Plant growing below flat roof
Plant roots will do damage to even brickwork, compromising the mortar or even cracking bricks. That looks to be stucco and it would not be as tough.
I would not want anything growing out of my walls.
I used to like the way ivy looked until purchasing a house with an ivy covered wall. The brickwork was in such bad shape we removed the brick and resided.
I would get a woody plant herbicide and spray the plant before permanent damage to the siding and possibly roofing is done.