Why would seller sell?

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I been trying to get a great deal from a bad or run-down looking property, but when i see a nice and sometimes impressive Cap rate it got me thinking why would they sell? Obviously, there maybe higher expenses, or refinance the property but the value is actually lower than their purchase price or burnout landlord or others. 

Can anyone tell me what are the other reasons the seller want to sell their "Condos" or "Retails Property" when the Cap rate is impressive or a good that is too good to be true?