When the project is complete the CTA said the Uptown neighborhood will have a "modern, fully accessible station." More than a half mile of tracks will be replaced.
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Mayor Rahm Emanuel said the neighborhood is seeing other benefits as well.
"If you invest in good public transportation it's a multiplier and you get all this other investment that comes along side that would not have happened before," he said.
That new investment includes retail and residential projects.
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The Wilson station will remain open during construction.
On Thursday, the mayor tweeted about the station's progress.