11. Investment property

 31.12.201631.12.2015
Cost opening balance 25 252 31 921 
Reclassifications 3 664 1 635
Acquisition 4 646 -
Disposal (cost) (160) -
Sale of investment property - (7 017)
Other - (1 287)
Cost closing balance 33 402 25 252 
Opening balance of accumulated depreciation (3 754) (3 894)
Depreciation for the period (1 130) (763)
Reclassification (accumulated depreciation) (112) 251
Other (accumulated depreciation) 488 652
Closing balance of accumulated depreciation (4 508) (3 754)
Opening balance of impairment loss (874) (4 596)
Impairment loss (-) - 3 722
Closing balance of impairment loss  (874) (874)
Net carrying amount opening balance 20 624 23 431
Net carrying amount closing balance 28 020 20 624
 

No collateral has been established on investment property.

The income and expenses realized from investment property has beed presented below:

 31.12.201631.12.2015
Revenue from investment property 5 408 6 811
Operating costs related to investment property: (4 264) (4 859)

The Group recognizes as investment properties among others office buildings and other commercial properties.

The most valuable investment property is Enea S.A. former headquarter building, net carrying amount of PLN 9 119 thousand. The Group estimates fair value of this property at PLN 18 162 thousand.