Melio, a financial technology firm, is the first completed lease at the RAL Development Services’ Union Square tech hub, Zero Irving. Melio’s deal includes 25,000 SF, the entire 15th and 16th floors of the 21-story office building. Melio is relocating from a WeWork space at the 11-story 18 West 18th Street. The company plans to build out its new office at 124 East 14th Street and move in upon completion.