The Economics of an Empty Night

Vacancy can be a lever for protecting NOI in institutional real estate

Every conversation about vacancy in institutional real estate starts the same way: an empty unit is treated as a fault to find and fix, something to explain away before the next investment committee meeting. I think that instinct is wrong. The most sophisticated owners I work with treat void periods as one of several levers they manage deliberately, alongside pricing, unit mix, lease-up sequencing and marketing spend. A vacant night is capacity that hasn't been assigned a strategy yet.

The reframe I'd make is this: flexible and short-term use belongs in that same category of deliberate portfolio management. It sits alongside every other tool an asset manager already uses.

What discounting actually costs

Every institutional owner already accepts that 100% occupancy, every night, isn't realistic and isn't even efficient. Turnover has a cost. Marketing has a cost. So does accepting the wrong tenant to avoid a gap. Owners make these trade-offs constantly, and nobody calls it a failure. It's asset management.

The same logic extends to rate. Occupancy is a useful proxy for performance, but it's incomplete on its own, and a portfolio can lift occupancy simply by discounting rent whenever a unit sits empty. That discount lowers the achieved rate across the whole book. The number that actually matters is NOI, and a rising occupancy rate driven by discounting can still produce a falling NOI. A portfolio that carries a higher level of structural void, and prices those nights through flexible and short-term use at full rate, can generate a stronger NOI than one that chases occupancy by cutting rent. Structural void, handled this way, becomes priced inventory. It stops being a gap to apologise for.

This matters more to investors than it does to the operations team on the ground. An asset that protects income across the full calendar, not only at peak occupancy, produces cleaner yield numbers and a more defensible IRR case. It also stops leaking value in the gap between one resident leaving and the next arriving.

I'll go deeper on the scale of this opportunity in a follow-up piece on the 13% of UK nights that currently sit unoccupied. The size of that number changes how the conversation should be had. The strategic case holds regardless of scale: idle capacity is capacity an owner has already paid for.

Where the hesitation actually comes from

Almost every BTR and PBSA operator I talk to raises the same concern, and it's a legitimate one. It centres on the building itself: how it will feel to residents already living there, what happens if a guest causes a problem at 11pm, and whether this becomes another operational burden for the on-site team to carry.

Those are the right questions to ask.

This part of the industry tends to get sold through the platform: the booking engine, the tech stack, the automation. I think that leads with the wrong layer of the problem. What resolves an operator's nervousness is knowing who vetted the guest before they arrived, who is checking them in, and what protects the building and the resident if something does go wrong. Those are standards, and they're what our approach at UnderTheDoormat Group is built around: screening, personal check-in, and insurance that covers the scenario an operator is actually worried about. Technology matters and has its place, but it supports the service standard.

When the unit becomes a benefit

One example of this working in practice is our partnership with Way of Life. One lever they use is offering guest suites: a space residents can book first, for their own visiting friends and family, before it's offered more widely.

That single decision changes the risk conversation. The same square footage becomes a resident perk: friends and family of people who already live there get first call on the space, before it's offered externally. Short-term use becomes something that benefits the building's own community. It's a small structural choice with an outsized effect on how flexible use lands with residents, the on-site team, and the brand.

How partnerships actually start

One assumption I hear often is that engaging with flexible use means committing to a fully built, tech-led operation from day one. Most of our relationships start small and expand as the model has proven itself, and both sides earn more as it grows.

Treat it like every other lever

None of this requires an operator to change how they talk about their portfolio or admit that something isn't working. It requires treating void periods the way every other lever in the portfolio is already treated: managed deliberately, by people who know what they're doing, protecting residents, brand and income at the same time. Vacancy, priced and planned for, is one of the more reliable ways to protect the number that matters most: NOI.