechanics of how income-producing buildings are priced.

When does buying not produce a good return?

Ownership is not automatically the better choice, and an honest calculation will sometimes say so. Buying tends to produce a weak return when:

• The remaining career horizon is short. Much of ownership's return — principal paydown especially — accrues over years. A short hold leaves little time for it to build.
• The practice revenue cannot comfortably support the building. If rent at the purchase price would push occupancy cost well above the healthy band, the building is priced beyond what the practice underneath it can sustain.
• The location is weak. A building in a declining or hard-to-re-lease location carries more resale risk and may not hold value.
• The purchase is over-leveraged. A thin down payment and heavy debt service can erase the rent-savings advantage and leave little margin for the costs ownership brings.

Running the numbers is what tells you which situation you are in. The same calculation that makes the case for owning is the one that, in these cases, makes the case against it.

The point of running it first

The full return on owning your practice building is knowable before you commit — not as a single guess about resale, but as the sum of rent you stop paying, equity you build, value that may accrue, and tax treatment your CPA can size, netted against what ownership costs you. That is the calculation worth running before a purchase, while there is still room to decide, rather than after.

NextSite Consulting is an independent, fee-based real estate advisory firm for dental and medical practice owners. We help owners model decisions like this one — what the real estate is worth and what it would return. We work on a flat-fee basis. This article is general information, not tax or legal advice; the tax treatment of ownership in particular should be sized with your CPA.