Fidelity Investments is seen as the top prospective buyer of Bank of America’s tower on 100 Federal St. in Boston, the Boston Herald reports.

According to real estate executives, Bank of America scrapped plans to lease some of the individual empty offices in the tower, opting to sell it instead. The price tag would reportedly be around $400 million, although experts say that filling up the office space could convert the purchase into a $200 million profit for Fidelity if it built up and sold the building.

While neither company would comment on the report, executives say the allure for Fidelity would be both the investment opportunity and the chance to house thousands of its own workers in the tower, which has square footage of more than one million feet.

Bank of America had originally taken over the tower when it acquired FleetBoston Financial Corp.

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