Other Comprehensive Income of the Operating Partnership

3 Months Ended

Mar. 31, 2012

Other Comprehensive Income [Line Items]

Comprehensive Income (Loss) Note [Text Block]

Other Comprehensive Income of the Trust

The functional currency of the Trust's United Kingdom operations is pounds sterling. The Trust translates the financial statements for the United Kingdom operations into US dollars. Gains and losses resulting from this translation are included in comprehensive income and are included in accumulated other comprehensive income (loss) as a separate component of equity. A proportionate amount of gain or loss is allocated to noncontrolling interest-common units. Accumulated other comprehensive income (loss) consists solely of the foreign currency translation adjustments described above. Upon sale or upon complete or substantially complete liquidation of the Trust's foreign investment, the gain or loss on the sale will include the cumulative translation adjustments that have been previously recorded in accumulated other comprehensive income (loss) and noncontrolling interest-common units.

Liberty Property Limited Partnership [Member]

Other Comprehensive Income [Line Items]

Comprehensive Income (Loss) Note [Text Block]

Other Comprehensive Income of the Operating Partnership

The functional currency of the Operating Partnership’s United Kingdom operations is pounds sterling. The Operating Partnership translates the financial statements for the United Kingdom operations into US dollars. Gains and losses resulting from this translation are included in other comprehensive income within general partner’s equity – common units and limited partners’ equity-common units. Upon sale or upon complete or substantially complete liquidation of the Operating Partnership's foreign investment, the gain or loss on the sale will include the cumulative translation adjustments that have been previously recorded in general partner’s equity-common units and limited partners’ equity – common units.