Document:

EXHIBIT 10.18

                            FOURTH AMENDMENT OF LEASE

     THIS FOURTH  AMENDMENT OF LEASE  ("Fourth  Amendment")  is made on June 25,
2002 between TRIZEC REALTY, INC., a California corporation  ("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 Fourth 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  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.

     C. Newmarket  subsequently  assigned its interest as landlord to TrizecHahn
Centers Inc. ("TrizecHahn").

     D.  TrizecHahn and Tenant amended the Lease by Third Amendment dated August
3, 2001 (Lease and Amendment(s) collectively, "Lease as amended").

     E. Landlord is successor in interest to  TrizecHahn's  interest as landlord
under the Lease as amended.

     F.  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.  EXTENSION  OF LEASE  TERM.  The Lease  Term for the  Premises  shall be
extended for  approximately one (1) year, to begin January 1, 2003 and expire on
December 31, 2003 ("Third Extension Term").

     3. RENTAL, COMMON AREA MAINTENANCE  EXPENSES,  TAX AND INSURANCE ESCALATION
EXPENSES.  Effective during the Third 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:

<PAGE>

          A. RENTAL. Effective during the Third Extension Term, Tenant shall pay
Landlord  monthly rental in advance on the first day of each month in the amount
of $8,888.04; and

          B. COMMON AREA MAINTENANCE  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 $0.83 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, 2003.

     4. 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.

     5.  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 Third 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
Third  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 Third
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 Third  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.

     6.  BROKERS.  Landlord and Tenant  represent  and warrant that no broker or
agent negotiated or was instrumental in negotiating or consummating  this Fourth
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
Fourth  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

                                       2
<PAGE>

or incurred by the other resulting from any claims asserted against either party
by brokers or agents claiming through the other party.

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

     8. REMAINING LEASE  PROVISIONS.  Except as stated in this Fourth 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.

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

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

WITNESSES                          LANDLORD
                                   TRIZEC REALTY, INC., a California corporation

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

                                   BY:   /s/ Stephen E. Budorick
-----------------------               -------------------------------------
                                         Stephen E. Budorick
                                         Vice President

                                   TENANT
                                   CRYOLIFE, INC., a Florida corporation

/s/ Felicia E. Trott               BY:   /s/ Albert E. Heacox
-----------------------               ------------------------------------

                                   ITS:  Sr. V.P. Laboratory Operations
                                       -----------------------------------

                                       3
1544973v1Exhibit 10.1

  
  
 EXHIBIT
10.1 
  
 THIS LEASE, made this 11th day of July, 2002 between R C Realty Corp. (hereinafter called Lessor) and
MainStreet BankShares, Inc. (hereinafter called Lessee) which terms “Lessor” and “Lessee” shall include, wherever the context admits or requires, singular or plural and their heirs, legal representatives, successors and assigns
of the respective parties; 
  
 WITNESSETH: 
  
 PREMISES 
  
 That the Lessor, in consideration of the
covenants of the Lessee, does hereby lease and demise unto said Lessee and Lessee hereby agrees to take and lease from the Lessor, for the terms hereinafter specified the following described premises: 
  
 That certain store building (Unite 12) containing approximately 2,000 square feet of area located in the Patrick Henry Mall shopping
center development located at 730 East Church Street in the City of Martinsville, Virginia as marked in red on the attached Exhibit A. 
  
 TERM 
  
 For the Lessee to have and to hold for a period of five years commencing August 1,
2002 and terminating July 31, 2007 except as stipulated under Article 19. This lease is granted and accepted upon the following terms, covenants, conditions and stipulations: 
  
 RENTAL 
  
 1.  The Lessee agrees to pay to the
Lessor as rental for the demised premises during the first three years of the lease term $14,000.00 per annum with monthly payments of $1,166.67. Rental for the last two years of the lease term will be $15,000.00 per annum with monthly payments of
$1,250.00. The rental shall be due and payable in advance on the first of each and every calendar month of the lease term, and any extensions thereof. The first month’s payment shall be payable at the signing of this lease. 

 
 USE 
  
 2.  The demised premises shall be used primarily as operations offices for MainStreet BankShares, Inc. Lessee’s employees, customers and invitees are granted full use of the common areas of the shopping center. Lessee
at all times shall fully and promptly comply with all laws, ordinances and regulations of every lawful authority having jurisdiction of said premises and the character and manner of operation of the business conducted in or at said premises.

  
 UTILITIES 
  
 3.  The Lessee agrees to pay for all utilities used by Lessee at the demised premises. Lessor shall at all times provide access to utilities. 
  
 LESSEE’S REPAIRS 
  
 4.  The Lessee accepts the
premises “as is”. Lessee agrees to keep the interior of the demised premises, along with the florescent fixtures, windows and exterior plate glass in good condition and repair, excepting all repairs which are made necessary by reason of
fire and other unavoidable casualties and reasonable wear and tear. 
  
 LESSOR’S REPAIRS 
  
 5.  The Lessor shall, at its cost and expense, keep and maintain the common areas (including the parking area) in good condition
and repair, and shall maintain the exterior of the Lessee’s building, including the roof, gutter, downspouts, masonry walls, foundation and structural members in good condition and repair, and shall make any and all structural repairs to the
exterior of said premises. 
  
 SIGNS 
  
 6.  Lessee may place, erect and maintain, with the approval of the Lessor, signs under the canopy in front of their store, but the signs must be compatible with signs of adjoining Lessees and
not obstruct the view of other signs. Signs under canopy must be uniform in size and design for all Lessees. All signs shall remain the property of Lessee and may be removed at any time during the term of this lease, or any extensions thereof,
provided Lessee shall repair or reimburse Lessor for the cost of any damage to the demised premises resulting from the installation or removal of such signs. 
  

 

  
  
 FIXTURES AND INTERIOR
ALTERATIONS 
  
 7.  The Lessee, at its own expense and with the written approval of Lessor which shall
not be unreasonably withheld, may from time to time during the term of this lease, make any interior alterations, additions, and improvements in and to the demised premises which it may deem necessary or desirable and which do not adversely affect
the structural integrity thereof, but it shall make them in a good workmanlike manner and in accordance with all valid requirements of municipal or other governmental authorities. All permanent structural improvements shall belong to the Lessor and
become a part of the premises upon termination or expiration of this lease. 
  
 LESSEE may construct and build or
install in said premises any and all racks, counters, shelves, and other fixtures and equipment of any kind and nature as may be necessary or desirable in the Lessee’s business, which racks, counters, shelves, and other fixtures and equipment
shall at all times be and remain the property of the Lessee and Lessee shall have the right to remove all or any part of same from said premises at any time; provided Lessee shall repair or reimburse Lessor for the cost of repairing any damage to
said premises resulting from the installation or removal of such items. 
  
 INDEMNIFICATION 
  
 8.  Lessee agrees to indemnify and save harmless the Lessor from any claim or loss by reason of accident or damage to any person
or property happening on or about demised premises. 
  
 CLEANLINESS 
  
 9.  Lessee shall at all times keep the interior of the building in a reasonably neat and orderly condition and shall keep the walkway, entryways and delivery
areas adjoining the building reasonably clean and free from rubbish, dirt, snow, and ice. Lessee will not make or suffer any waste of the premises or permit anything to be done in or upon the demised premises creating a nuisance thereon, and Lessee
further agrees to permit Lessor or its agent at all reasonable times to enter upon the premises for making repairs and for examining or showing the same to prospective purchasers and/or Lessees with a minimum 24 hour notice give to Lessee by Lessor.

  
 QUIET ENJOYMENT 
  
 10.  The Lessor covenants, warrants and represents that upon commencement of the lease term, the shopping center, including the demised premises, will be free and clear of all liens and encumbrances superior to the
leasehold hereby created; that the lessor has full right; and power to execute and perform this lease and to grant the estate demised herein; and that the Lessee on paying the rent herein reserved and performing the covenants and agreements hereof
shall peaceably and quietly have, hold and enjoy the demised premises and all rights, easements, appurtenances and privileges belonging or in anyway appertaining thereto during the full term of this lease and any extensions thereof. 

 
 DEFAULT 
  
 11.  In the event the Lessee should fail to pay any of the monthly installments of rent reserved herein for a period of more than ten (10) days after the same shall become due and payable, or if the Lessee shall fail to
keep or shall violate any other condition, stipulation or agreement contained, on the part of the Lessee to be kept and performed, and if either such failure or violation shall have continued for a period of thirty (30) days after the Lessee shall
have received written notice by certified or registered mail at its office address hereinafter designated, from the Lessor to pay such rent or to cure such violation of failure, then, in any such event, the Lessor, at its option, may either (a)
terminate this lease, or (b) re-enter the demised premises by summary proceeding or otherwise expel Lessee and remove all property therefrom and relet the premises at the best possible rent obtainable, making reasonable efforts and received the rent
therefrom; but Lessee shall remain liable for the deficiency, if any, between Lessee’s rent hereunder and the price obtained by Lessor on reletting. However, a default shall be deemed cured if the Lessee in good faith commences performance
requisite to cure same within thirty (30) days after receipt of notice and thereafter continuously and with reasonable diligence proceeds to complete the performance required to cure such default. 
  
 NOTICES 
  
 12.  All notices required to be given to the Lessor hereunder shall be sent by registered or certified mail to, and all rent payments shall be made to Lessor at P. O. Box 952, Martinsville, VA 24114 or to such other address
as Lessor may direct from time to time by written notice forwarded to Lessee by registered or certified mail. 
  
 All
notices required to be given to Lessee shall be sent by registered or certified mail to Lessee c/o Cecil R. McCullar, 730 East Main Street, Suite #12, P. O. Box 1224, Martinsville, Virginia, 24114-1224, or to such other address as Lessee may direct
from time to time by written notice forwarded to Lessor by registered or certified mail. 
  

  
  
 END OF TENANCY

  
 13.  The Lessee will yield up the demised premises and all additions thereto (except sign,
equipment and trade fixtures installed by the Lessee at its expense) at the termination of the tenancy in as good and tenable condition as the same are at the beginning of Lessee’s occupancy, reasonable wear and tear, damages by fire and other
casualties and condemnation appropriation by eminent domain excepted, and also excepting any damage, disrepair and other condition that the Lessor is obligated hereunder to repair and correct. 
  

TAXES 
  
 14.  All taxes, assessments and
charges on land or improvements and obligations secured by mortgage or other lien upon the demises premises of the shopping center shall be promptly paid by the Lessor when due. 
  
 BENEFITS 
  
 15.  This lease and all covenants and
provisions thereof shall inure to the benefit of and be binding upon the heirs, legal representatives, successor, and assigns of the parties hereto. Each provision hereof shall be deemed both a covenant and a condition and shall run with the land.

  
 HVAC REPAIRS 
  
 16.  Lessor will have the heating, ventilating and air conditioning systems serviced and put in first class operating condition upon the signing of this lease. Lessee will assume responsibility for any routine
maintenance and repairs and agrees to provide and insure regular routine maintenance to the units by securing a maintenance contract with a qualified HVAC contractor. However, Lessor agrees to accept responsibility for repair or replacement of units
in excess of $250.00 per occurrence during the lease term provided Lessee has maintained units on a regular basis. 
  
 DAMAGE BY FIRE OR
CASUALTY 
  
 17.  During the term of this lease Lessor agrees to carry standard form “All
Risk” property insurance on the building wherein the premises are situated for full replacement thereof and shall provide Lessee with a certificate of insurance reflecting such coverage, if requested. 
  
 If premises or a portion thereof shall be destroyed or injured by any cause and such destruction or injury could reasonably be repaired
within 90 days thereafter, Lessor shall with diligence undertake and substantially complete repairs within 90 days after the happening of such destruction or injury. If Lessee shall be deprived of the occupancy of any portion of the premises due to
any destruction or injury but can nevertheless continue to engage in its regular business, a rental abatement shall by allowed in proporation to the area rendered untenantable and continuing until premises are restored. No rent shall be payable
during any period that Lessee is unable to engage in its regular business. 
  
 If the destruction or injury cannot
reasonably be repaired within 90 days after the happening thereof, Lessor shall notify Lessee within 30 days after the happening of such destruction or injury whether or not Lessor will repair or rebuild. If Lessor elects not to repair or rebuild,
this lease shall be terminated. If Lessor shall elect to repair or rebuild, Lessor shall specify the time within which repairs or reconstruction will be completed and Lessee shall have the option within 30 days after the receipt of such notice to
elect either to terminate this lease and further liability thereunder or to extend the term or renewal term of this lease by a period of time equivalent to the period from the happening of such destruction or injury until the premises are restored
to their former condition. In the event Lessee elects to extend the term of the lease, Lessor shall restore the premises to their former condition within the time specified in the notice and Lessee shall be entitled to an abatement of rent in the
manner hereinbefore described. 
  
 WAIVER OF SUBROGATION 
  
 18.  Lessor and Lessee agree (to the extent that such agreement does not invalidate coverage under any policy of insurance) that, in the event the demised
premises, or any part thereof, are damaged or destroyed by fire or other casualty that is covered by insurance of the Lessor or Lessee, or the sub-lessee’s assignees or transferees or Lessee, the rights of any party against the other or against
the employees, agents or licensee of any party, with respect to such damage or destruction and with respect to any loss resulting therefrom, including the interruption of the business of any parties, are hereby waived to the extent of the coverage
of said insurance. Lessor and Lessee further agree that all policies of fire, extended coverage, business interruption and other insurance covering the demised premises or the contents therein shall, if possible, provide that the insurance shall not
be impaired if the insureds have waived their rights of recovery from any person or persons prior to the date and time of loss or damage. Any additions premiums for such clause or endorsement shall be paid by the primary insured. 

 

  
  
 EARLY TERMINATION

  
 19.  Lessee may terminate this lease after three years from the commencement date if Lessee’s
business has outgrown the demised premises or if Lessee wishes to relocate for any reason. Lessee may terminate this lease before three years from the commencement date provided Lessee offers Lessor a reasonable opportunity to relocate Lessee in the
Patrick Henry Mall or in one of the other Stone affiliated properties. 
  
 COMPLETE AGREEMENT 
  
 20.  This written lease contains the complete agreement of the parties to the leasing of the demised premises. No waiver or any
breach of covenant herein shall be construed as a waiver of the covenant itself or any subsequent breach thereof. 
  
 IN WITNESS WHEREOF, the Lessor and Lessee have executed this agreement the day and year first above written. 
  
 Signed, sealed and delivered in the presence of 
  
  
  
 
	  	    	 R. C. REALTY CORP.
 
	  	    	  
	 
	 
	    	 
	  	  
	 SECRETARY
 	    	 PRESIDENT
 
	 
	  	    	 MAINSTREET BANKSHARES, INC.
 
	  	    	  	  	  
	 
	 
	    	 
	  	  
	 SECRETARY
 	    	 CECIL R. McCULLAR
 PRESIDENT/CHIEF EXECUTIVE OFFICER

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