Never mind why there's a perpetual hurricane. This is about a building being built in it.
Let's say that there's a perpetual hurricane that constantly "hovers" in one location - say, over northern Africa, if that's relevant to the question. It's been there for 2 million years, if that's relevant either. It doesn't have an eye, if that's relevant either. Yes, I know it's not a normal hurricane. No, that does not matter.
There are a bunch of alien artifacts embedded within this hurricane. Some of them are too large to move out of it - we're talking "skyscraper-sized", or "they take up the width and length of a football field".
This means that, in order to research these things, people must go into the hurricane.
Now, take into account the following conditions:
Flying vegetation, rock chunks, sand, etc. - if it can be blown, it's flying around in there, and statistically speaking it'll hit something eventually. Sure, most of it was stripped away during the first few thousand years of the hurricane, but occasionally the hurricane pulls some vegetation out of the swamp region, or desert winds funnel sand into the low-pressure region it occupies, or it chips off a chunk of rock, or someone looses a glove, etc.
Constant wind that ranges from "breeze" (outlying areas) up to 250 kilometers per hour (core). It always blows counterclockwise, if that's relevant.
Visibility that rapidly decreases the closer to the core you go.
100% humidity, all the time, every time, unless you're in the outlying regions and not the hurricane itself.
High air temperature.
Potential tornados embedded in the hurricane.
Constant, constant, constant torrential rainfall; even the outlying swamps see rain on a daily basis.
Potentially very lumpy (if physically smooth) terrain towards the core where rock formations have been exposed.
I recognize that an answer you might be trending towards is "underground bunker", but here's a counterpoint to that answer: "flooding". After all, this thing is likely being built under torrential rainfall.
What would be the design features of an international research station designed to support such a mission?
One mandatory feature is that it has some form of access to the surface, for the purposes of maintenance, overland travel, and potential emergency evacuation.
A followup to this.