| | Buildings | Others | Total |
As at 1 January 2017 | 3 | 1 | 4 |
Investments | 2 | - | 2 |
Transfer from IPUC | 10 | - | 10 |
Disposal of former head office | (3) | - | (3) |
Revaluation | 1 | - | 1 |
As at 31 December 2017 | 13 | 1 | 14 |
| | | | |
Investments | 1 | 1 | 2 |
Transfer within PP&E | (2) | 2 | - |
Depreciations | (1) | (1) | (2) |
Revaluation | 2 | - | 2 |
As at 31 December 2018 | 13 | 3 | 16 |
The economic life of the head office of Vesteda in Amsterdam ‘De Boel’ is set at twenty-five years and the residual value amounts to €5 million. An independent valuation expert valued the building at fair value for an amount of €13 million. For the determination of the fair value, we refer you to the explanation provided in Note 4.
De Boel cost specification
Cost price de Boel: €11 million
Accumulated depreciation: €0 million
Accumulated revaluation: €2 million
Balance: €13 million
The investments made in 2018 are largely related to the fixtures & fittings (amortisation period of 10 years) and furniture (amortisation period of five years) for the new office.
The value of the other property, plant and equipment amounts to €3 million (2017: €1 million).
Other property, plant and equipment specification
Acquisition costs: €22 million
Cumulative depreciation: €19 million
Gross carrying amount: €3 million