Alexandra Ryan-Yavaşca wanted to settle down in her childhood hometown of San Diego, California, to raise a family with her husband Utku. 

But due to soaring housing costs, the 34-year-old can't afford to live there like her parents — a teacher and public relations professional — could on middle-class salaries. Her childhood home, purchased in 1996 for more than $300,000, is now worth more than $1.2 million.