The developers selected to build an affordable housing complex on the site of Manhattan’s Elizabeth St. Garden sued Mayor Adams and his top deputy, Randy Mastro, on Wednesday over their attempt to block the project by designating the site as “parkland.”

The lawsuit, brought by a consortium of developers and social services providers tapped to oversee the long-stalled project, is asking a Manhattan Supreme Court judge to immediately impose a temporary restraining order barring the designation from becoming official.

Specifically, the plaintiffs charged Adams and Mastro, his first deputy mayor, violated the city’s so-called ULURP land use process by taking the unusual step earlier this month of declaring the Nolita garden parkland, a step that would effectively prohibit construction on

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