Document:

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                                                                   EXHIBIT 10.17

                                      LEASE

        THIS AGREEMENT, made and entered into on ______________, 2002, by and
between 4396 INDEPENDENCE COURT, INC., a Florida corporation, hereinafter called
Landlord, and Invisa, Inc., a Nevada corporation (fka SmartGate, Inc.),
hereinafter Tenant;

                                  WITNESSETH:

        That for and in consideration of the mutual covenants hereinafter
contained and the sums of money paid and hereinafter agreed to be paid by Tenant
to Landlord and for other valuable considerations, Landlord does hereby demise
and lease unto Tenant and Tenant does hereby hire and let from Landlord
commencing July 1, 2002 the following described property situate in Sarasota
County, Florida:

                        The property located on Lots 19 and 20, Northgate Center
                        Subdivision, Unit Number 4, as per plat thereof recorded
                        in Plat Book 30, Pages 46 and 46A, Public Records of
                        Sarasota County, Florida, together with all improvements
                        thereon which consist of four office spaces (for a total
                        of approximately 2,800 square feet of office) and eight
                        (8) warehouse spaces (for a total of approximately
                        12,000 square feet of warehouse) and upstairs, built-in
                        space in the warehouse of approximately 400 square feet,
                        for a total of approximately 15,200 square feet.

        1.      TERM AND RENT. The term of this Lease shall be for a period
commencing on July 1, 2002 and expiring June 30, 2004. Tenant shall pay to
Landlord base rental, subject to upward adjustments as set forth in paragraph 2,
below, in equal monthly installments of $8,600 each month, plus sales taxes, on
the first day of each month in advance, commencing July 1, 2002. Landlord does
hereby acknowledge receipt of $6,715, plus sales taxes of $470.05, representing
a portion of the last month's rental. Said rental shall be payable at c/o James
L. Turner, Esquire, Williams, Parker, Harrison, Dietz & Getzen, 200 South Orange
Avenue, Sarasota, Florida 34236.

        2.      INCREASED RENTAL. The annual rent due for the period July 1,
2003 through June 30, 2004, shall be an amount equal to the total rent which was
due for the lease year from July 1, 2002 to June 30, 2003 times a fraction, the
numerator of which shall be the level of the Consumer Price Index for retail
commodity prices designated as the Consumer Price Index, All Items and Major
Group Figures for All Urban Consumers (1967=100) (the "Index") published by the
Bureau of Labor Statistics of the United States Department of Labor, published
for the April next preceding the commencement of the July 1 through June 30
lease year for which the annual rent is being calculated, and the denominator of
which shall be the level of the Index for April 2002. However, notwithstanding
any of the above, in no event shall any annual rent be greater than five percent
(5%) more than that for the preceding lease year. In the event the aforesaid
Index ceases to be prepared and published, then the annual rent shall be
adjusted in accordance with the most comparable commodity index then in
existence.

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        The annual rent for each lease year described above shall be paid at
such place as Lessor shall designate, in twelve (12) equal, consecutive monthly
installments, due on the first day of each calendar month within the applicable
lease year.

        3.      SECURITY DEPOSIT. Landlord does hereby acknowledge that Tenant
has delivered to Landlord a security deposit in the amount of $6,715 (the
"Security Deposit"). The Security Deposit shall be Landlord's as security for
the faithful performance by Tenant of Tenant's covenants and obligations under
this Lease, it being expressly understood that such Security Deposit shall not
be considered an advance payment of rent or a measure of Landlord's damage in
case of a default by Tenant. The Security Deposit may be commingled with
Landlord's funds without accounting thereof to Tenant. Upon the occurrence of
any event of default by Tenant, Landlord may, from time to time, without
prejudice to any other remedy, use such Security Deposit to the extent necessary
to make good any arrearage of rent or other changes unpaid by Tenant and any
other damages, injury, expense, or liability caused to Landlord by such event of
default. Following any such application of the Security Deposit, Tenant shall
promptly pay to Landlord on demand the amount so applied in order to restore the
Security Deposit to its original amount. If Tenant is not then in default
hereunder, any remaining balance of such Security Deposit shall be returned by
Landlord to Tenant upon termination of this Lease.

                Upon sale or conveyance of the building, Landlord shall pay over
the balance of such deposits and any advanced rent in its possession to the
purchaser and Landlord shall thereupon be relieved from all liability with
respect to same and Tenant shall look solely to the purchaser with respect
thereto. Tenant agrees that from time to time upon no less then ten (10) days'
prior request by Landlord, Tenant will deliver a statement in writing certifying
all of the following:

                (a)     That the Lease is unmodified and in full force and
effect (or, if there have been modifications, that the Lease as modified is in
full force and effect and stating the modifications);

                (b)     The dates to which the rent and other charged have been
paid;

                (c)     The annual rental rate then in effect;

                (d)     The Lease term;

                (e)     That all conditions to Tenant's possession of the
Premises and commencement of the Lease term have been satisfied, if true; and

                (f)     That Landlord is not in default under any provisions
of this Lease, if true;

                (g)     Any other information reasonably requested by Landlord.

                It is intended that any such statement delivered pursuant to
this paragraph may be relied upon by any prospective purchaser or mortgagee
of the property.

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        4.      QUIET ENJOYMENT. Provided Tenant shall pay all rents as herein
agreed and keep and perform all of the terms, covenants and conditions hereof,
Tenant shall peaceably possess and quietly enjoy the demised premises without
hindrance or interruption subject only to the terms hereof, reservations,
restrictions and easements of record and applicable zoning and other
governmental regulations.

        5.      USE OF PREMISES. Tenant shall use the demised premises solely
for the purpose of all actions, processes, and services associated with
development, production manufacturing, and sales of the Tenant's or sub-tenant's
products, services, and property, and related uses, and no other use shall be
made thereof without the prior express written consent of Landlord. Tenant shall
make no immoral, offensive or illegal use of the demised premises or do anything
thereon deemed extra hazardous or which would cause insurance rates to increase.
Tenant shall abide by all reasonable directions and requirements of any
insurance company insuring the premises and shall keep and abide by all laws,
ordinances, rules and regulations of all governmental bodies and their
respective regulatory agencies having any jurisdiction over the demised
premises. Tenant shall not commit or suffer any strip or waste in or about the
demised premises.

        6.      UTILITIES. Tenant shall be billed directly for and shall pay all
charges made for electricity to the building and to the common areas (common
hallway, bathrooms, and parking lights), and water and sewer for the property,
including building and common areas, including connection charges and deposits,
if required. Tenant shall be responsible for garbage and trash collection for
the demised premises, including paying for a dumpster to be located on the
southeast corner of the building. Tenant shall be billed directly for and shall
pay all charges associated with the fire alarm monitoring system. Tenant shall
pay for all other utilities used or furnished to the demised premises at the
request of Tenant during the term hereof.

        7.      TENANT'S MAINTENANCE. Tenant shall maintain the interior of the
demised premises, including interior ceilings, walls, floors, plumbing and
plumbing fixtures, electrical service and fixtures, other fixtures, heating and
air conditioning equipment, pipes, doors, windows and all glass, the overhead
doors, including the common hallway and the two bathrooms in the common hallway,
in a safe, clean, sightly and sanitary condition, and in good working order, and
shall repair and replace same as is necessary to maintain them in the condition
they were in at the time Tenant took occupancy of the demised premises and, in
any event, to maintain them in good working order. Tenant shall be responsible
to enter into a servicing agreement for the heating and air conditioning
equipment, at Tenant's expense satisfaction to Landlord. Landlord shall in no
event be responsible for replacement of any broken windows, regardless of the
cause thereof, the responsibility for which being that of Tenant. Tenant shall
make no alterations or structural changes to the improvements on the demised
premises or place signs on the exterior thereof without the prior written
consent of Landlord, which shall not be unreasonably withheld. Tenant shall also
be billed directly for and pay the maintenance fees charged by the Northgate
Center Association and covering the term of this Lease, as it may be renewed.
Upon the commencement of this Lease and the termination of this Lease, if it
does not coincide with the Association's billing cycle, Tenant shall pay to
Landlord his pro rata amount of the Association fees until the beginning of the
next billing cycle, if at the beginning of the Lease term, and from the end of
the last billing cycle to the date of termination, upon termination of the
Lease.

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        8.      LANDLORD'S MAINTENANCE. Landlord shall maintain the exterior
walls, roof and foundation of the demised premises in good and substantial
repair. Landlord shall maintain all landscaping located on the demised premises
in a clean and sightly condition, and in good and substantial repair, ordinary
wear and tear excepted. Landlord shall also maintain all pavement, parking
areas, and driveways of the subject building all in a clean and sightly
condition and in good and substantial repair, which is the same condition as
they were in at the inception of the term hereof, ordinary wear and tear
excepted.

        9.      CONTROL OF EXTERIOR APPEARANCE; SIGNS. The exclusive right is
reserved by Landlord to control the exterior appearance of the entire premises,
including but not limited to all signs, decorations, lettering and advertising
visible from the exterior of the building (including those on the interior or on
windows or doors), shades, awnings, window coverings, exterior or interior
lights, antenna, canopies, or anything whatsoever affecting the visual
appearance of the building. Tenant will not place or cause to be placed or
maintained any item of any kind on or in any of the Premises affecting the
exterior appearance of the building or common areas without first obtaining
Landlord's written approval and consent, which shall not be unreasonably
withheld. Tenant further agrees to maintain any items as may be approved for
Tenant's placement on the building or common areas in good condition and repair
at all times. Tenant shall have the right to erect and maintain a sign on the
front wall of the building forming a part of the demised premises provided it is
in harmony with the decor of the balance of Landlord's building and provided
Landlord has given its written consent to same, which consent shall not be
unreasonably withheld. Tenant or its agent or employees shall be responsible for
obtaining all required sign permits.

        10.     LIABILITY INSURANCE AND INDEMNIFICATION. Landlord shall not be
liable to Tenant or any other person for any damage to property or injury to
persons upon the demised premises from any cause whatever, including, but not
limited to, act of God, fire, water, defects in the demised premises or
otherwise, except for such damage or injury as is caused by a breach of
Landlord's agreement in paragraph 8, above, to maintain portions of the
premises. "Demised premises" shall mean the entire property leased by Tenant,
including all improvements thereon and the common areas. Tenant shall indemnify
and hold harmless Landlord from and against any and all liabilities, claims,
demands, damages, expenses, fees, fines, penalties, suits, proceedings, actions
and causes of action of any and every kind and nature (collectively "Claims")
arising or growing out of or in any way connected with Tenant's use, occupancy,
management or control of the demised premises or any portion thereof, provided
such Claims do not result from a breach of Landlord's agreement in paragraph 8,
above, to maintain portions of the premises, or arising out of or in any way
connected with any act or omission of the Tenant, any of Tenant's subtenants,
licensees, agents or representatives and their respective successors and assigns
or anyone claiming by, through, under or against Tenant, or resulting from any
breach, violation or nonperformance of any covenant, condition or agreement
herein contained on the part of the Tenant to be kept and performed resulting in
loss of life or injury to any person or persons or damage to any property.
Tenant shall defend any and all actions, suits or proceedings which may be
brought against Landlord, or in which the Landlord may be impleaded or joined
with others and shall satisfy, pay and discharge any and all judgments, orders
and decrees that may be recovered against Tenant or Landlord in any such action
or proceedings, unless such action, suit or proceeding relates exclusively to a
breach of Landlord's agreement in paragraph 8, above, to maintain portions of
the premises. In addition to the

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foregoing, Tenant shall carry and pay for general liability insurance fully
protecting and insuring Landlord and Tenant from and against any liability,
claim, loss, damage or expense arising out of any of the foregoing with limits
in an amount not less than $1,000,000 for injury to or death of any one person,
$2,000,000 for injury to or death of any number of people arising out of any one
occurrence and $250,000 for damage to property. Said liability insurance shall
be carried in a solvent reputable insurance company authorized to do business in
the State of Florida and approved by Landlord. Tenant shall furnish a
certificate showing said insurance to be in full force and effect upon request
of Landlord.

        11.     TAXES. Landlord shall pay all ad valorem and real estate taxes
and assessments, regular or special, levied against the premises. Tenant will
pay any sales tax on the aforesaid rental payments and will also pay all taxes
and assessments now or hereafter levied against personal property owned by
Tenant and located within or upon the demised premises.

        12.     FIRE AND CASUALTY INSURANCE. Landlord shall keep the
improvements situate on the demised premises insured against loss or damage by
fire and extended coverage insurance. Landlord shall pay the premium for such
insurance.

        13.     DESTRUCTION OF PREMISES. In the event of the total destruction
of the improvements on the demised premises or such substantial partial
destruction thereof as will cause the entire demised premises to be unfit for
the aforesaid use by fire or otherwise, this Lease shall be terminated and the
rights of all parties hereunder shall cease except such rights and liabilities
as may have accrued to the time of such destruction. In the event of partial
destruction of the building located on the demised premises by fire or
otherwise, said partial destruction not rendering the same unfit for the use
aforesaid, the rent shall abate for that portion of the premises rendered
untenantable. Such abatement in the rent shall continue only for such period of
time as the premises or a portion thereof is rendered untenantable. In the event
of such partial destruction, Landlord shall restore the same within a reasonable
period of time.

        14.     WAIVER OF DEFAULT. No waiver of any breach of any of the terms,
covenants and conditions hereof shall be taken or construed to be the waiver of
any other or succeeding breach of the same or any other term, covenant or
condition hereof

        15.     CORRECTIONS OF DEFAULTS. If Tenant defaults in any of the terms,
covenants and conditions hereof, Landlord may perform the same or procure the
performance thereof without waiving or affecting the option to terminate the
term hereof or waiving said default or waiving any rights hereunder, and all
payment or payments or expenditures (including reasonable attorney's fees as
hereinafter provided) made by Landlord in so doing shall be charged to Tenant,
shall become immediately due and payable and shall bear interest at the rate of
eighteen percent (18%) per annum from the date of disbursement by Landlord until
paid by Tenant.

        16.     IDENTITY OF INTEREST. The execution of this Lease or the
performance of any of the terms hereof shall not be deemed or construed to have
the effect of creating, between Landlord and Tenant, the relationship of
principal and agent or of a partnership or of a joint venture and the
relationship between the parties hereto shall always be and remain that of
Landlord and Tenant.

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        17.     DEFAULT. In the event Tenant shall be in default in the payment
of rent for more than ten (10) days (after notice of such default in writing,
via certified mail) or if Tenant shall continue in default in the observance or
performance of any of the terms, covenants and conditions hereof after fifteen
(15) days' notice of such default in writing (via certified mail), Tenant shall
become a tenant at sufferance, thereby waiving all right of notice, and it shall
be lawful for Landlord, or Landlord's duly authorized agents, to re-enter and
take possession of the demised premises without legal process and to dispossess
and remove all persons, their goods and chattels, without liability in law or in
equity for any damages caused by such removal, dispossession and re-entry and
Tenant hereby waives any and all claims for damages therefor and hereby
discharges the Landlord therefrom. Said re-entry and repossession shall be a
cumulative remedy and shall not deprive Landlord of any other legal rights which
Landlord might have as a matter of law. Tenant agrees to pay, in the event of a
default under the terms hereof, all costs, expenses and reasonable attorneys'
fees incurred in the collection of any rents due hereunder or in the enforcement
by Landlord of any of the terms and conditions hereof, or in regaining the
premises, including those costs, expenses and reasonable attorneys' fees
incurred in appellate proceedings. Should Tenant fail to pay within five (5)
days of when any installment of rent or any other sum payable to Landlord under
the terms of this Lease is due, then Landlord may assess a late fee of five
percent (5%) of said sum and such fee shall be paid by Tenant to Landlord upon
demand.

        18.     ADDITIONAL EVENTS OF DEFAULT. If Tenant shall make any
assignment for the benefit of creditors, file a petition in bankruptcy or be
adjudged bankrupt after filing of an involuntary petition, take or receive the
advantage or benefit of any insolvency or bankruptcy act, enter into an
agreement of composition with creditors, or if a receiver shall be appointed to
take control of the business of Tenant, same shall constitute a default
hereunder and Landlord may, at Landlord's option, by giving ten (10) days
written notice of such election, terminate this Lease as in the event of a
violation by the Tenant of any of the terms, covenants and conditions hereof.

        19.     ACCESS TO PREMISES BY LANDLORD. The Landlord or any of
Landlord's agents shall have free access to the demised premises and all parts
thereof during normal business hours with at least twenty-four (24) hours'
advance notice (which may be telephone, facsimile, or in writing) for the
purpose of examining same and to make such repairs as Landlord deems advisable.

        20.     NOTICES. Any notice or other communications required or
permitted hereunder shall be in writing and shall be sufficiently given if
delivered personally or sent by registered or certified mail, postage prepaid,
addressed as follows or to such other address of which the parties may have
given notice:

         If to Landlord:          James L. Turner, Esq.
                                  Williams, Parker, Harrison, Dietz & Getzen
                                  200 South Orange Avenue
                                  Sarasota, Florida 34236

         If to Tenant:            Stephen A. Michael, President

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                                  Invisa, Inc.
                                  4400 Independence Court
                                  Sarasota, Florida 34234

        21.     CONDEMNATION. In the event a part of the demised premises be
taken by reason of the exercise of the right of eminent domain or be conveyed in
settlement of threatened eminent domain proceedings (both of which are
hereinafter referred to as a "taking"), there shall be an equitable abatement of
the rental herein provided. Said equitable abatement shall be computed based
upon the said rental as same is compared to the market value of the premises for
the use then being made of same immediately before and immediately after said
taking. If all of the demised premises be taken or if so much of the demised
premises be taken that the value of the improvements on the portion not taken is
substantially impaired, then this Lease and the terms hereof shall cease and
expire upon thirty (30) days written notice given by Tenant to Landlord, said
notice being given within thirty (30) days of the date of delivery of possession
of the demised premises or portion thereof so taken, to the condemning
authority. Upon such termination, all rents and other charges shall be prorated
as of the date of termination. Landlord shall receive all sums as a result of
such taking except those sums attributable to business damages, if any, which
sums shall be received by Tenant.

        22.     SUBORDINATION. Tenant agrees that this Lease shall be subject
and subordinate to any mortgage now a lien upon the aforesaid premises or any
future mortgage executed by Landlord intended to become a mortgage lien against
the demised premises. Tenant further agrees that upon the request of Landlord,
he will promptly execute such documents as may be requested in order to
subordinate this Lease to the lien of any present or future mortgage,
irrespective of the time of execution or time of recording of any such mortgage
or mortgages, provided that the holder of any such mortgage shall enter into an
agreement with Tenant, in recordable form, that in the event of foreclosure or
other right asserted under the mortgage by the holder or any assignee thereof,
this Lease and the rights of Tenant hereunder shall continue in full force and
effect and shall not be terminated or disturbed except in accordance with the
provisions of this Lease. Tenant agrees that if requested by the holder of any
such mortgage he will be a party to said agreement and will agree in substance
that if the mortgagee or any assignee of said mortgage shall succeed to the
interest of Landlord in this Lease, he will recognize said mortgagee or assignee
as his Landlord under the terms of this Lease. Tenant agrees that he will, upon
request of Landlord, execute, acknowledge and deliver any and all instruments
necessary or desirable to give effect to or notice of such subordination. The
word "mortgage" as used herein includes mortgages, deeds of trust, or other
similar instruments and any modification, consolidation, extension, renewal,
replacement or substitution thereof.

        23.     PARKING. Tenant shall not obstruct, or permit to be obstructed,
the driveway furnishing access to the demised premises. Parking on the premises
shall be only of a temporary nature.

        24.     REMOVAL OF IMPROVEMENTS BY TENANT. Upon the termination of this
Lease, provided that Tenant is not then in default under the terms hereof,
Tenant may remove any and all manufacturing equipment, furniture and furnishings
which may have been furnished and installed by Tenant, provided that Tenant at
his expense repairs any damage resulting from such removal so as to restore the
damaged portion of the premises to the condition existing prior

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to the installation and removal thereof. All other improvements made to the
demised premises by the Tenant and all fixtures of whatsoever kind and nature as
shall be fastened to the premises by the Tenant, not hereinabove specifically
enumerated, shall be deemed to become a part of the premises herein described
upon the termination of this Lease and shall not be removed by the Tenant.
Tenant further agrees that upon the termination of this Lease or any extension
hereof, either by the expiration of its term or otherwise, Tenant will quit the
possession thereof and leave the premises in good, usable condition, equal at
least to the same condition as existing at the commencement of the term of this
Lease, reasonable wear and tear excepted.

        25.     OPTION TO RENEW. Provided that Tenant is not in default or
violation of any of the terms of this Lease, Landlord grants to Tenant an option
to renew this Lease for an additional term of two (2) years, subject to the same
terms and conditions except for this option to renew and except for rental which
shall be as follows: The annual rent due for each July 1 through June 30 period
after June 30, 2004 shall be an amount equal to the total rent which was due for
the lease year from July 1, 2003 through June 30, 2004 times a fraction, the
numerator of which shall be the level of the Consumer Price Index for retail
commodity prices designated as the Consumer Price Index, All Items and Major
Group Figures for All Urban Consumers (1967 = 100) (the "Index") published by
the Bureau of Labor Statistics of the United States Department of Labor,
published for the April next preceding the commencement of the July 1 through
June 30 lease year for which the annual rent is being calculated, and the
denominator of which shall be the level of the Index for April 2004. However,
notwithstanding any of the above, in no event shall the monthly rent payments
during the July 1, 2005 through June 30, 2006 lease year be less than $9,816 per
month. In the event the aforesaid Index ceases to be prepared and published,
then the annual rent shall be adjusted in accordance with the most comparable
commodity index then in existence. Tenant shall give notice in writing of its
election to exercise this option, such notice to be given no later than January
1, 2004. Upon Tenant's failure to exercise said option, Landlord shall have the
right to post "for rent" signs on or about the demised premises.

        26.     ASSIGNMENT AND SUBLETTING. No provisions of this Lease may be
assigned in whole or in part; provided, however, the demised premises may be
sublet upon notice to Landlord, but without the prior written consent of
Landlord.

        27.     PARAGRAPH TITLES. Paragraph titles used herein are solely for
convenience and are not to be used in interpreting particular provisions hereof.

        28.     MISCELLANEOUS PROVISIONS AND DEFINITIONS. All of the terms and
provisions hereof shall be binding upon and the benefits inure to the parties
hereto and their respective heirs, devisees, personal representatives,
successors and assigns. The term "Tenant" and "Landlord" shall include all
parties so designated herein, their respective heirs, devisees, personal
representatives, successors and assigns. Whenever used herein, the singular
number shall include the plural, the plural the singular and the use of any
gender shall include all genders. This Lease and all instruments or documents
relating to same and all references herein shall be construed under Florida law.
The venue of any action or suit brought in connection herewith shall be in the
County wherein the demised premises are situate. Time is of the essence hereof.
This agreement may be executed in several counterparts, each of which shall be
fully effective as an original, and all of which together shall constitute one
and the same instrument.

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A facsimile copy of this agreement and counterpart signature shall be considered
for all purposes, as an original.

        29.     REQUIRED DISCLOSURE. Florida law requires the following
notification to be included in this agreement:

                        Radon is a naturally occurring radioactive gas that,
                        when it is accumulated in a building in sufficient
                        quantities, may represent health risks to persons who
                        are exposed to it over time. Levels of radon that exceed
                        federal and state guidelines have been found in
                        buildings in Florida. Additional information regarding
                        radon and radon testing may be obtained from your county
                        public health unit.

        30.     OPTION TO PURCHASE. For and in consideration of the sum of Ten
Dollars ($10.00) paid by Tenant to Landlord upon the execution hereof as option
money, Landlord does hereby grant to Tenant an option to buy upon the
hereinafter contained terms and conditions, as long as Tenant is not in default
hereunder, and for the period set forth in paragraph A, below, Landlord's land
and improvements located on Lots 19 and 20, Northgate Center Subdivision, Unit
4, Sarasota County, Florida.

                (a)     Exercise of Option. This option shall be exercised, if
at all, by notice in writing to Landlord, c/o James L. Turner, Esquire, 200
South Orange Avenue, Sarasota, Florida 34236, mailed certified mail, return
receipt requested and postmarked, or delivered personally to Landlord before
12:00 Midnight March 31, 2004. If not exercised within said time, and in the
manner required hereby, then this option shall thereupon terminate, be of no
further force or effect and the option money shall be retained by Landlord. In
the event this option is properly exercised, then Landlord agrees to sell and
Tenant agrees to buy upon the hereinafter contained terms and conditions the
aforedescribed property.

                (b)     Price. The purchase price of the property is $836,000.

                (c)     Terms. The total purchase price shall be payable as
follows:

                        i.      $10,000 by cashier's check which must accompany
the aforesaid exercise of the option for said exercise to be valid and
effectual.

                        ii.     Balance in cash at closing, subject to
prorations hereinafter set forth.

                (d)     Closing. If there are no defects in title, closing shall
be held sixty (60) days after exercise of option at 10:00 a.m. at the offices of
Williams, Parker, Harrison, Dietz & Getzen, 200 South Orange Avenue, Sarasota,
Florida. At closing, upon receipt of the aforesaid sums, Landlord shall execute
and deliver to Tenant a sufficient and recordable Warranty Deed conveying a good
marketable record fee simple title in and to the above-described property
subject only to zoning regulations, taxes for the current year, and the terms of
existing leases. Landlord shall pay for required documentary stamps and surtax
on said Deed. Possession shall be given to Tenant on the date of closing. Risk
of loss shall remain with Landlord until closing. Taxes shall be prorated as of
the date of closing.

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                (e)     Defaults. If Landlord fails to perform any of the
covenants hereof, Tenant may, at Tenant's option, elect to have specific
performance. If Tenant fails to perform, Landlord may keep the $10,000 which
accompanies the exercise of the option, as well as keep the option money, as
liquidated damages.

                (f)     Survey. Tenant, at Tenant's expense, may obtain a survey
of said property. If such survey shows any violation of restrictions or
governmental zoning regulations, or if any improvements, other than plantings,
driveways or walkways, are constructed over any easements, of if the
improvements are not entirely within the above-described property, of if there
are any encroachments or overlaps, the same shall be deemed a defect in title.

                (g)     Title Insurance. Within ten (10) days from exercise of
option, Landlord shall, at Tenant's expense, deliver to Tenant or Tenant's
attorney a title insurance binder written on Attorney's Tittle Insurance Fund
agreeing to issue to Tenant, upon recording of the deed and other documents
required hereunder, an owner's title insurance policy in the full amount of the
purchase price. Said policy shall insure Tenant's title to the real estate
herein described without exception or qualification other than the standard
exceptions of such title insurance company and those matters set forth herein.
Tenant shall have ten (10) days from receipt of said binder to examine said
binder and shall notify Landlord within said time of any defect in title or
exceptions in said binder not herein agreed to by Tenant. Upon receipt of such
notice, Landlord shall have a reasonable period of time, not to exceed ninety
(90) days, to remove or correct same and shall use diligence in removing or
correcting same, including the bringing of lawsuits, and this sale shall be
closed within ten (10) days after receipt by Tenant of a title insurance binder
omitting the exceptions to which Buyer has objected. If Landlord does not or
cannot correct such matters after a good faith diligent effort to do so, Tenant
may, at Tenant's option, elect to take title as is or terminate this Agreement
at no expense to Tenant.

                (h)     Lease Termination. If the option is timely exercised,
upon closing of the purchase, the remainder of the Lease is terminated.

        IN WITNESS WHEREOF the parties have hereunto set their hands and seals
the day and year first above written.

Signed, sealed and delivered
in the presence of:                      4396 INDEPENDENCE COURT, INC.,
                                         a Florida corporation

/s/ KATE FOX POTT                        By: /s/ JAMES L. TURNER
-------------------------                   ----------------------------
    Kate Fox Pott                             James L. Turner, President
                                              "Landlord"
/s/ ALICE RICHMAN
-------------------------                Invisa, Inc.,
    Alice Richman                        a Nevada corporation

/s/ NICKIE LONGRIDGE                     By: /s/ STEPHEN A. MICHAEL, PRESIDENT
-------------------------                   ----------------------------------
    Nickie Longridge                     Name: Stephen A. Michael
                                         Its: President
/s/ WILLIAM DOLAN
-------------------------
    William Dolan

                                       10<PAGE>
                                                                   EXHIBIT 10.18

                    QUARTERLY REVENUE BASED PAYMENT AGREEMENT

        This Quarterly Revenue Based Payment Agreement (this "Agreement") is
made and entered into as of February 25, 2002, by and among SmartGate Inc., a
Nevada corporation ("SmartGate") and the persons and entities set forth on
Exhibit "A" or their assigns (individually a "Recipient" and collectively, the
"Recipients").

                                    RECITALS:

        WHEREAS, pursuant to an Agreement of Merger and Plan of Reorganization
by and among SmartGate, SmartGate/RadioMetrix Acquisition Corp. and RadioMetrix
Inc. ("RadioMetrix") which was entered into as of February 25, 2002 ("Merger
Agreement") and closed on even date herewith ("Closing"), the Recipients are
entitled to a certain quarterly revenue based payment; and

        WHEREAS, the parties hereto, by this Agreement, wish to memorialize and
set forth the terms, conditions and details of the quarterly revenue based
payment arrangement;

        NOW, THEREFORE, in consideration of the foregoing and the covenants,
promises and representations set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which is acknowledged, the parties
intending to be legally bound, agree as follows:

        1.      CERTAIN DEFINITIONS. As used in this Agreement, the following
terms shall have the following respective meanings:

                "Change of Control" shall mean that SmartGate has: entered into
a merger transaction in which SmartGate is not the survivor; or sold shares
representing sixty (60%) percent or more of the then outstanding shares in a
transaction; or sold all or substantially all (i.e. - seventy [70%] percent or
more of the fair market value) of the RadioMetrix Technology related assets; or
sold or granted a master license to the RadioMetrix Technology to a third party
in which the stockholders are different than the stockholders of SmartGate.

                "RadioMetrix Technology" shall mean all applications or uses
(save and except only those covered by the Sublicense Agreement between
RadioMetrix and SmartGate, L.C. dated February 14, 1997, as amended by Amendment
dated March 2, 1999 which is incorporated by reference) based upon or covered by
the License Agreement between RadioMetrix and SDR Metro Inc. dated March 14,
1992 as amended by Amendment dated May 26, 1998 which is incorporated by
reference. The present or future validity or enforceability of the Sublicense
Agreement or the License Agreement shall not affect their use for the
definitional purpose as set forth herein.

                "Revenue Based Payment" shall mean a quarterly revenue-based
payment equal to seven (7%) percent of all Revenue from the RadioMetrix
Technology.

                "Revenue from the RadioMetrix Technology" shall mean all revenue
of any description, including but not limited to, revenue from product sales,
licenses, sublicenses, royalties, leases, asset sales, joint ventures or other
consideration, payments, income or revenue derived from or related to the
RadioMetrix Technology.

                "Super Majority" shall mean the holders of seventy-five percent
(75%) of the Recipients' entitlement to the Revenue Based Payment or Termination
Payment, which shall

<PAGE>

                                                                               2

include any of the Recipients' respective heirs, successors or assigns who
acquire all or any part of the entitlement of a Recipient.

                "Termination Payment" shall mean a one-time payment in an
amount equal to the full commercial value of the Revenue Based Payments
determined pursuant to Paragraph 4 of this Agreement which, once paid in full,
has the result of terminating SmartGate's ongoing obligation to pay Revenue
Based Payments under this Agreement.

        2.      REVENUE BASED PAYMENT.

                a.      Until terminated by a Termination Payment pursuant to
this Agreement, SmartGate shall pay to the Recipients the Revenue Based Payment
as defined herein.

                b.      Each Revenue Based Payment shall be paid within fifteen
(15) calendar days following each fiscal quarter of SmartGate.

                c.      Unless otherwise agreed by SmartGate and the Super
Majority, each Revenue Based Payment shall be paid one-half (1/2) in cash and
one-half (1/2) in SmartGate common stock. The SmartGate common stock shall be
valued at seventy-five (75%) percent of the average closing market price for the
thirty (30) calendar days immediately preceding the end of the applicable
quarterly period.

                d.      In the event any Revenue Based Payment is not paid when
due, such unpaid Revenue Based Payment(s) shall accrue interest at the lower of
eighteen (18%) percent or the amount permissible under law per annum from the
due date until the date said Revenue Based Payment (or Revenue Based Payments)
is paid in full.

                e.      Annually, the Quarterly Revenue Based Payments made
shall be reviewed by SmartGate's independent public accountants, which shall
provide the manner of calculation and the amount of payment due for the year.
The Recipients shall have the right to independently audit said calculation. If
any payment is underpaid by greater than ten percent (10%) of the amount that
should have been paid, SmartGate shall immediately pay the unpaid amount with
interest on such unpaid amount at the lower of eighteen percent (18%) or the
amount permissible under law per annum from the date the unpaid amount should
have been paid until it is paid in full.

                f.      The Revenue Based Payment shall be made to the
Recipients (or their respective heirs, successors or assigns) in the following
amounts:

<TABLE>
<CAPTION>
   ----------------------------------------------------------------------------
   NAME                                            % OF THE REVENUE BASED
                                                     PAYMENT BEING PAID
   ----------------------------------------------------------------------------
<S>                                                      <C>
   Stephen A. Michael                                      42.535953
   ----------------------------------------------------------------------------
   Elizabeth Rosemary Duffey Irrevocable Trust             21.267976
   Under Agreement Dated the 29th day of July
   1998
   ----------------------------------------------------------------------------
   Spencer Charles Duffey Irrevocable Trust                21.267976
   Under Agreement Dated the 29th day of
   July 1998
   ----------------------------------------------------------------------------
   Robert T. Roth                                          10.066844
   ----------------------------------------------------------------------------
   William W. Dolan                                         4.861251
   ----------------------------------------------------------------------------
</TABLE>

<PAGE>

                                                                               3

        g.      Any assignment by a Recipient of part or all of their interest
in the Revenue Based Payment shall be effective upon delivery of said assignment
in written form acceptable to SmartGate.

        3.      TERM AND TERMINATION PAYMENT.

                a.      This Agreement and SmartGate's obligation to make
Revenue Based Payments shall continue until terminated by mutual agreement of
the parties or until terminated pursuant to Paragraphs 3(b) and 3(c) hereof.

                b.      SmartGate may terminate its obligation to make future
Revenue Based Payments by making a one-time payment to the Recipients (or their
respective heirs, successors or assigns in interest) of the Termination Payment
as determined pursuant Paragraph 4.

                c.      Should SmartGate enter into a transaction involving a
Change of Control of SmartGate, SmartGate shall, prior to the closing of such
transaction, notify the Recipients in writing of the anticipated Change of
Control transaction. The Super Majority of the Recipients shall, within twenty
(20) calendar days after the receipt of such notice, elect, in the exercise of
their sole discretion, to: (i) require SmartGate to terminate its obligation
pursuant to Paragraph 3(b) by making the Termination Payment thereby terminating
SmartGate's ongoing obligation under this Agreement to make Revenue Based
Payments. In the event of such election, the Termination Payment shall be made
in full before the closing of the Change of Control transaction, unless
otherwise agreed in writing by the Super Majority of the Recipients; or (ii)
require that this Agreement and SmartGate's ongoing obligation to make Revenue
Based Payments shall continue as an express obligation of the surviving entity
or the entity which gains control over SmartGate or its assets.

                d.      The Termination Payment shall be paid to the Recipients
(or their respective heirs, successors or assigns) in the same percentage
amounts as the Revenue Based Payments are paid.

                e.      Unless otherwise agreed by SmartGate and the Super
Majority, the Termination Payment shall be paid one-half (1/2) in cash and
one-half (1/2) in SmartGate common stock. The SmartGate common stock shall be
valued at seventy-five (75%) percent of the average closing market price for the
thirty (30) calendar days immediately preceding the date of the Termination
Payment.

        4.      DETERMINATION OF THE AMOUNT OF THE TERMINATION PAYMENT.

                a.      The amount of the Termination Payment shall be
determined by appraisal.

                b.      Unless otherwise agreed in writing by SmartGate and the
Super Majority of the Recipients, the appraisal shall reflect the full
commercial value of the entitlement to receive Revenue Based Payments for the
duration of this Agreement. The determination of full commercial value shall not
be adjusted for current or past relationships between the parties, past Revenue
Based Payments, other consideration paid under the Merger Agreement or equity
interests of the Recipients in SmartGate. The appraisal shall take into
consideration the future prospects of the RadioMetrix Technology, the present as
well as future product applications and the potential of future revenue assuming
reasonable financial support for product development, product introduction,
marketing and sales support. Further, the appraisal shall take into
consideration the potential of future Revenue Based Payments over the full term
of the entitlement (including, but not limited to, potential product sales,
license, royalty, joint venture

<PAGE>

                                                                               4

and other revenue) from products or technology applications which are then
commercialized and future or potential applications.

                c.      The appraisal shall be performed by an appraisor
mutually acceptable to SmartGate and the Super Majority. In the event SmartGate
and the Super Majority cannot agree upon who the appraisor shall be, then
SmartGate shall select an appraisor and the Super Majority shall select an
appraisor, and those two appraisors shall select a third appraisor and that
third appraisor shall be the appraisor to determine the amount of the
Termination Payment based upon the criteria set forth in Paragraph 4(b) above.

        5.      RECIPIENTS REMEDIES. SmartGate's obligation to make the Revenue
Based Payments constitutes a material element of this Agreement. SmartGate
acknowledges that, in the absence of a breach by Radio Metrix, SmartGate shall
not fail or refuse to make any Revenue Based Payments when due or otherwise
challenge its obligation to make the Revenue Based Payments. Such failure,
refusal or challenge by SmartGate would be wholly inconsistent with the
intentions of the parties entering into this Agreement and could be grounds for
bad faith. Any failure by SmartGate to timely make the Revenue Based Payments
when due or any challenge to the legality or enforceability of the provisions
of this Agreement shall be deemed to be a material breach of this Agreement
entitling the Recipients to seek damages and specific performance under the
arbitration provision of this Agreement.

        6.      ACKNOWLEDGMENT OF PRESENT AND FUTURE CONFLICTS OF INTEREST.

                a.      SmartGate has been fully advised of the conflicts of
interest of the Recipients and Duffey & Dolan, P.A. (collectively, the
"Conflicted Parties"). SmartGate has had full access to all books, records and
other documents of RadioMetrix and to ask questions of RadioMetrix, officers and
directors. SmartGate appointed an Independent Committee of its Board of
Directors (the "Independent Committee of Directors"), and has vested said
Independent Committee of Directors with full and complete authority to
negotiate, perform due diligence and, in its sole discretion, to enter into and
close this Agreement and the Merger Agreement. The conflicts of interest of the
Conflicted Parties were expressly waived by the Independent Committee of
Directors. Further, the Independent Committee of Directors hereby waives: (i)
any defense to the future enforceability or validity of this Agreement arising
out of or relating to the conflicts of interest of the Conflicted Parties; and
(ii) any claim or cause of action which may be brought by SmartGate against the
Conflicted Parties based upon or related to the conflicts of interest.

                b.      Following the Effective Time of the Merger Agreement,
SmartGate shall conduct its business, including all aspects relating to the
commercialization, development, product introduction, product marketing and the
establishment of product and licensing pricing of the RadioMetrix Technology in
a fashion deemed by the Board of Directors to be in the best interest of
SmartGate and its stockholders without regard to the interests of the Recipients
or with regard to the Merger Consideration and Additional Merger Consideration
issued under the Merger Agreement. The Recipients hereby acknowledge the
absolute discretion of SmartGate and its Independent Committee of Directors to
make any and all decisions regarding the manner in which the RadioMetrix
Technology shall be commercialized and hereby waive any right to object thereto.
In the event that the Board of Directors identifies any matter before the Board
or SmartGate which involves a conflict of interest between SmartGate and the
Recipients, the decision or matters relating to or affected by said conflict of
interest shall be exclusively and

<PAGE>
                                                                               5

solely resolved by an Independent Committee of Directors appointed by the Board
of Directors. Such Independent Committee of Directors shall have full access to
independent legal counsel and independent advisors, including financial
advisors. In all such matters, including matters relating to the creation of an
Independent Committee of Directors or the determination of whether a conflict of
interest may be involved, Recipients who are directors or officers of SmartGate
shall abstain. Any determination as to whether a conflict of interest exists
shall be determined by the Independent Members of the Board of Directors with
all interested or conflicted Directors abstaining.

        7.      ARBITRATION. Any controversy or claim arising out of or relating
to this Agreement, or the breach thereof, shall be exclusively settled by
binding arbitration before the American Arbitration Association situated in
Tampa, Florida before a panel of three (3) arbitrators. All aspects of the
arbitration shall be governed by the rules then in effect of the American
Arbitration Association. Arbitration shall be the sole and exclusive manner for
resolving all disputes hereunder. Judgment upon the award rendered by the
arbitrators may be entered in any court having jurisdiction thereof. Each party
shall pay its respective share of the fees, costs and expenses billed by the
American Arbitration Association and the arbitrators, and the prevailing party
shall recover from the non-prevailing party all of the prevailing party's costs,
expenses and fees it incurred in connection with the arbitration, including
reasonable attorneys' fees.

        8.      ASSIGNMENT.

                a.      SmartGate shall not assign this Agreement without first
obtaining the written permission of the Super Majority.

                b.      Any one or all of the Recipients may assign this
Agreement without the permission of SmartGate.

        9.      NOTICES. All notices and other communications hereunder shall
be in writing and shall be deemed given if delivered personally or by commercial
delivery service, or mailed by registered or certified mail (return receipt
requested) or sent via telecopy to the parties at the following addresses (or at
such other address for a party as shall be specified by like notice):

                (a)        If to SmartGate:

                 To:       Independent Committee of Directors
                           SmartGate Inc.
                           4400 Independence Court
                           Sarasota, Florida 34234
                           Attention: Independent Committee Member,
                                      Edmund C. King
                           Fax: (941) 355-9373
                 Copy to:
                           Spitzer & Feldman, P.C.
                           405 Park Avenue
                           New York, NY 10022
                           Attention: Steven A. Sanders
                           Fax: (212) 838-7472

                    (b)    If to Recipients:
<PAGE>

                                                                              6

                To: The addresses set forth on Exhibit "A".

        10.     RULES OF CONSTRUCTION. The provisions of Section 8 of the
Indemnity Agreement to which this Agreement is attached as Exhibit "A" are
incorporated herein by this reference and made an integral part hereof.

        11.     MISCELLANEOUS. This Agreement shall be governed by and construed
in accordance with the laws of the State of Florida. This Agreement may be
executed by the parties hereto in separate counterparts, each of which, when so
executed and delivered, shall be an original but all counterparts shall together
constitute one and the same instrument. Facsimile signatures to this Agreement
are permitted and shall be deemed the same as the original signature of the
signing party for all purposes.

        IN WITNESS WHEREOF, the parties have caused this Agreement to be signed
by themselves or their duly authorized respective officers or representatives,
all as of the date first above written.

SmartGate Inc.                           Recipients
a Nevada Corporation
                                         /s/ STEPHEN A. MICHAEL
/s/ EDMUND C. KING                       -------------------------------
---------------------------              Stephen A. Michael
By:
Its: Chief Financial Officer
                                         Spencer Charles Duffey Irrevocable
                                         Trust u/a/d July 29, 1998

                                         /s/ WILLIAM W. DOLAN, TRUSTEE
                                         ------------------------------------
                                         William W. Dolan, Trustee

                                         Elizabeth Rosemary Duffey
                                         Irrevocable Trust u/a/d/ July 29, 1998

                                         /s/ WILLIAM W. DOLAN
                                         ------------------------------------
                                         William W. Dolan, Trustee

                                         /s/ ROBERT T. ROTH
                                         ------------------------------------
                                         Robert T. Roth

                                         /s/ WILLIAM W. DOLAN
                                         ------------------------------------
                                         William W. Dolan,

<PAGE>

                                  Exhibit "A"

Recipients

Stephen A. Michael
416 Burns Court
Sarasota, Florida  34236

Spencer Charles Duffey Irrevocable
Trust u/a/d July 29, 1998
c/o William W. Dolan, Trustee
416 Burns Court
Sarasota, Florida  34236

Elizabeth Rosemary Duffey Irrevocable
Trust u/a/d July 29, 1998
c/o William W. Dolan, Trustee
416 Burns Court
Sarasota, Florida  34236

Robert T. Roth
6008 Bay Valley Court
Orlando, Florida  32819

William W. Dolan
416 Burns Court
Sarasota, Florida 34236

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