[King&James]

So one could effectively remove speculation by capping height of all sites at current level, then create a suggested height / density level, and have an published index/scale of density/height bonus above that for developments that meet set criteria of "public good" within the city (affordable units, park space, rec facilities, funding for libraries, you name it give it a bonus factor. Only developments bilding to the submitted proposals can build, otherwise anyone can happily build to the current height/density of the site.