In the following sentence:
The great cities have been built with no regard for us. The shape and dimensions of the skyscrapers depend entirely on the necessity of obtaining the maximum income per square foot of ground.
Should "the shape" be changed to "the shapes", since "the skyscrapers" each have different shapes?
Or should we change "the shape and dimensions of the skyscrapers" to "the shape and dimensions of the skyscraper" if the original sentence means to be a general statement?