7 Property operating expenses
2022 | 2021 | |
Taxes | 2,576 | 1,852 |
Insurance | 270 | 368 |
Maintenance | 5,467 | 5,320 |
Valuation fees | 106 | 83 |
Property management fees | 1,133 | 962 |
Letting and lease renewal fees | 1,222 | 1,096 |
Addition to / release from provision for doubtful debtors | 21 | -121 |
Non reclaimable VAT | 646 | 690 |
Business center expenses | 954 | 828 |
Association of owners | 1,109 | 345 |
Other operating expenses | 1,612 | 1,487 |
Total property operating expenses | 15,116 | 12,910 |
In 2022, € 0.6 million (2021: € 0.8 million) of the maintenance expenses related to unlet properties. The release from the provision for doubtful debtors in 2021 is primarily the result of tenants who ultimately paid outstanding amounts and discounts that have been granted to certain tenants.
The increase in costs for the association of owners is the result of the full year effect over 2022 of assets acquired in 2021. Other operating expenses relate to other operating expenses for the account of the Fund.