15. Other non-current receivables

Other loans to associates

The other loans to associates include a loan of 5.3 million euros to SRE Altaï, which is a joint venture with Groupe ADP involving collaboration in the area of property development. The maturity date of the loan is 31 December 2024 and no securities have been granted. The current portion of the loans to associates, amounting to 0.6 million euros (31 December 2017: 0.8 million euros), is presented under current assets.

Purchased long leases are the rent instalments which Schiphol Group paid in advance in respect of land acquired on a long lease.

Lease incentives are the cost of benefits which Schiphol Group granted tenants at the start of their lease. These are charged to the income statement over the term of the underlying contracts. The existence of lease incentives is taken into account in establishing the cash flows underlying the determination of the fair value of property.

The other non-current receivables include an amount of 19.0 million euros which Schiphol Group paid to Chipshol in 2007, for which additional guarantees have been granted. This receivable was previously reported under trade and other receivables.

For information on derivatives, see note 29. Management of financial risks and financial instruments.