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Investment properties | 12 Months Ended
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Dec. 31, 2021
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Investment properties | 15. Investment properties ​
​ | ​ | ​ | ​ | ​
​ |  | 31 December |  | 31 December
​ | ​ | 2021 | ​ | 2020
Cost | ​ | ​ | ​ | ​
Opening balance |  | 37,079 |  | 46,283
Addition |  | — |  | —
Disposal | ​ | — | ​ | (15,985)
Transfer to property, plant and equipment |  | 14,021 |  | 6,781
Closing balance |  | 51,100 |  | 37,079
Accumulated depreciation |  | ​ |  |
Opening balance |  | (23,404) |  | (30,000)
Transfer to property, plant and equipment |  | (9,999) |  | (5,528)
Depreciation and impairment charges during the year |  | (1,109) |  | (697)
Disposal | ​ | — | ​ | 12,821
Closing balance |  | (34,512) |  | (23,404)
​ | ​ | ​ | ​ | ​
Net book amount | ​ | 16,588 |  | 13,675
​ Determination of the fair values of the Group’s investment properties The Group engages qualified external experts, authorized by the Capital Markets Board of Turkey, to perform the valuation of investment properties. Management works closely with the qualified external experts to establish the appropriate valuation techniques and inputs to the model. The fair values of these investment properties were determined using a variety of valuation methods: income capitalization approach and market approach. In estimating the fair values of the properties, the highest and best use of the property is its current use. Rent income from investment properties during the year ended 31 December 2021 is TL 6,872 (31 December 2020: TL 5,855 and 31 December 2019: TL 4,078). There is no direct operating expense for investment properties during the year ended 31 December 2021 (31 December 2020: TL 294 and 31 December 2019: 522). 15. Investment properties (continued) ​ Determination of the fair values of the Group’s investment properties ​ The Group’s investment properties and their fair values at 31 December 2021 and 2020 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
31 December 2021 |  | Level 1 |  | Level 2 |  | Level 3 |  | Valuation Method
Investment properties in Gebze | ​ | — | ​ | — | ​ | 52,725 | ​ | Income capitalization approach
Investment properties in Ankara | ​ | — |  | 32,315 |  | — |  | Market approach
Investment properties in Istanbul | ​ | — | ​ | 6,705 | ​ | — | ​ | Market approach
Investment properties in Adana | ​ | — |  | 3,765 |  | — |  | Market approach
Investment properties in Aydin | ​ | — | ​ | 3,600 | ​ | — | ​ | Market approach
​ | ​ | — | ​ | 46,385 | ​ | 52,725 | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
31 December 2020 |  | Level 1 |  | Level 2 |  | Level 3 |  | Valuation Method
Investment properties in Gebze | ​ | — | ​ | — | ​ | 22,340 | ​ | Income capitalization approach
Investment properties in Ankara |  | — |  | 15,160 |  | — |  | Market approach
Investment properties in Aydin |  | — |  | 2,515 |  | — |  | Market approach
​ |  | — |  | 17,675 |  | 22,340 | ​ | ​
​ Significant unobservable inputs and sensitivity of fair values of respective investment properties are as follows: In the “income capitalization” approach, a significant increase/(decrease) in rentals will cause a significant increase/(decrease) in the fair value. In addition, a slight decrease/(increase) in risk premium and discount rate which are calculated by considering current market conditions will cause a significant increase/(decrease) in the fair value. In the “market approach”, a significant increase/(decrease) in the market value of any properties which are located in similar areas with similar conditions will cause a significant increase/(decrease) in the fair value.

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- Definition The entire disclosure for investment property. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2021-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&doctype=Standard&dita_xref=IAS40_g74-79_TI -URIDate 2021-03-24 + Details
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