Document:

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                                                                EXHIBIT 10.20.11

                         FORM OF PERFORMANCE CRITERIA

                      (January 1, 1999-December 31, 1999)
            (as amended by the Compensation Committee on 12/08/99)

If the Company's actual net income from January 1, 1999 through December 31,
1999:

 .  exceeds budgeted net income by less than $100,000, the right to purchase
   20,000 shares of Common Stock under the Stock Option shall become immediate
   and the remaining shares of the Stock Option shall become vested on December
   31, 2005;

 .  does not exceed budgeted net income, all shares of Common Stock under the
   Stock Option shall become vested on December 31, 2005.<PAGE>

                                                              EXHIBIT 10.20.12

                         FORM OF PERFORMANCE CRITERIA

                      (January 1, 2000-December 31, 2000)
            (as adopted by the Compensation Committee on 12/08/99)

In the event that the Company's actual net income from January 1, 2000  through
December 31, 2000 exceeds the Company's budgeted net income, as described in the
attachment hereto, by at least $300,000, the Stock Option shall become
immediately vested and exercisable with respect to 25,000  shares of Common
Stock.  If the Company's actual net income during the period specified does not
exceed the Company's budgeted net income by at least $300,000, the Stock Option
shall vest immediately in part in accordance with the following schedule:

If the Company's actual net income for 2000:

 .  exceeds budgeted net income by $200,000 or more but less than $300,000, the
   right to purchase 20,000 shares of Common Stock under the Stock Option shall
   become immediate and the remaining shares of the Stock Option shall become
   vested on December 31, 2005;

 .  exceeds budgeted net income by $100,000 or more but less than $200,000, the
   right to purchase 15,000 shares of Common Stock under the Stock Option shall
   become immediate and the remaining shares of the Stock Option shall become
   vested on December 31, 2005;

 .  exceeds budgeted net income by less than $100,000, the right to purchase
   10,000 shares of Common Stock under the Stock Option shall become immediate
   and the remaining shares of the Stock Option shall become vested on December
   31, 2005;

 .  does not exceed budgeted net income, all shares of Common Stock under the
   Stock Option shall become vested on December 31, 2005.<PAGE>

                                                                 Exhibit 10.22.1

                           [SILVER DINER LETTERHEAD]

                                 March 4, 1999

Mr. Patrick Meskell
Silver Diner, Inc.
11806 Rockville Pike
Rockville, MD 20852

Dear Paddy:

When you came on board, we provided you with a letter dated December 4, 1995,
setting forth your employment terms and compensation. This letter takes the
place of the December 4, 1995, letter. Please signify your acceptance by signing
in the space provided at the end of this letter.

The specifics of our understanding are as follows:

1.  Salary - A base salary of $104,000 per annum, with annual adjustments in the
    future as approved by the Company's Compensation Committee or by the Board
    of Directors.

2.  Bonus and Stock Options - You will be entitled to participate in bonus and
    stock option plans as made available by the Company to its executives.

3.  Automobile - You will receive a $500.00 per month car allowance.

4.  Life Insurance - The Company will provide, at no cost to you, life insurance
    coverage in the amount of $500,000.00.

5.  Health/Dental Insurance - The Company will provide, at no cost to you and
    your family, group health and dental plans offered by the Company's
    employees generally.

6.  Disability Coverage - The Company will provide, at no cost to you, long term
    disability insurance coverage in an amount of approximately 60% of your base
    salary per month, with a 90 day waiting period during which time your base
    salary will continue to be paid by the Company.

7.  Vacation Days - Three weeks per year. Vacation does not accrue or carry over
    from one year to the next year.

8.  Sick Leave and Other Benefits - You will be entitled to sick leave and other
    benefits in accordance with the Company's policies for its executives.

                   11806 ROCKVILLE PIKE, ROCKVILLE, MD 20852
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DINER 301-770-4166          EXECUTIVE OFFICE 301-770-0333       FAX 301-770-2832
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Mr. Patrick Meskell
March 4, 1999
Page 2

9.  Compensation Coverage - If the Company terminates your employment for any
    reason, you will be paid all base salary earned by you and unpaid on the
    date of termination, plus three months base salary. If you resign, you will
    be paid all base salary earned by you and unpaid on the date of resignation,
    plus three months base salary, payable after resignation on the same
    schedule as your salary was paid before resignation, provided you have given
    the Company at least three months prior notice of your proposed resignation
    as an employee of the Company. If you resign as an employee of the Company
    and do not give at least three months prior notice, (a) all stock options to
    purchase stock of the Company and all common stock purchase rights granted
    to you by the Company subsequent to March 1, 1999, and all stock options
    granted to you on December 29, 1997, and on December 15, 1998, pursuant to
    the Plan known as the "Active Employee/Consultant Stock Option Plan" will be
    terminated on the date of your resignation and may not thereafter be
    exercised and (b) you will sell and the Company will purchase all common
    stock of the Company acquired by you pursuant to stock options or stock
    purchase rights within six (6) months prior to the date of such resignation
    at a purchase price equal to the price you paid for such common stock. All
    certificates for common stock of the Company acquired by you pursuant to the
    exercise of stock options or stock purchase rights will bear a legend
    describing the foregoing.

10. Confidentiality and Non-Competition - You will enter into Confidentiality
    and Non-Competition Agreements that all of the general managers have entered
    into in the form attached hereto as Exhibit A.

I am excited about our progress.

Sincerely,

SILVER DINER, INC.

by: /s/ Robert T. Giaimo
    --------------------
    Robert T. Giaimo
    President

AGREED AND ACCEPTED:

/s/ Patrick Meskell                        Date: 3/16/99
-------------------                              -------
Patrick Meskell
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                                                                      EXHIBIT A
                                                                      ---------

            [Form of Confidentiality and Non-Competition Agreement]

     1.  Confidential Information.

     Employee agrees that all Confidential Information (as defined below)
relating to Silver Diner, Inc., or to its business and affairs, including,
without limitation, any information whatsoever concerning its organization,
management, or finances, shall at all times, and notwithstanding that
termination of employment shall have occurred, be treated as confidential and
shall not be used, disclosed, divulged or otherwise placed at the disposal of
any person or entity except to the extent that (i) the parties hereto may
otherwise agree in writing, (ii) such information is required to be disclosed by
law, (iii) such information is otherwise publicly available other than by reason
of a breach by such party of this Section 1, or (iv) such information is
submitted into evidence in any legal proceedings between or among the parties.

     "Confidential Information" means all information, records, documents,
accounts and correspondence of every description regarding past, current or
future business activities, interests, methodology or affairs, whether written,
recorded or stored by electronic, magnetic, electro-magnetic or other form or
process or otherwise in machine or computer readable form, including, without
limitation:

         (a)  business plans, research, know-how, development and survey
              information,

         (b)  customer, staff, and all other training manuals and product policy
              manuals, recipes, and

         (c)  planning and marketing strategies, procedures, techniques and
              information.

     2.  Non-Competition.

     Employee agrees that during the period of time that he/she is providing
services hereunder and for a period ending on the first anniversary of any
termination of employment:

              (i)   Employee will not engage, without first obtaining Silver
Diner, Inc.'s prior written consent, directly or indirectly within 25 miles of a
then existing Silver Diner Restaurant, in any restaurant business (x) with the
word "Diner" in its name or logo or which is commonly understood to be a diner
or (y) whose menu, trade dress and pricing are substantially similar to that
employed in the Silver Diner Restaurants, whether as employee, officer,
director, partner, joint venturer, stockholder (other than the holder of less
than 5% of the stock of a corporation, the securities of which are traded on a
national securities exchange or in the over-the-counter market), consultant, or
agent.
<PAGE>

              (ii)  Employee will not engage, without first obtaining Silver
Diner, Inc.'s prior written consent, directly or indirectly, within the United
States, in any restaurant business with the word "Diner" in its name or logo or
which is commonly understood to be a diner, whether as employee, officer,
director, partner, joint venturer, stockholder (other than the holder of less
than 5% of the stock of a corporation, the securities of which are traded on a
national securities exchange or in the over-the-counter market), consultant, or
agent.

              (iii) Employee will not induce or attempt to persuade any employee
of Silver Diner, Inc. to terminate his or her employment relationship in order
to enter into employment which is competitive with Silver Diner, Inc.

              (iv)  It is the intent and understanding of each party hereto that
if, in any action before any court or agency legally empowered to enforce the
covenants contained in this Section 2, any term, restriction, covenant or
promise contained therein is found to be unreasonable and for that reason
unenforceable, then such term, restriction, covenant or promise shall be deemed
modified to the extent necessary to make it enforceable by such court or agency,
and such finding shall not, in any event, affect the enforceability of any other
term, restriction, covenant, or promise herein.

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