As I have said many times on this forum, there are no StrataKops who are going to come crashing thorough those windows of yours to enforce that laws and by-laws. Even if there were, this is far from clear cut.
So you have three options;
1) persuade enough of your neighbours that this is a bad idea.
2) if you don’t have the numbers, tell the general meeting that you plan to challenge the decision on the grounds that it should be a special resolution and should have been marked on the agenda as such
3) if nthat doesn’t work, be prepared to go for an interim adjudication to halt the work until such times as it can be determined whether ot not this required a special resolution.
To be honest, if I were on your EC and was reading this, I would go for a special resolution and just make sure I had the numbers.