Both doctors in a small clinic building are past sixty, and the lease has eight years left with two five-year options.

The underwriting here is solid. The assumption you named, option exercise contingent on physician longevity, is the right one to stress.

Two things worth adding.

First, assignment language cuts both ways. If the lease permits assignment to an acquiring health system, that sounds like protection, but a system that absorbs the practice and already owns or leases preferred space will often wind down the acquired location within the assignment period rather than renew. So assignment rights without a use covenant or continuous-operation clause can give you a tenant change without giving you occupancy continuity. Confirm what the assignment clause actually requires the assignee to do, and whether the options survive an assignment.

Second, the specialized build-out is doing work in your exit math that deserves explicit attention. Medical office space with clinical infrastructure, plumbing for exam rooms, medical gas lines, specific electrical capacity, is expensive to refit for a general-office or flex tenant. If you are underwriting a year-eight exit to a non-medical buyer, the cap rate spread to stabilized clinical is wider than most conservative models assume, and the re-tenanting cost is a line item, not a footnote. Your vacant medical office exit cap should probably carry a TI allowance assumption large enough to attract a replacement clinical tenant, because that is the bid the next buyer will be pricing against you.

On the system acquisition conversation question: that disclosure is material and a seller who has had those conversations and has not surfaced them is a problem. Whether that rises to the level of a representation you need in the PSA is a question for your real estate attorney.

What does the rent schedule look like inside the base term? Flat, stepped, or CPI-linked matters a lot if you end up holding through a non-renewal.

The cap rate conversation is where I'd push back. People underwrite vacant medical office at general commercial vacancy comps, and that is wrong in a way that costs you real money. In Cleveland we picked up a single-tenant medical building in 2022 where the occupant retired mid-lease, and getting it re-tenanted took 22 months and $140k in TI because medical office has very specific buildout requirements that most replacement tenants will not absorb without heavy landlord contribution. The plumbing runs, the oxygen lines, the sink counts per room, the ADA clearances in every exam bay, a general office user cannot just walk in, and a new medical tenant negotiates hard on TI precisely because they know you have limited alternatives. Your exit cap on a vacant medical building is not just higher, the retenanting cost is a second hit that has to live in the model separately.

What nobody has actually put a number on is what "wide enough" means on the going-in cap. For a two-doc practice with no visible succession and eight years of hard term left, I would want at least 150 to 200 basis points over the market rate for a stabilized multi-tenant medical building in the same submarket, specifically to carry the vacant retenanting scenario without going underwater. And I'd want to know the square footage, because if this is a 4,000 square foot single-tenant box, your retenanting pool is narrower than a 10,000 foot building where you can split the space. What's the square footage and is the buildout single-tenant or does it have any chance of being divided?

The assignment clause question is the right one, but I'd go further and ask whether the lease was even drafted with a practice sale scenario in mind, because a lot of these older MOB leases were written when physician employment by health systems was rarer and the language just doesn't contemplate it. I've seen assignment provisions that technically require landlord consent but then define consent as not unreasonably withheld, which sounds protective until the system acquiring the practice is a creditworthy tenant and a judge decides you had no reasonable basis to withhold. You end up with Ascension or CommonSpirit on your rent roll instead of two individuals, which is either a windfall or a problem depending on whether they want to stay in that specific location.

What I haven't seen anybody price is the TI exposure if this goes vacant at year eight. Medical office retrofit for a new clinical tenant isn't a paint-and-carpet number. Depending on what specialty these two are in, you could be looking at plumbing runs, electrical for imaging, HVAC zoning, ADA compliance on exam rooms if the build-out is old enough. I gutted a 1958 ranch in Lakewood and found out the hard way that what looks like a clean shell is never a clean shell. Medical space that's been occupied by two physicians for fifteen or twenty years has been modified incrementally in ways that don't show up on the as-built drawings. What's the current build-out vintage, and did the seller pull permits on any of the modifications during the tenancy?

The options are not the risk; the lease itself is.

If either physician retires at 68 or 69 rather than 70, you lose the final year or two of the base term, and a half-vacant medical office building reprices faster than most sellers model. The going-in cap needs to carry the full weight of a vacant-at-expiration exit, and the spread between stabilized clinical and vacant medical in most secondary markets is 150 to 250 basis points, which on a $4M building is a $600K to $1M swing in exit value before you account for re-tenanting costs, which for medical buildout run $80 to $120 per square foot even for a second-generation space.

The question nobody has asked is what the lease says about continuous operation. A surprising number of medical office leases have no continuous operation clause, which means a physician can stop seeing patients, keep paying rent through year eight, and hand back a space that has been dark long enough that any specialized plumbing, gas lines, or imaging infrastructure has degraded. The rent stream stays intact on paper while the re-tenanting cost climbs.

Does the lease obligate continuous operation, and does it define what happens to the tenant's improvements if the space goes dark before expiration?

What's the square footage and does it have procedure rooms or imaging built out?

What's the lease structure on operating expenses, and does it shift at all if headcount in the practice drops below a threshold?

I ask because I've seen gross or modified gross leases on small clinic buildings that were written around two full-time providers, and when one retired mid-term the remaining doctor renegotiated hard on the basis that he was now carrying the whole NNN burden alone even though it was technically a gross lease. Landlord had no leverage because a half-vacant medical suite is a very specific relet problem. The exit cap at year eight on a single aging physician is already painful, but getting there with two years of reduced effective rent is worse.

The disability or death of one physician likely terminates the lease if the practice dissolves, and most small-practice leases have exactly that language buried in the force majeure or impossibility clause.

A co-tenancy clause cutting rent if one physician exits would change the whole income picture before you even reach the option question.

Say the building is 8,000 square feet at $25 net, so $200,000 annual income. If one doctor retires at year six and a co-tenancy provision drops rent 40 percent, you are collecting $120,000 into year seven while also trying to re-tenant half the space, and vacant medical office re-leases slowly because the next user almost always needs a TI package to reconfigure the clinical layout. That gap eats the exit cap cushion you thought you had going in.

The assignment language matters here in a specific direction: system acquisitions typically bring a new entity as assignee, and whether the lease requires landlord consent to assign, and whether consent can be withheld or only conditioned, determines whether a hospital system can walk into a building you own on terms you never negotiated. Some medical office leases written for small practices are silent on this, which cuts both ways, you might get a creditworthy system tenant without negotiating for it, or the practice dissolves rather than assigns and you get nothing.

Does the lease define "tenant" as the professional corporation or the individual physicians by name, because that distinction alone tells you whether a system acquisition is an assignment event or a termination event?

The eight-year base term is the asset, and the options are a story you tell a lender.

Say the building trades at a 7 cap on $200k net operating income, so $2.86M. If both physicians retire at lease end and you re-lease to a single-specialty group after 18 months of vacancy and a $150k tenant improvement allowance, your exit net operating income drops to maybe $160k while the new buyer prices vacant-adjacent medical office at a 9 cap, so roughly $1.78M. That is a $1.08M swing on a building where the going-in story was "eight years of stable income plus options." The options did not fail you, the underwriting that priced them as probable did.

The piece nobody above touched is the rent-to-revenue ratio for the practice itself. Medical office tenants with thin margins or high billing concentration in one physician are fragile before the lease ever expires. If one doctor accounts for 70 percent of the patient volume and that doctor is 64, the practice could functionally hollow out two or three years before the base term ends, which means you are negotiating a blend-and-extend from a weak position while the tenant is still technically current on rent.

What does the lease say about subletting to another medical use, and is that right assignable without landlord consent?

What's the specialty, because a primary care practice and a surgical subspecialty have completely different acquisition profiles right now.

Systems are buying up procedural specialties fast, and if either of these two does anything in a procedure suite the "system acquisition conversation" question is not hypothetical, it is probably already happening. Eight years of income looks different if one of them does colonoscopies or injections and a regional health system has been on a buying spree in that metro.

What's the replacement tenant universe for this building if it goes dark at year eight? That's what actually sets your exit cap, not comps on occupied MOB.

I bought into a two-tenant professional building in Westlake thinking the lease tail was the story, and it was until one tenant retired fourteen months early and the other followed inside a year. Retenanted at a 40% rent reduction because the space needed reconfiguration and I had no leverage.

Has either physician structured their practice as an LLC or PC with multiple members, because that's a different animal than a pure two-doc partnership with no bench?

What is the specialty, because a general practitioner and a cardiologist with owned imaging equipment exit very differently?

The number I want is the annual rent relative to what the building would lease for vacant to a new medical tenant, because that spread is what you are actually buying. If the in-place rent is at or below current market, a vacancy at year eight is painful but not catastrophic, since a replacement tenant sees fair terms from day one. If the rent has been growing with escalators for eight years and is now 20 percent above market, the re-leasing story requires a concession package that compresses your exit proceeds exactly when the buyer pool is already thin on a single-tenant medical building with an unproven successor. The practice sale scenario the original post flags is real, but the direction of that rent gap determines whether it is a pricing problem or a structural one. What is the current rent per square foot against asking rates for comparable medical office in that submarket?

Eight years of income is real, but the exit is what you are actually buying.

Say the building costs $1.2 million at a 7 percent going-in cap, so net operating income runs about $84,000 a year. If both physicians retire at lease end and the building sits vacant for twelve months while you find a new tenant, and the next buyer underwrites vacant medical office at a 9 percent cap on stabilized income that now requires a tenant improvement allowance of $60 a foot on 4,000 square feet, you have spent $240,000 in TI before you get to carrying costs. That exit value compresses fast. The spread between a 7 percent acquisition cap and a 9 percent exit cap on a building that needs re-tenanting is not a rounding error, it erases a material portion of the return even if every rent check arrives on time during the hold.

The point nobody has made explicit yet is that medical office re-tenancy is slower than general office re-tenancy, not faster. A physician group or surgery center needs plumbing, gas lines, specific electrical load, and in many cases a certificate of occupancy review before they can open. The physical plant that makes this building valuable to the current tenants is also what makes it expensive to adapt for the next ones if their specialty differs. A building wired and plumbed for two internists does not drop into use by a physical therapy group or an imaging center without capital.

So the going-in cap has to price the re-tenanting scenario as probable, and the hold period return has to survive on the cash flow alone, treating the options as a gift if they materialize rather than a column in the base case. What is the current lease structure on capital expenditures, specifically who carries the cost if a major system fails in year six?

What's the specialty? A primary care or family practice duo is a very different succession story than two surgeons who need a specific procedure suite, because the latter is almost impossible to backfill without gut rehab money. The physical plant question and the tenant question are the same question in medical office.

What specialty are they in?

Eight years sounds like a runway until you remember that physician retirement does not announce itself on a schedule. I sold a storage facility in 2022 and even that exit took two years of prep once I decided I was done, and storage operators don't have a Medicare credentialing file to wind down. The market you're buying in changes this calculus a lot, because in a mid-size metro a vacated two-suite clinic gets absorbed, but in a smaller community that building sits until someone redevelops it or a rural health system takes pity on it at a discount. What I'd want pulled is the rent per square foot against current market for medical office in that specific submarket, because if these physicians negotiated a 2018 deal they might be sitting at a rate a replacement tenant won't touch without a full TI package, and that TI cost is yours. The going-in yield has to fund a potential re-tenanting in year eight or the math is flattering itself.

The risk that hasn't come up yet is the financing exit, specifically what a lender prices this as at year six or seven when you go to refinance or sell. A buyer's lender at that point sees two tenants in their late sixties with a lease that expires inside a standard five-year loan term, and they underwrite it as transitional, not stabilized. That compresses the loan-to-value they will extend, which either forces your buyer to bring more equity or kills the deal at a price that makes your return math work. You can hold through the base term and still get repriced at the point of disposition because the financing the next buyer can get has deteriorated even if the tenants are still practicing.

The other thing worth sitting with is what the building does physically if these two wind down. Specialist medical office, procedure rooms, plumbing for exam space, the layout assumptions baked into the buildout, all of that was designed around a specific clinical workflow. If the successor tenant is a general practitioner or a therapy group, the re-tenanting cost is meaningful and the downtime between clinical tenants in a two-doctor building tends to run longer than a standard office vacancy because the pool of single-tenant absorbers for that footprint is thin. So the going-in yield needs to carry not just a terminal cap haircut but a realistic re-tenanting cost line, probably twelve to eighteen months of lost income and a tenant improvement allowance that reflections a near-full reconfiguration. What is the building's square footage, and is it a single-suite configuration or does it have any divisibility if you need to attract two smaller tenants instead of one replacement?

What's the asking price modeled against, stabilized rents or actual in-place?

Because if the seller is pricing to the options, that's a seven-figure bet on two 62-year-olds staying healthy and motivated past 70. I'd want to see the last three years of gross collections from the practice, because a declining revenue trend is the earliest signal that one of them is already winding down patient load before they say anything publicly.

The piece nobody has priced yet is the physical asset itself. Medical office built around two specific practitioners tends to have procedure rooms, lead shielding, gas lines, or plumbing configurations that a general office tenant cannot use and a replacement clinical tenant may not want without a significant TI package. If the build-out is highly physician-specific, the re-tenanting cost at year eight is not just lost rent during a vacancy gap, it is also a six-figure conversion bill that belongs in the exit model today.

Take a 6,000 square foot building. If re-tenanting a general medical suite runs $60 a foot for a new clinical tenant, that is $360,000 coming off the resale value before the buyer even applies their exit cap. At a 7.5 cap on stabilized NOI, that $360,000 in deferred capital erodes roughly $4.8 million of gross value by about 7.5 percent. The going-in cap has to be wide enough to hold that number.

What does the current build-out actually look like, and has anyone pulled a cost estimate on what conversion to a more generic medical suite would run?

Does either doctor own any interest in the building, because that changes the retirement calculus completely. A physician-owner sells the real estate as part of exit, a pure tenant just hands back keys.

The system acquisition point deserves more weight than it's getting. A hospital or large group that buys the practice almost never keeps an independent lease in a building it doesn't control, they relocate to their own campus within the first renewal cycle, which means those options effectively disappear the moment a LOI gets signed somewhere else.

The build-out is the hidden liability: medical office improvements are so tenant-specific that re-leasing vacant clinical space often costs more than a year of rent.

Billing trend is the number I haven't seen anyone pull in these threads and it's the right one. A practice that's already slowing down shows up there before it shows up anywhere the broker hands you.

Has the seller said anything about system acquisition conversations?