I agree with Y-man, where you should get the body corporate to engage a structural engineer to do a report.
In the meantime, if you want some comments on the photos from someone who has a bit too much time on his hands..
The first photo concerns me.. mainly why it's a long horizontal crack along the block wall
would need to know more about shape of the building and the orientation of the crack relative to the rest of building. It shouldn't pose a problem for the balcony, as typically there is no bending interaction with balconies and their walls above.
Being exposed to the elements, the reinforcement in the block wall is slowly being corroded as we type, so action would be required sooner better than later.
Second photo would be from differential settlement i.e. one side/corner of the building has settled at a different rate relative to the other, either from the foundation not being homogeneously compacted/non homogeneous soil strata/or changes in moisture content effecting one side/corner only, causing the foundation to shrink/swell.
If you were to hold up an A4 peice of paper vertically and lengthwise, holding one side rigid and pulling down the other side, it should tear in the top in the middle.. similar to the crack in the second photo.
Again, durability of the wall is the main issue.. concrete walls should be repaired with a cementitous material, not spak filler. In the unlikely event the crack was to widen to say 5-10mm, then you'd be getting some serious problems with doors jamming, possibly windows cracking, and the roof trusses (if there are any) distorting/connections being damaged. In this case, underpinning of the sinking side would be required.. a very costly exercise.
Let us know how you get on?