Could just try Wikipedia. It has WY more info than Anons could ever dig up. They're all too busy looking for hidden children.
Ownership dispute and discovery of illegal tunnel
Since at least the 2000s, the building has been subject to a dispute between the Agudas Chasidei Chabad (the umbrella organization for the worldwide Chabad-Lubavitch movement) and the Gabbaim, who control day-to-day operations of the main synagogue and belong to a sect of Messianic Chasidim who believe that Rabbi Menachem Mendel Schneerson, the seventh Chabad Rebbe, is still physically alive and the Jewish Messiah.[12] Though a court ruling in 2006 decided that full ownership of 770 belongs to Agudas Chasidei Chabad, ongoing legal disputes have prevented either party from altering the structure.[12]
In December 2023, an illegal tunnel was discovered connecting the main synagogue to a nearby unused mikveh.[13][14] The New York Times reported that the tunnel was part of an attempted expansion of 770.[5] In response, Chabad leadership closed the women's balcony on the floor above until the tunnel could be filled in[14] and called in construction crews to flood the expansion with concrete.[15] When workers tried to fill the tunnel on January 8, 2024, clashes broke out between Chabad messianists, who tried to prevent the tunnel from being filled,[16] and the New York City Police Department (NYPD).[16] The NYPD arrested nine people,[17][18] and the building was temporarily closed pending a structural safety review.[19] Footage of the January 8 incident and tunnel went viral on social media.[20]