When building masonry walls of more than a story high, the interior slab needs to be in place before fully erecting the wall. For concrete buildings this is not a problem however if it is a stell frame building, you might as well start and finish the columns and the beams right away and immediately after that start your masonry wall construction. And this goes quick too. If you come to a point that the interior metal decking is still not in place but you need to keep going with your masonry walls, you will need to take precautions for bracing your wall with temporary braces. Make sur eyou think about this ahead of time otherwise you will loose days there.