There are a number of folks who take their regular buildings (1' grids with the building 7x7 inches) and they upscale it by 107% to make it 7.5' square. Other pieces take up most of an entire sheet of paper as it is. Some pieces are already small, and if you grabbed that image from the original pdf and plunked it down on it's own page, you could scale it up quite a bit. Scaling down is easy – there's always room on the page to get smaller.
