7 Property operating expenses
| | 2015 | 2014 |
Taxes | 1,342 | 1,162 |
Insurance | 115 | 80 |
Maintenance | 946 | 751 |
Valuation fees | 142 | 166 |
Property management fees | 775 | 715 |
Promotion and marketing | 212 | 165 |
Letting and lease renewal fees | 482 | 296 |
Other operating expenses | 857 | 949 |
Addition to provision for bad debts | 198 | 347 |
Total property operating expenses | 5,069 | 4,631 |
In 2015, € 0.1 million (2014: € 0.2 million) of the maintenance expenses related to unlet properties.