Agree with the suggestion to do some discovery work to see what is in the wall.
Assuming its a hollow wall - no permit would likely be needed for drywall-only work (fire rated would be between units on all sides), but then you're getting a likely `12" wide opening between studs when all is said and done....a lot of work/finishing for a small hole. Seems like a marginal gain for a lot of effort. Better off going whole hog on the wall and spending the $ on an engineer.
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