7. Boarding houses. Advantages: You can get a lot more cash flow renting a house by the room, especially in a college town. Disadvantages: You can get a lot more headaches renting a house by the room, especially in a college town.

8. Commercial real estate. Advantages: Long term triple-net leases mean little management and high returns. Disadvantages: Tough market to break into, and you can lose income on vacant storefronts for a year at a time.

9. Buy, live in it, and sell. Advantages: The new tax law means you can fix it up, and sell for a big tax-free profit after two years, then start the process again. Disadvantages: You have to move a lot.

10. Speculation. Advantages: Buying in the path of growth and holding until values rise can yield large profits, especially if you buy low to start. Disadvantages: Prices aren't that predictable, you have expenses with no income while you're waiting, and transaction costs can eat much of the profits.