I'm a San Francisco realtor who works both sides of the table — helping families outgrow their space and find room to breathe, and helping homeowners sell for what their property is actually worth.

If you're a growing family in SF — dual-income, married, juggling school pickups and a social calendar — I'm not guessing at what you need. I'm living it. I know what "more space" actually means in a city where every square foot costs a fight: a layou...