Lost phone, I know the adress where it's located. What to do?

Hello! I have forgotten my phone on Öresundståget earlier today while traveling from Sweden to Denmark. Through the "Find my" app on the iPhone I can see where my phone is so I have the adress. What would you recommend me to do? I can't just knock on every door asking if they have my phone.

One important detail to mention is that I went to that adress and saw one or two personel from Öresundståget (they were wearing the uniform from Öresundståget) going out of that building so my theory is that they are letting the workers stay there overnight (it might be just a strange coincidence and I'm exagerating)