Commercial Loan Requirements 150 000 mortgage payment How will the interest rate rise affect my mortgage and savings? – An owner with the typical mortgage in Britain of £175,000 will see their monthly payments increase by £22. A 0.25% increase would add £21 a month to the average £150,000 mortgage. For owners currently.Commercial Property Loan: Everything You Need To Know – Choosing a lender Getting a commercial property loan approved. The method that banks use to assess commercial property loans is extremely complicated as each application and security property is unique.