Document:

<PAGE>

                                                                   Exhibit 10.27
                                                                   -------------

                                   SUBLEASE

     THIS SUBLEASE dated as of __________, 2000 between Banyan Systems
Incorporated (the "Sublandlord") and Switchboard Incorporated (the "Subtenant").

                                   ARTICLE I

                                REFERENCE DATA

     1.1  Subjects Referred To.
          --------------------

     Each reference in this Sublease to any of the following subjects shall be
construed to incorporate the data stated for that subject in this Section 1.1:

<TABLE>
<S>                       <C>
Date of Sublease:         _____________, 2000

Sublandlord:              Banyan Systems Incorporated, a Massachusetts corporation

Sublandlord's Address:    120 Flanders Road, Westboro, Massachusetts  01581

Subtenant:                Switchboard Incorporated, a Delaware corporation

Subtenant's Address:      115 Flanders Road, Westboro, Massachusetts  01581

Headlandlord:             BerTech Flanders, LLC

Headlandlord's Address:   c/o Steve Brooks, Asset Manager
                          Berkley Investment Inc.
                          121 High Street
                          Boston, MA 02110

Headlease:                Lease Agreement dated as of November 14, 1986 by and between Arthur DiMartino, Jr., Trustee of
                          Flanders Realty Trust, as landlord, and Sublandlord, as tenant., as amended by a Lease Addendum dated
                          August 28, 1987, a Lease Addendum dated January 5, 1988, a Lease Extension and Modification Agreement
                          effective as of January 1, 1992, a Lease Extension and Modification Agreement dated April 15, 1993,
                          and a Fifth Lease Extension and Modification Agreement dated as of October 15, 1997.
</TABLE>
<PAGE>

<TABLE>
<S>                       <C>
Headleased Premises:      The premises situated at 115 Flanders Road, Westboro, Massachusetts, as described in the Headlease,
                          containing approximately 64,654 rentable square feet (constituting all of the rentable square feet in
                          the building) (the "Building").

Premises:                 The Premises are shown on Exhibit B attached hereto. Beginning on March 1, 2000 the Premises shall also
                          include space shown on Exhibit C attached hereto.

Rentable Floor Area

of Premises:              9,572 Rentable Square Feet on the first floor of the Building. Beginning on March 1, 2000 the rentable
                          floor area of the Premises shall increase to 18,089 rentable square feet. Exact square footage shall be
                          verified by an architect in accordance with BOMA standards.

Commencement Date:        ___________________, 2000

Term Expiration Date:     ___________________, 2002

Extension Option:         Subtenant shall have option to extend term until
                          September 30, 2005.

Rent Commencement
     Date:                ___________________, 2000

Monthly Fixed Rent:       Time Period                        Monthly Rent
                          -----------                        ------------

                          3/1/2000-12/31/2002                $25,551.00

Security Deposit:         None

Permitted Uses:           All permitted uses in the Headlease.

Parking Spaces:           Subtenant shall be entitled to use 80 parking spaces. Subject to prior written approval of Headlandlord
                          under the terms of the Headlease, Subtenant, at Subtenant's expense, may install several visitor parking
                          spaces in front of the entrance to the Premises.

Signs:                    Subject to prior written approval and signage criteria of Headlandlord under the terms of the Headlease,
                          Subtenant, at Subtenant's expense, may place signage at the entrance to
</TABLE>

                                       2
<PAGE>

          the Premises. Subtenant shall have its name and suite number inserted
          into the building directory.

     1.2  Exhibits.
          --------

     The exhibits listed below in this section are incorporated in this Sublease
by reference and are to be construed as part of this Sublease:

          EXHIBIT A           Headlease
          EXHIBIT B & C       Floor Plan of Premises

                                       3
<PAGE>

                                   ARTICLE II

                               PREMISES AND TERM

     2.1  Premises.  Subject to and with the benefit of the provisions of this
          --------
Sublease, Sublandlord hereby subleases the Premises to Subtenant, and Subtenant
subleases the Premises from Sublandlord.

     The Premises are subleased in their condition "as is" on the Commencement
Date.

     2.2  Term.  To have and to hold beginning on the Commencement Date and
          ----
continuing until the Term Expiration Date (the "Term"), subject to earlier
termination as provided herein.

     2.3  Early Access. Sublandlord shall allow Subtenant access to the Premises
          ------------
prior to the Commencement Date to install cabling, telephone systems, furniture
partitions and to perform other necessary tenant improvement s.  Prior to
Subtenant's entry into the Premises as permitted hereunder, Subtenant shall
submit a schedule to Sublandlord (and Sublandlord's contractor, if so requested
by Sublandlord), for their reasonable approval, which schedule shall detail the
timing and purpose of Subtenant's entry.  Subtenant shall hold Sublandlord
harmless from and indemnify and protect and defend Sublandlord against any loss
or damage to the Premises or the Building and against injury to any person
caused by Subtenant's actions as a result of such entry, to the extent such loss
or damage is not covered by insurance carried or required to be carried under
this Sublease.

                                  ARTICLE III

                                      RENT

     3.1  Monthly Fixed Rent.  Subtenant shall pay Sublandlord the Monthly Fixed
          ------------------
Rent in advance on the first calendar day of each month included in the Term,
commencing on the Rent Commencement Date; and for any portion of a calendar
month at the beginning of or end of the Term, the corresponding fraction of the
Monthly Fixed Rent in advance.  Monthly Fixed Rent shall include HVAC, nightly
janitorial service, electricity for lights and plugs and one security guard from
4 p.m. to 8a.m. Monday through Friday.

     3.2  Additional Rent.  Pursuant to the Headlease, Sublandlord is required
          ---------------
to pay 100% of all operating, tax, maintenance and repair costs for the Building
(as such terms are defined in the Headlease), and such other amounts payable as
in the Headlease (collectively, the "Operating Costs").  Subtenant shall pay
Sublandlord as additional rent hereunder 14.8% (increasing to 28% on March 1,
2000) of any increase

                                       4
<PAGE>

over the base year of all Operating Costs allocable to the periods of time
included in the Term (the "Additional Rent"). The base year for real estate
taxes is July 1, 1999 through June 30, 2000 with real estate taxes in the amount
of $68,345. The base year for all other operating costs is the 2000 operating
budget with an amount of $6.35 per rentable square foot. Subtenant shall pay
such amount within ten (10) days of billing by Sublandlord, which bills shall
include, where applicable, copies of the applicable statements from
Headlandlord. Any surplus shall be promptly refunded to Subtenant and any
deficit in such payment shall be promptly paid by Subtenant after the
Headlandlord finally determines the amounts payable by the Sublandlord under the
Headlease.

Capital repairs and replacements to the roof, structural elements and Building
systems shall be the sole responsibility of the Sublandlord and shall not be
included in the Operating Costs.

     3.3  Payment.  All payments of Monthly Fixed Rent and Additional Rent shall
          -------
be made to Sublandlord at Sublandlord's Address set forth in Section 1.1 or to
such other address as Sublandlord may designate by notice to Subtenant from time
to time.

                                   ARTICLE IV

                             SUBTENANT'S COVENANTS

     Subtenant covenants during the Term and such further time as Subtenant
occupies any part of the Premises:

     4.1  Subtenant's Payments.  Subtenant shall pay all Monthly Fixed Rent,
          --------------------
Additional Rent and any other amounts payable when due.

     4.2  Maintenance and Repair.  Subtenant shall maintain the Premises in the
          ----------------------
condition required by the Headlease.

     4.3  Occupancy and Use.  Subtenant shall not use the Premises for any uses
          -----------------
other than the Permitted Uses, and shall not make any use of the Premises which
is prohibited by any applicable law, ordinance, code, regulation, license,
permit, variances or governmental order.

     4.4  Alterations and Additions.  Subtenant shall not make any improvements,
          -------------------------
repairs, alterations, replacements, decorations and/or additions to the Premises
without first obtaining the written approval of Sublandlord, which approval
shall not be unreasonably withheld or delayed, and the written approval of the
Headlandlord on the terms and conditions set forth in the Headlease.

                                       5
<PAGE>

     All construction work required or permitted by this Sublease shall be done
in a good and workmanlike manner and in compliance with all applicable laws and
all lawful ordinances, regulations and orders of governmental authority and
insurers of the building.

     4.5  Assignment and Subletting.  Except with Sublandlord's prior written
          -------------------------
consent, which consent shall not be unreasonably withheld or delayed, Subtenant
shall not assign, transfer, mortgage or pledge this Sublease, or sublease (which
term shall be deemed to include the granting of concessions and licenses and the
like) all or any part of the Premises, or suffer or permit this Sublease or the
leasehold estate hereby created or any other rights arising under this Sublease
to be assigned, transferred or encumbered, in whole or in part, whether
voluntarily, involuntarily or by operation of law, or permit the occupancy of
the Premises by anyone other than Subtenant.  Any attempted assignment,
transfer, mortgage, pledge, sublease or encumbrance without such consent shall
be void.

In the event that any assignee or transferee of Subtenant pays to Subtenant any
amount in excess of the Monthly Fixed Rent, Additional Rent and any amounts
and/or charges then payable hereunder, Subtenant shall promptly pay one hundred
(100%) percent of said excess to Sublandlord as and when received by Subtenant.
If Subtenant shall receive from any assignee or transferee, either directly or
indirectly, any consideration for the assignment of this Sublease, either in the
form of cash, goods or services, Subtenant shall pay an amount equivalent to one
hundred (100%) percent of such consideration to Sublandlord as and when received
by Subtenant.

Notwithstanding the foregoing, any assignment, transfer, mortgage or pledge of
this Sublease is subject to and conditioned upon receipt of the prior written
consent of the Headlandlord as provided in the Headlease.

No assignment or subletting shall affect the continuing primary liability of
Subtenant (which, following assignment, shall be joint and several with the
assignee).

     4.6  Indemnification.  Subtenant shall indemnify Sublandlord and hold
          ---------------
Sublandlord harmless from and against any and all claims, demands, suits,
judgments, liabilities, costs and expenses, including reasonable attorneys'
fees, arising out of or in connection with Subtenant's use and possession of the
Premises and the exercise room, or arising out of the failure of Subtenant, its
agents, contractors or employees to perform any covenant, term or condition of
this Sublease or of the Headlease to be performed by Subtenant hereunder.
Sublandlord agrees to indemnify and hold Subtenant harmless from and against any
and all claims, demands, suits, judgments, liabilities, costs and expenses,
including reasonable attorneys' fees, arising out of the failure of Sublandlord,
its agents, contractors or employees to perform any covenant, term or condition
of this Sublease or of the Headlease to be performed by Sublandlord hereunder.

                                       6
<PAGE>

     4.7  Insurance.  Subtenant shall maintain in responsible companies with a
          ----------
general policy rating of A or better and a financial class of VI or better by
A.M. Best, Inc. and qualified to do business and in good standing in
Massachusetts, comprehensive general liability insurance covering the premises
insuring Sublandlord and Headlandlord as well as Subtenant with limits which
shall, at the commencement of the Term, be at least $2,000,000 and from time to
time during the Term shall be for such higher limits, if any, as are customarily
carried in the Marlborough and Westboro areas with respect to similar properties
and worker's compensation insurance with statutory limits covering all of
Subtenant's employees working in the Premises.  In addition, Subtenant shall be
responsible for insuring its personal property.  Subtenant shall deposit
promptly with Sublandlord certificates for such insurance naming Sublandlord and
Headlandlord as additional insureds, and all renewals thereof bearing the
endorsement that the policies will not be canceled until after 30 days' written
notice to Sublandlord.

                                   ARTICLE V

                              CASUALTY AND TAKING

     5.1  Termination of Headlease.  In the event that during the Term, all or
          ------------------------
any part of the Premises or the Headleased Premises are destroyed or damaged by
fire or other casualty or taken by eminent domain, and either Sublandlord or
Headlandlord terminates the Headlease pursuant to its terms because of such
damage, destruction or taking, then this Sublease shall likewise terminate on
the same date that the Headlease terminates.  Sublandlord shall give Subtenant
prompt notice of such termination and the date on which it shall occur.

     5.2  Repair and Restoration.  In the event any such damage, destruction or
          -----------------------
taking of the Premises occurs and this Sublease is not terminated pursuant to
Section 5.1 above, then Sublandlord shall use reasonable efforts to cause
Headlandlord to repair and restore the Premises to the extent required by the
terms of the Headlease.

     5.3  Reservation of Award.  Any and all rights to receive awards made for
          --------------------
damages to the Premises and the leasehold hereby created accruing by reason of
exercise of eminent domain or by reason of anything lawfully done in pursuance
of public or other authority, are reserved to Sublandlord and Headlandlord.
Subtenant hereby releases and assigns to Sublandlord and Headlandlord all
Subtenant's rights to such award and covenants to deliver such further
assignments and assurances thereof as Sublandlord or Headlandlord may from time
to time request.

                                       7
<PAGE>

                                   ARTICLE VI

                                   HEADLEASE

     6.1  Sublease Subject to Headlease.  This Sublease is subject to the
          -----------------------------
Headlease.  Subject to this Section 6.1, all terms and conditions of the
Headlease are incorporated into and made a part of this Sublease as if
Sublandlord were the landlord thereunder and Subtenant were the tenant.  In case
of conflict between the incorporated provisions of the Headlease and the
remaining provisions of this Sublease, the latter shall control.  Subtenant
assumes and agrees to perform the tenant's obligations under the Headlease
during the Term, except that the obligation to pay rent or other amounts to
Headlandlord under the Headlease shall not be an obligation of Subtenant, and
Subtenant shall instead pay the rent under this Sublease.  Subtenant shall not
commit or suffer any act or omission that will violate any of the provisions of
the Headlease.

          If the Headlease terminates as a result of a default or breach of
Subtenant under this Sublease and/or the Headlease, then the Subtenant shall be
liable to the Sublandlord for the direct damage suffered as a result of such
termination.  Subtenant covenants not to commit or suffer any act or omission
that will violate the Headlease.

     6.2  Excluded Obligations.  Notwithstanding anything to the contrary
          --------------------
herein, the incorporated provisions of the Headlease are amended or qualified as
follows:

     i.   Sublandlord shall not be liable under any circumstances for a loss of
or injury to property, or interference with Subtenant's business, however
occurring, incidental to any failure to furnish any utilities or services.

     ii.  Sublandlord shall have no responsibility to perform or construct (or
to pay the cost of performing or constructing) any repair, maintenance or
improvement in or to the Premises, except as specifically set forth in Section
2.1 of this Sublease.

     iii. Rent shall be abated under this Sublease only to the extent that
Sublandlord receives a corresponding rent abatement under the Headlease.

     iv.  Wherever the Headlease grants to Sublandlord a grace or cure period,
the corresponding grace or cure period under this Sublease shall be two (2)
business days shorter in duration.

     The parties acknowledge that Sublandlord's ability to satisfy certain of
its obligations to Subtenant under this Sublease is contingent upon the full and
timely performance of Headlandlord's obligations under the Headlease.  The
parties further acknowledge that, while Sublandlord will use reasonable efforts
to cause Headlandlord to perform its obligations under the Headlease,
Sublandlord will not be liable to Subtenant for any breach of Sublandlord's
obligations under this Sublease, nor shall such breach diminish Sublandlord's
rights hereunder, where the same is caused by or attributable to the failure of
Headlandlord to perform its obligations under the Headlease.

                                       8
<PAGE>

     6.3  Headlandlord's Rights.  Headlandlord shall have all rights with
          ---------------------
respect to the Premises which it has reserved to itself as landlord under the
Headlease.

     6.4  Termination of Headlease.  In the event that Headlandlord terminates
          ------------------------
the Headlease pursuant to its terms or the Headlease otherwise terminates or
expires, this Sublease shall likewise and simultaneously terminate.

                                  ARTICLE VII

                                 MISCELLANEOUS

     7.1  Notices from One Party to the Other.  All notices required or
          -----------------------------------
permitted hereunder shall be in writing, duly signed by the party giving such
notice and transmitted by prepaid registered or certified mail, return receipt
requested, by telegram or telefax, or delivered by hand, and addressed as
follows:

     to Sublandlord:   Banyan Systems Incorporated
                       120 Flanders Road
                       Westboro, MA 01581
                       Fax No. (508) 366-6846
                       Attn: Legal Department

     to Subtenant:     Switchboard Incorporated
                       115 Flanders Road
                       Westboro, MA 01581
                       Fax No. (508) 870-2000
                       Attn:  John P. Jewett

or to such other address as Sublandlord or Subtenant shall designate by written
notice to each other.  Any notice shall be deemed duly given on the second
business day following the date of mailing, or when delivered to such address by
hand, or if transmitted by telefax or telegram, on the business day received.

     7.2  Estoppel Certificate.  Upon not less than twenty (20) days prior
          --------------------
notice by the requesting party, either party shall execute, acknowledge and
deliver to the other a statement in writing, addressed to such person as the
requesting party shall designate, certifying (a) that this Sublease is
unmodified and in full force and effect, (b) the dates to which Monthly Fixed
Rent, Additional Rent have been paid, and (c) that the requesting party is not
in default hereunder (or, if in default, specifying the nature of such default
in reasonable detail).  Any such certificate may be relied upon by the person to
which it is addressed as to the facts stated therein.

                                       9
<PAGE>

     7.3  Brokerage.  Subtenant and Sublandlord mutually represent and warrant
          ---------
that they have dealt with no broker in connection with this transaction.  Each
agrees to defend, indemnify and save the other harmless from and against any and
all cost, expense or liability for any compensation, commissions or charges
claimed by any broker or agent, with respect to the indemnifying party's
dealings in connection with this Sublease.

     7.4  Applicable Law.  This Sublease shall be governed by and construed in
          --------------
accordance with the laws of the Commonwealth of Massachusetts.

     7.5  Security Deposit.  Upon execution of this Sublease, Subtenant shall
          ----------------
deliver to Sublandlord the Security Deposit, such sum to be held by Sublandlord
as security for the performance of Subtenant's obligations under this Sublease.
The Security Deposit shall be held by Sublandlord without interest and
Sublandlord shall be entitled to commingle the Security Deposit with its other
funds.

     7.6  Construction.  If any term, covenant, condition or provision of this
          ------------
Sublease or the application thereof to any person or circumstances shall be
declared invalid or unenforceable by the final ruling of a court of competent
jurisdiction having final review, the remaining terms, covenants, conditions and
provisions of this Sublease and their application to persons or circumstances
shall not be affected thereby and shall continue to be enforced and recognized
as valid agreements of the parties.

     This Sublease constitutes the entire agreement between the parties hereto
with respect to the transactions contemplated herein, and it supersedes all
prior discussions, understandings or agreements, including without limitation
the Offer To Sublease, between the parties.

     There are no oral or written agreements between Sublandlord and Subtenant
affecting this Sublease.  This Sublease may be amended, and the provisions
hereof may be waived or modified, only by instruments in writing executed by
Sublandlord and Subtenant.

     The titles of the several Articles and Sections contained herein are for
convenience only and shall not be considered in construing this Sublease.

     Unless repugnant to the context, the words "Sublandlord" and "Subtenant"
appearing in this Sublease shall be construed to mean those named above and
their respective heirs, executors, administrators, successor and assigns, and
those claiming through or under them respectively.  If there be more than one
tenant, the obligations imposed by this Sublease upon Subtenant shall be joint
and several.

     7.7  Right of First Offer for Second Floor on 120 Flanders Road. Provided
          ----------------------------------------------------------
that Subtenant is not in default in the performance or observance of any of the
terms and

                                       10
<PAGE>

provisions of this Sublease or the Headlease, if Sublandlord intends during the
Term of this Sublease, to market the Second Floor Space of 120 Flanders Road
consisting of approximately 18,111 rentable square feet when it becomes
available for leasing (the "Second Floor Space"), then Sublandlord will present
a term sheet (the "Offer") for the leasing of the Second Floor Space to
Subtenant. Except as otherwise set forth in the Offer, the lease of the Second
Floor Space shall be on the terms and conditions set forth in this Sublease.

Upon its receipt of the Offer, Subtenant shall have seven (7) business days to
accept or reject the Offer.  If Subtenant accepts the Offer within said seven
day period, Sublandlord and Subtenant shall execute a lease for such Second
Floor Space on the terms set forth in the Offer within thirty (30) days of
Subtenant's acceptance of the Offer.  In the event Subtenant does not accept the
Offer within said seven day period or Sublandlord and Subtenant do not execute a
lease on the terms set forth in the Offer within said thirty day period, then
Sublandlord shall have the right to lease the Second Floor Space on terms which
Sublandlord reasonably determines to be at least 90% as economically beneficial
to Sublandlord as those set forth in the Offer without reoffering the Second
Floor Space to Subtenant.  If (i) Sublandlord wishes to lease the Second Floor
Space on terms less than 90% as economically beneficial to Sublandlord, or (ii)
Sublandlord does not enter into a lease for the Second Floor Space within 180
days of the submission of the Offer to Subtenant, then the Second Floor Space
shall first be subject to re-submission to Subtenant pursuant to the terms of
this Section prior to Sublandlord's leasing of the same.

In the event Subtenant accepts the Offer to lease the Second Floor Space,
Subtenant shall be solely responsible for any and all costs associated with
relocating or moving Subtenant from the Premises to the Second Floor Space.

     7.8  Access and Security.  Normal Building hours shall be from 7:00 a.m. to
          -------------------
6:00 p.m. Monday through Friday.  The Building has a twenty-four (24) hour card
access system.  Subtenant shall be responsible for its own security card access
at the entrance to the Premises.

     7.9  Cafeteria.  Subtenant shall have the right to use the cafeteria at 120
          ---------
Flanders Road during the Term of this Sublease.

     7.10 Option to Extend.  Subtenant shall have the right and option to extend
          ----------------
the Term for an additional two (2) years and nine (9) months until September 30,
2005 (the "Extension Term") commencing upon the expiration of the original Term
referred to in Section 2.2 (the "Original Term"), provided that Subtenant shall
give Sublandlord notice of Subtenant's irrevocable exercise of such option at
least ninety (90) days prior to the expiration of the Original Term and provided
further that Subtenant shall not be in default at either the time of giving such
notice or at the time of the commencement of the Extension Term in the
performance or observance of any of the terms and

                                       11
<PAGE>

provisions of this Sublease on the part of Subtenant to be performed or
observed. Prior to the exercise by Subtenant of such option, the expression
"Term" shall mean the Original Term, and after the exercise by Subtenant of such
option, the expression "Term" shall mean the Original Term as it has been
extended by the Extension Term. Except as expressly otherwise provided in the
following paragraph, all the terms, covenants, conditions, provisions and
agreements in the Sublease contained shall be applicable to the Extension Term.
If Subtenant shall give notice of its exercise of such option to extend in the
manner and within the time period provided aforesaid, the Term shall be extended
upon the giving of such notice without the requirement of any further action on
the part of either Subtenant or Sublandlord. If Subtenant shall fail to give
timely notice of the exercise of such option as aforesaid, Subtenant shall have
no right to extend the Term of this Sublease, time being of the essence of the
foregoing provisions.

The Monthly Fixed Rent payable during the Extension Term shall be the greater of
(i) the Monthly Fixed Rent in effect for the year immediately preceding the
commencement of the Extension Term or (ii) the Fair Market Rent for the
Premises, as determined below, as of the commencement of the Extension Term.  If
for any reason the Monthly Fixed Rent payable during the Extension Term has not
been determined as of the commencement of the Extension Term, Subtenant shall
pay the Monthly Fixed Rent payable during the immediately preceding year until
the Monthly Fixed Rent for the Extension Term is determined, at which time, an
appropriate adjustment, if any, shall be made.

For purposes hereof, the Fair Market Rent shall mean the fair rent for the
Premises as of the commencement of the Extension Term under market conditions
then existing.  Fair Market Rent shall be determined by agreement between
Sublandlord and Subtenant, but if Sublandlord and Subtenant are unable to agree
upon the Fair Market Rent at least two (2) months prior to the date upon which
the Fair Market Rent is to take effect, then the Fair Market Rent shall be
determined by appraisal made as hereinafter provided by a board of three (3)
reputable independent commercial real estate consultants, appraisers, or
brokers, each of whom shall have at least ten (10) years of experience in the
Westboro office rental market and each of whom is hereinafter referred to as
"Appraiser".  Subtenant and Sublandlord shall each appoint one such Appraiser
and the two (2) Appraisers so appointed shall appoint the third Appraiser.  The
cost and expenses of each Appraiser appointed separately by Subtenant and
Sublandlord shall be borne by the party who appointed the Appraiser.  The cost
and expense of the Third Appraiser shall be shared equally by Subtenant and
Sublandlord.  Sublandlord and Subtenant shall appoint their respective
Appraisers at least fifty-five (55) days prior to commencement of the Extension
Term and shall designate the Appraisers so appointed by notice to the other
party.  The two Appraisers so appointed and designated shall appoint the third
Appraiser at least forty-five (45) days prior to the commencement of the
Extension Term and shall designate such Appraiser by notice to Sublandlord and
Subtenant.  The board of three (3) Appraisers shall determine the Fair Market
Rent of

                                       12
<PAGE>

the Premises as of the commencement of the Extension Term and shall notify
Sublandlord and Subtenant of their determinations at least thirty (30) days
prior to the commencement of the Extension Term. If the determination of the
Fair Market Rent of any two (2) or all three (3) Appraisers shall be identical
in amount, said amount shall be deemed to be the Fair Market Rent of the
Premises. If the determination of all three (3) Appraisers shall be different in
amount, the average of the two (2) values nearest in amount shall be deemed the
Fair Market Rent of the Premises. The Fair Market Rent of the Premises
determined in accordance with the provisions of this Section shall be binding
and conclusive on Subtenant and Sublandlord.

     7.11 Consent of Headlandlord.  Subtenant acknowledges that this Sublease is
          -----------------------
subject to the consent of the Headlandlord.  Within three (3) business days
after the execution of this Sublease, Sublandlord shall notify and forward an
originally executed copy of this Sublease to the Headlandlord and shall request
Headlandlord's consent thereto.  Upon receiving Headlandlord's response,
Sublandlord shall notify Subtenant as to whether or not the Headlandlord
consented to the sublease.  In the event the Headlandlord does not consent to
the sublease, this Sublease shall terminate and be of no further force or
effect.

     THIS SUBLEASE is executed as a sealed instrument in two or more
counterparts on the day and year first above written.

     SUBLANDLORD:

     BANYAN SYSTEMS INCORPORATED

     By:  _____________________________
          Name:
          Title:

     SUBTENANT:

     SWITCHBOARD INCORPORATED

     By:  ____________________________
          Name:
          Title:

                                       13<PAGE>

                                                                   Exhibit 10.28
                                                                   -------------

                                             October 8, 1999

Mr. Douglas J. Greenlaw
25 Collins Creek
Greenville, SC  29607

Dear Doug:

It is my pleasure to offer you the position of Chief Executive Officer of
Switchboard Incorporated ("Switchboard" or "Company") reporting to me. The
Executive Team and I believe your expertise will contribute significantly to
Switchboard's ability to attain our goals and realize its full potential.

The following items comprise the details of the offer.

A.   Compensation
     ------------

     The base salary will be $8,653.85 byweekly, or $225,000 annually.

B.   Executive Bonus
     ---------------

     You will be eligible to participate in an Executive Performance Bonus Plan
     that is targeted at an annualized rate of $75,000 and will be prorated from
     your date of hire. The major portion of this bonus will be paid quarterly
     based on quarterly goal achievement with the balance paid based on annual
     performance against goals at year end. Incentive Bonus Plan will be based
     upon a combination of Company performance and your achievement of your
     individual objectives and will be discussed and defined with you during
     your first 60 days of employment.

C.   Equity
     ------

     Nonstatutory Stock Options
     --------------------------

     .    You will receive 900,000 total shares of Switchboard Incorporated at
          an option price of $9.00 per share which will vest in accordance with
          the following schedule:

     .    100,000 non-qualified stock options will vest upon the successful
          completion of an Initial Public Offering of Switchboard Inc.

     .    300,000 non-qualified stock options will vest in equal installments of
          150,000 shares each after years one and two of your employment.

     .    150,000 non-qualified stock options will vest when the Switchboard
          market capitalization equals or exceeds $1.0 billion for 90
          consecutive days or after year three of your employment.
<PAGE>

Mr. Douglas J. Greenlaw                Page 2                   October 8, 1999

     .    150,000 non-qualified stock options will vest when the Switchboard
          market capitalization equals or exceeds $1.5 billion for 90
          consecutive days or after year four of your employment.

     .    200,000 non-qualified stock options will vest when the Switchboard
          market capitalization equals or exceeds $2.0 billion for 180
          consecutive days or after year five of your employment.

D.   Change in Control Provisions
     ----------------------------

     .    In the event of a Change in Control, (defined below), (a) each
          outstanding option to purchase shares of Common Stock of the Company
          held by you shall become immediately exercisable as to 50% of the then
          unvested shares subject to such option, with such immediate vesting
          applied ratably to the unvested shares.

     .    One year after a Change in Control, (a) each outstanding option to
          purchase shares of Common Stock of the Company held by you shall
          become immediately exercisable as to 100% of the then unvested shares
          subject to such option.

     .    If terminated by the Company within 12 months of a Change in Control
          or if your position, title, or responsibilities are materially reduced
          from those in effect immediately prior to a Change in Control, (a)
          each outstanding option to purchase shares of common Stock of the
          Company held by you shall become immediately exercisable as to 100% of
          the then unvested shares subject to such option.

All items in this agreement pertaining to Stock Options of the Company are
subject to the terms and conditions set forth in the Switchboard Incorporated
1996 Stock Incentive Plan.

E.   Benefits
     --------

     You will be eligible for group medical, dental, disability and life
     insurance through the Company.  Coverage for you and your dependents will
     commence on your first day of employment, subject to any insurers'
     eligibility requirements and the payment of any applicable employee
     contributions.

F.   Protection in the Event of Termination
     --------------------------------------

     If your employment is terminated by Switchboard for any reason, except For
     Cause, the Company will provide you with the following payments and
     benefits:

     .    Switchboard will pay you on a biweekly basis your base salary and
          bonus earned for a period of six months from the effective date of
          your termination.

     .    Switchboard will provide up to six months of continued medical and
          dental insurance coverage for you and your family from the effective
          date of your termination, on terms substantially as in effect on the
          date of termination, subject to the payment by you of any applicable
          employee contributions.
<PAGE>

Mr. Douglas J. Greenlaw                Page 3                   October 8, 1999

G.   Other
     -----

     You will receive individual term left insurance equal to five (5) times
     your annual base salary at no cost to you, subject to any insurer's
     eligibility requirements.

     For purposes of this letter, the following terms shall have the following
     respective meanings:

     (1)  Termination of employment for cause ("For Cause") shall mean
          termination by reason of (a) any act or omission involving dishonesty,
          gross negligence or serious misconduct, or (b) your conviction of, or
          the entry of a pleading guilty or nolo contendere by you to, any crime
          involving sexual harassment or any felony.

          Termination of employment For Cause will be presented in writing,
          accompanied by a written statement of reasons. A process of binding
          arbitration will resolve disagreements.

     (2)  A change in control ("Change in Control") of the Company shall be
          deemed to occur if and only if (a) any person or entity (other than
          the Company, any trustee or other fiduciary holding securities under
          an employee benefit plan of the Company, or any corporation owned
          directly or indirectly by the stockholders of the Company is
          substantially the same proportion as their ownership of stock of the
          Company) is or becomes the "beneficial owner" (as defined in Rule 13d-
          3 under the Securities and Exchange of 1934, as amended), directly or
          indirectly, of securities of the Company representing more than 50% of
          the combined voting power of the Company's then outstanding voting
          securities (b) a merger or consolidation of the Company following
          which the voting securities of the Company outstanding immediately
          prior thereto do not continue to represent more than 50% of the
          combined voting power of the voting securities of the Company or the
          entity outstanding immediately after such merger or consolidation, or
          (c) a sale of all or substantially all of the assets of the Company.

H.   Contract Term
     -------------

     This contract is valid for the duration of your employment subject to a 60-
     day notice period of cancellation by either party.

Please confirm your acceptance of this offer for employment by signing this
letter and providing your smart date where indicated below, and by signing the
enclosed Employee Patent and Confidential Information Agreement.  Please return
both documents to me at your earliest convenience.

In addition, you will be required to provide proof of eligibility to work in the
United States per federal legislation.  A listing of required documentation
(Form I-9) is also enclosed.

Per our earlier discussion and as outlined in your Offer Summary, employment
with Switchboard is contingent upon you and the CBS representatives(s) of
Switchboard mutually agreeing to a positive and collaborative working
arrangement.
<PAGE>

Mr. Douglas J. Greenlaw                Page 4                   October 8, 1999

Doug, I look forward with great expectation to you joining our Executive team
and leading Switchboard.  I am confident you will be highly successful.

                              Sincerely,

                                /s/ William P. Ferry
                              -----------------------------------
                              William P. Ferry
                              Chairman

cc:  Anthony J. Bellantuoni, Vice President of Human Resources, Banyan Worldwide

Attachments:  Employee Patent and Confidential Information Agreement
              Form I-9

Accepted:

  /s/ Douglas J. Greenlaw                    10-18-99
--------------------------------            ------------------------------
Douglas J. Greenlaw                         Start Date

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