That was surprisingly easy, wasn't it! Perspective drawing isn't difficult if you take it one stage at a time. Of course, this is just a very simple shape - more complicated objects can become quite tricky. Practice drawing simple figures in three-point perspective from various angles to become confident with the method.
When sketching a building, we don't always construct perspective precisely like this - but knowing how it looks will help you to draw it correctly. I like to indicate the main structure, rule some very light guidelines, then draw carefully freehand, to maintain consistency within the image. You can also use a straightege (ruler or book edge) to against the pencil body or your hand, rather than the point, to get a line that is straight but not too mechanical. Try sketching a tall building in three point perspective and see what works for you. Try some brick and stone textures to add interest to the surfaces.
