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There’s a massive, incredibly dense neighborhood of houses and offices less than 1000 feet to the south, west, and north of every one of SFOs runways.

SFO is surrounded by numerous highways, office buildings, and residential areas

well yeah but im talking about the part where the planes land not the terminal.

There runway thresholds are closer to the neighborhoods than the entire terminal except a few A terminal gates.

Go look at a satellite view of SFO.

It is 400m from the threshold of 19L/1R to the nearest residential neighborhood at SFO. LGA, which is an incredibly urban airport has the exact same distance from the end of its closest runway to the nearest residential area.