Puppy peeing in the hallway

3-month old puppy keeps peeing in the building hallway. He’s an Alaskan Malamute, that already comprehends peeing at home is a no-no and will let me know when he wants to go outside. Hell, he is able to spend the night without peeing (midnight to 7 am)!

However, we live in a 7th floor, so he’d need to wait it out until we get downstairs. But no, while he did when he came home for the first few days, one day he decided peeing in the hallway is cool, and will consistently pee there, no matter how often we take him outside. And yes, we clean with enzyme cleaner every single time he pees inside the building

I’ve tried telling him to sit while waiting for the elevator, I’ve tried to keep walking while waiting, I’ve even tried to hold him until we get downstairs. Doesn’t matter, he will still pee, even if he is on my arms.

I’m out of ideas. What the frick do I do? How can I teach him and reward him for peeing outside if he never does? I do work remote, but I obviously can’t the whole day outside waiting for the next pee.