6 Property operating expenses
| | 2015 | 2014 |
Taxes | 73 | 54 |
Insurance | 10 | 5 |
Maintenance | 28 | 28 |
Valuation fees | 39 | 21 |
Property management fees | 9 | 11 |
Letting and lease renewal fees | 23 | 12 |
Other operating expenses | 72 | 133 |
Addition to provision for bad debts | - | 8 |
Total property operating expenses | 254 | 272 |
In 2015, € 2 thousand (2014: € 2 thousand) of the maintenance expenses related to unlet properties.