How often do you take pictures where the buildings are falling away from you. Before digital there were two ways to correct this.

By using a 4×5 camera you would get the film to be parallel to the building and then adjust the tilts and swings of the lens mount to get you a photo where the building looks straight.

You could also while printing the photo adjust the easel until you also made the building look correct.

Using Lightroom I was able to take the above photo and correct it to the lower photo.

Here is a video showing you how I did that correction.

[youtube https://www.youtube.com/watch?v=QPhR6kGPxp8]