Watch 7th Floor full movie online Movies123. Watch 7th Floor 123movies online for free. 7th Floor 123Movies: Buenos Aires, Argentina. Sebastián, a successful lawyer, leaves his ex-wife's condo, located on the seventh floor of an apartment building, to take his two children to school. While they run down the stairs, he uses the elevator. Once on the ground floor, Sebastián awaits the arrival of the children.