Our block is 1965. We have a bylaw which regulates where the condensers and piping can be placed. It also states that all pipes and tubing must be encased in a aluminium rectangular downpipe that closely matches the colour of the brickwork.
You basically need a bylaw that will give a uniform appearance to any air cons rather than a mish mash of pipes and tunes going everywhere depending on the owner.
We were lucky in that all units were going down one side wall that is not viewable from the street and residents rarely venture.