Passive real estate investing made super easy!
No tenants, toilets or trouble.  Some investors are active and some are passive.  I personally enjoy buying mortgage notes / trust deeds and holding the paper instead of the property as a passive investor.  Acting as the bank and collecting interest leaves someone else in charge of the property management, vacancy and phone calls and possible lawsuits.  Holding trust deeds / mortgage notes pays me 12% annually and there is no maintenance through the servicing center I use. 

I was at a local NJ REIA meeting last week, there was a gentlemen (realtor), he was representing a investor that had a large portfolio of mortgage notes. After talking to him for a while he showed me a list of about 30 performing notes the investor was trying to liquidate. I don't have enough capital (yet) to invest in notes but it seems like a solid method of getting consist returns.