EXHIBIT 10.17

                            THIRD AMENDMENT OF LEASE

     THIS THIRD AMENDMENT OF LEASE ("Third Amendment") is made on August 3, 2001
between  TRIZECHAHN  CENTERS INC., a California  corporation,  d/b/a "TrizecHahn
Newmarket 1 to 8 Management"  ("Landlord"),  whose address is 100 Colony Square,
Suite 600, 1175 Peachtree Street, N.E., Atlanta, GA 30361 and CRYOLIFE,  INC., a
Florida corporation ("Tenant").

                                    RECITALS

     This Third Amendment is based upon the following recitals:

     A.  Newmarket  Partners I,  Limited  ("Newmarket"),  as landlord and Tenant
entered into a Lease dated July 23, 1993 ("Lease"),  for the premises  measuring
11,227  rentable  square feet and known as Suite 124  located at 2121  Newmarket
Parkway, Marietta, GA 30067 ("Premises").

     B. Newmarket and Tenant amended the Lease by First Amendment to Lease dated
June 9,  1994 and  Second  Amendment  to Lease  dated  June 6, 1998  (Lease  and
Amendment(s) collectively, "Lease as amended").

     C.  Landlord is successor in interest to  Newmarket's  interest as landlord
under the Lease as amended.

     D. The Premises  size  currently  measures  approximately  11,227  rentable
square feet and includes Suite 124 of the Building.

     E.  Landlord  and Tenant  desire to  further  amend the Lease as amended to
extend the term and otherwise amend the Lease as
amended accordingly.

     THEREFORE,  in consideration of the mutual covenants and agreements  stated
in the  Lease as  amended  and  below,  and for other  sufficient  consideration
received and acknowledged by each party,  Landlord and Tenant agree to amend the
Lease as amended as follows:

     1. RECITALS. All recitals are fully incorporated.

     2. ADDRESS - NOTICES.  Landlord's address for notices as set forth in Lease
as amended shall be deleted and the following substituted therefor:

        TRIZECHAHNCENTERS  INC.
        c/o TrizecHahn Office Properties,  Inc.
        100 Colony  Square,   Suite  600
        1175 Peachtree Street, N.E.
        Atlanta, GA 30361
        Attention: David D. Canaday, Vice President

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        with a copy to:

        TRIZECHAHN CENTERS INC.
        c/o TrizecHahn Office Properties, Inc.
        100 Colony Square, Suite 600
        1175 Peachtree Street, N.E.
        Atlanta, GA 30361
        Attention: Lease Administrator

        and if notice of default, a copy to:

        TRIZECHAHN CENTERS INC.
        c/o TrizecHahn Office Properties, Inc.
        100 Colony Square, Suite 600
        1175 Peachtree Street, N.E.
        Atlanta, GA 30361
        Attention: Regional Counsel

     3.  EXTENSION  OF LEASE  TERM.  The Lease  Term for the  Premises  shall be
extended for  approximately  thirteen  and  one-half  (13 1/2) months,  to begin
November 16, 2001 and expire on December 31, 2002 ("2nd Extension Term").

     4. RENTAL,  COMMON AREA MAINTENACE  EXPENSES,  TAX AND INSURANCE ESCALATION
EXPENSES.Effective during 2nd Extension Term, Tenant's obligation to pay Rental,
Common Area Maintenance Expenses and Tax and Insurance Escalation Expenses shall
be as follows with respect to the Premises:

          A. RENTAL.  Effective during the 2nd Extension Term,  Tenant shall pay
Landlord  monthly rental in advance on the first day of each month in the amount
of $9,355.83; and

          B. COMMON AREA MAINTENACE  EXPENSES.  Tenant shall reimburse  Landlord
for the cost of Common Area Maintenance Expenses (as described in Paragraph 4 of
the Lease, "CAM") which shall be $0.80 per rentable square foot and subject to a
4% annual increase each calendar year; and

          C. TAX AND INSURANCE  ESCALATIONS  EXPENSES. In addition to Rental and
CAM,  Tenant shall continue to be responsible  for tax and insurance  escalation
expenses with respect to the entire  Premises in  accordance  with the terms and
conditions  of  Paragraph 5 of the Lease;  however the base year with respect to
determining tax and insurance  escalation expenses for the Premises shall be the
calendar year ending December 31, 2002.

     5. DELIVERY OF AND IMPROVEMENTS TO THE PREMISES. Landlord shall provide and
Tenant  shall accept the  Premises in "as-is"  condition.  No promises to alter,
remodel or improve the  Premises or Building and no  representations  concerning
the  condition of the Premises or Building  have been made by Landlord to Tenant



other than as may be expressly stated in the Lease as amended.

     6.  HOLDOVER.  Tenant  understands  that it does not have the right to hold
over at any time and  Landlord  may  exercise  any and all remedies at law or in
equity to recover possession of the Premises, as well as any damages incurred by
Landlord,  due to Tenant's failure to vacate the Premises and deliver possession
to Landlord as required by this Lease. If Tenant holds over after the expiration
of the 2nd Extension Term with Landlord's prior written consent,  Tenant will be
deemed to be a tenant  from  month to month,  at a monthly  Rental,  payable  in
advance, equal to 150% of the monthly Rental payable during the last year of the
2nd  Extension  Term,  and  Tenant  will be  bound  by all of the  other  terms,
covenants  and  agreements  of the Lease as  amended  as the same may apply to a
month-to-month  tenancy.  If Tenant holds over after the  expiration  of the 2nd
Extension Term without Landlord's prior written consent, Tenant will be deemed a
tenant at sufferance,  at a daily Rental,  payable in advance,  equal to 200% of
the Rental per day payable  during the 2nd  Extension  Term,  and Tenant will be
bound by all of the  other  terms,  covenants  and  agreements  of the  Lease as
amended as the same may apply to a tenancy at sufferance.

     7.  BROKERS.  Landlord and Tenant  represent  and warrant that no broker or
agent negotiated or was  instrumental in negotiating or consummating  this Third
Amendment  except  TrizecHahn  Colony Square GP LLC and Richard Bowers & Company
("Brokers"). Neither party knows of any other real estate broker or agent who is
or might be entitled to a commission or  compensation  in  connection  with this
Third  Amendment.   Pursuant  to  Georgia  Real  Estate  Commission   Regulation
520-1-108,  TrizecHahn  Colony  Square GP LLC  hereby  discloses  the  following
concerning  this  lease  transaction:   (1)  TrizecHahn  Colony  Square  GP  LLC
represents  Landlord  and not Tenant;  (2) Richard  Bowers & Company  represents
Tenant  and not  Landlord;  and (3) both  TrizecHahn  Colony  Square  GP LLC and
Richard Bowers & Company shall receive their compensation from Landlord.  Tenant
and Landlord will  indemnify and hold each other  harmless from all damages paid
or incurred by the other resulting from any claims asserted against either party
by brokers or agents claiming through the other party.

     8.  CONFLICTING  PROVISIONS.  If any  provisions  of this  Third  Amendment
conflict with any of those of the Lease as amended,  then the provisions of this
Third Amendment shall govern.

     9. REMAINING LEASE  PROVISIONS.  Except as stated in this Third  Amendment,
all other viable and applicable  provisions of the Lease as amended shall remain
unchanged and continue in full force and effect throughout the Lease Term.

     10.  BINDING  EFFECT.  Landlord and Tenant  ratify and confirm the Lease as
amended and agree that this Third  Amendment shall bind and inure to the benefit
of the parties, and their respective successors,  assigns and representatives as
of the date first stated.

                    -signatures appear on the following page-



     AFFIRMING  THE ABOVE,  the parties have  executed  this THIRD  AMENDMENT OF
LEASE on the date first stated.


WITNESSES:                         LANDLORD:
                                   TRIZECHAHN CENTERS INC., a
                                   California corporation

  /s/   Mardi Taft                 BY:  /s/   Robert R. Stubbs
- --------------------------             --------------------------------
                                           Robert R. Stubbs
                                           Assistant Secretary


  /s/  Carmel Malfeo               BY:  /s/   Antonio A. Bismonte
- --------------------------             --------------------------------
                                           Antonio A. Bismonte
                                           Vice President

                                   TENANT:
                                   CRYOLIFE, INC., a Florida
                                   corporation

                                   By:  /s/   Albert E. Heacox
                                       --------------------------------
                                   ITS:  Sr. V.P. Laboratory Operations
                                        -------------------------------



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