Document:

Sixth Supplemental Indenture

 Exhibit 4.1 
 EXECUTION VERSION 
 SIXTH SUPPLEMENTAL INDENTURE 
 DATED AS OF SEPTEMBER 28, 2009 
 ALLIANT ENERGY CORPORATION, 
 as Successor Company, 
 and 
 U.S. BANK NATIONAL ASSOCIATION, 
 Successor by Merger to 
 FIRSTAR
BANK, N.A., 
 as Trustee 
 Sixth Supplemental Indenture to the 
 Indenture 
 dated as of November 4, 1999 

 SIXTH SUPPLEMENTAL INDENTURE, dated as of September 28, 2009 (the “Sixth Supplemental
Indenture”), between ALLIANT ENERGY CORPORATION, a Wisconsin corporation (the “Company”), as successor to Alliant Energy Resources, LLC, formerly known as Alliant Energy Resources, Inc. (“Resources”), and U.S. BANK NATIONAL
ASSOCIATION, successor by merger to FIRSTAR BANK, N.A., as Trustee (the “Trustee”). 
 RECITALS OF THE COMPANY 
 The Company and Resources have heretofore executed and delivered to the Trustee an Indenture, dated as of November 4, 1999 (as supplemented and
amended from time to time, the “Indenture”), providing for the issuance from time to time of the Company’s unsecured unsubordinated debentures, notes or other evidences of indebtedness (the “Securities”), to be issued in one
or more series as provided in the Indenture. 
 Reference is made to that certain Fifth Supplemental Indenture dated as of November 25,
2008 (the “Fifth Supplemental Indenture”). On November 25, 2008, the Company and Resources executed and delivered to the Trustee the Fifth Supplemental Indenture pursuant to which the Company assumed the obligations of Resources under
the Indenture and the Notes and Resources were released from its obligations under the Indenture and the Notes. To date, the Trustee has not executed the Fifth Supplemental Indenture. In the view of the Company, the Trustee was required under the
Indenture to execute the Fifth Supplemental Indenture and all amendments set forth therein became effective as of November 25, 2008 without the Trustee’s signature. 
 Reference is made herein to an Offer to Purchase and Consent Solicitation Statement, dated September 16, 2009 (the “Offer to Purchase”),
relating to the Exchangeable Senior Notes due 2030 (the “Notes”) that are the only Securities outstanding as of the date hereof under the Indenture. 
 NOW, THEREFORE, THIS SIXTH SUPPLEMENTAL INDENTURE WITNESSETH: 
 For and in consideration of the premises
thereof, subject to Section 3.06 hereof, it is mutually covenanted and agreed as follows for the equal and ratable benefit of the Holders of the Securities: 
 ARTICLE 1. 
 WAIVER OF DEFAULT; RESCISSION OF ACCELERATION NOTICE; 
 ACKNOWLEDGEMENT OF ASSUMPTION; DISMISSAL OF LITIGATION 
 Section 1.01. Pursuant to Section 6.04 of the Indenture, any Default and the consequences thereof arising prior to the date hereof as a result of Resources’ failure to comply with the requirements of
Section 5.01 of the Indenture in connection with Resources conveying or transferring its properties and assets in one or more transactions (the “Alleged Default”), is hereby waived. 

 Section 1.02. Pursuant to Section 6.02 of the Indenture, the notice of acceleration, dated
April 22, 2009, from the Trustee to Resources and the Company, including the declaration that the entire principal amount of the Notes is due and payable immediately, and its consequences are hereby rescinded and annulled. 
 Section 1.03. Each of the parties to this Sixth Supplemental Indenture hereby stipulates that the Fifth Supplemental Indenture, and the following
amendments set forth therein, shall be deemed to have been effective as of 11:59 p.m. Central time on November 25, 2008: 
 (a) Alliant
Energy Corporation assumed all of the rights and obligations of Alliant Energy Resources, Inc. and its successors under the Indenture with respect to the Securities and under the Securities. 
 (b) Alliant Energy Resources, Inc. (and any successor thereto other than Alliant Energy Corporation) was released from its liabilities under the
Indenture and under the Securities as obligor on the Securities. 
 (c) Alliant Energy Corporation assumed the due and punctual payment of
the principal, any premium and interest on all the Securities of and with respect to any and all series issued under the Indenture and the performance of every covenant of the Indenture on the part of Alliant Energy Resources, Inc. and its
successors to be performed or observed. 
 (d) Alliant Energy Corporation succeeded to, and was substituted for and may exercise every right
and power of, Alliant Energy Resources, Inc. and its successors under the Indenture with the same effect as if Alliant Energy Corporation had been named as the Alliant Energy Resources, Inc. and its successors in the Indenture and Alliant Energy
Resources, Inc. (and any successor thereto other than Alliant Energy Corporation) was released from all obligations and covenants with respect to the Securities. 
 Section 1.04. On the Effective Date, the Trustee shall direct its counsel to sign and shall authorize Foley & Lardner LLP to file a stipulation of dismissal with prejudice (in the form previously agreed
by the parties hereto) of the proceeding in the United States District Court for the Western District of Wisconsin entitled U.S. Bank National Association v. Alliant Energy Resources, Inc. and Alliant Energy Corporation (Case No. 3:09-CV-00078)
(the “Litigation”) and agrees otherwise to use its reasonable best efforts to seek dismissal with prejudice of such proceeding as promptly as practicable after this Section 1.04 becomes operative pursuant to Section 3.06 hereof.

 Section 1.05. Upon the Effective Date, the Company shall pay to the Trustee (or directly to Trustee’s legal counsel as directed
by Trustee) the actual legal fees and expenses incurred by or on behalf of the Trustee and holders of beneficial interests in the Securities arising from the Alleged Default, the Litigation, the Fifth Supplemental Indenture and the Sixth
Supplemental Indenture that have been submitted in writing to the Company on or prior to the date of this Sixth Supplemental Indenture; provided that in no event shall such amount exceed $2,250,000 in the aggregate. Such payment shall be deemed to
have satisfied all obligations of the Company under the Indenture relating to the reimbursement of fees and expenses arising from the Alleged Default, the Litigation, the Fifth Supplemental Indenture or the Sixth Supplemental Indenture. Nothing
herein is intended to modify the Trustee’s lien rights under Section 7.07(d) of the Indenture. 
  

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 ARTICLE 2. 
 AMENDMENTS 
 Section 2.01. The following Sections and Article of the Indenture are hereby
deleted and the Company shall be released from its obligations under such Sections and Article: 
  

	 	•	 	 Section 4.03 – “Limitation on Liens”; 

  

	 	•	 	 Section 4.04 – “Limitation on Sale and Lease-Back Transactions”; 

  

	 	•	 	 Section 4.09 – “Maintenance of Properties”; 

  

	 	•	 	 Section 4.10 – “Insurance”; 

  

	 	•	 	 Section 4.11 – “Existence”; 

  

	 	•	 	 Section 4.12 – “Payment of Taxes and Other Claims”; and 

  

	 	•	 	 Article 5 – “Consolidation, Merger and Sale”. 

 Section 2.02 The occurrence of the events described in Sections 6.01(c) and Section 6.01(d) of the Indenture shall no longer constitute Events of Default under the Indenture and such Sections of the
Indenture are hereby deleted. 
 Section 2.03 All definitions set forth in Section 1.01 of the Indenture that relate to defined
terms used solely in the foregoing Sections or Article of the Indenture deleted hereby are hereby deleted from the Indenture. Section 1.01 of the Indenture is hereby amended by inserting the following new term with the following definition in
the appropriate alphabetic position: 
 “Sixth Supplemental Indenture” means the Sixth Supplemental Indenture dated as of
September 28, 2009 between the Company and the Trustee. 
 ARTICLE 3. 
 MISCELLANEOUS 
 Section 3.01. Capitalized terms used but not defined herein
shall have the respective meanings set forth in the Indenture. 
 Section 3.02. Except as supplemented and amended hereby, the Indenture
as supplemented and amended by the First Supplemental Indenture, the Second Supplemental Indenture, the Third Supplemental Indenture, the Fourth Supplemental Indenture and the Fifth Supplemental Indenture is in all respects ratified and confirmed,
and all of the terms, provisions and conditions thereof shall be and remain in full force and effect, and this Sixth Supplemental Indenture and all its provisions shall be deemed a part thereof. 
  

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 Section 3.03. In case any provision in this Sixth Supplemental Indenture 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 3.04. If any provision of this Sixth Supplemental Indenture limits, qualifies or conflicts with any other provision hereof or of the Indenture which provision is required to be included in the Indenture by any of the provisions
of the Trust Indenture Act, such required provision shall control. 
 Section 3.05. THIS SIXTH SUPPLEMENTAL INDENTURE SHALL BE GOVERNED
BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF WISCONSIN WITHOUT REGARD TO THE CONFLICTS OF LAWS AND RULES OF SAID STATE. 
 Section 3.06. This Sixth Supplemental Indenture shall become effective upon execution by the Company and the Trustee, but the provisions of Article 1 and Article 2 of this Sixth Supplemental Indenture shall not become operative until
the Company has accepted for purchase in the Tender Offer (as defined in the Offer to Purchase) all Notes validly tendered (and not validly withdrawn) prior to the Early Tender Date (as defined in the Offer to Purchase) (the “Effective
Date”). 
 Section 3.07. This Sixth Supplemental Indenture has been simultaneously executed in several counterparts, each of which
shall be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. Delivery by telecopier of an executed signature page hereto shall be effective as delivery of a manually executed counterpart
hereof. 
 Section 3.08. This Sixth Supplemental Indenture shall be deemed to have been executed on the date of the acknowledgment
thereof by the officer of the Trustee who signed it on behalf of the Trustee. 
  

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 IN WITNESS WHEREOF, the Company and the Trustee have caused their names to be signed hereto by their
respective officers thereunto duly authorized, to be hereunto affixed, all as of the day and year first above written. 
  

							
	ATTEST:	 	 ALLIANT ENERGY CORPORATION
 As Successor
Company

				
	 By:
	 	 /s/ F. J. Buri
	 	By:	 	 /s/ Patricia L. Kampling

	 Name:
	 	F. J. Buri	 	Name:	 	Patricia L. Kampling
	 Title:
	 	Corporate Secretary	 	Title:	 	Vice President – Chief Financial Officer and Treasurer
			
		 		 	 U.S. BANK NATIONAL ASSOCIATION,
 Successor
by Merger to
 FIRSTAR BANK, N.A., as Trustee

				
		 		 	By:	 	 /s/ James E. Murphy

		 		 	Name:	 	James E. Murphy
		 		 	Title:	 	Vice President

  

 5Specimen Common Stock Certificate of Ladder Capital Realty Finance Inc

 Exhibit 4.1 
 

 
  
 COMMON
STOCK COMMON STOCK 
 PAR VALUE $0.01 
 Ladder Capital Realty Finance Inc 
 INCORPORATED UNDER THE LAWS OF THE STATE OF MARYLAND 
 Certificate Number 
 Shares 
 THIS CERTIFIES THAT CEDE & CO. CUSIP 505744 102 
 SEE REVERSE FOR CERTAIN DEFINITIONS 
 is the owner of SEE REVERSE FOR IMPORTANT NOTICE ON TRANSFER RESTRICTIONS AND OTHER INFORMATION 
 FULLY-PAID AND NONASSESSABLE SHARES OF THE COMMON STOCK, $0.01 PAR VALUE PER SHARE, OF 
 Ladder Capital Realty Finance Inc (hereinafter called the “Company”), transferable on the books of the Company in person or by duly authorized attorney, upon surrender of this
Certificate properly endorsed. This Certificate and the shares represented hereby are issued and shall be held subject to all of the provisions of the charter and the bylaws of the Company and any amendments thereto (copies of which are on file with
the Company and with the Transfer Agent), to all of which the holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. 
 Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized officers. 
 Chief Executive Officer DATED
                    , 2009 
 COUNTERSIGNED AND REGISTERED: 
 AMERICAN STOCK TRANSFER & TRUST COMPANY, 
 TRANSFER AGENT AND REGISTRAR 
 Secretary 
 By 
 AUTHORIZED SIGNATURE 

 

 
  
 IMPORTANT NOTICE

 LADDER CAPITAL REALTY FINANCE INC 
 THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS A FULL STATEMENT OF THE INFORMATION REQUIRED BY SECTION 2-211(B) OF THE CORPORATIONS AND ASSOCIATIONS ARTICLE OF THE
ANNOTATED CODE OF MARYLAND WITH RESPECT TO THE DESIGNATIONS AND ANY PREFERENCES, CONVERSION AND OTHER RIGHTS, VOTING POWERS, RESTRICTIONS, LIMITATIONS AS TO DIVIDENDS AND OTHER DISTRIBUTIONS, QUALIFICATIONS, AND TERMS AND CONDITIONS OF REDEMPTION OF
THE STOCK OF EACH CLASS WHICH THE COMPANY HAS AUTHORITY TO ISSUE AND, (I) THE DIFFERENCES IN THE RELATIVE RIGHTS AND PREFERENCES BETWEEN THE SHARES OF EACH SERIES TO THE EXTENT SET AND (II) THE AUTHORITY OF THE BOARD OF DIRECTORS TO SET SUCH
RIGHTS AND PREFERENCES OF SUBSEQUENT SERIES. THE FOREGOING SUMMARY DOES NOT PURPORT TO BE COMPLETE AND IS SUBJECT TO AND QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE CHARTER OF THE COMPANY, A COPY OF WHICH WILL BE SENT WITHOUT CHARGE TO EACH
STOCKHOLDER WHO SO REQUESTS. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES TO GIVE
THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. 
 The following abbreviations, when used in the inscription on the face of this Certificate, shall be construed as though they were written
out in full according to applicable laws or regulations: 
 TEN COM—as tenants in common UNIF GIFT MIN ACT- Custodian

 (Cust)(Minor) 
 TEN ENT—as tenants by the entireties under Uniform Gifts to Minors Act 
 (State) 
 JT TEN -as joint tenants with right of survivorship and not as tenants in common UNIF TRF MIN ACT Custodian (until age ) 
 (Cust)(Minor) 
 under Uniform Transfers to Minors Act 
 (State) 
 Additional abbreviations may also be used though not in the above list. 
 The shares represented by this Certificate are subject to restrictions on Beneficial Ownership and Constructive Ownership and Transfer for
the purpose, among others, of the Company’s maintenance of its qualification as a real estate investment trust under the Internal Revenue Code of 1986, as amended (the “Code”). Subject to certain further restrictions and except as
expressly provided in the Company’s charter, (i) no Person may Beneficially Own or Constructively Own shares of Common Stock in excess of 9.8 percent (in value or number of shares, whichever is more restrictive) of the outstanding shares
of Common Stock unless such Person is an Excepted Holder (in which case the Excepted Holder Limit shall be applicable); (ii) no Person may Beneficially Own or Constructively Own shares of Capital Stock in excess of 9.8 percent (in value or
number of shares, whichever is more restrictive) of the total outstanding shares of Capital Stock, unless such Person is an Excepted Holder (in which case the Excepted Holder Limit shall be applicable); (iii) no Person may Beneficially Own or
Constructively Own Capital Stock that would result in the Company being “closely held” under Section 856(h) of the Code or otherwise cause the Company to fail to qualify as a REIT; and (iv) any Transfer of shares of Capital Stock
that, if effective would result in the Capital Stock being beneficially owned by less than 100 persons (as determined under the principles of Section 856(a)(5) of the Code) shall be void ab initio, and the intended transferee shall acquire no
rights in such shares of the Capital Stock. Any Person who Beneficially Owns or Constructively Owns or attempts to Beneficially Own or Constructively Own shares of Capital Stock which causes or will cause a Person to Beneficially Own or
Constructively Own shares of Capital Stock in excess or in violation of the above limitations must immediately notify the Company or, in the case of such a proposed or attempted transaction, give at least 15 days prior written notice. If any of the
restrictions on transfer or ownership as set forth in (i) through (iii) above are violated, the shares of Capital Stock in excess or in violation of the above limitations will be automatically transferred to a Trustee of a Trust for the
benefit of one or more Charitable Beneficiaries. In addition, the Company may redeem shares upon the terms and conditions specified by the Board of Directors in its sole discretion if the Board of Directors determines that ownership or a Transfer or
other event may violate the restrictions described above. Furthermore, upon the occurrence of certain events, attempted Transfers in violation of the restrictions described in (i) through (iii) above may be void ab initio. All capitalized
terms in this legend have the meanings defined in the charter of the Company, as the same may be amended from time to time, a copy of which, including the restrictions on transfer and ownership, will be furnished to each holder of Capital Stock on
request and without charge. Requests for such a copy may be directed to the Secretary of the Company at its principal office. 
 PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE 
 For value received, hereby sell,
assign and transfer unto 
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) 

Shares of the shares of stock represented by the within Certificate, and do hereby irrevocably constitute and appoint Attorney to
transfer the said shares on the books of the within-named Company with full power of substitution in the premises. 
 Dated:
20 
 Signature: 
 Signature: 
 Notice: The signature to this assignment must correspond with the name as written upon the face
of the Certificate, in every particular, without alteration or enlargement, or any change whatever. Signature(s) Guaranteed: Medallion Guarantee Stamp 
 THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (Banks, Stockbrokers, Savings and Loan Associations and Credit Unions) WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15.

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