Jen Rubin grew up in her father’s electronics store on Manhattan’s Upper West Side. In 1977, the largest blackout in U.S. history plunged all of New York City into darkness. Looters ran rampant, smashing Leon Rubin’s window and stealing most of his merchandise. The next day, Leon put up a sign, reading “We Are Staying.” That inspired the title for Jen Rubin’s new book “We Are Staying: Eighty Years in the Life of a Family, a Store, and a Neighborhood.”