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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
CenturyLink accounted for its indirect acquisition of us under the acquisition method of accounting, which requires the assignment of the purchase price to the assets acquired based on their fair values at the acquisition date.
Net property, plant and equipment is composed of the following:
 
 
 
Successor
 
Depreciable
Lives
 
December 31, 2013
 
December 31, 2012
 
 
 
(Dollars in millions)
Property, plant and equipment:
 
 
 
 
 
Land
N/A
 
$
356

 
356

Fiber, conduit and other outside plant(1)
15-45 years
 
4,033

 
3,475

Central office and other network electronics(2)
4-10 years
 
3,026

 
2,611

Support assets(3)
5-30 years
 
2,470

 
2,428

Construction in progress(4)
N/A
 
308

 
372

Gross property, plant and equipment
 
 
10,193

 
9,242

Accumulated depreciation
 
 
(2,985
)
 
(2,011
)
Net property, plant and equipment
 
 
$
7,208

 
7,231

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(1) 
Fiber, conduit and other outside plant consists of fiber and metallic cable, conduit, poles and other supporting structures.
(2) 
Central office and other network electronics consists of circuit and packet switches, routers, transmission electronics and electronics providing service to customers.
(3) 
Support assets consist of buildings, computers and other administrative and support equipment.
(4) 
Construction in progress includes inventory held for construction and property of the aforementioned categories that has not been placed in service as it is still under construction.
We recorded depreciation expense of $1.099 billion, $1.175 billion, $914 million, and $393 million for the successor years ended December 31, 2013 and 2012, the successor nine months ended December 31, 2011, and the predecessor three months ended March 31, 2011, respectively.
On April 2, 2012, we sold an office building for net proceeds of $133 million. As part of the transaction, we agreed to lease a portion of the building from the new owner. As a result, the $16 million gain from the sale was deferred and will be recognized as a reduction to rent expense over the 10 year lease term.