Income property interest rate

[Duke Vang]

So I got out of class last night and my professor was telling me that, in order to do an income(investment) property, you will be charged with a higher interest rate compared to a property that you would finance for yourself. So here in Sacramento, CA it is 3.5% at the moment I believe. If I do an income property, how much would my interest rate be and i don't know how points work as well. On top of that, will I have to do a 20% down all the time when doing income property? Can someone help me a bit? I'm having doubts and trouble.