Six Months
Ended
June 30, 2012

Six Months
Ended
June 30, 2011

Supplemental schedule of non-cash investing and financing activities:

Distribution payable on preferred units

$

4,798

$

452

Exchange of limited partnership units for general partnership units:

Limited partnership units

$

(2,469

)

$

(833

)

General partnership units

2,469

833

$

—

$

—

Write-off of fully depreciated assets

$

(23,135

)

$

(21,150

)

Mortgage loan payable assumed in conjunction with a property acquisition

$

(12,026

)

$

(24,417

)

Notes receivable issued in conjunction with certain property sales

$

—

$

1,029