Document:

Exhibit 10.2

GUARANTY OF PAYMENT

GUARANTY OF
PAYMENT (this “Guaranty”), made as of February 28, 2007, between
EQUITY RESIDENTIAL, a Maryland real estate investment trust, having an ad­dress
at Two North River­side Plaza, Suite 400, Chicago, Illinois 60606 (“Guarantor”),
and BANK OF AMERICA, N.A., having an office at 231 South LaSalle Street,
Chicago, Illinois 60697, as administrative agent (“Admin­istrative Agent”)
for the banks (the “Banks”) party to the Re­volving Credit Agree­ment
(as the same may be amend­ed, modi­fied, supple­mented or re­stated, the “Credit
Agr­ee­ment”), dated as of the date here­of, among ERP OPERATING LIMITED
PARTNERSHIP­ (“Bor­row­er”), the Banks, Administrative Agent, JPMORGAN
CHASE BANK, N.A., as Syndication Agent, SUNTRUST BANK, as Documenta­tion Agent,
WACHOVIA BANK, NATIONAL ASSOCIATION, as Documentation Agent, WELLS FARGO BANK,
N.A., as Documentation Agent, LASALLE BANK NATIONAL ASSOCIATION, as
Documentation Agent, THE ROYAL BANK OF SCOTLAND plc, as Documentation Agent,
and U.S. BANK NATIONAL ASSOCI­ATION, as Documentation Agent.

W  I
T  N  E  S  S  E  T  H:

WHEREAS, the Banks
have agreed to make loans (hereinafter collectively referred to as the “Loans”)
and otherwise extend credit to Borrower in an aggregate principal amount the
Dollar Equivalent Amount of which is not to exceed $1,500,000,000 (which amount
may be increased to an amount not to exceed $2,000,000,000);

WHEREAS, the Loans
will be evidenced by certain promissory notes (the “Notes”) of Borrower
made to each of the Banks in accordance with the terms of the Credit Agreement;

WHEREAS, the
Credit Agreement and the Notes and any other documents executed in connection
therewith are hereinafter collectively referred to as the “Loan Documents”;

WHEREAS,
capitalized terms used herein and not otherwise defined shall have the meanings
ascribed thereto in the Credit Agreement;

WHEREAS, Guarantor
is the sole general partner of Borrower; and

WHEREAS, in order
further to induce the Administrative Agent and the Banks to enter into the Loan
Documents, Guarantor has agreed to enter into this Guaranty;

NOW, THEREFORE, in
consideration of the premises and the benefits to be derived from the making of
the Loans and the other extensions of credit under the Credit Agreement by the
Banks to Borrower, and in order to induce the Administrative Agent and the
Banks to enter into the Loan Documents, Guaran­tor hereby agrees as follows:

1.  Guarantor, on behalf of itself and its suc­ces­sors
and assigns, hereby irrevocably, absolutely and uncondi­tionally guaran­tees
the full and punctual payment when due, whether at stated maturity or other­wise,
of all Obligations of Borrower now or hereaf­ter existing under the Notes and
the Credit Agreement, for principal and/or inter­est as well as any and all
other amounts due there­under, including, without limitation, all indemnity
obligations of Borrower thereunder, and any and all rea­son­able costs and ex­penses
(including, without limi­ta­tion, rea­sonable attorneys’ fees and dis­bursements)
incurred by the Administrative Agent or the Banks in en­forc­ing its or their
rights under this Guaranty (all of the foregoing obliga­tions being the “Guar­an­teed
Obli­gations”).

2.  It is agreed that the Guaranteed Obliga­tions
are primary and this Guaran­ty shall be enforce­able against Guarantor and its
succes­sors and assigns without the necessity for any suit or pro­ceeding of
any kind or nature whatsoever brought by the Administrative Agent or any Bank
against Borrower or its respective succes­sors or assigns or any other party or
against any securi­ty for the pay­ment and perfor­mance of the Guaranteed
Obligations and without the necessity of any notice of non-payment or
non-observance or of any notice of accep­tance of this Guaranty or of any
notice or demand to which Guarantor might otherwise be entitled (including,
without limita­tion, diligence, presentment, notice of maturity, exten­sion of
time, change in nature or form of the Guaran­teed Obligations, acceptance of
further securi­ty, release of further secu­rity, imposition or agreement
arrived at as to the amount of or the terms of the Guar­anteed Obliga­tions,
notice of adverse change in Borrower’s financial condition and any other fact
which might materially increase the risk to Guaran­tor), all of which Guarantor
hereby expressly waives; and Guarantor hereby expressly agrees that the
validity of this Guaran­ty and the obliga­tions of Guarantor hereun­der shall
in no way be terminat­ed, affected, diminished, modified or impaired by reason 

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of the asser­tion of or
the failure to assert by the Administrative Agent or any Bank against Borrower
or its re­spec­tive successors or assigns, any of the rights or remedies
reserved to the Administrative Agent and the Banks pursuant to the provisions
of the Loan Docu­ments.  Guar­antor
agrees that any notice or directive given at any time to the Administrative
Agent which is incon­sis­tent with the waiver in the immediately preceding sen­tence
shall be void and may be ignored by the Administrative Agent and the Banks,
and, in addition, may not be pleaded or introduced as evidence in any litiga­tion
relating to this Guaranty for the reason that such pleading or introduction
would be at variance with the written terms of this Guaranty, unless the
Administrative Agent and the Banks have specif­ically agreed otherwise in a
writ­ing, signed by a duly authorized officer. 
Guarantor specifi­cally ac­knowl­edges and agrees that the foregoing
waivers are of the essence of this transac­tion and that, but for this Guar­anty
and such waivers, the Administrative Agent and the Banks would decline to exe­cute
the Loan Documents.

3.  Guarantor waives, and covenants and agrees
that it will not at any time insist upon, plead or in any manner whatsoever
claim or take the benefit or advantage of, any and all appraisal, valuation,
stay, extension, marshalling-of-assets or redemption laws, or right of
homestead or exemption, whether now or at any time here­after in force, which
may delay, prevent or otherwise affect the performance by Guarantor of its obligations
under, or the enforcement by the Administrative Agent of, this Guar­an­ty. Guar­an­tor
further covenants and agrees not to set up or claim any defense, counterclaim,
offset, set-off or other objection of any kind to any action, suit or pro­ceeding
at law, in equity or otherwise, or to any demand or claim that may be institut­ed
or made by the Administrative Agent other than the de­fense of the actual
timely payment and perfor­mance by Borrower of the Guaranteed Obligations;
provided, however, that the foregoing shall not be deemed a waiver of Guarantor’s
right to assert any compulsory counterclaim, if such counterclaim is com­pelled
under local law or rule of procedure, nor shall the foregoing be deemed a
waiver of Guarantor’s right to assert any claim which would constitute a
defense, setoff, counterclaim or crossclaim of any nature whatso­ever against
Administrative Agent or any Bank in any separate action or proceeding.  Guar­antor repre­sents, war­rants and agrees
that, as of the date hereof, its obliga­tions under this Guaran­ty are not
subject to any counter­claims, offsets or defenses against the Administrative
Agent or any Bank of any kind.

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4.  The provisions of this Guaranty are for the
benefit of the Adminis­trative Agent and the Banks and their suc­ces­sors and
per­mit­ted as­signs, and noth­ing herein con­tained shall impair as between
Borrower and the Administrative Agent and the Banks the obliga­tions of Bor­row­er
under the Loan Docu­ments.

5.  This Guaranty shall be a continuing, irrevocable,
uncon­ditional and absolute guaranty and the liability of Guarantor hereunder
shall in no way be terminated, af­fected, modified, impaired or diminished by
reason of the happening, from time to time, of any of the following, although
without notice or the further consent of Guaran­tor:

(a)           any
assignment, amendment, modification or waiver of or change in any of the terms,
covenants, conditions or provi­sions of any of the Guaranteed Obligations or
the Loan Docu­ments or the invalidity or unenforceability of any of the
foregoing; or

(b)           any
extension of time that may be granted by the Administra­tive Agent or any Bank
to Borrower, any guarantor, or their re­spec­tive successors or assigns, heirs,
executors, admin­istra­tors or personal representa­tives; or

(c)           any
action which the Administrative Agent or any Bank may take or fail to take
under or in respect of any of the Loan Docu­ments or by reason of any waiver
or, or failure to enforce any of the rights, remedies, powers or privileges
available to the Administrative Agent and the Banks under this Guaran­ty or
available to the Administrative Agent and the Banks at law, in equity or other­wise,
or any action on the part of the Administrative Agent or any Bank granting
indul­gence or exten­sion in any form what­so­ever; or

(d)           any
sale, exchange, release, or other dispo­sition of any prop­erty pledged,
mortgaged or con­veyed, or any property in which the Adminis­trative Agent
and/or the Banks have been granted a lien or securi­ty inter­est to secure any
indebt­edness of Borrower to the Administrative Agent and/or the Banks or any
impairment of or failure to perfect any security interests therein; or

(e)           any
release of any person or entity who may be liable in any manner for the payment
and collection of any amounts owed by Borrower to the Administrative Agent
and/or the Banks; or

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(f)            the
application of any sums by whomsoever paid or however realized to any amounts
owing by Borrower to the Administrative Agent and/or the Banks under the Loan
Docu­ments in such manner as the Adminis­trative Agent shall deter­mine in its
sole discre­tion; or

(g)           Borrower’s
or any guarantor’s voluntary or involuntary liquida­tion, dissolution, sale of
all or substantially all of their respective assets and liabili­ties, appointment
of a trust­ee, receiver, liquidator, sequestrator or conservator for all or any
part of Borrower’s or any guarantor’s assets, insol­vency, bank­ruptcy,
assignment for the benefit of creditors, reorganization, arrangement,
composition or readjustment, or the com­mencement of other simi­lar proceedings
affecting Borrower or any guarantor or any of the assets of any of them,
including, without limitation, (i) the release or dis­charge of Borrower or any
guarantor from the payment and per­for­mance of their respective obligations
under any of the Loan Docu­ments by operation of law, or (ii) the impair­ment,
limi­tation or modification of the lia­bility of Borrower or any guarantor in
bankrupt­cy, or of any remedy for the enforcement of the Guaran­teed Obliga­tions
under any of the Loan Docu­ments, or Guarantor’s liability under this Guaranty,
resulting from the operation of any present or future provi­sions of the
Bankruptcy Code or other pres­ent or future federal, state or applicable
statute or law or from the decision in any court; or

(h)           any
improper disposition by Borrower of the proceeds of the Loans, it being
acknowledged by Guarantor that the Administrative Agent or any Bank shall be
enti­tled to honor any re­quest made by Borrower for a dis­burse­ment of such
proceeds and that neither the Administrative Agent nor any Bank shall have any
obli­ga­tion to see to the proper dispo­sition by Bor­rower of such proceeds.

6.  Guarantor agrees that if at any time all or
any part of any payment at any time received by the Administrative Agent or any
Bank from Borrower or Guarantor or any other Person obligated in respect of the
Guaranteed Obligations under or with re­spect to this Guaranty is or must be
rescinded or re­turned by the Administrative Agent or any Bank for any reason
what­so­ev­er (in­clud­ing, with­out limi­ta­tion, the insolven­cy, bank­rupt­cy
or reorga­nization of Borrower or Guaran­tor or such other Person), then 

 5
 

Guarantor’s obligations
hereunder shall, to the extent of the payment re­scinded or returned, be deemed
to have continued in existence notwith­standing such previous receipt by such
party, and Guarantor’s obli­ga­tions here­under shall con­tinue to be effective
or be rein­stat­ed, as the case may be, as to such payment, as though such
previous payment had never been made.

7.             Until this Guaranty is terminated
pursuant to the terms hereof, Guarantor (i) shall have no right of subrogation
against Borrower or any entity comprising same by reason of any payments or
acts of performance by Guarantor in compliance with the obligations of
Guarantor hereunder; (ii) waives any right to enforce any remedy which
Guarantor now or hereafter shall have against Bor­row­er or any entity
comprising same by reason of any one or more payment or acts of perfor­mance in
compliance with the obligations of Guarantor hereunder and (iii) from and after
an Event of Default, subor­dinates any lia­bil­i­ty or in­debt­ed­ness of Bor­rower
or any entity compris­ing same now or hereaf­ter held by Guarantor or any affil­iate
of Guar­antor to the obliga­tions of Borrower under the Loan Docu­ments. The
forego­ing, howev­er, shall not be deemed in any way to limit any rights that
Guaran­tor may have pursuant to the Agreement of Limited Part­nership of
Borrower or which it may have at law or in equity with respect to any other
partners of Borrower.

8.             Guarantor represents and warrants
to the Administrative Agent and the Banks with the knowl­edge that the
Administrative Agent and the Banks are rely­ing upon the same, as follows:

(a)           as
of the date hereof, Guarantor is the sole gener­al partner of Bor­row­er;

(b)           based
upon such relationship, Guarantor has determined that it is in its best
interests to enter into this Guaranty;

(c)           this
Guaranty is necessary and convenient to the conduct, promotion and attainment
of Guarantor’s business, and is in furtherance of Guarantor’s business
purposes;

(d)           the
benefits to be derived by Guarantor from Borrower’s access to funds and other
credit made possible by the Loan Documents are at least equal to the
obligations undertaken pursuant to this Guaranty;

 6
 

(e)           Guarantor
is solvent and has full power and legal right to enter into this Guaranty and
to perform its obligations under the terms hereof and (i) Guaran­tor is
organized and validly existing under the laws of the State of Maryland, (ii)
Guar­an­tor has complied with all provi­sions of appli­cable law in connection
with all aspects of this Guaranty, and (iii) the person executing this Guar­anty
has all the requi­site power and au­thority to execute and deliver this
Guaranty;

(f)            to
the best of Guarantor’s knowledge, there is no action, suit, proceeding, or
investiga­tion pending or threatened against or affecting Guarantor at law, in
equity, in admiralty or before any arbitrator or any governmental department,
commission, board, bureau, agency or instrumen­tality (domestic or foreign)
which is likely to mate­rially and adversely affect the property, assets or
condi­tion (financial or otherwise) of Guaran­tor or which is likely to
materially and adversely impair the abili­ty of Guar­antor to perform its
obligations under this Guaran­ty;

(g)           the
execution and delivery of and the perfor­mance by Guaran­tor of its obligations
under this Guaranty have been duly authorized by all necessary action on the
part of Guarantor and do not (i) violate any provision of any law, rule, regula­tion
(including, without limitation, Regulation U or X of the Feder­al Reserve Board
of the United States), order, writ, judgment, de­cree, deter­mina­tion or award
presently in effect having appli­cabil­i­ty to Guarantor or the organiza­tional
docu­ments of Guar­an­tor, the consequences of which violation would mate­rially
and adversely affect the property, assets or condi­tion (financial or
otherwise) of Guaran­tor or which is likely to mate­rially and adversely impair
the abili­ty of Guar­antor to perform its obligations under this Guaran­ty or
(ii) vio­late or conflict with, result in a breach of or consti­tute (with due
notice or lapse of time or both) a default under any inden­ture, agree­ment or
other instrument to which Guaran­tor is a party, or by which Guarantor or any
of its proper­ty is bound, the consequences of which violation, conflict,
breach or default would mate­rially and adversely affect the proper­ty, assets
or condi­tion (financial or other­wise) of Guaran­tor or which is likely to
mate­rially and adversely impair the abili­ty of Guar­antor to per­form its
obligations under this Guaran­ty;

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(h)           this
Guaranty has been duly executed by Guaran­tor and constitutes the legal, valid
and binding obligation of Guarantor, enforceable against it in accordance with
its terms except as enforce­abili­ty may be limited by applicable insol­vency,
bank­ruptcy or other laws affecting creditors’ rights generally or general
principles of equity, whether such en­forceability is considered in a
proceeding in equity or at law;

(i)            no
authorization, consent, approval, li­cense or formal exemp­tion from, nor any
filing, declara­tion or registration with, any Federal, state, local or foreign
court, governmental agency or regulatory authority is required in connection
with the making and performance by Guarantor of this Guar­anty, except those
which have already been obtained;

(j)            Guarantor
is not an “in­vestment com­pany” as that term is defined in, nor is it
otherwise sub­ject to regulation under, the Invest­ment Company Act of 1940, as
amended;

(k)           Guarantor
is not engaged principally, or as one of its important activities, in the
business of purchas­ing, carrying, or extending credit for the purpose of
purchasing or carrying any margin stock (within the meaning of Regulation U of
the Board of Governors of the Federal Reserve System of the United States); and

(l)            All
of the representations and warranties in the Credit Agree­ment concerning
Guarantor are true and correct.

Guarantor
covenants that it will comply or cause compliance with all covenants in the
Credit Agreement which are applicable to it.

9.  Guarantor and the Administrative Agent each
acknowl­edge and agree that this Guaranty is a guarantee of payment and perfor­mance
and not of collection and en­forcement in respect of any obligations which may
accrue to the Administrative Agent and/or the Banks from Borrower under the
provisions of any Loan Docu­ment.

10.  Subject to the terms and conditions of the
Credit Agreement, and in conjunction therewith, the Administrative Agent or any
Bank may assign any or all of its rights under this Guaranty.  In the event of any such assign­ment, the
Adminis­trative Agent shall give Guar­an­tor prompt notice of same.  If the Administrative Agent or any Bank
elects to sell all the 

 8
 

Loans or participations
in the Loans and the Loan Docu­ments, including this Guaran­ty, the
Administrative Agent or any Bank may for­ward to each pur­chas­er and prospec­tive
purchaser all documents and infor­ma­tion relating to this Guaranty or to
Guaran­tor, whether fur­nished by Borrower or Guarantor or other­wise, subject
to the terms and conditions of the Credit Agree­ment.

11.  Guarantor agrees, upon the written request of
the Administrative Agent, to execute and deliver to the Administrative Agent,
from time to time, any modification or amendment hereto or any addi­tional
instruments or documents reason­ably considered necessary by the Administrative
Agent or its coun­sel to cause this Guar­an­ty to be, become or remain valid
and effective in accor­dance with its terms, provid­ed, that any such modifi­cation,
amendment, additional in­strument or docu­ment shall not increase Guarantor’s
obligations or dimin­ish its rights hereunder and shall be reasonably satis­factory
as to form to Guarantor and to Guarantor’s coun­sel.

12.  The representations and warranties of Guar­antor
set forth in this Guaranty shall survive until this Guaranty shall terminate in
accordance with the terms hereof.

13.  This Guaranty contains the entire agree­ment
among the parties with respect to the subject matter hereof and super­sedes all
prior agreements relating to such subject matter and may not be modified,
amended, supplemented or dis­charged except by a written agreement signed by
Guarantor and the Administrative Agent (acting with the requisite consent of
the Banks as provided in the Credit Agreement).

14.  If all or any portion of any provision con­tained
in this Guaranty shall be determined to be inval­id, illegal or unenforceable
in any respect for any reason, such provision or portion thereof shall be
deemed stricken and severed from this Guaranty and the remaining provisions and
portions thereof shall continue in full force and effect.

15.  This Guaranty may be executed in counter­parts
which together shall constitute the same instru­ment.

16.   All notices, requests and other communi­cations
to any party hereunder shall be in writing (in­cluding bank wire, facsimile
transmis­sion followed by telephonic confirmation or similar writing) and shall
be ad­dressed to such party at the address set forth below or to such other
address as may be iden­tified by any party in a written notice to the others:

 9
 

 

	
  

  	
   

  	
  If to Guarantor:

  	
   

  	
  Equity Residential

  
	
   

  	
   

  	
   

  	
   

  	
  Two North
  Riverside Plaza

  
	
   

  	
   

  	
   

  	
   

  	
  Suite 400

  
	
   

  	
   

  	
   

  	
   

  	
  Chicago,
  Illinois 60606

  
	
   

  	
   

  	
   

  	
   

  	
  Attn: Chief
  Financial Officer

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  With Copies of

  	
   

  	
   

  
	
   

  	
   

  	
  Notices to

  	
   

  	
   

  
	
   

  	
   

  	
  Guarantor to:

  	
   

  	
  Equity Residential

  
	
   

  	
   

  	
   

  	
   

  	
  Two North
  Riverside Plaza

  
	
   

  	
   

  	
   

  	
   

  	
  Suite 400

  
	
   

  	
   

  	
   

  	
   

  	
  Chicago,
  Illinois 60606

  
	
   

  	
   

  	
   

  	
   

  	
  Attn: General
  Counsel

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
                       and

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
  DLA Piper US LLP

  
	
   

  	
   

  	
   

  	
   

  	
  203 North
  LaSalle Street

  
	
   

  	
   

  	
   

  	
   

  	
  Suite 1900

  
	
   

  	
   

  	
   

  	
   

  	
  Chicago,
  Illinois 60601

  
	
   

  	
   

  	
   

  	
   

  	
  Attn: James M.
  Phipps, Esq.

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  If to the

  	
   

  	
   

  
	
   

  	
   

  	
  Administrative

  	
   

  	
   

  
	
   

  	
   

  	
  Agent:

  	
   

  	
  Bank of America, N.A.

  
	
   

  	
   

  	
   

  	
   

  	
  Structured Debt
  Group

  
	
   

  	
   

  	
   

  	
   

  	
  Mail Code

  
	
   

  	
   

  	
   

  	
   

  	
  231 South
  LaSalle Street

  
	
   

  	
   

  	
   

  	
   

  	
  Chicago, IL
  60697

  
	
   

  	
   

  	
   

  	
   

  	
  Attn:

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  With Copies of

  	
   

  	
   

  
	
   

  	
   

  	
  Notices to the

  	
   

  	
   

  
	
   

  	
   

  	
  Administrative

  	
   

  	
   

  
	
   

  	
   

  	
  Agent to:

  	
   

  	
  Skadden, Arps, Slate,

  
	
   

  	
   

  	
   

  	
   

  	
  Meagher &
  Flom LLP

  
	
   

  	
   

  	
   

  	
   

  	
  Four Times
  Square

  
	
   

  	
   

  	
   

  	
   

  	
  New York, New
  York 10036

  
	
   

  	
   

  	
   

  	
   

  	
  Attn: Martha
  Feltenstein, Esq.

  

 

 10

 

Each such no­tice,
re­quest or other commu­nica­tion shall be effective (i) if given by facsimi­le
transmis­sion, when such facsimile is trans­mitted to the facsimile number
specified in this Sec­tion and the appropriate facsim­ile confir­mation is
received, (ii) if given by certified or registered mail, return receipt
requested, with first class postage prepaid, addressed as afore­said, upon
receipt or refusal to accept delivery, (iii) if given by a nation­ally recog­nized
overnight carrier, 24 hours after such communica­tion is deposited with such
carri­er with postage prepaid for next day delivery, or (iv) if given by any
other means, when deliv­ered at the address speci­fied in this Section.

17.  Any acknowledgment or new promise, whether by
payment of principal or interest or otherwise by Borrower or Guaran­tor, with
respect to the Guaranteed Obliga­tions shall, if the statute of limitations in
favor of Guaran­tor against the Administrative Agent and the Banks shall have
commenced to run, toll the run­ning of such statute of limitations, and if the
period of such statute of limita­tions shall have expired, pre­vent the
operation of such statute of limita­tions.

18.  This Guaranty shall be binding upon Guar­antor
and its successors and assigns and shall inure to the benefit of the
Administrative Agent and the Banks and their suc­ces­sors and permitted as­signs;
provided, however, that the Guarantor may not assign or transfer any of its
rights or obligations hereunder without the prior written consent of all of the
Banks, and any attempted such assignment or transfer without such consent shall
be null and void.

19.  The failure of the Administrative Agent to
enforce any right or remedy hereunder, or promptly to enforce any such right or
remedy, shall not constitute a waiver thereof, nor give rise to any estoppel
against the Administrative Agent or any Bank, nor excuse Guarantor from its
obligations here­un­der.  Any waiver of
any such right or remedy to be en­forceable against the Administrative Agent
and the Banks must be expressly set forth in a writ­ing signed by the Adminis­trative
Agent (acting with the requisite consent of the Banks as provided in the Credit
Agreement).

20.  (a) THIS GUARANTY AND THE RIGHTS AND OBLI­GA­TIONS
OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCOR­DANCE WITH AND BE GOVERNED
BY THE LAWS OF THE STATE OF ILLINOIS.

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(b)           Any legal action or proceeding with
re­spect to this Guaranty and any action for enforcement of any judgment in
respect thereof may be brought in the courts of the State of Illinois or of the
United States of America for the Northern District of Illinois, and, by
execution and delivery of this Guaranty, the Guarantor hereby accepts for
itself and in respect of its property, generally and unconditionally, the non-exclusive
juris­diction of the aforesaid courts and appellate courts from any
thereof.  The Guaran­tor 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 the Guarantor at its address for notices
set forth herein.  The 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 brought in the courts referred to above
and hereby further irrevocably waives and agrees not to plead or claim in any
such court that any such action or proceed­ing brought in any such court has
been brought in an inconvenient forum. 
Nothing herein shall affect the right of the Administrative Agent to
serve process in any other manner per­mit­ted by law or to commence legal
proceedings or other­wise proceed against the Guarantor in any other jurisdic­tion.

(c)           GUARANTOR HEREBY WAIVES ITS RIGHTS TO
A JURY TRIAL OF ANY AND ALL CLAIMS OR CAUSES OF ACTION BASED UPON OR ARISING
OUT OF THIS GUARANTY.  IT IS HEREBY
ACKNOWL­EDGED BY GUARAN­TOR THAT THE WAIVER OF A JURY TRIAL IS A MATERIAL
INDUCEMENT FOR THE ADMINISTRATIVE AGENT AND THE BANKS TO ACCEPT THIS GUAR­ANTY
AND THAT THE LOANS AND OTHER EXTENSIONS OF CREDIT MADE BY THE BANKS ARE MADE IN
RELI­ANCE UPON SUCH WAIVER.  GUARANTOR
FURTHER WARRANTS AND REPRE­SENTS THAT SUCH WAIVER HAS BEEN KNOW­INGLY AND VOLUN­TARILY
MADE, FOLLOWING CONSULTATION WITH LEGAL COUNSEL.  IN THE EVENT OF LITIGA­TION, THIS GUARANTY
MAY BE FILED BY THE ADMINISTRATIVE AGENT IN COURT AS A WRITTEN CONSENT TO A
NON-JURY TRIAL.

(d)           Guarantor does hereby further cove­nant
and agree to and with the Administrative Agent and the Banks that Guarantor may
be joined in any action against Borrower in connec­tion with the Loan Documents
and that recovery may be had against Guarantor in such action or in any
independent action against Guarantor (with respect to the 

 12
 

Guaranteed Obliga­tions),
without the Adminis­trative Agent and the Banks first pursuing or ex­hausting
any remedy or claim against Borrower or its successors or assigns.  Guarantor also agrees that, in an action
brought with respect to the Guaranteed Obligations in any jurisdiction, it
shall be conclusively bound by the judgment in any such action by the
Administrative Agent (wher­ev­er brought) against Borrower or its successors or
as­signs, as if Guarantor were a party to such action, even though Guar­antor
was not joined as a party in such ac­tion.

(e)           Guarantor agrees to pay all reason­able
expenses (including, without limitation, attorneys’ fees and disbursements)
which may be incurred by the Administrative Agent or the Banks in connec­tion
with the en­force­ment of their rights under this Guar­anty, whether or not
suit is initi­ated.

21.  Notwithstanding anything to the contrary con­tained
herein (but subject to Section 6 hereof), this Guaranty shall terminate
and be of no further force or effect upon the full performance and payment of
the Guaranteed Obliga­tions hereunder. 
Upon termination of this Guaranty in accordance with the terms of this
Guaranty, the Administrative Agent promptly shall deliver to Guar­antor such
documents as Guarantor or Guarantor’s counsel reasonably may request in order
to evidence such termi­na­tion.

22.  All of the Administrative Agent’s and the
Banks’ rights and reme­dies under each of the Loan Documents or under this
Guaranty are intended to be distinct, separate and cumu­lative and no such
right or remedy therein or herein mentioned is intended to be in exclusion of
or a waiver of any other right or remedy available to the Administrative Agent
or any Bank.

23.  No claim may be made by Guarantor or any
other Person acting by or through Guarantor against the Administrative Agent or
any Bank or the affiliates, directors, officers, employees, attorneys or agent
of any of them for any consequential or punitive damages in respect of any
claim for breach of contract or any other theory of liability arising out of or
related to the transactions contemplated by this Guaranty or by the other Loan
Documents, or any act, omission or event occurring in connection therewith; and
Guarantor hereby waives, releases and agrees not to sue upon any claim for any
such damages, whether or not accrued and whether or not known or suspected to
exist in its favor.

 

 13

IN WITNESS
WHEREOF, the parties hereto have executed and delivered this Guaranty as of the
date and year first above written.

	
  

  	
   

  	
  GUARANTOR:

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  EQUITY RESIDENTIAL

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
  /s/ Mark J. Parrell

  
	
   

  	
   

  	
   

  	
  Name: Mark J. Parrell

  
	
   

  	
   

  	
   

  	
  Title: Senior Vice President and Treasurer

  
	
   

  	
   

  	
   

  
					

 

	
  

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  ACCEPTED:

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  BANK OF AMERICA,
  N.A.,

  	
   

  	
   

  
	
  AS
  ADMINISTRATIVE AGENT

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
  By:

  	
  /s/ Mark A.
  Mokelke 

  	
   

  	
   

  
	
   

  	
  Name: Mark A. Mokelke

  	
   

  	
   

  
	
   

  	
  Title: Vice President

  	
   

  	
   

  
	
   

  	
   

  	
   

  
					

ACKNOWLEDGMENT FOR
GUARANTOR

	
  STATE OF
  ILLINOIS

  	
   

  	
  )

  
	
   

  	
   

  	
  )ss.

  
	
  COUNTY OF COOK

  	
   

  	
  )

  

 

On February 26, 2007,
before me personally came Mark J. Parrell, to me known to be the person who
executed the foregoing instrument, and who, being duly sworn by me, did depose
and say that he is Senior VP and Treasurer of Equity Residential, and that he
executed the foregoing instrument in the organization’s name, and that he had
authority to sign the same, and he acknowledged to me that he executed the same
as the act and deed of said organization for the uses and purposes therein
mentioned.

[Seal]

 

	
  

  	
   

  	
  /s/ Susan Rozovics

  
	
  

  	
   

  	
  Notary PublicExhibit 10.1

FOURTH
AMENDMENT TO LOAN AND SECURITY AGREEMENT

This Fourth
Amendment to Loan and Security Agreement (this “Amendment”) is entered into as
of January 30, 2007, by and between COMERICA BANK (“Bank”) and COMMODORE
RESOURCES (NEVADA), INC., LYRIS TECHNOLOGIES INC., UPTILT INC., MCC NEVADA,
INC. and CLICKTRACKS ANALYTICS, INC. (each a “Borrower” and collectively, “Borrowers”).

RECITALS

Borrowers and Bank
are parties to that certain Loan and Security Agreement dated as of October 4,
2005, as amended from time to time including by that certain First Amendment to
Loan and Security Agreement dated as of April 25, 2006, that certain Second
Amendment to Loan and Security Agreement dated as of August 18, 2006 and that
certain Third Amendment to Loan and Security Agreement dated as of November 30,
2006 (the “Agreement”). The parties desire to amend the Agreement in accordance
with the terms of this Amendment to change certain of the financial covenants.

NOW, THEREFORE, the parties agree as follows:

1.             Section 6.7(b) of the Agreement is hereby amended and
restated in its entirety to read as follows:

“(b)         EBITDA.  Measured monthly on a rolling three-month
basis, an EBITDA of not less than (i) One Million Two Hundred Thousand Dollars
($1,200,000) for the measuring period ending October 31, 2006, (ii) One Million
One Hundred Thousand Dollars ($1,100,000) for the measuring period ending
November 30, 2006, (iii) One Million Three Hundred Thousand Dollars
($1,300,000) for the measuring period ending December 31, 2006, (iv) One
Million Seven Hundred Fifty Thousand Dollars ($1,750,000) for the measuring
period ending January 31, 2007, (v) Two Million Dollars ($2,000,000) for the
measuring period ending February 28, 2007, and (vi) Two Million Five Hundred
Thousand Dollars ($2,500,000) at all times thereafter.”

2.             Exhibit C to the Agreement is hereby replaced with
Exhibit C attached hereto.

3.             No course of dealing on the part of Bank or its
officers, nor any failure or delay in the exercise of any right by Bank, shall
operate as a waiver thereof, and any single or partial exercise of any such
right shall not preclude any later exercise of any such right. Bank’s failure
at any time to require strict performance by Borrowers of any provision shall
not affect any right of Bank thereafter to demand strict compliance and
performance. Any suspension or waiver of a right must be in writing signed by
an officer of Bank.

4.             Unless otherwise defined, all initially capitalized
terms in this Amendment shall be as defined in the Agreement. The Agreement, as
amended hereby, shall be and remain in full force and effect in accordance with
its respective terms and hereby is ratified and confirmed in all respects. Except
as expressly set forth herein, the execution, delivery, and performance of this
Amendment shall not operate as a waiver of, or as an amendment of, any right,
power, or remedy of Bank under the Agreement, as in effect prior to the date
hereof.

5.             Each Borrower represents and warrants that the
Representations and Warranties contained in the Agreement are true and correct
in all material respects as of the date of this Amendment, and that no Event of
Default has occurred and is continuing.

6.             As a condition to the effectiveness of this Amendment,
Bank shall have received, in form and substance satisfactory to Bank, the
following:

(a)           this Amendment, duly executed by each
Borrower;

(b)           a Certificate of the Secretary of
each Borrower with respect to incumbency and resolutions authorizing the
execution and delivery of this Amendment;

 1
 

(c)           all reasonable Bank Expenses incurred
through the date of this Amendment, which may be debited from any of Borrowers’
accounts; and

(d)           such other documents, and completion
of such other matters, as Bank may reasonably deem necessary or appropriate.

7.             This Amendment may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one instrument.

 2

IN WITNESS
WHEREOF, the undersigned have executed this Amendment as of the first date
above written.

	
  

  	
  COMMODORE RESOURCES (NEVADA), INC.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Richard A. McDonald

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  President

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  LYRIS TECHNOLOGIES INC.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Luis Rivera

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  CEO & President

  
	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  UPTILT RESOURCES INC.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Luis Rivera

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  CEO & President

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  MCC NEVADA, INC.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Richard A. McDonald

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  Secretary & Treasurer

  
	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  CLICKTRACKS ANALYTICS, INC.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Luis Rivera

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  Secretary & Treasurer

  
	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  COMERICA BANK

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Philip Koblis

  
	
   

  	
   

  	
   

  
	
   

  	
  Title:

  	
  First Vice President

  
							

 

 

[Signature
Page to Fourth Amendment to Loan & Security Agreement]

EXHIBIT C

COMPLIANCE CERTIFICATE

TO:                         COMERICA
BANK

FROM:                  COMMODORE
RESOURCES (NEVADA), INC., for itself and on behalf of all Borrowers

The undersigned authorized
officer of COMMODORE RESOURCES (NEVADA), INC., for itself and on behalf of all
Borrowers, hereby certifies that in accordance with the terms and conditions of
the Loan and Security Agreement between Borrowers and Bank (the “Agreement”),
(i) Each Borrower is in complete compliance for the period ending                                 
with all required covenants except as noted below and (ii) all
representations and warranties of each Borrower stated in the Agreement are
true and correct as of the date hereof. 
Attached herewith are the required documents supporting the above
certification.  The Officer further
certifies that these are prepared in accordance with Generally Accepted
Accounting Principles (GAAP) and are consistently applied from one period to
the next except as explained in an accompanying letter or footnotes.

Please indicate compliance
status by circling Yes/No under “Complies” column.

	
  Reporting Covenant

  	
   

  	
  Required

  	
   

  	
  Complies

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Monthly financial statements

  	
   

  	
  Monthly within 30 days

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  10K

  	
   

  	
  Within 90 days of fiscal year end

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  10Q

  	
   

  	
  Within 45 days of quarter end

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  A/R & A/P Agings

  	
   

  	
  Monthly within 30 days

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  Compliance Cert.

  	
   

  	
  Monthly within 30 days

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  A/R Audit

  	
   

  	
  Initial and Annual

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  IP Report

  	
   

  	
  Quarterly within 45 days

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  Total amount of Borrowers’ cash and investments

  	
   

  	
  Amount: $           

  	
   

  	
  Yes

  	
   

  	
  No

  
	
  Total amount of Borrowers’ cash and investments
  maintained with Bank

  	
   

  	
  Amount: $           

  	
   

  	
  Yes

  	
   

  	
  No

  

 

	
  Financial Covenant

  	
   

  	
  Required

  	
   

  	
  Actual

  	
   

  	
  Complies

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Measured on a Monthly Basis:

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Maximum Senior
  Debt to EBITDA

  Through 11/30/07

  12/1/067 and thereafter

  	
   

  	
  2.00:1.00

  1.50:1.00

  	
   

  	
        : 1.00

  	
   

  	
  Yes

  	
   

  	
  No

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Minimum EBITDA

  10/1/06 through 10/31/06

  11/1/06 through 11/30/06

  12/1/06 through 12/31/06

  1/1/07 through 1/31/07

  2/1/07 through 2/28/07

  3/1/07 and thereafter

  	
   

  	
  

  $1,200,000

  $1,100,000

  $1,300,000

  $1,750,000

  $2,000,000

  $2,500,000

  	
   

  	
  $             

  	
   

  	
  Yes

  	
   

  	
  No

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Minimum Fixed
  Charge Coverage

  	
   

  	
  1.25 : 1.00

  	
   

  	
        : 1.00

  	
   

  	
  Yes

  	
   

  	
  No

  

 

	
  Comments Regarding Exceptions: See Attached.

  	
   

  	
  BANK USE ONLY

  
	
   

  	
   

  	
   

  
	
  Sincerely,

  	
   

  	
  Received by:

  	
   

  
	
   

  	
   

  	
   

  	
  AUTHORIZED
  SIGNER

  
	
   

  	
   

  	
   

  	
   

  	
  Date:

  	
   

  
	
   

  	
   

  	
   

  
	
  SIGNATURE

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
  Verified:

  	
   

  
	
  TITLE

  	
   

  	
   

  	
  AUTHORIZED
  SIGNER

  
	
   

  	
   

  	
   

  	
   

  	
  Date:

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  DATE

  	
   

  	
  Compliance Status 

  	
  Yes

  	
  No

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