One of the issues I address when writing a financial plan is that of diversification. And by this I mean diversification across asset classes. Of late I have had numerous conversations with worried “property” investors. Without exception diversification has not been considered at all. The narrow investment schemes (not financial plans) all share the same features;

1) All of their money is tied up in property.
2) All their property is residential.
3) All their residential properties are in the same city (and sometimes even on the same section or street!)

But wait: there is more, they have used the equity in their own home to buy these properties. This puts their own home at risk. Property is cyclical, just as other asset classes are cyclical. Why borrow money, secured against your home, to make a risky investment. Depending on who you listen to the property market will cool by 10-30%. I see mortgagee sales on the horizon that’s for sure.

Source:http://moneyaintitfunny.blogspot.com/2008/05/finance-and-investment.html