Document:

<PAGE>   1
                                                                     Exhibit 4.5

                  VOTING AGREEMENT, dated as of February 14, 2000, by and among
Lexent Inc. (the "Company"), Hugh J. O'Kane, Jr. ("Hugh O'Kane"), and Kevin M.
O'Kane ("Kevin O'Kane" and together with Hugh O'Kane, the "Stockholders").

                  WHEREAS, Hugh O'Kane and Kevin O'Kane are stockholders of the
Company and wish to provide for the continuity and stability of the policy and
management of the Company in the event that either dies; and

                  WHEREAS, Hugh O'Kane is about to establish the Hugh J. O'Kane,
Jr. 2000 Grantor Retained Annuity Trust (the "GRAT Trust") and the Hugh J.
O'Kane, Jr. 2000 Remainder Trust (the "Remainder Trust" and together with the
GRAT Trust, the "Trusts"), and he is initially going to transfer 1,400,000
shares of Common Stock, $.001 par value, of the Company ("Common Stock"), to the
GRAT Trust, which shares he wishes to be and remain subject to the provisions of
this Voting Agreement;

                  NOW, THEREFORE, in consideration of the premises and mutual
covenants herein contained, and other good and valuable consideration, the
parties hereto agree as follows:

                  SECTION 1.  Voting Agreement; Proxies.

                  (a) Hugh O'Kane agrees that in the event of his death, Kevin
O'Kane shall have, for a period of three (3) years from such date (the "HOK
Voting Period"), the unilateral right to vote all shares of capital stock (and
other voting interests) of the Company (and any other shares of capital stock or
other equity interests of any successor entity or as may result from any
reorganization, reclassification, merger, or similar event, as the case may be
(such shares and interests are collectively referred to herein as the "HOK
Voting Shares")) owned of record or beneficially by him at his death, and,
accordingly, the undersigned Hugh O'Kane hereby irrevocably appoints Kevin
O'Kane as his lawful proxy agent to vote any or all of the aforementioned HOK
Voting Shares during the HOK Voting Period at any and all general or special
meetings of stockholders, whether in person, by proxy or by written consent.

                  Hugh O'Kane expressly intends that this Agreement shall be
binding upon his heirs, beneficiaries, legatees, executors, trustees and legal
guardians. Hugh O'Kane acknowledges that the Common Stock being transferred by
him to the GRAT Trust (and thereafter to the Remainder Trust) is and shall
remain subject to this Agreement.

                  (b) Kevin O'Kane agrees that in the event of his death, Hugh
O'Kane shall have, for a period of three (3) years from such date (the "KOK
Voting Period"), the unilateral right to vote all shares of capital stock (and
other voting interests) of the Company (and any other shares of capital stock or
other equity interests of any successor entity or as may result from any
reorganization, reclassification, merger, or similar event, as the case may be
(such shares and interests are collectively referred to herein as the "KOK
Voting Shares," and together with the HOK Voting Shares, as the "Voting
Shares")) owned of record or beneficially by him at his
<PAGE>   2
death, and, accordingly, the undersigned Kevin O'Kane hereby irrevocably
appoints Hugh O'Kane as his lawful proxy agent to vote any or all of the
aforementioned KOK Voting Shares during the KOK Voting Period at any and all
general or special meetings of stockholders, whether in person, by proxy or by
written consent. Kevin O'Kane expressly intends that this Agreement shall be
binding upon his heirs, beneficiaries, legatees, executors, trustees and legal
guardians.

                  SECTION 2. Restriction on Transfer. No Stockholder shall
transfer any Voting Shares during the term of this Agreement unless, in each
case, either (i) the recipient of such Voting Shares shall agree in writing to
be bound by and comply with all applicable provisions of this Agreement as fully
as required of the transferor and be deemed to be a Stockholder hereunder, or
(ii) the transfer is pursuant to a registered public offering under the
Securities Act of 1933, as amended (the "Act") or pursuant to Rule 144 under the
Act.

                  SECTION 3. Legend on Stock Certificates. Each certificate
representing Voting Shares shall conspicuously bear the following legend until
such time as the shares represented thereby are no longer subject to the
provisions hereof:

                  "THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE
                  TERMS AND CONDITIONS OF AN AGREEMENT, DATED FEBRUARY 14, 2000,
                  AMONG THE COMPANY, HUGH J. O'KANE, JR., KEVIN M. O'KANE.
                  COPIES MAY BE OBTAINED AT NO COST BY WRITTEN REQUEST MADE BY
                  THE HOLDER OF RECORD OF THIS CERTIFICATE TO THE COMPANY."

                  The Company covenants that it shall file a copy of this
Agreement in its stock books and shall keep a copy thereof at its corporate
headquarters.

                  SECTION 4. Duration of Agreement. This Agreement shall
terminate upon the earlier to occur of either the (i) third anniversary of the
death of the first to die of Hugh O'Kane or Kevin O'Kane or (ii) the first date
upon which both individuals are deceased.

                  SECTION 5. Representations and Warranties. Each Stockholder,
severally and not jointly, represents and warrants to the Company and the other
Stockholders as follows:

                  (a) The execution, delivery and performance of this Agreement
by such Stockholder will not violate any provision of law, any order of any
court or other agency of government, or any provision of any indenture,
agreement or other instrument to which such Stockholder or any of its or his
properties or assets is bound, or conflict with, result in a breach of or
constitute (with due notice or lapse of time or both) a default under any such
indenture, agreement or other instrument, or result in the creation or
imposition of any lien, charge or encumbrance of any nature whatsoever upon any
of the properties or assets of such Stockholder.

                  (b) This Agreement has been duly executed and delivered by
such Stockholder
<PAGE>   3
and, when executed by the other parties hereto, constitutes the legal, valid and
binding obligation of such Stockholder, enforceable in accordance with its
terms, subject, as to enforcement of remedies, to applicable bankruptcy,
insolvency, fraudulent conveyance and similar laws and to limitations on the
availability of equitable remedies.

                  (c) The shares of Common Stock listed in Annex I opposite the
name of such Stockholder constitute all the shares of the capital stock of the
Company owned by such Stock holder on the date hereof.

                  SECTION 6. Headings. Headings of articles, sections and
paragraphs of this Agreement are inserted for convenience of reference only and
shall not affect the interpretation or be deemed to constitute a part hereof.

                  SECTION 7. Severability. In the event that any one or more of
the provisions contained in this Agreement or in any other instrument referred
to herein shall, for any reason, be held to be invalid, illegal or
unenforceable, such illegality, invalidity or unenforceability shall not affect
any other provisions of this Agreement.

                  SECTION 8. Benefits of Agreement. Nothing expressed by or
mentioned in this Agreement is intended or shall be construed to give any person
other than the parties hereto and their respective successors and permitted
assigns any legal or equitable right, remedy or claim under or in respect of
this Agreement or any provision herein contained, this Agreement and all
conditions and provisions hereof being intended to be and being for the sole and
exclusive benefit of the parties hereto and their respective successors and
permitted assigns.

                  SECTION 9. Notices. Any notice or other communications
required or permitted hereunder shall be deemed to be sufficient and received if
contained in a written instrument delivered in person or by courier or duly sent
by first class certified mail, postage prepaid, or by telecopy addressed to such
party at the address or telecopy number set forth below:

                  (1)      if to the Company, to it at:

                            Lexent Inc.
                            3 New York Plaza
                            New York, NY 10004
                            Attention: Chairman
                            Telecopy: (212) 981-2493

                           with a copy to:

                           Reboul, MacMurray, Hewitt,
                           Maynard & Kristol
                           45 Rockefeller Plaza
                           New York, NY 10111

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                           Attention: Joshua A. Leuchtenburg, Esq.
                           Telecopy: (212) 841-5725

                  (2) if to any Stockholder, to it at its address appearing on
Annex I hereto;

or, in any case, at such other address or telecopy number as shall have been
furnished in writing by such party to the other parties hereto. All such
notices, requests, consents and other communications shall be deemed to have
been received (a) in the case of personal or courier delivery, on the date of
such delivery, (b) in the case of mailing, on the fifth business day following
the date of such mailing and (c) in the case of telecopy, when received.

                  SECTION 10. Modification. Except as otherwise provided herein,
neither this Agreement nor any provision hereof may be modified, changed,
discharged or terminated except by an instrument in writing signed by the
parties hereto.

                  SECTION 11. Counterparts. This Agreement may be executed in
any number of counterparts, and each such counterpart hereof shall be deemed to
be an original instrument, but all such counterparts together shall constitute
but one agreement.

                  SECTION 12. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY
THE LAWS OF THE STATE OF DELAWARE.
<PAGE>   5
                  IN WITNESS WHEREOF, each of the parties hereto has executed
this Agreement as a sealed instrument, all as of the day and year first above
written.

                               LEXENT INC.

                               By  /s/ HUGH O'KANE, JR.
                                  ----------------------------------
                                    Name: Hugh J. O'Kane, Jr.
                                    Title: Chairman

                                         /s/ HUGH O'KANE, JR.
                                  ----------------------------------
                                          Hugh J. O'Kane, Jr.

                                         /s/ KEVIN M. O'KANE
                                  ----------------------------------
                                           Kevin M. O'Kane

ACKNOWLEDGED AND CONSENTED TO
AS OF FEBRUARY 14, 2000

By /s/ PATRICIA O'KANE
   -------------------------------
   Name of Spouse: Patricia O'Kane

By /s/ MARGARET O'KANE
   -------------------------------
   Name of Spouse: Margaret O'Kane

HUGH J. O'KANE, JR. 2000 GRANTOR RETAINED ANNUITY TRUST

By /s/ KEVIN M. O'KANE
   --------------------------------
   Name of Trustee: Kevin M. O'Kane

By /s/ PATRICIA O'KANE
   --------------------------------
   Name of Trustee: Patricia O'Kane

HUGH J. O'KANE, JR. 2000 REMAINDER TRUST

By /s/ KEVIN M. O'KANE
   --------------------------------
   Name of Trustee: Kevin M. O'Kane

By /s/ PATRICIA O'KANE
   --------------------------------
   Name of Trustee: Patricia O'Kane<PAGE>   1
                                                                    Exhibit 10.2

                                   LEXENT INC.

                        Incentive Stock Option Agreement

                                                                          , 2000

Employee/Optionee:

Number of shares of
Common Stock subject
to this Agreement:                  SHARES

            Pursuant to the Lexent Inc. and its Subsidiaries Amended and
Restated Stock Option and Restricted Stock Purchase Plan (the "Plan"), the Board
of Directors of Lexent Inc. (the "Company") has granted to you on this date an
option (the "Option") to purchase in the aggregate, on the terms and subject to
the conditions set forth herein,          shares of the Company's Common Stock,
$.001 par value ("Common Stock"). Such shares (as the same may be adjusted as
described in Section 11 below) are herein referred to as the "Option Shares".
The Option shall constitute and be treated at all times by you and the Company
as an "incentive stock option" as defined under Section 422(b) of the Internal
Revenue Code of 1986, as amended (the "Code"). The terms and conditions of the
Option are set out below.

            1. Date of Grant. The Option is granted to you on           , 2000
(the "Grant Date").

            2. Termination of Option. Your right to exercise the Option (and to
purchase the Option Shares) shall expire and terminate in all events on the
earlier of (i) ten years from the Grant Date or (ii) the date provided in
Section 8 below in the event you cease to be employed by the Company or any
"Subsidiary" or "Parent" thereof ("Subsidiary" and "Parent" are defined herein
as defined in the Plan).

            3. Option Price. The purchase price to be paid upon the exercise of
the Option is $           per share, the fair market value of a share of
Common Stock (as determined by the Board of Directors of the Company) on the
Grant Date (subject to adjustment as provided in Section 11 hereof).
<PAGE>   2
            4. Vesting Provisions. The Option shall be exercisable as follows:
25% shall be exercisable 12 months after the Grant Date, and the balance shall
be exercisable on an equal monthly basis at the end of each month thereafter for
the following 36 months (in each case rounded to the nearest whole share).

            5. Additional Provisions Relating to Exercise. (a) Once you become
entitled to exercise the Option (and purchase Option Shares) as provided in
Section 4 hereof, such right will continue until the date on which such Option
expires and terminates pursuant to Section 2 hereof, unless otherwise stipulated
herein. Notwithstanding anything contained herein to the contrary, no new rights
to exercise the Option with respect to any Option Shares shall be acquired under
Section 4 hereof after the date on which you cease to be employed on a full-time
basis by the Company or any Subsidiary or Parent thereof.

            (b) The Board of Directors of the Company, in its sole discretion,
may at any time accelerate the time set forth in Section 4 at which the Option
may be exercised by you with respect to any Option Shares.

            6. Exercise of Option. To exercise the Option, you must deliver a
completed copy of the attached Option Exercise Form to the address indicated on
the Form, specifying the number of Option Shares being purchased as a result of
such exercise, together with payment of the full option price for the Option
Shares being purchased. Payment of the option price must be made in cash or by
check or such other consideration acceptable to the Board of Directors of the
Company in its sole discretion.

            7. Transferability of Option. You may not transfer the Option (other
than by will or the laws of descent and distribution). The Option may be
exercised during your lifetime only by you.

            8. Termination of Employment. (a) In the event that (i) your
employment by the Company or any Subsidiary or Parent thereof is terminated by
such entity for cause or (ii) you terminate your employment by such entity for
any reason whatsoever other than as a result of your death or "disability"
(within the meaning of Section 22(e)(3) of the Code), then the Option may only
be exercised within 15 days after the date on which you ceased to be so
employed, and only to the extent that you could have otherwise exercised the
Option as of the date on which you ceased to be so employed.

             (b) In the event that you cease to be employed on a full-time basis
by the Company or any Subsidiary or Parent thereof for any reason other than (x)
a termination specified in Section 8(a) above or (y) by reason of your death or
"disability" (within the meaning of Section 22(e)(3) of the Code), then the
Option may only be exercised within 30 days after the date on which you ceased
to be so employed, and only to the extent that you could have otherwise
exercised the Option as of the date on which you ceased to be so employed.

                                       2
<PAGE>   3
            (c) In the event that you cease to be employed on a full-time basis
by the Company or any Subsidiary or Parent thereof by reason of a "disability"
(within the meaning of Section 22(e)(3) of the Code), then the Option may only
be exercised within 180 days after the date you cease to be so employed, and
only to the same extent that you were entitled to exercise the Option on the
date you ceased to be so employed by reason of such disability and had not
previously done so.

            (d) In the event that you die while employed by the Company or any
Subsidiary or Parent thereof (or within a period of 15 days after ceasing to be
employed by the Company or any Subsidiary or Parent thereof for any reason
described in Section 8(a) or 8(b) above, or within a period of 180 days after
ceasing to be so employed for any reason described in Section 8(c) above), then
the Option may only be exercised within 180 days after your death. In such
event, the Option may be exercised during such 180 day period by the executor or
administrator of your estate or by any person who shall have acquired the Option
through bequest or inheritance, but only to the same extent that you were
entitled to exercise the Option immediately prior to the time of your death and
you had not previously done so.

            (e) Notwithstanding any provision contained in this Section 8 to the
contrary, in no event may the Option be exercised to any extent by anyone after
the tenth anniversary of the Grant Date.

            9. Representations. (a) You represent and warrant to the Company
that, upon exercise of the Option, you will be acquiring the Option Shares
attributable to such Option for your own account for the purpose of investment
and not with a view to or for sale in connection with any distribution thereof,
and you understand that (i) neither the Option nor any Option Shares have been
registered with the Securities and Exchange Commission by reason of their
issuance in a transaction exempt from the registration requirements and (ii) any
Option Shares must be held indefinitely by you unless a subsequent disposition
thereof is registered under the Securities Act or is exempt from such
registration. The stock certificates for any Option Shares issued to you will
bear the following legend:

            THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
            UNDER THE SECURITIES ACT OF 1933 AND MAY NOT BE SOLD, TRANSFERRED OR
            OTHERWISE DISPOSED OF UNLESS THEY HAVE BEEN REGISTERED UNDER THAT
            ACT OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE.

            (b) You further represent and warrant that you understand the
Federal, state and local income tax consequences of the granting of the Option
to you, the acquisition of rights to exercise the Option with respect to any
Option Shares, the exercise of the Option and purchase of Option Shares, and the
subsequent sale or other disposition of any Option Shares. In addition, you
understand that any "disqualifying disposition" of any Option Shares may result
in the Company being required to withhold Federal, state or local taxes
(including social security and

                                       3
<PAGE>   4
medicare taxes) in respect of any compensation income realized by you as a
result of the exercise of the Option, which compensation income shall generally
equal the excess of the fair market value of any Option Shares received upon
exercise of the Option at the time of exercise over the exercise price of the
Option. To the extent that the Company is required to withhold any such taxes as
a result of the exercise of the Option and the "disqualifying disposition" of
any Option Shares, you hereby agree that the Company may deduct from any
payments of any kind otherwise due to you an amount equal to the total Federal,
state and local taxes required to be so withheld, or if such payments are
inadequate to satisfy such Federal, state and local taxes, or if no such
payments are due or to become due to you, then you agree to provide the Company
with cash funds or make other arrangements satisfactory to the Company regarding
such payment. It is understood that all matters with respect to the total amount
of taxes to be withheld in respect of any such compensation income shall be
determined by the Board of Directors in its sole discretion.

            10. Notice of Sale. You agree to give the Company prompt notice of
any sale or other disposition of any Option Shares that occurs (i) within two
years from the Grant Date or (ii) within one year after the transfer of such
Option Shares to you upon the exercise of the Option.

            11. Adjustments; Reorganization, Reclassification, Consolidation,
Merger or Sale. (a) In the event that, after the date hereof, the outstanding
shares of Common Stock shall be increased or decreased or changed into or
exchanged for a different number or kind of shares of stock or other securities
of the Company or of another corporation in each such case through
reorganization, merger or consolidation, recapitalization, reclassification,
stock split, split-up, combination or exchange of shares or declaration of any
dividends payable in Common Stock, the Board of Directors of the Company shall,
in good faith, appropriately adjust the number of shares of Common Stock (and
the option price per share) subject to the unexercised portion of the Option (to
the nearest possible full share), and such adjustment shall be effective and
binding for all purposes of this Agreement and the Plan, subject to the
limitations of Section 424 of the Code.

            (b) If any capital reorganization or reclassification of the capital
stock of the Company or any consolidation or merger of the Company with another
corporation, or the sale of all or substantially all its assets to another
corporation, shall be effected after the date hereof in such a way that holders
of Common Stock shall be entitled to receive stock, securities or assets with
respect to or in exchange for Common Stock, then you shall thereafter have the
right to receive upon the basis and upon the terms and conditions specified in
the Option and in lieu of the shares of Common Stock of the Company immediately
theretofore receivable upon the exercise of the Option, such shares of stock,
securities or assets (including cash) as may be issued or payable with respect
to or in exchange for a number of outstanding shares of such Common Stock equal
to the number of shares of such stock immediately theretofore so receivable had
such reorganization, reclassification, consolidation, merger or sale not taken
place.

            (c) Notwithstanding Section 4 hereof, following a "Change of
Control" (as defined below), you shall become entitled to immediately exercise
the Option with respect to

                                       4
<PAGE>   5
50% of the previously unexercisable Option Shares, and the balance shall become
exercisable according to the original schedule set forth in Section 4 above, in
each case until the Option expires and terminates pursuant to Section 2 hereof.
For purposes of the foregoing, "Change of Control" shall mean any capital
reorganization, consolidation, merger or sale of assets as a result of which or
in connection with which a person, corporation or other entity other than Kevin
and Hugh O'Kane acquires (x) ownership of more than 50% of the equity securities
of the Company or (y) all or substantially all of the assets and properties of
the Company as an entirety.

            12. Continuation of Employment. Neither the Plan nor the Option
shall confer upon you any right to continue in the employ of the Company or any
Subsidiary or Parent thereof, or limit in any respect the right of the Company
or any Subsidiary or Parent thereof to terminate your employment or other
relationship with the Company or any Subsidiary or Parent thereof, as the case
may be, at any time.

            13. Plan Documents. This Agreement is qualified in its entirety by
reference to the provisions of the Plan applicable to "incentive stock options"
as defined in Section 422(b) of the Code, which are hereby incorporated herein
by reference.

            14. General Provisions. (a) This Option Agreement shall be governed
by and construed in accordance with the laws of the State of New York. If any
one or more provisions of this Agreement shall be found to be illegal or
unenforceable in any respect, the validity and enforceability of the remaining
provisions hereof shall not in any way be affected or impaired thereby.

            (b) This Agreement and the Plan contain the entire agreement between
the Company and you relating to the Option. Except as expressly provided in this
Agreement or the Plan with respect to certain actions permitted to be taken by
the Board of Directors of the Company or the Committee (as defined in the Plan)
with respect to this Agreement and the terms of the Option, this Agreement may
not be amended, modified, changed or waived other than by written instrument
signed by the parties hereto.

            (c) This Agreement may be executed in two or more counterparts, each
of which shall be deemed to be an original, but all of which together shall
constitute one and the same instrument.

                                       5
<PAGE>   6
            Please acknowledge receipt of this Agreement by signing the enclosed
copy of this Agreement in the space provided below and returning it promptly to
the Secretary of the Company.

                                       LEXENT INC.

                                       By __________________________________
                                          Name:
                                          Title:

Accepted and Agreed to
As of                  , 2000:

__________________________________

                                       6
<PAGE>   7
                                   LEXENT INC.
                 STOCK OPTION AND RESTRICTED STOCK PURCHASE PLAN

                              OPTION EXERCISE FORM

            I,___________________ , a Participant under the Lexent Inc. and its
Subsidiaries Amended and Restated Stock Option and Restricted Stock Purchase
Plan (the "Plan"), do hereby exercise the right to purchase __________ shares of
Common Stock, $.001 par value, of Lexent Inc. pursuant to the incentive stock
option granted to me on _________, ____ under the Plan. Enclosed herewith is
$__________ , an amount equal to the total exercise price for the shares of
Common Stock being purchased pursuant to this Option Exercise Form.

Date:_____________________                           __________________________
                                                                 Signature

             Send a completed copy of this Option Exercise Form to:

                        Lexent Inc.
                        3 New York Plaza
                        New York, New York 10004
                        Attention: Kevin O'Kane
                                   Corporate Secretary

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