In the past there has been significant amount structural density on these blocks. This is especially true in the 25 years from 1925 to 1950. There was obviously an economic decline throughout this area. That decline did not have a significant effect on the structural density of the area. What did happen was a rise in the number of vacancies and neglect of properties. Buildings do exist which could be  rehabbed and repurposed or , I believe, should be demolished.