Permitting the landowner to park cars establishes a value based on the value of future income  from parking revenues. Increasing the use from a parking lot to a tenstorey condo tower further  enhances the value. There is a strong argument to share part of that gain between the landowner and the  community or public, because in the absence of the public decision the landowner would not  have achieved any increase in value. It is effectively a win–win and actually creates new value at no cost. The existing landowner benefits and so does the community, at no cost to either.