Off Broadway’s Public Theater has raised $28 million of the $35 million needed to fund the major renovation planned for the former library that houses the org, leadership announced at a groundbreaking ceremony Tuesday.

The update of the building, a former library, will involve changes including an expanded and spruced up lobby, larger restrooms, new climate control systems, a new box office, a community mezzanine and a staircase out front with a glass canopy.

Programming will continue in two of the org’s multiple stages, with a reduced slate of fare in another and a fourth occupied by the box office during construction. Shows at Joe’s Pub, an attached performance space, will be temporarily interrupted also.

Funds already contributed to the capital campaign come from both private and public sources, with the list of donors including the City of New York, Public board chair Warren Spector and Broadway producer Arielle Tepper Madover, among others.

The 55-year-old Public Theater has a high profile in the Gotham legit community, with recent productions including the starry “Twelfth Night” in Central Park last summer and the revival of “Hair” currently playing on the Main Stem.