I rent a small office in an annexe with 5 other offices.
There is one office which smells terrible. The smell is only there when the person renting it is in, and they sit with the door open.
It smells of rancid cheese. At first I thought it was something unfortunate they'd bought in for lunch, or left in a bag, but it's persistent.
It's definitely coming from them personally or something permanently in their room.
It's not a problem when I'm sitting in my office but I can't keep my door open and have to breathe through my mouth if I need the loo.
I've spoken to them and they are very nice. Obviously we are all self-employed so it's not like there is someone in HR who can have a word.