In the "Home Office" section, it is asking for the Mortgage Amount and asks for the amount in BOX 1. We have a small business. Do I put the WHOLE amount in this box or %

In the "Home Office" section for the business deductions, it is asking for the Mortgage Amount and asks for the amount in BOX 1. 

We have a small business. My portion of the business is 51% and the Wife is 49%. Do I put the WHOLE amount in this box (that is the way it reads) or do I put in each persons portion?