Is adjustable rate scary? Changes quarterly based on prime...

[Ellie Narie]

How scary is it to have an adjustable rate? Could it shoot up to 15% interest like back in the past? I'm getting a 100% financed sba loan for an office building, and their rate is adjustable. There are hefty early pay off penalties (several percent within the first few years), plus the building doesn't have 25% equity naturally, so it's not like I could refinance anyway. 

Should I be prepared for possible 10%+ interest rates?