I work within a small complex of business units, each with their own entrance from the outside. There are only a few units (5) on the estate, all detached from each other and as we're rather rural, it's a peaceful haven with no traffic noise and hardly any pedestrians passing either.
Recently, new tenants have moved into one of the units and most of the staff from this business have taken to leaving their building to make their important phone calls that they don't want their colleagues to overhear, choosing instead to stand right outside my business unit. They are all men with deep booming voices and stand right by my window (presumably as we have a slight exterior porch - which the other units do not - so this offers some protection from the elements).
The business units are listed buildings in a converted former industrial complex and have single glazed windows so have terrible soundproofing. I can hear every word of what's being said of every conversation - they might as well come in as it sounds like they're in my building anyway.
I work in a creative role and am finding this horrifically distracting and it's so loud that people on the phone to me have commented asking if I had someone else in the office. I had a polite word a couple of weeks ago but they laughed at me and said I don't rent the outside space so it's none of my business.
AIBU to think that you just don't do this? Many of them also vape outside my window too, so my office has a near-permanent smell of tutti fruiti 
.
Should I just suck it up or have another word?