Exhibit 10.21

CONSULTING/SUPPLEMENTAL RETIREMENT/DEATH BENEFITS

AGREEMENT

THIS AGREEMENT (the Agreement) is entered into as of the 24thday of September, 1986, by and between Post, Buckley, Shuh & Jernigan, Inc., the PBSJ Corporation, Florida corporations with principal offices in Miami, Florida (together hereinafter referred
to as the Corporation), Phillip E. Searcy, 5436 N. Dean Road, Orlando, Florida 32817 (hereinafter referred to as the Employee).

WHEREAS, the Corporation is engaged in the business of rendering engineering services, including consulting, planning and surveying as well as allied professional services; and

WHEREAS, the Employee has been employed continuously by the Corporation since December 1, 1972, has served as an officer and director for many years and has been instrumental in the development, expansion and
success of the business of the Corporation; and

WHEREAS, the Corporation, through its Board of Directors, recognized that the future services of the
Employee will be of great value to the Corporation; and

WHEREAS, the Employee is willing to continue in thye employ of the Corporation on a full-time
basis for the period specified in this Agreement and on the terms and conditions herein set forth; and

WHEREAS, the Corporation and the Employee desire to
replace that certain employment agreement between the Corporation and the Employee, dated May 30, 1985, as amended, with this Agreement; and

WHEREAS,
the Corporation desires to provide to the Employee the additional retirement, disability and death benefits specified in this Agreement.

NOW, THEREFORE,
in consideration of the mutual covenants herein contained, the parties hereto agree as follows:



| | 1. | Employment.
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| | (a) | The Corporation agrees to employ the Employee and the Employee agrees to serve the Corporation, during the employment term specified in paragraph 2 hereof in an executive capacity
similar to his past and present activities for the Corporation, with such additional duties as may be reasonably assigned to him from time to time by the Board of Directors of the Corporation.
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| | (b) | During the employment term specified in paragraph 2 hereof, the Employee shall treat with strict confidentiality the business affairs of the Corporation and its subsidiaries and
affiliates and shall devote his entire time and attention exclusively to the business of the Corporation. Notwithstanding the foregoing, the Employee may invest his assets in any form or manner as will not require any services on his part in the
associations in which such investments are made. In addition, the Employee may serve as a director of or advisor to any company, corporation, partnership or association which is unrelated to the Corporation, provided such service is approved in
advance by the Board of Directors of the Corporation. If the Employee is elected or appointed as an officer or director of the Corporation during the employment term specified in paragraph 2 hereof, he shall serve in said capacity or capacities
without additional compensation. The Employee will not be required to perform any services hereunder which will necessitate moving his residence from Orlando, Florida, unless he agrees, in writing, to such relocation.
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| | 2. | Employment Term. The term of employment of the Employee hereunder shall commence on the date of execution of this Agreement, and shall continue until January 1, 1996 nor
until terminated in accordance with this Agreement. Upon mutual written agreement of the Employee and the Corporation, the employment term specified in this paragraph 2 may be shortened or extended for additional periods on the terms, provisions and
conditions set forth herein or as otherwise mutually acceptable to the Corporation and the Employee.
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| | 3. | Employment Compensation. The Corporation shall pay to the Employee during the term of employment specified in paragraph 2 hereof, as salary for his services, the amount of
One Hundred Fifty Thousand Dollars ($150,000) per annum. Such employment compensation shall be payable as prescribed by the Corporations regular payroll system but in no event less often than in equal monthly installments. The employment
compensation amount specified in this paragraph 3 may be adjusted by mutual consent of the Corporation and the Employee, and any such adjustment shall operate as an automatic amendment of said employment compensation amount.
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| | 4. | Consulting. The Corporation acknowledges the valuable business asset represented by the experience and judgment of the Employee as it has evolved and continues to mature
during the period of the Employees association with the Corporation. The Corporation desires to secure the continued availability of this business acumen as a corporate asset beyond the period of employment specified in paragraph 2.
Accordingly, in order to preserve this asset to the Corporation, the Employee shall remain reasonably available to serve the Corporation as a consultant or advisor for a period of fifteen (15) years commencing on the date of termination of the
Employees active and daily employment with the Corporation. During each such year of availability, Employee agrees to serve as a consultant or advisor to the Corporation for a period of up to forty-five (45) days upon request by the
Corporation and subject to the conditions specified below. The performance of advisory and consulting services to and for the Corporation, as provided in this paragraph 4, shall be subject to the following conditions:
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| | (a) | The employee shall not be required to render consulting or advisory services during vacation periods or during periods of personal or family illness or other incapacity.
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| | (b) | To the extent such services are not reasonably required to be performed at a particular location, they may be performed at such place or places as the Employee may designate from
time to time.
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| | (c) | The Employee shall be entitled to designate up to three one-month periods (which may or may not be consecutive) during which he shall not be required to render consulting or
advisory services.
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| | (d) | The Employee shall be entitled to at least ten (10) business days notice prior to the commencement of any proposed consulting or advisory assignment.
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| | (e) | The Employee shall be subject to the same confidentiality requirements as a consultant or advisor as he was during the term of his employment.
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| | 5. | Consulting Compensation. In consideration of his availability as a consultant or advisor to the Corporation during the period specified in paragraph 4, Employee shall receive
the amount of Thirty-Seven Thousand Five Hundred Dollars ($37,500) per year (the Consulting Retainer). The annual Consulting Retainer shall constitute payment to Employee for his availability and up to forty-five (45) days of actual
service to the Corporation as a consultant or advisor during any such year of availability. In the event the Corporation desires consulting or advisory services from Employee in addition to the aforementioned forty-five (45) days, such service
and the compensation therefore shall be subject to the mutual agreement of the Corporation and the Employee. The Consulting Retainer shall be paid whether or not Employee is requested by the Corporation to provide consulting or advisory services and
shall be payable in a manner consistent with the Corporations regular payroll system but in no event less often than in equal monthly installment. The amount of the Consulting Retainer payable under this Agreement shall be increased at the end
of each calendar year commencing with the year 1986 and ending with the year preceding the last year during which consulting payments are made under this Agreement by a percentage of such amount equal to the lesser of (1) three percent (3%), or
(2) the increase in the national Consumer Price Index (CPI) as published by the United States Government for such year. Adjustments shall be effective on January 1 based on the CPI for the prior year computed from December to
December. For the purposes of this Agreement, the CPI referred to shall be all items shown on the U.S. city average for urban wage earners and clerical workers (including single workers), all items, groups, subgroups and special groups of items as
promulgated by the Bureau of Labor Statistics of the U.S. Department of Labor. If the U.S. Department of Labor ceases to publish the above-described CPI, then such CPI as may be published by such Department most nearly approaching said discontinued
CPI shall be used in making the above adjustments. If the Department discontinues any such CPI, then such CPI as may be published by another U.S. Government agency, as most nearly approximated the CPI first above referred to, shall govern, subject
to the application of an appropriate conversion factor to be furnished by the governmental agency publishing the adopted CPI.
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| | 6. | Normal Retirement Supplemental Income.
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| | (a) | The employee is eligible for Normal Retirement from active and daily employment with the Corporation at any time after: (1) the expiration of that portion of
the initial employment term specified in paragraph 2 which ends on January 1, 1994, (2) he has completed ten (10) years of employment with the Corporation, and (3) he has been a party to this Agreement for five (5) years
from the date set forth above. The Employees disability as defined in paragraph 8 shall not prevent the satisfaction of this condition. In such event, Employee shall be deemed to have satisfied the foregoing condition as of January 1,
1994.
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| | Upon the Employees Normal Retirement from active and daily employment with the Corporation, the Corporation shall pay to the Employee supplemental
income in an amount determined under paragraph 10 hereof for a period of fifteen (15) years. Such supplemental income shall be payable in monthly installments on the first business day of each calendar month and shall commence on the first
business day of the first calendar month after the month of the Employees Normal Retirement from active and daily employment with the Corporation.
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| | (b) | If the Employee should die or become disabled after Normal Retirement but before receiving all 180 monthly payments hereunder, the Corporation shall continue to make monthly
payments to the Employee in the case of disability, or to Employees surviving designated beneficiary or beneficiaries, as specified in Exhibit A Attached hereto. Such payments shall be in an amount equal to twice the monthly amount paid or
payable as supplemental income pursuant to paragraph 10 and shall continue until the remaining monthly payments have been paid. If no beneficiaries have been designated, or if the designated beneficiaries have predeceased the Employee, or if the
beneficiaries cannot be found, such payments shall be made to the Employees estate for the remaining payment periods. If the Employees designated beneficiaries survive the Employee but thereafter die before all remaining payments have
been made, the Corporation shall continue to make the remaining monthly payments to the estate of the designated beneficiary last to die. In any event, the Corporation may at any time elect to substitute payment hereunder in the form of a lump-sum
amount having a present value actuarially equivalent to the total remaining supplemental income payments or a paid-up annuity having a value which shall produce the remaining monthly payments under this Agreement.
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| | 7. | Deferred Retirement Supplemental Income. If the Employee, with the approval of the Board of Directors of the Corporation, continues in active and daily employment with the
Corporation after he becomes eligible for Normal Retirement, the amount of supplemental income specified in paragraph 10 hereof shall be increased by the amounts set forth in Exhibit B for each full year that receipt of such supplemental income is
deferred and shall be paid commencing on the latter of the first business day of the first calendar month after the month in which the Employee actually retired from active and daily employment by the Corporation. Supplemental income under this
paragraph 7 shall be paid in the same manner as specified in paragraph 6 hereof during the Employees lifetime and after his death.
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| | 8. | Effect of Disability. The Employees employment with the Corporation shall be terminated if the Employee is prevented from performing his duties for a
continuous period of three (3) months by reason of any illness, incapacity or
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| | disability which may be medically determined in a manner to the reasonable satisfaction of the Board of Directors of the Corporation. Any such disability
shall automatically defer any supplemental income payments under this Agreement until the Employees sixty-fifth (65th) birthday unless Employee and the Corporation shall mutually agree otherwise.
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| | 9. | Death Benefits Prior to Retirement. If the Employee should die while employed by the Corporation but prior to becoming entitled to supplemental income under paragraph 6 or 7
hereof, the Corporation shall pay a death benefit equal to twice the amount of supplemental income specified in paragraph 10 hereof. Such death benefit shall be paid every year for fifteen (15) years, under the same terms and conditions as
specified in paragraph 6 hereof. Notwithstanding any other provision of this Agreement, no benefits shall be payable under this Agreement if the Employees death results from suicide, whether or not the Employee was sane or insane, within two
(2) years after the Employee became a party to this Agreement.
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| | 10. | Amount of Supplemental Income. The amount of supplemental income payable under this Agreement as of the date hereof shall be Thirty-Seven Thousand Five Hundred Dollars
($37,500) per year. The amount of supplemental income payable under this Agreement shall be increased at the end of each calendar year commencing with the year 1986 and ending with the year preceding the last year during which supplemental income
payments are made under this Agreement by a percentage of such amount equal to the lesser of (1) three percent (3%), or (2) the increase in the CPI as published by the United States Government for such year. Adjustments shall be made in
the manner described in paragraph 5.
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| | 11. | Termination of Employment.
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(a) If, at any time (except in the
event of a Change in Control as described below) (1) the Employee wishes to terminate his employment with the Corporation, or (2) the Corporation wishes to terminate the Employees employment with the Corporation because of a
determination by the Board of Directors of the Corporation that the Employee has failed to perform his duties in a reasonably satisfactory manner, then such party may so terminate the Employees employment with the Corporation by giving the
other party six (6) months prior written notice of such termination. In the case of the Employees failure to perform his employment duties in a manner reasonably satisfactory to the Board of Directors of the Corporation, the date of
termination of the Employees employment with the Corporation may be determined at the discretion of the Corporation. Upon the Employees termination of employment for cause by the Corporation under this paragraph 11, the Employee shall
forfeit all rights to receive the Consulting Retainer payments and supplemental income hereunder unless, as to supplemental income only, at the time of such termination he has satisfied the requirements of paragraph 6 hereof and has not forfeited
his rights hereunder pursuant to paragraphs 14 or 15 hereof.

b) The Employees employment with the Corporation shall not be deemed to
have been terminated because of the Employees absence from active and daily employment by reason of a bona fide temporary illness or disability (not exceeding a period of ninety (90) days), authorized vacation, temporary leave of absence
granted by



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the Corporation for reasons of professional advancement, education, health or government service, or military leave for any period required to be treated as
a leave of absence by virtue of any valid law or agreement.

c) Notwithstanding the foregoing, in the event of (i) a Change of Control
(as defined below) of the PBSJ Corporation or of Post, Buckley, Schuh & Jernigan, Inc. (PBSJ Inc.) and (ii) the termination of the Employees employment by the Corporation or any successor thereto for any reason other
than for Cause (as defined below), or the voluntary termination by the Employee of his employment hereunder for Good Reason (as defined below) at any time at least six months after the effective date of the Change in Control, all of the terms and
conditions of this Agreement shall remain in full force and effect, and shall be binding upon the Corporation, except that the Employee shall be deemed to have satisfied each of the conditions to eligibility for Normal Retirement set forth in
paragraph 6 (a) immediately prior to the effectiveness of any such Change in Control. In the event of a termination for Cause under this paragraph 11(c), the Corporation shall have no further obligation under this Agreement to make any payments
to, or bestow any benefits on, the Employee from and after the date of said termination, other than payments or benefits accrued for him (including deferred retirement benefits) prior to the date of said termination.

For purposes of this paragraph 11(c), a Change in Control shall be deemed to have taken place if:



| | (i) | any person (as such term is used in Section 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended, but excluding the Corporation, any of its subsidiaries, The PBSJ
Corporation Profit Sharing Trust and the PBSJ Corporation Employee Stock Ownership Plan and Trust), should acquire direct or indirect ownership of 80% or more of the voting power of the then outstanding securities of the PBSJ Corporation or PBSJ
Inc. by any means whatsoever; or
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| | (ii) | the shareholders of the PBSJ Corporation or PBSJ Inc. should approve any one of the following transactions:
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(x) the sale, lease, exchange or other transfer (in one transaction or a series of related transactions) of all, or substantially all, the assets of the
PBSJ Corporation or PBSJ Inc.; or

(y) any consolidation or merger of the PBSJ Corporation or PBSJ Inc. in which the PBSJ Corporation or
PBSJ Inc., as the case may be, is not the surviving corporation, other than a merger of the PBSJ Corporation, or PBSJ Inc. in which the holders of the common stock of the PBSJ Corporation or PBSJ Inc. immediately prior to the merger have the same
proportionate ownership of the surviving corporation immediately after the merger.



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For purposes of this paragraph 11(c), Cause shall mean (i) fraud or misappropriation
of corporate funds; or (ii) conviction of a felony involving moral turpitude and such conviction is no longer subject to direct appeal.

For purposes of this paragraph 11, Good Reason shall be deemed to exist under any of the following circumstances:



| | (i) | the Employee has been assigned any duties inconsistent with his position, duties, responsibilities and status with the Corporation immediately prior to the effective date of the
Change in Control (the Effective Date), or has been assigned reporting responsibilities, titles or offices of a lesser scope than those in effect immediately prior to the Effective Date, or he has been removed from, or not re-elected to,
any of such positions, except in connection with the termination of his employment for Cause;
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| | (ii) | the Corporation has reduced the Employees base salary as in effect immediately prior to the Effective Date or has failed to give him annual salary increases consistent with
performance review ratings as compared with other employees of the same or similar rank;
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| | (iii) | the Corporation has required the Employee to be based at any office or location other than that at which the Employee is based at the Effective Date, except for travel reasonably
required in the performance of the Employees responsibilities;
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| | (iv) | the Corporation has failed to comply with any provision of this Agreement.
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| | 12. | Prior Agreements.This Agreement supersedes and terminates in all respects that certain employment agreement executed by and between the Corporation and the Employee dated Ma
30, 1985, as amended.
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| | 13. | Working Facilities and Expenses. During the employment term specified in paragraph 2 hereof, the Employee shall be furnished with an office, stenographic and administrative
help, and such other facilities, services and assistance which shall be suitable to his position and adequate for the performance of his duties. In addition, during the employment term or any period of consulting or advisory service, the Corporation
shall reimburse the Employee for all reasonable expenses incurred by him for entertainment, travel, promotion and similar items in connection with the performance of his duties as undertaken, assigned or required.
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| | 14. | Reasons for Forfeiture.The Corporation shall stop payments to the Employee hereunder if the Employee is involved in fraud, or if the Corporation determines that the Employee
has been grossly negligent or has been engaged in willful misconduct in the course of his employment. Nothing contained in this Agreement shall in any way be construed to limit or otherwise waive the legal or equitable rights or remedies of the
Corporation to recoup monies paid hereunder to the Employee if the Corporation determines that it is entitled to such recoupment.
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Competition and Confidentiality.If, following retirement pursuant to paragraph 6 or 7, and through the period
until all payments have been made under this Agreement, the Employee competes with the Corporation, reveals to any third party any trade secrets or financial or other confidential information concerning the Corporation, does not perform required
services pursuant to paragraph 4 hereof, or is convicted of a felony, any supplemental income thereafter payable hereunder shall be forfeited. As used in this Agreement, compete shall mean entering into, performing or engaging, directly
or indirectly, in the rendering of engineering services or allied Professional services similar to those provided by the Corporation, including but not limited to consulting, planning and surveying, either as an individual for his own account, or as
a partner or joint venturer, or as an employee or agent for any person or as an officer, director, or shareholder of any business entity or otherwise, within the State of Florida, or any state in which the Corporation has an office or offices.

Employee acknowledges that his services under this Agreement are of a special, unique, unusual, extraordinary, and intellectual character, and that a
breach by Employee of this paragraph 15 could cause the Corporation irreparable injury and damage and would therefore cause a breach of this Agreement.



| | 16. | Insurance Benefits. As additional compensation to the employee for services performed, after the Employees retirement from active and daily employment with the
Corporation, the Corporation shall continue to pay for and provide to the Employee and his wife major medical and hospitalization insurance benefits of equal coverage and substantially similar to those major medical and hospitalization insurance
benefits paid for and provided to senior executives of the Corporation, provided, however, that such insurance shall not provide coverage or benefits substantially less valuable or protective now in effect for the Employee. Said insurance benefits
shall be paid for and provided to the Employee and his wife for so long as either of them shall live. Notwithstanding the fact that said period of coverage extends beyond the period specified in paragraphs, 4, 6, and 7 of this Agreement, the
Corporation and the Employee hereby agree that said lifetime insurance coverage is in the nature of supplemental income to the Employee, without any further or additional services from the Employee to the Corporation. The payment for and furnishing
to the Employee of said lifetime insurance benefits by the Corporation is subject to and conditioned upon the Employees compliance with the terms and conditions of this Agreement.
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| | 17. | Assignment. Neither the Employee nor any designated beneficiary, nor any other payee under this Agreement, shall have any power to transfer, assign, anticipate, hypothecate
or otherwise encumber in advance any of the supplemental income payable hereunder, nor shall any supplemental income payable be subject to seizure for the payment of any debts or judgments of the Employee or any payee or be transferable by the
Employee or any payee by operation of law in the event of such persons bankruptcy, insolvency or otherwise.
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| | 18. | Participation in Other Employee Benefit Plans. Any retirement or disability compensation payable under this Agreement shall not be deemed salary or other
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| | compensation to the Employee for the purpose of computing benefits to which he may be entitled under any pension plan or other arrangement of the Corporation
for the benefit of its employees. Nothing contained herein shall in any manner modify, impair or affect the existing or future right or interest of the Employee to receive any employee benefits to which he would otherwise be entitled, or as a
participant in any future incentive profit-sharing or bonus plan, stock option plan or pension plan of the Corporation, applicable generally to salaried employees. The rights and interests of the Employee to any employee benefits or as a participant
or beneficiary in or under any or all such plans shall continue in full force and effect unimpaired, and the Employee shall have the right at any time hereafter to become a participant or beneficiary under or pursuant to any and all such plans.
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| | 19. | Arbitration. Any controversy or claim arising out of or relating to this Agreement, or the breach thereof, shall be settled by arbitration conducted by and in accordance with
the rules then in existence of the American Arbitration Association. Judgment upon the award rendered by the arbitrators may be entered in any court having jurisdiction thereof.
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| | 20. | Life Insurance and Funding.
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(a) The Corporation,
in its sole discretion, may apply for and procure as owner and for its own benefit insurance on the life of the Employee in such amounts and in such forms as the Corporation may choose. The Employee shall have no interest whatsoever in any such
policy or policies, but, at the request of the Corporation, shall submit to medical examinations and supply such information and execute such documents as may be required by the insurance company or companies to which the Corporation has applied for
insurance.

(b) The supplemental income provided here in shall constitute an unfunded promise of the Corporation, and the benefits and
rights of the Employee or his beneficiary or estate to supplemental income under this Agreement shall be solely those of an unsecured creditor of the Corporation. Any insurance policy or other assets acquired or held by the Corporation in connection
with the liabilities assumed by its pursuant to this Agreement shall not be deemed to be held under any trust for the benefit of the Employee of his estate or a beneficiary thereof or to be security for the performance of the obligations of the
Corporation but shall be and remain a general, unpledged and unrestricted asset of the Corporation.

21. Professional Liability
Coverage. The Corporation shall provide coverage to and for the Employee, as a named insured, under any Architects/Engineers Professional Liability Insurance policy maintained by the Corporation. Said coverage provided to the Employee shall be
coextensive with coverage to the Corporation both as to amount and description of services covered. The term and length of coverage under said policy shall extend to liability as a result of services performed by the Employee pursuant to this
Agreement.

22. Governing Law. This Agreement shall be construed in accordance with and governed by the laws of the State of Florida
(without regard to the conflicts of laws thereof). All lawsuits and other proceedings related to this Agreement or the transactions herein described shall be commenced and held in Dade County, Florida and the Employee waives all rights to object to
the laying of venue in such jurisdiction. In the



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event of any litigation or arbitration arising by virtue of this Agreement, the prevailing party shall be entitled to an award of all court costs, litigation
and arbitration expenses and attorneys fees at both trial and appellate levels.

23. Notices. Any notice, payment, demand or
communication required or permitted to be given by any provision of this Agreement shall be in writing and shall be deemed to have been delivered and given for all purposes, if delivered personally to the party or to an officer of the party to whom
the same is directed, or, whether or not the same is actually received, if sent by registered or certified mail, postage and charges prepaid, properly addressed to the addressees last known address.

24. Claims Procedure. In the event Employee (or Beneficiary) does not receive a distribution of benefits to which he or she is entitled, he or she
may present a claim to the Board of Directors of the Corporation. The claim for benefits must be in writing and addressed to the Corporation. If the claim for benefits is denied, the Corporation shall notify the Employee (or Beneficiary) of the
basis for the denial, any additional material or information necessary for the Employee (or Beneficiary) to perfect his or her claim, and the steps which the Employee (or Beneficiary) must take to have the claim for benefits reviewed.

If a claim for benefits has been denied, Employee (or Beneficiary) may file a written request for a review of his or her claim by the Board of Directors.
The decision of the Board of Directors shall be made within sixty (60) days after receipt of a request for review and shall be communicated in writing to the claimant. Such written notice shall set forth the basis for the Board of
Directors decision shall be rendered not later than one hundred twenty (120) days after receipt of a request for a review.

25.
Integrated Agreement. This Agreement constitutes the entire understanding and agreement among the parties hereto with respect to the subject matter hereof, and there are no agreements, understandings, restrictions, representations or
warranties among the parties other than those set forth herein.

26. No Oral Modification. No modification or waiver of this
Agreement or any part hereof shall be valid or effective unless in writing and signed by the party or parties sought to be charged therewith. No waiver of any breach or condition of this Agreement shall be deemed to be a waiver of any breach or
condition of this Agreement or of any subsequent breach or condition, whether of like or different nature.

27. Binding Effect. This
Agreement is binding upon and shall inure to the benefit of the Corporation, its representatives, successors and assigns, and to the Employee, heirs and personal representatives and his designated beneficiaries. The Corporation and the Employee
agree to execute any instruments and to perform any acts which are or may become necessary to effectuate this Agreement and to fulfill its terms.

28. Paragraph Captions. Paragraph and other captions contained in this Agreement are for reference purposes only and are in no way intended to describe, interpret, define or limit the scope, extent or intent of this Agreement or any
provision hereof.

IN WITNESS WHEREOF, the respective Corporation has caused this Agreement to be executed by its duly authorized officer and the Employee
has hereunto set his hand and seal as of the date first above written.



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|               |  |           |  |           |  |     |  |                                      
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|               |  |           |  |           |  |     |  | POST, BUCKLEY, SCHUH & JERNIGAN, INC.
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|By             |  |           |  |           |  | By  |  |                                      
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|               |  | Secretary |  |           |  |     |  |                                      
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|mw/k/glass.002 |  |           |  |           |  |    
|15.            |  | 1/12/88   |  |           |  |     |  |                                      
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