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In the heart of downtown Los Angeles is the neighborhood of Bunker Hill. Once it was a steep hill covered with Victorian mansions and shops and reached by seemingly impossibly steep trains tracks.
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Over time their wealthy owners moved to the suburbs in places like Pasadena and the mansions became apartments and flophouses. The whole area became a giant filming location for film noir movies.
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In 1955 the city decided the neighborhood as is stood impeded the city's development. They declared it blighted (which of course once such a determination was made only led to area becoming truly blighted), eliminated the 150 foot height limit on new buildings, and leveled the district. Literally. About a hundred feet were shaved off the hill, tearing down most of the old buildings and making way for the steel and glass skyscrapers that dominate the downtown today.
I don't know anything about LA and I can't say much about the rightness or wrongness of what was done six decades ago. But I can provide a link to an amazing site ( On Bunker Hill) put together by local LA historians and aficionados in order to document the old, and long lost, Bunker Hill.