Document:

<PAGE>   1
                                                                   EXHIBIT 10.52

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

                             RENAL CARE GROUP, INC.

                      NON-QUALIFIED STOCK OPTION AGREEMENT
                                   (1999 PLAN)

                                 R. DIRK ALLISON

         THIS AGREEMENT is made as of the Date of Grant, by RENAL CARE GROUP,
INC., a corporation organized and existing under the laws of the State of
Delaware (the "Company"), to R. DIRK ALLISON (the "Optionee").

         Upon and subject to the Additional Terms and Conditions attached hereto
and incorporated herein by reference as part of this Agreement, the Company
hereby awards as of the Date of Grant to Optionee an option (the "Option"), as
described below, to purchase the Option Shares.

         A.       DATE OF GRANT:    September 19, 2000.

         B.       TYPE OF OPTION:   Non-Qualified Stock Option.

         C.       EXERCISE PRICE PER SHARE: $15.938.

         D.       OPTION SHARES:    125,000 shares of the Company's Common
                  Stock, $.01 par value.

         E.       VESTING SCHEDULE:

                  The Vesting Schedule shall be as follows:

<TABLE>
<CAPTION>
                       Schedule                     Percentage of Option Shares Vested
                       -------                      ----------------------------------
                  <S>                               <C>
                  1st anniversary of                                25%
                  the Date of Grant

                  2nd anniversary of                                50%
                  the Date of Grant

                  3rd anniversary of                                75%
                  the Date of Grant

                  4th anniversary of                               100%
                  the Date of Grant
</TABLE>

<PAGE>   2

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

         F.       EXPIRATION DATE: This Option may be exercised at any time
                  after the Date of Grant through 5:00 p.m., Nashville,
                  Tennessee time, on the 10th anniversary of the Date of Grant,
                  provided that this Option may be exercised as to no more than
                  the vested Option Shares, determined pursuant to the Vesting
                  Schedule or as modified as provided herein.

         IN WITNESS WHEREOF, the Company has executed this Agreement the 19th
day of September, 2000.

                                            RENAL CARE GROUP, INC.

                                            By:      /s/ Sam A. Brooks
                                               ---------------------------------
                                                 Sam A. Brooks, President
ATTEST:

/s/ Douglas B. Chappell
------------------------------
Douglas B. Chappell, Secretary

                                            OPTIONEE:

                                            /s/ R. Dirk Allison
                                            ------------------------------------
                                            R. Dirk Allison
WITNESS:

/s/ Sam A. Brooks
------------------------------

                                       2
<PAGE>   3

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

                         ADDITIONAL TERMS AND CONDITIONS
                             RENAL CARE GROUP, INC.
                      NON-QUALIFIED STOCK OPTION AGREEMENT
                               FOR R. DIRK ALLISON

         1.       Exercise of Option. This Option may be exercised in whole or
in part, but in no less than one hundred (100) share lots, by written notice, in
substantially the form as Exhibit 1 hereto, directed to the Secretary of the
Company at its principal place of business, accompanied by payment of the
Exercise Price for the number of shares purchased. Payment shall be made in
cash, by check, or in shares of Common Stock already held by the Optionee prior
to the exercise of the Option. In the event that all or part of the Exercise
Price is paid in shares of Common Stock, the value of such shares shall be equal
to the Fair Market Value of such shares on the date of exercise of the Option,
and the Optionee shall deliver to the Company a certificate or certificates for
such shares.

         2.       Issuance of Option Shares. Upon a valid exercise of this
Option, the Company shall, or shall direct its transfer agent to, make delivery
of the Option Shares as soon as reasonably possible; provided, however, that the
Company shall not be required to issue or deliver any certificates for Option
Shares pursuant to this Option prior to (a) the completion of any registration
or qualification of such shares under any federal or state law, or any ruling or
regulation of any governmental body which the Board shall, in its sole
discretion, determine to be necessary or advisable, and/or (b) the Optionee
making at the time of exercise any reasonable representations and warranties
requested by the Company in order to qualify the issuance of the Option Shares
for exemptions from registration under state or federal securities laws. The
Option Shares issued on the exercise of this Option, when paid for as herein
provided, will be fully paid and non-assessable.

         3.       Termination of Employment or Death.

                  (a)      In the event of a termination of Optionee's
employment or consulting services for any reason (other than a termination of an
Optionee employee by his or her death or disability), (i) except as provided in
clause (ii) of this sentence this Option shall terminate as of the day of notice
of such termination by either party, but in no event later than the Expiration
Date, and (ii) any unexercised portion of this Option which is otherwise
exercisable on the date of termination may be exercised by Optionee at any time
within three (3) months following the date of such termination, unless Optionee
dies during such three (3) month period, but in no event later than the
Expiration Date. If Optionee is an employee, whether military, government or
other service by Optionee or other leave of absence granted to Optionee shall
constitute such a termination shall be determined in each case by the Board at
its discretion, and any determination by the Board shall be final and
conclusive. If the Board determines that such absence does not constitute such a

                                       3
<PAGE>   4
                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

termination, however, Optionee may exercise his or her option only with the
consent of the Board.

                  (b)      If Optionee is an employee, upon termination of
Optionee's employment with the Company (including its subsidiaries) as result of
a permanent disability (as defined by Section 22(e)(3) of the Code), (i) except
as provided in clause (ii) of this sentence, this Option shall terminate and be
unexercisable on the date of such termination, but in no event later than the
Expiration Date, and (ii) any unexercised portion of this Option which is
otherwise exercisable on the date of such termination may be exercised by
Optionee at any time within six (6) months following the date of such
termination, unless Optionee dies during such six (6) month period, but in no
event later than the Expiration Date.

                  (c)      If Optionee is an employee, upon termination of his
or her employment by the Company without Cause, if there is a written employment
agreement between Optionee and the Company, this Option shall cease to vest in
accordance with the Vesting Schedule regardless of any salary continuation
specified by such employment agreement as a result of such termination. Upon
termination of his or her employment with the Company, (i) except as provided in
clause (ii) of this sentence, this Option shall terminate and be unexercisable
as to unvested options on the date of termination, but in no event later than
the Expiration Date, and (ii) any unexercised portion of this Option which is
otherwise exercisable as of such termination date may be exercised by Optionee
at any time within three (3) months following such termination date, unless
Optionee dies during such three (3) month period such option may be exercised
pursuant to subparagraph (d) below, but in no event later than the Expiration
Date. If there is no written employment agreement between Optionee and the
Company, upon termination of his or her employment by the Company without Cause
any unexercised portion of this Option shall terminate in accordance with
Section 3(a) above, but in no event later than the Expiration Date.

                  (d)      If Optionee dies, (i) except as provided in clause
(ii) of this sentence, this Option shall terminate and be unexercisable on the
date of death, and (ii) any unexercised portion of this Option, if otherwise
exercisable at the date of death, may be exercised by his or her personal
representatives, heirs, or legatees at any time prior to the expiration of one
(1) year after the date of Optionee's death, but in no event later than the
Expiration Date.

         4.       Full Information. Optionee represents that he or she is
familiar with the business and affairs of the Company and realizes that the
receipt of the Option and Option Shares is a speculative investment and that any
possible profit therefrom is uncertain. Optionee further represents that he or
she has had the opportunity to ask questions of and receive answers from the
Company and any person acting on its behalf and to obtain all information
available with respect to the Company and its affairs, and has received all
information and data with respect to the Company that

                                       4
<PAGE>   5
                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

he or she has requested and which he or she has deemed relevant in connection
with his or her receipt of the Option and the Option Shares subject to the
Option.

         5.       No Rights in Option Stock. Optionee shall have no rights as a
stockholder with respect to any of the Option Shares prior to the date of
issuance to the Optionee of a certificate or certificates for such shares.
Optionee shall have no rights with respect to such shares not expressly
conferred by this Agreement.

         6.       Stock Reserved. The Company shall at all times during the term
of this Agreement reserve and keep available such number of shares of the Common
Stock as will be sufficient to satisfy the requirements of this Agreement, and
shall pay all original issue taxes on the exercise of this Option, and all other
fees and expenses necessarily incurred by the Company in connection therewith.

         7.       Nonassignability. This Option shall not be encumbered or
transferred in whole or in part except by will or the laws of descent and
distribution and is exercisable during the lifetime of the Optionee only by the
Optionee.

         8.       No Employment. This Agreement shall not give Optionee a right
to employment by, or membership on the board of directors of, the Company or its
subsidiaries.

         9.       Non-Qualified Option. It is the intent of the parties hereto
that this Option be a non-qualified stock option and subject to all of the
applicable provisions of the Internal Revenue Code of 1986, as amended. The
Company recognizes that the Optionee may be subject to restrictions regarding
his or her right to trade Common Stock under applicable securities laws.
Accordingly, the Optionee may want to consider making an election to be taxed
upon exercise of this Option under Section 83(b) of the Code. The Optionee shall
have sole discretion to make such an election and shall be solely responsible
for complying with the Code and all relevant rules and regulations in connection
with such election. The Optionee shall provide written notice to the Company of
such election immediately after making such election.

         10.      Share Adjustments. If the Company's outstanding shares of
Common Stock are increased or decreased or changed into or exchanged for a
different number or kind of shares or other securities of the Company by reason
of any recapitalization, reclassification, stock split, combination of shares,
stock dividend, or transaction having similar effect, the Board shall
proportionately and appropriately adjust the number and kind of shares that are
subject to this Option and the Exercise Price Per Share, without any change in
the aggregate price to be paid therefor upon exercise of this Option.

                                       5
<PAGE>   6
                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

         11.      Changes in Control.

                  (a) Change in Control. Subject to Section 12, in the event
  that a Change in Control shall occur, then (i) this Option (whether vested or
  not vested) shall automatically become one hundred percent (100%) vested
  immediately, and (ii) no other terms, conditions, restrictions or limitations
  shall be imposed upon this Option after such date, and in no circumstance
  shall this Option be forfeited on or after such date.

                    (b) Automatic Acceleration and Cash-Out. Subject to Section
  12, upon a Change in Control that results directly or indirectly in the Common
  Stock (or the stock of any successor the Company received in exchange for
  Common Stock) ceasing to be publicly traded on a national securities market at
  any time, (i) this Option shall automatically become one hundred percent
  (100%) vested immediately with respect to the Option Shares, (ii) no other
  terms, conditions, restrictions or limitations shall be imposed upon this
  Option after such date, and in no circumstance shall this Option be forfeited
  on or after such date, and (iii) this Option shall be valued and cashed out on
  the basis of the Change in Control Price.

                    (c) Section 16 Insider. Notwithstanding anything herein to
  the contrary, if the Optionee is subject to the reporting requirements of
  Section 16 of the Exchange Act with respect to the Company, and on the date of
  the Change in Control this Option has not been outstanding for a period of at
  least six months from the Date of Grant, the Optionee shall not be paid the
  consideration described in this Section 11 above until the first day next
  following the end of such six-month period.

           12. Modification, Extension and Renewal. The Board may modify, renew
  or accept the surrender of this Option, including the acceleration or waiver
  of any vesting or other restrictions or limitations, or the conversion of this
  Option (with appropriate adjustments) to be applicable to the securities of
  any successor corporation to the Company or parent of any such successor, and
  the Board may authorize new options in substitution for the Option. Any
  substituted, modified or converted options may bear such different or
  additional terms and conditions as the Board shall deem appropriate. The
  determination of the Board as to the terms of any of the foregoing may be made
  without regard to whether a Change in Control has or has not occurred (or
  whether the Board has determined that any event shall not be considered to be
  a Change in Control) and shall be conclusive and binding notwithstanding the
  provisions hereof regarding exercisability. Any fractional shares resulting
  from any of the foregoing adjustments under this Section shall be disregarded
  and eliminated. However, no modification of this Option shall, without the
  consent of the Optionee, adversely affect the rights or obligations of the
  Optionee with respect to this Option.

         13.      Administration. This Agreement shall be administered,
construed and interpreted by the Board.

                                       6
<PAGE>   7

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

         14.      Definitions.

                  "Board" means the Board of Directors of the Company.

                  "Change in Control" means a change in control of the Company
of a nature that would be required to be reported (assuming such event has not
been "previously reported") in response to Item 1(a) of a Current Report on Form
8-K pursuant to Section 13 or 15(d) of the Exchange Act; provided that, without
limitation, a Change in Control shall also be deemed to have occurred at such
time as:

                           (i)      any "person" within the meaning of Section
         14(d) of the Exchange Act, other than the Company, a Subsidiary, or any
         employee benefit plan(s) sponsored by the Company or any Subsidiary, is
         or has become the "beneficial owner," as defined in Rule l3d-3 under
         the Exchange Act, directly or indirectly, of 25% or more of the
         combined voting power of the outstanding securities of the Company
         ordinarily having the right to vote at the election of directors;

                           (ii)     individuals who constitute the Board
         immediately prior to any meeting of stockholders (the "Incumbent
         Board") have ceased for any reason to constitute at least a majority
         thereof after such shareholder meeting, provided that any person
         becoming a director whose election, or nomination for election by the
         Company's stockholders, was approved by a vote of at least
         three-quarters (3/4) of the directors comprising the Incumbent Board
         (either by a specific vote or by approval of the proxy statement of the
         Company in which such person is named as a nominee for director without
         objection to such nomination) shall be, for purposes of this Agreement,
         considered as though such person were a member of the Incumbent Board;

                             (iii)  upon approval by the Company's stockholders
         of a reorganization, merger, share exchange or consolidation, other
         than one with respect to which those persons who were the beneficial
         owners, immediately prior to such reorganization, merger, share
         exchange or consolidation, of outstanding securities of the Company
         ordinarily having the right to vote in the election of directors own,
         immediately after such transaction, more than 75% of the outstanding
         securities of the resulting corporation ordinarily having the right to
         vote in the election of directors; or

                             (iv) upon approval by the Company's stockholders of
         a complete liquidation and dissolution of the Company or the sale or
         other disposition of all or substantially all of the assets of the
         Company other than to a Subsidiary.

                  Notwithstanding the occurrence of any of the foregoing, the
Board may determine, if it deems it to be in the best interest of the Company,
that an event

                                       7
<PAGE>   8

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

or events otherwise constituting a Change in Control shall not be so considered.
Such determination shall be effective if it is made by the Board prior to the
occurrence of an event that otherwise would be or probably will lead to a Change
in Control or after such event if made by the Board a majority of which is
composed of directors who were members of the Board immediately prior to the
event that otherwise would be or probably will lead to a Change in Control. Upon
such determination, such event or events shall not be deemed to be a Change in
Control for any purposes hereunder, including but not limited to, Section 12.

                  "Code" means the Internal Revenue Code of 1986, as amended.

                  "Common Stock" means the Common Stock, $.01 par value, of
the Company.

                  "Exchange Act" means the Securities Exchange Act of 1934, as
amended, and the rules and regulations thereunder.

                  "Fair Market Value" means the closing price of the shares of
Common Stock on a national securities exchange on the day on which such value is
to be determined or, if no shares were traded on such day, on the next preceding
day on which shares were traded, as reported by the National Quotation Bureau,
Inc. or other national quotation service. If the shares are not traded on an
exchange but are traded in the over-the-counter market, on the day on which such
value is to be determined or, if such "asked" price is not available, the last
sales price on such day or, if no shares were traded on such day, on the next
preceding day on which the shares were traded, as reported by the National
Association of Securities Dealers Automatic Quotation System (NASDAQ) or other
national quotation service.

                  "Subsidiary" means any corporation that qualifies as a
subsidiary of a corporation under the definition of "subsidiary corporation"
contained in Section 424(f) of the Code.

                                    * * * * *

                                       8
<PAGE>   9

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

                                                                       EXHIBIT 1

                              NOTICE OF EXERCISE OF
                            STOCK OPTION TO PURCHASE
                                 COMMON STOCK OF
                             RENAL CARE GROUP, INC.

                                            Name:
                                                 -------------------------------

                                            Address:
                                                    ----------------------------

                                            Date:
                                                 -------------------------------

Renal Care Group, Inc.
Attention: [Secretary]
2100 West End, Suite 800
Nashville, Tennessee 37203

         Re: Exercise of Non-Qualified Stock Option

Ladies and Gentlemen:

         Subject to acceptance hereof in writing by Renal Care Group, Inc. (the
"Company"), I hereby give at least ten days but not more than thirty (30) days
prior notice of my election to exercise options granted to me to purchase
_____________ shares of Common Stock of the Company under the Renal Care Group,
Inc. Non-Qualified Stock Option Agreement granted on ______________________,
______. The purchase shall take place as of ______________________, ______ (the
"Exercise Date").

         On or before the Exercise Date, I will pay the applicable purchase
price by delivery of a certified check for $__________ for the full purchase
price payable to the order of Renal Care Group, Inc.

         The required federal, state and local income tax withholding, if any,
on the exercise of the option shall be paid on or before the Exercise Date.

         I hereby reaffirm that the representations made in Additional Terms and
Conditions of the Agreement are true and correct as of the date of exercising
this Option.

                                       9
<PAGE>   10

                                                [OFFICERS/EMPLOYEES/CONSULTANTS]

         As soon as the stock certificate is registered in my name, please
deliver it to me at the above address.

                                               Very truly yours,

AGREED TO AND ACCEPTED:

RENAL CARE GROUP, INC.

By:
   ---------------------------------------

Title:
      ------------------------------------

Number of Shares Exercised:
                           -------------------------

Number of Shares Remaining:
                           ------------------------

Date:
     --------------------

                                       10<PAGE>   1

                                                                   EXHIBIT 10.12

                           ELEVENTH AMENDMENT TO LEASE

         THIS AGREEMENT made this 20th day of April, 2000 by and between KGE
Associates, L.P., a partnership hereinafter referred to as "Landlord" and
Telemate.Net Software, Inc., a Georgia Corporation hereinafter referred to as
"Tenant".

         WHEREAS, the parties hereto made and entered into a lease agreement
dated January 28, 1992 and amended on June 11, 1993, June 22, 1994, March 30,
1995, June 14, 1996, July 26, 1996, August 2, 1996, July 16, 1998, November, 9,
1999, November 10, 1999 and November 15, 1999 for certain premises (hereinafter
referred to as the "Premises") situated at Perimeter Crest Office Park, 4250
Perimeter Park Drive, Suite 200, Atlanta, Georgia 30341.

         NOW, THEREFORE, in consideration of the mutual promises given one to
the other, the parties hereto intending to be legally bound, do hereby covenant
and agree as follows:

         PREMISES.

         The Premises currently being leased by Tenant under the Lease is 52,848
         square feet. With this expansion the space being leased by Tenant will
         be 56,173.

         1)       EXPANSION SPACE

         a.       The Premises shall be expanded to include an additional 3,325
         square feet, as shown in yellow on Exhibit "B" attached and made a part
         hereto ("Expansion Premises") located at 4250 Perimeter Park South,
         Suites 102 and 109, Atlanta, Georgia 30341. Commencement Date" means
         the later of (1) Landlord's delivery of possession of the Expansion
         Premises to Tenant, or (ii) July 1, 2000. If by the Commencement Date
         Landlord has not substantially completed the improvements to the
         Expansion Premises required to be made hereof or if Landlord, for any
         reason whatsoever cannot deliver possession of the Expansion Premises
         to Tenant by the Commencement Date, then the Commencement Date shall be
         postponed (and rent herein provided, pro-rata to the Expansion
         Premises, shall not commence) until the earlier of either (I) the date
         of actual occupancy of the Expansion Premises by Tenant or (ii) the
         date immediately following the day Landlord has achieved substantial
         completion of such improvements.

         b.       If, and to the extent, Landlord's substantial completion of
         the improvements to Expansion Premises pursuant to Exhibit "A" attached
         hereto is delayed due to any act or omission of Tenant or anyone acting
         under or for Tenant (any such delay being hereinafter referred to as
         "Tenant's Delay"), then the Commencement Date shall be the date
         specified above, subject to adjustment as provided therein, but without
         extension as result of Tenant's Delay; provided that from the
         Commencement Date, as so determined, until the earlier of (I) the date
         of actual occupancy of the Expansion Premises by Tenant or (ii) the
         date immediately following the date Landlord should have achieved
         substantial completion of such improvements but for Tenant's Delay,
         Tenant's obligations under this Lease shall be to the payment of any
         and all Rent due hereunder.

         c.       Within five (5) days of written request by Landlord, Tenant
         agrees to execute and deliver to Landlord a Letter Agreement As To Term
         and Premises pursuant to Exhibit "B" attached and made a part hereof,
         setting forth the exact Commencement

<PAGE>   2

         Date of the Expansion and stating that all tenant improvements to be
         constructed by Landlord have been substantially completed, subject to
         any outstanding punch-list items.

         2)       ALTERATIONS AND IMPROVEMENTS

         a.       Landlord will make available a Tenant Improvements Allowance
         ("Landlord's Tenant Improvement Allowance") of $14.00 per square foot
         of Expansion Space. Included as part of the Tenant Improvement
         Allowance shall be a construction management fee in the amount of five
         percent (5%) of the actual improvement cost, and all costs associated
         with architectural & mechanical drawings. The design and construction
         of the Tenant Improvements shall be in accordance with working drawings
         to be approved by Landlord and Tenant prior to commencement of
         construction. The Premises will be prepared in accordance with Exhibit
         "A" attached hereto and by this reference made a part hereof
         ("Landlord's Construction"). Landlord shall have such work performed
         promptly, diligently and in a good and workmanlike manner. The
         aforementioned Tenant Improvement Allowance shall be utilized by the
         earlier of 1) June 30, 2001 or 2) 90 days from the day Building 4250,
         Suite 119, which is presently occupied by Heritage Property Management
         becomes vacant. Should Tenant fail to utilize the Tenant Improvement
         Allowance by June 30, 2001 then this obligation of the Landlord shall
         be null and void and of no further force or effect. Landlord agrees and
         acknowledges to allow Tenant to utilize any excess Tenant Improvement
         Allowance within the existing premises or within other premises
         occupied by Tenant for improvements to the Premises. Tenant
         acknowledges and agrees that any such work to be performed pursuant to
         the herein defined excess Tenant Improvement Allowance, shall be
         subject to Landlord's reasonable approval and in the event Tenant does
         not utilize the excess Tenant Improvement Allowance prior to December
         31, 2001; this obligation of the Landlord shall be null and void and of
         no further force or effect.

         b.       Upon substantial completion of Landlord's Construction, Tenant
         shall inspect the Premises and identify "punch-list" items for Tenant's
         final acceptance. "Substantial Completion" means the Premise is
         reasonably satisfactory for acceptance and in accordance with the work
         depicted on Exhibit "A".

         c.       Tenant may request substitutions, additional or extra work
         and/or materials over and above that required as depicted and described
         on Exhibit "A" hereof and/or under Tenant's approved Plans to be
         performed by Landlord, provided that the Extra Work, at Landlord's
         option, (I) shall not require the uses of contractors or types of
         contractors other than those normally engaged by Landlord in the
         Building; (ii) shall not delay completion of Landlord's Construction or
         the Commencement Date; (iii) shall be practicable and consistent with
         existing physical conditions in the Building and with plans for the
         Building which have been filed with the applicable governmental
         authorities having jurisdiction thereover; (iv) shall not impair
         Landlord's ability to perform any of Landlord's obligations hereunder
         or under this Lease or any other Agreement with respect to space in the
         Building; (v) shall not affect any portion of the Building other than
         the Premises; and (vi) any such work requested by Tenant and approved
         by Landlord, shall not cause Landlord's Construction to exceed the
         Tenant Improvement Allowance provided for herein. All Extra Work shall
         require the installation of new materials and shall be otherwise
         subject to Landlord's reasonable approval.

<PAGE>   3

         3)       TERM

         This Eighth Lease Amendment shall commence on the Commencement Date as
         defined herein and terminate September 30, 2003.

         4)       BASE RENTAL

         Tenant agrees to pay base rental for the Premises in accordance with
         the base rental schedules, and during the term, as defined in the Sixth
         Amendment to Lease, Seventh Amendment to Lease, Eighth Amendment to
         Lease, Ninth Amendment to Lease, Tenth Amendment to Lease and this
         Eleventh Amendment to Lease, Tenant agrees to pay base rental for the
         Expansion Premises (5,962 square feet) to Landlord during the term as
         defined in this Eighth Amendment To Lease, payable on or before the
         first day of each and every month, in advance, in accordance with the
         following schedule:

<TABLE>
<CAPTION>
         Payment Periods      Monthly Rent      Annual Base Rent   Base Rent/SF
         ---------------      ------------      ----------------   ------------

         <S>                  <C>               <C>                <C>
         7/1/00-6/30/01         $3,485.71           $41,828.50        $12.58
         7/1/01-6/30/02         $3,607.63           $43,291.50        $13.02
         7/1/02-6/30/03         $3,735.08           $44,821.00        $13.48
         7/1/03-09/30/03        $3,865.31           $46,383.75        $13.95
</TABLE>

All other terms, provisions and covenants of the Lease Agreement dated January
28, 1992, as further amended, shall remain in full force and effect.

                         (Signatures on following page)

<PAGE>   4

         IN WITNESS WHEREOF, the parties herein have hereto set their hands and
seals, in duplicate, the day and year first above written.

                                    "LANDLORD"

                                    KGE ASSOCIATES, L.P.

                                    By:      /s/ Elizabeth Hawkins
                                       -----------------------------------------

                                    Its:
                                        ----------------------------------------

                                    Date:             5/25/01
                                         ---------------------------------------

                                    "TENANT"

                                    TELEMATE.NET SOFTWARE, INC.

                                    By:      /s/  Janet Van Pelt
                                       -----------------------------------------

                                    Its:     CFO
                                        ----------------------------------------

                                    Date:    5/24/01
                                         ---------------------------------------

<PAGE>   5

                                   EXHIBIT "A"

                             LANDLORD'S CONSTRUCTION

TENANT'S PLANS AND SPECIFICATIONS.

Landlord and Tenant, at Landlord's sole cost and expense, subject to provisions
of Paragraph 6 hereof, shall cause to be prepared by Landlord's architect and/or
designer and/or engineer the following:

         (a)      Complete, finished, detailed construction documents and
specifications for Tenant's partition layout, ceiling and other installations
for the work to be done by Landlord under Paragraph 6 hereof, subject to
limitations therein, which shall be prepared by Landlord's architect and/or
designer.

         (b)      Complete mechanical and electrical plans and specifications
where necessary for the installation of air conditioning system and ductwork,
heating, electrical, plumping and other engineering plans for the work to be
done by Landlord under Paragraph 6 hereof, subject to limitations therein, which
shall be prepared by Landlord's architect and/or designer and/or engineer.

         (c)      Any subsequent modifications to the construction documents and
specifications requested by Tenant.

All such plans and specifications are expressly subject to Landlord's approval
and shall comply with all applicable laws, rules, regulations and conditions of
Paragraph 6 hereof. Tenant's Plans shall be delivered to Tenant for Landlord's
approval on or before ________________ (subject to written modification between
the parties). Such approval shall not be unreasonably withheld. If Tenant shall
have reasonable grounds for withholding its approval of Tenant's Plans, Tenant,
within three (3) business days of receipt of Tenant's Plans, shall provide
Landlord with written notice of its disapproval detailing with specificity those
aspects of Tenant's Plans which Tenant disapproves. In the event Tenant fails to
provide Landlord with written notice within such three (3) business day period,
Tenant shall conclusively be deemed to have approved Tenant's Plans. In the
event Tenant provides timely written notice of its disapproval of Tenant's
Plans, within such three (3) business day period, Landlord shall amend Tenant's
Plans accordingly and deliver the amended plans to Tenant for approval. The same
procedures as for the original Tenant's Plans shall be applicable to any
amendments of Tenant's Plans under the preceding sentences. If Tenant shall fail
to approve Tenant's Plans within the times provided in this paragraph, then and
in addition to any other rights or remedies of Landlord, at Landlord's option,
may terminate this Lease Agreement and/or accelerate by the number of days of
such delay the Commencement Date. In addition, Tenant shall reimburse Landlord
for any and all expenses, losses, costs and damages suffered by Landlord and
caused by such delay. Such option shall not be exercised until at least fifteen
(15) days after the default in question.

         2.       Without the prior written consent of Landlord, Tenant shall
make no changes in Tenant's Plans after approval thereof.

         3.       After approval of Tenant's Plans, Landlord shall obtain from
its general contractor and submit to Tenant a quotation of the cost of
improvements of the Premises in

<PAGE>   6

accordance with Tenant's Plans. Upon written approval of such quotation by
Tenant, Landlord and Tenant shall be deemed to have given final approval to
Tenant's Plans, including but not limited to a date for completion of the work
required thereunder, and Landlord shall be authorized to proceed with the
improvements of the Premises in accordance with Tenant's Plans. Failure of
Tenant to reasonably approve any such quotation shall abate Landlord's
obligation to proceed with any improvements of the Premises, but shall not
postpone the Commencement Date by more than seven (7) days.

Tenant's Plans and a quotation of the cost of Tenant's extra work (as
hereinafter defined) shall be finally approved by Tenant and Landlord as
provided herein no later than __________________. A copy of Tenant's Plans as so
finally approved shall be signed and dated by both Tenant and Landlord and
delivered to Landlord for its records. A copy of the construction contract for
the improvements of the Premises in accordance with approved Tenant's Plans
shall be initialed and dated by both Tenant and Landlord and attached to this
Lease as an additional exhibit hereto.

LANDLORD'S CONSTRUCTION

Landlord agrees, subject to limitations of Paragraph 6 hereof, at Landlord's
sole cost and expense and in conformance with Construction Documents to provide
and install the Tenant Improvements substantially in accordance with Tenant's
Plans as approved by Landlord and Tenant.

EXTRA WORK

Tenant may request substitutions, additional or extra work and/or materials over
and above that required in Paragraph 2(a) hereof and/or under Tenant's Plans
approved above (herein called "Extra Work") to be performed by Landlord,
provided that the Extra Work, at Landlord's option, (i) shall not require the
use of contractors or types of contractors other than those normally engaged by
Landlord in the Building; (ii) shall not delay completion of Landlord's
Construction or the Commencement Date; (iii) shall be practicable and consistent
with existing physical conditions in the Building and with plans for the
Building which have been filed with the applicable governmental authorities
having jurisdiction thereover; (iv) shall not impair Landlord's ability to
perform any of Landlord's obligations hereunder or under this Lease or any other
Agreement with respect to space in the Building; and (v) shall not affect any
portion of the Building other than the Premises. All Extra Work shall require
the installation of new materials and shall be otherwise subject to Landlord's
reasonable approval.

         2.       Subject to Landlord's written consent, Tenant may request the
omission of an item of work required under the approved Tenant's Plans, provided
that such omission shall not delay the completion of the Premises, and Landlord
thereafter shall not be obligated to install same. No credit shall be granted to
Tenant for such omitted items.

PAYMENTS

As costs are incurred and bills are received by Landlord in the performance of
Extra Work, Tenant shall make periodic payments to Landlord within ten (10) days
after receipt by Tenant of a statement therefore from Landlord.

COOPERATION

<PAGE>   7

All work not within the scope of the normal construction trades employed for the
Building, such as the furnishing and installing of draperies, furniture,
telephone equipment and wiring, alarm systems, and office equipment, shall be
furnished and installed by Tenant at Tenant's expense. Tenant shall adopt a
schedule in conformance with the schedule of Landlord's contractors and shall
conduct its work in such a manner as to maintain harmonious relations and as not
to interfere unreasonably with or delay the work of Landlord's contractors.
Tenant shall cause its telephone and alarm contractors to contact Landlord with
regard to installation of a telephone system in the Premises within three (3)
business days of the date Landlord commences construction of the Premises.

<PAGE>   8

                                   EXHIBIT "C"

KGE Associates, LP ("Landlord") and Telemate.Net Software, Inc., a Georgia
corporation ("Tenant"), do each hereby agree and certify to the other that the
Term of that certain Eleventh Amendment to Lease between Landlord and Tenant
dated April 20, 2000, ("Lease") commenced on the day of May 25, 2000,
and will expire on the 30th day of September, 2003, unless extended or sooner
terminated as may be provided in the Lease. Tenant hereby acknowledges that it
has accepted delivery of the Phase I Premises, containing 3,325 rentable square
feet, in "substantially complete" condition as defined in the Lease, and that
said Premises are in full compliance with all requirements of the Lease, except
for defects of which Tenant gives Landlord notice with reasonable specificity
within ten (10) business days from the Commencement Date referenced above.

IN WITNESS WHEREOF, the parties have caused their duly authorized
representatives to execute this instrument under seal as of the 25 day of May,
2000.

ATTEST:                                     LANDLORD: KGE ASSOCIATES, LP

                                            By:     /s/ Elizabeth B. Hawkins
-------------------------                       --------------------------------

                                            Title: Secretary of General Partner
                                                  ------------------------------

                                            Its:
                                                --------------------------------

                                            Date:           5/25/00
                                                 -------------------------------

ATTEST:                                     TENANT:  TELEMATE.NET SOFTWARE, INC.

                                            By:     /s/ Janet Van Pelt
-------------------------                       --------------------------------

                                            Title:           CFO
                                                  ------------------------------

                                            Date:           5/25/00
                                                 -------------------------------
                                                      (Corporate Seal)

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