Air-con installation on a common property wall

Hi There,

We bought an apartment and would like to install the air-con. We put the approval form forward which was rejected. As we were explained if one of the owner is against our air-con unit on the common property wall – this will not go ahead. I would like to notice that there are already 2 air-con units installed on the common property wall and the second one was installed after we were refused to do so (as the permission was given incorrectly and they could not do anything about it).

Would appreciate your advice on the above – whether this is correct if one owner is against – nothing is going ahead and whether based on the precedents set (2 air-con installed) – we can argue about it and install it even without approval from the Committe.

Thank you