Flooding basement

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A property I am looking to make an offer on has a flooding problem in the basement every time it rains. The sub-pump is located in the corner of the basement. I'm guessing in order to prevent further flooding I would have to dig out the concrete floors and re-locate the sub pump more to the middle. I would hire a contractor to do this but does anyone have any idea of how much this would cost? A rough estimate would help.