A plan to build a casino over a sprawling rail yard on Manhattan’s Far West Side has a new, formidable opponent: parkgoers.

Friends of the High Line, an influential nonprofit that operates the nearby 1.5-mile rail-line-turned-park, said Wednesday that it will muster supporters to attempt to thwart the development plan. The opponents of the casino proposal said the development would block views of the city from the High Line and create gusty winds and cast long shadows that could hurt local businesses.

The proposal, submitted in February, would also create a 1,180-foot apartment tower, a 1,376-foot office building, a public school and day care.

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