Housing stories in California can leave me feeling, well, depressed.Thousands of vacant lots that could be used for housing, but remain empty. Affordable home options shrinking. Aging Californians staying in their too-big homes, limiting market availability.Alas, you get the point. But as I was reporting that last story, I stumbled upon a trend that left me with some unexpected warm fuzzies: an uptick in intergenerational roommates.An increasing number of California seniors with extra space in their homes — often empty nesters — are considering bringing in younger roommates to help pay bills and, in the process, provide renters with affordable...