6 Property operating expenses
| | 2016 | 2015 |
Taxes | 51 | 73 |
Insurance | 7 | 10 |
Maintenance | 1 | 28 |
Valuation fees | 22 | 39 |
Property management fees | 2 | 9 |
Letting and lease renewal fees | - | 23 |
Other operating expenses | 97 | 72 |
Addition to provision for bad debts | - | - |
Total property operating expenses | 180 | 254 |
In 2016, nil (2015: € 2 thousand) of the maintenance expenses related to unlet properties.