Document:

Exhibit 10.3

 Exhibit 10.3 
 SECOND AMENDED AND RESTATED SUBSIDIARIES GUARANTY 
 SECOND AMENDED AND RESTATED SUBSIDIARIES
GUARANTY, dated as of May 25, 2007 (as amended, modified or supplemented from time to time, this “Guaranty”), made by each of the undersigned guarantors (each, a “Guarantor” and, together with any other entity
that becomes a party hereto pursuant to Section 26 hereof, the “Guarantors”). (Except as otherwise defined herein, capitalized terms used herein and defined in the Credit Agreement (as defined below) shall be used herein as
therein defined.) 
 W I T N E S S E T H : 
 WHEREAS, Host Hotels & Resorts, L.P. (formerly known as Host Marriott, L.P.), a Delaware limited partnership (the “U.S. Borrower”), each Canadian Revolving Loan Borrower from time to time
party thereto, various lenders from time to time party thereto, and Deutsche Bank Trust Company Americas, as Administrative Agent, have entered into a Credit Agreement dated as of June 6, 2002, as amended and restated on September 10, 2004
(the “Original Credit Agreement”), as amended by the Second Amended and Restated Credit Agreement as of the date hereof among Host Hotels, L.P., a Delaware limited partnership, the U.S. Subsidiary Borrower listed therein, each
Canadian Revolving Loan Borrower from time to time party thereto (together with the U.S. Borrower and the U.S. Subsidiary Borrower, the “Borrowers”), various lenders from time to time party thereto (the “Lenders”)
and Deutsche Bank AG New York Branch (the “Administrative Agent”) (as the same may be amended, modified, extended, renewed, replaced, restated, supplemented or refinanced from time to time, and including any agreement extending the
maturity of, or refinancing or restructuring, including, but not limited to, the inclusion of additional borrowers or guarantors thereunder or any increase in the amount borrowed, the “Credit Agreement”), providing for the making of
Revolving Loans and other extensions of credit to the Borrowers as contemplated therein (the Lenders, the Administrative Agent and the Collateral Agent are herein called the “Lender Creditors”); 
 WHEREAS, each Borrower may at any time and from time to time enter into one or more Interest Rate Protection Agreements or Other Hedging Agreements each
of which by its terms requires the obligations of such Borrower under such Interest Rate Protection Agreement or Other Hedging Agreement to be guaranteed pursuant to this Guaranty (“Guaranteed Hedging Agreement”) with one or more
Lenders or any affiliate thereof (each such Lender or affiliate, even if the respective Lender subsequently ceases to be a Lender under the Credit Agreement for any reason, together with such Lender’s or affiliate’s successors and assigns,
if any, collectively, the “Other Creditors,” and together with the Lender Creditors, are herein called the “Creditors”); 
 WHEREAS, each Guarantor is a direct or an indirect Subsidiary of the U.S. Borrower; 

 WHEREAS, it was a condition to the making of revolving loans and other extensions of credit under the
Original Credit Agreement that the guarantors party to the Guaranty Agreement dated as of June 6, 2002, as amended and restated on September 10, 2004, as further amended or supplemented prior to the date hereof (the “Original
Guaranty”) shall have executed and delivered the Original Guaranty; and 
 WHEREAS, it is a condition to the making of Revolving
Loans and other extensions of credit under the Credit Agreement that each Guarantor shall have amended and restated the Original Guaranty as provided herein; and 
 WHEREAS, each Guarantor will obtain benefits from the incurrence of Revolving Loans by, and other extensions of credit to, the Borrowers under the Credit Agreement and the entering into by the U.S. Borrower of the
Guaranteed Hedging Agreements referred to above and, accordingly, desires to execute this Guaranty in order to satisfy the conditions described in the preceding paragraph; 
 NOW, THEREFORE, in consideration of the foregoing and other benefits accruing to each Guarantor, the receipt and sufficiency of which are hereby
acknowledged, each Guarantor hereby amends and restates the Original Guaranty in its entirety as set forth herein: 
 1. Each Guarantor,
jointly and severally, absolutely, irrevocably and unconditionally guarantees: (i) to the Lender Creditors the full and prompt payment when due (whether at the stated maturity, by acceleration or otherwise) of (x) the principal of and
interest on the Notes issued by, and the Revolving Loans made to, each Borrower under the Credit Agreement and the reimbursement obligations in respect of all Letters of Credit and (y) all other obligations (including obligations which, but for
the automatic stay under Section 362(a) of the Bankruptcy Code, would become due) and liabilities owing by the Borrowers to the Lender Creditors under the Credit Agreement and each other Credit Document to which any of the Borrowers is a party
(including, without limitation, indemnities, Fees and interest thereon), whether now existing or hereafter incurred under, arising out of or in connection with the Credit Agreement and each such other Credit Document and the due performance and
compliance by the Borrowers with all of the terms, conditions and agreements contained in the Credit Agreement and in each such other Credit Document (all such principal, interest, liabilities and obligations being herein collectively called the
“Credit Agreement Obligations”); and (ii) to each Other Creditor, the full and prompt payment when due (whether at the stated maturity, by acceleration or otherwise) of all obligations (including obligations which, but for the
automatic stay under Section 362(a) of the Bankruptcy Code, would become due) and liabilities owing by the Borrower under any Guaranteed Hedging Agreement, whether now in existence or hereafter arising, and the due performance and compliance by
the Borrower with all of the terms, conditions and agreements contained in the Guaranteed Hedging Agreements (all such obligations and liabilities being herein collectively called the “Other Obligations” and, together with the
Credit Agreement Obligations, are herein collectively called the “Guaranteed Obligations”). Each Guarantor understands, agrees and confirms that the Creditors may enforce this Guaranty up to the full amount of the Guaranteed
Obligations against each Guarantor without proceeding against any other Guarantor, against any Borrower, against any security for the Guaranteed Obligations, or under any other guaranty covering all or a portion of the Guaranteed Obligations.

 2. Additionally, each Guarantor, jointly and severally, absolutely, unconditionally and irrevocably,
guarantees the payment of any and all Guaranteed Obligations to the Creditors whether or not due or payable by the Borrowers upon the occurrence in respect of any of the Borrowers of any of the events specified in Section 12.05 of the Credit
Agreement, and absolutely, unconditionally and irrevocably, jointly and severally, promises to pay such Guaranteed Obligations to the Creditors, or order, on demand, in lawful money of the United States or in such other currency as may be required
by the Credit Agreement. This Guaranty shall constitute a guaranty of payment, and not of collection. 
 3. The liability of each Guarantor
hereunder is exclusive and independent of any security for or other guaranty of the indebtedness of the Borrowers, whether executed by such Guarantor, any other Guarantor, any other guarantor or any other party, and the liability of each Guarantor
hereunder shall not be affected or impaired by any circumstance or occurrence whatsoever, including, without limitation: (a) any direction as to application of payment by the Borrowers or by any other party, (b) any other continuing or
other guaranty, undertaking or maximum liability of a guarantor or of any other party as to the indebtedness of the Borrowers, (c) any payment on or in reduction of any such other guaranty or undertaking except to the extent that any such
payment or reduction results in the actual permanent reduction of the Guaranteed Obligations, (d) any dissolution, termination or change in personnel by any Borrower, (e) any payment made to any Creditor on the indebtedness which any
Creditor repays any Borrower pursuant to court order in any bankruptcy, reorganization, arrangement, moratorium or other debtor relief proceeding, or otherwise, and each Guarantor waives any right to the deferral or modification of its obligations
hereunder by reason of any such proceeding, (f) any action or inaction by the Creditors as contemplated in Section 6 hereof, or (g) any invalidity, irregularity or unenforceability of all or part of the Guaranteed Obligations or of
any security therefor. 
 4. The obligations of each Guarantor hereunder are independent of the obligations of any other Guarantor, any other
guarantor or any Borrower, and a separate action or actions may be brought and prosecuted against each Guarantor whether or not action is brought against any other Guarantor, any other guarantor or any Borrower and whether or not any other
Guarantor, any other guarantor or any Borrower be joined in any such action or actions. Each Guarantor waives, to the fullest extent permitted by law, the benefit of any statute of limitations affecting its liability hereunder or the enforcement
thereof. Any payment by a Borrower or other circumstance which operates to toll any statute of limitations as to such Borrower shall operate to toll the statute of limitations as to each Guarantor. 
 5. Each Guarantor hereby waives notice of acceptance of this Guaranty and notice of any liability to which it may apply, and waives promptness,
diligence, presentment, demand of payment, protest, notice of dishonor or nonpayment of any such liabilities, suit or taking of other action by the Administrative Agent or any other Creditor against, and any other notice to, any party liable thereon
(including such Guarantor, any other guarantor or any Borrower). 
 6. Any Creditor may at any time and from time to time without the consent
of, or notice to, any Guarantor, without incurring responsibility to such Guarantor, and without impairing or releasing the obligations of such Guarantor hereunder, upon or without any terms or conditions and in whole or in part: 
 (a) change the manner, place or terms of payment of, and/or change or extend the time of payment of, renew or alter, any of the Guaranteed Obligations
(including any increase or decrease in the rate of interest thereon), any security therefor, or any liability incurred directly or indirectly in respect thereof, and the guaranty herein made shall apply to the Guaranteed Obligations as so changed,
extended, renewed or altered; 

 (b) take and hold security for the payment of the Guaranteed Obligations and sell, exchange, release,
surrender, impair, realize upon or otherwise deal with in any manner and in any order any property by whomsoever at any time pledged or mortgaged to secure, or howsoever securing, the Guaranteed Obligations or any liabilities (including any of those
hereunder) incurred directly or indirectly in respect thereof or hereof, and/or any offset there against, and/or release any Person liable for all or any portion of the Guaranteed Obligations; 
 (c) act or fail to act in any manner referred to in this Guaranty which may deprive such Guarantor of its right to subrogation against the Borrowers to
recover full indemnity for any payments made pursuant to this Guaranty; and/or 
 (d) take any other action which would, under otherwise
applicable principles of common law, give rise to a legal or equitable discharge of such Guarantor from it liabilities under this Guaranty. 
 7. No invalidity, irregularity or unenforceability of all or any part of the Guaranteed Obligations or of any security therefor shall affect, impair or be a defense to this Guaranty, and this Guaranty shall be primary, absolute, irrevocable
and unconditional notwithstanding the occurrence of any event or the existence of any other circumstances which might constitute a legal or equitable discharge of a surety or guarantor except indefeasible payment in full of the Guaranteed
Obligations. 
 8. This Guaranty is a continuing one and all liabilities to which it applies or may apply under the terms hereof shall be
conclusively presumed to have been created in reliance hereon. No failure or delay on the part of any Creditor in exercising any right, power or privilege hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any
right, power or privilege hereunder preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein expressly specified are cumulative and not exclusive of any rights or remedies
which any Creditor would otherwise have. No notice to or demand on any Guarantor in any case shall entitle such Guarantor to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of any Creditor
to any other or further action in any circumstances without notice or demand. It is not necessary for any Creditor to inquire into the capacity or powers of the Borrowers or the officers, directors, partners or agents acting or purporting to act on
its behalf, and any indebtedness made or created in reliance upon the professed exercise of such powers shall be guaranteed hereunder. 
 9.
Any indebtedness of any Borrower now or hereafter held by any Guarantor is hereby subordinated to the indebtedness of such Borrower to the Creditors; and such indebtedness of such Borrower to any Guarantor, if the Administrative Agent, after an
Event of Default has occurred, so requests at a time when any Guaranteed Obligations are 

 
outstanding, shall be collected, enforced and received by such Guarantor as trustee for the Creditors and be paid over to the Creditors on account of the
indebtedness of such Borrower to the Creditors, but without affecting or impairing in any manner the liability of such Guarantor under the other provisions of this Guaranty. Prior to the transfer by any Guarantor of any note or negotiable instrument
evidencing any indebtedness of a Borrower to such Guarantor, such Guarantor shall mark such note or negotiable instrument with a legend that the same is subject to this subordination. Without limiting the generality of the foregoing, each Guarantor
hereby agrees with the Creditors that it will not exercise any right of subrogation which it may at any time otherwise have as a result of this Guaranty (whether contractual, under Section 509 of the Bankruptcy Code or otherwise) until all
Guaranteed Obligations have been paid in full in cash (it being understood that each Guarantor is not waiving any right of subrogation that it may otherwise have but is only waiving the exercise thereof as provided above). 
 10. (a) Each Guarantor waives any right (except as shall be required by applicable statute and cannot be waived) to require the Creditors to:
(i) proceed against the Borrowers, any other Guarantor, any other guarantor of the Guaranteed Obligations or any other party; (ii) proceed against or exhaust any security held from the Borrowers, any other Guarantor, any other guarantor of
the Guaranteed Obligations or any other party; or (iii) pursue any other remedy in the Creditors’ power whatsoever. Each Guarantor waives any defense based on or arising out of any defense of the Borrower, such Guarantor, any other
Guarantor, any other guarantor of the Guaranteed Obligations or any other party other than payment in full of the Guaranteed Obligations, including, without limitation, any defense based on or arising out of the disability of the Borrowers, such
Guarantor, any other Guarantor, any other guarantor of the Guaranteed Obligations or any other party, or the unenforceability of the Guaranteed Obligations or any part thereof from any cause, or the cessation from any cause of the liability of the
Borrowers other than payment in full of the Guaranteed Obligations. The Creditors may, at their election, foreclose on any security held by the Administrative Agent, the Collateral Agent or the other Creditors by one or more judicial or nonjudicial
sales or exercise any other right or remedy the Creditors may have against the Borrowers or any other party, or any security, without affecting or impairing in any way the liability of any Guarantor hereunder except to the extent the Guaranteed
Obligations have been paid in full. Each Guarantor waives any defense arising out of any such election by the Creditors, even though such election operates to impair or extinguish any right of reimbursement or subrogation or other right or remedy of
such Guarantor against the Borrowers or any other party or any security. 
 (b) Each Guarantor waives all presentments, demands for
performance, protests and notices, including, without limitation, notices of nonperformance, notices of protest, notices of dishonor, notices of acceptance of this Guaranty, and notices of the existence, creation or incurring of new or additional
indebtedness. Each Guarantor assumes all responsibility for being and keeping itself informed of each Borrower’s financial condition and assets, and of all other circumstances bearing upon the risk of nonpayment of the Guaranteed Obligations
and the nature, scope and extent of the risks which such Guarantor assumes and incurs hereunder, and agrees that the Creditors shall have no duty to advise any Guarantor of information known to any of them regarding such circumstances or risks.

 11. In order to induce the Lender Creditors to enter into the Credit Agreement and to make the Revolving Loans pursuant to the Credit
Agreement, and to induce the Other Creditors to enter into the Guaranteed Hedging Agreements, each Guarantor represents, warrants and covenants that: 
 (a) Status. Such Guarantor (i) is a duly organized and validly existing corporation, partnership, trust or limited liability company, as the case may be, in good standing (if applicable) under the laws of
the jurisdiction of its organization, (ii) has the corporate, partnership, trust or limited liability company power and authority, as the case may be, to own or lease its property and assets and to transact the business in which it is engaged
and presently proposes to engage and (iii) is duly qualified and is authorized to do business and is in good standing in each jurisdiction where the conduct of its business requires such qualification, except for failures to be so qualified
which, individually or in the aggregate, could not reasonably be expected to have a Material Adverse Effect. 

 (b) Power and Authority. Such Guarantor has the corporate, partnership, trust or limited liability
company power and authority, as the case may be, to execute, deliver and perform the terms and provisions of this Guaranty and each other Credit Document to which it is a party and has taken all necessary corporate, partnership, trust or limited
liability company action, as the case may be, to authorize the execution, delivery and performance by it of each such Credit Document. Such Guarantor has duly executed and delivered this Guaranty and each other Credit Document to which it is a party
and each such Credit Document constitutes the legal, valid and binding obligation of such Guarantor enforceable in accordance with its terms, except to the extent that the enforceability hereof and thereof may be limited by applicable bankruptcy,
insolvency, fraudulent conveyance, reorganization, moratorium or other similar laws affecting creditors’ rights generally and by equitable principles (regardless of whether enforcement is sought in equity or at law). 
 (c) No Violation. Neither the execution, delivery or performance by such Guarantor of this Guaranty or any other Credit Document to which it is a
party, nor compliance by it with the terms and provisions hereof and thereof (i) will contravene any applicable provision of any law, statute, rule or regulation, or any order, writ, injunction or decree of any court or governmental
instrumentality, (ii) will conflict or be inconsistent with or result in any breach of any of the terms, covenants, conditions or provisions of, or constitute a default under, or result in the creation or imposition of (or the obligation to
create or impose) any Lien (except pursuant to the Pledge and Security Agreement) upon any of the property or assets of such Guarantor or any of its Subsidiaries pursuant to the terms of, any indenture, mortgage, deed of trust, credit agreement or
loan agreement or any other material agreement, contract or instrument to which such Guarantor or any of its Subsidiaries is a party or by which it or any of its property or assets is bound or to which it may be subject except for violations and
defaults that may arise under contracts of such Guarantor otherwise permitted under the Credit Agreement as a result of the sale of, or foreclosure of a lien upon, the Securities (as defined in the Pledge and Security Agreement) of Subsidiaries
pledged under the Pledge and Security Agreement to the extent that the prior consent of other parties to such contracts have not been obtained or other actions specified in such contracts have not been taken in connection with any such sale or
foreclosure, or (iii) will violate any provision of the certificate of incorporation, certificate of partnership, partnership agreement, limited liability company agreement or by-laws of such Guarantor or any of its Subsidiaries. 

 (d) Governmental Approvals. No order, consent, approval, license, authorization or validation of,
or filing, recording or registration with (except as have been obtained or made), or exemption by, any governmental or public body or authority, or any subdivision thereof, is required to authorize, or is required in connection with, (i) the
execution, delivery and performance of this Guaranty or any other Credit Document to which such Guarantor is a party or (ii) the legality, validity, binding effect or enforceability of this Guaranty or any other Credit Document to which such
Guarantor is a party. 
 (e) Litigation. There are no actions, suits or proceedings pending or, to the best knowledge of such
Guarantor, threatened (i) which purport to affect the legality, validity or enforceability of this Guaranty or (ii) that could reasonably be expected to have a Material Adverse Effect. 
 12. Each Guarantor covenants and agrees that on and after the Effective Date and until the Total Revolving Loan Commitment has terminated and when no
Note remains outstanding and all Guaranteed Obligations have been paid in full, such Guarantor shall take, or will refrain from taking, as the case may be, all actions that are necessary to be taken or not taken so that no violation of any
provision, covenant or agreement contained in Section 10 or 11 of the Credit Agreement occurs, and so that no Default or Event of Default is caused by the actions of such Guarantor or any of its Subsidiaries. 
 13. The Guarantors hereby jointly and severally agree to pay all out-of-pocket costs and expenses of each Creditor in connection with the enforcement of
this Guaranty (including reasonable legal fees and expenses) and the out-of-pocket costs and expenses of the Administrative Agent in connection with any amendment, waiver or consent relating hereto (including reasonable legal fees and expenses).

 14. This Guaranty shall be binding upon each Guarantor and its successors and assigns and shall inure to the benefit of the Creditors and
their successors and assigns; provided, however, that, except as otherwise permitted under the Credit Agreement, no Guarantor may assign or transfer any of its rights or obligations hereunder without the prior written consent of the Required Lenders
(and any such attempted assignment or transfer without such consent shall be null and void). 
 15. Neither this Guaranty nor any provision
hereof may be changed, waived, discharged or terminated except with the written consent of each Guarantor directly affected thereby and with the written consent of (i) the Required Lenders, or, to the extent required by Section 14.11 of
the Credit Agreement, each of the Lenders under the Credit Agreement, as the case may be, so long as any Credit Agreement Obligations remain outstanding and (ii) in any situation not covered by preceding clause (i), to the extent expressly
required under any Guaranteed Hedging Agreement, the holders of a majority of the outstanding principal amount of the Other Obligations; provided, that any change, waiver, modification or variance affecting the rights and benefits of a single Class
(as defined below) of Creditors (and not all Creditors in a like or similar manner) shall require the written consent of the Requisite Creditors (as defined below) of such Class of Creditors (it being understood that the addition or release of any
Guarantor hereunder shall not constitute a change, waiver, discharge or termination affecting any Guarantor other than the Guarantor so added or released). For the purpose of this Guaranty, the 

 
term “Class” shall mean each class of Creditors, i.e., whether (x) the Lender Creditors as holders of the Credit Agreement Obligations or
(y) the Other Creditors as the holders of the Other Obligations. For the purpose of this Guaranty, the term “Requisite Creditors” of any Class shall mean (x) with respect to the Credit Agreement Obligations, the Required Lenders,
or, to the extent required by Section 14.11 of the Credit Agreement, each of the Lenders, and (y) with respect to the Other Obligations, the holders of at least a majority of all obligations outstanding from time to time under the
respective Guaranteed Hedging Agreements. 
 16. Each Guarantor acknowledges that an executed (or conformed) copy of each of the Credit
Documents has been made available to such Guarantor and such Guarantor is familiar with the contents thereof. 
 17. In addition to any
rights now or hereafter granted under applicable law (including, without limitation, Section 151 of the New York Debtor and Creditor Law) and not by way of limitation of any such rights, upon the occurrence and during the continuance of an
Event of Default (such term to mean and include any “Event of Default” as defined in the Credit Agreement or any payment default under any Guaranteed Hedging Agreement continuing after any applicable grace period), each Creditor is hereby
authorized at any time or from time to time, without notice to any Guarantor or to any other Person, any such notice being expressly waived, to set off and to appropriate and apply any and all deposits (general or special) and any other indebtedness
at any time held or owing by such Creditor to or for the credit or the account of such Guarantor, against and on account of the obligations and liabilities of such Guarantor to such Creditor under this Guaranty, irrespective of whether or not such
Creditor shall have made any demand hereunder and although said obligations, liabilities, deposits or claims, or any of them, shall be contingent or unmatured. 
 18. All notices, requests, demands or other communications pursuant hereto shall be deemed to have been duly given or made when delivered to the Person to which such notice, request, demand or other communication is
required or permitted to be given or made under this Guaranty, addressed to such party at (i) in the case of any Lender Creditor, as provided in the Credit Agreement, (ii) in the case of any Guarantor, at the address of the U.S. Borrower
specified in the Credit Agreement, and (iii) in the case of any Other Creditor, at such address as such Other Creditor shall have specified in writing to the Guarantors; or in any case at such other address as any of the Persons listed above
may hereafter notify the others in writing. 
 19. If claim is ever made upon any Creditor for repayment or recovery of any amount or amounts
received in payment or on account of any of the Guaranteed Obligations and any of the aforesaid payees repays all or part of said amount by reason of (i) any judgment, decree or order of any court or administrative body having jurisdiction over
such payee or any of its property or (ii) any settlement or compromise of any such claim effected by such payee with any such claimant (including a Borrower), then and in such event each Guarantor agrees that any such judgment, decree, order,
settlement or compromise shall be binding upon such Guarantor, notwithstanding any revocation hereof or other instrument evidencing any liability of a Borrower, and such Guarantor shall be and remain liable to the aforesaid payees hereunder for the
amount so repaid or recovered to the same extent as if such amount had never originally been received by any such payee. 

 20. (A) This Guaranty shall be binding upon the successors and assigns of each Guarantor (although no
Guarantor may assign its rights and obligations hereunder except in accordance with Section 14 hereof) and shall inure to the benefit of and be enforceable by the Administrative Agent and the other Creditors and their respective successors and
assigns. THIS GUARANTY AND THE RIGHTS AND OBLIGATIONS OF THE CREDITORS AND OF THE UNDERSIGNED HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK. Any legal action or proceeding with respect to
this Guaranty or any other Credit Document to which any Guarantor is a party may be brought in the courts of the State of New York or of the United States of America for the Southern District of New York, in each case which are located in the City
of New York, and, by execution and delivery of this Guaranty, each Guarantor hereby irrevocably accepts for itself and in respect of its property, generally and unconditionally, the jurisdiction of the aforesaid courts. Each Guarantor hereby further
irrevocably waives any claim that any such courts lack jurisdiction over such Guarantor, and agrees not to plead or claim in any legal action or proceeding with respect to this Guaranty or any other Credit Document to which such Guarantor is a party
brought in any of the aforesaid courts that any such court lacks jurisdiction over such Guarantor. Each Guarantor further irrevocably consents to the service of process out of any of the aforementioned courts in any such action or proceeding by the
mailing of copies thereof by registered or certified mail, postage prepaid, to each Guarantor at its address set forth opposite its signature below, such service to become effective 30 days after such mailing. Each Guarantor hereby irrevocably
waives any objection to such service of process and further irrevocably waives and agrees not to plead or claim in any action or proceeding commenced hereunder or under any other Credit Document to which such Guarantor is a party that service of
process was in any way invalid or ineffective. Nothing herein shall affect the right of any of the Creditors to serve process in any other manner permitted by law or to commence legal proceedings or otherwise proceed against each Guarantor in any
other jurisdiction. 
 (A) Each Guarantor hereby irrevocably waives any objection which it may now or hereafter have to the laying of venue
of any of the aforesaid actions or proceedings arising out of or in connection with this Guaranty or any other Credit Document to which such Guarantor is a party brought in the courts referred to in clause (a) above and hereby further
irrevocably waives and agrees not to plead or claim in any such court that such action or proceeding brought in any such court has been brought in an inconvenient forum. 
 (B) WAIVER OF TRIAL BY JURY. EACH GUARANTOR AND EACH CREDITOR (BY ITS ACCEPTANCE OF THE BENEFITS OF THIS GUARANTY) HEREBY IRREVOCABLY WAIVES ALL RIGHTS TO A TRIAL BY JURY IN ANY ACTION, PROCEEDING OR
COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS GUARANTY, THE OTHER CREDIT DOCUMENTS TO WHICH SUCH GUARANTOR IS A PARTY OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY. 
 21. In the event that all of the capital stock of one or more Guarantors is sold or otherwise disposed of or liquidated in compliance with the
requirements of the Credit Agreement (or such sale or other disposition has been approved in writing by the Required Lenders (or, to the extent required by the Credit Agreement, each of the Lenders)) and the proceeds of such sale, disposition or
liquidation are applied in accordance with (and to the extent 

 
required by) the provisions of the Credit Agreement, to the extent applicable, or in the circumstances set forth in Section 10.15(a)(2) of the Credit
Agreement with respect to a Guarantor or in circumstances where the Collateral is released pursuant to Section 14.20 of the Credit Agreement, in any such case such Guarantor shall be released from this Guaranty and this Guaranty shall, as to
each such Guarantor or Guarantors, terminate, and have no further force or effect (it being understood and agreed that the sale or other disposition of one or more Persons that own, directly or indirectly, all of the capital stock, partnership
interests or limited liability company interests of any Guarantor shall be deemed to be a sale of such Guarantor for the purposes of this Section 21) and the Administrative Agent, at the request and expense of the respective Guarantor, will
promptly execute and deliver to such Guarantor a proper instrument or instruments acknowledging such release. 
 22. Each Guarantor hereby
confirms that it is its intention that this Guaranty not constitute a fraudulent transfer or conveyance for purposes of any bankruptcy, insolvency or similar law, the Uniform Fraudulent Conveyance Act or any similar Federal, state or foreign law. To
effectuate the foregoing intention, if enforcement of the liability of any Guarantor under this Guaranty for the full amount of the Guaranteed Obligations would be an unlawful or voidable transfer under any applicable fraudulent conveyance or
fraudulent transfer law or any comparable law, then the liability of such Guarantor hereunder shall be reduced to the maximum amount for which such liability may then be enforced without giving rise to an unlawful or voidable transfer under any such
law. 
 23. To the extent that any Guarantor shall be required hereunder to pay a portion of the Guaranteed Obligations which shall exceed
the greater of (i) the amount of the economic benefit actually received by such Guarantor from the incurrence of the Revolving Loans under the Credit Agreement and the entering into of Guaranteed Hedging Agreements and (ii) the amount
which such Guarantor would otherwise have paid if such Guarantor had paid the aggregate amount of the Guaranteed Obligations (excluding the amount thereof repaid by the Borrower and the other Guarantors) in the same proportion as such
Guarantor’s net worth at the date enforcement hereunder is sought bears to the aggregate net worth of all the Guarantors at the date enforcement hereunder is sought (the “Contribution Percentage”), then such Guarantor shall
have a right of contribution against each other Guarantor who has made payments in respect of the Guaranteed Obligations to and including the date enforcement hereunder is sought in an aggregate amount less than such other Guarantor’s
Contribution Percentage of the aggregate payments made to and including the date enforcement hereunder is sought by all Guarantors in respect of the Guaranteed Obligations; provided, that no Guarantor may take any action to enforce such right until
the Guaranteed Obligations have been indefeasibly paid in full and the Total Revolving Loan Commitment has been terminated, it being expressly recognized and agreed by all parties hereto that any Guarantor’s right of contribution arising
pursuant to this Section 23 against any other Guarantor shall be expressly junior and subordinate to such other Guarantor’s obligations and liabilities in respect of the Guaranteed Obligations and any other obligations owing under this
Guaranty. All parties hereto recognize and agree that, except for any right of contribution arising pursuant to this Section 23, each Guarantor who makes any payment in respect of the Guaranteed Obligations shall have no right of contribution
or subrogation against any other Guarantor in respect of such payment. Each of the Guarantors recognizes and acknowledges that the rights to contribution arising hereunder shall constitute an asset in favor of the party entitled to such
contribution. In this connection, each Guarantor has 

 
the right to waive its contribution right against any Guarantor to the extent that after giving effect to such waiver such Guarantor would remain solvent, in
the determination of the Required Lenders. 
 24. This Guaranty may be executed in any number of counterparts and by the different parties
hereto on separate counterparts, each of which when so executed and delivered shall be an original, but all of which shall together constitute one and the same instrument. A set of counterparts executed by all the parties hereto shall be lodged with
the Guarantors and the Administrative Agent. 
 25. All payments made by any Guarantor hereunder will be made without setoff, counterclaim or
other defense. 
 26. It is understood and agreed that any Subsidiary of the U.S. Borrower that is required to execute a counterpart of this
Guaranty pursuant to the Credit Agreement shall automatically become a Guarantor hereunder by executing a counterpart hereof and delivering the same to the Administrative Agent or by executing and delivering a supplement hereto in the form of Annex
1 hereto. 
 27. Any provision of this Guaranty held to be invalid, illegal or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such invalidity, illegality or unenforceability without affecting the validity, legality and enforceability of the remaining provisions hereof; and the invalidity of a particular provision in a
particular jurisdiction shall not invalidate such provision in any other jurisdiction. 
 * * * 

 IN WITNESS WHEREOF, each Guarantor has caused this Guaranty to be executed and delivered as of the date first above
written. 
  

			
	THE GUARANTORS LISTED ON SCHEDULE 1 HERETO
		
		 	 /s/ Gregory J. Larson

	By:	 	Gregory J. Larson
	Title:	 	Vice President of each Guarantor

 [Signature Page To Subsidiaries Guaranty] 

			
	Accepted and Agreed to:
	
	 DEUTSCHE BANK AG NEW YORK BRANCH,
 as Collateral Agent and Pledgee

		
	By:	 	 /s/ George R. Reynolds

	Name:	 	George R. Reynolds
	Title:	 	Director
	
	 DEUTSCHE BANK AG NEW YORK BRANCH,
 as Collateral Agent and Pledgee

		
	By:	 	 /s/ James Rolison

	Name:	 	James Rolison
	Title:	 	Director

 [Signature Page To Subsidiaries Guaranty] 

 [Schedule 1 to SECOND AMENDED AND RESTATED Subsidiaries Guaranty] 
  

			
	GUARANTORS:
	
	AIRPORT HOTELS LLC
	
	AMELIATEL
		
	By:	 	 HMC AMELIA I LLC and HMC AMELIA II LLC,
 its General Partners

	
	BRE/SWISS, L.L.C.
	
	CALGARY CHARLOTTE HOLDINGS COMPANY
	
	CALGARY CHARLOTTE PARTNERSHIP
		
	By:	 	 HMC CHARLOTTE (CALGARY) COMPANY
 and HMC GRACE
(CALGARY) COMPANY,
 its General Partners

	
	CHESAPEAKE HOTEL LIMITED PARTNERSHIP
		
	By:	 	 HMC PLP LLC,
 its General Partner

	
	CINCINNATI PLAZA LLC
	
	CITY CENTER HOTEL LIMITED PARTNERSHIP
		
	By:	 	 HOST LA JOLLA LLC,
 its General
Partner

			
	DURBIN LLC
	
	EAST SIDE HOTEL ASSOCIATES, L.P.
		
	By:	 	 HMC EAST SIDE LLC,
 its General
Partner

	
	FERNWOOD HOTEL LLC
	
	HMC AMELIA I LLC
	
	HMC AMELIA II LLC
	
	HMC AP CANADA COMPANY
	
	HMC AP GP LLC
	
	HMC AP LP
		
	By:	 	 HMC AP GP LLC,
 its General
Partner

	
	HMC ATLANTA LLC
	
	HMC BCR HOLDINGS LLC
	
	HMC BURLINGAME LLC
	
	HMC CAMBRIDGE LLC

			
	
	 HMC CAPITAL LLC

	
	 HMC CAPITAL RESOURCES LLC

	
	 HMC CHARLOTTE (CALGARY) COMPANY

	
	 HMC CHARLOTTE GP LLC

	
	 HMC CHARLOTTE LP

		
	 By:
	 	 HMC CHARLOTTE GP LLC,
 its General Partner

	
	 HMC CHICAGO LLC

	
	 HMC CHICAGO LAKEFRONT LLC

	
	 HMC COPLEY LLC

	
	 HMC DESERT LLC

	
	 HMC DIVERSIFIED AMERICAN HOTELS, L.P.

		
	 By:
	 	 HMC DIVERSIFIED LLC,
 its General Partner

	
	 HMC DIVERSIFIED LLC

	
	
	HMC EAST SIDE LLC
	
	HMC EAST SIDE II LLC
	
	HMC GATEWAY LLC
	
	HMC GEORGIA LLC
	
	HMC GRACE (CALGARY) COMPANY
	
	HMC GRAND LLC
	
	HMC HANOVER LLC
	
	HMC HEADHOUSE FUNDING LLC
	
	HMC HOST RESTAURANTS LLC
	
	HMC HOTEL DEVELOPMENT LLC
	
	HMC HPP LLC
	
	HMC HT LLC
	
	HMC IHP HOLDINGS LLC

			
	
	HMC JWDC LLC
	
	HMC KEA LANI LLC
	
	HMC LENOX LLC
	
	HMC MANHATTAN BEACH LLC
	
	HMC MARKET STREET LLC
	
	HMC MAUI LLC
	
	HMC MEXPARK LLC
	
	HMC NGL LLC
	
	HMC O’HARE SUITES GROUND LLC
	
	HMC OLS I L.P.
		
	 By:
	 	 HMC OLS I LLC,
 its General Partner

	
	HMC OLS I LLC

			
	
	HMC OLS II L.P.
		
	 By:
	 	 HMC OLS I LLC,
 its General Partner

	
	HMC PACIFIC GATEWAY LLC
	
	HMC PARK RIDGE LLC
	
	HMC PLP LLC
	
	HMC POLANCO LLC
	
	HMC POTOMAC LLC
	
	HMC PROPERTIES I LLC
	
	HMC PROPERTIES II LLC
	
	HMC PROPERTY LEASING LLC
	
	HMC RESTON LLC
	
	HMC RETIREMENT PROPERTIES, L.P.
		
	 By:
	 	 DURBIN LLC,
 its General Partner

	
	HMC SBM TWO LLC

			
	
	HMC SEATTLE LLC
	
	HMC SFO LLC
	
	HMC SUITES LIMITED PARTNERSHIP
		
	 By:
	 	 HMC SUITES LLC,
 its General Partner

	
	HMC SUITES LLC
	
	HMC SWISS HOLDINGS LLC
	
	HMC TORONTO AIR COMPANY
	
	HMC TORONTO AIRPORT GP LLC
	
	HMC TORONTO AIRPORT LP
		
	 By:
	 	 HMC TORONTO AIRPORT GP LLC,
 its General Partner

	
	HMC TORONTO EC COMPANY
	
	HMC TORONTO EC GP LLC
	
	HMC TORONTO EC LP
		
	 By:
	 	 HMC TORONTO EC GP LLC,
 its General Partner

			
	
	HMC/INTERSTATE MANHATTAN BEACH, L.P.
		
	 By:
	 	 HMC MANHATTAN BEACH LLC,
 its General Partner

	
	HMH GENERAL PARTNER HOLDINGS LLC
	
	HMH MARINA LLC
	
	HMH PENTAGON LLC
	
	HMH RESTAURANTS LLC
	
	HMH RIVERS LLC
	
	HMH RIVERS, L.P.
		
	 By:
	 	 HMH RIVERS LLC,
 its General Partner

	
	HMH WTC LLC
	
	HOST ATLANTA PERIMETER GROUND LLC
	
	HOST CAPITOL HILL LLC
	
	HOST CINCINNATI II LLC

			
	
	HOST CINCINNATI HOTEL LLC
	
	HOST DALLAS QUORUM GROUND LLC
	
	HOST FINANCING LLC
	
	HOST FOURTH AVENUE LLC
	
	HOST HOUSTON BRIAR OAKS, L.P.
		
	 By:
	 	 HOST REALTY PARTNERSHIP, L.P.,
 (By: HST I LLC, its General Partner),
 its General Partner

	
	HOST INDIANAPOLIS I LLC
	
	HOST LA JOLLA LLC
	
	HOST LOS ANGELES LLC
	
	HOST MISSION HILLS, L.L.C.
	
	HOST MISSION HILLS II LLC
	
	HOST MISSION HILLS HOTEL LLC
	
	HOST NEEDHAM LLC

			
	
	HOST NEEDHAM II LLC
	
	HOST NEEDHAM HOTEL LLC
	
	HOST OF BOSTON, LTD.
		
	 By:
	 	 AIRPORT HOTELS LLC,
 its General Partner

	
	HOST OF HOUSTON 1979
		
	 By:
	 	 AIRPORT HOTELS LLC and HOST OF HOUSTON, LTD.,
 (By: AIRPORT HOTELS LLC, its General Partner),
 its General Partners

	
	HOST OF HOUSTON, LTD.
		
	 By:
	 	 AIRPORT HOTELS LLC,
 its General Partner

	
	HOST PARK RIDGE LLC
	
	HOST REALTY LLC
	
	HOST REALTY COMPANY LLC
	
	HOST REALTY HOTEL LLC
	
	HOST REALTY PARTNERSHIP, L.P.
		
	 By:
	 	 HST I LLC,
 its General Partner

			
	
	HOST TUCSON LLC
	
	HOST WALTHAM LLC
	
	HOST WALTHAM II LLC
	
	HOST WALTHAM HOTEL LLC
	
	HST LT LLC
	
	HST I LLC
	
	IHP HOLDINGS PARTNERSHIP, L.P.
		
	 By:
	 	 HMH GENERAL PARTNER HOLDINGS LLC,
 its General Partner

	
	IVY STREET LLC
	
	IVY STREET HOPEWELL LLC
	
	MARKET STREET HOST LLC
	
	NEW MARKET STREET LP
		
	 By:
	 	 HMC MARKET STREET LLC,
 its General Partner

			
	
	PHILADELPHIA AIRPORT HOTEL LLC
	
	PM FINANCIAL LLC
	
	PM FINANCIAL LP
		
	 By:
	 	 PM FINANCIAL LLC,
 its General Partner

	
	POTOMAC HOTEL LIMITED PARTNERSHIP
		
	 By:
	 	 HMC POTOMAC LLC,
 its General Partner

	
	PRM LLC
	
	ROCKLEDGE HOTEL LLC
	
	S.D. HOTELS LLC
	
	SANTA CLARA HMC LLC
	
	SOUTH COAST HOST HOTEL LLC
	
	STARLEX LLC
	
	TIMES SQUARE GP LLC
	
	TIMES SQUARE LLC

			
	WELLSFORD-PARK RIDGE HMC HOTEL LIMITED PARTNERSHIP
		
	 By:
	 	 HOST PARK RIDGE LLC,
 its General Partner

	
	YBG ASSOCIATES LLC

 The address for each of the Guarantors listed above is: 
 c/o Host Hotels & Resorts, L.P. 
 6903 Rockledge Drive 
 Suite 1500 
 Bethesda, Maryland 20817 

 ANNEX 1 TO SECOND AMENDED AND RESTATED 
 SUBSIDIARIES GUARANTY 
 FORM OF SUBSIDIARIES GUARANTY SUPPLEMENT

 SUPPLEMENT NO.      dated as of
[                    ] (this “Supplement”), to the Second Amended and Restated Subsidiaries Guaranty, dated as of
            ,          (the “Guaranty”), made by the Guarantors party thereto (immediately before giving effect to this
Supplement) and accepted by Deutsche Bank AG New York Branch as Collateral Agent and Pledgee (each capitalized term used but not defined having the meaning given it in the Guaranty) for the benefit of the Creditors. 
 A. Reference is made to the Second Amended and Restated Credit Agreement, dated as of May 25, 2007 (as amended or modified from time to time, the
“Credit Agreement”), among Host Hotels & Resorts, L.P. (the “U.S. Borrower”), the U.S. Subsidiary Borrower listed therein, each Canadian Revolving Loan Borrower from time to time party thereto, the lenders from time to
time party thereto (the “Lenders”), and Deutsche Bank AG New York Branch, as Administrative Agent. 
 B. The Guarantors have
entered into the Guaranty in order to induce the Lenders to make Revolving Loans and to issue, and participate in, Letters of Credit pursuant to, and upon the terms and subject to the conditions specified in, the Credit Agreement. Pursuant to
Section 10.15 of the Credit Agreement, certain Subsidiaries of the U.S. Borrower may, after the date of the Guaranty, be required to enter into the Guaranty as a Guarantor. Section 26 of the Guaranty provides that such additional
Subsidiaries may become Guarantors under the Guaranty by execution and delivery of an instrument in the form of this Supplement. The undersigned (the “New Subsidiary Guarantor”) is a Subsidiary of the U.S. Borrower and is executing this
Supplement in accordance with the requirements of the Credit Agreement to become a Guarantor under the Guaranty in order to induce the Lenders to make additional Revolving Loans and to issue, and participate in, additional Letters of Credit and as
consideration for Loans previously made and Letters of Credit previously issued. 
 Accordingly, the Collateral Agent and the New Subsidiary
Guarantor agree as follows: 
 SECTION 1. In accordance with Section 26 of the Guaranty, the New Subsidiary Guarantor by its signature
below becomes a Guarantor under the Guaranty with the same force and effect as if originally named therein as a Guarantor and the New Subsidiary Guarantor hereby agrees to all the terms and provisions of the Guaranty applicable to it as a Guarantor
thereunder. Each reference to a “Guarantor” in the Guaranty shall be deemed to include the New Subsidiary Guarantor. The Guaranty is hereby incorporated herein by reference. 
 SECTION 2. The New Subsidiary Guarantor represents and warrants to the Creditors that (i) this Supplement has been duly authorized, executed and
delivered by it and 

 
constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms, subject to the effects of applicable bankruptcy,
insolvency or similar laws effecting creditors’ rights generally and equitable principles of general applicability and (ii) the representations and warranties contained in Section 11 of the Guaranty are true and correct as of the date
hereof as to the New Subsidiary Guarantor. 
 SECTION 3. This Supplement may be executed in two or more counterparts, each of which shall
constitute an original, but all of which, when taken together, shall constitute but one instrument. This Supplement shall become effective when the Administrative Agent shall have received counterparts of this Supplement that, when taken together,
bear the signatures of the New Subsidiary Guarantor and the Administrative Agent. 
 SECTION 4. Except as expressly supplemented hereby, the
Guaranty shall remain in full force and effect. 
 SECTION 5. THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
LAWS OF THE STATE OF NEW YORK. 
 SECTION 6. In case any one or more of the provisions contained in this Supplement should be held
invalid, illegal or unenforceable in any respect, neither party hereto shall be required to comply with such provision for so long as such provision is held to be invalid, illegal or unenforceable, but the validity, legality and enforceability of
the remaining provisions contained herein and in the Guaranty shall not in any way be affected or impaired. The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid
provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions. 
 SECTION 7.
All communications and notices hereunder shall be in writing and given as provided in the Credit Agreement. All communications and notices hereunder to the New Subsidiary Guarantor shall be given to it at the address set forth under its signature,
with a copy to the U.S. Borrower. 

 IN WITNESS WHEREOF, the New Subsidiary Guarantor and the Collateral Agent have duly executed this
Supplement to the Guaranty as of the day and year first above written. 
 Address: 
  

			
	 [NAME OF NEW GUARANTOR],

	         as Subsidiary Guarantor

		
	 By
	 	  

	 Name:
	 	
	 Title:
	 	
	 Address:
	 	  

		 	  
  

	
	 DEUTSCHE BANK AG NEW YORK BRANCH,
         as Collateral Agent

		
	 By
	 	  

	 Name:
	 	
	 Title:Amended and Restated 2000 Stock Option and Incentive Plan

 Exhibit 10.1 
 AVICI SYSTEMS INC. 
 AMENDED AND RESTATED 2000 STOCK OPTION AND INCENTIVE PLAN 
  

	1.	Purpose and Eligibility 

 The purpose of this
Amended and Restated 2000 Stock Option and Incentive Plan (the “Plan”) of Avici Systems Inc. (the “Company”) is to provide stock options and other equity interests in the Company (each an “Award”)
to employees, officers, directors, consultants and advisors of the Company and its Subsidiaries, all of whom are eligible to receive Awards under the Plan. Any person to whom an Award has been granted under the Plan is called a
“Participant”. Additional definitions are contained in Section 8. 
  

	2.	Administration 

 a. Administration by Board of
Directors. The Plan will be administered by the Board of Directors of the Company (the “Board”). The Board, in its sole discretion, shall have the authority to grant and amend Awards, to adopt, amend and repeal rules relating to
the Plan and to interpret and correct the provisions of the Plan and any Award. All decisions by the Board shall be final and binding on all interested persons. Neither the Company nor any member of the Board shall be liable for any action or
determination relating to the Plan. 
 b. Appointment of Committees. To the extent permitted by applicable law, the Board may delegate
any or all of its powers under the Plan to one or more committees or subcommittees of the Board (a “Committee”). All references in the Plan to the “Board” shall mean such Committee or the Board. 
 c. Delegation to Executive Officers. To the extent permitted by applicable law, the Board may delegate to one or more executive officers of the
Company the power to grant Awards and exercise such other powers under the Plan as the Board may determine, provided that the Board shall fix the maximum number of Awards to be granted and the maximum number of shares issuable to any one
Participant pursuant to Awards granted by such executive officers. 
  

	3.	Stock Available for Awards 

 a. Number of
Shares. Subject to adjustment under Section 3(c), the aggregate number of shares of Common Stock of the Company (the “Common Stock”) that may be issued pursuant to the Plan is equal to the number of shares of Common Stock
authorized but not issued under the 1997 Stock Incentive Plan of the Company, as amended, on or before the date of the initial public offering of the Company’s Common Stock plus (i) the 1,250,000 additional shares authorized for issuance
under the Plan pursuant to the amendment of the Plan in 2001 and (ii) the 1,250,000 additional shares authorized for 

 
issuance under the Plan pursuant to the amendment of the Plan in 2004 (collectively the “Available Shares”). If any Award expires, or is
terminated, surrendered or forfeited, in whole or in part, the unissued Common Stock covered by such Award shall again be available for the grant of Awards under the Plan. If shares of Common Stock issued pursuant to the Plan are repurchased by, or
are surrendered or forfeited to, the Company at no more than cost, such shares of Common Stock shall again be available for the grant of Awards under the Plan; provided, however, that the cumulative number of such shares that may be so reissued
under the Plan will not exceed the Available Shares. Shares issued under the Plan may consist in whole or in part of authorized but unissued shares or treasury shares. 
 b. Per-Participant Limit. Subject to adjustment under Section 3(c), no Participant may be granted Awards during any one fiscal year to purchase more than 500,000 shares of Common Stock. 
 c. Adjustment to Common Stock. In the event of any stock split, stock dividend, extraordinary cash dividend, recapitalization, reorganization,
merger, consolidation, combination, exchange of shares, liquidation, spin-off, split-up, or other similar change in capitalization or event (i) the number and class of securities available for Awards under the Plan and the per-Participant share
limit, (ii) the number and class of securities, vesting schedule and exercise price per share subject to each outstanding Option, (iii) the repurchase price per security subject to repurchase, and (iv) the terms of each other
outstanding stock-based Award shall be adjusted by the Board (or substituted Awards may be made), in order in the case of each outstanding Award to preserve the economic value of the Award. If Section 7(e)(i) applies for any event, this
Section 3(c) shall not be applicable. Adjustments under this Section 3(c) shall be mandatory and shall be final, binding and conclusive. 
  

	4.	Stock Options 

 a. General. The Board may
grant options to purchase Common Stock (each, an “Option”) and determine the number of shares of Common Stock to be covered by each Option, the exercise price of each Option and the conditions and limitations applicable to the
exercise of each Option and the Common Stock issued upon the exercise of each Option, including vesting provisions, repurchase provisions and restrictions relating to applicable federal or state securities laws, as it considers advisable.

 b. Incentive Stock Options. An Option that the Board intends to be an “incentive stock option” as defined in
Section 422 of the Code (an “Incentive Stock Option”) shall be granted only to employees of the Company and shall be subject to and shall be construed consistently with the requirements of Section 422 of the Code. The
Board and the Company shall have no liability if an Option or any part thereof that is intended to be an Incentive Stock Option does not qualify as such. An Option or any part thereof that does not qualify as an Incentive Stock Option is referred to
herein as a “Nonstatutory Stock Option.” 

 c. Exercise Price. The Board shall establish the exercise price (or determine the method by which
the exercise price shall be determined) at the time each Option is granted and specify it in the applicable option agreement. 
 d.
Duration of Options. Each Option shall be exercisable at such times and subject to such terms and conditions as the Board may specify in the applicable option agreement. Following April 18, 2007, no Option will be granted for a term in
excess of ten (10) years from the date of grant of the Option. 
 e. Exercise of Option. Options may be exercised only by
delivery to the Company of a written notice of exercise signed by the proper person together with payment in full as specified in Section 4(f) for the number of shares for which the Option is exercised. 
 f. Payment Upon Exercise. Common Stock purchased upon the exercise of an Option shall be paid for by one or any combination of the following forms
of payment: 
 (i) by check payable to the order of the Company; 
 (ii) except as otherwise explicitly provided in the applicable option agreement, and only if the Common Stock is then publicly traded,
delivery of an irrevocable and unconditional undertaking by a creditworthy broker to deliver promptly to the Company sufficient funds to pay the exercise price, or delivery by the Participant to the Company of a copy of irrevocable and unconditional
instructions to a creditworthy broker to deliver promptly to the Company cash or a check sufficient to pay the exercise price; or 
 (iii) to the extent explicitly provided in the applicable option agreement, by (x) delivery of shares of Common Stock owned by the Participant valued at fair market value (as determined by the Board or as determined pursuant to the
applicable option agreement), (y) delivery of a promissory note of the Participant to the Company (and delivery to the Company by the Participant of a check in an amount equal to the par value of the shares purchased), or (z) payment of
such other lawful consideration as the Board may determine. 
  

	5.	Restricted Stock 

 a. Grants. The Board may
grant Awards entitling recipients to acquire shares of Common Stock, subject to (i) delivery to the Company by the Participant of a check or payment of such other lawful consideration as the Board may determine in an amount at least equal to
the par value of the shares purchased, and (ii) the right of the Company to repurchase all or part of such shares at their issue price or other stated or formula price from the Participant in the event that conditions specified by the Board in
the applicable Award are not satisfied prior to the end of the applicable restriction period or periods established by the Board for such Award (each, a “Restricted Stock Award”). 

 b. Terms and Conditions. The Board shall determine the terms and conditions of any such Restricted
Stock Award. Any stock certificates issued in respect of a Restricted Stock Award shall be registered in the name of the Participant and, unless otherwise determined by the Board, deposited by the Participant, together with a stock power endorsed in
blank, with the Company (or its designee). After the expiration of the applicable restriction periods, the Company (or such designee) shall deliver the certificates no longer subject to such restrictions to the Participant or, if the Participant has
died, to the beneficiary designated by a Participant, in a manner determined by the Board, to receive amounts due or exercise rights of the Participant in the event of the Participant’s death (the “Designated Beneficiary”). In
the absence of an effective designation by a Participant, Designated Beneficiary shall mean the Participant’s estate. Each Restricted Stock Award granted pursuant to the Plan shall be subject to forfeiture if, in the discretion of the Board,
the recipient of such award has not, within a reasonable period of time following the grant of such award, executed any instrument required by the Board to be executed in connection with such award. 
  

	6.	Other Stock-Based Awards 

 The Board shall have the
right to grant other Awards based upon the Common Stock having such terms and conditions as the Board may determine, including, without limitation, the grant of shares based upon certain conditions, the grant of securities convertible into Common
Stock and the grant of stock appreciation rights, phantom stock awards or stock units. 
  

	7.	General Provisions Applicable to Awards 

 a.
Transferability of Awards. Except as the Board may otherwise determine or provide in an Award, Awards shall not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily or by
operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, shall be exercisable only by the Participant. References to a Participant, to the extent relevant in the context, shall include
references to authorized transferees. 
 b. Documentation. Each Award under the Plan shall be evidenced by a written instrument in
such form as the Board shall determine or as executed by an officer of the Company pursuant to authority delegated by the Board. Each Award may contain terms and conditions in addition to those set forth in the Plan provided that such terms
and conditions do not contravene the provisions of the Plan. 
 c. Board Discretion. The terms of each type of Award need not be
identical, and the Board need not treat Participants uniformly. 
 d. Termination of Status. The Board shall determine the effect on
an Award of the disability, death, retirement, authorized leave of absence or other change in the employment or other status of a Participant and the extent to which, and the period during 

 
which, the Participant, or the Participant’s legal representative, conservator, guardian or Designated Beneficiary, may exercise rights under the Award.

 e. Acquisition of the Company 
 (i) Consequences of an Acquisition. 
 (A) Upon the consummation of an Acquisition, the Board shall
take any one or more of the following actions with respect to then outstanding Awards: (a) provide that outstanding Options shall be assumed, or equivalent Options shall be substituted, by the acquiring or succeeding corporation (or an
affiliate thereof), provided that any such Options substituted for Incentive Stock Options shall satisfy, in the determination of the Board, the requirements of Section 424(a) of the Code; (b) upon written notice to the Participants,
provide that all or a portion of then unexercised Options will become exercisable in full or in part as of a specified time (the “Acceleration Time”) prior to the Acquisition and will terminate immediately prior to the consummation
of such Acquisition, except to the extent exercised by the Participants between the Acceleration Time and the consummation of such Acquisition; (c) in the event of an Acquisition under the terms of which holders of Common Stock will receive
upon consummation thereof a cash payment for each share of Common Stock surrendered pursuant to such Acquisition (the “Acquisition Price”), provide that all outstanding Options shall terminate upon consummation of such Acquisition
and each Participant shall receive, in exchange therefor, a cash payment equal to the amount (if any) by which (x) the Acquisition Price multiplied by the number of shares of Common Stock subject to such outstanding Options (whether or not then
exercisable), exceeds (y) the aggregate exercise price of such Options; (d) provide that all or any portion of the Restricted Stock Awards then outstanding shall become free of all or certain restrictions prior to the consummation of the
Acquisition; and (e) provide that any other stock-based Awards outstanding (x) shall become exercisable, realizable or vested in full or in part, or shall be free of all or certain conditions or restrictions, as applicable to each such
Award, prior to the consummation of the Acquisition, or (y), if applicable, shall be assumed, or equivalent Awards shall be substituted, by the acquiring or succeeding corporation (or an affiliate thereof). 
 (B) Acquisition Defined. An “Acquisition” shall mean: (x) the sale of the Company by merger in which the shareholders of the
Company in their capacity as such no longer own a majority of the outstanding equity securities of the Company (or its successor); or (y) any sale of all or substantially all of the assets or capital stock of the Company (other than in a
spin-off or similar transaction) or (z) any other acquisition of the business of the Company, as determined by the Board. 
 (ii)
Assumption of Options Upon Certain Events. In connection with a merger or consolidation of an entity with the Company or the acquisition by the Company of property or stock of an entity, the Board may grant Awards under the Plan in
substitution for stock and stock-based awards issued by such entity or an affiliate thereof. 

 
The substitute Awards shall be granted on such terms and conditions as the Board considers appropriate in the circumstances. 
 (iii) Pooling-of Interests-Accounting. If the Company proposes to engage in an Acquisition intended to be accounted for as a pooling-of-interests,
and in the event that the provisions of this Plan or of any Award hereunder, or any actions of the Board taken in connection with such Acquisition, are determined by the Company’s or the acquiring company’s independent public accountants
to cause such Acquisition to fail to be accounted for as a pooling-of-interests, then such provisions or actions shall be amended or rescinded by the Board, without the consent of any Participant, to be consistent with pooling-of-interests
accounting treatment for such Acquisition. 
 (iv) Parachute Awards. Notwithstanding the provisions of Section 7(e)(i)(A), if, in
connection with an Acquisition described therein, a tax under Section 4999 of the Code would be imposed on the Participant (after taking into account the exceptions set forth in Sections 280G(b)(4) and 280G(b)(5) of the Code), then the number
of Awards which shall become exercisable, realizable or vested as provided in such section shall be reduced (or delayed), to the minimum extent necessary, so that no such tax would be imposed on the Participant (the Awards not becoming so
accelerated, realizable or vested, the “Parachute Awards”); provided, however, that if the “aggregate present value” of the Parachute Awards would exceed the tax that, but for this sentence, would be imposed on the
Participant under Section 4999 of the Code in connection with the Acquisition, then the Awards shall become immediately exercisable, realizable and vested without regard to the provisions of this sentence. For purposes of the preceding
sentence, the “aggregate present value” of an Award shall be calculated on an after-tax basis (other than taxes imposed by Section 4999 of the Code) and shall be based on economic principles rather than the principles set forth under
Section 280G of the Code and the regulations promulgated thereunder. All determinations required to be made under this Section 7(e)(iv) shall be made by the Company. 
 f. Withholding. Each Participant shall pay to the Company, or make provisions satisfactory to the Company for payment of, any taxes required by
law to be withheld in connection with Awards to such Participant no later than the date of the event creating the tax liability. The Board may allow Participants to satisfy such tax obligations in whole or in part by transferring shares of Common
Stock, including shares retained from the Award creating the tax obligation, valued at their fair market value (as determined by the Board or as determined pursuant to the applicable option agreement). The Company may, to the extent permitted by
law, deduct any such tax obligations from any payment of any kind otherwise due to a Participant. 
 g. Amendment of Awards. The Board
may amend, modify or terminate any outstanding Award including, but not limited to, substituting therefor another Award of the same or a different type, changing the date of exercise or realization, and converting an Incentive Stock Option to a
Nonstatutory Stock Option, provided that, except as otherwise provided in Section 7(e)(iii), the Participant’s consent to such action shall be required unless the Board determines that the action, taking into account any related

 
action, would not materially and adversely affect the Participant, provided further that, no Award may be repriced by cancellation or amendment of
such Award without approval of the shareholders of the Company (except pursuant to Section 3(c) or 7(e)) if the effect would be to reduce the exercise price for the shares underlying such Award. 
 h. Conditions on Delivery of Stock. The Company will not be obligated to deliver any shares of Common Stock pursuant to the Plan or to remove
restrictions from shares previously delivered under the Plan until (i) all conditions of the Award have been met or removed to the satisfaction of the Company, (ii) in the opinion of the Company’s counsel, all other legal matters in
connection with the issuance and delivery of such shares have been satisfied, including any applicable securities laws and any applicable stock exchange or stock market rules and regulations, and (iii) the Participant has executed and delivered
to the Company such representations or agreements as the Company may consider appropriate to satisfy the requirements of any applicable laws, rules or regulations. 
 i. Acceleration. The Board may at any time provide that any Options shall become immediately exercisable in full or in part, that any Restricted Stock Awards shall be free of some or all restrictions, or that
any other stock-based Awards may become exercisable in full or in part or free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be, despite the fact that the foregoing actions may (i) cause
the application of Sections 280G and 4999 of the Code if a change in control of the Company occurs, or (ii) disqualify all or part of the Option as an Incentive Stock Option. 
  

	8.	Miscellaneous 

 a. Definitions. 

(i) “Company,” for purposes of eligibility under the Plan, shall include any present or future subsidiary corporations of Avici
Systems Inc., as defined in Section 424(f) of the Code (a “Subsidiary”), and any present or future parent corporation of Avici Systems Inc., as defined in Section 424(e) of the Code. For purposes of Awards other than
Incentive Stock Options, the term “Company” shall include any other business venture in which the Company has a direct or indirect significant interest, as determined by the Board in its sole discretion. 
 (ii) “Code” means the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder. 
 (iii) “employee” for purposes of eligibility under the Plan (but not for purposes of Section 4(b)) shall include a person to whom
an offer of employment has been extended by the Company. 
 b. No Right To Employment or Other Status. No person shall have any claim
or right to be granted an Award, and the grant of an Award shall not be construed 

 
as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to
dismiss or otherwise terminate its relationship with a Participant free from any liability or claim under the Plan. 
 c. No Rights As
Stockholder. Subject to the provisions of the applicable Award, no Participant or Designated Beneficiary shall have any rights as a stockholder with respect to any shares of Common Stock to be distributed with respect to an Award until becoming
the record holder thereof. 
 d. Effective Date and Term of Plan. The Plan shall become effective on the date on which it is adopted
by the Board. No Awards shall be granted under the Plan after the completion of ten years from the date on which the Plan was adopted by the Board, but Awards previously granted may extend beyond that date. 
 e. Amendment of Plan. The Board may amend, suspend or terminate the Plan or any portion thereof at any time. 
 f. Governing Law. The provisions of the Plan and all Awards made hereunder shall be governed by and interpreted in accordance with the laws of
Delaware, without regard to any applicable conflicts of law. 
 Amendment and Restatement Adopted by 
 Board of Directors 
 April 18, 2007 
 Amendment and Restatement Adopted by 
 Stockholders 
 May 31, 2007

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