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If it's something that big I would blockquote it (as you've done here for your post) and indent it, and then leave off quotes. It's not dialogue, which has specific practices for multiple paragraph...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/19349 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/19349 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
If it's something that big I would blockquote it (as you've done here for your post) and indent it, and then leave off quotes. It's not dialogue, which has specific practices for multiple paragraphs in a row, and I'd be worried that my reader would forget that I'm quoting someone.