Trump-hating residents at a posh Upper West Side co-op building decided to celebrate Presidents Day weekend by plastering their windows with signs denouncing the new commander in chief — setting off a war with building management, which ordered them to cut it out.

The co-op board at 415 Central Park West warned the anti-Trumpers that the signs — which spell out the word “RESIST” in large block letters across several windows— are a clear violation of building by-laws prohibiting the display of advertising.

“It’s a house rule. Notices are a reminder of just what the house rules are,” said board President Gloria Baker, adding that the co-op board’s request had nothing to do with politics.

“There are people very much in favor of the signs and people who are not,” she said.

The dozen or so handmade signs, which were visible from street level and the park, went up Friday and were expected to be taken down by Monday night, said some of those participating in the protest.

“They are a sign of resistance about the injustices being done and [that] will be done by the Trump administration,” said Linda Goldenberg, 75, a 14th-floor resident who was among those displaying the signs.

“The letters may not have the greatest visibility, but they are something. We wanted to do this for Presidents [Day] weekend, and even if they come down pretty soon, it was a statement for the weekend.”

Sandy Roche, 83, who not only had a sign in her window but also attended an anti-Trump rally, admitted that the board’s request was reasonable.

“They reminded us the signs are against condo rules. It’s a perfectly legitimate rule to have,” she said. “ They don’t want advertising in their windows.”

Third-floor resident Barbara Dick said not everyone in the liberal Upper West Side neighborhood was opposed to the new president.

“People are pro-Trump in the building, but they better not speak about it or they will be lynched,” said one tenant, who gave his name only as Dick, 65.

“This was a concerted movement among a group of shareholders to display their displeasure.

“I’m not saying people don’t have the right to protest. He won the election and we have to move on — that is how I feel.”

The 17-story building between West 101st and West 102nd streets boasts spectacular park views. Apartments with three bedrooms can go for as much as $2.3 million.

A rep for Matthew Adam Properties, which manages the building, did not return a call for comment.

The prewar building, which overlooks Central Park’s “Pool,” was once home to jazz musicians, including Curtis Fuller, Max Roach and Art Blakey.

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