Repayment Personal Loan w/ no interest investment property

How are repayments of a personal loan w/ no interest treated. Is it an operating expense?

 

Ex. I borrow 100K to buy property X.  The property generates 100K in revenue.

All expenses (insurance, utilities, etc) are 40K.

Throughout the year I repay 20K of the personal loan back (there is no interest). Is that treated an expense on the property in addition to all the other expenses? So I have 60K for expenses. If not, how is it treated?