Depreciation really depends on when you buy and when you plan to sell. Here are real representative figures for a couple of housing options over a long multi-cycle period in the Old City of Toronto using 1981 as a cost base:
Condo:
1981 value $42,000
2009 inflation adjusted value $95,800
2009 real value $130,000
House on average street:
1981 value $74,800
2009 inflation adjusted value $155,584
2009 real value $675,000
House on better street:
1981 value $170,000
2009 inflation adjusted value $353,600
2009 real value $975,000
So over almost 29 years the condo appreciated about 1% above inflation per year, the average house appreciated 5.2% and the better house appreciated 3.6%. Location and upkeep etc. are obvious factors but these numbers are fairly reflective. So it seems that over time a given condo can appreciate (in terms of value, we won't mention escalating condo fees). Note however that the unique demographics and period of city maturing that occured during this 29 year period likely means these numbers will shift down moving forward. I suspect more than 1 percent, which may put long-term condo appreciation in serious question.