<PAGE>


                                                                   EXHIBIT 10.40

                            EQUIPMENT LEASE AGREEMENT
                            -------------------------

     THIS EQUIPMENT LEASE AGREEMENT ("Agreement") is made and entered into on
September 13, 2001, by and between GK FINANCING, LLC, a California limited
liability company ("GKF"), and Mercy Medical Center a non-profit New York
corporation ("Hospital"), with reference to the following facts:

                                 R E C I T A L S

     WHEREAS, Hospital wants to lease a Leksell Stereotactic Gamma Unit, model C
without Automatic Positioning System, manufactured by Elekta Instruments, Inc.,
a Georgia corporation ("Elekta"); and

     WHEREAS, GKF has acquired the Equipment from Elekta, and GKF is willing to
lease the Equipment to Hospital pursuant to the terms and conditions of this
Agreement.

                                A G R E E M E N T

     NOW, THEREFORE, in consideration of the mutual covenants, conditions and
agreements set forth herein, and for such other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

     1.   Lease. Subject to and in accordance with the covenants and conditions
          -----
set forth in this Agreement, GKF hereby leases to Hospital, and Hospital hereby
leases from GKF, the Equipment. The Equipment to be leased to Hospital pursuant
to this Agreement shall include the Gamma Knife technology as specified in
Exhibit 1, including all hardware and software related thereto.

     2.   LGK Agreement. Simultaneously with the execution of this Agreement,
          -------------
Hospital and Elekta shall enter into that certain LGK Agreement (the "LGK
Agreement"), a copy of which is attached hereto as Exhibit 1. Hospital shall
perform, satisfy and fulfill all of its obligations arising under the LGK
Agreement when and as required thereunder. Hospital acknowledges that GKF is a
third party beneficiary of the LGK Agreement and, in that capacity, GKF shall be
entitled to enforce Hospital's performance, satisfaction and fulfillment of its
obligations thereunder.

     3.   Term of the Agreement. The initial term of this Agreement (the "Term")
          ---------------------
shall commence as of the date hereof and, unless earlier terminated or extended
in accordance with the provisions of this Agreement, shall continue for a period
of ten (10) years following the date of the performance of the first clinical
Gamma Knife procedure (the "First Procedure Date") at the Site. Hospital's
obligation to make the rental payments to GKF for the Equipment described in


                                       1

<PAGE>

Section 8 below shall commence as of the First Procedure Date, all other
obligations, duties and covenants of GKF and Hospital shall commence as of the
date hereof.

     4.   Certificate of Need; User License.
          ---------------------------------

          4.1  GKF acknowledges that Hospital will require a certificate of need
("CON") issued by the applicable state health planning agency in order to
install and operate the Equipment at the Site. As soon as reasonably possible
following the date of this Agreement, Hospital shall apply for and use its best
efforts to obtain in a timely manner a CON for the installation and use of the
Equipment at the Site. In the event Hospital's application for a CON is denied,
this Agreement shall automatically terminate and all parties shall be released
from the further performance of any obligations or duties arising under this
Agreement.

          4.2  Hospital shall apply for and obtain in a timely manner a User
License from the Nuclear Regulatory Commission and, if necessary, from the
applicable state agency authorizing it to take possession of and maintain the
Cobalt supply required in connection with the use of the Equipment during the
term of this Agreement. Hospital also shall apply for and obtain in a timely
manner all other licenses, permits, approvals, consents and authorizations which
may be required by state or local governmental or other regulatory agencies for
the development, construction and preparation of the Site, the charging of the
Equipment with its Cobalt supply, the conduct of acceptance tests with respect
to the Equipment, and the use of the Equipment during the Term, as more fully
set forth in Article 2.2 of the LGK Agreement.

     5.   Delivery of Equipment; Site.
          ---------------------------

          5.1  GKF shall coordinate with Elekta and Hospital to have the
Equipment delivered to Hospital at ___________________ (the "Site") on or prior
to the delivery date agreed upon by Hospital and GKF, GKF will notify Hospital
in writing of the delivery date provided to them by Elekta. GKF makes no
representations or warranties concerning delivery of the Equipment to the Site
or the actual date thereof. If, at Hospital's request, the Equipment is
delivered FOB to a location other than the Site, Hospital agrees to be
responsible for any and all costs incurred in transporting the Equipment to
Hospital, including but not limited to insurance, rigging, delivery.

          5.2  Hospital, at its cost and expense, shall provide a safe,
convenient and properly prepared Site for the Equipment in accordance with
Elekta's guidelines, specifications, technical instructions and site planning
criteria (which site planning criteria are attached as Exhibit B to the LGK
Agreement) (collectively the "Site Planning Criteria"). The location of the Site
shall be subject to the prior approval of GKF.

     6.   Site Preparation and Installation of Equipment.
          ----------------------------------------------




                                       2
<PAGE>

          6.1  Hospital, at its cost, expense and risk, shall prepare all
plans and specifications required to construct and improve the Site for the
installation, use and operation of the Equipment during the Term. The plans and
specifications shall comply in all respects with the Site Planning Criteria and
with all applicable federal, state and local laws, rules and regulations. All
plans and specifications prepared by or on behalf of Hospital (and all material
changes thereto following approval by GKF and Elekta) shall be subject to the
written approval of GKF and Elekta prior to commencement of construction at the
Site. Hospital shall provide GKF and Elekta with a reasonable period of time for
the review and consideration of all plans and specifications following the
submission thereof for approval. Following approval of the plans and
specifications by GKF and Elekta, Hospital, at its cost and expense, shall
obtain all permits, certifications, approvals or authorizations required by
applicable federal, state or local laws, rules or regulations necessary to
construct and improve the Site for the installation, use and operation of the
Equipment.

          6.2  Based upon the plans and specifications approved by GKF and
Elekta, Hospital, at its cost, expense and risk, shall prepare, construct and
improve the Site as necessary for the installation, use and operation of the
Equipment during the Term, including, without limitation, providing all
temporary or permanent shielding required for the charging of the Equipment with
the Cobalt supply and for its subsequent use, selecting and constructing a
proper foundation for the Equipment and the temporary or permanent shielding,
aligning the Site for the Equipment, and installing all electrical systems and
other wiring required for the Equipment. In connection with the construction of
the Site, Hospital, at its cost and expense, shall select, purchase and install
all radiation monitoring equipment, devices, safety circuits and radiation
warning signs required at the Site in connection with the use and operation of
the Equipment, all in accordance with applicable federal, state and local laws,
rules, regulations or custom.

          6.3  In addition to construction and improvement of the Site,
Hospital, at its cost, expense and risk, shall be responsible for the
installation of the Equipment at the Site, including the positioning of the
Equipment on its foundation at the Site in compliance with the Site Planning
Criteria. Elekta provides set up of Equipment once installed.

          6.4  Upon completion of construction, the Site shall (a) comply in all
respects with the Site Planning Criteria and all applicable federal, state and
local laws, rules and regulations, and (b) be safe and suitable for the ongoing
use and operation of the Equipment during the Term.

          6.5  Hospital shall use its best efforts to satisfy its
obligations under this Section 6 in a timely manner. Hospital shall keep GKF
informed on a regular basis of its progress in the design of the Site, the
preparation of plans and specifications, the construction and improvement of the
Site, and the satisfaction of its other obligations under this Section 6. In all
events, Hospital shall complete all construction and improvement of the Site
required for the installation, positioning and testing of the Equipment on or
prior to the delivery date described in Section 5.1 above. If the Site is not
complete as of the delivery date described in Section 5.1



                                       3
<PAGE>

above plus a sixty (60) day grace period (other than by reasons of force majeure
as provided in Section 23 below) (the "late completion date"), Hospital shall
reimburse GKF for its out-of-pocket financing costs incurred with respect the
Equipment at the Bank of America prime interest rate (which rate is sometimes
referred to by the Bank as its "reference rate") plus 2% based upon GKF's cost
of the Equipment for the period between the late completion date and the date
that the Site is completed to the extent necessary to allow for the
installation, positioning and testing of the Equipment.

          6.6  During the Term, Hospital, at its cost and expense, shall
maintain the Site in a good working order, condition and repair, reasonable wear
and tear excepted.

          6.7  Hospital shall be liable for, and shall indemnify GKF in the
manner described in Section 22 below from and against, all damage to the
Equipment caused by (a) defects in construction of the Site or in installation
or positioning the Equipment at the Site; (b) defects arising out of materials
or parts provided, modified or designed by Hospital for or with respect to the
Site; (c) negligent, intentional or wrongful acts or omissions by Hospital or
any of its officers, directors, agents, contractors (or their subcontractors),
or employees in connection with the construction and preparation of the Site;
and (d) negligent or intentional and wrongful operation of the Equipment at the
Site. Further, neither the review and approval of Site plans, specifications
and/or positioning plans by GKF and/or Elekta, nor the construction of any other
Site preparation, shall relieve Hospital for liability for damages to the
Equipment caused by the failure to comply with applicable federal, state or
local laws or regulations, including building codes, or those portions of the
Site Planning Criteria relating to the load bearing capacity of the floor of the
treatment room and to radiation protection.

     7.   Marketing Support. GKF, in coordination with Hospital, shall provide
          -----------------
marketing support for the Gamma Knife service to be provided by Hospital. Not
less than ninety (90) days prior to the First Procedure Date and the
commencement of each succeeding twelve (12) month period during the Term, GKF
and Hospital shall develop a mutually agreed upon marketing budget and plan for
the clinical service to be supported by the Equipment for the succeeding twelve
(12) month period of the Term. Once approved, the marketing budget and plan
shall be implemented by Hospital in accordance with its terms. As funds are
expended by Hospital in accordance with the marketing budget and plan, Hospital
shall submit invoices (together with documentary evidence supporting the
invoices) for its expenditures and, promptly following the receipt of such
invoices, GKF shall reimburse Hospital for *  of the expenditures up to an
annual maximum of *. It is acknowledged by the parties that such expenses to be
reimbursed by GKF as provided in this Section 7 have been included in GKF's
calculation of Hospital's Lease Payments so as to allow GKF to recover such GKF
reimbursed expenses during the Term of this Agreement.

8.   Per Procedure Payments. As rent for the lease of the Equipment to
     ----------------------
Hospital pursuant to this Agreement and in consideration for GKF's reimbursement
of the amounts set forth in Section 7 above, Hospital shall pay to GKF the sum
of   *   for each "Procedure" that is performed by Hospital or its
representatives or affiliates, irrespective of whether the Procedure is
performed on the Equipment or using any other equipment or devices (the "Lease
Payment"). As



                                       4
<PAGE>

used herein, a "Procedure" means any treatment that involves stereotactic,
external, single fraction, conformal radiation, commonly called radiosurgery,
that may include one or more isocenters during the patient treatment session,
delivered to any site(s) superior to the foramen magnum.

     GKF shall submit a rent invoice to Hospital on the fifteenth (15th) and the
last day of each calendar month (or portion thereof) for the actual number of
Gamma Knife procedures performed during the first and second half of the
calendar month, respectively. Hospital shall pay the rent invoice within thirty
(30) days after submission by GKF to Hospital. All or any portion of a rent
invoice which is not paid in full within forty-five (45) days after submission
shall bear interest at the rate of one and one-half percent (1.50%) per month
(or the maximum monthly interest rate permitted to be charged by law between an
unrelated, commercial borrower and lender, if less) until the unpaid rent
invoice together with all accrued interest thereon is paid in full. If GKF shall
at any time accept a rent payment from Hospital after it shall become due, such
acceptance shall not constitute or be construed as a waiver of any or all of
GKF's rights under this Agreement, including the rights of GKF set forth in
Section 20 hereof.

     Within ten (10) days after Hospital's receipt of written request by GKF,
GKF shall have the right to audit Hospital's books and records (including,
without limitation, the books and records pertaining to any other radiosurgery
equipment or devices) to verify the number of Procedures that have been
performed by Hospital, and Hospital shall provide GKF with access to such books
and records; PROVIDED that any patient names or identifiers shall not be
disclosed.

     9.   Use of the Equipment.
          --------------------

          9.1  The Equipment shall be used by Hospital only at the Site and
shall not be removed therefrom. Hospital shall use the Equipment only in the
regular and ordinary course of Hospital's business operations and only within
the capacity of the Equipment as determined by Elekta's specifications. Hospital
shall not use nor permit the Equipment to be used in any manner nor for any
purpose which, in the opinion of Elekta or GKF, the Equipment is not designed or
reasonably suitable.

          9.2  This is an agreement of lease only. Nothing herein shall be
construed as conveying to Hospital any right, title or interest in or to the
Equipment, except for the express leasehold interest granted to Hospital for the
Term. All Equipment shall remain personal property (even though said Equipment
may hereafter become attached or affixed to real property) and the title thereto
shall at all times remain exclusively in GKF.

          9.3  During the Term, upon the request of GKF, Hospital shall promptly
affix to the Equipment in a prominent place, or as otherwise directed by GKF,
labels, plates, insignia, lettering or other markings supplied by GKF indicating
GKF's ownership of the Equipment, and shall keep the same affixed for the entire
Term. Hospital hereby authorizes GKF to cause this Lease or any statement or
other instrument showing the interest of GKF in the Equipment to be filed or
recorded, or refiled or re-recorded, with all governmental agencies considered




                                       5
<PAGE>

appropriate by GKF, at Hospital's cost and expense. Hospital also shall promptly
execute and deliver, or cause to be executed and delivered, to GKF any statement
or instrument requested by GKF for the purpose of evidencing GKF's interest in
the Equipment, including financing statements and waivers with respect to rights
in the Equipment from any owners or mortgagees of any real estate where the
Equipment may be located.

          9.4  At Hospital's cost and expense, Hospital shall (a) protect and
defend GKF's ownership of and title to the Equipment from and against all
persons claiming against or through Hospital, (b) at all times keep the
Equipment free from any and all liens, encumbrances, attachments, levies,
executions, burdens, charges or legal processes imposed against Hospital, (c)
give GKF immediate written notice of any matter described in clause (b), and (d)
in the manner described in Section 22 below indemnify GKF harmless from and
against any loss, cost or expense (including reasonable attorneys' fees) with
respect to any of the foregoing.

          10.  Additional Covenants of Hospital. In addition to the other
               --------------------------------
covenants of Hospital contained in this Agreement,  Hospital shall, at its cost
and expense:

          10.1 Provide properly trained professional, technical and support
personnel and supplies required for the proper performance of Gamma Knife
procedures utilizing the Equipment. In this regard, Hospital shall maintain on
staff a minimum of two (2) Gamma Knife trained teams comprised of neurosurgeons,
radiation oncologists and physicists. The Gamma Knife shall be available for use
by all credentialed neurosurgeons and radiation oncologists, subject to
Hospital's medical staff bylaws and Board of Trustees approval.

          10.2 Direct, supervise and administer all Hospital services in
connection with the provision of Gamma Knife procedures.

          10.3 Provide reasonable and customary marketing materials (i.e.
brochures, announcements, etc.) together with administrative and physician
support (e.g., seminars for physicians by neurosurgeons and radiation
oncologists, etc.) for the Gamma Knife service to be operated by the Hospital.

          10.4 Keep and maintain the Equipment and the Site fully protected,
secure and free from unauthorized access or use by any person.

     11.  Additional Covenants of GKF. In addition to the other covenants of GKF
          ---------------------------
contained in this Agreement, GKF, at its cost and expense, shall:

          11.1 Use its best efforts to require Elekta to meets its contractual
obligations to GKF and Hospital upon delivery of the Equipment and put the
Equipment, as soon as reasonably possible, into good, safe and serviceable
condition and fit for its intended use in accordance with the manufacturer's
specifications, guidelines and field modification instructions.



                                       6
<PAGE>

          11.2 Cause Hospital to enjoy the use of the Equipment, free of the
rights of any other persons except for those rights reserved by GKF or granted
to Elekta under the LGK Agreement.

     12.  Maintenance of Equipment; Damage or Destruction of Equipment.
          ------------------------------------------------------------

          12.1 During the Term and except as otherwise provided in this
Agreement, GKF, at its cost and expense, shall (a) maintain the Equipment in
good operating condition and repair, reasonable wear and tear excepted, and (b)
maintain in full force and effect a Service Agreement with Elekta and any other
service or other agreements required to fulfill GKF's obligation to repair and
maintain the Equipment under this Section 12. Hospital shall promptly notify GKF
in the event of any damage or destruction to the Equipment or of any required
maintenance or repairs to the Equipment that are known to Hospital, regardless
of whether such repairs or maintenance are covered or not covered by the Service
Agreement. GKF shall pursue all remedies available to it under the Service
Agreement and under any warranties made by Elekta with respect to the Equipment
so that the Equipment will be free from defects in design, materials and
workmanship and will conform to Elekta's technical specifications concerning the
Equipment.

          12.2 GKF and Elekta shall have the right to access the Equipment for
the purpose of inspection and the performance of repairs at all reasonable
times, upon reasonable advance notice and with a minimum of interference or
disruptions to Hospital's regular business operations.

          12.3 Hospital shall be liable for, and in the manner described in
Section 22 below shall indemnify GKF from and against, any damage to or
destruction of the Equipment caused by the misuse, improper use, or other
intentional and wrongful or negligent acts or omissions of Hospital's officers,
employees, agents, contractors and physicians. In the event the Equipment is
damaged as a result of the misuse, improper use, or other intentional and
wrongful or negligent acts or omissions of Hospital officers, employees, agents,
contractors and physicians, to the extent such damage is not covered by the
Service Agreement or any warranties or insurance, GKF may service or repair the
Equipment as needed and the cost thereof shall be paid by Hospital to GKF within
thirty (30) days following GKF's written request therefore. If such costs are
not paid in full when due, Hospital shall pay GKF interest on such unpaid costs
which interest shall accrue from the due date of such costs until paid in full
at the rate of one and one-half percent (1.50%) per month (or the maximum
monthly interest rate permitted to be charged by law between an unrelated,
commercial borrower and lender, if less) plus reasonable attorneys' fees and
costs incurred by GKF in collecting such amount from Hospital. Any work so
performed by GKF shall not deprive GKF of any of its rights, remedies or actions
against Hospital for such damages.

          12.4 If the Equipment is rendered unusable as a result of any physical
damage to or destruction of the Equipment, Hospital shall give GKF written
notice thereof. GKF shall



                                       7
<PAGE>

determine, within thirty (30) days after it is given written notice of such
damage or destruction, whether the Equipment can be repaired. In the event GKF
determines that the Equipment cannot be repaired (a) GKF, at its cost and
expense, shall replace the Equipment as soon as reasonably possible taking into
account the availability of replacement equipment from Elekta, Elekta's other
then existing orders for equipment, and the then existing limitations on
Elekta's manufacturing capabilities, and (b) this Agreement shall continue in
full force and effect as though such damage or destruction had not occurred. In
the event GKF determines that the Equipment can be repaired, GKF shall cause the
Equipment to be repaired as soon as reasonably possible thereafter. Hospital
shall fully cooperate with GKF to effect the replacement of the Equipment or the
repair of the Equipment (including, without limitation, providing full access to
the Site) following the damage or destruction thereof.

     13.  Alterations and Upgrades to Equipment.
          -------------------------------------

          13.1 Hospital shall not make any modifications, alterations or
additions to the Equipment (other than normal operating accessories or controls)
without the prior written consent of GKF. Hospital shall not, and shall not
permit any person other than representatives of Elekta or any other person
authorized by GKF to, effect any inspection, adjustment, preventative or
remedial maintenance, or repair to the Equipment without the prior written
consent of GKF. All modifications, alterations, additions, accessories or
operating controls incorporated in or affixed to the Equipment (herein
collectively called "additions" and included in the definition of "Equipment")
shall become the property of the GKF upon termination of this Agreement.

          13.2 The necessity and financial responsibility for modifications,
additions or upgrades to the Equipment, including the reloading of the Cobalt-60
source, shall be mutually agreed upon by GKF and Hospital. In the event GKF and
Hospital agree to reload the Cobalt-60 source (i.e., in approximately the eighth
(8th) year of the Term), and GKF pays the costs associated therewith,
notwithstanding any provisions to the contrary herein, the initial Term shall be
automatically extended for a negotiated period of time.

     14.  Financing of Equipment by GKF. GKF, in its sole discretion, may
          -----------------------------
finance the Equipment. Financing may be in the form of an installment loan, a
capitalized lease or other commercially available debt or financing instrument.
If GKF finances the Equipment through an installment loan, GKF shall be required
to provide the Equipment as collateral for the loan. If GKF finances the
Equipment through a capitalized lease, title shall vest with the lessor until
such time as GKF exercises its buy-out option under the lease, if any. If
required by the lender, lessor or other financing entity (the "Lender"), GKF may
assign its interest under this Agreement as security for the financing. Hospital
interest under this Agreement shall be subject to the interests of the Lender.

     15.  Equipment Operational Costs. Except as otherwise expressly provided in
          ---------------------------
this Agreement, Hospital shall be responsible and liable for all costs and
expenses incurred, directly or indirectly, in connection with the operation and
use of the Equipment during the Term,



                                       8
<PAGE>

including, without limitation, the costs and expenses required to provide
trained physicians, professionals, and technical and support personnel, supplies
and other items required to properly operate the Equipment and perform Gamma
Knife procedures. Between Hospital and GKF, Hospital shall be fully liable for,
and in the manner described in Section 22 below shall indemnify and hold GKF
harmless from and against, all negligent, intentional or wrongful acts or
omissions of such physicians, professional, technical and support personnel.

     16.  Taxes. GKF shall pay all sales or use taxes imposed or assessed in
          -----
connection with the purchase of the Equipment and all personal property taxes
imposed, levied or assessed on the ownership and possession of the Equipment
during the Term. All other taxes, assessments, licenses or other charges
imposed, levied or assessed on the Equipment during the Term shall be paid by
Hospital before the same shall become delinquent, whether such taxes are
assessed or would ordinarily be assessed against GKF or Hospital; provided,
however, Hospital shall not be required to pay any federal, state or local
income, franchise, corporation or excise taxes imposed upon GKF's net income
realized from the lease of the Equipment. In case of a failure by Hospital to
pay any taxes, assessments, licenses or other charges when and as required under
this Section, GKF may pay all or any part of such taxes, in which event the
amount paid by GKF shall be immediately payable by Hospital to GKF upon written
request together with interest thereon at the rate of at the rate of one and
one-half percent (1.50%) per month (or the maximum monthly interest rate
permitted to be charged by law between an unrelated, commercial borrower and
lender, if less) and reasonable attorneys' fees and costs incurred by GKF in
collecting such amount from Hospital.

     17.  No Warranties by GKF. Hospital warrants that as of the First Procedure
          --------------------
Date, it shall have (a) thoroughly inspected the Equipment, (b) determined that
the Equipment is consistent with the size, design, capacity and manufacture
selected by it, and (c) satisfied itself that to the best of its knowledge the
Equipment is suitable for Hospital intended purposes and is good working order,
condition and repair. GKF SUPPLIES THE EQUIPMENT UNDER THIS AGREEMENT IN ITS "AS
IS" CONDITION. GKF, NOT BEING THE MANUFACTURER OF THE EQUIPMENT OR THE
MANUFACTURER'S AGENT, MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESSED OR
IMPLIED, AS TO THE EQUIPMENT'S MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
OR USE, DESIGN, CONDITION, DURABILITY, CAPACITY, MATERIAL OR WORKMANSHIP OR AS
TO PATENT INFRINGEMENT OR THE LIKE. As between GKF and Hospital, Hospital shall
bear all risks with respect to the foregoing warranties. GKF shall not be liable
for any direct, indirect and consequential losses or damages suffered by
Hospital or by any other person, and Hospital expressly waives any right to hold
GKF liable hereunder for, any claims, demands and liabilities arising out of or
in connection with the design, manufacture, possession or operation of the
Equipment, including injury to persons or property resulting from the failure
of, defective or faulty design, operation, condition, suitability or use of the
Equipment. All warranty or other similar claims with respect to the Equipment
shall be made by Hospital solely and exclusively against persons other than GKF,
including Elekta or any other manufacturers or suppliers. In this regard and
with prior written approval of GKF, Hospital may, in GKF's name, but at



                                       9
<PAGE>

Hospital sole cost and expense, enforce all warranties, agreements or
representations, if any, which may have been made by Elekta or manufacturers,
suppliers or other third parties regarding the Equipment to GKF or Hospital. GKF
shall not be responsible for the delivery, installation or operation of the
Equipment or for any delay or inadequacy of any or all of the foregoing.

     18.  Termination for Economic Justification. If, following the initial
          --------------------------------------
twenty four (24) months after the First Procedure Date and following each
subsequent 12 month period thereafter during the Term, based upon the
utilization of the Equipment and other factors considered relevant by GKF in the
exercise of its discretion, within a reasonable period of time after GKF's
written request, Hospital does not provide GKF with a reasonable economic
justification to continue this Agreement and the provision of Gamma Knife
services at the Hospital, then and in that event, GKF shall have the option to
terminate this Agreement by giving a written notice thereof to Hospital not less
than ninety (90) days prior to the effective date of the termination designated
in GKF's written notice.

     19.  Options to Extend Agreement. As of the end of the Term, Hospital shall
          ---------------------------
have the option either to:

          19.1 Extend the Term of this Agreement for a specified period of time
and upon such other terms and conditions as may be agreed upon by GKF and
Hospital;

          19.2 Terminate this Agreement as of the expiration of the Term.

Hospital shall exercise one (1) of the two (2) options referred to above by
giving an irrevocable written notice thereof to GKF at least nine (9) months
prior to the expiration of the Term. Any such notice shall be sufficient if it
states in substance that Hospital elects to exercise its option and states which
of the two (2) options referred to above Hospital is exercising. If Hospital
fails to exercise the option granted herein at least nine (9) months prior to
the expiration of the initial Term, the option shall lapse and this Agreement
shall expire as of the end of the initial Term. Further, if Hospital exercises
the option specified in Section 19.1 above and the parties are unable to
mutually agree upon the length of the extension of the Term or any other terms
or conditions applicable to such extension prior to the expiration of the Term,
this Agreement shall expire as of the end of the Term.

     20.  Events of Default by Hospital and Remedies.
          ------------------------------------------

          20.1 The occurrence of any one of the following shall constitute an
event of default under this Agreement (an "Event of Default"):

               20.1.1 Hospital fails to pay any rent payment when due pursuant
to Paragraph 8 above and such failure continues for a period of fifteen (15)
days after written notice thereof is given by GKF or its assignee to Hospital;
however, if Hospital cures the rent payment default within the applicable
fifteen (15) day period, such default shall not constitute an Event of Default.



                                       10
<PAGE>

               20.1.2 Hospital attempts to remove, sell, transfer, encumber,
assign, sublet or part with possession of the Equipment or any items thereof,
except as expressly permitted herein.

               20.1.3 Hospital fails to observe or perform any of its covenants,
duties or obligations arising under this Agreement or the LGK Agreement and such
failure continues for a period of thirty (30) days after written notice thereof
by GKF to Hospital; however, if Hospital cures the default within the applicable
thirty (30) day period or if the default reasonably requires more than thirty
(30) days to cure, Hospital commences to cure the default during the initial
thirty (30) day period and Hospital diligently completes the cure as soon as
reasonably possible following the end of the thirty (30) day period, such
default shall not constitute an Event of Default.

               20.1.4 Hospital ceases doing business as a going concern, makes
an assignment for the benefit of creditors, admits in writing its inability to
pay its debts as they become due, files a voluntary petition in bankruptcy, is
adjudicated a bankrupt or an insolvent, files a petition seeking for itself any
reorganization, arrangement, composition, readjustment, liquidation, dissolution
or similar arrangement under any present or future statute, law or regulation or
files an answer admitting the material allegations of a petition filed against
it in any such proceeding, consents to or acquiesces in the appointment of a
trustee, receiver, or liquidator of it or of all or any substantial part of its
assets or properties, or it or its shareholders shall take any action looking to
its dissolution or liquidation.

               20.1.5 Within sixty (60) days after the commencement of any
proceedings against Hospital seeking reorganization, arrangement, readjustment,
liquidation, dissolution or similar relief under any present or future statute,
law or regulation, such proceedings shall not have been dismissed, or if within
thirty (30) days after the appointment without Hospital consent or acquiescence
of any trustee, receiver or liquidator of it or of all or any substantial part
of its assets and properties, such appointment shall not be vacated.

               20.1.6 Hospital is suspended or terminated from participation in
the Medicare program.

          20.2 Upon the occurrence of an Event of Default with respect to
Hospital, GKF may at its option do any or all of the following:

               20.2.1 By written notice to Hospital, immediately terminate this
Agreement as to the Equipment, wherever situated. As a result of the
termination, GKF may enter upon the Site and remove the Equipment without
liability of any kind or nature for so doing or GKF may demand that Hospital
remove and return the Equipment to GKF, all at Hospital sole cost and expense.

               20.2.2 Recover from Hospital as liquidated damages for the loss
of the bargain represented by this Agreement and not as a penalty an amount
equal to the present value



                                       11

<PAGE>

of the unpaid estimated future rent payments to be made by Hospital to GKF
through the end of the Term discounted at the rate of nine percent (9%), which
liquidated damages shall become immediately due and payable. The unpaid
estimated future lease payments shall be based on the prior twelve (12) months
rent payments made by Hospital to GKF hereunder with an annual five (5%) percent
increase thereof through the end of the Term. Hospital and GKF acknowledge that
the liquidated damages formula set forth in this Section 20.2.2 constitutes a
reasonable method to calculate GKF's damages resulting from an Event of Default
under the circumstances existing as of the date of this Agreement.

               20.2.3 Sell, dispose of, hold, use or lease the Equipment, as GKF
in its sole and absolute discretion may determine (and GKF shall not be
obligated to give preference to the sale, lease or other disposition of the
Equipment over the sale, lease or other disposition of similar Equipment owned
or leased by GKF).

               20.2.4 Exercise any other right or remedy which may be available
to GKF under the Uniform Commercial Code or any other applicable law or proceed
by appropriate court action, without affecting GKF's title or right to
possession of the Equipment, to enforce the terms hereof or to recover damages
for the breach hereof or to cancel this Agreement as to the Equipment.

               20.2.5 In addition to the foregoing remedies, Hospital shall be
liable to GKF for all reasonable attorneys fees, costs and expenses incurred by
GKF as a result of the Event of Default or the exercise of GKF's remedies.

          20.3 Upon termination of this Agreement or the exercise of any other
rights or remedies under this Agreement or available under applicable law
following an Event of Default, Hospital shall, without further request or
demand, pay to GKF all rent payments and other sums owing under this Agreement.
In the event that Hospital shall pay the liquidated damages referred to in
Section 20.2.2 above to GKF, GKF shall pay to Hospital promptly after receipt
thereof all rentals or proceeds received from the reletting or sale of the
Equipment during the balance of the initial Term (after deduction of all costs
and expenses, including reasonable attorneys fees and costs, incurred by GKF as
a result of the Event of Default), said amount never to exceed the amount of the
liquidated damages paid by Hospital. However, Hospital acknowledges that GKF
shall have no obligation to sell the Equipment. GKF will use good faith efforts
to release or resell Equipment. Hospital shall in any event remain fully liable
for all damages as may be provided by law and for all costs and expenses
incurred by GKF on account of such default, including but not limited to, all
court costs and reasonable attorneys' fees. The rights and remedies afforded GKF
under this Agreement shall be deemed cumulative and not exclusive, and shall be
in addition to any other rights or remedies to GKF provided by law or in equity.
The terms and provisions of this Section shall survive the expiration or earlier
termination of this Agreement.

     21. Insurance.
         ---------



                                       12

<PAGE>

          21.1 During the Term, GKF shall, at its cost and expense, purchase and
maintain in effect an all risk property and casualty insurance policy covering
the Equipment. The all risk property and casualty insurance policy shall be for
an amount not less than the replacement cost of the Equipment. Hospital shall be
named as an additional insured party on the all risk property and casualty
insurance policy to the extent of its interest in the Equipment arising under
this Agreement. The all risk property and casualty insurance policy maintained
by GKF shall be evidenced by a certificate of insurance or other reasonable
documentation which shall be delivered by GKF to Hospital upon request following
the commencement of this Agreement and as of each annual renewal of such policy
during the Term.

          21.2 During the Term, Hospital shall, at its cost and expense,
purchase and maintain in effect general liability and professional liability
insurance policies covering the Site (together with all premises where the Site
is located) and the use or operation of the Equipment by Hospital or its
officers, directors, agents, employees, contractors or physicians. The general
liability and professional liability insurance policies shall provide coverage
in amounts not less than One Million Dollars ($1,000,000.00) per occurrence and
Five Million Dollars ($5,000,000.00) annual aggregate. GKF shall be named as
additional insured party on the general liability and professional liability
insurance policies to be maintained hereunder by Hospital. The policies to be
maintained by Hospital hereunder shall be evidenced by a certificate of
insurance or other reasonable documentation which shall be delivered by Hospital
to GKF no later than the First Procedure Date and as of each annual renewal of
such policies during the Term.

          21.3 During the construction of the Site and prior to the First
Procedure Date, Hospital, at its cost and expense, shall purchase and maintain a
general liability insurance policy which conforms with the coverage amounts and
other requirements described in Section 21.2 above and which names GKF as an
additional insured party. The policy to be maintained by Hospital hereunder
shall be evidenced by a certificate of insurance or other reasonable
documentation which shall be delivered by Hospital to GKF prior to the
commencement of any construction at the Site.

          21.4 During the Term, Hospital shall purchase and maintain all workers
compensation insurance to the maximum extent required by applicable law.

     22. Indemnification.
         ---------------

          22.1 Indemnification by Hospital. Hospital shall indemnify, defend,
               ---------------------------
protect and hold GKF and its members, managers, officers, employees, agents and
contractors (collectively the "GKF Indemnified Parties") harmless from and
against all losses, claims, damages, liabilities, assessments, deficiencies,
actions, proceedings, orders, judgments, liens, costs and other expenses
(including reasonable attorney's fees) of any nature or kind whatsoever
("collectively "Damages") asserted against or incurred by any of the GKF
Indemnified Parties which in any manner arise out of or relate to (a) the
failure by Hospital to fully perform, observe



                                       13
<PAGE>

or satisfy its covenants, duties or obligations contained in this Agreement or
in the LGK Agreement; (b) the use and operation of the Equipment during the
Term; (c) the design, construction and preparation of the Site by Hospital or
the maintenance of the Site during the Term by Hospital; (d) Damages to the
Equipment from the defective, faulty or improper design, construction or
preparation of the Site or the installation and positioning of the Equipment;
(e) Damages to the Equipment (including any Damages arising out of or related to
violations by Hospital, its agents, officers, physicians, employees) caused by
the negligent or wrongful acts or omissions of Hospital, its agents, officers,
physicians, employees or contractors (in the event the Equipment is destroyed or
rendered unusable, the indemnity shall extend up to (but not exceed) the full
replacement value of the Equipment at the time of its destruction less salvage
value, if any); (f) the events or occurrences described in Article 7.3 of the
LGK Agreement to the same extent that Hospital agrees to indemnify Elekta
thereunder.

          22.2 Indemnification by GKF. GKF shall indemnify, defend,
               ----------------------
protect and hold Hospital and its members, managers, officers, employees, agents
and contractors (collectively the "Hospital Indemnified Parties") harmless from
and against all Damages asserted against or incurred by any of the Hospital
Indemnified Parties which in any manner arise out of or relate to the failure by
GKF to fully perform, observe or satisfy its covenants, duties or obligations
contained in this Agreement.

          22.3 Upon the occurrence of an event for which any of the GKF
Indemnified Parties or the Hospital Indemnified Parties (as applicable, an
"indemnified party") are entitled to indemnification under this Agreement, the
applicable indemnified party shall give written notice thereof to Hospital or
GKF (as applicable, the "indemnifying party") setting forth the type and amount
of Damages. If the indemnity relates to a Third Party Claim (as defined in
Section 22.4 below), the matter shall be subject to Section 22.4 below. If the
indemnity relates to any Damages other than a Third Party Claim, not more than
thirty (30) days after the indemnified party's written notice is given, the
applicable indemnifying party either shall acknowledge in writing to the
applicable indemnified party its obligation to indemnify hereunder and pay the
Damages in full to such indemnified party or dispute its obligation to indemnify
in a written notice delivered to such indemnified party. If the indemnifying
party disputes the obligation to indemnify, the parties shall meet and negotiate
in good faith to mutually resolve the disagreement regarding indemnification. If
the parties are unable to resolve the disagreement within forty-five (45) days
after the indemnified party's written notice is given, the indemnified party may
seek its legal and equitable remedies to enforce the indemnified party's
indemnification obligations hereunder.

          22.4 The indemnified party shall give written notice to the
indemnifying party as soon as reasonably possible after it has knowledge of any
third party claim or legal proceedings ("Third Party Claim") for which the
indemnified party is entitled to indemnification under this Section 22. The
indemnifying party shall (a) immediately assume, at its sole cost and expense,
the defense of the Third Party Claim with legal counsel approved by the
indemnified party (which approval will not be unreasonably withheld, delayed or
conditioned), and (b) as



                                       14
<PAGE>

soon as reasonably possible after the indemnified party's written notice is
given to the indemnifying party, acknowledge in writing to the indemnified party
its obligation to indemnify the indemnified party in accordance with the terms
of this Agreement. If the indemnifying party fails to assume the defense of a
Third Party Claim or fails to timely acknowledge in writing its obligation to
indemnify the indemnified party, the indemnified party may assume the defense of
the Third Party Claim in the manner described in Section 22.5 below. The
indemnified party shall cooperate with the indemnifying party in the defense of
any Third Party Claim. Any settlement or compromise of a Third Party Claim to
which the indemnified party is a party shall be subject to the express written
approval of the indemnified party, which approval shall not be unreasonably
withheld, delayed or conditioned as long as an unconditional term of the
settlement or compromise is the full and absolute release of the indemnified
party from all Damages arising out of the Third Party Claim. The indemnified
party, at its own cost and expense, may participate on its own behalf with legal
counsel of its own selection in the defense of any Third Party Claim which may
have a material impact on the indemnified party.

          22.5 If the indemnifying party fails to promptly assume the defense of
any Third Party Claim, the indemnified party may assume the defense of the Third
Party Claim with legal counsel selected by the indemnified party, all at the
indemnifying party's cost and expense. The defense of an action by the
indemnified party under this Section 22.5 shall not impair, limit or otherwise
restrict the indemnifying party's indemnification obligations arising under this
Section 22 or GKF's right to enforce such obligations.

          22.6 The indemnity obligations under this Section 22 shall survive the
termination of this Lease with respect to events occurring during or relating to
the Term.

          22.7 The indemnification obligations set forth in this Agreement are
intended to supplement, and not supersede, supplant or replace, any coverage for
Damages which may be available under any insurance policies that may be
maintained by the indemnified party. In the event any Damages may be covered by
insurance policies, the parties shall exercise good faith and use their best
efforts to obtain the benefits of and apply the available insurance coverage to
the Damages subject to indemnification under this Agreement. In the event that
an insurer provides coverage under an insurance policy on the basis of a
"reservation of rights", the indemnification obligations under this Agreement
shall apply to all Damages which are finally determined as not being covered
under the insurance policy.

     23. Miscellaneous.
         -------------

          23.1 Binding Effect. This Agreement shall be binding upon and inure to
               --------------
the benefit of the parties hereto and their respective successors and assigns.
Hospital shall not assign this Agreement or any of its rights hereunder or
sublease the Equipment without the prior written consent of GKF, which consent
shall not be unreasonably withheld. An assignment or sublease shall not relieve
Hospital of any liability for performance of this Agreement during the remainder



                                       15
<PAGE>

of the Term. Any purported assignment or sublease made without GKF's prior
written consent shall be null, void and of no force or effect.

          23.2 Agreement to Perform Necessary Acts. Each party agrees to perform
               -----------------------------------
any further acts and execute and deliver any further documents which may be
reasonably necessary or otherwise reasonably required to carry out the
provisions of this Agreement.

          23.3 Validity. If for any reason any clause or provision of this
               --------
Agreement, or the application of any such clause or provision in a particular
context or to a particular situation, circumstance or person, should be held
unenforceable, invalid or in violation of law by any court or other tribunal of
competent jurisdiction, then the application of such clause or provision in
contexts or to situations, circumstances or persons other than that in or to
which it is held unenforceable, invalid or in violation of law shall not be
affected thereby, and the remaining clauses and provisions hereof shall
nevertheless remain in full force and effect.

          23.4 Attorney's Fees and Costs. In the event of any action,
               -------------------------
arbitration or other proceedings between or among the parties hereto with
respect to this Agreement, the non-prevailing party or parties to such action,
arbitration or proceedings shall pay to the prevailing party or parties all
costs and expenses, including reasonable attorneys' fees, incurred in the
defense or prosecution thereof by the prevailing party or parties. The party
which is a "prevailing party" shall be determined by the arbitrator(s) or
judge(s) hearing the matter and shall be the party who is entitled to recover
his, her or its costs of suit, whether or not the matter proceeds to a final
judgment, decree or determination. A party not entitled to recover his, her or
its costs of suit shall not recover attorneys' fees. If a prevailing party or
parties shall recover a decision, decree or judgment in any action, arbitration
or proceeding, the costs and expenses awarded to such party may be included in
and as part of such decision, decree or judgment.

          23.5 Entire Agreement; Amendment. This Agreement together with the
               ---------------------------
Exhibits attached hereto constitutes the full and complete agreement and
understanding between the parties hereto concerning the subject matter hereof
and shall supersede any and all prior written and oral agreements with regard to
such subject matter. This Agreement may be modified or amended only by a written
instrument executed by all of the parties hereto.

          23.6 Number and Gender. Words in the singular shall include the
               -----------------
plural, and words in a particular gender shall include either or both additional
genders, when the context in which such words are used indicates that such is
the intent.

          23.7 Effect of Headings. The titles or headings of the various
               ------------------
paragraphs hereof are intended solely for convenience or reference and are not
intended and shall not be deemed to modify, explain or place any construction
upon any of the provisions of this Agreement.




                                       16
<PAGE>

          23.8 Counterparts. This Agreement may be executed in one or more
               ------------
counterparts by the parties hereto. All counterparts shall be
construed together and shall constitute one agreement.

          23.9 Governing Law. This Agreement shall be interpreted and enforced
               -------------
in accordance with the internal laws, and not the law of
conflicts, of the State of California applicable to agreements made and to be
performed in that State.

          23.10 Exhibits. All exhibits attached hereto and referred to in this
                --------
Agreement are hereby incorporated by reference herein as though fully set forth
at length.

          23.11 Ambiguities. The general rule that ambiguities are to be
                -----------
construed against the drafter shall not apply to this Agreement. In the event
that any provision of this Agreement is found to be ambiguous, each party shall
have an opportunity to present evidence as to the actual intent of the parties
with respect to such ambiguous provision.

          23.12 Representations. Each of the parties hereto represents (a) that
                ---------------
no representation or promise not expressly contained in this Agreement has been
made by any other party hereto or by any of its agents, employees,
representatives or attorneys; (b) that this Agreement is not being entered into
on the basis of, or in reliance on, any promise or representation, expressed or
implied, other than such as are set forth expressly in this Agreement; (c) that
it has been represented by counsel of its own choice in this matter or has
affirmatively elected not to be represented by counsel; (d) it is duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization, (e) it has full power and authority to
execute, deliver and perform this Agreement, and (f) the execution, delivery and
performance of this Agreement has been duly authorized by all necessary
corporate or other similar action.

          23.13 Non-Waiver. No failure or delay by a party to insist upon the
                ----------
strict performance of any term, condition, covenant or agreement of this
Agreement, or to exercise any right, power or remedy hereunder or under law or
consequent upon a breach hereof or thereof shall constitute a waiver of any such
term, condition, covenant, agreement, right, power or remedy or of any such
breach or preclude such party from exercising any such right, power or remedy at
any later time or times.

          23.14 Notices. All notices, requests, demands or other communications
                -------
required or permitted to be given under this Agreement shall be in writing and
shall be delivered to the party to whom notice is to be given either (a) by
personal delivery (in which case such notice shall be deemed to have been duly
given on the date of delivery), (b) by next business day air courier service
(e.g., Federal Express or other similar service) (in which case such notice
shall be deemed given on the business day following deposit with the air courier
service), or (c) by United States mail, first class, postage prepaid, registered
or certified, return receipt requested (in which case such notice shall be
deemed given on the third (3rd) day following the date of mailing), and properly
addressed as follows:



                                       17
<PAGE>

              To GKF:               Craig K. Tagawa
                                    Chief Executive Officer
                                    GK Financing, LLC
                                    Two Embarcadero Center, Suite 2370
                                    San Francisco, CA 94111

              To Hospital:          Vincent DiRubbio
                                    Mercy Medical Center
                                    President and CEO
                                    1000 N. Village Ave.
                                    Rockville Centre, N.Y.  11570

A party to this Agreement may change his, her or its address for purposes of
this Section by giving written notice to the other parties in the manner
specified herein.

          23.15 Special Provisions Respecting Medicare and Medicaid Patients
                ------------------------------------------------------------

                23.15.1 Hospital and GKF shall generate such records and make
such disclosures as may be required, from time to time, by the Medicare,
Medicaid and other third party payment programs with respect to this Agreement
in order to meet all requirements for participation and payment associated with
such programs, including but not limited to the matters covered by Section
1861(v)(1)(I) of the Social Security Act.

                23.15.2 For the purpose of compliance with Section 1861(v)(1)(I)
of the Social Security Act, as amended, and any regulations promulgated pursuant
thereto, both parties agree to comply with the following statutory requirements
(a) Until the expiration of four (4) years after the termination of this
Agreement, both parties shall make available, upon written request to the
Secretary of Health and Human Services or, upon request, to the Comptroller
General of the United States, or any of their duly authorized representatives,
the contract, and books, documents and records of such party that are necessary
to certify the nature and extent of such costs, and (b) if either party carries
out any of the duties of the contract through a subcontract with a value or cost
of $10,000 or more over a twelve month period, with a related organization, such
subcontract shall contain a clause to the effect that until the expiration of
four (4) years after the furnishing of such services pursuant to such
subcontract, the related organization shall make available, upon written request
to the Secretary, or upon request to the Comptroller General, or any of their
duly authorized representatives the subcontract, and books, documents and
records of such organization that are necessary to verify the nature and extent
of such costs.

          23.16 Force Majeure. Failure to perform by either party will be
                --------------
excused in the event of any delay or inability to perform its duties under this
Agreement directly or indirectly caused by conditions beyond its reasonable
control, including, without limitation, fires, floods, earthquakes, snow, ice,
disasters, acts of God, accidents, riots, wars, operation of law, strikes,



                                       18
<PAGE>

governmental action or regulations, shortages of labor, fuel, power, materials,
manufacturer delays or transportation problems. Notwithstanding the foregoing,
all parties shall make good faith efforts to perform under this Agreement in the
event of any such circumstance. Further, once such an event is resolved, the
parties shall again perform their respective obligations under this Agreement.

     24.  Notwithstanding any other provision in this contract, the facility
remains responsible for ensuring that any service provided pursuant to this
contract complies with all pertinent provisions of Federal, State and local
statues, rules and regulations.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
as of the date first set forth above.

"GKF"                          GK FINANCING, LLC,
                               a California limited liability company



                                By:  /s/ Craig K. Tagawa
                                     ---------------------
                                     Craig K. Tagawa
                                     Chief Executive Officer

"HOSPITAL"                      MERCY MEDICAL CENTER,
                                a not-for-profit corporation

                                By:  /s/ Vincent DiRubbio
                                     ---------------------
                                     Vincent DiRubbio
                                     President/CEO

Section 8.

The following bold type shall be substituted for the first sentence.

PER PROCEDURE PAYMENTS. AS RENT FOR THE LEASE OF THE EQUIPMENT TO HOSPITAL
-----------------------
PURSUANT TO THIS AGREEMENT AND IN CONSIDERATION FOR GKF'S REIMBURSEMENT OF THE
AMOUNTS SET FORTH IN SECTION 7 ABOVE, HOSPITAL SHALL PAY TO GKF THE SUM OF FOR
"PROCEDURE" * AND * FOR PROCEDURE * AND * FOR ANY AND ALL PROCEDURES GREATER
THAN * PERFORMED BY HOSPITAL OR ITS REPRESENTATIVES OR AFFILIATES, IRRESPECTIVE
OF WHETHER THE PROCEDURE IS PERFORMED ON THE EQUIPMENT OR USING ANY OTHER
EQUIPMENT OR DEVICE (THE "LEASE PAYMENT"). THE CALCULATION FOR THE NUMBER OF
PROCEDURES WILL RUN IN TWELVE (12) MONTH CYCLES STARTING WITH THE FIRST
PROCEDURE DATE. EACH TWELVE (12) MONTH PERIOD FOLLOWING THE FIRST PROCEDURE DATE
WILL BEGIN CALCULATING PROCEDURES FROM ZERO (0).

                                       19