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Property developer Zack Cupkovic said he didn't really discover Goose Island until four years ago, even though he grew up in the nearby Lakeview neighborhood. The man-made island was created in 1857, when the North Branch canal was completed on the east side of the land mass, separating it from the mainland. When you drive across the island on Division Street, Cupkovic said, "it barely seems like you're going over an island."