Advantages Of A Commercial Second Mortgage By admin | August 3, 2008 A commercial second mortgage is an important commercial real estate tool. While commercial second mortgages can be critical in some financing scenarios, consideration must be given as to whether or not you have the Commercial second mortgages are often used in conjunction with a new first commercial mortgage loan. Typically, the commercial second mortgage will have a term of one to five years with interest only payments. Low mortgage rates in turn lead to bigger savings from your monthly payments. And with a refinance mortgage loan, you can take advantage of this basic financing concept and reduce your monthly repayments while at the same time, increase your monthly savings.