For many of , our most significant investment and largest profits in life are due to having bought a house — something that acts as a de facto bank account, grows in equity and provides shelter all at once. But what if we want to use real estate as a money-making opportunity instead?Real estate has, of course, made many millionaires. The Wall Street Journal recently reported how more than 80% of borrowers who refinanced in the third quarter chose the “cash out” option, withdrawing $14.6B in equity out of their homes, according to government-sponsored mortgage corporation Freddie Mac. Now, many are finding their homes to be a tappable source of wealth. “Home equity is the big pot of gold,” said Sam Khater, the chief economist at Freddie Mac.