It depends on the considered risk of your business. Unlike a normal mortgage where you have a secure job and/or health (age) to continue working, a business mortgage relies on the business to repay the loan. For example, a freehold pub is now a high risk because as we all know, pubs are failing at a very high rate.
Business mortgage rates vary greatly, so well worth shopping around. Your business plan will also have an enormous influence on the rate - so make sure it looks professional..
When I got a mortgage for my first pub, I put forward a business plan with a forecast of a 'worse case scenario' showing that I could still afford the mortgage on expected minimal trade. I did an expected income based on five punters on average in the pub spending £X per hour. The bank manager (it'll be a business manager now) told me that he was impressed but could not allow the loan. He suggested I came back and saw him in two days but to make the 'worse case' figures seven people spending £2X. I did and it got approved!
So the finance world is one big gamble for them and you. Good luck .... and dress smart with a decent haircut ;-)