Thanks for the replies.
Re my question: the issue is that the OC, in order to save money, wants to build a structure that gives owners less than they currently have and want. For example, some owners will lose an entire wall and end up with a balcony they don’t want (because it has no outlook, no sun, little light, too much exposure and is too small to use) in place of a laundry they do want.
The OC and the owners want to know what the obligations of the OC are in cases like this. That is, when part of each lot has to be demolished and rebuilt, is the OC obliged to rebuild so that each owner gets what they had, or can the OC just return each lot owner the amount of space they had but not walls, windows, functionality etc.?
Re by-law: My understanding is that unless responsibility for the maintenance and repair of altered common property (no matter who it’s altered by) is passed by by-law to the lot owner, it rests with the OC. Is that incorrect?