I wouldn't know if the 999 yr thing is true, but a moment's thought (Aspirin can dull the pain) will help us all realize that in a crowd of folks like a city, 'ownership' means only that your neighbours have all agreed to leave you alone—sorta, more or less—on a given patch of ground. We're all way too close together for 'anything goes' to be the rule on 'your' property, even if we all feel a genetic nostalgia for the olden days, back on the savannah when the nearest neighbour was a bonobo family in an acacia tree on the horizon, and 'what was ours was ours'.
If you expect everyone else to play by the rules and leave you the untroubled master of your land, then you'd better play their game, by their rules. The planning, zoning and permitting process these folks ignored, flouted, then foolishly and expensively dragged the City through is actually pretty accommodating and reasonable, and for all it's bureaucratic fussiness it tends to favour change.
These folks just wouldn't listen.