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Exhibit 10.11    
  

6715
Kenilworth Avenue Partnership

1015 31st Street, NW

Washington, DC 20007 

	Reference:	Lease Agreement dated Sept. 1, 2000

Extension of Lease Agreement dated August 1, 2001

Amendment to Lease Agreement dated Oct. 29, 2001

Amendment to Lease Agreement dated May 1, 2002

Amendment to Lease Agreement dated July 24, 2002

March 1, 2003 Amendment to Lease Agreement  

        Cogent Communications, Inc. (Tenant) and 6715 Kenilworth Avenue Partnership (Landlord) hereby agree to modify the square foot rental and the associated
monthly and aggregate rental payment amounts pertaining to the Lease Term commencing September 1, 2002 and expiring August 31, 2003 of the Lease Agreement dated September 1, 2001,
as amended (Lease Agreement), so that Tenant will rent 15,369 square feet at a Fixed Annual Rent of $24 per square foot ($368,856 on an annualized
basis), payable in six (6) equal monthly installments of $30,738 for the remainder of the current Lease Term, as indicated below: 

	Rent Payment	 	 	 	1015 31st St
	

 	

 	
 	
 	

 	
 	

 
	Floor
	 	 	Square Feet

	3	 	 	 	0	 	 
	4	 	 	 	5,123	 	 
	5	 	 	 	5,123	 	 
	6	 	 	 	5,123	 	 
	 	 	 	

	Total Sq. Feet	 	 	 	15,369	 	 
	 	 	 	

	Total Annual Rent	 	 	$	368,856	 	 
	 	 	 	

	Total Monthly Rent	 	 	$	30,738	 	 
	 	 	 	

Except as amended herein, the Lease Agreement, as amended, shall remain in full force and effect. 

	
TENANT: Cogent Communications, Inc	
 	

 
	

 	
 	

 
	/s/Thaddeus G. Weed
 Thaddeus G. Weed

Vice President, Controller	 	 
	

 	
 	

 
	LANDLORD: 6715 Kenilworth Avenue Partnership
	

 	
 	

 
	/s/Dave Schaeffer
 Dave Schaeffer

General Partner

	 	 

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Exhibit 10.17    
  

 
 

CLOSING DATE AGREEMENT    
  

        THIS CLOSING DATE AGREEMENT made this 6th day of March 2003 by and among Cogent Communications
Group, Inc., a Delaware corporation (the "Company"), Allied Riser Communications Corporation, a Delaware corporation
("Allied Riser"), the several noteholders (the "Noteholders") party to the Exchange Agreement and the
Settlement Agreement (each as defined below), and Gary Wolfe as representative for the Noteholders (the "Noteholder Representative"). The Company,
Allied Riser, and the Noteholders are sometimes referred to herein together collectively as the "Parties." 

W I T N E S S E T H:  

        WHEREAS, the Noteholders hold in the aggregate $106,789,000 face value of the 7.5% Convertible Subordinated Notes Due 2007 of Allied Riser (the
"Notes"). 

        WHEREAS,
the Company, Allied Riser and Noteholders have entered into that certain Exchange Agreement dated as of the date hereof (the "Exchange
Agreement") pursuant to which the Noteholders have agreed to surrender to Allied Riser 100% of the Notes in exchange for a cash payment by Allied Riser (the
"Cash Payment") and the delivery by Allied Riser to the Noteholders of shares of the Company's Series D Preferred Stock and Series E
Preferred Stock (the "Shares") on the terms and subject to the conditions set forth therein (such transaction is referred to herein as the
"Note Exchange"). 

        WHEREAS,
the Company, Allied Riser and Noteholders have entered into that certain Settlement Agreement dated as of the date hereof (the "Settlement
Agreement") pursuant to which the Noteholders have agreed to dismiss with prejudice certain claims asserted by them in a litigation pending in the Court of Chancery of the
State of Delaware (the "Litigation") against Allied Riser and certain of its former directors and to release all claims against Allied Riser and the
Company in exchange for a cash payment by Allied Riser (the "Settlement Payment") and the Company and Allied Riser have agreed to release all claims
against the Noteholders by the Company and Allied Riser on the terms and conditions set forth therein (such transaction is referred to herein as the
"Settlement"). 

        WHEREAS,
the Stipulation of Dismissal (as defined in the Settlement Agreement) related to the dismissal of the Litigation has been filed in the Court of Chancery of the State of Delaware
in and for New Castle County. 

        WHEREAS,
in order to effect the release of claims in connection with the Settlement, each of the Noteholders, Allied Riser, the Company and certain of Allied Riser's former directors
(the "Allied Riser Directors") have executed a mutual general release (the "General Release"). 

        WHEREAS,
pursuant to the terms of the Exchange Agreement and the Settlement Agreement, the Cash Payment, the Settlement Payment, the Notes and the General Release are to be placed in
escrow upon the execution of the Exchange Agreement and the Settlement Agreement. 

        WHEREAS,
pursuant to the terms of the Exchange Agreement and the Settlement Agreement upon the filing with the Delaware Secretary of State of the Third Amended and Restated Certificate
of Incorporation of the Company authorizing the Shares (the "Charter Amendment"), Allied Riser is to place the Shares into the escrow. 

        WHEREAS,
the Charter Amendment has been filed with the Secretary of State of the State of Delaware. 

        WHEREAS,
the parties desire to enter into this Closing Date Agreement to provide for a closing of the Note Exchange and the Settlement without first placing the Cash Payment, the
Settlement Payment, the Notes, the General Release or the Shares into Escrow. 

 

        NOW,
THEREFORE, in consideration of the mutual covenants and agreements set forth herein and in the Exchange Agreement and the Settlement Agreement, the Parties agree as follows: 

        On
the date hereof: 

        a)    Allied
Riser shall (i) wire to the account of the Noteholder Representative set forth in Schedule A hereto
the Cash Payment of $4,997,725 and the Settlement Payment of $4,880,256, (ii) deliver to the Noteholder Representative duly executed certificates, in the names of each of the Noteholders,
representing the number of duly authorized, validly issued, fully paid and non-assessable Shares set forth opposite each Noteholders name under the headings "Series D Preferred" and
"Series E Preferred" on Schedule 1.1 to the Exchange Agreement and (iii) deliver to the Noteholder Representative the General
Release executed by Allied Riser and the Allied Riser Directors. 

        b)    The
Company shall deliver to the Noteholder Representative the General Release executed by the Company. 

        c)    The
Noteholders shall (i) instruct their respective brokers to instruct the Depository Trust Company ("DTC") to
transfer the Notes from the account of each Noteholder to the account of Allied Riser set forth in Schedule B hereto, and (ii) deliver to
Allied Riser the General Release executed by each Noteholder and Angelo, Gordon & Co. L.P. The Noteholder Representative shall provide a certification to Allied Riser that all of the
Noteholders have duly instructed their respective brokers to instruct the DTC to transfer the Notes and such instructions have not be rescinded or amended and remain in full force and effect. 

[Signature Pages Follow]

2

 

        IN
WITNESS WHEREOF, the parties hereto have caused this CLOSING DATE AGREEMENT to be executed as of the date first written above. 

	 	 	ALLIED RISER COMMUNICATIONS CORPORATION
	

 	
 	

/s/  DAVID SCHAEFFER      

	 	 	By:	David Schaeffer
	 	 	Title:	Chief Executive Officer
	

 	
 	

COGENT COMMUNICATIONS GROUP, INC.
	

 	
 	

/s/  DAVID SCHAEFFER      

	 	 	By:	David Schaeffer
	 	 	Title:	Chief Executive Officer
	

 	
 	

/s/  GERALD K. DINSMORE      
 GERALD K. DINSMORE
	

 	
 	

/s/  R. DAVID SPRENG      
 R. DAVID SPRENG
	

 	
 	

/s/  DONALD LYNCH      
 DONALD LYNCH
	

 	
 	

/s/  BLAIR P. WHITAKER      
 BLAIR P. WHITAKER
	

 	
 	

ANDA PARTNERSHIP

By it Partners
	

 	
 	

 	

THE ANN ONLY TRUST
	

 	
 	

 	

/s/  MARK SLEZAK      

	 	 	 	By: Mark Slezak
	 	 	 	Title: Co-Trustee
	

 	
 	

 	

THE ANN AND DESCENDANTS TRUST
	

 	
 	

 	

/s/  MARK SLEZAK      

	 	 	 	By: Mark Slezak
	 	 	 	Title: Co-Trustee
	

 	
 	

CRT CAPITAL GROUP, LLC
	

 	
 	

/s/  C. MICHAEL VAUGHN      

	 	 	By:	C. Michael Vaughn
	 	 	Title:	Member
	

 	
 	

GUARDFISH, LLC
	

 	
 	

/s/  JOHN C. KOPCHIK      

	 	 	By:	John C. Kopchik
	 	 	Title:	Principal of its Manager, Providence Asset Management LLC

3

 

	

 	
 	

HBV MASTER REDISCOVERY OPPORTUNITIES FUND, L.P.
	

 	
 	

/s/  GEORGE J. KONOMOS      

	 	 	By:	George J. Konomos
	 	 	Title:	Portfolio Manager
	

 	
 	

JMG CAPITAL PARTNERS, L.P.
	

 	
 	

/s/  JOHNATHAN GLASER      

	 	 	By:	Jonathan Glaser
	 	 	Title:	Managing Member
	

 	
 	

JMG TRITON OFFSHORE FUND, LTD.
	

 	
 	

/s/  JOHNATHAN GLASER      

	 	 	By:	Jonathan Glaser
	 	 	Title:	Managing Member
	

 	
 	

MARKETUS VALUE PARTNERS, L.P.
	

 	
 	

/s/  EDMUND A. HAJIM      

	 	 	By:	Edmund A. Hajim
	 	 	Title:	Managing Member of its General Partner, Marketus, L.L.C.
	

 	
 	

LA POLICE AND FIRE PENSION FUND

By its Manager,

WR HUFF & CO.
	

 	
 	

/s/  MICHAEL J. MCGUINESS      

	 	 	By:	Michael J. McGuiness
	 	 	Title:	Portfolio Manager
	

 	
 	

PENINSULA INVESTMENT PARTNERS, L.P.
	

 	
 	

/s/  R. TED WESCHLER      

	 	 	By:	R. Ted Weschler
	 	 	Title:	Managing Member of its Investment Advisor and General Partner
	

 	
 	

SAGAMORE HILL HUB FUND LTD.
	

 	
 	

/s/  MARK MAY      

	 	 	By:	Mark May
	 	 	Title:	 
	

 	
 	

LC CAPITAL MASTER FUND, LTD.
	

 	
 	

/s/  STEVE LAMPE      

	 	 	By:	Steve Lampe
	 	 	Title:	Managing Member

4

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Exhibit 10.17

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Exhibit 10.18    
  

 
 

GENERAL RELEASE    
  

        This General Release (this "Release") is entered into as of March 6, 2003 by and among Cogent
Communications Group, Inc., a Delaware corporation (the "Company"), Allied Riser Communications Corporation, a Delaware corporation
("Allied Riser"), Gerald K. Dinsmore, R. David Spreng, Donald Lynch, and Blair P. Whitaker (Messrs. Dinsmore, Spreng, Lynch and Whitaker
collectively, the "Allied Riser Directors"), and the several noteholders that are signatories hereto (such noteholders each individually a
"Noteholder" and collectively the "Noteholders"). 

 
 

RECITALS    
  

        WHEREAS, the Noteholders hold in the aggregate $106,789,000 face value of the 7.5% Convertible Subordinated Notes Due 2007 issued by Allied Riser (the
"Notes") pursuant to a certain Indenture, dated as of June 28, 2000, between Allied Riser and Wilmington Trust Company (the "Indenture"), as
supplemented pursuant to a certain First Supplemental Indenture, dated as of February 4, 2002 (the "Supplemental Indenture"); 

        WHEREAS,
Allied Riser is the wholly-owned subsidiary of the Company as the result of a merger consummated February 4, 2002 (the
"Merger") pursuant to which the Company became co-obligor with respect to certain obligations related to the Notes under the Indenture and
the Supplemental Indenture governing the Notes; 

        WHEREAS,
certain of the Noteholders are plaintiffs in the action against Allied Riser and certain of its former directors styled as Angelo, Gordon & Co., L.P., JMG Capital
Partners, LLC, Sagamore Hill Hub Fund, LTD., JMG Triton Offshore Fund, LTD., Peninsula Capital Advisors, LLC, Guardfish LLC and Anda Partnership v. Allied Riser Communications
Corporation, a Delaware corporation, Gerald K.
Dinsmore, R. David Spreng, Donald Lynch, and Blair P. Whitaker (Messrs. Dinsmore, Spreng, Lynch and Whitaker collectively, the "Allied Riser
Directors"), (C.A. No. 19298), in the Court of Chancery of the State of Delaware in and for New Castle County (the "Noteholder
Litigation"); 

        WHEREAS,
there is no plaintiff in the Noteholder Litigation that is not a party to this Release; 

        WHEREAS,
certain of the Noteholders filed an involuntary petition against Allied Riser in the Bankruptcy Court for the Northern District of Texas, Dallas Division (Case
No. 02-32607-SAF-7) (the "Bankruptcy Litigation"); 

        WHEREAS,
the Company, Allied Riser and the Noteholders have entered into that certain Settlement Agreement dated March    , 2003 (the "Settlement
Agreement") pursuant to which, among other things, (a) the Noteholders agreed to dismiss with prejudice the Noteholder Litigation and to enter into a general release of
certain claims by the Noteholders against Allied Riser, the Company and the Allied Riser Directors (the "Noteholder Release"), (b) Allied Riser
agreed to make a cash payment to the Noteholders, (c) Allied Riser agreed to enter into a general release of certain claims by Allied Riser against the Noteholders (the
"Allied Riser Release"), (d) the Company agreed to enter into a general release of certain claims by the Company against the Noteholders (the
"Company Release"), and (e) Allied Riser and the Company agreed to cause each of the Allied Riser Directors to enter into a general release with
the Noteholders (the "Allied Riser Director Releases"); and 

        WHEREAS,
the parties have further agreed that each shall deliver this Release into escrow upon the execution of the Settlement Agreement which escrow shall be governed by the terms and
conditions of that certain Escrow Agreement entered into by the Company, Allied Riser, the Noteholders and the Escrow Agent thereunder dated March    , 2003 (the
"Escrow Agreement"). 

1

 

        NOW,
THEREFORE, in consideration of the mutual promises, agreements and releases contained herein and the mutual execution and performances of the Settlement Agreement, the parties agree
as follows: 

AGREEMENT  

        1.    Allied
Riser and the Company hereby release, remise and forever discharge each Noteholder and, as the case may be, its partners, members or stockholders, each of their
associates, owners, members, affiliates, divisions, subsidiaries, predecessors, successors, heirs, assigns, agents, directors, officers, partners, employees, insurers, representatives, counsel and all
persons acting by, through, under or in concert with them, or any of them (collectively, the "Noteholder Releasees"), of and from any and all manner of
action or actions, cause or causes of action, in law or in equity, suits, debts, liens, contracts, agreements, promises, liability, claims, demands, damages, loss, cost or expense, of any nature
whatsoever, known or unknown, fixed or contingent (hereinafter called "Claims") that Allied Riser or the Company, or any of their officers, directors,
stockholders, successors or assigns, now have or may hereafter have against the Noteholder Releasees, or any of them, that arise out of or in connection with the Indenture, the Supplemental Indenture,
the Notes, the Merger, the Noteholder Litigation, or the Bankruptcy Litigation, including without limitation, any counterclaims that were made, or that could have been made, in the Noteholder
Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the "Allied Riser and Company Released Claims"). 

        2.    Allied
Riser and the Company further covenant and promise that neither will file, pursue or bring any Allied Riser and Company Released Claim in any judicial or other
forum against any one or more of the Noteholder Releasees, provided, however, that nothing contained herein shall be construed or deemed to release any covenants contained in, or claims for breach by
any Noteholder of any of its representations, warranties, covenants and obligations under this Release, the Settlement Agreement, the Escrow Agreement, or that certain Exchange Agreement dated March
    , 2003 by and among the Company, Allied Riser and the Noteholders (the "Exchange Agreement"). 

        3.    Allied
Riser and the Company each acknowledge that it has been advised by legal counsel that this Release extends to Allied Riser and Company Released Claims that Allied
Riser and the Company do not know or suspect to exist in their respective favors at the time of execution of this Release, which if known by them might have materially affected Allied Riser and the
Company. Allied Riser and the Company, being so advised, hereby expressly waive any rights each may have to such unknown Claims. 

        4.    Allied
Riser and the Company each expressly agree and declare that each has voluntarily agreed to release and discharge all Allied Riser and Company Released Claims of
its free will and accord, acting upon its own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        5.    Mr. Dinsmore
hereby releases, remises and forever discharges the Noteholder Releasees, of and from any and all manner of Claims that Mr. Dinsmore or any of
his heirs, executors administrators, successors or assigns now has or may hereafter have against the Noteholder Releasees, or any of them, that arise out of or in connection with the Indenture, the
Supplemental Indenture, the Notes, the Merger, the Noteholder Litigation, or the Bankruptcy Litigation, including without limitation, any counterclaims that were made, or that could have been made, in
the Noteholder Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the "Dinsmore Released Claims"). 

        6.    Mr. Dinsmore
further covenants and promises that he will not file, pursue or bring any Dinsmore Released Claim in any judicial or other forum against any one or
more of the Noteholder Releasees. 

2

 

        7.    Mr. Dinsmore
acknowledges that he has been advised by legal counsel that this Release extends to Dinsmore Released Claims that Mr. Dinsmore does not know or
suspect to exist in his favor at the time of execution of this Release, which if known by him might have materially affected him. Mr. Dinsmore, being so advised, hereby expressly waives any
rights he may have to such unknown Claims. 

        8.    Mr. Dinsmore
expressly agrees and declares that he has voluntarily agreed to release and discharge all Dinsmore Released Claims of his free will and accord, acting
upon his own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        9.    Mr. Spreng
hereby releases, remises and forever discharges the Noteholder Releasees, of and from any and all manner of Claims that Mr. Spreng or any of his
heirs, executors administrators, successors or assigns now has or may hereafter have against the Noteholder Releasees, or any of them, that arise out of or in connection with the Indenture, the
Supplemental Indenture, the Notes, the Merger, the Noteholder Litigation, or the Bankruptcy Litigation, including without limitation, any counterclaims that were made, or that could have been made, in
the Noteholder Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the "Spreng Released Claims"). 

        10.  Mr. Spreng
further covenants and promises that he will not file, pursue or bring any Spreng Released Claim in any judicial or other forum against any one or more
of the Noteholder Releasees. 

        11.  Mr. Spreng
acknowledges that he has been advised by legal counsel that this Release extends to Spreng Released Claims that Mr. Spreng does not know or
suspect to exist in his favor at the time of execution of this Release, which if known by him might have materially affected him. Mr. Spreng, being so advised, hereby expressly waives any
rights he may have to such unknown Claims. 

        12.  Mr. Spreng
expressly agrees and declares that he has voluntarily agreed to release and discharge all Spreng Released Claims of his free will and accord, acting
upon his own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        13.  Mr. Lynch
hereby releases, remises and forever discharges the Noteholder Releasees, of and from any and all manner of Claims that Mr. Lynch or any of his
heirs, executors administrators, successors or assigns now has or may hereafter have against the Noteholder Releasees, or any of them, that arise out of or in connection with the Indenture, the
Supplemental Indenture, the Notes, the Merger, the Noteholder Litigation, or the Bankruptcy Litigation, including without limitation, any counterclaims
that were made, or that could have been made, in the Noteholder Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the "Lynch Released
Claims"). 

        14.  Mr. Lynch
further covenants and promises that he will not file, pursue or bring any Lynch Released Claim in any judicial or other forum against any one or more of
the Noteholder Releasees. 

        15.  Mr. Lynch
acknowledges that he has been advised by legal counsel that this Release extends to Lynch Released Claims that Mr. Lynch does not know or suspect
to exist in his favor at the time of execution of this Release, which if known by him might have materially affected him. Mr. Lynch, being so advised, hereby expressly waives any rights he may
have to such unknown Claims. 

        16.  Mr. Lynch
expressly agrees and declares that he has voluntarily agreed to release and discharge all Lynch Released Claims of his free will and accord, acting upon
his own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        17.  Mr. Whitaker
hereby releases, remises and forever discharges the Noteholder Releasees, of and from any and all manner of Claims that Mr. Whitaker or any of
his heirs, executors administrators, successors or assigns now has or may hereafter have against the Noteholder Releasees, or any of them, that arise out of or in connection with the Indenture, the
Supplemental Indenture, the Notes, the Merger, the Noteholder Litigation, or the Bankruptcy Litigation, including without limitation, any 

3

 

counterclaims that were made, or that could have been made, in the Noteholder Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the
"Whitaker Released Claims"). 

        18.  Mr. Whitaker
further covenants and promises that he will not file, pursue or bring any Whitaker Released Claim in any judicial or other forum against any one or
more of the Noteholder Releasees. 

        19.  Mr. Whitaker
acknowledges that he has been advised by legal counsel that this Release extends to Whitaker Released Claims that Mr. Whitaker does not know
or suspect to exist in his favor at the time of execution of this Release, which if known by him might have materially affected him. Mr. Whitaker, being so advised, hereby expressly waives any
rights he may have to such unknown Claims. 

        20.  Mr. Whitaker
expressly agrees and declares that he has voluntarily agreed to release and discharge all Whitaker Released Claims of his free will and accord,
acting upon his own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        21.  Each
Noteholder hereby releases, remises and forever discharges each of Allied Riser, the Company and the Allied Riser Directors, and, as the case may be, each of their
stockholders, associates, owners, members, affiliates, divisions, subsidiaries, predecessors, successors, heirs, assigns, agents, directors, officers, partners, employees, insurers, representatives,
counsel and all persons acting by, through, under or in concert with them, or any of them (collectively, the "Company-Side Releasees"), of
and from any and all manner of Claims that any individual Noteholder or the Noteholders collectively, or any of their partners, members, stockholders, successors or assigns, now have or may hereafter
have against the Company-Side Releasees, or any of them, that arise out of or in connection with the Indenture, the Supplemental Indenture, the Notes, the Merger, the Noteholder
Litigation, or the Bankruptcy Litigation, including without limitation, any claims for corporate waste or mismanagement, violations of federal securities law and any allegations that were made, or
that could have been made, and counterclaims that could have been made in the Noteholder Litigation or the Bankruptcy Litigation, from the beginning of time to the date hereof (the
"Noteholder Released Claims"). 

        22.  Each
Noteholder further covenants and promises that it will not file, pursue or bring any Noteholder Released Claim in any judicial or other forum against any one or
more of the Company-Side Releasees, provided, however, that nothing contained herein shall be construed or deemed to release any covenants contained in, or claims for breach by Allied
Riser or the Company of any of their respective representations, warranties, covenants and obligations under the Settlement Agreement, the Exchange Agreement or the Escrow Agreement. 

        23.  Each
Noteholder acknowledges that it has been advised by legal counsel that this release extends to Noteholder Released Claims that such Noteholder does not know or
suspect to exist in its favor at the time of execution of this Release, which if known by such Noteholder might have materially affected such Noteholder. Each Noteholder, being so advised, hereby
expressly waives any rights each may have to such unknown claims. 

        24.  Each
Noteholder expressly agrees and declares that it has voluntarily agreed to release and discharge all Noteholder Released Claims of its free will and accord, acting
upon its own volition and that entering into this Release is not an admission of liability on the part of any party to this Release. 

        25.  The
parties hereto acknowledges that each and every provision of this Release constitutes material consideration for the mutual obligations and promises set forth
herein. 

        26.  This
Release, together with the Settlement Agreement, represents the entire agreement and understanding among the parties with respect to the terms of the Noteholder
Releases and the Allied Riser Releases, Company Releases and the Allied Riser Director Releases and prevails over prior 

4

 

communications between the parties and their representatives about the terms of the Release. This Release was drafted and reviewed by counsel for both parties and neither party shall be considered
the drafter for purposes of construing any ambiguity in the Release. 

        27.  This
Release is binding upon the parties hereto and their respective past, present or future parents, subsidiaries, affiliates, predecessors, successors, transferees,
assigns, representatives, principals, agents, officers, directors, and employees. 

        28.  This
Release may be executed in any number of identical counterparts each of which shall be deemed an original, and all of which together shall constitute a single
agreement. 

        29.  This
Agreement shall be governed by the internal laws of the State of New York without regard to its conflict of law principles. 

[Remainder of this page intentionally left blank; signature page follows]

5

   
        IN WITNESS WHEREOF, the parties hereto have caused this GENERAL RELEASE to be executed as of the date first above written. 

	 	 	ALLIED RISER COMMUNICATIONS CORPORATION
	

 	
 	

/s/  DAVID SCHAEFFER      

	 	 	By:	David Schaeffer
	 	 	Title:	Chief Executive Officer
	

 	
 	

COGENT COMMUNICATIONS GROUP, INC.
	

 	
 	

/s/  DAVID SCHAEFFER      

	 	 	By:	David Schaeffer
	 	 	Title:	Chief Executive Officer
	

 	
 	

/s/  GERALD K. DINSMORE      
 GERALD K. DINSMORE
	

 	
 	

/s/  R. DAVID SPRENG      
 R. DAVID SPRENG
	

 	
 	

/s/  DONALD LYNCH      
 DONALD LYNCH
	

 	
 	

/s/  BLAIR P. WHITAKER      
 BLAIR P. WHITAKER
	

 	
 	

ANDA PARTNERSHIP

By it Partners
	

 	
 	

 	

THE ANN ONLY TRUST
	

 	
 	

 	

/s/  MARK SLEZAK      

	 	 	 	By: Mark Slezak
	 	 	 	Title: Co-Trustee
	

 	
 	

 	

THE ANN AND DESCENDANTS TRUST
	

 	
 	

 	

/s/  MARK SLEZAK      

	 	 	 	By: Mark Slezak
	 	 	 	Title: Co-Trustee
	

 	
 	

CRT CAPITAL GROUP, LLC
	

 	
 	

/s/  C. MICHAEL VAUGHN      

	 	 	By:	C. Michael Vaughn
	 	 	Title:	Member
	

 	
 	

GUARDFISH, LLC
	

 	
 	

/s/  JOHN C. KOPCHIK      

	 	 	By:	John C. Kopchik
	 	 	Title:	Principal of its Manager, Providence Asset Management LLC

S-1

 

	

 	
 	

ANGELO, GORDON & CO., L.P.
	

 	
 	

/s/  MICHAEL L. GORDON      

	 	 	By:	Michael L. Gordon
	 	 	Title:	Authorized Signatory
	

 	
 	

HBV MASTER REDISCOVERY OPPORTUNITIES FUND, L.P.
	

 	
 	

/s/  GEORGE J. KONOMOS      

	 	 	By:	George J. Konomos
	 	 	Title:	Portfolio Manager
	

 	
 	

JMG CAPITAL PARTNERS, L.P.
	

 	
 	

/s/  JOHNATHAN GLASER      

	 	 	By:	Jonathan Glaser
	 	 	Title:	Managing Member
	

 	
 	

JMG TRITON OFFSHORE FUND, LTD.
	

 	
 	

/s/  JOHNATHAN GLASER      

	 	 	By:	Jonathan Glaser
	 	 	Title:	Managing Member
	

 	
 	

MARKETUS VALUE PARTNERS, L.P.
	

 	
 	

/s/  EDMUND A. HAJIM      

	 	 	By:	Edmund A. Hajim
	 	 	Title:	Managing Member of its General Partner, Marketus, L.L.C.
	

 	
 	

LA POLICE AND FIRE PENSION FUND

By its Manager,

WR HUFF & CO.
	

 	
 	

/s/  MICHAEL J. MCGUINESS      

	 	 	By:	Michael J. McGuiness
	 	 	Title:	Portfolio Manager
	

 	
 	

PENINSULA INVESTMENT PARTNERS, L.P.
	

 	
 	

/s/  R. TED WESCHLER      

	 	 	By:	R. Ted Weschler
	 	 	Title:	Managing Member of its Investment Advisor and General Partner
	

 	
 	

SAGAMORE HILL HUB FUND LTD.
	

 	
 	

/s/  MARK MAY      

	 	 	By:	Mark May
	 	 	Title:	 
	

 	
 	

LC CAPITAL MASTER FUND, LTD.
	

 	
 	

/s/  STEVE LAMPE      

	 	 	By:	Steve Lampe
	 	 	Title:	Managing Member

S-2

QuickLinks

Exhibit 10.18

GENERAL RELEASE

RECITALS

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