Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

29. Tenant Concentrations (Details)

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29. Tenant Concentrations (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Microelettrica [Member]      
Disclosure of offsetting of financial assets [line items]      
Group's annual rental revenue 59.61% 59.53% [1] 59.62% [1]
[1] Restated for discontinued operations (see note 9 - Discontinued Operations).