Now press Ctrl+A to select the whole picture and click Image/Transform/Distort.
Note: Photoshop Elements also contains a Perspective feature (under Image/Transform/Perspective) for this purpose but Distort provides much more options.
Distort draws a border around the picture, with handles on the corners and midpoints. In the Navigator window, shrink the picture until it fits well in the middle of the screen. By dragging the handles of the upper corners, pull them until the edges of the building get parallel with the gridlines. You can drag all handles freely to transform the image as you like. When performing perspective correction, the lower handles are rarely needed.