When we take up a certain loan from a recognized private lender, we incur some or one other costs or fees. In case of tenement, this becomes possible only when it is used for residence, too as business purposes. As long because the business entity generates enough cash to pay back interest on loans so they cover all of its day-to-day expenses, it can be classified as a sustainable business.
However as a lender you will definitely take dilemma that what you can do? Though, you is likely to be quite very happy to note that you've some options such cases as well.