Why did HCP stock rise 3 dollars in a week?

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5 days ago stock for the Healthcare Property Investment Inc was around $34.70, but now it is at $37.26 as of me writing this.

I don't know much about the company, but was looking into it because it popped up on S&P 500's Dividend Aristocrats and if I remember correctly it pays around 6.7% dividend, so it is quite good, however I have read predictions on various websites saying it isn't a safe investment, and have yet to do my own research, then suddenly it rises nearly 3 dollars in value in less than a week.

http://www.hcpi.com/
http://ir.hcpi.com/company-overview
http://finance.yahoo.com/quote/HCP?ltr=1

If anybody has info I'd be glad, this could have been a good investment 5 days ago, and I would like to know what triggered it's rise.

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