For this one point perspective piece I did a light horizontal and vertical lines across the paper which lines up where the indents on the building on the right with.
I then used the ruler from the point in the centre and did two lines going outward to the foreground to create the road.
For the buildings i used the vertical line to help line up where the buildings go into the distance with a ruler going from this line to the edge of the paper. This helped add depth when i then drew the front parts of the building, to give it a sense of being three dimensional.