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Investments in real estate
9 Months Ended
Sep. 30, 2023
Real Estate [Abstract]  
Investments in real estate
Our consolidated investments in real estate, including real estate assets classified as held for sale as described in Note 15 – “Assets classified as held for sale” to our unaudited consolidated financial statements, consisted of the following as of September 30, 2023 and December 31, 2022 (in thousands):

September 30, 2023December 31, 2022
Rental properties:
Land (related to rental properties)$4,424,245 $4,284,731 
Buildings and building improvements19,486,528 18,605,627 
Other improvements3,137,310 2,677,763 
Rental properties27,048,083 25,568,121 
Development and redevelopment projects9,516,928 8,715,335 
Gross investments in real estate – North America36,565,011 34,283,456 
Less: accumulated depreciation – North America(4,852,280)(4,349,780)
Net investments in real estate – North America
31,712,731 29,933,676 
Net investments in real estate – Asia
— 11,764 
Investments in real estate$31,712,731 $29,945,440 
Acquisitions

Our real estate asset acquisitions during the nine months ended September 30, 2023 consisted of the following (dollars in thousands):

Square Footage
MarketNumber of PropertiesFuture DevelopmentActive Development/RedevelopmentOperating With Future Development/Redevelopment
Purchase Price(1)
Canada1— — 247,743 $100,837 
Other2715,000 110,717 10,000 71,103 
Three months ended March 31, 2023
3715,000 110,717 257,743 171,940 
Other374,349 — — 54,000 
Three months ended June 30, 2023
374,349 — — 54,000 
Other2— — 175,676 25,036 
Three months ended September 30, 2023
2— — 175,676 25,036 
Nine months ended September 30, 202351,089,349 110,717 433,419 $250,976 
(1)
(1)Represents the aggregate contractual purchase price of our acquisitions, which differs from purchases of real estate in our unaudited consolidated statements of cash flows due to the timing of payment, closing costs, and other acquisition adjustments such as prorations of rents and expenses.


Based upon our evaluation of each acquisition, we determined that substantially all of the fair value related to each acquisition was concentrated in a single identifiable asset or a group of similar identifiable assets or was associated with a land parcel with no operations. Accordingly, each transaction did not meet the definition of a business and therefore was accounted for as an asset acquisition. In each of these transactions, we allocated the total consideration for each acquisition to the individual assets and liabilities acquired on a relative fair value basis.

During the nine months ended September 30, 2023, we acquired five properties for an aggregate purchase price of $251.0 million. In connection with our acquisitions, we recorded in-place lease assets aggregating $15.3 million and below-market lease liabilities in which we are the lessor aggregating $5.8 million. As of September 30, 2023, the weighted-average amortization period remaining on our in-place leases and below-market leases acquired during the nine months ended September 30, 2023 was 3.5 years and 2.3 years, respectively, and 3.2 years in total.
Sales of real estate assets and impairment charges

Our completed dispositions of and sales of partial interests in real estate assets during the nine months ended September 30, 2023 consisted of the following (dollars in thousands):
Gain on Sales of Real Estate
Consideration Above/(Below) Book Value(1)
PropertySubmarket/MarketDate of SaleInterest SoldRSFSales Price
Partial interest sales(2):
9625 Towne Centre Drive
University Town Center/
San Diego
6/21/2320.1 %163,648 $32,261 N/A$15,553 
15 Necco StreetSeaport Innovation District/Greater Boston4/11/2318 %345,995 66,108 N/A(7,761)
98,369 $7,792 
Dispositions of real estate:
225, 231, 266, and 275 Second Avenue and 780 and 790 Memorial DriveRoute 128 and Cambridge/Inner Suburbs/Greater Boston6/13/23100 %428,663 365,226 $187,225 
11119 North Torrey Pines RoadTorrey Pines/San Diego5/4/23100 %72,506 86,000 27,585 
451,226 $214,810 
421 Park Drive(3)
Fenway/Greater Boston9/19/23
(3)
(3)
174,412 $— 
275 Grove StreetRoute 128/Greater Boston6/27/23100 %509,702 109,349 
(4)
Other42,092 $— 
$875,448 
(5)
(1)Related to sales of partial interests in real estate assets over which we retained control and therefore continue to consolidate. We recognized the difference between the consideration received and the book value of partial interests sold in additional paid-in capital, with no gain or loss recognized in earnings.
(2)Refer to the “Sales of partial interests” section in Note 4 – “Consolidated and unconsolidated real estate joint ventures” to our unaudited consolidated financial statements for additional information.
(3)Represents the disposition of 268,023 RSF in a 660,034 RSF near-term development at 421 Park Drive. The proceeds from this transaction will help fund the construction of our remaining 392,011 RSF of the project. The buyer will fund the remaining costs to construct its 268,023 RSF, and these costs are not included in our projected construction spending. We will develop and operate the completed project and will earn development fees over the next three years.
(4)Refer to the “Impairment charges” section below for information related to impairment charges recognized in connection with this transaction.
(5)Represents the aggregate contractual sales price of our sales, which differs from proceeds from sales of real estate and contributions from and sales of noncontrolling interests in our consolidated statements of cash flows under “Investing activities” and “Financing activities,” respectively, primarily due to the timing of payment, closing costs, and other sales adjustments such as prorations of rents and expenses.

Impairment charges

During the nine months ended September 30, 2023, we recognized impairment charges aggregating $189.2 million primarily consisting of the following:

In January 2020, we acquired a three-building office campus aggregating 509,702 RSF at 275 Grove Street in our Route 128 submarket. At the time of our acquisition, the campus was fully occupied with a weighted-average remaining lease term of 6.1 years. We had intended to convert the campus into laboratory space through redevelopment upon the expiration of the acquired in-place leases. Since our acquisition, the macroeconomic environment and demand for office space have deteriorated considerably. In April 2023, upon meeting the criteria for classification as held for sale, we recognized a real estate impairment charge aggregating $138.9 million to reduce our investment in this campus to its estimated fair value less costs to sell. In June 2023, we recognized an additional impairment adjustment of $6.5 million to reduce the carrying amount of this asset to its updated fair value less costs to sell. These impairment charges aggregating $145.4 million were classified in impairment of real estate in our consolidated statement of operations. We completed the sale in June 2023 with no gain or loss recognized in earnings.

During the three months ended June 30, 2023, we recognized a real estate impairment charge aggregating $17.1 million to fully write down the carrying amount of our one remaining property in Asia.
During the three months ended September 30, 2023, we recognized real estate impairment charges aggregating $20.6 million to further reduce the carrying amounts of primarily three non-laboratory properties classified as held for sale aggregating 230,704 RSF, located in our Greater Boston and Texas markets, to their respective estimated fair values less costs to sell. These assets represent non-core properties that are not integral to our mega campus strategy. Refer to Note 15 – “Assets classified as held for sale” to our unaudited consolidated financial statements for additional information.