Density, which is a company that provides occupancy-tracking sensors, announced this week that it has just completed a $125 million funding round at a ~$1 billion valuation. This is their Series D. Official announcements, here and here.

On a practical level, the company provides workplace space analytics. They offer sensors that allow companies to anonymously measure how people are using their offices.

How long people are at their desks for (possibly weird), which conference rooms are most used, where people socialize, and so on. With the idea being that if you measure it, you can then optimize it. It’s about how to best use your real estate.

But their overarching mission is “to measure and improve out footprint on the world.” Their ambitions seem to go beyond just office space. It’s about how we occupy our cities, and using analytics to more efficiently design and build them going forward. And that’s pretty interesting.

I’m not intimately familiar with the company, but I thought I would share the news with all of you in case you’d also like to check them out.