When you can't access your balcony

Here is an account of one person who sued when they didn't have access to the shared terrace space they were paying for
Access Denied

Here's another article featured in the Brick Underground that gives you even more insight into what a co-op board can and can't do.
More legal judgments

My reason for providing links to this information is that these stories imply that Amalgamated Cooperators who have lost access to their balconies have little or no legal recourse.  The work is progressing, it does not appear that these repairs will last more than a couple of years.