Buying the tenant's sob storiesGiving more than one payment plan to a tenantDoing the "cheap fix" instead of getting it done right the first timeAccepting poor quality work from a contractor or employeeNot focusing on accounting or hiring a bad bookkeeper (I've seen this one more times than I can count)Not documenting calls and communications with tenantsNot keeping your paperwork in orderAllowing tenant's problems to become your problemsReally, the list is almost endless