Frederick Banting realized that this procedure would destroy the trypsin-secreting cells but not the insulin. Once the trypsin-secreting cells had died, insulin could be extracted from the islets of Langerhans. Banting discussed this approach with J. J. R. Macleod, Professor of Physiology at the University of Toronto. Macleod provided experimental facilities and the assistance of one of his students, Charles Best. Banting and Best, with the assistance of biochemist James Collip, began the production of insulin by this means. As the experiments proceeded, the required quantities could no longer be obtained by performing surgery on living dogs. In November 1921, Banting hit
Highest and best use of the land as vacant exceeds the value of the property as improved less reversion/demolition costs, then redevelopment of the site becomes the maximally productive use of the property, and continued use of the existing improvements that do not represent the highest net value of the site is considered to be financially unfeasible. Finally, the use must generate the highest net return (profit) to the developer. A property that could hypothetically be developed with residential, commercial or industrial development might only have one of those uses as its highest and best use. These three hypothetical development scenarios follow to illustrate