Document:

exv4w1

 

Exhibit 4.1

EXECUTION COPY

     FIFTH SUPPLEMENTAL INDENTURE, dated as of February 9, 2007, by and among EOP Operating Limited
Partnership, a Delaware limited partnership (the “Issuer”), Equity Office Properties Trust, a
Maryland real estate investment trust (“EOPT”), Blackhawk Acquisition Trust, a Maryland real estate
investment trust (the “Initial Successor”), Blackhawk Parent LLC, a Delaware limited liability
company (the “Successor”), U.S. Bank National Association, as trustee (the “Trustee”), and, solely
with respect to the Internotes (as defined below), BNY Midwest Trust Company, as trustee (the
“Additional Trustee”).

W I T N E S S E T H:

     WHEREAS, the Issuer, EOPT and the Trustee have heretofore executed and delivered the Indenture
dated as of August 29, 2000 (as amended and supplemented to the date hereof, the “Indenture”), the
Issuer, EOPT and the Additional Trustee have heretofore executed and delivered the New Trustee
Appointment Agreement dated as of June 10, 2004, and the Issuer has issued pursuant to the
Indenture, among other securities, the following securities: 7.75% Notes due 2007 (the “7.75%
Notes”), Floating Rate Notes due 2010 (the “2010 Floating Rate Notes”), 4.65% Notes due 2010 (the
“4.65% Notes”), 7.00% Notes due 2011 (the “7.00% Notes”), 6.75% Notes due 2012 (the “6.75% Notes”),
5.875% Notes due 2013 (the “5.875% Notes”), 4.75% Notes due 2014 (the “4.75% Notes”), Floating Rate
Notes due 2014 (the “2014 Floating Rate Notes”), 7.875% Notes due 2031 (the “7.875% Notes”), the
4.00% Exchangeable Senior Notes due 2026 (the “Exchangeable Notes”) and the Internotes listed on
Schedule 1 hereto (the “Internotes” and together with the 7.75% Notes, the 2010 Floating Rate
Notes, the 4.65% Notes, the 7.00% Notes, the 6.75% Notes, the 5.875% Notes, the 4.75% Notes, the
2014 Floating Rate Notes, the 7.875% Notes and the Exchangeable Notes, collectively, the “Notes”);

     WHEREAS, EOPT, the Issuer, the Initial Successor, the Successor and Blackhawk Acquisition,
L.P., a Delaware limited partnership, have entered into an Agreement and Plan of Merger dated as of
November 19, 2006, as amended to the date hereof (the “Merger Agreement”), which contemplates,
among other things, the execution and filing on the date hereof of Articles of Merger (the
“Articles of Merger”) with the State Department of Assessments and Taxation of Maryland (the
“SDAT”) providing for the merger of EOPT with and into the Initial Successor (the “Merger”), with
the Initial Successor continuing its existence under Maryland law;

     WHEREAS, upon the acceptance for record of the Articles of Merger by the SDAT or at such other
time thereafter as is provided therein (the “Merger Effective Time”), the Merger will be effective
in accordance with the terms of the Articles of Merger and applicable law;

     WHEREAS, in connection with the liquidation of the Initial Successor contemplated by the
Merger Agreement, the Initial Successor and the Successor will execute and deliver an Assignment
and Assumption Agreement dated the date hereof (the “Assignment and Assumption Agreement”)
providing for the assignment to the Successor by the Initial Successor of substantially all of its assets and the assumption by the Successor of all of the
liabilities of the Initial Successor;

 

 

2

     WHEREAS, upon the effectiveness of the Assignment and Assumption Agreement (the “Transfer
Effective Time”), the transfer and assignment of substantially all of the assets of the Initial
Successor to the Successor and the assumption of all of the liabilities of the Initial Successor by
the Successor will be effective in accordance with the terms thereof and applicable law;

     WHEREAS, Section 801 of the Indenture provides, among other things, that EOPT may consolidate
with, or sell, lease or convey all or substantially all of its assets to, or merge with or into,
any other Person, provided that, among other things, the successor Person or its transferees or
assignees of such assets shall expressly assume the obligations of EOPT under its Guarantee and the
due and punctual performance and observance of all of the other covenants and conditions in the
Indenture;

     WHEREAS, Section 901 of the Indenture provides that the Issuer, the Guarantor and the Trustee
may, without the consent of any Holders, enter into a supplemental indenture for the purpose of
evidencing the succession of another Person to the Guarantor and the assumption by any such
successor of the covenants of the Guarantor contained in the Indenture and the Notes;

     WHEREAS, each of the Issuer, EOPT, the Initial Successor and the Successor has been duly
authorized by resolution to enter into this Fifth Supplemental Indenture; and

     WHEREAS, all other acts and proceedings required by law and by the Indenture to make this
Fifth Supplemental Indenture a valid and binding agreement for the purposes expressed herein, in
accordance with its terms, have been duly done and performed;

     NOW, THEREFORE, in consideration of the premises and the covenants and agreements contained
herein, and for other good and valuable consideration the receipt of which is hereby acknowledged,
the Issuer, EOPT, the Initial Successor, the Successor, the Trustee and, solely with respect to the
Internotes, the Additional Trustee, hereby agree as follows:

ARTICLE ONE

     SECTION 1.01. Definitions.

     Capitalized terms used in this Fifth Supplemental Indenture and not otherwise defined herein
shall have the meanings assigned to such terms in the Indenture.

ARTICLE TWO

     SECTION 2.01. Confirmation of Succession by the Initial Successor.

     (a) The Initial Successor hereby expressly assumes the obligations of EOPT under its Guarantee
(and as co-obligor of the Exchangeable Notes) and the due and punctual performance and observance
of all of the other covenants and conditions in the Indenture.

 

3

     (b) In accordance with Section 802 of the Indenture, the Initial Successor shall succeed to
and be substituted for EOPT with the same effect as if the Initial Successor had been named in the
Indenture as a party of the first part and EOPT is relieved of any further obligation under the
Indenture, the Notes and the Guarantee.

     (c) The reference in the preamble to the Indenture to “Equity Office Properties Trust, a
Maryland real estate investment trust, as guarantor (the “Guarantor”), having its principal offices
at Two North Riverside Plaza, Suite 2100, Chicago Illinois 60606” is hereby amended to read
“Blackhawk Acquisition Trust, a Maryland real estate investment trust, as guarantor (the
“Guarantor”), having its principal offices at Two North Riverside Plaza, Suite 2100, Chicago
Illinois 60606” and the provision for notices pursuant to Section 105 of the Indenture to the
Issuer and the Guarantor is hereby amended to include provision for all such notices to be copied
to Jonathan D. Gray, Blackstone Real Estate Partnerships V L.P., 345 Park Avenue, New York, New
York 10154, facsimile number (212) 583-5573).

     SECTION 2.02. Confirmation of Succession by the Successor.

     (a) The Successor hereby expressly assumes the obligations of the Initial Successor under its
Guarantee (and as co-obligor of the Exchangeable Notes) and the due and punctual performance and
observance of all of the other covenants and conditions in the Indenture.

     (b) In accordance with Section 802 of the Indenture, the Successor shall succeed to and be
substituted for the Initial Successor with the same effect as if the Successor had been named in
the Indenture as a party of the first part and the Initial Successor is relieved of any further
obligation under the Indenture, the Notes and the Guarantee.

     (c) The reference in the preamble to the Indenture following the Merger Effective Time to
“Blackhawk Acquisition Trust, a Maryland real estate investment trust, as guarantor (the
“Guarantor”), having its principal offices at Two North Riverside Plaza, Suite 2100, Chicago
Illinois 60606” is hereby amended to read “Blackhawk Parent LLC, a Delaware limited liability
company, as guarantor (the “Guarantor”), having its principal offices at Two North Riverside Plaza,
Suite 2100, Chicago Illinois 60606” and the provision for notices pursuant to Section 105 of the
Indenture to the Issuer and the Guarantor is hereby amended to include provision for all such
notices to be copied to Jonathan D. Gray, Blackstone Real Estate Partnerships V L.P., 345 Park
Avenue, New York, New York 10154, facsimile number (212) 583-5573).

ARTICLE THREE

     SECTION 3.01. Effectiveness of Fifth Supplemental Indenture; Operation of Amendments to
Indenture and the Notes.

     This Fifth Supplemental Indenture shall be effective upon its execution by the parties hereto,
provided that (i) Section 2.01 shall become operative concurrently with the

 

4

Merger Effective Time
and (ii) Section 2.02 shall become operative, following the Merger Effective Time, concurrently
with the Transfer Effective Time.

     SECTION 3.02. Severability.

     In case any provision in this Fifth Supplemental Indenture or the Notes shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the remaining provisions
shall not in any way be affected or impaired thereby.

     SECTION 3.03. Continuing Effect of Indenture.

     Except as expressly provided herein, all of the terms, provisions and conditions of the
Indenture and the Notes shall remain in full force and effect.

     SECTION 3.04. Construction of Fifth Supplemental Indenture.

     This Fifth Supplemental Indenture is executed as and shall constitute an indenture
supplemental to the Indenture and shall be construed in connection with and as part of the
Indenture. THIS FIFTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 3.05. Trust Indenture Act Controls.

     If any provision of this Fifth Supplemental Indenture limits, qualifies or conflicts with
another provision of this Fifth Supplemental Indenture or the Indenture that is required to be
included by the Trust Indenture Act of 1939, as amended, and as in force at the date as of which
this Fifth Supplemental Indenture is executed, the provision required by said Act shall control.

     SECTION 3.06. Disclaimer.

     (a) The recitals contained in this Fifth Supplemental Indenture shall be taken as the
statements of the Issuer, EOPT, the Initial Successor and the Successor. The Trustee and the
Additional Trustee assume no responsibility for their correctness. The Trustee and the Additional
Trustee make no representations as to the validity or sufficiency of this Fifth Supplemental
Indenture.

     (b) The Trustee, the Additional Trustee, the Issuer, EOPT, the Initial Successor and the
Successor acknowledge and agree that the Trustee is acting in its capacity as trustee with respect
to all Notes other than the Internotes, and that the Trustee shall not be responsible or liable for
any actions of the Additional Trustee.

     (c) The Trustee, the Additional Trustee, the Issuer, EOPT, the Initial Successor and the
Successor acknowledge and agree that the Additional Trustee is acting in its capacity as trustee
solely with respect to the Internotes, and that the Additional Trustee shall not be responsible or
liable for any actions of the Trustee.

 

5

     SECTION 3.07. Counterparts.

     This Fifth Supplemental Indenture may be executed in any number of counterparts, each of which
so executed shall be deemed to be an original, but all such counterparts shall together constitute
but one and the same instrument.

 

6

     IN WITNESS WHEREOF, the parties hereto have caused this Fifth Supplemental Indenture to be
duly executed, all as of the day and year first above written.

	 	 	 	 	 
	 	EOP OPERATING LIMITED PARTNERSHIP

 	 
	 	By:  	Equity Office Properties Trust, its General Partner
 	 
	 	 	 	 
	 	 	 	 
	 
	 	 	 
	 	By  	/s/
Stanley M. Stevens 	 
	 	 	Name:  	Stanley M. Stevens 	 
	 	 	Title:  	Executive Vice President, Chief Legal Counsel
and Secretary 	 
	 
	 
	 
	 	EQUITY OFFICE PROPERTIES TRUST

 	 
	 
	 	By  	/s/
Stanley M. Stevens 	 
	 	 	Name:  	Stanley M. Stevens 	 
	 	 	Title:  	Executive Vice President, Chief Legal Counsel
and Secretary 	 
	 
	 
	 
	 	BLACKHAWK ACQUISITION TRUST

 	 
	 
	 	By  	/s/
Kenneth A. Caplan 	 
	 	 	Name:  	Kenneth A. Caplan 	 
	 	 	Title:  	Vice President and Secretary 	 
	 
	 
	 
	 	BLACKHAWK PARENT LLC

 	 
	 
	 	By  	/s/
Kenneth A. Caplan 	 
	 	 	Name:  	Kenneth A. Caplan 	 
	 	 	Title:  	Vice President, Secretary and Managing Director 	 

 

7

	 	 	 	 	 

	 	 	 	 	 
	 	U.S. BANK NATIONAL ASSOCIATION, as Trustee

 	 
	 
	 	By  	/s/
Richard
Prokosch 	 
	 	 	Name:  	Richard Prokosch 	 
	 	 	Title:  	Vice President 	 
	 
	 
	 
	 	BNY MIDWEST TRUST COMPANY, as 

Additional Trustee solely with 

respect to the Internotes

 	 
	 
	 	By  	/s/
Steven D. Torgeson 	 
	 	 	Name:  	Steven D. Torgeson 	 
	 	 	Title:  	Vice President 	 

 

8

SCHEDULE 1

Internotes

	 	 	 	 	 
	CUSIP No.	 	Security Description	 	Maturity Date

	 
	 	 	 	 
	26876EAA3

	 	4.750% Internotes due 2008
	 	June 15, 2008
	 
	 	 	 	 
	26876EAB1

	 	5.250% Internotes due 2010
	 	June 15, 2010
	 
	 	 	 	 
	26876EAC9

	 	4.550% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876EAD7

	 	5.100% Internotes due 2010
	 	July 15, 2010
	 
	 	 	 	 
	26876EAE5

	 	4.600% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876EAF2

	 	5.150% Internotes due 2010
	 	July 15, 2010
	 
	 	 	 	 
	26876EAG0

	 	4.300% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876EAH8

	 	4.850% Internotes due 2010
	 	July 15, 2010
	 
	 	 	 	 
	26876EAJ4

	 	4.300% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876EAK1

	 	5.000% Internotes due 2011
	 	January 15, 2011
	 
	 	 	 	 
	26876EAL9

	 	3.700% Internotes due 2007
	 	July 15, 2007
	 
	 	 	 	 
	26876EAM7

	 	4.150% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876EAN5

	 	4.000% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EAP0

	 	3.900% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EAQ8

	 	3.800% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EAS4

	 	3.900% Internotes due 2008
	 	November 15, 2008
	 
	 	 	 	 
	26876EAU9

	 	3.950% Internotes due 2008
	 	December 15, 2008
	 
	 	 	 	 
	26876EAW5

	 	4.100% Internotes due 2008
	 	December 15, 2008
	 
	 	 	 	 
	26876EAY1

	 	3.950% Internotes due 2008
	 	December 15, 2008
	 
	 	 	 	 
	26876EBA2

	 	4.000% Internotes due 2009
	 	June 15, 2009
	 
	 	 	 	 
	26876EBC8

	 	4.000% Internotes due 2008
	 	December 15, 2008
	 
	 	 	 	 
	26876EBE4

	 	4.000% Internotes due 2009
	 	January 15, 2009
	 
	 	 	 	 
	26876EBG9

	 	4.000% Internotes due 2009
	 	January 15, 2009
	 
	 	 	 	 
	26876EBJ3

	 	4.150% Internotes due 2009
	 	January 15, 2009
	 
	 	 	 	 
	26876EBL8

	 	4.150% Internotes due 2009
	 	January 15, 2009
	 
	 	 	 	 
	26876EBM6

	 	3.700% Internotes due 2007
	 	February 15, 2007
	 
	 	 	 	 
	26876EBN4

	 	4.100% Internotes due 2009
	 	February 15, 2009
	 
	 	 	 	 
	26876EBP9

	 	3.750% Internotes due 2007
	 	February 15, 2007
	 
	 	 	 	 
	26876EBQ7

	 	4.150% Internotes due 2009
	 	February 15, 2009
	 
	 	 	 	 
	26876EBR5

	 	4.050% Internotes due 2008
	 	March 15, 2008
	 
	 	 	 	 
	26876EBS3

	 	4.250% Internotes due 2009
	 	March 15, 2009
	 
	 	 	 	 
	26876EBT1

	 	4.400% Internotes due 2008
	 	March 15, 2008
	 
	 	 	 	 
	26876EBU8

	 	4.750% Internotes due 2010
	 	March 15, 2010
	 
	 	 	 	 
	26876EBV6

	 	4.400% Internotes due 2007
	 	April 15, 2007
	 
	 	 	 	 
	26876EBW4

	 	4.800% Internotes due 2009
	 	April 15, 2009
	 
	 	 	 	 
	26876EBX2

	 	4.300% Internotes due 2007
	 	April 15, 2007

 

9

	 	 	 	 	 
	CUSIP No.	 	Security Description	 	Maturity Date

	 
	 	 	 	 
	26876EBY0

	 	4.450% Internotes due 2008
	 	April 15, 2008
	 
	 	 	 	 
	26876EBZ7

	 	4.300% Internotes due 2007
	 	April 15, 2007
	 
	 	 	 	 
	26876ECA1

	 	4.500% Internotes due 2008
	 	April 15, 2008
	 
	 	 	 	 
	26876ECB9

	 	4.350% Internotes due 2008
	 	June 15, 2008
	 
	 	 	 	 
	26876ECC7

	 	4.625% Internotes due 2010
	 	June 15, 2010
	 
	 	 	 	 
	26876ECD5

	 	4.100% Internotes due 2007
	 	June 15, 2007
	 
	 	 	 	 
	26876ECE3

	 	4.250% Internotes due 2008
	 	June 15, 2008
	 
	 	 	 	 
	26876ECF0

	 	4.200% Internotes due 2008
	 	June 15, 2008
	 
	 	 	 	 
	26876ECG8

	 	4.500% Internotes due 2011
	 	June 15, 2011
	 
	 	 	 	 
	26876ECH6

	 	4.200% Internotes due 2007
	 	June 15, 2007
	 
	 	 	 	 
	26876ECJ2

	 	4.350% Internotes due 2008
	 	June 15, 2008
	 
	 	 	 	 
	26876ECK9

	 	4.400% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876ECL7

	 	4.500% Internotes due 2009
	 	July 15, 2009
	 
	 	 	 	 
	26876ECM5

	 	4.400% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876ECN3

	 	4.500% Internotes due 2009
	 	July 15, 2009
	 
	 	 	 	 
	26876ECP8

	 	4.450% Internotes due 2008
	 	July 15, 2008
	 
	 	 	 	 
	26876ECQ6

	 	4.550% Internotes due 2009
	 	July 15, 2009
	 
	 	 	 	 
	26876ECR4

	 	4.550% Internotes due 2008
	 	September 15, 2008
	 
	 	 	 	 
	26876ECS2

	 	4.650% Internotes due 2009
	 	September 15, 2009
	 
	 	 	 	 
	26876ECT0

	 	4.550% Internotes due 2008
	 	September 15, 2008
	 
	 	 	 	 
	26876ECU7

	 	4.650% Internotes due 2009
	 	September 15, 2009
	 
	 	 	 	 
	26876ECV5

	 	4.400% Internotes due 2008
	 	September 15, 2008
	 
	 	 	 	 
	26876ECW3

	 	4.450% Internotes due 2009
	 	September 15, 2009
	 
	 	 	 	 
	26876ECX1

	 	4.400% Internotes due 2008
	 	September 15, 2008
	 
	 	 	 	 
	26876ECY9

	 	4.500% Internotes due 2009
	 	September 15, 2009
	 
	 	 	 	 
	26876ECZ6

	 	4.650% Internotes due 2011
	 	September 15, 2011
	 
	 	 	 	 
	26876EDA0

	 	4.450% Internotes due 2008
	 	September 15, 2008
	 
	 	 	 	 
	26876EDB8

	 	4.550% Internotes due 2009
	 	September 15, 2009
	 
	 	 	 	 
	26876EDC6

	 	4.700% Internotes due 2011
	 	September 15, 2011
	 
	 	 	 	 
	26876EDD4

	 	4.550% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EDE2

	 	4.650% Internotes due 2009
	 	October 15, 2009
	 
	 	 	 	 
	26876EDF9

	 	4.700% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EDG7

	 	4.800% Internotes due 2009
	 	October 15, 2009
	 
	 	 	 	 
	26876EDH5

	 	4.750% Internotes due 2008
	 	October 15, 2008
	 
	 	 	 	 
	26876EDJ1

	 	5.000% Internotes due 2011
	 	October 15, 2011exv4w2

 

Exhibit 4.2

EXECUTION COPY

     NINETEENTH SUPPLEMENTAL INDENTURE, dated as of February 9, 2007, to the Indenture dated as of
December 6, 1995 (as amended and supplemented to the date hereof, the “Indenture”), by and among
EOP Operating Limited Partnership, a Delaware limited partnership (the “Issuer”), Equity Office
Properties Trust, a Maryland real estate investment trust (“EOPT”), Blackhawk Acquisition Trust, a
Maryland real estate investment trust (the “Initial Successor”), Blackhawk Parent LLC, a Delaware
limited liability company (the “Successor”), and U.S. Bank National Association, as trustee (the
“Trustee”).

W I T N E S S E T H:

     WHEREAS, the Issuer, EOPT and the Trustee have heretofore executed and delivered the
Indenture, and the Issuer has issued pursuant to the Indenture, among other securities, the
following outstanding securities: 6.75% Notes due 2008 (the “6.75% Notes”), 7.125% Notes due 2009
(the “7.125% Notes”), 7.25% Notes due 2009 (the “7.25% Notes”), 7.65% Notes due 2010 (the “7.65%
Notes”), 7.35% Debentures due 2017 (the “7.35% Debentures”) and 7.50% Debentures due 2027 (together
with the 6.75% Notes, the 7.125% Notes, the 7.25% Notes, the 7.65% Notes and the 7.35% Debentures,
each “a series of Notes” and collectively the “Notes”);

     WHEREAS, EOPT, the Issuer, the Initial Successor, the Successor and Blackhawk Acquisition,
L.P., a Delaware limited partnership, have entered into an Agreement and Plan of Merger dated as of
November 19, 2006, as amended to the date hereof (the “Merger Agreement”), which contemplates,
among other things, the execution and filing on the date hereof of Articles of Merger (the
“Articles of Merger”) with the State Department of Assessments and Taxation of Maryland (the
“SDAT”) providing for the merger of EOPT with and into the Initial Successor (the “Merger”), with
the Initial Successor continuing its existence under Maryland law;

     WHEREAS, upon the acceptance for record of the Articles of Merger by the SDAT or at such other
time thereafter as is provided therein (the “Merger Effective Time”), the Merger will be effective
in accordance with the terms of the Articles of Merger and applicable law;

     WHEREAS, in connection with the liquidation of the Initial Successor contemplated by the
Merger Agreement, the Initial Successor and the Successor will execute and deliver an Assignment
and Assumption Agreement dated the date hereof (the “Assignment and Assumption Agreement”)
providing for the assignment to the Successor by the Initial Successor of substantially all of its
assets and the assumption by the Successor of all of the liabilities of the Initial Successor;

     WHEREAS, upon the effectiveness of the Assignment and Assumption Agreement (the “Transfer
Effective Time”), the transfer and assignment of substantially all of the assets of the Initial
Successor to the Successor and the assumption of all of the liabilities of the Initial Successor by the Successor will be effective in accordance with the terms thereof
and applicable law;

 

 

2

     WHEREAS, Section 801 of the Indenture provides, among other things, that EOPT may consolidate
with, or sell, lease or convey all or substantially all of its assets to, or merge with or into,
any other Person, provided that, among other things, the successor Person or its transferees or
assignees of such assets shall expressly assume the obligations of EOPT under its Guarantee and the
due and punctual performance and observance of all of the other covenants and conditions in the
Indenture;

     WHEREAS, Section 901 of the Indenture provides that the Issuer, the Guarantor and the Trustee
may, without the consent of any Holders, enter into a supplemental indenture for the purpose of
evidencing the succession of another Person to the Guarantor and the assumption by any such
successor of the covenants of the Guarantor contained in the Indenture and the Notes;

     WHEREAS, each of the Issuer, EOPT, the Initial Successor and the Successor has been duly
authorized by resolution to enter into this Nineteenth Supplemental Indenture; and

     WHEREAS, all other acts and proceedings required by law and by the Indenture to make this
Nineteenth Supplemental Indenture a valid and binding agreement for the purposes expressed herein,
in accordance with its terms, have been duly done and performed;

     NOW, THEREFORE, in consideration of the premises and the covenants and agreements contained
herein, and for other good and valuable consideration the receipt of which is hereby acknowledged,
the Issuer, EOPT, the Initial Successor, the Successor, the Trustee and, solely with respect to the
Internotes, the Additional Trustee, hereby agree as follows:

ARTICLE ONE

     SECTION 1.01. Definitions.

     Capitalized terms used in this Nineteenth Supplemental Indenture and not otherwise defined
herein shall have the meanings assigned to such terms in the Indenture.

ARTICLE TWO

     SECTION 2.01. Confirmation of Succession by the Initial Successor.

     (a) The Initial Successor hereby expressly assumes the obligations of EOPT under its Guarantee
and the due and punctual performance and observance of all of the other covenants and conditions in
the Indenture.

     (b) In accordance with Section 802 of the Indenture, the Initial Successor shall succeed to
and be substituted for EOPT with the same effect as if the Initial Successor had been named in the
Indenture as a party of the first part and EOPT is relieved of any further obligation under the
Indenture, the Notes and the Guarantee.

 

3

     (c) The reference in the preamble to the Indenture to “Equity Office Properties Trust, a
Maryland real estate investment trust, as guarantor (the “Guarantor”), having its principal offices
at Two North Riverside Plaza, Suite 2100, Chicago Illinois 60606” is hereby amended to read
“Blackhawk Acquisition Trust, a Maryland real estate investment trust, as guarantor (the
“Guarantor”), having its principal offices at Two North Riverside Plaza, Suite 2100, Chicago
Illinois 60606” and the provision for notices pursuant to Section 105 of the Indenture to the
Issuer and the Guarantor is hereby amended to include provision for all such notices to be copied
to Jonathan D. Gray, Blackstone Real Estate Partnerships V L.P., 345 Park Avenue, New York, New
York 10154, facsimile number (212) 583-5573).

     SECTION 2.02. Confirmation of Succession by the Successor.

     (a) The Successor hereby expressly assumes the obligations of the Initial Successor under its
Guarantee and the due and punctual performance and observance of all of the other covenants and
conditions in the Indenture.

     (b) In accordance with Section 802 of the Indenture, the Successor shall succeed to and be
substituted for the Initial Successor with the same effect as if the Successor had been named in
the Indenture as a party of the first part and the Initial Successor is relieved of any further
obligation under the Indenture, the Notes and the Guarantee.

     (c) The reference in the preamble to the Indenture following the Merger Effective Time to
“Blackhawk Acquisition Trust, a Maryland real estate investment trust, as guarantor (the
“Guarantor”), having its principal offices at Two North Riverside Plaza, Suite 2100, Chicago
Illinois 60606” is hereby amended to read “Blackhawk Parent LLC, a Delaware limited liability
company, as guarantor (the “Guarantor”), having its principal offices at Two North Riverside Plaza,
Suite 2100, Chicago Illinois 60606” and the provision for notices pursuant to Section 105 of the
Indenture to the Issuer and the Guarantor is hereby amended to include provision for all such
notices to be copied to Jonathan D. Gray, Blackstone Real Estate Partnerships V L.P., 345 Park
Avenue, New York, New York 10154, facsimile number (212) 583-5573).

ARTICLE THREE

	 	 	SECTION 3.01. Effectiveness of Nineteenth Supplemental Indenture; Operation of Amendments to
Indenture and the Notes.

     This Nineteenth Supplemental Indenture shall be effective upon its execution by the parties
hereto, provided that (i) Section 2.01 shall become operative concurrently with the Merger
Effective Time and (ii) Section 2.02 shall become operative, following the Merger Effective Time,
concurrently with the Transfer Effective Time.

 

4

     SECTION 3.02. Severability.

     In case any provision in this Nineteenth Supplemental Indenture or the Notes shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the remaining provisions
shall not in any way be affected or impaired thereby.

     SECTION 3.03. Continuing Effect of Indenture.

     Except as expressly provided herein, all of the terms, provisions and conditions of the
Indenture and the Notes shall remain in full force and effect.

     SECTION 3.04. Construction of Nineteenth Supplemental Indenture.

     This Nineteenth Supplemental Indenture is executed as and shall constitute an indenture
supplemental to the Indenture and shall be construed in connection with and as part of the
Indenture. THIS NINETEENTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     SECTION 3.05. Trust Indenture Act Controls.

     If any provision of this Nineteenth Supplemental Indenture limits, qualifies or conflicts with
another provision of this Nineteenth Supplemental Indenture or the Indenture that is required to be
included by the Trust Indenture Act of 1939, as amended, and as in force at the date as of which
this Nineteenth Supplemental Indenture is executed, the provision required by said Act shall
control.

     SECTION 3.06. Disclaimer.

     The recitals contained in this Nineteenth Supplemental Indenture shall be taken as the
statements of the Issuer, EOPT, the Initial Successor and the Successor. The Trustee assumes no
responsibility for their correctness. The Trustee makes no representations as to the validity or
sufficiency of this Nineteenth Supplemental Indenture.

     SECTION 3.07. Counterparts.

     This Nineteenth Supplemental Indenture may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts shall together
constitute but one and the same instrument.

 

5

     IN WITNESS WHEREOF, the parties hereto have caused this Nineteenth Supplemental Indenture to
be duly executed, all as of the day and year first above written.

	 	 	 	 	 
	 
	 	EOP OPERATING LIMITED PARTNERSHIP

 	 
	 	By:  	Equity Office Properties Trust, its General Partner
 	 
	 	 	 	 
	 	 	 	 
	 	 	 
	 	By  	/s/
Stanley M. Stevens 	 
	 	 	Name:  	Stanley M. Stevens 	 
	 	 	Title:  	Executive Vice President, Chief Legal Counsel
and Secretary 	 
	 
	 
	 
	 	EQUITY OFFICE PROPERTIES TRUST

 	 
	 
	 	By  	/s/
Stanley M. Stevens 	 
	 	 	Name:  	Stanley M. Stevens 	 
	 	 	Title:  	Executive Vice President, Chief Legal Counsel
and Secretary 	 
	 
	 
	 
	 	BLACKHAWK ACQUISITION TRUST

 	 
	 
	 	By  	/s/
Kenneth A. Caplan 	 
	 	 	Name:  	Kenneth A. Caplan 	 
	 	 	Title:  	Vice President and Secretary 	 
	 
	 
	 
	 	BLACKHAWK PARENT LLC

 	 
	 
	 	By  	/s/
Kenneth A. Caplan 	 
	 	 	Name:  	Kenneth A. Caplan 	 
	 	 	Title:  	Vice President, Secretary and

Managing Director 	 

 

6

	 	 	 	 	 
	 	U.S. BANK NATIONAL ASSOCIATION,

as Trustee

 	 
	 
	 	By  	/s/ Richard Prokosch	 
	 	 	Name:  	Richard Prokosch 	 
	 	 	Title:  	Vice President

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