Totally depends on the bank. The lending market right now is changing a lot- daily. You can still get 100% financing for investment properties, but you'll pay through the nose for it. For an investment property banks generally want anywhere from 0-30% down.

I just got 10% down a couple of months ago- but I had to call several banks. ...As a general rule of thumb, keep asking until you get the answer you want. ...My first home, I went to over 13 different banks before I was approved for the rate, terms and amount I wanted. The lesson: "Never, never, never give up". (McArthur?)