Because you don't know if the building is even there, perhaps? Or remember in 2008 when by 2010 properties were often sold for well under half what was lent against them? Or, like one REO I valued, the entire house was filled with trash bags, a storage shed was full of trash bags, many broken, and even an abandoned truck there was filled both the bed and cab with trash bags. Sometimes it helps to have eyes on the prize. In the old days when people dealt with real banks and real bankers regulated by the FDIC or OCC, and not mortgage originators or online lenders, bankers themselves often visited their borrowers and looked for themselves. That was especially true of rent properties, farms and commercial. Bankers often spent an afternoon each week just checking on the loans they had, performing or not.