A friend owns a Flat in building shown (top right apartment), and as you can see ugly black molding, more than one year later and no signs of exterior cleaning. This resident building is located in the best area of a major city in Brazil and monthly maintenance fees run him $400.00us -/+. His complaints are responded with 'em breve, em breve'. That said, let this serve as a lesson to be sure the maintenance company performs required diligent duties consistently as outlined in the maintenance contract. Otherwise, you’ll have no recourse and your real estate investment could depreciate. Exterior pressure cleaning is cheap and should be performed at least once a year.