Mark Rothko and his first wife, Edith Sachar, put down roots in a small apartment within a Greek Revival townhouse in Manhattan’s East Village neighborhood in the 1930s. There, the late abstract expressionist—famously known for his color field technique—created the painting titled “Thru the Window,” inscribing the back with the building’s address, “313 E 6th,” along with his signature. The entire multifamily building sold for $45,000 in the 1970s to pioneering filmmaker Emile de Antonio, known for his documentaries on the Kennedy assassination and the Vietnam War. Later, artist Alfred Leslie used the garden level as his studio. After a fire destroyed the top floor of the prewar dwelling in 2022, the vacant and gutted structure hit the market the following year for the first time in over five decades.…