You may have noticed that in After Effects, there are several ways to accomplish the same result. When you're deciding which technique is best, it often comes down to personal preference and work style. Sometimes the best technique is the one that can be most easily revised when your client wants you to tweak things here and there.
The objective in the next few steps is to reveal sections of the LA HI-RISE title at different times. One way to accomplish this is to duplicate the text layer and apply a separate mask to each text layer while staggering the start time for each layer. You can also create a separate text layer for each group of letters and then animate the layers separately. In this project you'll use only one layer to do this, because it takes fewer system resources and allows previews to play back more quickly: