Kastle's latest data, picked up by Propmodo this week, shows office attendance peaking at 51% of pre-pandemic levels midweek and collapsing to 29% by Friday in major cities. The conventional take: Friday is the broken day. Fix Friday and you fix the office.

I've been looking at our own behavioral data, and I think everyone's chasing the wrong day.

Across HqO's US portfolio, we tracked door unlocks day by day for the last 90 days against the 90 days before that. Same buildings. Same tenants. Same calendar pressures everyone else is reading about. Here's what shifted.

Monday dropped 3.2 percentage points of weekly share. It's now barely 15% of the week. Friday? Down 0.6 points. Basically flat.

Tuesday, Wednesday, and Thursday gained almost 4 points combined. Tuesday and Thursday are now nearly tied for the busiest day in the building, each pulling in over 22% of weekly traffic. The classic three-day office core (Tue–Thu) accounts for nearly 69% of every door swipe across our portfolio.

So the consultants writing the "Friday is dying" headlines are looking at a flat trend line. The real story is that Monday is quietly disappearing.

Why does this matter? Because the policy response is completely different.

If Friday is your problem, you write a Friday mandate. You add a free lunch. You program something. Companies have been trying that playbook for three years and it hasn't moved the needle.

If Monday is your problem, you've got something more interesting on your hands. People are choosing where to start their week. And they're not choosing the office. They're easing in from home, doing async work, and arriving at the building Tuesday morning when collaboration is already queued up.

That's not a Monday problem. That's a hybrid pattern stabilizing into something predictable. The four-day in-office week isn't being mandated. It's being chosen, starting Tuesday morning.

Now look at what those Tuesday-through-Thursday people actually do once they're inside.

Across our portfolio, conference room bookings are up across nearly every category, anywhere from 35% to over 300% versus the prior period. Roof deck bookings up nearly 170%. Outdoor space up over 130%. Large meeting rooms up 140%.

What's down? Kitchen bookings off 39%. Lounge bookings off 29%.

That's the entire story in two columns. People aren't coming into the office to eat. They aren't coming in to lounge around. They're coming in to meet, to think out loud with a whiteboard, to be on the roof in May, to use the parts of the building they can't replicate from a kitchen island in Brookline or a guest room in Tribeca.

The office isn't dying. It's specializing. It's becoming a coordination layer, not a containment layer.

If you're a landlord still optimizing for the five-day, 9-to-5 anchor tenant, you're operating a 2019 asset in a 2026 demand profile. The buildings winning right now have figured out two things: their busy days are busier than ever, and their slow days are slower than ever. Programming, staffing, and amenity throughput have to match that curve. Otherwise you're paying full freight to run an empty lobby on Mondays and capacity-constrained meeting rooms on Wednesdays.

If you're a tenant, the implication is more direct. Stop measuring your office investment by total square feet and full-week utilization. Measure it by Tuesday-through-Thursday throughput per dollar. That's the demand you're actually buying.

Leesman has been signaling this from the employee side for years. The Experience Gap between home and office is biggest on tasks that require focus and individual productivity, and smallest on tasks that require collaboration. Our behavioral data says employees are voting accordingly. They're at home for focus work. They come in for the things the office is genuinely better at.

So here's the call. The next 12 months in office isn't about restoring Friday or chasing some 5-day return-to-office fantasy. It's about asset operators getting honest about the demand curve they actually have and building experiences that match it.

Buildings that lean into the Tuesday-Thursday spike — collaboration capacity, outdoor space, real food and beverage on the days people are actually there — pull ahead.

Buildings that keep arguing about Friday will keep losing Monday too.