In debating these numbers, parties have to look at the actual historical numbers for the property, the quality of management and the impact of a management or ownership change on those numbers, and what is going on in the marketplace. This applies not only to income and expenses from operation, but in ultimate disposition values as well. Real estate can be particularly challenging, as tax, utility and repair costs can be hard to predict and beyond ownership control, and there are a number of factors from the marketplace with affect vacancy rates or tenant based risks. Added.