In 2008, Scott Engle plunked down nearly $50,000 from savings and maxed-out credit cards to start a real estate brokerage -- a risk he took with a newborn baby.His company, El Cajon-based Realty Source, now has grown to 200 agents who serve areas including San Diego, Orange and Riverside counties.The 28-year-old and his work have been recognized by Realtor Magazine's annual 30 Under 30 list, whi