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「東京マラソン」は、東京都庁をスタートして、銀座や浅草など観光地を走る人気のマラソン大会です。
The Tokyo Marathon is a popular race that runs through tourist areas like Ginza and Asakusa and starts at the government office.
Clearly this を is not the object particle (the race isn't starting the office). I know that を can also mean 'through' like the second time it appears above. But I'm sure the race doesn't start through the office either.
So を must have another meaning I don't know, or it's a typo for で. I assume the former.
This is a slightly exceptional (and very important) usage of 「を」 employed with motion verbs that actually are intransitive verbs.
「東京都庁{とうきょうとちょう}をスタートして」 = "(the marathon) starts at the Tokyo Metropolitan Government Building and"
「銀座{ぎんざ}や浅草{あさくさ}など観光地{かんこうち}を走{はし}る」 = "(it) runs through the sight-seeing spots such as Ginza and Asakusa"
Both 「スタートする」 and 「走る」 are intransitive verbs here.
