And finally, just to confirm what everyone who lives in LA already knows, that city (or collection of neighborhoods, or whatever) is already as flat as a British apartment -- here she is in all her incrementally larger glory.
And now, a brief word on methodology: So how did we figure all this out? Well, first you take the total land area of whatever place you’re talking about (thanks Wikipedia!). Then, you need to scour the Internet for total inventories of commercial, retail, residential, and industrial floorspace in that area (thanks, dozens of hard-to-find real estate sites!). And finally -- the real trick -- before adding these together, you need to eliminate the ground floor from each building, otherwise you’d be counting it twice. Doing this requires you to know something called the "floor area ratio" (the amount of floorspace a building’s footprint can take up) of each district, and thankfully, government sites usually provide this information. One you've accounted for that, voila!