A $12 billion proposal to build a casino over the train storage area west of Hudson Yards would include three skyscrapers and over 5 acres of public open space, new filings with the city reveal as the competition to secure permission to build one of three casinos in the New York City area heats up.

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Related Companies, the developer behind Hudson Yards, filed a rezoning application with the Department of City Planning on Tuesday that includes long-awaited details of its casino plans.

If Related manages to secure the requisite state gaming license, the firm hopes to develop the 13-acre site it owns above the MTA’s West Side Yard between 11th and 12th Aves. with a casino, hotel, offices, housing, public school and open space.