unfortunately the management says it's "okay" but will need the contractor to have a look at the wall to determine. I suppose the best way to see it is to drill a hole and see if it's RC or not.

I have once looked at another unit when contemplating to buy, that the owner had removed part of the toilet wall, leaving the inner wall shortened (as per how i'd like to do mine. The storage room was left intact.

The proper blueprints, believe it or not are no longer with the developers. This was the only one i could get my hands on.