weighted (by rentable square feet) average lease term of 9.3 years and we made commitments for $173,419 of leasing related costs. As of December 31, 2022, we had estimated unspent leasing related obligations of $156,693.

During the year ended December 31, 2021, we acquired three properties containing approximately 926,000 rentable square feet for an aggregate purchase price of $576,478, including net purchase price adjustments of $1,761 and acquisition related costs of $1,264. These acquisitions were accounted for as asset acquisitions. We allocated the purchase prices of these acquisitions based on the relative estimated fair values of the acquired assets and assumed liabilities as follows:


Acquisition Date	Location	Number of Properties	Rentable Square Feet	Purchase Price		Land		Buildings and Improvements		Acquired Real Estate Leases		Assumed Real Estate Lease Obligations
June 2021	Chicago, IL (1)	1	531,000	$	368,331	$	42,935	$	258,348	$	76,136	$	(9,088)
June 2021	Atlanta, GA	1	346,000	180,602		13,040		135,459		32,103		—
August 2021	Boston, MA	1	49,000	27,545		16,103		10,217		1,225		—












		3	926,000	$	576,478	$	72,078	$	404,024	$	109,464	$	(9,088)

During the year ended December 31, 2020, we acquired two properties containing approximately 163,000 rentable square feet for an aggregate purchase price of $47,215, including capitalized acquisition related costs of $590. These acquisitions were accounted for as asset acquisitions. We allocated the purchase prices of these acquisitions based on the relative estimated fair values of the acquired assets as follows:


Acquisition Date	Location	Number of Properties	Rentable Square Feet	Purchase Price		Land		Buildings and Improvements		Acquired Real Estate Leases
February 2020	Boston, MA	1	13,000	$	11,864	$	2,618	$	9,246	$	—
December 2020	Fort Mill, SC	1	150,000	35,351		5,031		22,526		7,794

		2	163,000	$	47,215	$	7,649	$	31,772	$	7,794

The sales completed during the years ended December 31, 2022, 2021 and 2020, as presented in the tables below, do not represent significant dispositions individually or in the aggregate, nor do they represent a strategic shift in our business. As a result, the results of operations of these properties are included in continuing operations through the date of sale in our consolidated statements of comprehensive income (loss).

During the year ended December 31, 2022, we sold 18 properties containing approximately 2,326,000 rentable square feet for an aggregate sales price of $211,020, excluding closing costs.


Date of Sale	Number of Properties	Location	Rentable Square Feet	Gross Sales Price (1)		Gain (Loss) on Sale of Real Estate		Loss on Impairment of Real Estate
January 2022	1	Rockville, MD (2)	129,000	$	6,750	$	(72)	$	—
February 2022	2	Chesapeake, VA (2)	172,000	18,945		2,296		—
March 2022	1	Milwaukee, WI (2)	29,000	3,775		(75)		—
May 2022	1	Holtsville, NY	264,000	28,500		1,900		—
June 2022	1	Fairfax, VA	184,000	19,750		(13,537)		—
July 2022	1	Houston, TX	206,000	9,800		(135)		15,278
August 2022	3	Birmingham, AL	448,000	16,050		(265)		3,709
August 2022	1	Erlanger, KY	86,000	2,600		135		2,184
September 2022	2	Chesapeake, VA	214,000	24,000		62		649
September 2022	2	Everett, WA	112,000	31,500		11,959		—
September 2022	1	Salem, OR	233,000	34,250		5,369		—
November 2022	1	Kapolei, HI (3)	109,000	4,000		2,504		—
November 2022	1	Englewood, CO	140,000	11,100		860		—
	18		2,326,000	$	211,020	$	11,001	$	21,820

As of December 31, 2022, we had three properties located in Richmond, VA containing approximately 89,000 rentable square feet classified as held for sale in our consolidated balance sheets. These properties were sold in January 2023 for a sales price of $5,350, excluding closing costs.

As of February 14, 2023, we have entered into agreements to sell two properties containing approximately 207,000 rentable square feet for an aggregate sales price of $7,600, excluding closing costs. These pending sales are subject to conditions, accordingly, we cannot be sure that we will complete these sales or that these sales will not be delayed or the terms will not change.

During the year ended December 31, 2021, we sold six properties, a warehouse facility and two vacant land parcels containing approximately 2,565,000 rentable square feet for an aggregate sales price of $226,915, excluding closing costs.


Date of Sale	Number of Properties	Location	Rentable Square Feet	Gross Sales Price (1)		Gain (Loss) on Sale of Real Estate		Loss on Impairment of Real Estate
January 2021	—	Kansas City, MO (2) (3)	10,000	$	845	$	(63)	$	—
January 2021	1	Richmond, VA (2)	311,000	130,000		54,181		—
April 2021	1	Huntsville, AL	1,371,000	39,000		—		5,383
July 2021	1	Fresno, CA	532,000	6,000		—		33,902
July 2021	1	Liverpool, NY	38,000	650		31		—
August 2021	1	Memphis, TN	205,000	15,270		287		—
September 2021	1	Stoneham, MA	98,000	6,650		(282)		5,911
October 2021	—	Sterling, VA (4)	—	28,500		24,200		—







	6		2,565,000	$	226,915	$	78,354	$	45,196

We also recorded a $10,658 loss on impairment of real estate to reduce the carrying value of three properties that were classified as held for sale to their estimated fair values less costs to sell as of September 30, 2021. Subsequently, we removed these properties from held for sale status due to a change of plan for sale and recorded an impairment adjustment of $425 to increase the carrying value of these properties to their estimated fair value as of December 31, 2021. In addition, we recorded a $6,991 loss on impairment of real estate to reduce the carrying value of two properties that were classified as held for sale as of December 31, 2021 and subsequently sold in 2022.

During the year ended December 31, 2020, we sold 10 properties containing approximately 906,000 rentable square feet for an aggregate sales price of $110,463, excluding closing costs and including the repayment of one mortgage note with an outstanding principal balance of $13,095, an annual interest rate of 5.9% and a maturity date in August 2021.


Date of Sale	Number of Properties	Location	Rentable Square Feet	Gross Sales Price (1)		Gain (Loss) on Sale of Real Estate		Loss on Impairment of Real Estate
January 2020	2	Stafford, VA	65,000	$	14,063	$	4,771	$	—
January 2020	1	Windsor, CT	97,000	7,000		314		—
February 2020	1	Lincolnshire, IL	223,000	12,000		1,179		—
March 2020	1	Trenton, NJ	267,000	30,100		(179)		—
March 2020	1	Fairfax, VA	83,000	22,200		4,754		—
October 2020	4	Fairfax, VA	171,000	25,100		16		2,954









	10		906,000	$	110,463	$	10,855	$	2,954

We own interests in two joint ventures that own three properties. We account for these investments under the equity method of accounting. As of December 31, 2022 and 2021, our investments in unconsolidated joint ventures consisted of the following:


	OPI Ownership	OPI Carrying Value of Investments at December 31,				Number of Properties	Location	Rentable Square Feet
Joint Venture		2022		2021
Prosperity Metro Plaza	51%	$	19,237	$	20,672	2	Fairfax, VA	329,000
1750 H Street, NW	50%	15,892		14,166		1	Washington, D.C.	115,000
Total		$	35,129	$	34,838	3		444,000


Joint Venture	Interest Rate (1)	Maturity Date	Principal Balance at December 31, 2022 and 2021 (2)
Prosperity Metro Plaza	4.09%	12/1/2029	$	50,000
1750 H Street, NW	3.69%	8/1/2024	32,000
Weighted Average/Total	3.93%		$	82,000

(2)Reflects the entire balance of the debt secured by the properties and is not adjusted to reflect the interests in the joint ventures we do not own. None of the debt is recourse to us.

At December 31, 2022, the aggregate unamortized basis difference of our two unconsolidated joint ventures of $6,489 was primarily attributable to the difference between the amount we paid to purchase our interest in these joint ventures, including transaction costs, and the historical carrying value of the net assets of these joint ventures. This difference is being amortized over the remaining useful life of the related properties and the resulting amortization expense is included in equity in net losses of investees in our consolidated statements of comprehensive income (loss).