It doesn't seem optimal for sex because there's no bed or bathroom in the room. Especially regarding the bathroom - who wants to get dressed and walk through a commercial space right after having sex just to use the restroom?

Meanwhile, in NYC there are plenty of options for "hourly" hotels that get you a room for 2-3 hours for 50-60 dollars, which is about the rate of Breather.

"To discourage hanky-panky, there are no curtains, and no overnight stays; cleaners refresh the rooms at the end of every booking"

Though, uh, as Ian Malcom put it in Jurassic Park: "Life finds a way"

To be honest this is a good idea and it's a pain point I've had before. Meet a potential one night stand when you're travelling but can't use wherever you are staing. Nice room you can book really quickly as a place to spend the night would be great. Locate them near downtown cores and it's like Love Hotels except better (and hopefully less sketchy).

If these are in commercial buildings I am wondering if this couldn't be solved by installing security cameras?

But why it even has to be solved?

I was intern at research facility that had this story as part of the local folklore: male researcher and female researcher stayed the night to supervise long-lasting experiment, fire inspector was doing rounds and walked upon them having sex. He reported this to the director of the facility. Director said "I don't see how fire safety was affected" and dismissed the complaint.

The only reason is because your other clients might object - they might not want to be put in the position of having to ignore what is going on next door in the middle of a meeting.