Significant Acquisitions and Dispositions

Acquisitions and dispositions during the years ended December 31, 2012, 2011 and 2010 were completed in accordance with our strategy to reposition our investment concentration among product types and further diversify our geographic presence. With the exception of certain properties that have been sold or classified as held for sale, the results of operations for all acquired properties have been included in continuing operations within our consolidated financial statements since their respective dates of acquisition.

2012 Acquisitions

We acquired 37 operating properties during the year ended December 31, 2012. These acquisitions consisted of three industrial properties near Chicago, Illinois, two industrial properties in Columbus, Ohio, one industrial property in Southern California, two industrial properties in Northern California, one industrial property in Atlanta, Georgia, one industrial property in Houston, Texas and 27 medical office properties in various markets. The following table summarizes our allocation of the fair value of amounts recognized for each major class of asset and liability (in thousands) for these acquisitions:




Real estate assets	$	668,149
Lease-related intangible assets	111,509
Other assets	5,714
Total acquired assets	785,372
Secured debt	100,826
Other liabilities	11,928
Total assumed liabilities	112,754
Fair value of acquired net assets	$	672,618

The leases in the acquired properties had a weighted average remaining life at acquisition of approximately 8.8 years.

2010 and 2011 Acquisitions of Premier Portfolio

We purchased twelve industrial and four office buildings, as well as other real estate assets, during the year ended December 31, 2011. These purchases completed our acquisition of a portfolio of buildings in South Florida (the "Premier Portfolio"), which was placed under contract in 2010, and resulted in cash payments to the sellers of $27.4 million, the assumption of secured loans with a face value of $124.4 million and the issuance to the sellers of 2.1 million Units with a fair value at issuance of $28.4 million (Note 11). These Units were converted to shares of the General Partner in early 2012, after a mandatory one-year holding period.

On December 30, 2010, we purchased 38 industrial buildings, one office building and other real estate assets within the Premier Portfolio.

The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities related to the 55 properties and other real estate assets from the Premier Portfolio that have been purchased through December 31, 2011 (in thousands):



	Acquired During Year Ended December 31, 2011		Acquired During Year Ended December 31, 2010		Total
Real estate assets	$	153,656	$	249,960	$	403,616
Lease-related intangible assets	25,445		31,091		56,536
Other assets	2,571		1,801		4,372
Total acquired assets	181,672		282,852		464,524
Secured debt	125,003		158,238		283,241
Other liabilities	4,284		4,075		8,359
Total assumed liabilities	129,287		162,313		291,600
Fair value of acquired net assets	$	52,385	$	120,539	$	172,924

The leases in the acquired properties had a weighted average remaining life at acquisition of approximately 3.5 years.

Other 2011 Acquisitions

In addition to our acquisition of the remaining properties in the Premier portfolio, we also acquired 43 properties during the year ended December 31, 2011. These acquisitions consisted of twelve bulk industrial properties in Chicago, Illinois, six bulk industrial properties in Raleigh, North Carolina, three bulk industrial properties in Dallas, Texas, three bulk industrial properties in Minneapolis, Minnesota, two bulk industrial properties in Southern California, one bulk industrial property in Phoenix, Arizona, one bulk industrial property in Savannah, Georgia, one bulk industrial property in Indianapolis, Indiana, one office property in Raleigh, North Carolina, one office property in Indianapolis, Indiana, one office property in Atlanta, Georgia and eleven medical office properties in various markets. The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands) for these acquisitions:



Real estate assets	$	503,556
Lease-related intangible assets	70,994
Other assets	879
Total acquired assets	575,429
Secured debt	40,072
Other liabilities	8,300
Total assumed liabilities	48,372
Fair value of acquired net assets	$	527,057

The leases in the acquired properties had a weighted average remaining life at acquisition of approximately 6.7 years.

2010 Acquisition of Remaining Interest in Dugan Realty, L.L.C.

On July 1, 2010, we acquired our joint venture partner's 50% interest in Dugan Realty, L.L.C. ("Dugan"), a real estate joint venture that we had previously accounted for using the equity method, for a payment of $166.7 million. Dugan held $28.1 million of cash at the time of acquisition, which resulted in a net cash outlay of $138.6 million. As the result of this transaction we obtained all of Dugan's membership interests.

At the date of acquisition, Dugan owned 106 industrial buildings totaling 20.8 million square feet and 63 net acres of undeveloped land located in Midwest and Southeast markets. Dugan had a secured loan with a face value of $195.4 million due in October 2010 and a secured loan with a face value of $87.6 million due in October 2012, which were both repaid at their scheduled maturity dates (see Note 7).

The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):



Real estate assets	$	502,418
Lease-related intangible assets	107,155
Other assets	28,658
Total acquired assets	638,231
Secured debt	285,376
Other liabilities	20,243
Total assumed liabilities	305,619
Fair value of acquired net assets (represents 100% interest)	$	332,612

We previously managed and performed other ancillary services for Dugan's properties and, as a result, Dugan had no employees of its own and no separately recognizable brand identity. As such, we determined that the consideration paid to the seller, plus the fair value of the incremental share of the assumed liabilities, represented the fair value of the additional interest in Dugan that we acquired, and that no goodwill or other non-real estate related intangible assets were required to be recognized through the transaction. Accordingly, we also determined that the fair value of the acquired ownership interest in Dugan equaled the fair value of our existing ownership interest.

In conjunction with acquiring our partner's ownership interest in Dugan, we derecognized a $50.0 million liability related to a put option held by our partners. The put liability was originally recognized in October 2000, in connection with a sale of industrial properties and undeveloped land to Dugan, at which point our joint venture partner was given an option to put up to $50.0 million of its interest in Dugan to us in exchange for the General Partner's common stock or cash (at our option). Our gain on acquisition, considering the derecognition of the put liability, was calculated as follows (in thousands):



Fair value of existing interest (represents 50% interest)	$	166,306
Less:
Carrying value of investment in Dugan	158,591
Put option liability derecognized	(50,000		)
	108,591

Gain on acquisition	$	57,715

Other 2010 Acquisitions

In addition to the 39 Premier Portfolio properties acquired in 2010 as discussed above, and the acquisition of our partner's ownership interest in Dugan, we also acquired 13 additional properties during the year ended December 31, 2010. These acquisitions consisted of three bulk industrial properties in Houston, Texas, two bulk industrial and two office properties in South Florida, two bulk industrial properties in Chicago, Illinois, one bulk industrial property in Phoenix, Arizona, one bulk industrial property in Nashville, Tennessee, one bulk industrial property in Columbus, Ohio, and one medical office property in Charlotte, North Carolina.

The following table summarizes our allocation of the fair value of amounts recognized for each major class of assets and liabilities (in thousands):



Real estate assets	$	254,014
Lease-related intangible assets	71,844
Other assets	3,652
Total acquired assets	329,510
Secured and unsecured debt	63,458
Other liabilities	5,645
Total assumed liabilities	69,103
Fair value of acquired net assets	$	260,407

Fair Value Measurements

The fair value estimates used in allocating the aggregate purchase price of each acquisition among the individual components of real estate assets and liabilities were determined primarily through calculating the "as-if vacant" value of each building, using the income approach, and relied significantly upon internally determined assumptions. We have determined these estimates to have been primarily based upon Level 3 inputs, which are unobservable inputs based on our own assumptions. The range of most significant assumptions utilized in making the lease-up and future disposition estimates used in calculating the "as-if vacant" value of each building acquired during 2012 and 2011 are as follows:



	2012		2011
	Low	High	Low	High
Discount rate	7.13%	10.78%	6.40%	11.10%
Exit capitalization rate	5.75%	8.88%	4.80%	10.00%
Lease-up period (months)	6	36	9	36
Net rental rate per square foot - Industrial	$2.75	$7.62	$2.75	$6.70
Net rental rate per square foot - Office	$—	$—	$8.61	$16.00
Net rental rate per square foot - Medical Office	$13.20	$26.14	$13.75	$27.62

Acquisition-Related Activity

The acquisition-related activity in our consolidated Statements of Operations includes transaction costs for completed acquisitions, which are expensed as incurred, as well as gains or losses related to acquisitions where we had a pre-existing ownership interest. Acquisition-related activity for the years ended December 31, 2012, 2011 and 2010 includes transaction costs of $4.2 million, $2.3 million and $1.9 million, respectively.

Dispositions

We disposed of income-producing real estate assets and undeveloped land and received net proceeds of $138.1 million, $1.57 billion and $499.5 million in 2012, 2011 and 2010, respectively.

Included in the building dispositions in 2011 is the sale of substantially all of our wholly-owned suburban office real estate properties in Atlanta, Chicago, Columbus, Dallas, Minneapolis, Orlando and Tampa, consisting of 79 buildings that had an aggregate of 9.8 million square feet to affiliates of Blackstone Real Estate Partners. The sales price was approximately $1.06 billion which, after settlement of certain working capital items and the payment of applicable transaction costs, was received in a combination of approximately $1.02 billion in cash and the assumption by the buyer of mortgage debt with a face value of approximately $24.9 million.

Also included in the building dispositions in 2011 is the sale of 13 suburban office buildings, totaling over 2.0 million square feet, to an existing 20%-owned unconsolidated joint venture. These buildings were sold to the unconsolidated joint venture for an agreed value of $342.8 million, of which our 80% share of proceeds totaled $273.7 million. Included in the building dispositions in 2010 is the sale of seven suburban office buildings, totaling over 1.0 million square feet, to the same 20%-owned joint venture. These buildings were sold to the unconsolidated joint venture for an agreed value of $173.9 million, of which our 80% share of proceeds totaled $139.1 million.

All other dispositions were not individually material.