Document:

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                                                                 Exhibit 10.10

                               SUBLEASE AGREEMENT

     This Sublease Agreement (this "Sublease"), dated as of October 6, 2005, is
entered into by and between: Light Sciences Corporation, a Washington
corporation ("LSC"), and Light Sciences Oncology, Inc., a Washington corporation
("LSO").

                                    RECITALS

     A. LSC is the subtenant under that certain Sublease Agreement dated
September 9, 2002, between Microsoft, Inc., a Washington corporation (formerly
Great Plains Software O.C., Inc.) ("Sublandlord") and LSC (the "Master
Sublease"), under which LSC leases office space located at 34931 S.E. Douglas
Street, Suite 200, Snoqualmie, WA 98065 (the "Premises"). The Master Sublease is
attached to this Sublease as Schedule A. The Premises are more fully identified
and legally described in the Master Sublease.

     B. Sublandlord is the tenant under that certain Lease dated as of March 2,
2000, between Snoqualmie Ridge Cascade View LLC, a Washington limited liability
company ("Master Landlord") and Sublandlord ("Master Lease"), under which
Sublandlord leases the Premises. The Master Lease is attached to this Sublease
as Schedule B.

     C. LSC desires to sublease office space measuring approximately 6003 square
feet, shown cross-hatched on attached Schedule C (the "Subleased Premises") to
LSO and to share the right to use all other rooms and areas not occupied as
offices by staff of LSC or others (collectively, the "Shared Areas"), and LSO
desires to sublease such Subleased Premises from LSC and share the right to use
the Shared Areas, all subject to the terms and conditions of this Sublease.

                                    AGREEMENT

     NOW, THEREFORE, LSC and LSO agree as follows:

SECTION 1. SUBLEASED PREMISES AND SHARED AREAS. Subject to the terms and
conditions of this Sublease, LSC hereby subleases the Subleased Premises to LSO,
and LSO hereby subleases the Subleased Premises from LSC. In addition, LSC
grants LSO the right to use and access the Shared Areas and any and all
furniture, fixtures and equipment in the Shared Areas and the same rights of
ingress and egress to the Subleased Premises and Shared Areas as LSC has under
the Master Sublease. The shared equipment, includes, without limitation, the
equipment listed in attached Schedule D ("Designated Shared Equipment"). Without
limiting the foregoing, LSO will have the right to use for regular ingress and
egress the stairwell that is currently used as an emergency exit from the
Subleased Premises. LSC will deliver LSO possession of the Subleased Premises on
the date of this Sublease. LSO will have access to the Subleased Premises and
Shared Areas seven (7) days a week, twenty-four (24) hours a day, every day of
the year, subject to any restrictions set forth in the Master Lease or Master
Sublease. LSO will be entitled to display reasonable signage for the Subleased
Premises, including, without limitation, signage on the door to the Subleased
Premises, to the extent permitted under the Master Lease and Master Sublease.

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SECTION 2. SERVICES. During the Term (as defined below), LSC will provide the
following services to LSO for the normal use of the Subleased Premises and
Shared Areas:

          (a) electricity, gas and utilities;

          (b) heat, ventilation and air conditioning;

          (c) telephone and data;

          (d) janitorial services;

          (e) maintenance and repair services necessary to maintain the
Subleased Premises and Shared Areas in good working order and in a safe
condition;

          (f) maintenance and repair of all equipment, fixtures and furniture
used in the Shared Areas; and

          (g) a reasonable number of unreserved parking spaces.

     LSC will perform or cause to be performed the foregoing services in a
professional and workmanlike manner and with at least the same quality,
timeliness and efficiency as LSC performs or causes to be performed similar
services in the operation of its own business.

SECTION 3. TERM AND TERMINATION

     3.1 TERM. The term of this Sublease will commence on the date of this
Sublease and will end upon the termination or expiration of the Master Sublease,
unless sooner terminated in accordance with Section 3.2, 3.3 or 3.4 (the
"Term").

     3.2 TERMINATION BY LSO. LSO may terminate the Term upon one hundred twenty
(120) days' written notice; provided, that LSO may terminate the Term upon
written notice if LSC breaches any of its obligations under this Sublease, and
such breach continues for twenty (20) days after written notice from LSO.

     3.3 TERMINATION BY LSC. LSC may terminate the Term upon written notice if
LSO fails to pay any Rent or other amounts payable hereunder when due, and such
failure continues for ten (10) days after written notice from LSC, or LSO
otherwise breaches its obligations under this Sublease, and such breach
continues for twenty (20) days after written notice from LSC.

     3.4 TERMINATION OF MASTER LEASE OR MASTER SUBLEASE. This Sublease will
terminate if the Master Lease or Master Sublease terminates or is terminated for
any reason.

     3.5 SURRENDER OF SUBLEASED PREMISES. LSO will, on or before the last day of
the Term, remove all of its furniture, furnishings, personal property and
equipment and surrender the Subleased Premises.

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SECTION 4. COMPENSATION

     4.1 RENT. LSO will pay to LSC rent on a monthly basis ("Rent") calculated
as follows:

          (a) for the Subleased Premises, LSO will pay an amount equal to

               (i) the rent payable by LSC under Section 3.1 and 3.2 of the
Master Sublease multiplied by

               (ii) the ratio of the rentable square footage of the Subleased
Premises to the rentable square footage of the Premises; and

          (b) for the Shared Areas, LSO will pay an amount equal to

               (i) the rent payable by LSC under Section 3.1 and 3.2 of the
Master Sublease multiplied by the ratio of the rentable square footage of the
Shared Areas to the rentable square footage of the Premises multiplied by

               (ii) the ratio of the rentable square footage of the (x)
Subleased Premises to the (y) rentable square footage of the Subleased Premises
and the portion of the Premises used exclusively by any person or entity other
than LSO.

Rent will be paid in advance on the first day of each calendar month at such
place as LSC may designate, without prior demand therefor. Those portions of
Rent paid under this Section 4.1 attributable to "Additional Rent" payable by
LSC under the Master Sublease will be reconciled in accordance with Section 3.2
of the Master Sublease. If this Sublease does not commence or terminate on the
first or last day of a calendar month, Rent for the month of commencement or
termination will be prorated.

     4.2 ADDITIONAL RENT. In the event LSC incurs costs to provide services
described in Section 2 that are not provided by the Master Landlord or
Sublandlord, then LSO will pay to LSC the actual costs incurred by LSC to
provide such services to LSO allocated to LSO in the same manner that rent under
the Master Sublease is allocated to LSO under Section 4.1 ("Additional Rent").
For avoidance of doubt, no additional rent or fees will be payable under this
Section 4.2 for services that are included in the operating expenses charged to
LSC under Section 3.2 of the Master Sublease. On or about the first day of every
calendar month, LSC will submit to LSO a reasonably detailed written invoice for
any Additional Rent for services properly performed during the prior calendar
month. LSO will pay LSC the amounts properly payable under each invoice within
thirty (30) days after receipt.

     4.3 RECORDS. Upon reasonable request, LSC will furnish such information as
LSO may reasonably request to verify any amounts payable hereunder. Further, LSO
will have the right to review and audit LSC's books and records upon reasonable
advance notice to verify the calculation of the amounts payable under this
Section 4.

SECTION 5. USE. The Subleased Premises and Shared Areas will be used and
occupied by LSO only for general purpose use, including, without limitation, dry
and wet laboratory, and research and development. LSC represents that the
Subleased Premises and Shared Areas can be used for such purposes under the
Master Lease and Master Sublease. LSO will observe at all times (a) any and all
rules and regulations promulgated by the Master Landlord that are applicable to
the Subleased Premises and Shared Areas or any occupant thereof; and (b)
commercially reasonable safety and security

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regulations established by LSC in consultation with LSO for the use or occupancy
of the Subleased Premises and Shared Areas.

SECTION 6. LOCKS. LSC will furnish LSO with keys and security cards needed for
access to the Subleased Premises and Shared Areas. Upon termination of the Term,
LSO will surrender all keys and security cards to the Subleased Premises and
Shared Areas. LSO will not change the locks to the Subleased Premises without
the prior written consent of LSC and the Sublandlord. LSC will not unreasonably
withhold its consent to any such change.

SECTION 7. INSURANCE. Unless otherwise agreed upon by the parties, during any
period of occupancy, LSC will keep in full force and effect insurance as
required of LSC under Section 14 of the Master Sublease. During the period of
LSO's occupancy, (a) such insurance will name LSO as an additional insured, (b)
LSC will not cancel such insurance without the prior written consent of LSO, and
(c) upon request, LSC will provide certificates to LSO evidencing such
insurance. The premiums and related costs for such insurance will be allocated
to LSO in the same manner that rent is allocated to LSO under Section 4.

SECTION 8. MASTER LEASE AND MASTER SUBLEASE

     8.1 ADHERENCE TO MASTER LEASE AND MASTER SUBLEASE. This Sublease is subject
to the terms and conditions of and subordinate to the Master Lease and Master
Sublease. LSO will be bound by all obligations and responsibilities of LSC as
tenant under the Master Sublease and hereby assumes the obligations of LSC
thereunder with respect to the Subleased Premises, except to the extent such
obligations are inconsistent with LSO's obligations under this Sublease or are
addressed by the terms and conditions of this Sublease. LSO will not knowingly
take any actions that will cause LSC to be in default under the Master Sublease
or Sublandlord to be in default under the Master Lease.

     8.2 GOOD STANDING. LSC represents and warrants that (a) the Master Sublease
is in good standing, and, to its knowledge, the Master Lease is in good
standing; (b) there are no agreements other than the Master Sublease and Master
Landlord's Consent to Sublease between LSC and the Sublandlord concerning the
use of the Subleased Premises or Shared Areas; and (c) LSC is not in breach or
default, and has not received notice of any breach or default, under the Master
Sublease, and, to its knowledge, Sublandlord is not in breach or default under
the Master Lease. LSC will immediately notify LSO if LSC receives oral or
written notice from Sublandlord of a breach or default under the Master
Sublease.

     8.3 PERFORMANCE. LSC will perform all of its obligations under the Master
Sublease. LSC will use diligent good faith efforts to cause the Sublandlord to
perform its obligations under the Master Sublease.

     8.4 AMENDMENT; TERMINATION; RENEWAL. LSC will not amend or voluntarily
terminate the Master Sublease, or surrender all or any portion of the Subleased
Premises or Shared Areas, without LSO's prior written consent. At least thirty
(30) days before the first day that LSC has to exercise its option to extend the
term of the Master Sublease, LSC will notify LSO whether LSC will exercise its
option to extend the term of the Master Sublease. If LSC notifies LSO that LSC
will not exercise its option to extend the term of the Master Sublease, then LSC
will cooperate and assist LSO to assume and extend the Master Sublease to enable
LSO to sublease the Subleased Premises and Shared Areas from the Sublandlord. If
LSC notifies LSO that LSC will exercise its option to extend the Master
Sublease, then LSC will timely and properly exercise its option to extend the
term of the Master Sublease.

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SECTION 9. ASSIGNMENT AND SUBLETTING. LSO will not sublet the Subleased Premises
or assign this Sublease or any part thereof for any period of time without the
prior consent of Master Landlord, Sublandlord and LSC. LSC will not assign this
Sublease or any part thereof without the prior consent of LSO. Neither party
will unreasonably delay, withhold or condition its consent.

SECTION 10. INDEMNIFICATION. LSO will indemnify, defend and hold harmless LSC,
Sublandlord and Master Landlord from any claim, liability or suit, including
reasonable attorneys' fees, for any injury or damage occurring in or about the
Subleased Premises or Shared Areas where such damage or injury was caused by any
act, omission, negligence or intentional act of LSO or by LSO's agents,
employees, servants, customers, clients, contractors or invitees. LSC will
indemnify, defend and hold harmless LSO from any claim, liability or suit,
including reasonable attorneys' fees, for any injury or damage occurring in or
about the Subleased Premises or Shared Areas where such damage or injury was
caused by any act, omission, negligence or intentional act of LSC or by LSC's
agents, employees, servants, customers, clients, contractors or invitees. The
indemnification obligations contained in this Section will not be limited by any
worker's compensation, benefit or disability laws, and each indemnifying party
hereby waives (solely for the benefit of the indemnified party) any immunity
that said indemnifying party may have under the Industrial Insurance Act, Title
51 RCW and similar worker's compensation, benefit or disability laws. LSO AND
LSC ACKNOWLEDGE BY THEIR EXECUTION OF THIS SUBLEASE THAT EACH OF THE
INDEMNIFICATION PROVISIONS OF THIS SUBLEASE (SPECIFICALLY INCLUDING BUT NOT
LIMITED TO THOSE RELATING TO WORKER'S COMPENSATION BENEFITS AND LAWS) WERE
SPECIFICALLY NEGOTIATED AND AGREED TO BY LSO AND LSC.

SECTION 11. QUIET ENJOYMENT. Provided LSO has satisfied its obligations under
Section 4, LSO will peaceably and quietly hold and enjoy the Subleased Premises
for the Term.

SECTION 12. CONFIDENTIALITY. Neither party will use the Confidential Information
of the other party or disclose, disseminate, display, publish or distribute any
Confidential Information of the other party to any person or entity without the
prior written consent of the disclosing party. Each party will exercise due care
(i.e., at least as much care as it affords its own confidential information) to
prevent unauthorized disclosure or use of Confidential Information of the
disclosing party. Without limiting the foregoing, the receiving party will make
the Confidential Information of the disclosing party available only to those of
its employees, agents and other representatives who have a need to know the same
for a purpose authorized by the disclosing party, who have been informed that
the Confidential Information belongs to the disclosing party, and who have
agreed or are otherwise obligated to comply with this Section 12. "Confidential
Information" means any trade secrets or other information of a party disclosed
to or learned or acquired by the other party and not generally available to the
public, whether of a technical, business or other nature (including, without
limitation, information relating to a party's research, studies, drugs, clinical
data, products, developments, designs, methods, manufacturing processes,
business plans, finances, personnel, marketing plans, customers, suppliers,
prospects or other affairs). However, Confidential Information does not include
any information that: (a) was known by the receiving party prior to
communication by the disclosing party; (b) is a matter of public knowledge at
the time of such disclosure by the disclosing party; (c) becomes a matter of
public knowledge, without fault on the part of the receiving party, subsequent
to disclosure by the disclosing party to the receiving party; or (d) has been
disclosed to the receiving party from a third party lawfully having possession
of such Confidential Information without an obligation of confidentiality to the
disclosing party. Subparagraph (a) will not apply to Confidential Information
transferred from LSC to LSO under the Asset Transfer Agreement entered into in
connection with this Sublease. Notwithstanding the foregoing restrictions, the
receiving

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party may disclose or produce any Confidential Information of the disclosing
party if and to the extent required by any discovery request, subpoena, court
order, governmental action, or to the extent the receiving party believes in
good faith on the basis of an opinion of counsel that such disclosure is
required by applicable law or regulation; provided, that the receiving party
gives the disclosing party reasonable advance notice of the same (e.g., so as to
afford the disclosing party a reasonable opportunity to appear, object and
obtain a protective order or other appropriate relief regarding such
disclosure).

SECTION 13. MISCELLANEOUS

     13.1 NOTICES. All notices and other communications hereunder will be in
writing and will be deemed given if delivered personally, by fax (receipt
confirmed), or by registered or certified mail, return receipt requested and
postage prepaid or sent by express courier service (receipt verified), to the
parties at the following addresses (or at such other addresses for a party as
will be specified by the like notice; provided, that notices of a change of
address will be effective only upon receipt thereof):

     To LSO: Light Sciences Oncology, Inc.
             34931 SE Douglas Street
             Suite 200
             Snoqualmie, WA 98065
             Attn.: Jay Winship, M.D.
             Fax: ____________________________

     To LSC: Light Sciences Corporation
             34931 SE Douglas Street
             Suite 200
             Snoqualmie, WA 98065
             Attn.: __________________________
             Fax: ____________________________

All such notices and communications will be deemed effective when received.

     13.2. DISPUTE RESOLUTION. Any dispute or claim arising out of or relating
to this Sublease ("Dispute") that cannot be resolved by the parties within ten
(10) days after a party notifies the other party of a Dispute will be referred
to the chief executive officer of LSO and the chief executive officer of LSC. If
the parties' respective chief executive officers do not resolve the Dispute
within ten (10) days after they first discuss the Dispute, then the Dispute will
be settled by binding arbitration in accordance with this Section 13.2. The
arbitration will be conducted by a single arbitrator in accordance with the
rules of the American Arbitration Association. The parties will use their best
efforts to agree upon a mutually acceptable arbitrator within twenty (20) days
after written demand for arbitration under this Section 13.2. The arbitrator's
decision will be in writing, will specify the factual and legal bases of such
decision, will be final and binding on the parties, and a judgment consistent
therewith may be entered by any court of competent jurisdiction. The cost of
arbitration will be borne equally by the parties unless the arbitrator makes a
final determination, which determination will be binding upon the parties, that
one of the parties should be regarded as the prevailing party as to the matters
submitted to the arbitration. Notwithstanding the foregoing, a party may seek
preliminary injunctive or other equitable relief in a court of law if in its
judgment such action is necessary to avoid irreparable damage. The parties will
continue to participate in good faith in the procedures specified in this
Section 13.2 despite such action.

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     13.3 NONWAIVER. The failure of either party to insist on or enforce strict
performance of any provision of this Sublease or to exercise any right or remedy
under this Sublease or applicable law will not be construed as a waiver or
relinquishment to any extent of the right to assert or rely upon any such
provision, right or remedy in that or any other instance; rather, the same will
be and remain in full force and effect.

     13.4 SEVERABILITY. If any provision of this Sublease will be held by any
court of competent jurisdiction to be invalid, illegal or unenforceable under
applicable law, then such provision will be deemed reformed or omitted to the
extent determined by such court (i.e., with the objective of preserving the
intent of such provision to the extent permitted by applicable law). In any
event, the remainder of this Sublease will remain valid and enforceable.

     13.5 GOVERNING LAW. This Sublease will be interpreted, construed and
enforced in all respects in accordance with the laws of the State of Washington,
without reference to its principles relating to conflicts of law.

     13.6 ENTIRE AGREEMENT. This Sublease sets forth the entire agreement and
supersedes any and all prior agreements of the parties with respect to the
subject matter hereof. No amendment of this Sublease will be valid unless set
forth in a written instrument signed by the party to be bound thereby.

     13.7 CONSENT. This Sublease is expressly conditioned upon consent by
Sublandlord and Master Landlord. This Sublease will be of no force or effect
unless consented to by Sublandlord and Master Landlord.

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     IN WITNESS WHEREOF, LSC and LSO have executed this Sublease on the day
first set forth above.

LSO:                                    LSC:

LIGHT SCIENCES ONCOLOGY, INC.           LIGHT SCIENCES CORPORATION

By: /s/ Jay Winship                     By: /s/ Albert Luderer
    ---------------------------------       ------------------------------------
Print: Jay Winship                      Print: Albert Luderer
Its: COO                                Its: CEO

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STATE OF WASHINGTON            )
                               ) ss.
COUNTY OF KING                 )

               I certify that I know or have satisfactory evidence that Jay
Winship is the person who appeared before me, and said person acknowledged that
he/she signed this instrument, on oath stated that he/she was authorized to
execute the instrument, and acknowledged it as the COO of LIGHT SCIENCES
ONCOLOGY, INC., a Washington corporation, to be the free and voluntary act of
such party for the uses and purposes mentioned in the instrument.

        Dated:  September 30, 2005.

(SEAL)

                                    /s/ Diane K. Toomey
                                    -------------------
                                    (Signature of Notary)
                                    Diane K. Toomey
                                    -------------------
                                    (Print or stamp name of Notary)
                                    NOTARY PUBLIC in and for the State of
                                    Washington, residing at: King County.
                                    My appointment expires: 8-12-09.

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                                   SCHEDULE A

                                MASTER SUBLEASE

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                               SUBLEASE AGREEMENT

          This SUBLEASE is made this 9th day of September, 2002 between GREAT
PLAINS SOFTWARE O.C., INC., a Minnesota corporation ("Sublandlord"), and LIGHT
SCIENCES CORPORATION, a Washington corporation ("Subtenant").

          Whereas, Sublandlord is the tenant under that certain lease agreement
dated March 2, 2000, with Snoqualmie Ridge Cascade View LLC, a Washington
limited liability company as landlord ("Landlord") (the "Master Lease"), for
space (the "Master Space") located in the building (the "Building") described
below:

          Name of Building:         Cascade View (Snoqualmie Ridge Business
                                    Park)

          Address:                  34931 S.E. Douglas Street, Suite 200

          City, State and Zip Code: Snoqualmie, WA 98065

          A copy of the Master Lease is attached as Exhibit A.

          The Building, and the land on which the Building is located, and the
common areas in the Building and on the land are referred to collectively as the
Property (the "Property").

          In consideration of the covenants and promises contained in this
Sublease, the parties agree as follows:

     1. Subleased Premises. Sublandlord agrees to sublease to Subtenant, and
Subtenant agrees to sublease from Sublandlord, the entire Master Space as
described in the Master Lease as the "Premises." Sublandlord shall assign all
its right, title and interest to, and Subtenant shall take ownership of, all
existing furniture, the phone system equipment, and network/data equipment
currently in the Premises on an as-is, where-is, basis without warranty of any
kind, express or implied, as itemized on Exhibit B. In addition to use of the
Premises, Subtenant shall have the same rights of ingress and egress to the
Premises, and any common areas and the benefit of any appurtenant easements and
rights of way, all on such conditions and at such times as permitted by Landlord
and granted under the Master Lease.

     2. Term - Option to Renew. This Sublease shall commence on the last to
occur of (a) full execution of this Sublease by the parties and execution of
Landlord's written consent to this Sublease (including the use provision), in
the form attached, and (b) September 1, 2002 ("Commencement Date") and, subject
to sooner termination in accordance with the terms of this Sublease, shall
terminate Sixty Four (64) months after the Commencement Date (the "Term"), which
Term is less than the remaining term under the Master Lease. If Landlord has
failed to deliver its written consent to this Sublease, substantially in the
form attached, by October 1, 2002, either party shall have the right to
terminate this Sublease, by written notice delivered to the other party within
ten (10) days of such date and prior to delivery of Landlord's consent, in which
event this Sublease shall be of no further force and effect.

          If Subtenant is not and has not been in default under this Sublease,
Subtenant shall have the option to extend the Term of this Sublease for one
additional period equal to the remaining term of the Master Lease less two (2)
weeks, by giving Sublandlord written notice thereof not more than twelve (12) or
less than nine (9) months prior to the expiration of the initial Term. The terms
and conditions of the Sublease as extended shall remain the same, except Monthly
Rent, which shall be 95% of the then market Illegible for similar office space
in the Snoqualmie Ridge submarket. Subtenant shall submit to Sublandlord,

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with its notice of option exercise, its proposal for such option period rent. If
Sublandlord disagrees with Subtenant's proposal, it shall provide Subtenant with
a counter proposal within twenty (20) days of receipt of Subtenant's proposal.
If Subtenant disagrees with Sublandlord's counterproposal, it shall so notify
Sublandlord within twenty (20) days of receipt thereof, and the Monthly Rent
shall be determined as follows: Subtenant and Sublandlord shall each, within ten
(10) days after notice from Subtenant, select a real estate agent with at least
ten (10) years experience in the office market which includes the Premises, and
each agent so chosen shall select a third with the same qualifications. The
three so chosen shall determine Monthly Rent for the option term and convey
their decision by written notice to the parties. No explanation, hearing or
court-like proceedings are to be conducted. If the three agents are unable to
agree on rent, the two closest rent determinations shall be averaged and the
third shall be disregarded. The option rent so calculated shall be arrived at no
later than thirty (30) days after the agents are selected. Their determination
shall be final and binding on Sublandlord and Subtenant. Compensation for the
agents shall be divided equally between Subtenant and Sublandlord.

     3. Rent.

          3.1 Monthly Rent. Subtenant agrees to pay Sublandlord monthly rent in
the amount of:

          Commencement Date through December 31, 2002: None

          January 1, 2003 - April 30, 2003:            $9,550.00/month

          May 1, 2003 - September 30, 2003:            $14,883.33/month

          October 1, 2003 thru end of term:            $19,768.50/month

               Plus, monthly rent shall increase by 3.5% per year beginning with
the rent due September 1, 2004 (the "Monthly Rent"). Monthly Rent shall be paid
in advance on the first day of each month without any prior demand, subject to
receipt of an invoice, and without any deduction or offset whatsoever.

          3.2 Additional Rent. Starting on the Commencement Date and during the
Term, in addition to paying the Monthly Rent specified in Section 3.1 above,
Subtenant shall pay all of the "Operating Expenses" (as defined in Section 8 of
the Master Lease) allocated to Sublandlord under the Master Lease. Such payments
by Subtenant, together with any and all other amounts payable by Subtenant to
Sublandlord pursuant to the terms of this Sublease, are hereinafter referred to
as the "Additional Rent." The calculation, payment and reconciliation of the
Additional Rent payments by Subtenant and Sublandlord shall be made in the same
manner as between Landlord and Tenant under Section 8 of the Master Lease.
Sublandlord shall, at Sublandlord's option, credit or refund to Subtenant
Subtenant's Share of any Additional Rent overpayments received by Sublandlord
under the Master Lease, and Subtenant shall pay to Sublandlord any Additional
Rent underpayments prior to the date due from Sublandlord under the Master
Lease. Subtenant shall have the right to Audit Annual Reconciliations to the
extent described by Section 1A.8 of the Master Lease.

               Any and all sums Subtenant is obligated to pay under the terms of
this Sublease shall be construed as rent obligations, in addition to the monthly
rent set forth in this Sublease. In addition, such additional rent shall include
a service charge of One Hundred Dollars ($100.00) for each of Subtenant's
dishonored checks returned by the institution on which said checks are drawn.
If, at any time during the term of this Sublease, Subtenant has tendered payment
by check and Subtenant's bank has returned more than one such payment for any
reason, including insufficient funds, Sublandlord may, at its option, require
that all future payments be made by cashier's check.

     4. Security Deposit. Subtenant has deposited with Sublandlord the sum of
Nineteen Thousand Seven Hundred Sixty Eight and 50/100 Dollars ($19,768.50),
which shall be held by

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Sublandlord as a security deposit for Subtenant's performance of all of the
terms, covenants and conditions of this Sublease (the "Security Deposit"). If
Subtenant defaults under any provision of this Sublease, and if Subtenant fails
to remedy the default within any cure period provided for in section 12 below,
Sublandlord may (but shall not be required to) use, apply or retain all or any
part of this Security Deposit for the payment of any amount Sublandlord may
reasonably spend by reason of Subtenant's default or to compensate Sublandlord
for any loss or damage Sublandlord may suffer because of Subtenant's default.
If, during the term of this Sublease, any portion of the Security Deposit is so
used or applied, Subtenant shall, within ten (10) days after written demand,
deposit cash with Sublandlord in an amount sufficient to restore the Security
Deposit to its original amount. Sublandlord is not required to keep the Security
Deposit separate from its general funds, and Subtenant is not entitled to
interest on the Security Deposit. If Subtenant performs each of its obligations
under this Sublease, the Security Deposit, or any balance thereof, shall be
returned to Subtenant within sixty (60) days after the later of the expiration
of the Sublease term or the date Subtenant vacates the Premises.

     5. Alterations. Sublandlord hereby approves the Alterations set forth on
Exhibit C attached hereto. Subtenant shall not make any other improvements in or
alterations or additions (collectively, "Alterations") to the Premises without
first obtaining Sublandlord's written consent (and any consent required under
the Master Lease) which shall not be unreasonably withheld. All Alterations
shall be at the sole cost and expense of Subtenant and, except to Subtenant's
trade fixtures, furniture and equipment, shall remain in and be surrendered with
the Premises at the termination of this Sublease. However, Sublandlord, in its
sole and absolute discretion, may elect to require Subtenant to remove from the
Premises any or all Alterations upon the termination of the Sublease, and upon
any such election Subtenant shall promptly do so and shall repair all damages
occasioned by such removal and return the Premises to their original condition
to Sublandlord's reasonable satisfaction, all at Subtenant's sole cost and
expense.

          All Alterations undertaken by Subtenant shall be performed by a
contractor approved in advance by Sublandlord, according to plans approved in
advance by Sublandlord. Subtenant shall cause all work to be done in a good and
workmanlike manner using materials equal to or better than those used in the
construction of the Premises and shall comply with or cause compliance with all
laws and with any direction given by any public officer pursuant to law,
including, without limitation, Title III of the Americans with Disabilities Act
of 1990 ("ADA"), as the same are in effect on the date hereof and may be
hereafter modified, amended or supplemented. During construction, Subtenant or
its general contractor shall procure and maintain in effect all insurance
coverages required under the Master Lease and any additional insurance coverage
required by Sublandlord at its sole discretion.

     6. Condition of Premises. Subtenant has thoroughly inspected the Premises
and accepts them in their present condition, AS IS WITH ALL FAULTS. Subtenant
acknowledges that neither Sublandlord nor any agent of Sublandlord has made any
representation as to the condition of the Premises or their suitability for the
conduct of Subtenant's business. Subtenant and Sublandlord expressly agree that
there are and shall be no implied warranties of merchantability, habitability,
fitness for a particular purpose or any other kind arising out of this Sublease.

     7. Landlord's Services. Under the Master Lease Landlord is obligated to
provide Sublandlord with certain operating services, maintenance and repairs
(collectively, "Landlord's Services"). To the extent Landlord's Services apply
to the Premises, Subtenant shall have the benefit of such services. Sublandlord
has no obligation to furnish any of Landlord's Services and will not be liable
for any disruption or failure of such services, except to the extent such
disruption or failure arises from the breach of Sublandlord's enforcement
obligations set forth in the following two sentences. Upon receipt of written
complaint from Subtenant, Sublandlord shall make prompt demand upon Landlord to
take all appropriate action for the correction of any defect, inadequacy or
insufficiency in Landlord's

                                        3

<PAGE>

provision of Landlord's Services. If necessary, upon written request of
Subtenant, Sublandlord shall enforce its rights under the Master Lease to
Landlord's Services for Subtenant's benefit by litigation, in which event
Subtenant shall reimburse Sublandlord for the reasonable costs and expenses of
such enforcement (including reasonable attorneys' fees) to the extent such costs
and expenses are not recovered from Landlord and not caused by Sublandlord's
breach of this Sublease, negligence or willful acts. Subtenant shall be
responsible for all utility costs associated with the Premises, and Sublandlord
shall be responsible for separately metering the utilities to the Premises.

     8. Subtenant's and Sublandlord's Maintenance and Repairs.

          8.1 Maintenance of Premises. Subtenant shall, at its expense, maintain
the Premises, including, without limitation, all improvements to the Premises,
in good order, condition and repair to the same extent required of Sublandlord
under the Master Lease, excepting only reasonable wear and tear.

          8.2. Repair of Building and Common Areas. Except for repairs required
to be made by Landlord under the Master Lease, all repairs to the Property other
than the Premises shall be coordinated by and through Sublandlord. To the extent
the repairs are not paid for from Landlord's insurance, the costs of repair will
be paid in the following manner:

               (a) The Premises. Subtenant shall pay for any repairs conducted
in the Premises.

               (b) The Property Other Than the Premises. Sublandlord shall not
have responsibility for repair or maintenance of the Building or the property of
which the Premises are located. However, to the extent Landlord has such repair
and maintenance obligations under the Lease, upon receipt of a written complaint
from Subtenant, Sublandlord shall make prompt demand upon Landlord to take all
appropriate action to fulfill its repair and maintenance obligations. If
necessary, upon written request of Subtenant, Sublandlord shall enforce its
rights under the Master Lease regarding Landlord's said repair and maintenance
obligations for Subtenant's benefit by litigation, in which event Subtenant
shall reimburse Sublandlord for the reasonable costs and expense of such
enforcement (including reasonable attorneys' fees) to the extent such costs and
expenses are not recovered from Landlord, and not caused by Sublandlord's breach
of this Sublease, negligence or willful acts.

                    Subtenant shall pay for any repairs conducted in the
Property to the extent the damage was caused by Subtenant or an employee, guest,
or agent of Subtenant.

                    Subtenant shall promptly notify Sublandlord of any condition
in the Property that is in need of repair.

     9. Use. Subtenant shall only use the Premises for general office use,
including software development, dry and wet laboratory use, sales and training
and for no other purposes whatsoever. Subtenant shall not do or permit anything
to be done in or about the Property that will in any way interfere with the
rights of Sublandlord or other occupants of the Building, or injure or annoy
them, or use or allow the Property to be used for any improper, immoral,
unlawful or objectionable purpose; nor shall Subtenant cause, maintain or permit
any nuisance in, on or about the Property. Subtenant shall not commit or suffer
to be committed any waste in or about the Property.

     10. Sign Restriction. Subtenant may, at its expense, place its name and
corporate logo on the Premises and Building directory in accordance with and
subject to the terms and conditions of the Master Lease and all applicable law.

                                        4

<PAGE>

     11. Locks. No additional locks shall be placed upon any doors of the
Premises without Sublandlord's consent, which shall not be unreasonably
withheld. Keys and security cards will be furnished to each lock for access to
the Premises at times as permitted by Sublandlord. At the termination of the
Sublease, Subtenant shall surrender to Sublandlord all keys and security cards
to the Premises.

     12. Defaults. Any of the following occurrences shall constitute a default
by Subtenant:

          12.1 Failure to Pay Money When Due. If Subtenant fails to make any
payment of rent, additional security deposit or any other payment required to be
made by Subtenant hereunder, as and when due, for a three (3 day period after
written notice from Sublandlord.

          12.2 Other Breaches. If Subtenant fails to observe or perform any
other provision of this Sublease, including compliance with Landlord's Rules and
Regulations, for a twenty (20) day period after written notice from Sublandlord.
The 20-day grace period shall not apply to Sublandlord's right to exercise
remedies under Section 13(a) only with respect to Subtenant's breach of its
obligations to maintain unexpired insurance coverages in full compliance with
Section 14 of this Sublease.

     13. Remedies. If Subtenant commits a default under this Sublease,
Sublandlord may do any one or more of the following, in addition to pursuing its
remedies under law:

          (a) Cure the default and charge the costs to Subtenant, in which case
Subtenant shall pay such costs as additional rent promptly on demand, together
with interest thereon at the rate of eighteen percent (18%) per year or the
highest rate permitted by law, whichever is less.

          (b) Terminate this Sublease.

          (c) Enter and take possession of the Premises and remove Subtenant and
all other persons and any property from the Premises, with process of law.

          (d) Hold Subtenant liable for and collect rent and other indebtedness
owed by Subtenant to Sublandlord or rent that would have accrued during the
remainder of the term had there been no default, less any sums Subtenant proves
could reasonably have been avoided.

          (e) Hold Subtenant liable for that part of the following sums paid by
Sublandlord that are attributable to the remainder of the term:

               (i) Customary broker's fees incurred by Sublandlord in reletting
part or all of the Premises;

               (ii) The cost of removing and storing Subtenant's property;

               (iii) The reasonable cost of repairs and alterations reasonably
necessary to put the Premises in a condition reasonably acceptable to a new
subtenant for the substantially same use as permitted in the Master Lease or
approved by the Landlord; and

               (iv) Other necessary and reasonable expenses incurred by
Sublandlord in enforcing its remedies.

          Sublandlord shall mitigate its damage by making reasonable efforts to
relet the Premises on reasonable terms. Sublandlord may relet for a shorter or
longer period of time than the Sublease term and make reasonably necessary
repairs and alterations. All sums collected from reletting shall be applied

                                        5

<PAGE>

first to Sublandlord's expenses of reletting described in Section 13(e), and
then to the payment of amounts due from Subtenant to Sublandlord under this
Sublease.

     14. Insurance. Subtenant shall, during any period of occupancy, at its sole
cost and expense, keep in full force and effect the following insurance:

          14.1 Liability Insurance. A policy of general commercial liability
insurance satisfying the requirements of the Master Lease regarding insurance to
be carried by Sublandlord and naming both Sublandlord and Landlord as additional
insureds. Such liability policy shall (a) insure against any and all claims or
liability arising out of the use or maintenance of the Property under this
Sublease, in an amount not less than Three Million Dollars ($3,000,000) per
occurrence covering bodily injury to persons, including death, and damage to
property; (b) insure the hazards of the Property and Subtenant's operations
thereon, independent contractors, contractual liability (covering all indemnity
provisions of this Sublease); and (c) contain a cross-liability provision and a
provision that the insurance provided Sublandlord and Landlord hereunder shall
be primary and non-contributing with any other insurance.

          14.2 Property Damage Insurance. A fire and extended coverage insurance
policy on the improvements to the Premises satisfying the requirements of the
Master Lease regarding insurance to be carried by Sublandlord and naming both
Sublandlord and Landlord as additional insureds as their interests may appear.
Such policy shall (a) be a standard form of property insurance insuring against
the perils of fire, extended coverage, vandalism, malicious mischief, special
extended coverage ("All-Risk") and sprinkler leakage, and (b) be upon all
property owned by Subtenant, or for which Subtenant is legally liable, or that
was installed at Subtenant's expense, and that is located at the Premises,
including, but not limited to, furniture, fittings, installations, fixtures, and
any other personal property of Subtenant, in an amount not less one hundred
percent (100%) of the full replacement cost thereof.

          14.3 General Requirements. All policies shall be written in a form
(including amount of deductibles, if any) satisfactory to Sublandlord and shall
be taken out with insurance companies holding a General Policyholders Rating of
"A" and a Financial Rating of "X" or better, as set forth in the most current
issue of Best's Insurance Reports, but in any event not less than the rating
required under the Master Lease.

               Within ten (10) days after written request from Sublandlord,
Subtenant shall deliver to Sublandlord copies of policies or Certificates of
Insurance complying with this Sublease, in form satisfactory to Sublandlord. No
such policy shall be cancelable or reducible in coverage except after thirty
(30) days prior written notice to Sublandlord. If Subtenant fails to obtain,
maintain and/or provide evidence of insurance required hereunder, Sublandlord
may obtain the same and Subtenant shall, upon demand, reimburse Sublandlord for
the reasonable cost thereof. No such action by Sublandlord or reimbursement from
Subtenant shall be a waiver of default or other remedies. In no event shall the
limits of such policies be considered as limiting liability of Subtenant under
this Sublease.

     15. Waiver of Recovery. Sublandlord and Subtenant each release and relieve
the other, and waive their entire rights of recovery for loss or damage to
property located within or constituting a part or all of the Property to the
extent that the loss or damage is covered by (a) the injured party's insurance,
or (b) the insurance the injured party is required to carry under Section 14,
whichever is greater. This waiver applies whether or not the loss is due to the
negligent acts or omissions of Sublandlord or Subtenant, or their respective
officers, directors, employees, agents, contractors, or invitees. Each of
Sublandlord and Subtenant shall have their respective property insurers endorse
the applicable insurance policies to reflect the foregoing waiver of claims,
provided, however, that the endorsement shall not be required if the applicable
policy of insurance permits the named insured to waive rights of subrogation on
a blanket basis, in which case the blanket waiver shall be acceptable.

                                        6

<PAGE>

     16. Risk. Except as otherwise expressly provided in this Section 16, all of
Subtenant's personal property of any kind or description whatsoever in the
Property shall be at Subtenant's sole risk. Sublandlord and Landlord shall not
be liable for any damage done to or loss of such personal property, injury to
person or damage or loss suffered by the business or occupation of Subtenant
arising from any acts or neglect of co-tenants or other occupants of the
Building, or of any other persons, or from bursting, overflowing or leaking of
water, sewer or steam pipes, or from the heating or plumbing or sprinkler
fixtures, or from electric wires, or from gas, or odors, or caused in any other
manner whatsoever unless and to the extent the damage is caused by the willful
misconduct of Sublandlord or breach of Sublandlord's obligations under this
Sublease or under the Master Lease.

     17. Indemnification. Subject to Section 15 above, Subtenant will defend,
indemnify and hold harmless Sublandlord and Landlord from any claim, liability
or suit, including attorney fees, on behalf of any party for any injury or
damage occurring in or about the Premises where such damage or injury was caused
by any act, omission, negligence or intentional act of Subtenant or by
Subtenant's agents, employees, servants, customers, clients, contractors, or
invitees. Subject to Section 15 above, Sublandlord will defend, indemnify and
hold harmless Subtenant from any claim, liability or suit, including attorney
fees, on behalf of any party for any bodily injury or property damage occurring
in or about the Premises to the extent the damage or injury was caused by the
negligence, act, omission or intentional act of Sublandlord, its agents,
employees, servants, customers or clients. The indemnification obligations
contained in this Section shall not be limited by any worker's compensation,
benefit or disability laws, and each indemnifying party hereby waives any
immunity that the indemnifying party may have under the Industrial Insurance
Act, Title 51 RCW and similar worker's compensation, benefit or disability laws.
SUBLANDLORD AND SUBTENANT ACKNOWLEDGE BY THEIR EXECUTION OF THIS SUBLEASE THAT
EACH OF THE INDEMNIFICATION PROVISIONS OF THIS LEASE (SPECIFICALLY INCLUDING BUT
NOT LIMITED THOSE RELATING TO WORKER'S COMPENSATION BENEFITS AND LAWS) WERE
SPECIFICALLY NEGOTIATED AND AGREED TO BY SUBLANDLORD AND SUBTENANT.

     18. Casualty & Condemnation. Under certain circumstances described in the
Master Lease, either Landlord or Sublandlord may terminate the Master Lease if
there is a fire or other casualty damaging the Building or the Premises, or if
there is a condemnation affecting the Building. Any such termination will
automatically terminate this Sublease. If this Sublease is not terminated, Rent
will abate to the same extend as rent is abated under the Master Lease.

     19. Master Lease.

          19.1 Good Standing. Sublandlord represents and warrants that (a) the
Master Lease is in good standing, (b) there are no agreements other than the
Master Lease between Landlord and Sublandlord concerning the use of the
Premises, (c) notwithstanding Section 19.2, that Sublandlord's interest in the
Master Lease, the Premises and all property identified in Exhibit B are free
from liens or encumbrances, and (d) to Sublandlord's actual knowledge,
Sublandlord has not received notice of any breach or default of the Master Lease
by Sublandlord that has not been cured as of the date of this Sublease.

               19.2 Subordination. This Sublease is subject and subordinate to
the Master Lease, to all ground and underlying leases, and to all mortgages and
deeds of trust which may now or hereafter affect the Property, and to any and
all renewals, modifications, consolidations, replacements and extensions
thereof. Sublandlord agrees not to effect any modification or amendment of the
Master Lease that materially and adversely affects the rights of Subtenant
hereunder without the written consent of Subtenant (which consent shall not be
unreasonably withheld, conditioned or delayed and shall be

                                        7

<PAGE>

deemed granted if not refused within ten (10) days of written request).
Subtenant agrees, upon request of Sublandlord, at any time or times, to execute
and deliver to Sublandlord any and all instruments as shall be required by
Landlord to effect a subordination of this Sublease in accordance with and
subject to the terms of the Master Lease.

          19.3 Adherence to Terms of Master Lease. Subtenant agrees to be bound
by all obligations and responsibilities of Sublandlord as tenant under the
Master Lease, and hereby assumes all obligations of Sublandlord thereunder, to
the extent such obligations and responsibilities are not expressly inconsistent
with or addressed by the terms or conditions of this Sublease, including any
Exhibits appended hereto. Subtenant shall neither do nor permit anything to be
done that would cause Sublandord to be in default under the Master Lease.

     20. Right of Entry. Upon reasonable prior notice to Subtenant (except in
the case of emergency), Sublandlord shall have the right to enter the Premises.

     21. Parking. Sublandlord shall provide to Subtenant at no additional charge
One hundred fifteen (115) unreserved parking spaces, to which Sublandlord is
entitled under the Master Lease.

     22. Rules and Regulations. Subtenant shall observe at all times any and all
rules and regulations promulgated by Landlord that are applicable to the
Premises or any occupant thereof.

     23. Subletting/Assignment.

          23.1 Consent Required. Subtenant shall not sublet the Premises or
assign this Sublease or any part thereof for any period of time without the
prior consent of the Landlord and without Sublandlord's Prior consent. Such
consent by Sublandlord shall not be unreasonably withheld except: (a)
Sublandlord may withhold in its absolute and sole discretion consent to any
mortgage, hypothecation, pledge or other encumbrance of any interest in this
Sublease or the Premises by Subtenant, whereby this Sublease or any interest
therein becomes collateral for any obligation of Subtenant; and (b) Sublandlord
may withhold in its absolute and sole discretion consent if Landlord does not
consent to the proposed transfer. It is agreed that any of the following
factors, or any other reasonable factor, will be reasonable grounds for
Sublandlord deciding whether to consent to Subtenant's request: (i) occupancy by
any proposed assignee, subtenant or other transferee is not consistent with the
maintenance and operation of a Class A office building due to the nature of the
proposed occupant's business or the manner of conducting its business or its
experience or reputation in the community, (ii) occupancy by any proposed
assignee, subtenant or other transferee is likely to cause disturbance to the
normal use and occupancy of the Building by Sublandlord or other occupants; and
(iii) notwithstanding that Subtenant or others remain liable under this
Sublease, whether the proposed assignee, subtenant or other transferee has a net
worth, financial strength and credit record satisfactory to meet all of the
obligations of Subtenant under this Sublease.

          23.2 Recapture. In lieu of granting a consent to a proposed sublease,
assignment or other transfer, Sublandlord reserves the right to terminate this
Sublease or, in the case of a subletting of less than all the Premises, to
terminate this Sublease with respect to such portion of the Premises, as of the
proposed effective date of such subletting or assignment, in which event
Sublandlord may enter into the relationship of landlord and tenant with any
other person or entity (including the sublessee or assignee proposed by
Subtenant) on such terms and conditions as Sublandlord may deem acceptable.

          23.4 Effect of Transfer. No subletting, assignment or other transfer
under this Article 24 shall relieve Subtenant of any liability under this
Sublease, and no consent to any such transfer

                                        8

<PAGE>

shall operate as a waiver of the necessity for consent to a subsequent transfer.
Subtenant promptly shall provide Sublandlord with copies of any instruments of
transfer.

     24. Notice. Any notice regarding a breach of this Sublease or termination
thereof shall be in writing and be sent by certified mail or personally
delivered to, in the case of Sublandlord:

                                        Microsoft Corporation
                                        One Microsoft Way
                                        Redmond, Washington 98052-6399
                                        Attention: Jose Oncina,
                                                   GM, Worldwide Real Estate &
                                                   Facilities

                                        With a copy to:
                                        Microsoft Corporation
                                        One Microsoft Way
                                        Redmond, Washington 98052-6399
                                        Attention: Timothy R. Osborn,
                                                   Law and Corporate Affairs

          Or, in the case of Subtenant:

                                        Light Sciences Corporation
                                        ___________________________
                                        ___________________________
                                        ___________________________
                                        Attention: General Counsel,
                                                   ___________________________.

          Notice shall be deemed given when so delivered to Sublandlord or
Subtenant, or on the date delivery is refused, or three (3) days after it is
placed, properly addressed with postage prepaid, in a depository for United
States certified mail. Either party may provide for a different address by
notifying the other party of said change as provided for herein. Subtenant
agrees to deliver to Sublandlord, simultaneously with delivery to Landlord, a
copy of any notice, demand, request, consent or approval Subtenant sends to
Landlord. Each party agrees to promptly deliver to the other party a copy of any
notice, demand, request, consent or approval received from Landlord and not
transmitted directly to such other party which is relevant on its face to the
rights and obligations hereunder of the other party.

     25. Estoppel Certificate. Upon Sublandlord's request, at any time and from
time to time, Subtenant shall execute and deliver to Sublandlord:

          (a) An estoppel in favor of Landlord and Sublandlord in accordance
with and subject to the terms of the Master Lease, and

          (b) Within seven (7) business days after receipt of the request, a
written instrument, duly executed in favor of Sublandlord:

               (i) Certifying that this Sublease has not been amended or
modified and is in full force and effect or, if there has been a modification or
amendment, that this Sublease is in full force and effect as modified or
amended, and stating the modifications or amendments;

                                        9

<PAGE>

               (ii) Specifying the date to which the rent has been paid;

               (iii) Stating whether, to Subtenant's best knowledge, Sublandlord
is in default and, if so, stating the nature of the default; and

               (iv) Stating the commencement date of the term and whether any
option to extend the term has been exercised.

     26. Surrender of Premises. Subtenant shall, on the last day of the term of
this Sublease, or upon any earlier termination, remove all of its furniture,
furnishings, personal property and equipment and surrender to Sublandlord the
Premises and all improvements to the Premises broom clean in good order,
condition and state of repair, reasonable wear and tear excepted.

     27. Holding Over. If Subtenant holds over after expiration or termination
of this Sublease without written consent of Sublandlord (which consent may be
withheld in Sublandlord's sole judgment), Subtenant shall pay three times the
fixed minimum monthly rental in effect during the last month hereof and all
other charges due hereunder for each month or any part thereof of any such
holdover period. No holding over by Subtenant after the term of this Sublease
shall operate to extend the Sublease term. In the event of any unauthorized
holding over, Subtenant shall indemnify Sublandlord against all costs and claims
for damages, including, without limitation, any claims for damages by any other
tenant to whom Sublandlord or Landlord may have leased all or any part of the
Premises.

          If Subtenant holds over after expiration of the term of this Sublease,
or after the Sublease is terminated, with Sublandlord's consent, Subtenant shall
be deemed to be occupying the Premises under a month-to-month tenancy, and
subject to all the terms, covenants and conditions of this Sublease (other than
the term), except that minimum monthly rent shall be one hundred fifty percent
(150%) of the minimum monthly rent for the last month of the term and the
tenancy shall be terminable by either party on twenty (20) days written notice
to the other party, effective as of the last day of a calendar month.

     28. Consent by Sublandlord. Whenever Sublandlord's consent or approval is
required under this Sublease, such consent or approval may be withheld at
Sublandlord's sole discretion, except as otherwise expressly provided in this
Sublease.

     29. Successors and Assigns. Subject to the restriction contained in Section
24, the covenants and conditions contained in this Sublease shall bind the
heirs, successors, executors, administrators and assigns of the parties.

     30. Brokers. Sublandlord and Subtenant each represents and warrants to the
other that, other than David Milloy of Trammell Crow Company, which represents
Sublandlord, and Tom Erlandson of Alexander Commercial Real Estate, which
represents Subtenant, it did not deal with any broker in connection with this
transaction. Each party agrees to indemnify and defend the other against any
loss, cost or liability, including, without limitation, attorneys' fees, in
connection with the claims of any broker arising from such party's acts.

     31. Attorney Fees. In the event legal proceedings are initiated to enforce
any provision of this Sublease, to recover any rent due under this Sublease, for
the breach of any covenant or condition of this Sublease, or for the restitution
of the Premises to the Sublandlord and/or eviction of the Subtenant, the
prevailing party shall be entitled to recover, as an element of its cost of suit
and not as damages, reasonable attorney fees and costs to be fixed by the court.

                                       10

<PAGE>

     32. Entire Agreement, Merger and Waiver. This Sublease supersedes and
cancels all previous negotiations, arrangements, offers, agreements or
understandings, if any, between the parties. This Sublease expresses and
contains the entire agreement of the parties and there are no express or implied
representations, warranties or agreements between them, except as contained in
this Sublease. This Sublease may not be modified, amended or supplemented except
by a writing signed by both Sublandlord and Subtenant. No consent given or
waiver made by Sublandlord of any breach of Subtenant of any provision of this
Sublease shall operate or be construed in any manner as a waiver of any
subsequent breach of the same or of any other provision.

     33. Captions. The captions of this Sublease are provided for convenience
only and shall not be used in construing its meaning.

     34. Severability. If any provision of this Sublease is found to be
unenforceable, the remainder of this Sublease shall not be affected thereby.

     35. Authority. If Subtenant is a corporation or partnership, each
individual executing this Sublease on behalf of Subtenant represents and
warrants that he or she is duly authorized to execute and deliver this Sublease
on behalf of Subtenant and that this Sublease is binding upon Subtenant
according to its terms. If Subtenant is a corporation, each individual executing
this Sublease on behalf of Subtenant represents and warrants that his or her
authorization to execute and deliver this Sublease was in accordance with a duly
adopted resolution of Subtenant's Board of Directors and Subtenant's Bylaws.
Concurrently, with execution of this Sublease, Subtenant shall deliver to
Sublandlord such evidence of authorization as Sublandlord may require.

     36. Sublandlord and Subtenant Relationship Only. Nothing contained in this
Sublease shall be construed to create the relationship of principal and agent,
partnership, joint venturer or any association between Sublandlord and
Subtenant.

     37. Memorandum of Lease. This Sublease shall not be recorded, and no
memorandum of this Sublease shall be recorded.

     38. Consent to Sublease by Landlord. Sublandlord's obligations under this
Sublease are subject to Landlord's consent to (a) this Sublease; (b) the use
provision contained herein; and (c) the Subtenant Alterations set forth in
Exhibit C. Accordingly, it shall be a condition precedent of Sublandlord's
obligations hereunder that Sublandlord has obtained such consent of Landlord.
Sublandlord and Subtenant hereby agree, for the benefit of Landlord, that this
Sublease and Landlord's consent hereto shall not (a) be deemed to have amended
the Master Lease in any regard (unless Landlord shall have expressly agreed in
writing to such amendment); or (b) be construed as a waiver of Landlord's right
to consent to an assignment of the Master Lease by Sublandlord or any further
subletting of the Master Space, as and to the extent provided in the Master
Lease. Landlord's consent shall, however, be deemed to evidence Landlord's
agreement to the use provisions of this Sublease, the Alterations set forth in
Exhibit C, and that Subtenant shall be entitled to any waiver of claims and of
the right of subrogation for damage to Landlord's property if and to the extent
that the Master Lease provides such waivers for the benefit of Sublandlord.

     39. Environmental.

          (a) Neither Subtenant nor its officers, directors, agents,
contractors, employees or invitees will use, generate, manufacture, produce,
store, release, discharge or dispose of on, under or about the Premises, or
off-site the Premises affecting the Property, or transport to or from the
Premises, any Hazardous Substance except in compliance with Environmental Laws.
The term "Hazardous

                                       11

<PAGE>

Substance" means any hazardous or toxic substance, material or waste, pollutants
or contaminants, as defined, listed or regulated now or in the future by any
federal, state or local law, ordinance, code, regulation, rule, order or decree
regulating, relating to or imposing liability or standards of conduct
concerning, any environmental conditions, health or industrial hygiene,
including without limitation, (i) chlorinated solvents, (ii) petroleum products
or by-products, (iii) asbestos and (iv) polychlorinated biphenyls. The term
"Environmental Law" means any federal, state or local law, statute, ordinance,
regulation or order pertaining to health, industrial hygiene, environmental
conditions or hazardous substances or materials including those defined in this
Article as "Hazardous Substances."

          (b) Subtenant shall give prompt written notice to Sublandlord and
Landlord of any proceeding or inquiry by any governmental authority with respect
to the presence of any Hazardous Substance on the Premises; all claims made or
threatened by any third party against Subtenant or the Premises relating to any
loss or injury resulting from any Hazardous Substance; and Subtenant's discovery
of any occurrence or condition on the Premises that could cause the Premises or
any part thereof to be subject to any restrictions on occupancy, or use of the
Premises under any Environmental Law.

          (c) Subtenant shall protect, indemnify, defend and hold harmless
Sublandlord and Landlord and their directors, partners, officers, employees,
agents, parents, subsidiaries, successors and assigns from any loss, damage,
cost, expense or liability (including reasonable attorneys' fees and costs)
directly or indirectly arising out of or attributable to the use, generation,
manufacture, production, storage, release, discharge, disposal or presence of a
Hazardous Substance on the Premises or off-site of the Premises affecting the
Property caused by Subtenant or its directors, partners, officers, employees,
agents, contractors and invitees, including without limitation, the costs of any
required or necessary repairs, cleanup or detoxification of the Premises and the
preparation and implementation of any closure, remedial or other required plans.

                                        SUBLANDLORD:

                                        GREAT PLAINS SOFTWARE O.C., INC.

                                        By: /s/ Jose Oncina
                                            ------------------------------------
                                        Name: Jose Oncina
                                        Title: GM, Worldwide Real Estate &
                                               Facilities

                                        SUBTENANT:

                                        LIGHT SCIENCES CORPORATION

                                        By: /s/ ALBERT A. LUDERER
                                            ------------------------------------
                                        Name: ALBERT A. LUDERER
                                        Title: President & CEO

                                       12

<PAGE>

SUBLANDLORD

STATE OF WASHINGTON )
                    )ss.
COUNTY OF KING      )

     I certify that I know or have satisfactory evidence that Jose Oncina is the
person who appeared before me, and said person acknowledged that s/he signed
this instrument, on oath stated that s/he was authorized to execute the
instrument and acknowledged it as the GM, Worldwide Real Estate & Facilities of
Microsoft Corporation to be the free and voluntary act of such party for the
uses and purposes mentioned in the instrument.

     Dated: 13 Sept 2002

                                        /s/ Mindy Ann Fossum
                                        ----------------------------------------
                                        Notary Public
                                        Print Name: Mindy Ann Fossum
                                        My commission expires 7-9-05

(SEAL)
(Use this space for notarial stamp/seal)

SUBTENANT

STATE OF WASHINGTON )
                    )ss.
COUNTY OF King      )

     I certify that I know or have satisfactory evidence that Albert Luderer is
the person who appeared before me, and said person acknowledged that s/he signed
this instrument on oath stated that s/he was authorized to execute the
instrument and acknowledged it as the President & CEO of Light Sciences Corp. to
be the free and voluntary act of such party for the uses and purposes mentioned
in the instrument.

     Dated: 9-12-02

                                        /s/ Diane K. Toomey
                                        ----------------------------------------
                                        Notary Public
                                        Print Name: Diane K. Toomey
                                        My commission expires 8-12-05

(SEAL)
(Use this space for notarial stamp/seal)

                                       13

<PAGE>

                                    Exhibit A

                                  MASTER LEASE

                                       A-1
<PAGE>
                                   Schedule B

                                  Master Lease

<PAGE>

                                      LEASE

                   SNOQUALMIE RIDGE CASCADE VIEW LLC, LANDLORD

                    GREAT PLAINS SOFTWARE O.C., INC., TENANT

                                 DATED 3/2/2000

<PAGE>

                                      LEASE

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
1.  Basic Lease Terms....................................................     1
1A. Special Lease Terms..................................................     3
2.  Premises.............................................................     7
3.  Terms................................................................     7
    3.1   Commence.......................................................     7
    3.2   Expire.........................................................     7
4.  Tenant Improvements; Early Possession; Delayed Delivery of
    Possession...........................................................     7
    4.1   Tenant Improvements............................................     7
    4 2   Early Occupancy................................................     7
    4 3   Landlord Delay.................................................     7
    4.4   Tenant Delay...................................................     7
5.  Rent.................................................................     7
    5.1    Rent..........................................................     7
    5.2    Manner of Payment.............................................     8
    5.3    Rent Commencement.............................................     8
6.  Prepaid Rent and Security Deposit....................................     8
    6.1    [Intentionally deleted.]......................................     8
    6.2    Use of Deposit to Cure........................................     8
    6.3    Return of Security Deposit....................................     8
    6.4    Treatment as Secretary Deposit................................     8
    6.5    Landlord's Obligation Regarding Deposit.......................     8
7.  Use of Premises......................................................     8
    7.1    Use...........................................................     8
    7.2    Prohibited Uses...............................................     8
    7.3    No Nuisance...................................................     9
    7.4    Telecommunications Providers..................................     9
8.  Additional Rent for Operating Expenses...............................     9
    8.1    Tenant Payment................................................     9
    8.2    Tenant's Share................................................     9
    8.3    Definitions...................................................     9
    8.4    Determination of Operating Expenses...........................    11
    8.5    Reconciliation................................................    11
    8.6    Upon Lease Termination........................................    11
    8.7    Landlord's Rights.............................................    11
 9. Maintenance and Repair Responsibility................................    11
    9.1    Maintenance Obligations.......................................    11
    9.2    No Obligation for Alteration..................................    11
    9.3    Tenant Waiver.................................................    11
10. Common Areas.........................................................    11
    10.1   Use of Common Areas...........................................    11
    10.2   Definition of Common Areas....................................    12
11. Utilities and Services...............................................    12
    11.1   Furnishing of Utilities.......................................    12
    11.2   Additional Services...........................................    12
    11.3   After Hours...................................................    13
    11.4   Separate Meters...............................................    13
    11.5   Failure.......................................................    13
</TABLE>

                                        i

<PAGE>

<TABLE>
<S>                                                                         <C>
12. Limits On Landlord's Liability.......................................    13
    12.1   Circumstances Beyond Control..................................    13
    12.2   Unreasonable Period of Failure................................    13
    12.3   Tenant Caused.................................................    13
    12.4   No Abatement of Rent..........................................    13
    12.5   No Interference...............................................    13
13. Alterations and Additions by Tenant; Liens and Insolvency............    13
    13.1   Alterations and Additions by Tenant...........................    13
    13.2   Liens and Insolvency..........................................    14
14. Insurance; Indemnity.................................................    14
    14.1   Tenant Waiver.................................................    14
    14.2   Indemnity.....................................................    14
    14.3   Landlord's Responsibility.....................................    14
    14.4   Tenant's Insurance............................................    15
    14.5   Policies......................................................    15
    14.6   Landlord's Insurance..........................................    15
    14.7   Proceeds......................................................    15
    14.8   Waiver of Subrogation.........................................    16
    14.9   Notification of Accidents.....................................    16
15. Destruction..........................................................    16
    15.1   Election to Restore...........................................    16
    15.2   Rent Abatement................................................    16
    15.3   Repairs to Tenant Installations...............................    16
    15.4   No Compensation...............................................    16
16. Condemnation.........................................................    16
    16.1   Termination of Lease..........................................    16
    16.2   Election of Termination.......................................    16
    16.3   Reduction of Rent.............................................    17
    16.4   Award.........................................................    17
    16.5   Landlord Authority............................................    17
17. Assignment and Subletting............................................    17
    17.1  Landlord Consent Required......................................    17
    17.2  Deemed Assignment..............................................    17
    17.3  Recapture......................................................    18
    17.4  Additional Requirements........................................    18
    17.5  Assignment With Bankruptcy.....................................    18
    17.6  Sale...........................................................    18
    17.7  Binding........................................................    18
18. Default..............................................................    18
    18.1  Definition of Default..........................................    18
    18.2  Tenant Notification............................................    19
    18.3  Landlord Default...............................................    19
    18.4  [Intentionally deleted.].......................................    19
19. Remedies in Default..................................................    19
    19.1  Landlord Remedies..............................................    19
    19.2  Tenant Payment of Costs........................................    19
    19.3  Termination....................................................    19
    19.4  No Termination.................................................    20
    19.5  Landlord Election to Make Tenant Advances......................    20
20. Access...............................................................    20
21. Surrender of Premises; Hold-over Tenancy.............................    20
    21.1  Surrender of Premises..........................................    20
    21.2  Hold-over Tenancy..............................................    20
</TABLE>

                                       ii

<PAGE>

<TABLE>
<S>                                                                         <C>
22. Compliance With Laws.................................................    20
23. Rules and Regulations................................................    21
24. Parking..............................................................    21
25. Estoppel Certificates................................................    21
26. Subordination........................................................    21
27. Removal of Property..................................................    22
28. Personal Property Taxes..............................................    22
29. Notices..............................................................    22
30. Condition of Premises................................................    22
31. Hazardous Substances.................................................    22
    31.1  Tenant's Obligations...........................................    22
    31.2  Tenant Indemnity...............................................    22
    31.3  Landlord Inspection............................................    23
    31.4  Survival.......................................................    23
32. Signs................................................................    23
33. General Provisions...................................................    23
    33.1  Attorneys' Fees................................................    23
    33.2  Governing Law, Venue...........................................    23
    33.3  Cumulative Remedies............................................    23
    33.4  Exhibits; Addenda..............................................    23
    33.5  Interpretation.................................................    23
    33.6  Joint Obligation...............................................    23
    33.7  Keys...........................................................    24
    33.8  Late Charges; Interest.........................................    24
    33.9  Light, Air, and View...........................................    24
    33.10 Measurements...................................................    24
    33.11 Name...........................................................    24
    33.12 Prior Agreements; Amendments...................................    24
    33.13 Recordation....................................................    24
    33.14 Liability......................................................    24
    33.15 Severability...................................................    25
    33.16 Time...........................................................    25
    33.17 Waiver.........................................................    25
    33.18 No Waste.......................................................    25
    33.19 Force Majeure..................................................    25
    33.20 Quiet Enjoyment................................................    25
    33.21 [Intentionally deleted.].......................................
34. Authority of Tenant..................................................    25
    34.1  Tenant as Corporation..........................................    25
    34.2  Tenant as Partnership or LLC...................................    25
35. Financial Statements.................................................    25
36. Commissions..........................................................    26
</TABLE>

Exhibits to This Lease:

Exhibit A-1 Premises
Exhibit A-2 Legal Description of Property
Exhibit A-3 Legal Description of Business Park
Exhibit B   Work Letter

                                       iii

<PAGE>

                                      LEASE

Lease, dated for reference purposes as of 3/2, 2000, between SNOQUALMIE RIDGE
CASCADE LLC, a Washington limited liability company ("Landlord"), and GREAT
PLAINS SOFTWARE O.C., INC., a Minnesota corporation ("Tenant").

     Basic Lease Terms. This Section sets forth certain basic terms of this
Lease for reference purposes. This Section is to be read in conjunction with the
other provisions of this Lease; provided, however, to the extent of any
inconsistency between this Section and the other provisions of this Lease, this
Section shall control.

LEASED PREMISES (See Section 2)

Business Park     Snoqualmie Ridge Business Park
Building Name     Cascade View
Address           34931 S.E. Douglas Street, Suite 200
                  Snoqualmie, WA 98065
Rentable Sq. Ft   28,650 RSF

RENT; PREPAID RENT; SECURITY DEPOSIT (See Section 5 and 6)

BASE MONTHLY RENT
Month 1-2           $0.00/Month (See Section 1A.7)
Months 3-36         $44,178.00/Month
Months 37-60        $48,161.00/Month
Months 61-84        $51,054.00/Month
Months 85-120       $55,638.00/Month
Prepaid Rent        $44,178.00 for Month 3 (See Section 1A.6)
Security Deposit    $44,178.00 (See Section 1A.6)

TERM (See Section 3)
Commencement Date        June 19, 2000
Rent Commencement Date   June 19, 2000
Expiration Date          June 18, 2010
Length of Term           10 Years
Renewal Option           ONE 5-YEAR EXTENSION (See Section 1A.1)

PERMITTED USE (See Section 7)
General Office Use, Including software development, sales and training

SUBLEASING (See Section 17)
Tenant shall have the right to sublease the Premises subject to all of the terms
and conditions of Section 17.

OPERATING EXPENSES (See Section 8)
Tenant's Share    50%
Additional Rent   $14,210.00/Month (See Section 1A.6)

PARKING (See Sections 1A.4 AND 24) APPROXIMATELY 114 STALLS

CC&RS (See Sections 8.3.1 AND 23)
Declaration of Protective Covenants, Conditions, Restrictions, Easements &
Agreements for Snoqualmie Ridge Business Park Recorded Under King County
Recording No. 9804301674, as may be amended

BROKERS (See Section 36)
FOR TENANT     COLLIERS INTERNATIONAL
FOR LANDLORD   THE BRODERICK GROUP

ADDRESSES FOR NOTICES (See Section 29)

Landlord:

(Street Address)

Snoqualmie Ridge Cascade View LLC
c/o The Quadrant Corporation
11100 NE 8th Street, Suite 500
Bellevue, WA 98004
Attn: Commercial Division
Tel: 425-455-2900
Fax: 425-646-8300.

(Mailing Address)

Snoqualmie Ridge Cascade View LLC
c/o The Quadrant Corporation, Manager
P.O. Box 130
Bellevue, WA 98009

                                       1

<PAGE>

Tenant
Great Plains Software O.C., Inc.
1701-38th Street SW
Fargo, ND 58103
Attn: General Counsel
Tel: 701-281-6900
Fax: 701-281-6844

                                       2

<PAGE>

1A.  Special Lease Terms. The following additional Lease terms shall apply. To
     the extent of any inconsistency between this Section 1A and the other
     provisions of this Lease, this Section 1A shall control.

     1A.1 Renewal Option.

          1A.1.1 Grant of Renewal Option. Tenant shall have one option to extend
               the Term of this Lease for an additional five years ("Renewal
               Term"). Such option may be exercised by Tenant only by written
               notice of exercise to Landlord given no earlier than 18 months
               and no later than six months prior to the expiration of the Term.

          1A.1.2 Effect of Exercise. Upon such exercise, the parties shall be
               obligated under all the terms and conditions of this Lease
               through the Renewal Term, except that (a) Base Monthly Rent at
               the commencement of the Renewal Term shall be equal to the higher
               of (i) the Base Monthly Rent in the final month of the Term or
               (ii) the Fair Market Monthly Rent for the Premises as of 90 days
               after Tenant's notice of exercise, and (b) the Base Monthly Rent
               starting at the 37th month of the Renewal Term and for the
               balance of the Renewal Term shall equal the amount specified in
               clause (a) above increased by the higher of (i) nine percent (9%)
               or (ii) a percentage increase equal to cumulative percentage
               increase, if any, in the CPI (as defined below) between the first
               month of the Renewal Term and the 36th month of the Renewal Term.
               As used herein, "CPI" shall mean the Consumer Price Index for All
               Urban Consumers, All Items Index for the Seattle Everett
               metropolitan area, as published by the Bureau of Labor Statistics
               of the United States Department of Labor, or, in the event such
               index is no longer published, a successor or substitute index
               using factors most comparable to such index, appropriately
               adjusted. The CPI in effect on the beginning of each year shall
               be the CPI published as of December 31 of the prior year
               reflecting all price changes through the end of such prior year..
               As used herein, the "Fair Market Rent" shall mean the prevailing
               fair market monthly rent for comparable space located within two
               miles from the I-90 corridor running between Mercer Island,
               Washington and Snoqualmie Ridge Business Park (the "Rent
               Comparison Area") and shall take into account the Base Monthly
               Rent increase during the 37th month of the Renewal Term as
               specified above. Upon determination of the Fair Market Rent as
               described below, the parties shall execute an amendment to the
               Lease memorializing the Base Monthly Rent for the Renewal Term.

          1A.1.3 Determination of Rent for Renewal Term.

               (a)  Within 20 days of Tenant's notice of exercise, Landlord
                    shall propose a Base Monthly Rent for the extended Term. The
                    parties shall negotiate in good faith, but if they are
                    unable to agree upon such Base Monthly Rent by 30 days after
                    the delivery of Landlord's proposal, then either party may
                    elect to cause such Base Monthly Rent to be determined by
                    reference to the appraised Fair Market Rent. Such election
                    shall be made by such party by notice to the other party,
                    including in such notice the designation of an appraiser.
                    The other party may accept such appraiser or designate
                    another appraiser within ten days of such notice. If it does
                    not designate another appraiser in such period, it shall be
                    deemed to have accepted the first appraiser. If a second
                    appraiser is designated, the two appraisers shall promptly
                    appoint a third appraiser.

                                        3

<PAGE>

               (b)  Each appraiser shall determine the Fair Market Rent by
                    reference to all factors deemed appropriate in his or her
                    professional opinion, and notify the parties within 30 days
                    of the date of appointment of the last appraiser of such
                    Fair Market Rent. The Base Monthly Rent for the extended
                    Term shall be calculated as provided in Section 1A.1.2 with
                    the Fair Market Rent equaling the amount determined by the
                    single appraiser or, if there are three appraisers, the mean
                    average of the two closest Fair Market Rents.

               (c)  All appraisers under this appraisal provision shall be
                    independent certified professional MAI appraisers with at
                    least five years' experience appraising office properties
                    within the Rent Comparison Area. If there are three
                    appraisers, each party shall pay for the cost of its
                    designated appraiser and 50% of the cost of the third
                    appraiser. If there is only one appraiser, each party shall
                    pay 50% of the cost of such appraiser.

          1A.1.4 Tenant may not exercise its option to renew the Term at any
               time in which it is in Default (as defined in Section 18.1). If
               Tenant becomes in Default after exercise of its option to extend
               the Term but before the commencement of the extended Term,
               Landlord may, in addition to its other remedies under this Lease,
               elect to terminate such extension by notice in writing to Tenant,
               whereupon the Term shall expire without any such extension.

     1A.2 Right of First Refusal. Landlord shall grant Tenant the right of first
          refusal to lease any previously-unleased first generation space on the
          first floor of the Building (the "ROFR Space") in accordance with the
          following terms (the "ROFR"):

          1A.2.1 Receipt of Offer, Delivery to Tenant. In the event that
               Landlord receives an offer to lease ROFR Space in the form of a
               proposal or letter of intent or lease ("Offer"), and Landlord has
               either determined that it is ready to accept such Offer, or has
               accepted such Offer subject to Tenant's rights under this
               Agreement, Landlord shall so notify Tenant in writing ("Offer
               Notice"). The Offer Notice shall set forth all of the material
               terms of the Offer ("Offer Terms"), provided, however, in no
               event shall Landlord have any obligation to disclose the identity
               of the prospective tenant.

          1A.2.2 Exercise of ROFR. Tenant shall have the right to elect to lease
               the ROFR Space identified in the Offer Notice which right must be
               exercised if at all by written notice ("ROFR Exercise Notice")
               from Tenant received by Landlord on or before the expiration of
               ten (10) business days after Tenant's receipt of the Offer
               Notice.

          1A.2.3 Effect of Non-Exercise of ROFR. If Tenant does not timely
               deliver an ROFR Exercise Notice in accordance with Section
               1A.2.2, Landlord shall be free to lease the ROFR Space on the
               Offer Terms, free and clear of the ROFR, but subject to Section 1
               A.2.4.

          1A.2.4 Changes in Offer Terms. In the event of any material changes in
               the Offer Terms prior to execution of a written lease pursuant to
               the Offer, Landlord shall give written notice thereof to Tenant
               ("Change Notice"). The Change Notice shall identify all of the
               revised Offer Terms. Tenant shall have the right to elect to
               lease the ROFR Space, which right must be exercised if at all by
               ROFR Exercise Notice from Tenant received by Landlord on or
               before the expiration of three business days after Tenant's
               receipt of the Change Notice. If Tenant does not

                                        4

<PAGE>

               timely deliver a ROFR Exercise Notice in accordance with this
               Section 1A.2.4, Landlord shall be free to lease the ROFR Space on
               the revised Offer Terms, free and clear of the ROFR, but subject
               to this Section 1A.2.4 in the event of further material changes
               in the Offer Terms. For purposes of this Section 1A.2.4,
               "material changes" shall include substantial economic changes,
               including, without limitation, a change in the amount of the
               Monthly Base Rent by more than $.50 per RSF from that specified
               in the Offer Terms or a reduction of the proposed term of 2 years
               or more from that term specified in the Offer Terms.

          1A.2.5 Effect of Exercise. If Tenant exercises the ROFR by delivering
               the ROFR Exercise Notice to Landlord in strict accordance with
               Section 1A.2.2 or 1A.2.4, as the case may be, Tenant shall be
               absolutely and unconditionally bound to lease the ROFR Space on
               the Offer Terms and in accordance with the provisions of this
               Lease (except that to the extent that the Offer Terms and the
               Lease conflict, the Offer Terms shall govern with respect to the
               ROFR Space) and the Lease shall be modified to reflect the Offer
               Terms. Within ten business days of the ROFR Exercise Notice,
               Landlord and Tenant shall enter into a written amendment to this
               Lease adding the ROFR Space to the Premises and reflecting the
               applicable modifications to the Lease described above.

          1A.2.6 Prior' Rights to ROFR Space. Tenant acknowledges that Landlord
               as of the date hereof may have entered into a lease or is
               currently negotiating a lease for the balance of first generation
               space in the Building with a prospective tenant ("Prospective
               First Floor Tenant") and any space on the first floor of the
               Building that is subject to such lease or lease negotiations with
               such Prospective First Floor Tenant shall not be subject to the
               ROFR.

     1A.3 Normal Business Hours. Normal hours of operation for the Building are
          Monday through Fridays from 7:00 a.m. to 6:00 p.m. and Saturdays from
          8:00 a.m. to 12:00 p.m., but excluding those days that are nationally
          recognized holidays (the "Normal Business Hours"). Tenant shall have
          access to the Premises 24 hours per day, seven days per week, every
          day of the year.

     1A.4 Parking. All parking provided to Tenant shall be available and
          accessible on a non-reserved basis, twenty-four (24) hours per day,
          seven (7) days week, every day of the year.

     1A.5 Signage.

          1A.5.1 Building Exterior Signage. Tenant shall be entitled to mount
               one sign on the exterior portion of the Building, subject to the
               following:

               (a)  The location, design and construction of the signage meets
                    all business park and municipal requirements;

               (b)  The design, permitting, manufacture, installation and
                    maintenance of such signage shall be at Tenant's sole cost
                    and expense; and

               (c)  Tenant's signage meets with Landlord's approval, which shall
                    not be unreasonably withheld or delayed.

                                        5

<PAGE>

          1A.5.2 Interior Signage. Landlord shall provide Business Park standard
               suite and directory signage.

     1A.6 Security Deposit/Prepaid Rent. Tenant covenants that it shall deliver
          to Landlord in cash or other immediately available funds the Security
          Deposit and Prepaid Rent specified in Section 1 (collectively,
          "Deposit") by no later than June 1, 2000 or the date of Tenant's
          occupancy of the Premises, whichever date is earlier. Tenant's failure
          to timely deliver the Deposit to Landlord in accordance with this
          Section 1A.6 shall constitute a Default (as defined in Section 18.1
          below).

     1A.7 Free Rent Period. Tenant shall have no obligation to pay Base Monthly
          Rent during the first two months of the Term ("Free Rent Period").
          Tenant shall remain responsible for paying any and all Additional Rent
          due under the Lease during the Free Rent Period.

     1A.8 Tenant's Right to Audit Annual Reconciliations. Tenant shall have the
          right, for a period of 90 days following receipt of Landlord's annual
          reconciliation of Operating Expenses under Section 8.5, and upon 30
          days prior written notice to Landlord, to examine and conduct an audit
          of, at the main accounting offices of Landlord or its property
          manager, the books and records of Landlord pertaining solely to the
          Operating Expenses for the calendar year covered in such written
          statement. Such audit shall be conducted by an independent certified
          accounting firm retained by Tenant that is reasonably acceptable to
          Landlord. Tenant shall deliver a copy of the audit and supporting
          calculations to Landlord within 30 days after completion of the audit,
          which audit determination shall be binding on the parties. If Tenant's
          audit reveals an overpayment by Tenant greater than 5% of the amount
          determined by Landlord, Landlord shall promptly reimburse Tenant for
          such overpayment and shall bear all costs and expenses for Tenant's
          audit. If the audit reveals an overpayment of 5% or less than the
          amount determined by Landlord, then Tenant shall bear all costs and
          expenses for such audit and Tenant shall receive a credit against its
          next payable Rent in the amount of such overpayment, or such amount
          shall otherwise be refunded to Tenant as Landlord determines in its
          sole discretion.

     1A.9 Landlord's Right to Relocate HVAC Air Shaft. Tenant acknowledges that
          Landlord may construct the HVAC air shaft for the Building in a
          particular location to accommodate the special requirements of the
          Prospective First Floor Tenant. If, at any time, Landlord needs to
          relocate the HVAC air shaft to accommodate the needs of a different
          tenant on the first floor of the Building, Landlord reserves the right
          to enter the Premises and relocate such HVAC shaft; provided that such
          relocation shall be performed at Landlord's cost and expense and
          Landlord shall use reasonable efforts to minimize any disruption to
          the Tenant's use of the Premises during the period of such relocation.

     1A.10 Designation of Restrooms as Part of Premises or Common Areas. Tenant
          acknowledges that the parties had originally intended that all of the
          restrooms in the Building be part of the Common Areas, in which case
          Landlord would clean and maintain such restrooms as part of its Common
          Area maintenance obligations under Section 9.1.. If, however, Landlord
          enters into a lease with the Prospective First Floor Tenant, the first
          floor restrooms will become part of the Prospective First Floor
          Tenant's premises and the second floor restrooms will become part of
          the Premises. In such case, neither the Rentable Square Footage of the
          Premises, the Base Monthly Rent nor Tenant's Share will be adjusted,
          and Landlord will clean and maintain the second floor restrooms as
          part of the janitorial services that Landlord will provide the
          Premises pursuant to Section 11.1. In either case, the costs and
          expenses of cleaning and maintaining the restrooms shall constitute an
          Operating Expense under Section 8.3.

                                        6

<PAGE>

2.   Premises. Landlord agrees to lease to Tenant and Tenant agrees to lease
     from Landlord the Premises described on Exhibit A-1 and consisting of
     approximately the square feet designated in Section 1. The Premises are a
     part of the Building, located on the real property described on Exhibit A-2
     ("Property"). The Premises, Building, and Property are part of a business
     park described on Exhibit A-3 ("Business Park").

3.   Term.

     3.1  Commence. The term of this Lease ("Term") shall commence on the
          Commencement Date set forth in Section 1, subject to Section 4.

     3.2  Expire. The Term shall expire on the Expiration Date set forth in
          Section 1, unless sooner terminated or extended as provided in this
          Lease.

4.   Tenant Improvements; Early Possession; Delayed Delivery of Possession.

     4.1  Tenant Improvements. Any improvements to or construction on the
          Premises shall be carried out in accordance with the Work Letter
          attached as Exhibit B.

     4.2  Early Occupancy. If Landlord permits Tenant to occupy the Premises
          prior to the Commencement Date set forth in Section 1, the
          Commencement Date and Rent Commencement Date shall be such date of
          occupancy. Tenant's occupancy prior to the originally scheduled
          Commencement Date shall be subject to all the provisions of this Lease
          and shall not advance the Expiration Date.

     4.3  Landlord Delay. If Landlord for any reason cannot deliver possession
          of the Premises to Tenant at the Commencement Date, (i) the
          Commencement Date shall be the date on which possession of the
          Premises is delivered to Tenant, (ii) this Lease shall not be void or
          voidable, nor shall Landlord be liable to Tenant for any loss or
          damage resulting therefrom except as set forth in this Section, (iii)
          the Rent Commencement Date shall be delayed to the same extent as the
          delay in the Commencement Date, except as provided in Section 4.4, and
          (iv) the Expiration Date shall be adjusted so that the length of the
          Lease Term remains as provided in Section 1, which shall be confirmed
          by Landlord's written notice to Tenant setting forth the adjusted
          Commencement Date, Rent Commencement Date and Expiration Date. If
          Landlord is unable to deliver possession of the Premises to Tenant by
          August 19, 2000 for any reason other than Tenant Delay or Force
          Majeure (each as defined in the Work Letter), then in addition to
          extension of the Commencement Date, Rent Commencement Date and
          Expiration Date, Landlord shall pay Tenant $100 for each day that
          delivery of possession is delayed beyond August 19, 2000.

     4.4  Tenant Delay. If Tenant Delay (as defined in the Work Letter) causes
          any delay in Landlord's completion of the Premises, and thereby delays
          Tenant's occupancy of the Premises beyond the Commencement Date set
          forth in Section 1, then Tenant shall commence payment of Rent on the
          Rent Commencement Date set forth in Section 1, and in such case the
          timing of the increases in Base Monthly Rent, as set forth in Section
          1, shall be based upon the Rent Commencement Date rather than the
          Commencement Date.

5.   Rent.

     5.1  Rent. Tenant shall pay to Landlord the Base Monthly Rent specified in
          Section 1 and the Additional Rent as set forth in Section 8 and
          elsewhere in this Lease (the Base Monthly

                                        7
<PAGE>

          Rent and the Additional Rent are collectively referred to as "Rent").
          Rent shall be paid in advance, on or before the first day of each
          calendar month of the Lease Term.

     5.2  Manner of Payment. Rent shall be paid without prior notice, demand,
          set off, counterclaim, deduction or defense and, except as otherwise
          expressly provided in this Lease, without abatement or suspension. All
          Rent shall be paid to Landlord at the address for notices set forth in
          Section 1, in lawful money of the United States of America, or to such
          other person or at such other place as Landlord may from time to time
          designate in writing;

     5.3  Rent Commencement. Payment of Rent shall begin on the Rent
          Commencement Date set forth in Section 1, subject to Section 1A.7 and
          Section 4. Rent for any period during the Lease term that is for less
          than one month shall be prorated for the actual number of days in such
          period.

6.   Prepaid Rent and Security Deposit.

     6.1  Deposit. [Intentionally deleted. See Section 1A.6.]

     6.2  Use of Deposit to Cure. Landlord shall have the right to all or any
          part of the Deposit to cure any Default by Tenant under this Lease or
          to compensate Landlord for any damage sustained by it resulting from
          such Default. In the event of any such application of the Deposit,
          Tenant shall, on demand, immediately pay to Landlord the amount
          necessary to replenish the Deposit to the amount set forth in Section
          1.

     6.3  Return of Security Deposit. If Tenant is not in Default at the
          expiration or termination of this Lease, Landlord shall return the
          remaining Security Deposit to Tenant, less any amounts necessary to
          return the Premises to their original condition, reasonable wear and
          tear and those alterations not required by Landlord to be removed by
          Tenant under Section 13.1 excepted.

     6.4  Treatment as Security Deposit. In the event this Lease is terminated
          before the end of the Term for any reason, any Rent paid for any
          period after the date of such termination shall be treated as an
          addition to the Security Deposit.

     6.5  Landlord's Obligation Regarding Deposit. Landlord's obligations with
          respect to the Security Deposit are those of a debtor and not a
          trustee. Landlord may maintain the security deposit separate from
          Landlord's general funds or may commingle the Security Deposit with
          other funds of Landlord. No interest shall accrue for Tenant on the
          Deposit.

7.   Use of Premises.

     7.1  Use. Tenant shall use the Premises only for the purpose set forth in
          Section 1. The Premises may not be used for any other purpose without
          Landlord's written consent. Landlord represents to Tenant that the
          purpose set forth in Section 1 is permitted as of the date hereof
          under the applicable laws, regulations and codes governing zoning,
          land use and similar matters affecting the Building and the Property
          (collectively, the "Zoning Laws"). Any changes in the Zoning Laws or
          any changes in Tenant's use of the Premises that are not permitted
          under the Zoning Laws will not be a basis for terminating this Lease,
          for abating or offsetting Rent or for otherwise seeking damages.

     7.2  Prohibited Uses. Tenant shall not do or permit anything to be done in
          or about the Premises or bring or keep anything therein which will in
          any way increase the cost of or affect any fire or other insurance
          upon the Building or any part thereof or any of its

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<PAGE>

          contents, or cause cancellation of any insurance policy covering the
          Building or any part thereof or any of its contents.

     7.3  No Nuisance. Tenant shall not do or permit anything to be done in or
          about the Premises that will obstruct or interfere with the rights of
          other tenants or occupants of the Building or Business Park or injure
          them or their property, or use or allow the Premises to be used for
          any unlawful purpose or in any way constituting a nuisance. Tenant
          shall not, without the prior written consent of Landlord, use any
          apparatus, machinery or device in or about the Premises which will
          cause any substantial noise or vibration. Tenant shall not place any
          boxes, cartons or other rubbish in the corridors or other Common Areas
          (defined in Section 10), Building, Property or Business Park. Tenant
          shall use due care in the use of the Premises and of the Common Areas
          (defined in Section 10), Building Property or Business Park, and shall
          not neglect or misuse water fixtures, electric lights and heating and
          air-conditioning apparatus.

     7.4  Telecommunications Providers. Tenant acknowledges that any provision
          of telecommunications, data transmission and office automation
          services, equipment and systems by a third party provider, its agents,
          affiliates and successors, that has a right, whether exclusive or not,
          to provide such services to the Premises, Building or Business Park
          (each a "Provider") is entirely separate and distinct from this Lease
          and that Landlord has no duty of performance concerning the provision
          of services by a Provider. Tenant hereby agrees to look solely to the
          Provider for any failure in the provision of services provided by such
          Provider.

8.   Additional Rent for Operating Expenses.

     8.1  Tenant Payment. Tenant shall pay, as Additional Rent, Tenant's Share,
          as set forth in Section 1, of all Operating Expenses. Tenant's payment
          of Additional Rent shall be made in the same manner as Base Monthly
          Rent.

     8.2  Tenant's Share. Tenant's Share shall be the percentage of all
          Operating Expenses for the Building set forth in Section 1 as
          determined by Landlord, based upon the percentage that the approximate
          rentable area of the Premises set forth in Section 1 bears to the
          approximate rentable area of the Building.

     8.3  Definitions.

          8.3.1 Definition of Operating Expenses. "Operating Expenses" means all
               expenses and charges incurred by Landlord in the operation of the
               Building, Property and Common Areas (as defined in Section 10),
               as a first-class facility, including without limitation the
               following costs by way of illustration: (i) all real property
               taxes, assessments and other general or special charges levied
               during the Term by any public, governmental or quasi governmental
               authority against the real or personal property included in the
               Building or the Property, including without limitation Landlord's
               personal property used in the maintenance, repair or operation of
               the Building or the Property, or any other tax on the leasing of
               the Building or on the rents from the Building (other than any
               federal, state or local income or franchise tax); (ii) any and
               all assessments Landlord must pay for the Building or Property
               pursuant to the CC&Rs specified in Section 1, transportation or
               any other improvement monitoring or management plan, or any other
               covenant, condition or reciprocal easement agreements; (iii)
               electricity, gas and similar energy sources, refuse collection,
               water, sewer and other utilities services for the Building and
               the Property; provided, however, to the extent that any such
               services are separately metered to Tenant, Tenant shall pay the
               actual separately

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<PAGE>

               incurred charges; (iv) annual inspection fees, property
               management fees paid to independent or affiliated contractors or
               to Landlord, and legal, accounting and other professional
               expenses; (v) janitorial, cleaning, window washing and refuse
               removal; (vi) all costs of improvements or alterations to the
               Building, Property and Common Areas required by Laws, to save
               labor, or reduce Operating Expenses; (vii) all premiums and
               deductibles for liability, property damage, casualty, automobile,
               garage keeper's, rental loss, compensation or other insurance
               maintained by Landlord for the Building or Property; (viii) the
               cost of any capital improvements made to the Property, Building
               or Common Areas by Landlord for the replacement of any Building
               equipment needed to operate the Building or the Common Areas at
               the same quality levels as prior to the replacement; (ix) air
               conditioning, heating, ventilating, plumbing, electrical systems,
               elevator maintenance supplies, materials, equipment and tools;
               (x) the repair of the air conditioning, heating, ventilating,
               plumbing, electrical systems and elevators of the Building; (xi)
               maintenance costs, including reasonable payroll expenses, rental
               of personal property used in maintenance and all other upkeep of
               parking and Common Areas, including cleaning, snow and ice
               removal, landscaping and lighting; (xii) costs and expenses of
               repairs, resurfacing, repainting, and similar items, including
               appropriate reserves, (xiii) costs and expenses associated with
               security and monitoring; (xiv) reasonable costs incurred in the
               management of the Building and Property (including supplies,
               reasonable wages and salaries of employees used in the
               management, operation and maintenance thereof and payroll taxes
               and similar governmental charges with respect thereto, and
               Building management office rental, if any; (xv) all license and
               permit fees; (xvi) any other expense or charge whether or not
               described above that in accordance with generally accepted
               accounting and management practices is properly an expense of
               maintaining, operating or repairing the Building, Property or
               Common Areas. Operating Expenses shall not include depreciation
               on the Building or equipment therein, Landlord's executive
               salaries, real estate brokers' commissions, and costs or expenses
               for which Landlord is reimbursed or indemnified, by an insurer,
               condemnor, tenant or otherwise. Landlord shall not collect more
               than 100% of Operating Expenses and shall not recover any item of
               cost more than once. If, in Landlord's reasonable determination,
               certain Operating Expenses vary in direct relationship to
               occupancy of the Building, Tenant's Share of such Operating
               Expenses shall be adjusted to reflect that portion of the whole
               which the rentable square feet of the Premises bears to the
               rentable square footage of the Building, as applicable, which is
               actually occupied by tenants.

          8.3.2 Definition and Treatment of Capital Improvements. As used
               herein, Capital Improvement shall mean the replacement of any
               major component or element of the Building or Common Areas, the
               cost of which exceeds $10,000. The cost of any Capital
               Improvement included in Operating Expenses pursuant to this Lease
               shall be amortized over the useful life of the Capital
               Improvement with interest accruing on the unamortized balance at
               the prime rate then in effect at the Seattle Head Office of Bank
               of America d/b/a Seafirst Bank or its successors, or such higher
               rate as may have been paid by Landlord on funds borrowed for the
               purpose of paying for such Capital Improvement. Subject to
               Section 12.3, Landlord shall be responsible at its sole cost and
               expense for Capital Improvements related to the repair or
               replacement of the structural portions of the Building, which
               structural portions consist of the foundation, bearing and
               exterior walls, subflooring, and roof structure and the cost of
               such Capital improvements shall not be included in Operating
               Expenses.

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<PAGE>

     8.4  Determination of Operating Expenses. Prior to each January 1 of the
          Term, Landlord shall furnish Tenant a written statement of the
          estimated monthly Tenant's Share of Operating Expenses for the coming
          calendar year. The estimated monthly Tenant's Share of Operating
          Expenses for the period before the first January 1 after the
          Commencement Date is set forth in Section 1. Landlord may, by written
          notice to Tenant, revise its estimate of Tenant's Share of Operating
          Expenses from time to time.

     8.5  Reconciliation. Within 90 days after each January 1 during the Term,
          or as soon thereafter as practicable, Landlord shall deliver to Tenant
          a written statement setting forth the actual Operating Expenses and
          Tenant's Share thereof during the preceding calendar year (or portion
          of such calendar year after the Commencement Date). To the extent
          Tenant's Share of such actual Operating Expenses exceeded the
          estimated Tenant's Share thereof paid by Tenant, Tenant shall pay
          Additional Rent to Landlord within 30 days after receipt of such
          statement by Tenant. To the extent Tenant's Share of such actual
          Operating Expenses was less than the estimated Tenant's Share thereof
          paid by Tenant, Tenant shall receive a credit against its next payable
          Rent or such amount shall otherwise be refunded to Tenant as Landlord
          determines in its sole discretion.

     8.6  Upon Lease Termination. If this Lease shall expire or otherwise
          terminate other than on a December 31, Landlord may in its discretion
          make a special determination of Tenant's Share of actual Operating
          Expenses for the partial calendar year ending on the date of such
          expiration or other termination, or may defer such determination until
          its usual reconciliation of Operating Expenses for the Building for
          the entire calendar year. The excess actual Tenant's Share for such
          partial calendar year shall be paid to Landlord, or the excess
          estimated Tenant's Share already paid by Tenant, as the case may be,
          shall be paid by Tenant to Landlord or Landlord to Tenant, as the case
          may be, within 30 days of such determination.

     8.7  Landlord Rights. Landlord shall have the same rights with respect to
          Tenant's nonpayment of Tenant's Share of Operating Expenses as
          required under this Lease as it has with respect to any other
          nonpayment of Rent under this Lease.

9.   Maintenance and Repair Responsibility.

     9.1  Premises Maintenance Obligations. Subject to Section 7.3, 12.3 and 15,
          Landlord shall maintain and keep in good condition and repair
          throughout the Term the entire Premises, the Building, and the Common
          Areas in a manner and at a level of quality that is consistent with
          comparable buildings in the area (the "Maintenance Obligations").
          Except as otherwise expressly provided in this Lease, all cost and
          expenses incurred by Landlord in performing the Maintenance
          Obligations shall be considered Operating Expenses.

     9.2  No Obligation For Alteration. Except as specifically provided
          elsewhere in this Lease, Landlord shall have no obligation whatsoever
          to alter, remodel, improve, repair, decorate, or paint the Premises or
          any part thereof. Tenant affirms that Landlord has made no
          representations to Tenant about the condition of the Premises or the
          Building, except as specifically herein set forth.

     9.3  Tenant Waiver. Tenant waives the right to make repairs at Landlord's
          expense under any law, statute, or ordinance now or hereafter in
          effect.

10.  Common Areas.

     10.1 Use of Common Areas. Provided Tenant is not in Default under the Lease
          and subject to the other terms and conditions of this Lease, Tenant
          shall have the right to use the

                                       11

<PAGE>

          Common Areas on a non-exclusive basis with Landlord, other tenants in
          the Building and the Business Park and their respective officers,
          employees, guests, invitees and agents. Landlord shall have the right
          to establish and enforce reasonable rules and regulations applicable
          to all tenants concerning the maintenance, management, use, and
          operation of the Common Areas; and to make changes to the Common
          Areas, including without limitation changes in the location of
          lobbies, driveways, entrances, exits, vehicular parking spaces,
          parking areas, pedestrian and bicycle trail areas, or the direction of
          the flow of traffic.

     10.2 Definition of Common Areas. In this Lease, "Common Areas," means all
          parts of the Building and related land areas and facilities outside
          the Premises and the premises leased or available for lease to other
          tenants, but constituting a part of Business Park. Common Areas
          include, without limitation:

          10.2.1 the Building's common entrances, lobbies, all restrooms in the
               Building other than those located within a tenant's premises,
               elevators, stairway and accessways, loading docks, ramps, drives
               and platforms and any passageways and serviceways thereto, and
               mechanical and electrical systems for the Building, including
               without limitation, plumbing, sewage, electrical systems, pipes
               conduits, wires and appurtenant equipment of the Building, all to
               the extent serving the Premises;

          10.2.2 the open areas, landscaped areas, sidewalks, pedestrian
               walkways and patios, roadways, pedestrian and bicycle trails,
               driveways, parking areas, utility systems and facilities, service
               areas, refuse areas and all other areas in the Business Park and
               available for use in common with all tenants, guests and invitees
               of the Business Park, located outside the Premises and the
               premises leased or available for lease to other tenants in the
               Business Park.

11.  Utilities and Services.

     11.1 Furnishing of Utilities and Services. Provided that Tenant is not in
          Default under this Lease, Landlord shall cause to be furnished to the
          Premises the following utilities and services, during Normal Business
          Hours: (i) electricity for normal lighting and office machines, (ii)
          heat and air conditioning required for the comfortable use and
          occupation of the Premises, and (iii) janitorial services at the same
          level and frequency of service as is standard for other comparable
          buildings in the area, for which janitorial services Landlord shall
          contract with a third party service provider and the cost of which
          janitorial services shall be charged to Tenant as Additional Rent.
          Landlord shall provide HVAC service to the file server and computer
          lab 24 hours per day, seven days per week, which will require a
          installation and operation of a special HVAC system. The added cost of
          maintaining and operating such special HVAC system shall be paid by
          Tenant to Landlord as Additional Rent. The services described in this
          Section are, collectively, the "Service Obligations."

     11.2 Additional Services. The provision and use of such utilities and
          services shall be in accordance with any applicable rules and
          regulations under this Lease. If Tenant requires or utilizes more
          water or electrical power than is considered reasonable or normal by
          Landlord, Landlord may at its option require Tenant to pay, as
          Additional Rent, the cost, as fairly determined by Landlord, incurred
          in such extraordinary usage. In addition, Landlord may install
          separate meters in accordance with Section 11.4.

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<PAGE>

     11.3 After Hours. At Tenant's request, Landlord shall furnish, at Tenant's
          expense, heat and air conditioning outside of Normal Business Hours,
          at rates to be established from time to time by Landlord, and to be
          paid by Tenant as billed by Landlord.

     11.4 Separate Meters. To the extent that the Premises are separately
          metered or sub-metered for Tenant's use of any utilities or services,
          Tenant shall pay for such use in the same manner as Rent, or shall pay
          the cost thereof directly to the service provider, and in either event
          such charges shall constitute Additional Rent hereunder.

     11.5 Failure. In the event of any failure or interruption of such utilities
          and services, Landlord shall diligently attempt to resume service
          promptly. Tenant shall not be entitled to any abatement or reduction
          of Rent by reason of any failure or interruption of utilities or
          services, no eviction of Tenant shall result from any such failure or
          interruption, and Tenant shall not be relieved from the performance of
          any obligation in this Lease because of such failure or interruption.

12.  Limits on Landlord's Liability. Landlord's liability in respect of its
     Maintenance and Service Obligations is subject to the following
     limitations:

     12.1 Circumstances Beyond Control. Landlord shall not be liable for any
          failure of Maintenance Obligations or Service Obligations when such
          failure is caused by (i) strikes, lockouts or other labor disturbance
          or labor dispute of any character, (ii) governmental regulation,
          moratorium or other governmental action, (iii) inability despite the
          exercise of reasonable diligence to obtain electricity, water or fuel
          from the providers thereof, (iv) acts of God or (v) any other cause
          beyond Landlord's reasonable control.

     12.2 Unreasonable Period of Failure. Subject to Section 12.1, Landlord
          shall not be liable for any failure of Maintenance Obligations or
          Service Obligations, unless such failure shall persist for an
          unreasonable time after written notice of the need of such repairs or
          maintenance or of the interruption of services is given to Landlord by
          Tenant.

     12.3 Tenant Caused. If maintenance and repairs to the Premises, Building or
          Common Areas are caused in part or in whole by the act, neglect,
          fault, or omission of any duty by Tenant, its agents, servants,
          employees, or invitees, Tenant shall pay to Landlord the costs of such
          maintenance and repairs.

     12.4 No Abatement of Rent. Except as specifically provided in Sections 15
          and 16, there shall be no abatement of Rent in any circumstance under
          this Lease.

     12.5 No Interference. Landlord shall not be liable for any injury to or
          interference with Tenant's business arising from the making of any
          repairs, alterations, or improvements in or to any portion of the
          Building, the Premises, the Property, or the Common Areas, or to
          fixtures, appurtenances, and equipment therein, or the failure of
          Maintenance. Obligations or Service Obligations. Without limiting the
          generality of this Section 12, in no event shall Landlord have any
          liability for consequential damages resulting from any act or omission
          of Landlord in respect of its Maintenance Obligations or Service
          Obligations, even if Landlord has been advised of the possibility of
          such consequential damages.

13.  Alterations and Additions by Tenant; Liens and Insolvency.

     13.1 Alterations and Additions by Tenant. With the prior written consent of
          Landlord, Tenant may make at its expense additional improvements or
          alterations to the Premises. Any repairs or new construction by Tenant
          shall be done in conformity with plans and specifications approved by
          Landlord, by contractors approved by Landlord, (provided, that

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<PAGE>

          Landlord may require that such work be performed by Landlord's
          employees or contractor(s) employed by Landlord so long as the cost of
          such work is no more than 5% higher than any construction bid which is
          acceptable to Tenant) and subject to Landlord's reasonable rules and
          regulations regarding such construction. All work performed shall be
          done lien-free in a workmanlike manner and shall become the property
          of Landlord. Landlord may require that Tenant provide to Landlord, at
          Tenant's expense, a lien and completion bond in an amount equal to
          150% of the estimated cost of any improvements, additions, or
          alterations in the Premises. Landlord shall not unreasonably withhold
          or delay its consent to Tenant's proposed alterations or improvements
          if the conditions of this Section 13 are satisfied. Landlord may
          require Tenant to remove any improvements or alterations at the
          expiration or termination of the Term, provided that Landlord notifies
          Tenant, at the time Landlord, grants consent, that such alterations or
          improvements must be removed at the expiration or termination of the
          Term, such removal to occur at Tenant's expense; and Tenant shall
          repair all damage to the Premises or Building occurring as a result of
          such removal. In the event Tenant fails to remove any improvements or
          alterations as required by Landlord or repair any damage occurring
          during such removal, Landlord shall be entitled to remove any
          improvements or alterations or make such repairs, at Tenant's expense,
          and shall further be entitled to draw upon the Deposit

     13.2 Liens and Insolvency. Tenant shall keep the Premises, Building and
          Property free from any liens arising out of any work performed,
          materials ordered or obligations incurred by Tenant. Landlord shall
          have the right at all reasonable times to post on the Premises any
          notices which it deems necessary for its protection from such liens.
          If such liens are filed unless such liens are removed or bonded around
          to Landlord's satisfaction within fourteen (14) days of Landlord's
          notice to Tenant, Landlord may, without waiving its rights and
          remedies based on such breach by Tenant and without releasing Tenant
          from any of its obligations hereunder, cause such liens to be released
          by any means it shall deem proper, including payment in satisfaction
          of the claim giving rise to such lien. Tenant shall pay to Landlord on
          demand, any reasonable sum paid by Landlord to remove such liens,
          together with interest at the rate specified in Section 33.8.

 14.  Insurance; Indemnity.

     14.1 Tenant Waiver. Landlord shall not be liable to Tenant, and Tenant
          hereby waives all claims against Landlord, for injury or damage to any
          person or property in or about the Premises, Building, Property or
          Common Areas by or from any cause whatsoever, including without
          limitation any acts or omissions of any other tenants, licensees or
          invitees of the Building.

     14.2 Indemnity. Tenant shall indemnify and defend (using legal counsel
          acceptable to Landlord) Landlord and hold Landlord harmless, from and
          against any and all loss, cost, damage, liability and expense
          (including reasonable attorneys' fees) whatsoever that may arise out
          of or in connection with Tenant's occupation, use or improvement of
          the Premises, or that of its employees, agents or contractors, or
          Tenant's breach of its obligations under this Lease. To the extent
          necessary to fully indemnify Landlord from claims made by Tenant or
          its employees, this indemnify constitutes a waiver of Tenant's
          immunity under the Washington Industrial Insurance Act, RCW Title 51.
          This indemnity shall survive the expiration or termination of the
          Term.

     14.3 Landlord's Responsibility. The exculpation, release and indemnity
          provisions of Sections 14.1 and 14.2 shall not apply to the extent the
          subject claims thereunder were caused by Landlord's gross negligence
          or willful misconduct. However, in no event shall Landlord be liable
          to Tenant for consequential damages.

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<PAGE>

     14.4 Tenant's Insurance. Tenant shall procure and maintain throughout the
          Term at Tenant's expense, the following insurance:

          14.4.1 Comprehensive general public liability insurance, insuring
               Tenant against liability arising out of the Lease and the use,
               occupancy, or maintenance of the Premises and all areas
               appurtenant thereto. Such insurance shall be in the amount of not
               less than $3,000,000 combined single limit for injury to or death
               of one or more persons in an occurrence, and for damage to
               tangible property (including loss of use) in an occurrence (or in
               such amount as Landlord determines in its reasonable discretion).
               Such policy shall insure the operations of independent
               contractors and contractual liability (covering the indemnity in
               Section 14.2) and shall: (i) name Landlord as an additional
               insured, and (ii) provide that it is primary and noncontributing
               with any insurance in force or on behalf of Landlord.

          14.4.2 Standard form property insurance insuring against the perils of
               fire, extended coverage, vandalism, malicious mischief, special
               extended coverage ("All-Risk") and sprinkler leakage. This
               insurance policy shall be upon all personal property for which
               Tenant is legally liable or that was installed at Tenant's
               expense, and that is located in the Building or Premises,
               including without limitation all Tenant's furnishings, fixtures,
               furniture, fittings, and equipment and all improvements to the
               Premises installed by Tenant, in an amount not less than 90% of
               the full replacement cost thereof. In the event of a dispute as
               to the amount of full replacement cost, the decision of Landlord
               or any mortgagees of Landlord shall be conclusive. Such policy
               shall also include business interruption coverage, covering
               direct and indirect loss of Tenants earnings attributable to
               Tenant's inability to use fully or obtain access to the Premises
               or Building, in an amount as will properly reimburse Tenant. Such
               policy shall name Landlord and any mortgagees of Landlord as
               insured parties, as their respective interests may appear.

          14.4.3 Workman's Compensation and Employer's Liability Insurance (as
               required by state law).

          14.4.4 Any other form or forms of insurance as Tenant or Landlord or
               any mortgagees of Landlord may reasonably require from time to
               time in form, in amounts and for insurance risks against which a
               prudent tenant would protect itself.

     14.5 Policies. All policies of insurance to be obtained by Tenant hereunder
          shall be in a form satisfactory to Landlord and shall be issued by
          insurance companies holding a General Policyholder Rating of "A" and a
          Financial Rating of "X" or better in the most current issue of Best's
          Insurance Guide. Tenant shall provide Landlord with certificates of
          such insurance. No such policy shall be cancelable or reducible in
          coverage except after 30 days' prior written notice to Landlord.
          Tenant shall, within ten days prior to the expiration of such
          policies, furnish Landlord with renewals or "binders" thereof, or
          Landlord may order such insurance and charge the cost thereof to
          Tenant as Additional Rent.

     14.6 Landlord's Insurance. Landlord shall maintain liability and casualty
          insurance for the Building and Property adequate in Landlord's
          judgment to cover (with deductibles deemed appropriate by Landlord)
          the risks customarily insured against by owners of properties similar
          to the Building.

     14.7 Proceeds. The proceeds of any insurance policies maintained by or for
          the benefit of Landlord shall belong to and be paid over to Landlord.
          Any interest or right of Tenant in any such proceeds shall be subject
          to Landlord's interest and right in such proceeds.

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     14.8 Waiver of Subrogation. Anything in this Lease to the contrary
          notwithstanding, Tenant and Landlord each waives its entire right of
          recovery, claims, actions, or causes of action against the other for
          loss or damage to the Premises, Building, or Property or any personal
          property of such party therein that is caused by or incident to the
          perils covered by normal extended coverage clauses of standard fire
          insurance policies carried by the waiving party and in force at the
          time of damage or loss. Tenant and Landlord each waives any right of
          subrogation it may have against the other party to the extent of
          recovery under any such insurance, and shall cause each insurance
          policy obtained by it to provide that the insurance company waives all
          right to recovery by way of subrogation against the other party in
          connection with any such loss or damage. If either Landlord or Tenant
          is unable to obtain its insurer's permission to waive any claim
          against the other party, such party shall promptly notify the other
          party of such inability.

     14.9 Notification of Accidents. Tenant shall promptly notify Landlord of
          any casualty or accident occurring in or about the Premises.

15.  Destruction.

     15.1 Election to Restore. If the Premises or the Building is destroyed by
          fire, earthquake, or other casualty to the extent that they are
          untenantable in whole or in part, then Landlord shall have the right
          but not the obligation to proceed with reasonable diligence to rebuild
          and restore the Premises or the Building or such part thereof.
          Landlord shall within 30 days after such destruction or injury notify
          Tenant whether Landlord intends to rebuild. If Landlord fails to
          notify Tenant within such period, then this Lease shall terminate as
          of the end of such period.

     15.2 Rent Abatement. During the period from destruction or damage until
          restoration (or termination of this Lease), Rent shall be abated in
          the same ratio as that portion of the Premises which Landlord
          determines is unfit for occupancy shall bear to the whole Premises. If
          damage is due to the fault or neglect of Tenant or its agents,
          employees, invitees, or licensees, there shall be no abatement of
          Rent.

     15.3 Repairs to Tenant Installations. Landlord shall not be required to
          repair any injury or damage by fire or other cause, or to make any
          repairs or replacements of any panels, decoration, office fixtures,
          paintings, floor covering, or any other improvements to the Premises
          installed by Tenant. Instead, if Landlord repairs or rebuilds the
          Premises under this Section 15, Tenant shall repair or rebuild such
          Tenant-installed improvements and other items of property

     15.4 No Compensation. Tenant shall not be entitled to any compensation or
          damages from Landlord for loss of the use of the whole or any part of
          the Premises, the property of Tenant, or any inconvenience or
          annoyance occasioned by such damage, repair, reconstruction, or
          restoration.

16.  Condemnation.

     16.1 Termination of Lease. If all or part of the Premises are taken under
          power of eminent domain, or sold under the threat of the exercise of
          said power, this Lease shall terminate as to the part so taken as of
          the date the condemning authority takes possession.

     16.2 Election of Termination. If more than 15% of the floor area of
          Premises is taken by condemnation, Landlord or Tenant may, by written
          notice to the other within ten days after notice of such taking,
          terminate this Lease as to the remainder of the Premises as of the
          date the condemning authority takes possession.

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     16.3 Reduction of Rent. If Landlord or Tenant does not so terminate, this
          Lease shall remain in effect as to such remainder, except that the
          Rent shall be reduced in the proportion that the rentable floor area
          taken bears to the original rentable total floor area. However, if
          circumstances make abatement based on floor area unreasonable, the
          Rent shall abate by a reasonable amount to be determined by Landlord.
          In the event that neither Landlord nor Tenant elects to terminate this
          Lease, Landlord's responsibility to restore the remainder of the
          Premises shall be limited to the amount of any condemnation award
          allocable to the Premises, as determined by Landlord.

     16.4 Award. Any award for the taking of all or part of the Premises under
          the power of eminent domain, including payment made under threat of
          the exercise of such power, shall be the property of Landlord, whether
          made as compensation for diminution in value of the leasehold or for
          the taking of the fee or as severance damages. Tenant shall only be
          entitled to such compensation as may be separately awarded or
          recoverable by Tenant in Tenant's own right for the loss of or damage
          to improvements to the Premises installed by Tenant, for Tenant's
          trade fixtures and removable personal property and for Tenant's
          relocation or moving expenses. Landlord shall not be liable to Tenant
          for the loss of the use of all or any part of the Premises taken by
          condemnation.

     16.5 Landlord Aothoritv. Landlord Shall have the exclusive authority to
          grant possession and use to the condemning authority and to negotiate
          and settle all issues of just compensation or, in the alternative, to
          conduct litigation concerning such issues; provided, however, that
          Landlord shall not enter into any settlement of any separate award
          that may be made to Tenant as described in Section 16.4 without
          Tenant's prior approval of such settlement, which approval shall not
          be unreasonably withheld.

17.  Assignment and Subletting.

     17.1 Landlord Consent Required. Tenant shall not assign this Lease, or
          sublet the Premises or any part thereof, either by operation of law or
          otherwise, or permit any other party to occupy all or any part of the
          Premises, without first obtaining the written consent of Landlord.
          Tenant shall propose such assignment or sublease by written notice to
          Landlord, and such notice shall specify an effective date. This Lease
          shall not be assignable by operation of law. Tenant shall further
          provide to Landlord other information and creditworthiness materials
          concerning any proposed assignee or sublessee and its proposed use of
          the Premises as is requested by Landlord. Landlord shall approve or
          disapprove such assignment or sublease within 15 business days of
          Landlord's receipt of all such information requested by Landlord.
          Landlord's consent to a proposed assignment or sublease shall not be
          unreasonably withheld or delayed; provided, however, that Landlord's
          rejection of any proposed subtenant or assignee based upon Landlord's
          determination, in the exercise of its good faith judgment, that the
          proposed subtenant or assignee is not creditworthy, or that use of the
          Premises by such proposed subtenant or assignee is inconsistent or
          incompatible with the uses then allowed in the Business Park shall not
          be deemed to be an unreasonable withholding of Landlord's consent.
          Notwithstanding any assignment of this Lease or subletting of the
          Premises, Great Plains Software O.C., Inc. shall remain fully liable
          for any and all obligations and liabilities of Tenant under this
          Lease.

     17.2 Deemed Assignment. If Tenant is a corporation, any transfer of this
          Lease from Tenant by merger, consolidation, or liquidation, or any
          change in the ownership of or power to vote 50% or more of the
          outstanding voting stock of Tenant shall constitute an assignment
          under this Lease. If Tenant is a partnership or limited liability
          company, any change in the identity or majority ownership of partners
          or members in Tenant serving as general partner or manager or owning
          50% or more of the outstanding economic interests

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          in such entity shall constitute an assignment under this Lease. The
          provisions of this Section 17.2 shall not apply if Tenant's stock is
          listed on a recognized security exchange or if at least eighty percent
          (80%) of its stock is owned by a corporation whose stock is listed on
          a recognized security exchange.

     17.3 Recapture. In the alternative to consenting to a proposed assignment
          or sublease, Landlord shall have the right to recapture the Premises,
          or applicable portion thereof. Landlord may exercise such right by
          notice to Tenant within ten business days after receipt of Tenant's
          notice. Such recapture shall terminate this Lease as to the applicable
          portion of the Premises effective on the effective date proposed in
          Tenant's notice.

     17.4 Additional Requirements. If Landlord elects not to recapture and
          thereafter elects to gives its consent to the proposed assignment or
          sublease, (i) Landlord may charge Tenant a reasonable sum to reimburse
          Landlord for legal and administrative costs incurred in connection
          with such consent; (ii) in the event of a sublease, Landlord and
          Tenant shall share equally in any rent and other proceeds paid to
          Tenant in excess of the Rent to be paid to Landlord under this Lease,
          less any reasonable leasing costs, including but not limited to tenant
          improvement costs, leasing commissions and legal fees; and (iii) in
          the event of an assignment or a sublease, Tenant shall remain liable
          to Landlord for the performance of all of Tenant's obligations under
          this Lease.

     17.5 Assignment with Bankruptcy. If this Lease is assigned pursuant to the
          provisions of the Revised Bankruptcy Act, 11 U.S.C. Section 101 et
          seq., any and all consideration paid or payable in connection with
          such assignment shall be Landlord's exclusive property and paid or
          delivered to Landlord, and shall not constitute the property of tenant
          or tenant's estate in bankruptcy. Any person or entity to whom the
          Lease is assigned pursuant to the Revised Bankruptcy Act shall, be
          deemed automatically to have assumed all of Tenants obligations under
          this Lease.

     17.6 Sale. In the event of any sale of the Building or Property, or any
          assignment of this Lease by Landlord, Landlord shall be relieved of
          all liability under this Lease arising out of any act, occurrence, or
          omission occurring after sale or assignment; and the purchaser or
          assignee at such sale or assignment or any subsequent sale or
          assignment of Lease, the Property, or Building, shall be deemed
          without any further agreement to have assumed all of the obligations
          of the Landlord under this Lease accruing after the date of such sale
          or assignment.

     17.7 Binding. Subject to the provisions of this Section 17, this Lease
          shall be binding upon and inure to the benefit of the parties, their
          heirs, successors and assigns.

18.  Default

     18.1 Definition of Default. The occurrence of any one or more of the
          following events shall constitute a material default and breach of the
          Lease by Tenant ("Default"):

          18.1.1 vacation or abandonment of the entire Premises for 12 or more
               consecutive months;

          18.1.2 failure by Tenant to make any payment required as and when due,
               where such failure shall continue after five days' written notice
               from Landlord;

          18.1.3 failure by Tenant to observe or perform any of the covenants,
               conditions, or provisions of this Lease, other than the making of
               any payment, where such failure shall continue after 30 days'
               written notice from Landlord; provided,

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               however, that if the nature of Tenant's obligation is such that
               more than 30 days are required for performance, Tenant shall not
               be in default if Tenant commences performance within 30 days
               after Landlord's notice and thereafter completes such performance
               diligently and within a reasonable time; or

          18.1.4 (i) the making by Tenant of any general assignment or general
               arrangement for the benefit of creditors; (ii) the filing by or
               against Tenant of a petition in bankruptcy, including
               reorganization or arrangement, unless, in the case of a petition
               filed against Tenant, the same is dismissed within 30 days;
               (iii) the appointment of a trustee or receiver to take possession
               of substantially all of Tenant's assets located at the Premises
               or of Tenant's interest in this Lease; (iv) the seizure by any
               department of any government or any officer thereof of the
               business or property of Tenant; and (v) adjudication that Tenant
               is bankrupt.

     18.2 Tenant Notification. Tenant shall notify Landlord promptly of any
          Default by Tenant (or event or occurrence which, with the passage of
          time, the giving of notice, or both, would become a Default) that by
          its nature is not necessarily known to Landlord.

     18.3 Landlord Default. Landlord shall be in default if it fails to observe
          or perform any of the covenants, conditions, or provisions of this
          Lease, where such failure shall continue after 30 days' written notice
          from Tenant; provided, however, that if the nature of Landlord's
          obligation is such that more than 30 days are required for
          performance, Landlord shall not be in default if Landlord commences
          performance within 30 days after Tenant's notice and thereafter
          completes such performance diligently and within a reasonable time.
          Tenant shall copy Landlord's lender with any such notice of default,
          if Tenant has been provided with the name and address of any such
          lender. In no event shall a default by Landlord under this Lease give
          rise to any right of Tenant to terminate this Lease or withhold or
          offset the payment of Base Monthly Rent or Additional Rent. The
          obligations of Tenant to pay Base Monthly Rent and Additional Rent
          shall continue unaffected in all events unless suspended or terminated
          pursuant to an express provision of this Lease.

     18.4 [Intentionally deleted.]

19.  Remedies in Default

     19.1 Landlord Remedies. In the event of any Default by Tenant, Landlord
          may, at any time without waiving or limiting any other right or
          remedy, do any one or more of the following: (i) re-enter and take
          possession of the Premises without terminating this Lease, or (ii)
          terminate this Lease, and (iii) pursue any remedy allowed by law or
          equity.

     19.2 Tenant Payment of Costs. Whether Landlord has elected to terminate
          this Lease or not, Tenant agrees to pay Landlord the reasonable cost
          of recovering possession of the Premises, the expenses of reletting,
          and any other costs or damages arising out of Tenants Default,
          including without limitation the reasonable costs of removing persons
          and property from the Premises, the reasonable costs of preparing or
          altering the Premises for reletting, broker's commissions, and
          attorneys' fees.

     19.3 Termination. In the event Landlord elects to terminate this Lease,
          Landlord shall be additionally entitled to recover from Tenant: (i)
          the award by a court having jurisdiction thereof of the amount by
          which the unpaid rent and other charges and adjustments called for
          herein for the balance of the term after the time of such award
          exceeds the amount of such loss for the same period that Tenant proves
          could be reasonably avoided and (ii) that portion of any leasing
          commission and Tenant Improvements costs paid by Landlord applicable
          to the unexpired term of the Lease.

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     19.4 No Termination. No re-entry or taking possession of the Premises by
          Landlord pursuant to this Section 19, or acceptance of Tenant's keys
          to or surrender of the Premises shall be construed as an election to
          terminate this Lease unless a written notice of such intention is
          given to Tenant. Notwithstanding any reentry or termination, the
          liability of Tenant for the Rent shall continue for the balance of the
          Term, and Tenant shall make good to Landlord any deficiency arising
          from reletting the Premises at a lesser rent than the Rent provided
          for in this Lease. Tenant shall pay such deficiency each month as the
          amount thereof is ascertained by Landlord.

     19.5 Landlord Election to Make Tenant Advances. If Tenant shall fail to pay
          any sum of money owed to any party other than Landlord, for which
          Tenant is liable under this Lease, or if Tenant shall fail to perform
          any other act on its part to be performed hereunder, and such failure
          continues for a period of ten days after notice thereof by Landlord,
          Landlord may, without waiving or releasing Tenant from its obligations
          or waiving or releasing any rights that Landlord may have, make any
          such payment or perform any other act to be made or performed by
          Tenant. All sums so paid by Landlord and all necessary incidental
          costs, together with interest thereon at the rate established in
          Section 33.8, from the date of such payment by Landlord, shall be
          deemed Additional Rent and shall be paid to Landlord on demand.

20.  Access. Tenant shall permit Landlord to enter the Premises at all
     reasonable times with reasonable advance notice to Tenant (except in case
     of emergency, in which case no notice is required) for the purpose of
     inspecting, altering, and repairing the Premises and the Building and
     ascertaining compliance with the provisions of this Lease by Tenant. The
     existence or exercise of such right of access shall not be construed as
     imposing any obligation on Landlord to inspect, discover or correct or
     repair any condition in the Premises or the Building. Landlord may also
     show the Premises to prospective purchasers or tenants at reasonable times,
     provided that Landlord shall not materially interfere with Tenant's
     business operation.

21.  Surrender of Premises: Hold-Over Tenancy.

     21.1 Surrender of Premises. Upon the expiration or sooner termination of
          this Lease, Tenant shall surrender the Premises and all the additions
          and alterations thereto, and leave the Premises broom clean and in
          good order and condition and repair, excluding ordinary wear and tear.

     21.2 Hold-Over Tenancy. If without execution of a new Lease or written
          extension Tenant shall hold over after the expiration or termination
          of the Term, with Landlord's written consent. Tenant shall be deemed
          to be occupying the Premises as a Tenant from month to month, which
          tenancy may be terminated as provided by law, unless the parties agree
          otherwise at the time of Landlord's consent. If Tenant shall hold over
          after expiration or termination of the Term without Landlord's written
          consent, the Base Monthly Rent payable shall be 125% of the Base
          Monthly Rent payable in the last month prior to expiration or
          termination of the Term, and Tenant shall continue to pay Additional
          Rent. During any such tenancy, Tenant shall continue to be bound by
          all of the terms, covenants, and conditions of this Lease, insofar as
          applicable.

22.  Compliance with Law. Tenant shall not use the Premises or permit anything
     to be done in or about the Premises which will in any way conflict with any
     applicable law, statute, ordinance, or governmental rule or regulation, now
     or hereafter in force ("Laws"). Tenant shall at its sole cost and expense
     promptly comply with all Laws, including without limitation the Americans
     with Disabilities Act, and with the requirements of any board of fire
     insurance underwriters or other similar bodies now or hereafter
     constituted, relating to, or affecting the use or occupancy of the
     Premises. The judgment of any court of competent jurisdiction, or the
     admission of Tenant in any

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     action, whether Landlord be a party thereto or not, that Tenant has
     violated any Laws, shall be conclusive of the fact as between Landlord and
     Tenant.

23.  Rules and Regulations. Tenant shall faithfully observe and comply with the
     rules and regulations that Landlord shall from time to time promulgate and
     with and the CC&Rs and any other restrictive covenants and obligations
     created by private contracts which affect the use and operation of the
     Premises, Building, Common Areas or Business Park now or hereafter in
     force. All such rules and regulations shall be non-discriminatory and
     reasonable and shall be uniformly and consistently enforced against all
     tenants in the Building. Additions and modifications to rules and
     regulations shall be binding on Tenant upon delivery of a copy of them to
     Tenant. Landlord shall not be responsible to Tenant for the nonperformance
     of any rules or regulations by any other tenants or occupants of the
     Building.

24.  Parking. Tenant shall have the right to use, on a first-come, first served
     basis, in common with other tenants and occupants of the Building, up to
     the number of parking stalls specified in Section 1, located on the
     Property and which shall be available for use by all tenants of the
     Building, their guests and invitees, but which may, at Landlord's election,
     be designated by Landlord (which designated parking facilities Landlord may
     change at any time and from time to time in its sole discretion), subject
     to the rules and regulations and any charges that may be established or
     altered for such parking facilities from time to time. Tenant shall comply
     with any and all private and governmentally imposed parking restrictions
     applicable to the Building or Property, including without limitation, the
     requirements of all designations placed on parking stalls located on the
     Property, such as car pool, visitor and designation for any tenant of the
     Building.

25.  Estoppel Certificates. Tenant shall execute, within ten business days
     following Landlord's request, a certificate in such reasonable form as may
     be required by Landlord or a prospective purchaser, mortgagee or trust deed
     beneficiary, or Landlord's successor after a sale or foreclosure,
     certifying: (i) the Commencement Date of this Lease, (ii) that the Lease is
     unmodified and in full force and effect, (or if there have been
     modifications hereto, that this Lease is in full force and effect, and
     stating the date and nature of such modifications); (iii) that there have
     been no current defaults under this Lease by either Landlord or Tenant
     except as specified in Tenant's statement, (iv) the dates to which the Base
     Monthly Rent, Additional Rent and other charges have been paid, and (v) any
     other information reasonably requested by the requesting party. Such
     certificate may be relied upon by Landlord and/or such other requesting
     party. Tenant's failure to deliver such statement within such time shall be
     conclusive upon Tenant that this Lease is in full force and effect, without
     modification except to the extent represented by Landlord, that there are
     no uncured defaults in Landlord's performance under this Lease, and that
     not more than one month's Rent has been paid in advance. Tenant's failure
     to deliver said statement within ten business days of request, shall
     constitute Tenant's Default.

26.  Subordination. Tenant agrees that this Lease shall be subordinate to the
     lien of any mortgage, deeds of trust, or ground leases now or hereafter
     placed against the Property or Building, and to all renewals and
     modifications, supplements, consolidations, and extensions thereof.
     Notwithstanding the foregoing, Landlord reserves the right, however, to
     subordinate or cause to be subordinated any such mortgage, deed of trust or
     ground lease to this Lease. Upon a foreclosure or conveyance in lieu of
     foreclosure under such mortgage or deed of trust, or a termination of such
     ground lease, and a demand by Landlord's successor, Tenant shall attorn to
     and recognize such successor as Landlord under this Lease; provided,
     however, that Landlord shall obtain for the Term of this Lease what is
     commonly known as a "nondisturbance" agreement which is intended to protect
     Tenant's right to possession under this Lease for so long as Tenant
     complies with the terms of this Lease and which shall be in such standard
     form and substance as the lender or ground lessor at that time typically
     provides to comparable tenants. Landlord shall use reasonable efforts to
     obtain modifications to such standard nondisturbance agreements as Tenant
     may reasonably request. Tenant shall execute and deliver on request and in
     the form

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     requested by Landlord, any instruments reasonably necessary or appropriate
     to evidence, effect or confirm such subordination.

27.  Removal of Property. On expiration or other termination of this Lease,
     Tenant shall remove (i) all personal property of Tenant on the Premises,
     including without limitation all Tenant's furnishings, fixtures, furniture,
     fittings, cabling, wiring and equipment; and (ii) those improvements to the
     Premises installed by or at the expense of Tenant which Landlord previously
     notified Tenant in accordance with Section 13.1 would need to be removed
     upon expiration or termination of the Lease. All other improvements shall
     become the property of Landlord under Section 13. Tenant shall repair or
     reimburse Landlord for the cost of repairing any damage to the Premises
     resulting from the installation or removal of such property of Tenant. All
     property of Tenant remaining on the Premises after reentry or termination
     of this Lease shall conclusively be deemed abandoned and may be removed by
     Landlord. The cost of removal of such property shall be reimbursed by
     Tenant to Landlord upon demand, including, but not limited to court costs,
     reasonable attorneys' fees and storage and disposal charges relating to
     such property. Landlord may store such property of Tenant in any place
     selected by Landlord, including but not limited to a public warehouse, at
     the expense and risk of the owner thereof, with the right to sell such
     stored property without notice to Tenant. The proceeds of such sale shall
     be applied first to the cost of such sale, second to the payment of the
     cost of removal and storage, if any, and third to the payment of any other
     amounts that may then be due from Tenant to Landlord under this Lease, and
     any balance shall be paid to Tenant.

28.  Personal Property Taxes. Tenant shall pay prior to delinquency all personal
     property taxes payable with respect to all property of Tenant located on
     the Premises or the Building and promptly upon request of Landlord shall
     provide satisfactory evidence of such payment. "Personal property taxes"
     under this Section 2B shall include all property taxes assessed against the
     property of Tenant, whether assessed as real or personal property.

29.  Notices. All notices under this Lease shall be in writing. Notices shall be
     effective (i) three days after being mailed by certified mail, return
     receipt requested (ii) when personally delivered, or (iii) when sent by
     fax, in each case to the address or fax number of the receiving party set
     forth in Section 1. Either party may change its address and fax number for
     notices by notice to the other from time to time.

30.  Condition of Premises. Subject to the punch list items identified in the
     Work Letter, by taking possession of the Premises, Tenant accepts the
     Premises as being in good, sanitary order, condition and repair, and
     further accepts all aspects of the Premises, Building, Property and
     Business Park in their present condition, AS IS, including latent defects,
     without any representations or warranties, express or implied, from
     Landlord.

31.  Hazardous Substances.

     31.1 Tenant Obligations. Tenant shall not, without first obtaining
          Landlord's prior written approval, generate, release, store, deposit,
          transport, or dispose of (collectively "Release") any hazardous
          substances, sewage, petroleum products, hazardous materials, toxic
          substances or any pollutants or substances, defined as hazardous or
          toxic in applicable federal, state and local laws and regulations
          ("Hazardous Substances") in, on or about the Premises. In the event,
          and only in the event, Landlord approves such Release of Hazardous
          Substances on the Premises, such Release shall occur safely and in
          compliance with all applicable federal, state, and local laws and
          regulations.

     31.2 Tenant Indemnity. Tenant shall indemnify and defend (with counsel
          approved by Landlord) Landlord, and hold Landlord harmless, from and
          against any and all claims, liabilities, losses, damages, cleanup
          costs, and expenses (including reasonable attorneys'

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<PAGE>

          fees) arising out of or in any way relating to the Release by Tenant
          or any of its agents, representatives, employees or invitees, or the
          presence of any Hazardous Substances in, on or about the Premises
          occurring as a result of or in connection with Tenant's use or
          occupancy of the Premises at any time after the Commencement Date.

     31.3 Landlord Inspection. Landlord shall have the right from time to time
          to enter the Premises, Building and Property and inspect the same for
          the presence of Hazardous Substances and compliance with the
          provisions of this Section 31 and inspect the Premises, Building and
          Property. Landlord may cause tests to be performed for Hazardous
          Substances on the Premises from time to time. Tenant shall bear the
          cost of the first such test in any calendar year and any other such
          test that occurs upon a reasonable suspicion by Landlord that there
          may be Hazardous Substances in the Premises in violation of Tenant's
          obligations under this Lease.

     31.4 Survival. The provisions of this Section 31 shall survive the
          expiration or termination of this Lease with respect to any
          occurrences during the Term.

32.  Signs. Except as permitted under the terms of Section 1 A.5, Tenant shall
     not place upon or install in windows or other openings or exterior sides of
     doors or walls of the Premises any symbols, drapes, or other materials
     without the written consent of Landlord. Tenant shall observe and comply
     with the requirements of all Laws applicable to signage.

33.  General Provisions.

     33.1 Attorneys' Fees. In the event Landlord reasonably requires the
          services of any attorney in connection with any Default or violation
          by Tenant of the terms of this Lease or the exercise by Landlord of
          its remedies for any Default by Tenant under this lease, or a request
          by Tenant for Landlord's waiver of any terms of this Lease or
          extension of time to perform or pay any obligation of Tenant under
          this Lease, Tenant shall promptly on demand reimburse Landlord for its
          reasonable attorneys' fees incurred in such instance. In the event of
          any litigation, arbitration or other proceeding (including proceedings
          in bankruptcy and probate and on appeal) brought to enforce or
          interpret or other wise arising under this Lease, the substantially
          prevailing party therein shall be entitled to the award of its
          reasonable attorneys' fees, witness fees, and court costs incurred
          therein and in preparation therefor.

     33.2 Governing Law; Venue. This Lease shall be governed by and construed in
          accordance with the laws of the State of Washington and venue for all
          disputes shall be in King County, Washington.

     33.3 Cumulative Remedies. No remedy or election under this Lease shall be
          deemed exclusive but shall, wherever possible, be cumulative with all
          other remedies at law or in equity.

     33.4 Exhibits; Addenda. Exhibits and Addenda, if any, affixed to this Lease
          are a part of and incorporated into this Lease.

     33.5 Interpretation. This Lease has been submitted to the scrutiny of all
          parties hereto and their counsel, if desired, and shall be given a
          fair and reasonable interpretation in accordance with the words
          hereof, without consideration or weight being given to its having been
          drafted by any party hereto or its counsel.

     33.6 Joint Obligation. If there is more than one Tenant under this Lease,
          the obligations hereunder imposed upon Tenants shall be joint and
          several.

                                       23

<PAGE>

     33.7 Keys/Premises Information. Within ten (10) days after expiration or
          termination of this Lease, Tenant shall (a) surrender all keys and
          access cards to the Premises, Building and Garage to Landlord at the
          place then fixed for payment of Rent (b) to the extent in Tenant's
          possession, deliver to Landlord any plans, drawing and specifications
          (including any cabling or wiring diagrams) that relate to the Premises
          or any improvements or alterations made by Tenant therein, and (c)
          inform Landlord of all combination locks, safes, and vaults, if any,
          in the Premises.

     33.8 Late Charges; Interest. Late payment by Tenant to Landlord of Rent or
          other sums due under this Lease will cause Landlord to incur costs not
          contemplated by this Lease, the exact amount of which would be
          difficult and impractical to ascertain. Such costs include without
          limitation processing and accounting charges and late charges which
          may be imposed on Landlord by the terms of any mortgage or trust deed
          covering the Premises. Accordingly, Tenant shall pay to Landlord as
          Additional Rent a late charge equal to five percent of such
          installment as liquidated damages for such late payment, other than
          for time value damages. A $50.00 charge will be paid by Tenant to
          Landlord for each returned check. In addition, any Rent or other sums
          due under this Lease to Landlord that is not paid when due shall bear
          interest at the rate per annum of two percent over the prime rate in
          effect at Bank of America d/b/a Seattle-First National Bank, Seattle
          Head Office, on the day such Rent or other sum was due, which interest
          shall constitute Additional Rent under this Lease. The existence or
          payment of charges and interest under this Section shall not cure or
          limit Landlord's remedies for any Default by Tenant under this Lease.

     33.9 Light, Air, and View. Landlord does not guarantee the continued
          present status of light, air, or view in, to or from the Premises.

     33.10 Measurements. All measurements of the Premises stated in this Lease,
          even if approximations, shall govern and control over any actual
          measurement of the Premises and reflect the inclusion of a load factor
          for the Building. The Rent provided in this Lease and Tenant's Share
          shall not be modified or changed by reason of any measurement or
          re-measurement of the Premises that may occur after the date of this
          Lease, and is agreed by Landlord and Tenant to constitute the
          negotiated rent for the Premises. The foregoing shall not be deemed to
          modify any obligation of Landlord to construct the Premises in
          accordance with the Work Letter.

     33.11 Name. Tenant shall not use the name of the Building or Business Park
          for any purpose other than as an address of the business conducted by
          the Tenant in the Premises. The name of the Building or Business Park
          may at any time be changed by Landlord.

     33.12 Prior Agreements; Amendments. This Lease is the full, final and
          complete expression of the agreements of the parties with respect to
          any matter covered or mentioned in this Lease, and no prior agreements
          or understandings, promises or representations, oral or otherwise,
          pertaining to any such matters shall be effective for any purpose. No
          provision of this Lease may be amended or added to except by an
          agreement in writing signed by the parties or their respective
          successors in interest. This Lease shall not be effective or binding
          on any party until fully executed by both parties hereto.

     33.13 Recordation. Tenant shall not record this Lease or a short form
          memorandum of this Lease without the prior written consent of
          Landlord.

     33.14 Liability. Tenant agrees to look only to the equity of Landlord in
          the Building and Property and not to Landlord personally with respect
          to any obligations or payments due or which may become due from
          Landlord hereunder, and no other property or assets of Landlord

                                       24

<PAGE>

          or any partners, officers, directors, of Landlord shall be personally
          liable in connection with this Lease.

     33.15 Severability. That any provision of this Lease is invalid, void, or
          illegal shall in no way affect, impair, or invalidate any other
          provision of this Lease and such other provision shall remain in full
          force and effect.

     33.16 Time. Time is of the essence of this Lease and each of its
          provisions.

     33.17 Waiver. No provision of this Lease shall be deemed to have been
          waived by Landlord unless such waiver is in writing signed by
          Landlord's duly authorized representatives. The waiver by either party
          of any provision of this Lease shall not be deemed to be a waiver of
          such provision or any other provision, in any subsequent instance. The
          acceptance of Rent by Landlord shall not be deemed to be a waiver of
          any preceding Default or breach by Tenant under this Lease, whether
          known or unknown to Landlord, other than the failure of the Tenant to
          pay the particular Rent so accepted.

     33.18 No Waste. Tenant shall not commit or suffer to be committed any
          waste, damage or nuisance in or upon the Premises.

     33.19 Force Majeure. If either party shall be prevented or delayed from
          punctually performing any obligation or satisfying any condition under
          this Lease, other than the payment of Rent or other sums due
          hereunder, by any strike, lockout, labor dispute, inability to obtain
          labor or materials or reasonable substitutes therefor, acts of God,
          governmental restriction, regulation or control, enemy or hostile
          governmental action, civil commotion, insurrection, sabotage, fire or
          other casualty, or any other condition beyond the reasonable control
          of such party, then the time to perform such obligation or satisfy
          such condition shall be extended by the delay cause by, such event. If
          either party shall, as a result of any such event, be unable to
          exercise any right or option within any time limit provided therefor
          in this Lease, such time limit shall be deemed extended for a period
          equal to the duration of the delay caused by such event.

     33.20 Quiet Enjoyment. Provided Tenant observes its obligations under this
          Lease, its quiet enjoyment of the Premises throughout the Term shall
          not be disturbed.

34.  Authority of Tenant.

     34.1 Tenant as Corporation. If Tenant is a corporation, each individual
          executing this Lease on behalf of Tenant represents and warrants that
          (s)he is duly authorized by all necessary action of the directors of
          Tenant to execute and deliver this Lease on behalf of Tenant, and that
          this Lease is binding upon Tenant in accordance with its terms.

     34.2 Tenant as Partnership or LLC. If tenant is a partnership or limited
          liability company, each individual executing this Lease on behalf of
          Tenant represents and warrants that (s)he is duly authorized in
          accordance with Tenant's partnership agreement or limited liability
          company agreement by all necessary action of the partners or members
          or managers of Tenant to execute and deliver this Lease on behalf of
          Tenant, and, and that this Lease is binding upon Tenant in accordance
          with its terms.

35.  Financial Statements. Tenant shall furnish to Landlord from time to time,
     within 30 days of request, Tenant's most recent financial statements,
     including at a minimum a balance sheet, income statement and statement of
     cash flows, or the equivalent, dated as of and for a period ending not more
     than one quarter prior to the date of delivery. If Tenant is a
     publicly-traded company, such statements may be in the same form as filed
     with the appropriate governmental

                                       25

<PAGE>

     authorities and may be in the form of the last filed annual statement as
     opposed to the last quarterly statement. If Tenant is not a publicly-traded
     company, such statements shall be in the form furnished to Tenant's
     principal lender and/or to Tenant's shareholders or other owners, but at a
     minimum shall be reviewed or compiled by an independent certified public
     accountant. If Tenant is not a publicly-traded company, Tenant shall
     accompany such statements with a certificate of its chief financial officer
     that the statements fairly present the financial condition and results of
     operations of Tenant as of and for the period ending on the date of such
     statements. Landlord shall not request financial statements under this
     Section more than once each calendar year.

36.  Commissions. Any commissions payable as a result of the execution of this
     Lease shall be paid pursuant to a separate commission contract. Each party
     represents and warrants to the other that it has not had dealings with any
     real estate broker other than the Broker identified in Section 1, agent or
     salesperson with respect to this Lease that would cause the other party to
     have any liability for any commissions or other compensation to such
     broker, agent or salesperson, and that no such broker, agent or salesperson
     has asserted any claim or right to any such commission or other
     compensation. Such representing party shall defend and indemnify the other
     party and hold the other party harmless from and against any and all loss,
     cost, liability, damage and expense (including reasonable attorneys' fees)
     whatsoever that may arise out of the breach of such representation and
     warranty.

This Lease shall be effective as of the later of the dates of Landlord's and
Tenant's signature on this Lease, as set forth below.

LANDLORD:

SNOQUALMIE RIDGE CASCADE VIEW LLC

By The Quadrant Corporation, its Member

By: /s/ George. F. Sherwin. Jr.
    ------------------------------------
Name: George. F. Sherwin. Jr.
Title: Vice President

Date: 2/28/00

By Connecticut General Life Insurance Company,
on behalf of its Separate Account R, its Member

By: CIGNA Investments, Inc.

By: /s/ John G. Eisele
    ------------------------------------
Name: John G. Eisele
Title: Managing Director

Date: 3/2/2000

                                       26

<PAGE>

TENANT:

GREAT PLAINS SOFTWARE O.C., INC.

By: /s/ DAVID M. O'HARA
    --------------------------------
Name: DAVID M. O'HARA
Title: VP OF BUSINESS DEVELOPMENT

Date: 2-24-00

                                       27

<PAGE>

STATE OF WASHINGTON )
                    ) ss.
COUNTY OF KING      )

     I certify that I know or have satisfactory evidence that George F. Sherwin
is the person who appeared before me, and said person acknowledged that said
person signed this instrument, on oath stated that said person was authorized to
execute the instrument and acknowledged it as the Vice President of THE QUADRANT
CORPORATION, a corporation, which is a Member of SNOQUALMIE RIDGE CASCADE VIEW
LLC, the limited liability company that executed the within and foregoing
instrument, to be the free and voluntary act of such party for the uses and
purposes mentioned in the instrument.

     Dated this 28th day of February, 2000.

(SEAL)                                  /s/ June Killmer
                                        ----------------------------------------

                                        ----------------------------------------
                                        (print or type name)
                                        NOTARY PUBLIC in and for the State of
                                        Washington, residing at Bellevue
                                        My Commission expires: 7/01/03

[Seal or Stamp]

                                       28

<PAGE>

STATE OF Connecticut )
                     ) ss.
COUNTY OF Hartford   )

     I certify that I know or have satisfactory evidence that John Eisele is the
person who appeared before me, and said person acknowledged that said person
signed this instrument, on oath stated that said person was authorized to
execute the instrument and acknowledged it as the Managing Director of CIGNA
INVESTMENTS, INC., a corporation, which is the ________________ if CONNECTICUT
GENERAL LIFE INSURANCE COMPANY, a corporation, which is a Member of SNOQUALMIE
RIDGE CASCADE VIEW LLC, the limited liability company that executed the within
and foregoing instrument, to be the free and voluntary act of such party for the
uses and purposes mentioned in the instrument.

     Dated this 2 day of March, 2000.

(STAMP)                                 /s/ Donna O'Hara
                                        ----------------------------------------

                                        ----------------------------------------
                                        (print or type name)
                                        NOTARY PUBLIC in and for the State of
                                        CT, residing at Hartford
                                        My Commission expires: 11/30/04

[Seal or Stamp]

                                       29

<PAGE>

STATE OF Minnesota )
                   ) ss.
COUNTY OF Clay     )

On this 24 day of February, 2000, before me, the undersigned, a Notary Public in
and for the State of Minnesota personally appeared David O'Hara, to me known to
be the VP of Business Development of GREAT PLAINS SOFTWARE O.C., INC., the
corporation that executed the foregoing instrument, and acknowledged the said
instrument to be the free and voluntary act and deed of said corporation, for
the uses and purposes therein mentioned, and on oath stated that he/she was
authorized to execute the said instrument on behalf of said party.

WITNESS MY HAND AND OFFICIAL SEAL hereto affixed the day and year first above
written.

(STAMP)                                 ----------------------------------------
                                        Name Annetta M. Julsrud
                                        NOTARY PUBLIC in and for the State of
                                        Minnesota residing at Moorhead
                                        My commission expires 1/31/05

                                       30

<PAGE>

                                   EXHIBIT A-1

                              to that Lease between
                   SNOQUALMIE RIDGE CASCADE VIEW LLC, LANDLORD
                                       and
                    GREAT PLAINS SOFTWARE O.C., INC., TENANT

                                    PREMISES

                                [2ND FLOOR PLAN]

34931 SE Douglas Street, Suite 200
Snoqualmie, WA 98065

                                     A-1

<PAGE>

                                   EXHIBIT A-2

                              to that Lease between
                 SNOQUALMIE RIDGE CASCADE VIEW LLC, LANDLORD and
                    GREAT PLAINS SOFTWARE O.C., INC., TENANT

                          LEGAL DESCRIPTION OF PROPERTY

Lot 2 of City of Snoqualmie Certificate of Segregation No. 99-01 as recorded
under King County Recording Number 9904019007, Records of King County,
Washington.

                                        1

<PAGE>

                                   EXHIBIT A-3

                              to that Lease between
                 SNOQUALMIE RIDGE CASCADE VIEW LLC, LANDLORD and
                    GREAT PLAINS SOFTWARE O.C., INC., TENANT

                       LEGAL DESCRIPTION OF BUSINESS PARK

All that property contained within the exterior boundary of City of Snoqualmie
Binding Site Improvement Plan No. BSIP 97-01 (also known as Snoqualmie Ridge
Binding Site Improvement Plan No. 1) per instrument filed in Volume 185 of
Surveys, Pages 32 through 38, inclusive, Recording No. 9805051715, Records of
King County, Washington. Said binding site improvement plan was amended by that
Affidavit of Correction filed under King County Recording No. 9805190462.

                                       1

<PAGE>

                                    EXHIBIT B

                              to that Lease between
                 SNOQUALMIE RIDGE CASCADE VIEW LLC, LANDLORD and
                    GREAT PLAINS SOFTWARE O.C., INC., TENANT

                                   WORK LETTER

                                       1

<PAGE>

                              WORK LETTER AGREEMENT

                               TENANT IMPROVEMENTS

     Work Letter Agreement ("Agreement"), dated for reference purposes as of the
2nd day of March, 2000, by and between SNOQUALMIE RIDGE CASCADE VIEW LLC, a
Washington limited liability company ("Landlord"), and GREAT PLAINS SOFTWARE
O.C, INC., a Minnesota corporation ("Tenant").

     Concurrently with the execution of this Agreement, Landlord and Tenant have
entered into a lease ("Lease") covering certain premises ("Premises") more
particularly described in Exhibit A-1 attached to the Lease.

     In order to induce Tenant to enter into the Lease and in consideration of
the mutual covenants hereinafter contained, Landlord and Tenant hereby agree as
follows. Capitalized terms used, but not otherwise defined, herein shall have
the meanings ascribed to them in the Lease.

1.   COMPLETION SCHEDULE

     1.1  Attached is a schedule ("Work Schedule") setting forth a timetable for
          the planning and completion of the installation of the Tenant
          Improvements to be constructed in the Premises prior to the
          Commencement Date of the Lease. The Work Schedule sets forth each of
          the various items of work to be done by or approval to be given by
          Landlord and Tenant in connection with the completion of the Tenant
          Improvements. The Work Schedule shall be the basis for completing the
          Tenant Improvements work. Landlord and Tenant shall each exert their
          good faith, reasonable and diligent efforts to achieve completion or
          approval of the matters described in the Work Schedule on or before
          the dates set forth therein; and Landlord and Tenant each agree to
          promptly and diligently respond to all questions and concerns raised
          by architects, engineers and other consultants in connection
          therewith.

2.   LANDLORD'S WORK

     2.1  Landlord shall complete, at its sole cost, on or before the
          Commencement Date the following items ("Landlord's Work"):

          2.1.1 All site work.

          2.1.2 Finished first floor lobby.

          2.1.3 Toilet cores on first and second floors (including showers on
               both floors, subject to Section 2.2).

          2.1.4 Rooftop-mounted variable air volume HVAC system with vertical
               supply duct and return air shaft to each floor.

          2.1.5 Power and communications to central rooms.

          2.1.6 Second floor lobby shell.

     2.2  Building Modifications. The current plans for Landlord's Work
          contemplate construction of second floor showers and construction of
          the HVAC air shaft in a certain location. The construction of the
          second showers and the particular location of the HVAC air shaft are
          necessitated by the special requirements of a prospective tenant with
          whom Landlord is presently negotiating a lease for the entire first
          floor of the Building. Landlord reserves

                                        1

<PAGE>

          the right to eliminate the second floor showers, unless Tenant agrees
          to pay for showers as a Tenant Improvement item, and relocate the HVAC
          air shaft to a different location if Landlord does not enter into a
          lease with such prospective tenant, in which case the Tenant
          Improvement Plans shall be modified to reflect such changes.

3.   TENANT IMPROVEMENTS; TENANT IMPROVEMENTS PLANS

     3.1  In this Agreement "Tenant Improvements" shall include all work to be
          done in the Premises pursuant to the Tenant Improvements Plans
          described in and developed in accordance with this Section 3, as
          modified by Tenant pursuant to Section 4. Landlord and Tenant shall
          prepare a Space Plan for the Tenant Improvements in accordance with
          the Work Schedule. The Space Plan, once prepared, shall then be
          subject to each party's review and approval in accordance with the
          Work Schedule. Based upon the mutually-approved Space Plan, Landlord
          shall then prepare the Tenant Improvements permit plans (i.e., the
          plans used for submittal to the appropriate governmental bodies for
          all necessary permits and approvals) and the Tenant Improvements
          construction documents, (i.e., final working drawings and
          specifications for the Tenant Improvements) in accordance with the
          Work Schedule. The Tenant Improvements construction documents, once
          prepared, shall then be subject to each party's review and approval in
          accordance with the Work Schedule. The Tenant Improvements
          construction documents, once mutually-approved, shall then constitute
          the "Tenant Improvements Plans."

     3.2  After determination of the Space Plans and preparation of the Tenant
          Improvements permit plans, the Tenant Improvements permit plans shall
          be submitted to the appropriate governmental body for plan checking
          and issuance of necessary permits and approvals. Landlord, with
          Tenant's cooperation, shall cause to be made any changes in the Tenant
          Improvements permit plans, Tenant Improvements construction documents
          and Tenant Improvements Plans necessary to obtain such permits and
          approvals.

4.   TFNANT REQUESTED CHANGES TO TENANT IMPROVEMENTS PLANS

     4.1  After determination of the Tenant Improvements Plans, Tenant may, at
          Tenants election, request revisions, modifications, changes and
          amendments to the Tenant Improvements Plans; and, subject to
          Landlord's consent and approval, in the exercise of Landlord's
          reasonable discretion, the Tenant Improvements Plans shall be so
          revised, provided, however, that all costs relating to re-design of
          the Tenant Improvements for such change, costs for changes to the
          Tenant Improvements Plans, additional permitting or fees which may be
          required in connection with such change, and any increased Tenant
          Improvements construction costs shall be paid by Tenant. Additionally,
          any delay resulting from any such changes together with the time
          period for the preparation of estimates and review and approval by
          Landlord and Tenant shall constitute a Tenant Delay in accordance with
          the provisions of Section 8. If approved by Landlord, changes to the
          Tenant Improvements Plans shall be evidenced by written change order
          signed by Landlord, Tenant and the Tenant Improvements contractor.
          Landlord shall have the right to decline Tenant's request for a change
          to the Tenant Improvements Plans if such changes are inconsistent with
          the other provisions of this Agreement, if such change would, in
          Landlord's judgment, delay completion of the Tenant Improvements
          beyond the Commencement Date, or if such change would, in Landlord's
          judgment, substantially alter the quality or character of the Building
          in which the Premises are situated.

5.   DETERMINATION OF FINAL PRICING

     5.1  After the determination of the Tenant Improvements Plans, Landlord
          shall prepare and deliver to Tenant a final pricing in accordance with
          the Work Schedule, which final pricing

                                        2

<PAGE>

          shall remain subject to adjustment for any modifications to the Tenant
          Improvements Plans required by the appropriate governmental body in
          connection with the issuance of permits and approvals.

6.   CONSTRUCTION OF TENANT IMPROVEMENTS

     6.1  Landlord shall cause the Tenant Improvements to be substantially
          completed sufficient for the issuance of a temporary certificate of
          occupancy for the Premises on or before the Commencement Date of the
          Lease in accordance with the provisions set forth in this Work Letter.
          Landlord shall supervise the completion of such work and shall use
          diligent efforts to secure substantial completion of the work in
          accordance with the Work Schedule. The cost of such work shall be paid
          as provided in Section 7.

     6.2  In connection with the construction of the Tenant Improvements,
          Landlord and Tenant shall arrange for Tenant to have access to the
          Premises commencing approximately 75 days prior to the estimated date
          for substantial completion shown on the Work Schedule, in order to
          allow Tenant to install telephone lines and telephone systems, fiber
          optics, computer cabling, and related similar matters, and, on a
          "space ready" basis only, to commence installation of Tenant's trade
          fixtures. Tenant shall schedule installation of such items with
          Landlord and the Tenant Improvements contractor so as not to
          unreasonably impede, interfere with or delay the progress of
          construction of the Tenant Improvements; and Tenant shall perform such
          installation in accordance with any guidelines provided by the Tenant
          Improvements contractor. Delay, interference or damage arising out of
          Tenant's installation of such items shall constitute a Tenant Delay
          under Section 8. Any and all costs of installation of such items shall
          be at Tenant's sole cost and expense.

     6.3  During the period of construction of the Tenant Improvements, Landlord
          shall consult with Tenant from time to time as necessary to achieve
          approval of certain matters and installations related to the Tenant
          Improvements. Such approvals shall be forthcoming from Tenant within a
          reasonable time period as requested by Landlord, which time period
          shall enable Landlord to maintain the schedule for substantial
          completion of the Tenant Improvements stated in the Work Schedule.
          Failure of Tenant to respond within such requested time period shall
          constitute a Tenant Delay.

     6.4  During the period of construction of the Tenant Improvements, Landlord
          and Tenant shall meet at regular meetings occurring at least once
          monthly regarding the status of the construction and occurring at
          least once weekly during the final month of construction. If timely,
          matters requiring Tenant's approval may be determined at such meetings
          and decisions shall be reflected in the minutes of such meetings.

7.   PAYMENT OF COST OF THE TENANT IMPROVEMENTS

     7.1  Design Allowance. Tenant is entitled to a "Design Allowance" of up to
          $20,055. Such Design Allowance shall be used only for payment of the
          cost of preparing the space plan and the final working drawings and
          specifications, including mechanical, electrical, plumbing and
          structural drawings and all other aspects of the Tenant Improvements
          Plans.

     7.2  Tenant Improvement Allowance. Tenant is entitled to a "Tenant
          Improvement Allowance" of $1,002,750. Such Tenant Improvement
          Allowance shall be used only for:

          7.2.1 The payment of plan check, permit, license fees and insurance
               premiums relating to construction of the Tenant Improvements.

                                        3

<PAGE>

          7.2.2 Construction of the Tenant Improvements, including without
               limitation the following:

               7.2.2.1 Installation within the Premises of all partitioning,
                    doors, window coverings, floor coverings, ceilings, wall
                    coverings and painting, millwork and similar items.

               7.2.2.2 All electrical wiring, lighting fixtures, outlets and
                    switches and other electrical work to be installed within
                    the Premises.

               7.2.2.3 The furnishing and installation of all duct work,
                    terminal boxes, diffusers and accessories required for the
                    completion of the heating, ventilation and air conditioning
                    systems within the Premises, including the cost of meter and
                    key control for after-hour heating, ventilation and air
                    conditioning.

               7.2.2.4 Any additional Tenant requirements including but not
                    limited to odor control, special heating, ventilation and
                    air conditioning, noise or vibration control or
                    other special systems.

               7.2.2.5 All fire and life safety control systems such as fire
                    walls, sprinklers, halon, fire alarms, including piping,
                    wiring and accessories installed within the Premises.

               7.2.2.6 All plumbing, fixtures, pipes and accessories to be
                    installed within the Premises.

               7.2.2.7 Testing and inspection costs.

               7.2.2.8 Contractor's fees, including but not limited to any fees
                    based on general conditions.

               7.2.2.9 All applicable Washington State sales taxes.

     7.3  The cost of each item shall be charged against the Design Allowance or
          the Tenant Improvement Allowance, as applicable, until the applicable
          allowance is exhausted. In the event that the cost of designing the
          Tenant Improvements exceeds the Design Allowance, or the cost of
          installing the Tenant Improvements, as established by the final
          pricing schedule to be determined by Landlord and Tenant, exceeds the
          Tenant Improvement Allowance, or if any of the Tenant Improvements are
          not to be paid out of the Tenant Improvement Allowance, then the
          excess shall be paid by Tenant to Landlord not later than thirty days
          after invoice from Landlord to Tenant for the same, but in no event
          shall such excess be due prior to June 1, 2000.

     7.4  If, after the Tenant Improvements Plans have been established and the
          final pricing has occurred, Tenant shall require changes or
          substitutions to the Tenant Improvements Plans, any additional costs
          thereof shall be paid by Tenant to Landlord not later than thirty days
          after invoice from Landlord to Tenant for the same, but in no event
          shall such payments be due prior to June 1, 2000. Landlord shall have
          the right to decline Tenant's request for a change to the Tenant
          Improvements Plans as provided in Section 3.1.

     7.5  In the event that the cost of the Tenant Improvements increases as set
          forth in Landlord's final pricing due to the requirements of any
          governmental agency and such increases exceed any available remaining
          amount of the Tenant Improvement Allowance, Tenant

                                        4

<PAGE>

          shall pay Landlord the amount of such increase within 30 days after
          receipt of Landlord's invoice for the same, but in no event shall such
          excess be due prior to June 1, 2000.

8.   TENANT DELAY

     8.1  As used in this Agreement and in the Lease, "Tenant Delay" means any
          delay caused by (i) Tenant's failure to meet its obligations under the
          Lease or this Agreement, (ii) Tenant initiated changes to the Tenant
          Improvements Plans, (iii) Tenant's failure to perform actions or
          approve items in accordance with the Work Schedule or Section 1.1, or
          (iv) interference or damage arising out of Tenant's installation of
          telephone lines and telephone systems, fiber optics, computer cabling,
          and related similar matters pursuant to Section 6.2.

     8.2  In addition to the provisions in Article 4 of the Lease addressing the
          effects of Tenant Delay on the Commencement Date and the Rent
          Commencement Date, Tenant shall indemnify, defend and hold Landlord
          harmless from and against any and all claims, liabilities, liens,
          costs and expenses (including attorneys' fees) arising out of or
          otherwise attributable to the Tenant Delay.

9.   SUBSTANTIAL COMPLETION

     9.1  The Tenant Improvements shall be deemed substantially complete
          notwithstanding the fact that minor details of construction,
          mechanical adjustments or decorations which do not materially
          interfere with Tenant's use and enjoyment of the Premises remain to be
          performed (items normally referred to as "punch list" items). Landlord
          shall proceed with all due diligence to complete the punch list items
          as soon as reasonably possible.

10.  TENANT REPRESENTATIVE

     10.1 Tenant appoints Ann Packer as Tenant's Representative to act for
          Tenant in all matters under this Agreement. All inquiries, requests,
          instructions, authorizations, and other communications under this
          Agreement may be made by Landlord to Tenant's Representative. Tenant
          may change the identity of Tenant Representative by notice in writing
          to Landlord.

11.  SIGNAGE DURING CONSTRUCTION

     11.1 During the construction period, to the extent permitted by the City of
          Snoqualmie, Landlord may provide such signage stating the future
          tenancy of Tenant as Landlord deems appropriate.

12.  WARRANTIES

     12.1 Landlord shall obtain from all contractors and subcontractors
          providing material and labor in the construction of the Tenant
          Improvements all commercially reasonable warranties (including
          manufacturers' warranties) for their respective materials or labor
          which are available from such contractors or subcontractors. All such
          warranties shall be in writing and shall run to Landlord. To the
          extent there exists any defect in the Tenant Improvements, which is
          covered by the warranties obtained under this Section, Landlord shall
          seek to enforce such warranties in accordance with their terms.

13.  GENERAL

                                        5

<PAGE>

     13.1 The provisions of the Lease and of the Exhibits hereto are made a part
          of this Agreement. The parties shall execute such further documents
          and instruments and take such other further actions as may be
          reasonably necessary to carry out the intent and provisions of this
          Agreement.

This Agreement shall be effective as of the later of the dates of Landlord's and
Tenant's signature on this Agreement, as set forth below.

                                        LANDLORD:

                                        SNOQUALMIE RIDGE CASCADE VIEW LLC

                                        By: The Quadrant Corporation, its Member

                                        By: /s/ George. F. Sherwin. Jr.
                                            ------------------------------------
                                        Name: George. F. Sherwin. Jr.
                                        Title: Vice President

                                        Date: 2/28/2000

                                        By Connecticut General Life Insurance
                                           Company, on behalf of its Separate
                                           Account R, its Member

                                        By: CIGNA Investments, Inc.

                                        By: /s/ JOHN G. EISELE
                                            ------------------------------------
                                        Name: JOHN G. EISELE
                                        Title: MANAGING DIRECTOR

                                        Date: 3/2/2000

                                        TENANT:

                                        GREAT PLAINS SOFTWARE O.C., INC.

                                        By: /s/ DAVID M. O'HARA
                                            ------------------------------------
                                        Name: DAVID M. O'HARA
                                        Title: VP OF BUSINESS DEVELOPMENT

                                        Date: 2-24-00

                                        6

<PAGE>

                                  WORK SCHEDULE

<TABLE>
<CAPTION>
DATE      ACTION ITEM
----      -----------
<S>       <C>
2/23/00   Preparation of Space Plan and Submission to Landlord and Tenant for
          Approval

2/23/00   Tenant and Landlord Approval of Space Plan

2/25/00   Tenant and Landlord Execution of Lease Document

3/06/00   Tenant Improvements Permit Plans Submitted for Tenant Improvements
          Construction Permit

3/13/00   Architect Completion of Draft Tenant Improvements Construction
          Documents "Check Set" and Submission to Landlord and Tenant for
          Approval

3/17/00   Tenant and Landlord Approval of Tenant Improvements Construction
          Documents (i.e., Determination of Tenant Improvement Plans)

3/24/00   Determination of Final Pricing

3/21/00   Tenant Improvements Construction Permit Issued

6/27/00   Substantial Completion and Issuance of Temporary Certificate of
          Occupancy

6/19/00   Lease Commencement Date
</TABLE>

                                        7

<PAGE>

                                    Exhibit B

                         FURNITURE, FIXTURES & EQUIPMENT

   The following items generally reflect the recording of the walk through of
        the space by representatives from Light Sciences and Microsoft on
                               September 7, 2002.

-    Eight (8) private offices with furniture

-    Two (2) folding tables

-    Fifty-two (52) task chairs

-    Nine (9) guest chairs

-    Forty-one (41) Steelcase workstations

-    One (1) tall wood bookcase

-    One (1) shelf bookcase

-    Six (6) 60" tables

-    One (1) 42" table

-    Three (3) 30" tables

-    One (1) sofa

-    Two (2) cherry lounge chairs

-    One (1) credenza

-    One (1) drum table

-    Three (3) storage cabinets

-    Six (6) miscellaneous tables

-    One (1) AV cart

-    One (1) Liebert unit

                                       B-1

<PAGE>

                                    Exhibit C

                                   Space Plan

                                       C-1

<PAGE>

                                [2ND FLOOR PLAN]

<PAGE>
                                   Schedule C

                          Diagram of Subleased Premises

<PAGE>

                                   Schedule D

                           Designated Shared Equipment

<TABLE>

Asset ID  Asset Description
--------  -----------------
<S>       <C>

0002      Radiometer & Sphere
0024      Bausch & Lomb STZ 4 Microscope w/accesso
0033      18 Channel Mixed Signal Oscilloscope
0034      Clean Room
0195      Programmable DC Power Supply (Dual)
0310      Multi-Channel Spectroradiometer OL 770
0318      Heavy Load Workstation w/Sci Gr Breadbd
0320      USB 2000-FL Optic Spectrometer w/LED
0321      Ocean Optics 2000 Fiber Optic Spectromet
0336      PC-3 ULTRA, 115V, 50 W, Spot Lamp
0362      Waverunner 6050, 4 ch, 500MHz 5GS/s DSO
0374      DC power supply, dual output, dual range
0389      81pc set Cera/Steel Gage Block Set
0399      Stereo Zoom Microscope
0405      XPERT Labconco Fume Hood, Wk Srfc, Stand
0406      Filtermate 115V Hepa-Carbon Filter
0411      HEPA Purifier Enclosure w/Wk Sfc & Base
0450      BeamStar FX 66 Camera w/Software & Accs
0524      Vertical Milling Machine
</TABLE>

               The Designated Shared Equipment includes miscellaneous lab
supplies and tools located in the Shared Areas.<PAGE>

                                                                   Exhibit 10.13

                            ASSET TRANSFER AGREEMENT

                                     BETWEEN

                           LIGHT SCIENCES CORPORATION

                                       AND

                          LIGHT SCIENCES ONCOLOGY, INC.

                              DATED OCTOBER 5, 2005

<PAGE>

                                LIST OF SCHEDULES

<TABLE>
<CAPTION>
Schedule   Description
--------   -----------
<S>        <C>
    A      Transferred Assets
    B      Assigned Contracts
    C      Required Consents
    D      Certain Transferring Employees
    E      Transferring Employees Executing Releases
</TABLE>

                                LIST OF EXHIBITS

<TABLE>
<CAPTION>
Exhibit   Description
-------   -----------
<S>       <C>
  A-1     Bill of Sale for Drug Product
  A-2     Bill of Sale for Equipment
   B      Sublease Agreement
   C      Exclusive License Agreement
   D      Sublicense Agreement
   E      Clinical Supply Agreement
</TABLE>

                                                                          PAGE i

<PAGE>

                            ASSET TRANSFER AGREEMENT

     This Agreement, dated as ofOctober 5, 2005, is made and entered into by and
between: Light Sciences Corporation, a Washington corporation ("LSC"), and Light
Sciences Oncology, Inc., a Washington corporation ("LSO").

                                    RECITALS

     A. LSC has developed a light activated treatment system known as Lit(x).

     B. LSO, a wholly owned subsidiary of LSC, has been formed to further
research, develop and commercialize Lit(x) in the field specified in the
Exclusive License Agreement referenced below ("FIELD").

     C. LSC wishes to transfer to LSO, and LSO wishes to obtain from LSC,
certain assets, contracts, regulatory filings and licenses necessary or useful
for LSO to further develop and commercialize Lit(x) in the Field, subject to the
terms and conditions of this Agreement.

                                    AGREEMENT

     NOW THEREFORE, in consideration of the promises and agreements set forth
herein, the parties agree as follows:

SECTION 1. TRANSFER OF ASSETS AND RELATED TRANSACTIONS

     1.1  TRANSFER OF ASSETS

     LSC will sell, assign, transfer and convey to LSO on the Closing Date (as
defined in Section 2) all right, title and interest of LSC in and to all
equipment, devices, drug product, packaging, books, certificates, documents,
files, records, results, protocols and other tangible assets necessary or useful
for the research, development or commercialization of Lit(x) in the Field,
including, without limitation, the assets described in attached Schedule A
("TRANSFERRED ASSETS"). LSC will sell, assign, transfer and convey the
Transferred Assets to LSO pursuant to the Bills of Sale attached as Exhibit A-1
and Exhibit A-2 (each, a "BILL OF SALE"). To the extent that the Transferred
Assets include works of authorship subject to copyright protection, LSC will
sell, assign, transfer and convey to LSO on the Closing Date all copyrights in
and to such works, including, without limitation, all causes of action and
rights to sue and recover damages for past infringement. Notwithstanding this
Section 1.1, the Transferred Assets do not include the equipment identified as
"Designated Shared Equipment" in the Sublease Agreement (as defined in Section
1.3).

                                                                          PAGE 1

<PAGE>

     1.2  ASSIGNMENT AND ASSUMPTION OF ASSIGNED CONTRACTS

     (a) LSC will assign to LSO on the Closing Date all right, title and
interest of LSC in and under the contracts listed in attached Schedule B
("ASSIGNED Contracts"), including, without limitation, all claims of LSC under
any Assigned Contract arising before the Closing Date and all data, reports,
records or other documents furnished to LSC under the Assigned Contracts before
the Closing Date.

     (b) Upon the Closing (as defined in Section 2), LSO will assume the
liabilities and obligations of LSC arising under the Assigned Contracts after
the Closing Date ("ASSUMED OBLIGATIONS"). LSO will fully and timely perform all
of the Assumed Obligations in accordance with the applicable Assigned Contracts.
Notwithstanding anything to the contrary in this Agreement, LSO will succeed to
and assume, and LSO will be responsible for, only those liabilities or
obligations arising out of any claim resulting from any act or omission of LSO
with respect to the Assigned Contracts occurring after the Closing Date.

     (c) Before the Closing Date, LSC will obtain consent in the form provided
by LSO for the assignment of the Assigned Contracts listed in attached Schedule
C ("REQUIRED CONSENTS").

     (d) LSC will use its best efforts to obtain, within thirty (30) days after
the Closing Date, consent in the form provided by LSO for the assignment of any
Assigned Contract not listed in Schedule C that cannot be assigned to LSO
without the consent of the other contracting party. Notwithstanding anything in
this Agreement to the contrary, this Agreement will not constitute or require
LSC to assign any Assigned Contract or LSO to assume any Assumed Obligation with
respect thereto if the assignment of the Assigned Contract without the consent
of a third party would constitute a breach thereof or give the third party the
right to terminate the Assigned Contract. Until such consent is obtained, LSC
will use its best efforts to provide LSO the benefits of any such Assigned
Contract, including, without limitation, enforcing the Assigned Contract for the
benefit of, and as directed by, LSO at LSO's expense.

     1.3  SUBLEASE AND SPACE SHARING

     Commencing on the Closing Date, LSC will sublease to and share with LSO
certain office and laboratory space pursuant to the Sublease Agreement attached
as Exhibit B ("SUBLEASE AGREEMENT").

     1.4  LICENSE AGREEMENT

     On the Closing Date, LSC will exclusively license to LSO certain
intellectual property and intellectual property rights associated with Lit(x)
for use in the Field

                                                                          PAGE 2

<PAGE>

pursuant to the Exclusive License Agreement attached as Exhibit C ("EXCLUSIVE
LICENSE AGREEMENT").

     1.5  SUBLICENSE AGREEMENT

     On the Closing Date, LSC will sublicense to LSO certain intellectual
property and intellectual property rights associated with Lit(x) for use in the
Field pursuant to the Sublicense Agreement attached as Exhibit D ("SUBLICENSE
AGREEMENT").

     1.6  TRANSFER OF REGULATORY FILINGS

     (a) LSC will transfer and assign to LSO on the Closing Date all right,
title and interest of LSC in and to any and all INDs, drug master files and
other regulatory filings or registrations and all supplements and amendments
thereto that pertain to the use of Lit(x) and its components in the Field.
Promptly after the Closing Date, LSC will submit all information and documents
to the applicable regulatory authorities necessary to effect such transfer.

     (b) Following the Closing Date, LSC will make available to LSO and permit
LSO to cross reference any and all regulatory filings or registrations and all
supplements and amendments thereto of LSC not assigned to LSO under this
Agreement that are useful or necessary for the conduct of LSO's business. If LSC
has the right to cross reference any regulatory filings or registrations of a
third party that are useful or necessary for the conduct of LSO's business, then
LSC will use reasonable efforts to obtain permission for LSO to cross reference
such filings or registrations. All such information will be deemed the
Confidential Information of LSC under this Agreement.

     1.7  RELATED AGREEMENTS

     The Bills of Sale, Sublease Agreement, Exclusive License Agreement and
Sublicense Agreement are hereinafter referred to collectively as the "RELATED
AGREEMENTS" and are incorporated into this Agreement by this reference.

     1.8  EXCLUDED LIABILITIES

     LSO does not assume and will not become liable for, and LSC will pay and be
responsible for, any and all claims, debts, liabilities, taxes, penalties and
obligations arising from or relating to (a) ownership, use or other dealings
with the Transferred Assets before the Closing Date, and (b) the Assigned
Contracts before the Closing Date. Without limiting the foregoing, LSO will not
succeed to or assume, and LSO will not be responsible for, any liability or
obligation arising out of any claim resulting from any act or omission of LSC
with respect to the Assigned Contracts on or before

                                                                          PAGE 3

<PAGE>

the Closing Date, including, without limitation, any breach by LSC of any
Assigned Contract or any failure by LSC to discharge or perform any liability or
obligation arising on or before the Closing Date under any such Assigned
Contract.

SECTION 2. CLOSING

     The consummation of the transactions contemplated by this Agreement
("CLOSING") will take place at the offices of Perkins Coie LLP, 1201 Third
Avenue, Seattle, WA 98101, on the day prior to the closing of the Series A
Convertible Preferred Stock financing of LSO ("CLOSING DATE").

SECTION 3. REPRESENTATIONS AND WARRANTIES OF LSC

     In addition to any representations and warranties contained in the Related
Agreements, LSC represents and warrants to LSO as of the date of this Agreement
and as of the Closing Date:

     3.1  ORGANIZATION

     LSC is a Washington corporation duly incorporated and validly existing
under the laws of the state of Washington. LSC has the power and authority to
own, operate and carry on its business as it is now being conducted.

     3.2  AUTHORIZATION

     LSC has all necessary power and authority to execute and deliver this
Agreement and the Related Agreements, to perform its obligations under this
Agreement and the Related Agreements and to consummate the transactions
contemplated by this Agreement and the Related Agreements. The execution and
delivery by LSC of this Agreement and the Related Agreements, the performance by
LSC of its obligations under this Agreement and the Related Agreements and the
consummation by LSC of the transactions contemplated by this Agreement and the
Related Agreements have been duly authorized by all necessary action. This
Agreement constitutes a valid and binding obligation of LSC and is enforceable
in accordance with its terms, and the Related Agreements, when executed and
delivered by LSC, will constitute valid and binding obligations of LSC, subject
to laws of general application relating to bankruptcy, insolvency,
reorganization, moratorium, relief of debtors, other laws relating to or
affecting enforcement of creditors' rights and rules of law governing specific
performance, injunctive relief or other equitable remedies.

                                                                          PAGE 4

<PAGE>

     3.3  OTHER AGREEMENTS

     The execution, delivery and performance of this Agreement and the Related
Agreements will not cause LSC to be in violation of or in default under any
applicable laws, articles of incorporation or bylaws of LSC, or any agreement or
instrument to which LSC is a party or by which its assets may be bound.

     3.4  TRANSFERRED ASSETS

     LSC has good, valid and marketable title to all of the Transferred Assets,
free and clear of any and all claims, judgments, licenses, liens, restrictions,
security interests and other encumbrances.

     3.5  ASSIGNED CONTRACTS

     The Assigned Contracts are valid, binding and enforceable in accordance
with their terms against LSC and each other party thereto and are in full force
and effect, LSC has performed all obligations imposed on it thereunder, and
neither LSC, nor to the knowledge of LSC, any other party thereto, is in breach
or default thereunder, nor is there any event that with notice or lapse of time,
or both, would constitute a default by LSC or, to the knowledge of LSC, any
other party thereunder. LSC has not received any notice of any breach,
termination or cancellation of any Assigned Contract and, to its knowledge, no
party thereto intends to terminate or cancel any Assigned Contract. True and
complete copies of each Assigned Contract have been delivered to LSO.

     3.6  LITIGATION

     There are no actions, claims, investigations or proceedings pending or, to
the knowledge of LSC, threatened against LSC affecting any of the Transferred
Assets, Assigned Contracts, the Related Agreements, the regulatory filings or
registrations transferred under Section 1.6 or the premises leased under the
Sublease Agreement before any court, arbitrator or governmental authority and
there is no valid basis for any such action, claim, investigation or proceeding.
There are no outstanding or unsatisfied judgments, orders, decrees or
stipulations to which LSC is a party or, to the knowledge of LSC, affecting any
of the Transferred Assets or the Assigned Contracts.

     3.7  TAXES

     All income, gross receipts, personal property, use, transfer, payroll and
other taxes and related obligations of LSC with respect to the operation of its
business and ownership of the Transferred Assets have been timely paid or are
being contested in good faith.

                                                                          PAGE 5

<PAGE>

     3.8  CONSENTS AND APPROVALS

     No consent, approval or authorization of, or declaration, filing or
registration with, any governmental body is required for the execution, delivery
and performance by LSC of this Agreement and the Related Agreements and for the
consummation by LSC of the transactions contemplated hereby and thereby. Except
for the consents described in Section 1.2, no consent, approval or authorization
of any third party is required for the execution, delivery and performance by
LSC of this Agreement and the Related Agreements and the consummation by LSC of
the transactions contemplated hereby and thereby.

     3.9  COMPLIANCE WITH LAWS

     LSC is and has been in compliance with all federal, state, local and
foreign laws, rules, regulations, ordinances, decrees and orders applicable to
the operation or conduct of its business or ownership, use or other disposition
of the Transferred Assets.

     3.10 EXCLUSIVITY

     THE REPRESENTATIONS AND WARRANTIES SET FORTH IN THIS SECTION 3 AND THE
RELATED AGREEMENTS ARE EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER WARRANTIES OF
LSC. LSC DISCLAIMS ANY AND ALL OTHER EXPRESS OR IMPLIED WARRANTIES OF ANY KIND,
INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE OR USE.

SECTION 4. REPRESENTATIONS AND WARRANTIES OF LSO

     In addition to any representations and warranties contained in the Related
Agreements, LSO represents and warrants to LSC as of the date of this Agreement
and as of the Closing Date:

     4.1  ORGANIZATION

     LSO is a corporation duly incorporated and validly existing under the laws
of the state of Washington.

     4.2  AUTHORIZATION

     LSO has all necessary power and authority to execute and deliver this
Agreement and the Related Agreements, to perform its obligations under this
Agreement and the Related Agreements and to consummate the transactions

                                                                          PAGE 6

<PAGE>

contemplated by this Agreement and the Related Agreements. The execution and
delivery by LSO of this Agreement and the Related Agreements, the performance by
LSO of its obligations under this Agreement and the Related Agreements and the
consummation by LSO of the transactions contemplated by this Agreement and the
Related Agreements have been duly authorized by all necessary corporate action.
This Agreement constitutes a valid and binding obligation of LSO, enforceable in
accordance with its terms, and the Related Agreements, when executed and
delivered by LSO, will constitute valid and binding obligations of LSO,
enforceable in accordance with their respective terms, subject to laws of
general application relating to bankruptcy, insolvency, reorganization,
moratorium, relief of debtors, other laws relating to or affecting enforcement
of creditors' rights and rules of law governing specific performance, injunctive
relief or other equitable remedies.

     4.3  OTHER AGREEMENTS

     The execution, delivery and performance of this Agreement and the Related
Agreements will not cause LSO to be in violation of or in default under any
applicable laws, the articles of incorporation or bylaws of LSO, or any
agreement or instrument to which LSO is a party or by which its assets may be
bound.

     4.4  EXCLUSIVITY

     THE REPRESENTATIONS AND WARRANTIES SET FORTH IN THIS SECTION 4 AND THE
RELATED AGREEMENTS ARE EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER WARRANTIES OF
LSO. LSO DISCLAIMS ANY AND ALL OTHER EXPRESS OR IMPLIED WARRANTIES OF ANY KIND,
INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE OR USE.

SECTION 5. CLOSING CONDITIONS

     5.1 CONDUCT OF BUSINESS PRIOR TO CLOSING

     Except for actions taken with the consent of LSO, from the date of this
Agreement until the Closing Date, LSC will (a) give notice to LSO promptly upon
becoming aware of any inaccuracy of any of LSC's representations or warranties
made herein or in a Related Agreement; and (b) conduct its business in the
ordinary course and in a manner consistent with past practice.

                                                                          PAGE 7

<PAGE>

     5.2  CONDITIONS TO LSO'S OBLIGATION TO CLOSE

     The obligation of LSO to close the transactions contemplated by this
Agreement will be subject to the satisfaction at or before the Closing Date of
each of the following conditions, any one or more of which may be waived by LSO:

          (a) the representations and warranties of LSC made in this Agreement
and in any Related Agreement will be true, complete and correct in all material
respects on and as of the Closing Date;

          (b) LSC will have executed and delivered to LSO all of the Related
Agreements;

          (c) LSC will have obtained and delivered the Required Consents to LSO;

          (d) the individuals set forth on Schedule D will have agreed to accept
offers of employment with LSO;

          (e) LSC will not be the subject of a bankruptcy case or other
insolvency proceeding; and

          (f) no action, suit, proceeding or investigation by or before any
court or governmental authority will have been instituted (i) to restrain,
prohibit or invalidate the transactions contemplated by this Agreement or the
Related Agreements; or (ii) that seeks damages by reason of completion of any
such transaction.

     5.3  CONDITIONS TO LSC'S OBLIGATION TO CLOSE

     The obligation of LSC to close the transactions contemplated by this
Agreement will be subject to the satisfaction at or before the Closing Date of
each of the following conditions, any one or more of which may be waived by LSC:

          (a) the representations and warranties of LSO made in this Agreement
and in any Related Agreement will be true, complete and correct in all material
respects on and as of the Closing Date;

          (b) LSO will have executed and delivered to LSC all of the Related
Agreements and the Clinical Supply Agreement attached as Exhibit E; and

          (c) no action, suit, proceeding or investigation by or before any
court or governmental authority will have been instituted (i) to restrain,
prohibit or invalidate the transactions contemplated by this Agreement or the
Related

                                                                          PAGE 8

<PAGE>

Agreements; or (ii) that seeks damages by reason of completion of any such
transaction.

     5.4  CLOSING DELIVERIES OF LSC

     LSC will deliver the following to LSO at the Closing, and the delivery of
each will be a condition to LSO's obligations hereunder:

          (a) the originals (or if not in existence, copies) of the Assigned
Contracts and any amendments thereto and all data, reports, records or other
documents furnished to LSC under the Assigned Contracts before the Closing Date;

          (b) the Transferred Assets (including, without limitation, original
copies of all clinical data, protocols and records associated with Lit(x));

          (c) a certificate of LSC signed by the President of LSC certifying as
to the accuracy, to such officer's knowledge in his capacity as an officer of
LSC, of the representations and warranties of LSC contained in this Agreement
and in Article 3 of the Series A Preferred Stock Purchase Agreement among LSO,
LSC and the investors named therein ("PURCHASE AGREEMENT"); and

          (d) such other documents, certificates, consents, waivers and
supporting papers as LSO or its counsel may deem necessary or advisable to
consummate the transactions contemplated by this Agreement.

     5.5  CLOSING DELIVERIES OF LSO

     LSO will deliver the following to LSC at the Closing: a certificate of LSO
signed by the President and Secretary of LSO certifying as to the accuracy, to
each such officer's knowledge in his capacity as an officer of LSO, of the
representations and warranties of LSO contained in this Agreement and in Article
3 of the Purchase Agreement.

SECTION 6. COVENANTS

     6.1  RELEASES

     LSO and LSC will each use commercially reasonable efforts to obtain a
release of employment related claims in a form reasonably acceptable to LSC from
the individuals set forth on Schedule E before the Closing Date. The foregoing
will not constitute a condition to either party's obligations hereunder.

                                                                          PAGE 9

<PAGE>

     6.2  CONFIDENTIALITY

     Upon and following the Closing Date, LSC will not use and will not
disclose, disseminate, display, publish or distribute to any third party any
information or data relating to or included in the Transferred Assets, Assigned
Contracts or regulatory filings transferred under Section 1.6 or the terms of
this Agreement, the Related Agreements or the Assigned Contracts without the
prior written consent of LSO. However, the foregoing will not restrict the use
or disclosure of any information that: (a) is a matter of public knowledge as of
the date of this Closing Date; (b) becomes a matter of public knowledge, without
fault on the part of LSC, subsequent to the Closing Date; or (c) is disclosed to
LSC by a third party lawfully having possession of such information after the
Closing Date without an obligation of confidentiality to LSO or a prior
obligation of confidentiality to LSC. Further, notwithstanding the foregoing
restrictions, LSC may disclose or produce any information protected under this
Section 6.2 if and to the extent required by any discovery request, subpoena,
court order, governmental action, or to the extent LSC believes in good faith on
the basis of an opinion of counsel that such disclosure is required by
applicable law or regulation; provided, that LSC gives LSO reasonable advance
notice of the same (e.g., so as to afford LSO a reasonable opportunity to
appear, object and obtain a protective order or other appropriate relief
regarding such disclosure).

     6.3  ENFORCEMENT OF OTHER AGREEMENTS

     Upon request, LSC will, as directed by LSO, enforce for the benefit of LSO
all non-disclosure, confidentiality, invention assignment, consulting, license
and other agreements between LSC and any third party that are not included in
the Assigned Contracts and that protect or cover any Confidential Information of
LSO or otherwise pertain to the Transferred Assets or business of LSO. LSO will
reimburse all actual and reasonable expenses incurred by LSC to enforce such
agreements as directed by LSO.

     6.4  FURTHER ASSURANCES

     After the Closing Date, LSC will from time to time at LSO's request execute
and deliver, or cause to be executed and delivered, such further instruments of
conveyance, assignment, transfer or other documents, and perform such further
acts and obtain such further consents, approvals and authorizations, as LSO may
reasonably require in order to consummate the transactions described in this
Agreement, fully effect or evidence the conveyance and transfer to LSO of, or
perfect LSO's right, title and interest in, any of the Assigned Contracts,
Transferred Assets or regulatory filings transferred under Section 1.6, or to
obtain possession or control of any of the Transferred Assets.

                                                                         PAGE 10

<PAGE>

SECTION 7. TERMINATION

     This Agreement may be terminated before the Closing:

          (a) by mutual written agreement of LSO and LSC;

          (b) by LSO, by giving written notice to LSC at any time, if any of the
conditions set forth in Section 5.2 or 5.4 is not satisfied at the time at which
the Closing would otherwise occur, or if the satisfaction of any such condition
is or becomes impossible;

          (c) by LSC, by giving written notice to LSO at any time, if any of the
conditions set forth in Section 5.3 is not satisfied at the time at which the
Closing would otherwise occur, or if the satisfaction of any such condition is
or becomes impossible; and

          (d) by LSO, by giving written notice to LSC, if the closing of the
Series A Convertible Preferred Stock financing of LSO does not close on or
before October 17, 2005.

SECTION 8. INDEMNIFICATION

     8.1 INDEMNIFICATION BY LSC

     LSC will defend and indemnify and hold harmless LSO against any and all
liabilities, losses, damages, claims, costs, expenses, interest, awards,
judgments and penalties (including, without limitation, reasonable attorneys'
fees and expenses) actually suffered or incurred (a "LOSS") by LSO arising out
of or resulting from:

          (a) any inaccuracy in any representation or warranty made by LSC in
     Section 3 of this Agreement or in a Related Agreement; and

          (b) any claims asserted against LSO for acts or omissions of LSC
     occurring before the Closing, including, without limitation, any claims
     arising under any Assigned Contract, arising from or relating to the
     ownership, use or other disposition of the Transferred Assets, or arising
     from any liabilities described in Section 1.8.

     8.2  INDEMNIFICATION BY LSO

     LSO will defend and indemnify LSC against any and all Losses arising out of
or in connection with:

                                                                         PAGE 11

<PAGE>

          (a) any inaccuracy in any representation or warranty made by LSO in
     Section 4 of this Agreement; and

          (b) the failure of LSO to perform any Assumed Obligation.

     8.3  INDEMNIFICATION PROCEDURE

     In order to receive indemnification of any third party claim indemnified
under Section 8.1 or 8.2, as applicable, LSC and LSO (each, an "INDEMNIFIED
PARTY") must:

          (a) give the other party ("INDEMNIFYING PARTY") prompt written notice
     of the claim from which the Indemnified Party seeks indemnification;

          (b) cooperate with the Indemnifying Party, at the Indemnifying Party's
     expense, in connection with the defense and settlement of the claim; and

          (c) not settle or compromise the claim without the prior written
     consent of the Indemnifying Party, which consent will not be unreasonably
     withheld.

SECTION 9. MISCELLANEOUS

     9.1  PRESS RELEASES

     Neither party will release any press release regarding the transactions
contemplated by this Agreement without the other party's prior written consent,
except as may be required by applicable law or regulation.

     9.2  RELATIONSHIP OF THE PARTIES

     Neither this Agreement nor any of the Related Agreements will be
interpreted or construed to create or evidence any partnership, agency or
similar relationship between the parties or as imposing any partnership, agency
or similar obligation or liability on any party.

     9.3  NOTICES

     All notices and other communications hereunder will be in writing and will
be deemed given if delivered personally, by fax (receipt confirmed), or by
registered or certified mail, return receipt requested and postage prepaid or
sent by express courier service (receipt verified), to the parties at the
following addresses (or at such other addresses for a party as will be specified
by the like notice; provided, that notices of a change of address will be
effective only upon receipt thereof):

                                                                         PAGE 12

<PAGE>

     To LSC: Light Sciences Corporation
             34931 SE Douglas Street
             Suite 200
             Snoqualmie, WA 98065
             Attn.: ____________________
             Fax: ______________________

     To LSO: Light Sciences Oncology, Inc.
             34931 SE Douglas Street
             Suite 200
             Snoqualmie, WA 98065
             Attn.: ____________________
             Fax: ______________________

All such notices and communications will be deemed effective when received.

     9.4  ASSIGNMENT

     Neither LSC nor LSO will assign this Agreement any of its rights or
obligations under this Agreement to any third party before the Closing Date
without the other party's prior written consent. Following the Closing Date,
this Agreement will be binding upon and inure to the benefit of the parties and
their respective successors and assigns, except that each Related Agreement will
be assignable solely to the extent set forth in the Related Agreement.

     9.5  SPECIFIC PERFORMANCE

     Each party acknowledges that the other party would be damaged irreparably
in the event any of the provisions of this Agreement are not performed in
accordance with their specific terms or otherwise are breached. Accordingly,
each party will be entitled to specific performance of the terms and provisions
of this Agreement and the Related Agreements.

     9.6  NONWAIVER

     The failure of a party to insist on or enforce strict performance of any
provision of this Agreement or to exercise any right or remedy under this
Agreement or any Related Agreement to which it is a party will not be construed
as a waiver or relinquishment to any extent of the right to assert or rely upon
any such provision, right or remedy in that or any other instance; rather, the
same will be and remain in full force and effect.

                                                                         PAGE 13

<PAGE>

     9.7  SEVERABILITY

     If any provision of this Agreement or any Related Agreement or the
application thereof to any person or circumstance will be invalid, illegal or
unenforceable to any extent, the remainder of this Agreement or Related
Agreement, as the case may be, and the application thereof will not be affected
and will be enforceable to the fullest extent permitted by law.

     9.8  GOVERNING LAW; JURISDICTION AND VENUE

     This Agreement, each Related Agreement and the performance under them will
be interpreted, construed and enforced in all respects in accordance with the
laws of the state of Washington, without reference to its principles relating to
conflicts of law. Each party irrevocably consents to the jurisdiction and venue
of the state and federal courts in King County, Washington, U.S.A., for any
action, claim, proceeding or suit arising out of or in connection with this
Agreement or any Related Agreement. LSC will not commence or prosecute any suit
or claim to enforce this Agreement or any Related Agreement, or otherwise
arising under or by reason of this Agreement or any Related Agreement, other
than in such courts.

     9.9  JURY WAIVER

     Each party hereby waives any right to trial by jury of any claim arising
out of this Agreement and any Related Agreement, whether now or hereafter
arising and whether sounding in contract, tort or otherwise, and hereby consents
and agrees that any such claim may, at a party's election, be decided by trial
without a jury and that either party may file an original counterpart or copy of
this Section 9.9 with any court as written evidence of the waiver and agreement
contained herein.

     9.10 AMENDMENT

     No amendment, modification or waiver of any of the provisions of this
Agreement or any Related Agreement will be valid unless set forth in a written
instrument signed by the party to be bound thereby.

     9.11 NO THIRD PARTY RIGHTS

     There are no third party beneficiaries under this Agreement or any Related
Agreement. Neither this Agreement nor any Related Agreement will confer any
right or remedy on, or be enforceable by, any third party. No action may be
commenced or prosecuted against either party by any third party claiming as a
third party beneficiary of this Agreement or any Related Agreement or any of the
transactions contemplated hereunder.

                                                                         PAGE 14

<PAGE>

     9.12 ATTORNEYS' FEES

     In the event of any litigation, claim, proceeding or arbitration with
respect to this Agreement or the Related Agreements, the prevailing party will
be paid its reasonable legal fees and expenses by the opposing party.

     9.13 ENTIRE AGREEMENT

     This Agreement and the Related Agreements and the Exhibits and Schedules
referenced herein and therein set forth the entire agreement, and supersede any
and all prior agreements, between the parties with regard to the subject matter
hereof. This Agreement and the Related Agreements are intended to be correlative
and complementary. However, in the event of a conflict between any provision of
this Agreement and any provision of any Related Agreement, the provision of the
applicable Related Agreement will control with respect to the subject matter of
the Related Agreement.

     IN WITNESS WHEREOF, the parties have entered into this Agreement as of the
date first set forth above.

LSC:                                    LSO:

Light Sciences Corporation              Light Sciences Oncology, Inc.

By /s/ Albert Luderer                   By /s/ Jay Winship
   ----------------------------------      -------------------------------------
Name Albert Luderer                     Name Jay Winship
Title CEO                               Title COO

                                                                         PAGE 15
<PAGE>

                                   SCHEDULE A

                               TRANSFERRED ASSETS

The Transferred Assets include the assets listed in Schedule A to the Bill of
Sale for Drug Product and Schedule A to the Bill of Sale for Equipment.

SCHEDULE A TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   SCHEDULE B

                               ASSIGNED CONTRACTS

Service Estimate/Talaporfin Sodium Product Testing Letter Agreement dated April
27, 2004, between AAI Development Services, Inc. and LSC

Component Development and Deliverables Services Agreement dated December 27,
2001, and related Statements of Work, between Agilent Technologies Malaysia SDN
BHD and LSC

Letter dated June 1, 2000 from Light Sciences Limited Partnership to Agilent
Technologies amending Agilent Technologies' Semiconductor Products Group Terms
and Conditions of Sale

Master Services Agreement dated November 10, 2004, between Almedica Europe
Limited, Almedica Services Corp and LSC

Technical (Quality) Agreement dated October 28, 2004, between Almedica Europe
Limited, Almedica Services Corp and LSC

Drug Product Development and Clinical Supply Agreement dated July 9, 2004,
between Baxter Pharmaceutical Solutions LLC and LSC

Assignment of Contract dated April 27, 2001, between Beacon BioScience and LSC

Master Services Agreement dated December 19, 2001, between Beacon BioScience,
Inc. and LSC

Sponsored Research Agreement dated April 1, 2005, between BioDevelopment and LSC

Material Transfer Agreement dated October 31, 2003, between East Carolina
University and LSC

EmergingMed Services Agreement dated January 5, 2004, between EmergingMed.com,
Inc. and LSC

Master Services Agreement dated February 27, 2004, between Ergomed Clinical
Research, Ltd. and LSC

Letter of Intent dated October 5, 2004, between Inveresk Research North Carolina
Inc. and LSC

SCHEDULE B TO ASSET TRANSFER AGREEMENT

<PAGE>

Master Services Agreement dated January 22, 2002, between Inveresk Research
North Carolina Inc. and LSC

Research and Manufacturing Agreement dated May 7, 2004, between Pharm-Eco
(Johnson-Matthey Pharma Services) and LSC

Master Services Agreement dated December 19, 2003, between MedSource Consulting,
Inc. and LSC

Purchase Order Number PO005480 dated March 9, 2004, sent by LSC to Minnetronix,
Inc.

Terms and Conditions Relating to Proposed Contract dated November 2004, between
Marilyn Emery Consulting and LSC

Sterilization Agreement Contract # PCS03C32 dated December 23, 2003, between
Professional Contract Sterilization, Inc. and LSC

Master Services Agreement dated January 14, 2004, between Statprobe, Inc. and
LSC

Assignment of Copyright dated February 28, 2002, by Prof. Marko Turic, M.D.,
Ph.D., to LSC

Sponsored Research Development Agreement dated May 20, 2001, between K.U. Leuven
Research and Development (Catholic University of Leuven), on behalf of
Laboratory of Experimental Radiobiology, and LSC

Clinical Trial Agreement dated March 30, 2005, between LSC and The University of
Hong Kong

Sponsored Research Agreement dated May 4, 2001, between University of Utah and
LSC

Sponsored Research Agreement #4 Preclinical dated January 15, 2004, between
Wayne State University, on behalf of its School of Medicine, and LSC

SCHEDULE B TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   SCHEDULE C

                                REQUIRED CONSENTS

Research and Manufacturing Agreement dated May 7, 2004, between Pharm-Eco
(Johnson-Matthey Pharma Services) and LSC

Master Services Agreement dated January 14, 2004, between Statprobe, Inc. and
LSC

SCHEDULE C TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   SCHEDULE D

                         CERTAIN TRANSFERRING EMPLOYEES

Jay Winship
Sy-Shi Wang
Alex Pallenberg
Liang Xu
Steven Daly
George Lane
Brenda Lee
Jeff Jellum
Nancy Glaser
Zihong Guo
Raj Kumar
Joe Hobbs
Julie Lester
Jeff Storm
Michael Vasquez

SCHEDULE D TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   SCHEDULE E

                    TRANSFERRING EMPLOYEES EXECUTING RELEASES

Jay Winship
Sy-Shi Wang
Alex Pallenberg
Liang Xu
Steven Daly
George Lane
Brenda Lee
Jeff Jellum
Nancy Glaser
Zihong Guo
Raj Kumar
Joe Hobbs
Julie Lester
Jeff Storm
Michael Vasquez

SCHEDULE E TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   EXHIBIT A-1

                          BILL OF SALE FOR DRUG PRODUCT

EXHIBIT A-1 TO ASSET TRANSFER AGREEMENT

<PAGE>

                          BILL OF SALE FOR DRUG PRODUCT

     This Bill of Sale is made and entered into as of October 5, 2005, by and
between: Light Sciences Corporation, a Washington corporation ("LSC"), and Light
Sciences Oncology, Inc., a Washington corporation ("LSO"), pursuant to that
certain Asset Transfer Agreement between LSC and LSO, dated October 5, 2005
("Asset Transfer Agreement"). LSC and LSO agree as follows:

     1. TRANSFER. LSC hereby sells, assigns, transfers and conveys to LSO all of
the talaporfin sodium drug product in bulk and finished form in the control or
possession of LSC, including, without limitation, the drug product described in
attached Schedule A and all packaging therefor ("Drug Product") and all related
tangible and electronic certificates, data, documents, files, results and
records in the control or possession of LSC as of the date of this Bill of Sale
("Records"). Further, LSC hereby assigns to LSO all of the warranties with
respect to the Drug Product and raw materials used to manufacture the Drug
Product made by the applicable manufacturers or suppliers thereof. To the extent
such warranties cannot be assigned to LSO, LSC will enforce such warranties for
the benefit of LSO at LSO's expense, unless otherwise agreed upon by the
parties.

     2. TAXES. LSO will promptly pay or reimburse LSC for all sales, use or
similar taxes arising from the transfer of the Drug Product and Records under
this Bill of Sale.

     3. DELIVERY. LSC will deliver the Drug Product to LSO at the location(s)
where the Drug Product is located as of the date of this Bill of Sale. LSC will
deliver the Records to LSO at LSO's principal place of business.

     4. LSC'S WARRANTIES. LSC represents and warrants that: (a) the Drug Product
was manufactured in accordance with all applicable laws and regulations,
including, without limitation, Current Good Manufacturing Practice (as
promulgated by the FDA and ICH and referred to herein as "cGMP"); (b) the Drug
Product and raw materials used to manufacture the Drug Product comply with the
warranties set forth in the agreements under which the Drug Product and such raw
materials were manufactured or supplied to LSC; (c) the Drug Product has been
stored and handled in accordance with the written procedures for holding and
warehousing the Drug Product established and required under cGMP and any other
applicable laws or regulations; and (d) the Records are accurate and complete.
THE REPRESENTATIONS AND WARRANTIES SET FORTH IN THIS SECTION 5 AND THE ASSET
TRANSFER AGREEMENT ARE EXCLUSIVE AND IN LIEU OF ANY AND ALL OTHER WARRANTIES OF
LSC WITH RESPECT TO THE DRUG PRODUCT. LSC

EXHIBIT A-1 TO ASSET TRANSFER AGREEMENT

<PAGE>

DISCLAIMS ANY AND ALL OTHER EXPRESS OR IMPLIED WARRANTIES OF ANY KIND WITH
RESPECT TO THE DRUG PRODUCT, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY
OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE.

     5. SUCCESSORS AND ASSIGNS. This Bill of Sale will be binding upon, inure to
the benefit of and be enforceable by each of the parties and their respective
permitted successors and assigns.

     6. ENTIRE AGREEMENT. This Bill of Sale (including the attached or
referenced Schedules) and the Asset Transfer Agreement constitute the entire
agreement, and supersede any and all prior agreements, between the parties with
regard to the transfer of the Drug Product and Records. In the event of any
conflict between any provision of this Bill of Sale and any provision of the
Asset Transfer Agreement with respect to the transfer of the Drug Product and
Records, the provision of this Bill of Sale will control. No amendment,
modification or waiver of any provision of this Bill of Sale will be valid
unless set forth in a written instrument signed by the party to be bound
thereby.

     IN WITNESS WHEREOF, the parties have entered into this Bill of Sale as of
the date first set forth above.

LSC:                                    LSO:

LIGHT SCIENCES CORPORATION              LIGHT SCIENCE ONCOLOGY, INC.

By /s/ Albert Luderer                   By /s/ M. J. Winship
   ----------------------------------      -------------------------------------
Printed Name Albert Luderer             Printed Name M. J. Winship
Title CEO                               Title COO

EXHIBIT A-1 TO ASSET TRANSFER AGREEMENT
<PAGE>

                                   SCHEDULE A
                                       TO
                          BILL OF SALE FOR DRUG PRODUCT

                              DRUG SUBSTANCE (API)

<TABLE>
<CAPTION>
   Lot No. (DOM)     Amount
   -------------     ------
<S>                  <C>
3225.A.05.2 (5-05)   1.0 kg
TBD (8-05)           1.5 kg
</TABLE>

                              DRUG PRODUCT (VIALED)

<TABLE>
<CAPTION>
  Lot No. (DOM)      Amount
  -------------    ----------
<S>                <C>
WCS-037 (6-02)       39 vials(1)
1406-9 (3-26-02)    354 vials
804430 (8-18-04)   1549 vials
900241 (3-05)      1688 vials
</TABLE>

(1)  currently stored at ambient for destruction

EXHIBIT A-1 TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   EXHIBIT A-2

                           BILL OF SALE FOR EQUIPMENT

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

                           BILL OF SALE FOR EQUIPMENT

     This Bill of Sale is made and entered into as of October 5, 2005, by and
between: Light Sciences Corporation, a Washington corporation ("LSC"), and Light
Sciences Oncology, Inc., a Washington corporation ("LSO"), pursuant to that
certain Asset Transfer Agreement between LSC and LSO, dated October 5, 2005
("Asset Transfer Agreement"). LSC and LSO agree as follows:

     1. TRANSFER. LSC hereby sells, assigns, transfers and conveys to LSO all of
the equipment, devices and other assets described in attached Schedule A
("Equipment"). Further, LSC hereby assigns to LSO all of the warranties with
respect to the Equipment made by the applicable manufacturers or suppliers
thereof. To the extent such warranties cannot be assigned to LSO, LSC will
enforce such warranties for the benefit of LSO at LSO's expense.

     2. TAXES. LSO will promptly pay or reimburse LSC for all sales, use or
similar taxes arising from the transfer of the Equipment under this Bill of
Sale.

     3. DELIVERY. LSC will deliver the Equipment to LSO at the location(s) where
the Equipment is located as of the date of this Bill of Sale.

     4. SUCCESSORS AND ASSIGNS. This Bill of Sale will be binding upon, inure to
the benefit of and be enforceable by each of the parties and their respective
permitted successors and assigns.

     5. ENTIRE AGREEMENT. This Bill of Sale (including the attached or
referenced Schedules) and the Asset Transfer Agreement constitute the entire
agreement, and supersede any and all prior agreements, between the parties with
regard to the transfer of the Equipment. In the event of any conflict between
any provision of this Bill of Sale and any provision of the Asset Transfer
Agreement with respect to the transfer of the Equipment, the provision of this
Bill of Sale will control. No amendment, modification or waiver of any provision
of this Bill of Sale will be valid unless set forth in a written instrument
signed by the party to be bound thereby.

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

     IN WITNESS WHEREOF, the parties have entered into this Bill of Sale as of
the date first set forth above.

LSC:                                    LSO:

LIGHT SCIENCES CORPORATION              LIGHT SCIENCE ONCOLOGY, INC.

By /s/ Albert Luderer                   By /s/ M. J. Winship
   ----------------------------------      -------------------------------------
Printed Name Albert Luderer             Printed Name M. J. Winship
Title CEO                               Title COO

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

                                   SCHEDULE A
                                       TO
                           BILL OF SALE FOR EQUIPMENT

<TABLE>
<CAPTION>
ASSET ID   ASSET DESCRIPTION
--------   -----------------
<S>        <C>
  0023     Video Camera System for Microscope
  0026     McMaster Mini Drill Press
  0027     Vacuum Pump
  0028     Complete XYZ Table w/Readouts & Scales
  0031     Unitek Micropull 3 Wire Tester
  0036     Stereo Microscope w/accessories
  0060     Dell XPS T550 Computer System
  0066     Stereo Microscope
  0083     Water Bath w/Circ Htg Digt
  0087     Dell Latitude CSR 400XT Laptop
  0098     Dell XPS T500 PIII Computer System
  0109     3565 D Hypo TII Tester
  0110     LT-601 Leakage Tester
  0116     Fiber Optic Spectrometer
  0120     LaserCare PDT 665-2 S/N 152
  0142      Dell Dimension XPS B800MHz  P3
  0146     Solidworks 2000 + Photo & Anim
  0148     Dell Dimension XPS866 PIII
  0149     Dell Dimension XPS866 PIII
  0150     45 Watt Total Spectral Flux Lamp Standar
  0158     Fireproof Black Lateral File
  0163     TracePro Standard - Engineering Software
  0170     Dell Latitude L400 700 MHz PIII Laptop
  0173     GP-400 Thermo Neslab Waterbath w/Cover
  0177     USB Temp & Voltage Inst w/LabView
  0178     Optical Power Meter w/EPROM & Memory Mod
  0185     Handheld Pulsed Wave Ultrasound Doppler
  0186     Lamp Std: Total Spectral Radiant Flux
  0187     250mW 664nM Laser
  0188     Latitude L400 Laptop
  0189     Latitude L400 Laptop
  0301     Mitutoyo Toolmaker's Microscope
  0311     Lung Model with Carrying Case
</TABLE>

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

<TABLE>
<S>        <C>
  0313     4 Axis Goniometer (Vexta Stepper Motor)
  0315     Dell Dimension 4500S P4 2.0GHz Desktop
  0325     Chatillon TCD 200lb Digital Test Stand
  0326     Chatillon DFGS10 Digital Force Gauge
  0328     SmartDesiccator Benchtop Storage System
  0343     Olympus BF-1T10  Fiberoptic Bronchoscope
  0344     2" Diameter Red Fluorescent Spectralon
  0350     Dell Dimension 4500 P4 3.06GHz Desktop
  0356     Balloon Development System, Model 210-A
  0358     Programmable Motion System
  0368     Dell Dimension 4600 3.2 GHz System
  0369     OLTSF-245 Std Total Luminous/Spectr Flux
  0378     Schwab 4 Drawer Fire-Proof File Cabinet
  0385     Dell Latitude D400 Laptop Computer
  0386     Apple PowerBook 15" Laptop Computer
  0393     Apple Cinema 23" Monitor
  0395     Nikon Stereo Zoom Microscope
  0396     Unibond Linear DC Resistance Welding PS
  0397     Light Force Vertical Motion Weld Head
  0401     Dell Latitude D600 Laptop
  0412     Plastic Fiber Optic Ring Illuminator
  0416     Dell Dimension 4600 P4 2.8GHz HT Tech
  0436     BISLIDE 30" 10P LIMIT SWITCH w/Cleats
  0452     OptiPlex GX280 P4 3.0GHz Computer Sys
  0462     Multi-Channel Spectroradiometer OL770VIS
  0463     OL IS-1800 18" Integrating Sphere w/Lamp
  0464     OL 65A Programmable Current Source
  0479     Dell Latitude D510 Laptop Computer
  0482     Latitude 510 1.6Ghz 60GB 14"XGA Screen
  0485     Mitutoyo PJ-A3000 w/accessories
  0521     OptiPlex GX280 Minitower P4 530 w/3.0GHz
  0523     Dell D600 Latitude Pentium M 755
  0526     FireKing, Black Lateral Fireproof File
  0527     Light Source Design/Fabricate Tray Proto
  0532     Balloon Development System
  0539     Meiji EMZ-8TR Stereo Zoom Microscope
           Preparative HPLC
           Add'l lens for Microscope
</TABLE>

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

   All Light Bars in the control or possession of LSC developed, manufactured
      or supplied by Agilent Technologies Malaysia SDN BHD and all related
                           documentation and records.

EXHIBIT A-2 TO ASSET TRANSFER AGREEMENT

<PAGE>

                                    EXHIBIT B

                               SUBLEASE AGREEMENT

EXHIBIT B TO ASSET TRANSFER AGREEMENT

<PAGE>

                                    EXHIBIT C

                           EXCLUSIVE LICENSE AGREEMENT

EXHIBIT C TO ASSET TRANSFER AGREEMENT

<PAGE>

                                    EXHIBIT D

                              SUBLICENSE AGREEMENT

EXHIBIT D TO ASSET TRANSFER AGREEMENT

<PAGE>

                                    EXHIBIT E

                            CLINICAL SUPPLY AGREEMENT

EXHIBIT E TO ASSET TRANSFER AGREEMENT

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