A law firm that Mayor de Blasio owes $300,000 in unpaid legal fees to last fall won a zoning loophole for one of its developer clients after lobbying two of the mayor’s top aides, a Daily News investigation has found.

Kramer Levin Naftalis & Frankel pressed Deputy Mayor Alicia Glen and Marisa Lago, the mayor’s appointee as City Planning Commission chairwoman, to halt rezoning that would have killed a residential tower being built on the East Side by the law firm’s client, developer Jonathan Kalikow.

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By then, Councilman Ben Kallos argues, the damage was done. He says the delay allowed Kalikow to build enough of the tower’s foundation to claim the building as substantially completed – the trigger for approval of the entire building by the Board of Standards and Appeals.

“Without this bogus clause, this rezoning could have been done weeks earlier and the community wouldn’t be facing an appeal to a rightfully won rezoning,” said Kallos (D-Manhattan), who opposes Kalikow’s tower.