Billy Gasparino and Jenna Dillon-Gasparino were savvy enough to wait out the housing boom of a decade ago as renters. Not until 2010, well into the bust, did they buy a house in the Venice neighborhood of Los Angeles, less than a mile from the beach, for $810,000. Only four years later, the couple see new signs of excess in the housing market and have decided to go back to renting. They are close to a deal to sell their house – for $1.35 million, a cool 67 percent gain. “It just seems like the housing market came back so...