Document:

First Amendment to Office Building Lease

 EXHIBIT 10.27 
 FIRST AMENDMENT OF LEASE 
 THIS FIRST AMENDMENT OF LEASE (this “FIRST Amendment”) dated this 28th day of September,
2001, is by and between 475 - 17TH STREET, CO., a Limited Partnership (“Landlord”) and Collis P. Chandler III, (“Tenant”). 
 RECITALS: 
  

	A.	Landlord and Tenant entered into a certain Office Building Lease, dated January 31, 2000 (the “Base Lease”). The Base Lease and this First Amendment of Lease shall
hereinafter be referred as “Lease” pertaining to certain premises located in the building commonly known as The 475 17th Street Building, Suite 860, 475 17th Street, Denver, Colorado 80202 (the “Original Premises”), as more
particularly described in the Lease. 

  

	B.	Terms defined in the Base Lease and delineated herein by initial capital letters shall have the same meaning ascribed thereto in the Lease except to the extent that the meaning of
such term is specifically modified by the provisions hereof. 

 NOW, THEREFORE, in consideration of the mutual covenants as hereinafter set
forth, and other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, the parties hereto agree as follows: 
  

	1.	Recitals: The foregoing recitals are true and correct and incorporated herein by this reference. 

  

	2.	Relocation and Expansion: Landlord agrees to allow Tenant to relocate with an expansion to Suite 544 consisting of approximately 1,414 rentable square feet (r.s.f.)
(“Premises”). 

  

	3.	Term: The Primary Lease Term shall commence October 1, 2001, (“Commencement Date”) and terminate January 31, 2003 (the “Termination Date”).

  

	4.	Base Rate: Commencing October 1, 2001 and terminating January 31, 2003, the Base Rent shall be equal to the sum of Thirty-six Thousand Two Hundred Ninety-two and
68/100 Dollars ($36,292.68) which sum shall be payable to Landlord as follows: 

 10/01/01 - 01/31/02 @ $18.50/rsf = $2,179.92/mo

 02/01/02 - 01/31/03 @ $19.50/rsf = $2,297.75/mo 
  

	6.	Pro Rata Share: Tenant’s Pro Rata Share will remain 0.9338%. 

  

	7.	Except as specifically amended by the provisions provided hereof, the terms and provisions in the Lease shall continue to govern the rights and obligations of the parties
thereunder, and all provisions and covenants of the Lease shall remain in full force and effect as stated therein. This First Amendment of Lease, and the Base Lease, shall be construed as one instrument. 

  

	8.	The terms, provisions and covenants of this First Amendment of Lease shall inure to the benefit of and be binding upon the parties hereto and their respective successors and
assigns. 

	 	9.	The Lease as amended by the First Amendment, contains all of the agreements of the parties hereto with respect to any matter covered or mentioned in the Base Lease, as amended by
the First Amendment of lease, and no prior agreement, understanding or representation pertaining to any such matter shall be effective for any purpose. No provision of the Lease may be amended or added to except by an agreement in writing signed by
the parties hereto or their respective successors in interest. 

 IN WITNESS WHEREOF the parties hereto have executed this indenture by
affixing their corporate seals by their authorized officers in that behalf, or by Tenant’s signature hereto, as of the date first above written. 
  

											
	 LANDLORD: 475 - 17th Street, Co.,
 a Colorado
limited partnership
	 		 	TENANT: Collis P. Chandler III
					
	By:	 	/s/ John Fletcher III	 		 	By:	 	/s/ Collis P. Chandler III
		 	John Fletcher III	 		 		 	Print:	 	Collis P. Chandler III
		 	General Partner	 		 		 	Its:	 	PresidentSecond Amendment to Office Building Lease

 EXHIBIT 10.28 
 SECOND AMENDMENT OF LEASE 
 THIS FIRST AMENDMENT OF LEASE (this “FIRST Amendment”) dated this 23rd day of October,
2002, is by and between 475 - 17TH STREET, CO., a Limited Partnership (“Landlord”) and Collis P. Chandler, III, (“Tenant”). 
 RECITALS: 
  

	A.	Landlord and Tenant entered into a certain Office Building Lease, dated January 31, 2000 (the “Base Lease”). The Base Lease, the First Amendment of Lease, and this
Second Amendment of Lease shall hereinafter be referred as “Lease” pertaining to certain premises located in the building commonly known as The 475 17th Street Building, Suite 860, 475 17th Street, Denver, Colorado 80202 (the
“Original Premises”), as more particularly described in the Lease. 

  

	B.	Terms defined in the Base Lease and delineated herein by initial capital letters shall have the same meaning ascribed thereto in the Lease except to the extent that the meaning of
such term is specifically modified by the provisions hereof. 

 NOW, THEREFORE, in consideration of the mutual covenants as hereinafter set
forth, and other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, the parties hereto agree as follows: 
  

	1.	Recitals: The foregoing recitals are true and correct and incorporated herein by this reference. 

  

	2.	Relocation and Expansion: Landlord agrees to allow Tenant to relocate with an expansion to Suite 1210 consisting of approximately 2,930 rentable square feet (r.s.f.)
(“Premises”). 

  

	3.	Term: The Primary Lease Term shall commence February 1, 2003, (“Commencement Date”) and terminate January 31, 2008 (the “Termination Date”).

  

	4.	Base Rate: Commencing February 1, 2003 and terminating January 31, 2008, the Base Rent shall be equal to the sum of Two Hundred Fifty-four Thousand Nine Hundred Ten
and 00/100 Dollars ($254,910.00) which sum shall be payable to Landlord as follows: 

 02/01/03 - 01/31/05 @ $17.00/rsf =
$4,150.83/mo 
 02/01/05 - 01/31/07 @ $17.50/rsf = $4,272.92/mo 
 02/01/07 - 01/31/08 @ $18.00/rsf = $4,395.00/mo 
  

	5.	Pro Rata Share: Tenant’s Pro Rata Share shall be 1.9204%. 

  

	6.	Tenant Improvements: Landlord hereby grants to Tenant a tenant finish allowance sufficient for the build out of Suite 1210 per the attached space plan. In addition,
Landlord agrees to relocate tenant from Suite 544 to Suite 1210. This relocation is for the physical moving of furniture located within the suite (excluding computer and telephone cabling). If Tenant requires Tenant Work in excess of the Tenant
Finish allowance described above, then Tenant agrees that it shall pay for these changes. 

  

	7.	 Right of Refusal: Provided Tenant has kept and performed all the terms, covenants, and conditions herein contained on its part to be performed, it shall,
subject and subordinate to 

	 	 
any existing tenant’s rights to renew or expand, affecting the Additional premises, have “Right of First Refusal” on Suite 1200 of the
Building. (Right of First Refusal of space hereinafter the “Additional Premises”). If Landlord desires to execute a Lease for the Additional Premises to a prospective tenant, Landlord shall, prior to execution of a lease, first notify
Tenant. Tenant shall have five (5) business days in which to notify Landlord in writing that it is exercising its Right of First Refusal. If Tenant fails to so notify Landlord or elects not to exercise its right then the offer at that point and
time shall become null and void and Landlord shall have all rights to continue its transaction with the prospective tenant. If Tenant elects to exercise its Right of First Refusal as to such Additional Premises, Tenant shall lease such Additional
Premises on terms negotiated at that time. 

  

	8.	Termination: Tenant shall have a one-time right to terminate this Lease effective at 12:01 a.m. February 1, 2006. Tenant shall notify Landlord in writing prior to
June 30, 2005 if Tenant decides to terminate. Upon termination, a fee equal to the sum of the unamortized tenant finish costs, architectural fees, mechanical and electrical engineering fees and commissions incurred by the Landlord in connection
herewith, together with an annual rate of return equal to 10% per annum (the “Termination fee”) shall be paid to Landlord. The unamortized costs shall be determined upon completion of construction. 

  

	9.	Security Deposit: Landlord agrees to hold on account the current security deposit of Eight Hundred Twenty-five Dollars and 42/100 ($825.42). 

  

	10.	Except as specifically amended by the provisions provided hereof, the terms and provisions in the Lease shall continue to govern the rights and obligations of the parties
thereunder, and all provisions and covenants of the Lease shall remain in full force and effect as stated therein. This Second Amendment of Lease, the First Amendment of Lease, and the Base Lease, shall be construed as one instrument.

  

	11.	The terms, provisions and covenants of this Second Amendment of Lease shall inure to the benefit of and be binding upon the parties hereto and their respective successors and
assigns. 

  

	12.	The Lease as amended by this Second Amendment and the First Amenment, contains all of the agreements of the parties hereto with respect to any matter covered or mentioned in the
Base Lease, as amended by this Second Amendment of Lease, and the First Amendment of Lease, and no prior agreement, understanding or representation pertaining to any such matter shall be effective for any purpose. No provision of the Lease may be
amended or added to except by an agreement in writing signed by the parties hereto or their respective successors in interest. 

 IN WITNESS
WHEREOF the parties hereto have executed this indenture by affixing their corporate seals by their authorized officers in that behalf, or by Tenant’s signature hereto, as of the date first above written. 
  

											
	 LANDLORD: 475 - 17th Street, Co.,
 a Colorado
limited partnership
	 		 	TENANT: Collis P. Chandler III
					
	By:	 	/s/ John Fletcher III	 		 	By:	 	/s/ Collis P. Chandler III
		 	John Fletcher III	 		 		 	Print:	 	Collis P. Chandler III
		 	General Partner	 		 		 	Its:	 	PresidentThird Amendment to Office Building Lease

 EXHIBIT 10.29 
 THIRD AMENDMENT OF LEASE 
 THIS THIRD AMENDMENT OF LEASE (this “THIRD Amendment”) dated this 28th day of June,
2004, is by and between 475 - 17TH STREET, CO., a Limited Partnership (“Landlord”) and Collis P. Chandler, III, (“Tenant”). 
 RECITALS: 
  

	A.	Landlord and Tenant entered into a certain Office Building Lease, dated January 31, 2000 (the “Base Lease”). The Base Lease, the First Amendment of Lease, the Second
Amendment of Lease and this Third Amendment of Lease shall hereinafter be referred as “Lease” pertaining to certain premises located in the building commonly known as The 475 17th Street Building, Suite 1210, 475 17th Street, Denver,
Colorado 80202 (the “Original Premises”), as more particularly described in the Lease. 

  

	B.	Terms defined in the Base Lease and delineated herein by initial capital letters shall have the same meaning ascribed thereto in the Lease except to the extent that the meaning of
such term is specifically modified by the provisions hereof. 

 NOW, THEREFORE, in consideration of the mutual covenants as hereinafter set
forth, and other good and valuable consideration, the receipt and adequacy of which is hereby acknowledged, the parties hereto agree as follows: 
  

	1.	Recitals: The foregoing recitals are true and correct and incorporated herein by this reference. 

  

	2.	Expansion: Landlord agrees to lease to Tenant Suite 1250 consisting of approximately 667 rentable square feet (r.s.f.) (“Premises”). 

  

	3.	Term: The Primary Lease Term shall be coterminous with the existing lease term commencing July 1, 2004, (“Commencement Date”) and terminating January 31,
2008 (the “Termination Date”). 

  

	4.	Base Rate: Commencing July 1, 2003 and terminating January 31, 2008, the Base Rent shall be equal to the sum of Forty-one Thousand Nine Hundred Sixty-five and
48/100 Dollars ($41,965.48) which sum shall be payable to Landlord as follows: 

  

			
	 07/01/04 - 01/31/05 @ $17.00/rsf =
	 	$ 944.92/mo
		
	 02/01/05 - 01/31/07 @ $17.50/rsf =
	 	$ 972.71/mo
		
	 02/01/07 - 01/31/08 @ $18.00/rsf =
	 	$1,000.50/mo

  

	5.	Pro Rata Share: Tenant’s Pro Rata Share shall be .4404%. 

  

	6.	Tenant Improvements: Landlord agrees to split the cost of furnishing three walls with cork board covered with wall covering. 

  

	7.	Name Change: Landlord accepts Tenants name change from Collis P. Chandler, III to Chandler Energy, LLC. 

	8.	Except as specifically amended by the provisions provided hereof, the terms and provisions in the Lease shall continue to govern the rights and obligations of the parties hereunder,
and all provisions and covenants of the Lease shall remain in full force and effect as stated therein. This Third Amendment of Lease, the Second Amendment of Lease, the First Amendment of Lease, and the Base Lease, shall be construed as one
instrument. 

  

	9.	The terms, provisions and covenants of this Third Amendment of Lease shall inure to the benefit of and be binding upon the parties hereto and their respective successors and
assigns. 

  

	10.	The Lease as amended by this Third Amendment, the Second Amendment and the First Amendment, contains all of the agreements of the parties hereto with respect to any matter covered
or mentioned in the Base Lease, as amended by this Third Amendment of Lease, the Second Amendment of Lease, and the First Amendment of Lease, and no prior agreement, understanding or representation pertaining to any such matter shall be effective
for any purpose. No provision of the Lease may be amended or added to except by an agreement in writing signed by the parties hereto or their respective successors in interest. 

 IN WITNESS WHEREOF the parties hereto have executed this indenture by affixing their corporate seals by their authorized officers in that behalf, or by Tenant’s
signature hereto, as of the date first above written. 
  

											
	 LANDLORD: 475 - 17th Street, Co.,
 a Colorado
limited partnership
	 		 	TENANT: Chandler Energy, LLC
					
	By:	 	/s/ John Fletcher III	 		 	By:	 	/s/ Collis P. Chandler III
		 	John Fletcher III	 		 		 	Print:	 	Collis P. Chandler III
		 	General Partner	 		 		 	Its:	 	President

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