Vacancy is a perishable good
Unlike canned beans, steel or lightbulbs, rentable space is a perishable good—every day an office space sits unleased is revenue that is gone forever. If you don't rent space out this month, you can't simply sell it twice next month to catch up. Leasing velocity isn't a luxury, but a financial imperative with a compounding cost.
Rather than leasing a raw shell and waiting for a tenant to design and fund their own fit-out, many landlords choose to make the capital investment upfront and offer the space ready to occupy. These speculative units, called Spec suites or Cat A+, lease dramatically faster than one requiring a tenant to fund and manage their own buildout. Months of vacancy become weeks and as a bonus, tenants are willing to pay a premium for immediacy and certainty.
But traditional leasing has its own logic. A longer lease means fewer turnover events, fewer vacancy gaps, lower operational overhead, and simpler asset management. And you don't lose any leasable area to circulation space.
Both options look compelling. But which one is right?
One big machine or many smaller ones
Think of leasing strategy like a capital planning decision—as if you're deciding what factory equipment to install, because in essence, that is exactly what you are doing.
Traditional leasing is one large machine. Expensive to commission, slow to install, but once it's running it produces steady output for a decade with minimal intervention. One tenant, one long lease, one rare but significant turnover event at the end.
Spec suites are many smaller, replaceable machines. Each unit is faster to bring online, generates higher output per square foot, and turns over more frequently. The floor has more moving parts—more tenants, more lease events, more operational overhead. But it also has redundancy: one vacancy doesn't take the whole floor offline. When one unit turns, the others keep running.
This is a well-understood trade-off in manufacturing. One large press or a bank of smaller ones. The answer always depends on the same variables: your operating window, your cost of capital, your tolerance for downtime, and how honestly you've modelled the full maintenance cycle.
Traditional leasing versus spec suites is the same capital planning decision manufacturers have been making for decades. The tool to compare them properly exists—it just hasn't been needed in leasing before. Until operating lifespans diverged, a single lease cycle was a reasonable proxy for the full comparison.
But over what analysis period?
The natural instinct when comparing two investment options is to reach for a standard metric. Net Present Value (NPV), Net Operating Income (NOI), or Net Effective Rent (NER) — each one feels like it should settle the question.
But each requires a choice about ignoring one factor — and that's where this comparison gets complicated. How long do you run the model? A 10-year traditional lease will generate a higher NPV than a 3-year spec suite lease almost by definition — there are simply more cash flows to discount. Choose an arbitrary length and you're likely capturing all the costs but only some of the benefits. And metrics that sidestep the period problem, like NER, do so by ignoring the cost of capital entirely.
There's no clean answer here. And that's not a coincidence.
In capital budgeting, this problem has a name. Every machine has an economic life — the period from commissioning to the point where replacement or major reinvestment becomes necessary.
Leasing strategies have the same concept. The economic life of any leasing strategy spans the time from the initial capital investment to the point where the next leasing strategy needs to be chosen. For spec suites, that might cover two or three tenancies, including the vacancies in-between. For a traditional lease, it may simply cover the term of the lease.
These are rarely the same length — and that's where the standard tools break down.
Consider two options for a vacant floor.
Option A is a traditional lease — a 10-year term with significant tenant improvements and six months free rent. The economic life runs the full term: 10 years.
Option B is a spec suite buildout — move-in ready, leasing in weeks rather than months, carrying two 3-year tenancies before the space needs a full refresh. Add buildout time, two vacancy periods, and the refresh itself, and the economic life runs roughly 7 years.
Now compare them.
On NPV, traditional leasing wins — almost by definition. Ten years of cash flows will produce a higher present value than seven, regardless of the quality of those cash flows. The metric is rewarding duration, not performance.
On NOI, spec suites win — but only because the buildout cost sits below the line. Strip that out and the returns look stronger than they are. The metric is ignoring the capital required to generate those returns.
On Net Effective Rent, the comparison looks cleaner — but only because NER averages incentives across the lease term without accounting for the cost of capital or what happens after the lease ends. It was designed to compare incentive structures within a single lease, not to evaluate options with different economic lives. Applied here, it produces a number that feels precise but is answering a different question entirely.
Each standard metric is giving you the wrong answer. Just for different reasons.
The metric that holds it all
The fix isn't forcing both options into the same window. It's a metric that normalises across different economic lives—one that converts every cash flow, regardless of when it falls or how long each cycle runs, into a single comparable number.
That metric exists. It's called Equivalent Monthly Annuity (EMA).
Think of it like this: instead of asking "which option generates more value over its lifetime?"—a question that's contaminated by how long each lifetime is—EMA asks "which option generates more value per month, on average, accounting for everything it costs to run?" Every cash flow goes in: rent, free rent, commissions, CapEx, vacancy. The answer comes out as a single monthly number.
Applied to our example: the traditional lease runs 10 years and the spec suite cycle runs 7. EMA doesn't care. It converts both into a monthly equivalent based on your cost of capital and lets you compare them directly. A longer economic life doesn't automatically win. A higher-cost option doesn't automatically lose. The metric normalises for the difference so the comparison is honest.
One number per option. Directly comparable. Regardless of how long each cycle runs.
A common objection at this point: "But spec suites only run 7 years. Traditional leasing gives me 10. I'd rather have 10 years of slightly lower cash flows than 7 years of higher ones."
Consider how you'd think about this with bonds. You wouldn't reject a 7-year bond simply because a 10-year bond exists. You'd compare the yield—what each instrument returns relative to what it costs, over its natural term. At maturity, you reinvest. The 7-year term isn't a limitation; it's just when the instrument matures and you make a new decision. You might have other reasons to prefer one term over the other — but that's a strategic question, and it's only worth asking once you understand the financial difference.
Leasing strategy works the same way. At the end of the economic life of whichever leasing strategy you chose, you face the decision again—same floor, same options, new market conditions. EMA is the yield equivalent: it tells you what each option actually returns per month, accounting for every cash flow across its full economic life. The duration difference is already in the calculation. That's not a weakness of the comparison. That's just how capital planning works.
The decision, reframed
The question your leasing team brought you wasn't really "traditional or spec suites?" The real question is which cash flow machine generates more value across its full economic life?
EMA isn't the final answer. It's the point where the real decision starts.
Until you've normalised the financials across each strategy's full economic life, you're not comparing options — you're comparing fragments. The first lease, the headline rent, a metric that only captures part of the picture.
Once you have that baseline, the real conversation can happen: which option fits your business plan, your risk tolerance, how the asset will be treated at exit. Those are strategic questions. But they can't be answered honestly until the financial comparison is clean.
That's the analysis ReturnSuite was built to support — leasing strategies evaluated the way capital projects are, across complete economic lives, with every cash flow normalised into a single comparable number.
Because this isn't a leasing question. It's a capital allocation decision. And it needs to be measured like one.
ReturnSuite's advisory service handles the financial comparison—every cash flow, every cycle, converted into a single defensible number—so the conversation in the room can be about strategy, not methodology.