I am looking at buying a property which I thought would be cash flow positive. However, I've been told that after depreciation, it'll be slightly negative. What I don't understand is why this is the case. I know the building depreciates, but as a whole, properties tend to appreciate in value. Therefore I don't understand how depreciation is a cost. In fact, I thought depreciation is a 'good thing' for investors, because it can be claimed as a deduction?