Should I sell my $565,000 duplex and invest the money — or continue to collect rent?

[NewsFeeder]

Should I sell my $565,000 duplex and invest the money — or continue to collect rent?

This retiree is 60, has no debt and owns two other properties.

http://finance.yahoo.com/r/47320077...23256C0DBF&siteid=yhoof2&yptr=yahoo&.tsrc=rss