Document:

EX-10.19

 Exhibit 10.19 

FIRST AMENDMENT TO LEASE 

THIS FIRST AMENDMENT TO LEASE (“First
Amendment”) is made effective and entered into as of December 12, 2013, by and between 2000 SIERRA POINT PARKWAY LLC, a Delaware limited liability company (“Landlord”), and
HYPERION THERAPEUTICS, INC., a Delaware corporation (“Tenant”). 
 RECITALS

 A. Landlord and Tenant are parties to that certain Lease Agreement (“Lease”) dated October 14, 2013
pursuant to which Landlord leases to Tenant and Tenant leases from Landlord the Fourth Floor commonly known as Suite 400, which contains approximately 20,116 rentable square feet (“Premises”) at 2000 Sierra Point Parkway,
Brisbane, California (“Building”). 
 B. Tenant desires to lease a storage room located on the First Floor of the
Building. 
 NOW, THEREFORE, in consideration of the foregoing Recitals, and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, Landlord and Tenant hereby agree as follows: 
 1. Storage Room. Throughout the
Term (as extended or earlier terminated per the Lease), Landlord shall lease to Tenant and Tenant shall lease from Landlord the Storage Room located on the First Floor of the Building, which contains approximately 352 rentable square feet, shall be
exclusively used for storage, and is shown in the floor plan attached hereto as Exhibit A (“Storage Room”). From time-to-time, but with at least thirty (30) days advance notice, Landlord shall have the right to
relocate the Storage Room to another area located on the First Floor of the Building of equal or greater size and comparably suited for Tenant’s Storage, and with equal rights of access. The square footage of the Storage Room shall not be taken
into account in calculating Tenant’s Pro Rata Share, Operating Expense Reimbursement, or any pro rata right, or obligation of tenant for the property (such as parking spaces). 

2. Base Monthly Rent. Commencing upon the Rent Commencement Date (which includes fully abated rent for Months 1-6), the monthly base
rent for the Storage Room shall be $1,000, and shall increase on Month 13 and annually thereafter by three percent (3%). No Operating Expense Reimbursement shall be due on the Storage Room. 

3. No Further Amendment. The Lease, as modified by this First Amendment, shall remain in full force and effect. 

4. Confirmation of Lease. Tenant hereby represents and warrants to Landlord that, as of the date hereof, (a) the Lease is in full force
and effect and has not been modified except pursuant to this First Amendment; (b) Tenant has not subleased or assigned any of its right, title and interest in and to the Lease and has full power and authority to enter into and perform its
obligations hereunder; (c) to Tenant’s knowledge, there are no defaults on the part of Landlord existing under the Lease; (d) to Tenant’s knowledge, there exists no valid abatements, causes of action, counterclaims, disputes, defenses,
offsets, credits, deductions, 

 
or claims against the enforcement of any of the terms and conditions of the Lease, except as specifically set forth in the Lease; (e) this First Amendment has been duly authorized, executed
and delivered by Tenant and constitutes the legal, valid and binding obligation of Tenant; and (f) there are no actions, whether voluntary or otherwise, pending against Tenant under the bankruptcy or insolvency laws of the United States or any
state thereof. 
 5. Voluntary Agreement. The parties have read this First Amendment, and on the advice of counsel they have freely
and voluntarily entered into this First Amendment. 
 6. Representation by Counsel. Each party acknowledges that it has been
represented by independent legal counsel of its own choice in connection with the execution of this First Amendment and has had an adequate opportunity to investigate the subject matter of this First Amendment before executing this First Amendment.

 7. Brokerage. Landlord and Tenant each warrant to the other that it has not had dealings with any other finder, broker, or agent
in connection with this First Amendment. Each party shall indemnify, defend and hold harmless the other party from and against any and all costs, expenses or liability for commissions or other compensation or charges claimed by any other finder,
broker, or agent based on dealings with the indemnifying party with respect to this First Amendment. 
 8. General Provisions. This
First Amendment shall bind and inure to the benefit of the parties and their respective successors and assigns. This First Amendment shall be governed, and construed in accordance with, the laws of the State of California without regard to or
application of the principles of conflict of laws. This First Amendment together with the Lease constitutes the entire agreement between the parties with respect to the subject matter hereof and thereof. 

9. Counterparts. This First Amendment may be signed in two or more counterparts. When at least one such counterpart has been signed by
each party, this First Amendment shall be deemed to have been fully executed, each counterpart shall be deemed to be an original, and all counterparts shall be deemed to be one and the same agreement. 

IN WITNESS WHEREOF, the parties have executed this First Amendment to Lease as of the date
first set forth above. 
  

											
		 	TENANT:	 	LANDLORD:
			
		 	 HYPERION THERAPEUTICS, INC. 
	 	 2000 SIERRA POINT PARKWAY LLC

	 a Delaware corporation
	 	a Delaware limited liability company
						
		 	By:	 	 /s/ Jeffrey S. Farrow
	 		 	By:	 	 /s/ Stephen P. Diamond

						
		 	Name:	 	Jeffrey S. Farrow	 		 	Name:	 	STEPHEN P. DIAMOND
						
		 	Title:	 	CFO	 		 	Title:	 	MANAGER
						
		 	Date:	 	12/12/2013	 		 	Date:	 	12/12/2013

 EXHIBIT A: First Floor Plan 

STORAGE ROOMEX-4.4

 Exhibit 4.4 

THIRD SUPPLEMENTAL INDENTURE 

Third Supplemental Indenture (this “Supplemental Indenture”), dated as of February 21, 2014, among Alcomat, LLC, a
Delaware limited liability company, Alleyton Resource Company, LLC, a Delaware limited liability company and Alleyton Services Company, LLC, a Delaware limited liability company (each, a “Guaranteeing Subsidiary” and collectively,
the “Guaranteeing Subsidiaries”), each a subsidiary of Summit Materials, LLC, a Delaware limited liability company (the “Company”), and Wilmington Trust, National Association, a national banking association, as
trustee (the “Trustee”). 
 W I T N E S S E T H 

WHEREAS, the Company, Summit Materials Finance Corp., a Delaware corporation (the “Co-Issuer”, and together with the Company,
the “Issuers”), and certain Guarantors have heretofore executed and delivered to the Trustee an Indenture (the “Indenture”), dated as of January 30, 2012, providing for the issuance of an unlimited aggregate
principal amount of 10.5% Senior Notes due 2020 (the “Notes”), as supplemented by that First Supplemental Indenture, dated as of March 13, 2012, and further supplemented by that Second Supplemental Indenture, dated as of
January 17, 2014; 
 WHEREAS, the Indenture provides that under certain circumstances each Guaranteeing Subsidiary shall execute and
deliver to the Trustee a supplemental indenture pursuant to which such Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuers’ Obligations under the Notes and the Indenture on the terms and conditions set forth herein and
under the Indenture (the “Guarantee”); and 
 WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture, without the consent of the holders of the Notes. 
 NOW THEREFORE, in
consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows: 

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 

(2) Agreement to Guarantee. Each Guaranteeing Subsidiary acknowledges that it has received and reviewed a copy of the Indenture and all
other documents it deems necessary to review in order to enter into this Supplemental Indenture, and acknowledges and agrees to (i) join and become a party to the Indenture as indicated by its signature below; (ii) be bound by the
Indenture, as of the date hereof, as if made by, and with respect to, each signatory hereto; and (iii) perform all obligations and duties required of a Guarantor pursuant to the Indenture. Each Guaranteeing Subsidiary hereby agrees to provide
an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture, including, but not limited to, Article 10 thereof. 

(3) Execution and Delivery. Each Guaranteeing Subsidiary agrees that the Guarantee shall remain in full force and effect
notwithstanding the absence of the endorsement of any notation of such Guarantee on the Notes. 
 (4) No Recourse Against Others. No
past, present or future director, officer, employee, incorporator, member, partner or stockholder of the Issuers or any Guaranteeing Subsidiary (other than the Issuers and the Guarantors) shall have any liability for any obligations of the Issuers
or the Guarantors (including any Guaranteeing Subsidiary) under the Notes, any Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by
accepting Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. 

(5) Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

  
 1 

 (6) Counterparts. The parties may sign any number of copies of this Supplemental
Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. This Supplemental Indenture may be executed in multiple counterparts which, when taken together, shall constitute one instrument. The exchange
of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmissions shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original
Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes. 

(7) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof. 

(8) The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this
Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guaranteeing Subsidiaries. 

(9) Benefits Acknowledged. Each Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth in the
Indenture. Each Guaranteeing Subsidiary acknowledges that they will receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and this Supplemental Indenture and that the guarantee and waivers made by them
pursuant to this Guarantee are knowingly made in contemplation of such benefits. 
 (10) Successors. All agreements of each
Guaranteeing Subsidiary in this Supplemental Indenture shall bind their respective Successors, except as otherwise provided in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors. 

[Signatures on following page] 

  
 2 

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

			
	 ALCOMAT, LLC

		
	 By:
	 	 /s/ Anne L. Benedict

		 	Name: Anne L. Benedict
		 	Title: Secretary
	
	 ALLEYTON RESOURCE COMPANY, LLC

		
	 By:
	 	 /s/ Anne L. Benedict

		 	Name: Anne L. Benedict
		 	Title: Secretary
	
	 ALLEYTON SERVICES COMPANY, LLC

		
	 By:
	 	 /s/ Anne L. Benedict

		 	Name: Anne L. Benedict
		 	Title: Secretary

  

  
 [Signature Page to Third
Supplemental Indenture] 

 
			
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Trustee

		
	 By:
	 	 /s/ Joseph O’Donnell

		 	Name: Joseph O’Donnell
		 	Title: Vice President

  

  
 [Signature Page to Third
Supplemental Indenture]

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