Document:

Exhibit 10.21

Accident Prevention Plus, Inc.
325 Wireless Boulevard Hauppauge, New York l1788
631.360.0600 Fax: 631-265.3351 E-mail: appinc@mindspring.com

                              DISTRIBUTOR AGREEMENT
                                      DATE:

This is an Agreement between Accident Prevention Plus, Inc. ("APP"), and
INTELLISERVICES. S.A. DE C.V. Av. La. Fragua 314, Col. Centro C.p. 91700.
Veracruz, Ver. (Distributor)

It is agreed that Distributor is appointed THE EXCLUSIVE DISTRIBUTOR for the
sale of Accident Prevention Plus, Inc. (APP) products in ____Mexico_________, as
same is presently constituted, is herein referred to as the "Territory") as set
forth in the current APP Distributor Cost Scbedule, as revised by APP from time
to time. This appointment is governed by the following terms:

l.   DISTRIBUTOR SALES EFFORTS

At Distributor's expense, Distributor shall (1) take an active part in APP's
sales programs; (2) participate in distributor product training courses; (3)
maintain adequate facilities to assure the prompt handling of all business
generated under tbis Agreement; (4) carry a representative inventory of APP
products to assure adequate and timely delivery.

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2.   APP SALES EFFORTS

APP will furnish Distributor without charge a reasonable supply of price lists,
sales literature, books, catalogs, etc. as APP may prepare for national
distribution, in English and Spanish, and shall also provide Distributor with
such technical and sales assistance as may be necessary to assist Distributor in
effectively carrying out it's activities under this agreement. APP shall use
reasonable efforts to fill all orders issued by Distributor hereunder, but shall
not be obligated to accept Distributors orders and upon acceptance thereof,
shall not be liable for delay or failure to make any shipment or delivery.
Within the Territory APP will sell APP products only to Distributor and will
take all reasonable steps to ensure that APP customers outside of the Territory
do not resell APP products into the Territory.

3.   TERMS AND CONDITIONS 0F SALE

The prices for all products shall be as negotiated between APP and Distributor,
revised from time to time by APP and Distributor and as in effect at the time of
shipment. Such initial price list is attached. The minimum order quantities
shall be APP standard minimums as established from time to time and as in effect
at the time Distributor' s orders are acknowledged. Terms of payment shall be 1%
20 days net 30days in U.S.D.,subject to credit approval, payable to Accident
Prevention Plus Inc. No other terms and conditions shall be applicable.

4.   RELATIONSHIP 0F THE PARTIES AND WARRANTIES

A.   Distributor Is an independent contractor and in no way an agent of APP, it
     being expressly agreed that the only relationship created by this Agreement
     is that of vendor and vendee. Distributor agrees not to make any
     representation, promise, guarantee, or warrant on APP's behalf. Distributor
     further agrees that it has no authority to assume or create any obligation
     on APP's behalf, expressed or implied regarding APP products or otherwise.
     APP's only warranty obligation covering products sold by it to Distributor
     shall be as set forth in APP's standard printed warranty as applicable to
     the particular product. NO WARRANTY 0F SUITABILITY FOR A PARTICULAR PURPOSE
     OR ANY OTHER WARRANTY EXPRESSED STATUTORY OR IMPLIED, SHALL APPLY TO THE
     PRODUCTS. In no event shall APP be liable for damages by reason of failure
     of any product to function properly (beyond its liability in law) or for
     consequential or special damages.

B.   In connection with the sales promotion or advertising of APP products,
     Distributor shall use the name and type number designated by APP for each
     such product. Distributor shall not in any way alter APP's labels or other
     identifying marks on its products. Distributor further agrees not to use
     the name "APP Devices" or any name similar which may in any way result in
     confusion or lead a third party to believe that .APP and the Distributor
     are not separate and distinct entities.

<PAGE>

C.   Distributor will provide APP on request with a list of the Distributor's
     customers using APP products and will permit APP to have access to its
     sales records for the purpose of determining same. Distributor will provide
     APP on request with a list of products in Distributor's inventory as of the
     first day of such month or will permit a designated representative of APP
     to review such inventory

5.   PRICE CHANGES

In the event of a reduction in the price of products, APP shall grant to
Distributor a credit with respect to products then in Distributor's inventory
and products in transit equal to the difference between the lowest price for
that product in effect immediately preceding such reduction and the new lowest
price for that product, multiplied by the quantity of each such product. Back
orders will also be re-priced accordingly. APP will also give Distributor the
same price protection with respect to products in the inventories of
Distributor' s customer, if and to the extent that Distributor is required to
give such price protection to its customers. The Distributor will furnish APP
with such information to enable APP to determine the amount of such prices as
APP may reasonably request and shall permit APP TO HAVE ACCESS TO ITS PLACE 0F
BUSINESS AND ITS BOOKS AND RECORDS IN ORDER TO VERIFY SAME. Inventory reports
from the Distributor for the issuance of price credits shall be received by APP
within fifteen (15) days after the effective date of the price changes. NO SUCH
CREDIT WILL BE DUE DISTRIBUTOR IF DISTRIBUTOR FAILS TO FURNISH SUCH INVENTORY
REPORT WITHIN SAID TIME.

6.   RETURNS

The following products may be returned under the following prescribed
conditions:

A.   New Products. A "New Product" for the purpose of this Agreement shall be a
     Product that is newly introduced by APP to the market and designated by APP
     as "'NEW PRODUCT". Such product shall be and remain a New Product for the
     purposes of this paragraph 6(a) for a period of six (6) months from the
     date of the first shipment of such product to the Distributor, provided
     Distributor has ordered the original shiprnent quantity of such product
     within thirty (30) days from the date o fAPP's notification to Distributor
     of Distributor's original shipment quantity thereor.

Within thirty (30) days from the date of expiration of the 6-month period
established above, Distributor will be permitted to return for credit that
quantity of a New Product having a dollar amount (based upon the Distributor
Cost Schedule in effect as of the date of return, for the original order
quantity level of such New Product) no more than the original invoice price for
the original order quantity. New Products purchased after the expiration of the
initial 12-month period, and New Products, whenever purchased, which Distributor
desires to retur subsequent to the end of the 30-day period following the
expiration of the initial 12-month period, will be considered for return
conditions for other products as set forth below.

<PAGE>

B.   Regular Products. Distributor may return for credit a quantity of products
     the value of which does not exceed five (5%) percent of the net sales
     invoiced Distributor for products shipped to Distributor within a six (6)
     month period immediately preceding notification dates by APP. All returned
     products will be credited at Distributor' s actual purchase price or the
     lowest price set forth in the Distributor' s Cost Schedule in effect on the
     day of return, whichever is less.

At the end of each (12) month period the Distributor shall be so notified and
shall have thirty (30) days from the day of such notification to make such
return. This return privilege shall apply only if:

     1.   The returned products were shipped from APP less than eighteen (18)
          months prior to date of such notification.

     2.   The returned products have not been damaged, altered or misused.

     3.   The returned products have been approved by APP for Distributor
          stocking.

     4.   At the time of this return, Distributor must order a quantity of
          products the dollar value of which equals the dollar value of the
          products returned.

     5.   All returns must be within the time periods specified above.

C.   Return Authorization. All products hereunder must be shipped prepaid and
     accompanied by APP's standard return material authorization form.
     Distributor agrees to furnish APP, upon written request, a detailed
     inventory report in a form acceptable to APP, as requested from time to
     time.

7.   MERCHANDISING PROGRAM

A.   APP and Distributor shall undertake a cooperative merchandising program
     pursuant to which Distributor shall spend Two percent (2%) of Distributor'
     s purchases from APP in each year of the term of this Agreement. In order
     to fund such program, Distributor shall be entitled to a One percent (1%)
     discount on all purchases from APP and Distributor shall itself pay an
     equal amount for such program. On an annual basis, Distributor shall
     provide APP with an accounting of the expenditures for such cooperative
     merchandising program.

8.   TERMINATION AND CANCELLATION

This Agreement shall be in effect upon the date thereof and shall expire on
October 2, 2001, subject to the provisions hereinafter set forth. APP may
terminate this Agreement in the event the Distributor breaches any term hereof,
the branch of which is materially adverse to APP, on notice which shall become
effective twenty (20) business days from the date given if such breach is not
sooner corrected by Distributor shall be, or become, insolvent, or if the
Distributor makes an assignment for the benefit of creditors or there is
instituted a voluntary or involuntary proceeding in bankruptcy seeking to have
the Distributor declared bankrupt, or proceedings are instituted against
Distributor under the insolvency laws or for reorganization or receivership or
dissolution.

<PAGE>

9.   GOVERNING LAWS

This Agreement and its validity shall be governed by, subject to, and construed
in accordance with the laws of the State of New York.

10.  WAlVER

The failure of APP to enforce at any time or for any period of time the
provisions hereof of the failure of APP to exercise any options herein shall not
be construed as a waiver of such provision or option, and shall in no way affect
APP' s right to later effect such provision or exercise such option.

11.  ASSIGNMENT

The Distributor may not assign this Agreement without APP' s prior written
consent executed in the same manner as this Agreement.

12.  INTEGRATION

This Agreement cancels and supersedes any previous understanding or agreements
between the parties relating to the subject matter, hereunder, including any
existing distributorship agreement. This Agreement expresses the complete and
final understanding of the parties with respect to the subject matter hereunder
and may not be changed in any way expect by an instrument in writing-signed by
both parties in the same manner as this Agreement.

13.  NOTICE

Any notice required to be given hereunder shall be given by e-mail, fax or
overnight courier delivery and shall be deemed to have been received on the date
of actual receipt thereof, if delivered by courier or on the date of
transmission thereof, if delivered by fax.

<PAGE>

14.  WARRANTY APP shall provide a full exchange warranty for APP products for
     for a one (1) year period after sale to Distributor's customers on the
     basis that during such one (1) year period, any product returned to
     Distributor as defective be accepted by APP when delivered to APP and full
     credit be given thereof by APP to Distributor.

15.  CONFIDENTIALITY

During the term of this Agreement, neither party shall disclose to any firm or
person confidential or proprietary information furnished by the other to it,
including but not limited to unannounced products, figures on volume of sales,
revenues, factory costs, and technology of every sort. When doubt exists as to
the confidentiality of any information it is the responsibility of the recipient
to obtain permission from the disclosing party in writing prior to any
disclosure. Upon termination of this Agreement or upon request by APP,
Distributor shall return to APP originals and all copies o fall customer lists,
brochures, catalogs, price lists, advertising materials and all other documents
related to the sales of products furnished by APP. This duty of confidentiality
shall survive termination of this Agreement.

16.  BILL TO & SHIPPING LOCATIONS

Bill To:

Ship Locations:

<PAGE>

Distributor:                              Manufacturer :
                                          Accident Prevention Plus, Inc.

/s/ Arturo C. Wenzel Gonzales             /s/ George Rishfield
-----------------------------             ---------------------
Authorized Signature                      Authorized Signature

Director General                          Exec. Vice President of Sales
----------------                          -----------------------------
Title                                     Title

Arturo C. Wenzel Gonzales                 George Rishfield
-------------------------                 ----------------
Authorized name (Type or Print)           Authorized name (Type or Print)

January 9, 2001                           January 9, 2001
---------------                           ---------------
Date                                      DateExhibit 10.1(b)
                                                                 ---------------

                               AMENDMENT NO. 1 TO
                           PURCHASE AND SALE AGREEMENT

     This Amendment No. 1 to Purchase And Sale Agreement (the "Amendment") is
entered into on this 16th day of May, 2001 between and among Sheridan
Investments, LLC (the "Seller"), a Colorado limited liability company, Sheridan
Plaza at Inverness, LLC ("Plaza"), a Colorado limited liability company,
AmeriVest Properties, Inc. ("AmeriVest"), a Maryland corporation, and AmeriVest
Inverness Inc. ("Purchaser"), a Colorado corporation. For purposes of this
Amendment, each of Seller, Plaza, AmeriVest and Purchaser may be referred to
individually as a "Party" and all of Seller, Plaza, AmeriVest and Purchaser may
be referred to collectively as the "Parties".

                                    Recitals
                                    --------

     A. The Parties entered into a Purchase And Sale Agreement dated April 30,
2001 to be effective as of the 1st day of April, 2001 (the "Effective Date")
pursuant to which Purchaser agreed to purchase from Seller, and Seller agreed to
sell to Purchaser, a 100 percent preferred limited liability company membership
interest in Plaza (the "Plaza Interest").

     B. Subsequent to entering into the Purchase And Sale Agreement, AmeriVest's
Giltedge Office Building, Inc. subsidiary ("Giltedge") entered into an agreement
to sell the office building owned by Giltedge in Appleton, Wisconsin (the
"Giltedge Building").

     C. The Parties desire to amend the Purchase And Sale Agreement to provide
for the payment of the Purchase Price in such a manner that AmeriVest may pay a
portion of the purchase price in cash, including the possibility that AmeriVest
could utilize the proceeds from the sale of the Giltedge Building to pay a
portion of the Purchase Price for the Plaza Interest in an exchange transaction
pursuant to Section 1031 of the Internal Revenue Code of 1986, as amended (the
"Code").

                                    Agreement
                                    ---------

     In consideration of the premises and of the mutual covenants contained in
this Amendment, the Parties agree as follows:

     1. Amendment to Section 1.2. Section 1.2 of the Purchase And Sale Agreement
shall be amended to read in its entirety as follows:

          "1.2 Purchase Price. The purchase price (the "Purchase Price") for the
     Plaza Interest shall be the "Net Equity Value Of Plaza" (defined as the
     fair market value of the balance sheet of Plaza as of March 31, 2001, set
     forth in Exhibit B) which equals $6,928,646, payable at "Closing"
     (hereinafter defined) as follows: (a) Seller shall redeem Purchaser's LLC
     Interest for an amount equal to 9.639 percent of the "Net Equity Value Of
     Seller" (defined as the fair market value of the balance sheet of Seller as
     of March 31, 2001, set forth in Exhibit C) which equals $705,934; (b) at
     AmeriVest's and Purchaser's election, AmeriVest or Purchaser may pay up to
     $492,000 in cash, provided however that if AmeriVest determines to utilize
     the proceeds from the sale of the office building (the "Giltedge Building")
     owned by AmeriVest's Giltedge Office Building, Inc. subsidiary ("Giltedge")
     in an exchange under Section 1031 of the Internal Revenue Code of 1986, as
     amended (the "Code"), AmeriVest and/or Purchaser may pay a higher amount in
     cash equal to the full amount of the net cash received from the sale of the
     Giltedge Building in payment of the cash portion of the Purchase Price; and
     (c) AmeriVest shall deliver the balance of the Purchase Price in the form
     of shares of the restricted common stock (the "Common Stock") of AmeriVest
     at the rate of $5.55 per share (the "AmeriVest Shares"). Seller will hold

<PAGE>

     the AmeriVest Shares for at least one year from the "Closing Date"
     (hereafter defined) prior to making any transfers of AmeriVest Shares.
     Commencing upon the first anniversary of the Closing Date, not more than 50
     percent of the AmeriVest Shares may be transferred to Seller's members at
     the discretion of Sheridan Development, LLC, Seller's sole Manager
     ("Sheridan Development"). Commencing on the second anniversary of the
     Closing Date and at any time or times to anyone thereafter, all or some
     portion or portions of the remaining AmeriVest Shares held by Seller may be
     transferred at Sheridan Development's discretion. All such transfers of the
     AmeriVest Shares by Seller shall be in compliance with all applicable
     federal and state securities law registration requirements or exemptions
     therefrom."

     2. Amendment Of Section 8.2.1. Section 8.2.1 of the Purchase And Sale
Agreement shall be amended to read in its entirety as follows:

          "8.2.1. Payment of the Purchase Price by (a) conveying the LLC
     Interest, to be redeemed by Seller by execution of an Assignment and
     Assumption Agreement in the form attached hereto as Exhibit I; (b)
     delivering any portion of the Purchase Price that AmeriVest and/or
     Purchaser determines to pay in cash pursuant to Section 1.2 of this
     Agreement; and (c) delivering a certificate (the "Certificate"), issued in
     the name of Seller, representing the number of AmeriVest Shares determined
     in accordance with Section 1.2 of this Agreement."

     3. No Other Amendments; Conflicts. Except as specifically set forth in this
Amendment, no other provisions of the Purchase And Sale Agreement shall be
amended. In the event of an irreconcilable conflict between the Purchase And
Sale Agreement and this Amendment, the provisions of this Amendment shall
control.

     IN WITNESS WHEREOF, this Amendment is executed on May 15, 2001 to be
effective as of the Effective Date.

SHERIDAN INVESTMENTS, LLC,                      AMERIVEST INVERNESS INC.,
  a Colorado limited liability company            a Colorado corporation

By:  Sheridan Development, LLC,
      a Colorado limited liability company,     By:   /s/ Charles K. Knight
                                                    ----------------------------
      Manager                                       Charles K. Knight, President

By:    /s/ William T. Atkins
      ----------------------------------
      William T. Atkins, Manager

By:    /s/ Alexander S. Hewitt
      ----------------------------------
      Alexander S. Hewitt, Manager

SHERIDAN PLAZA AT INVERNESS, LLC,               AMERIVEST PROPERTIES, INC.,
  a Colorado limited liability company            a Maryland corporation

By:  Sheridan Investments LLC,
     a Colorado limited liability company,      By: /s/ Charles K. Knight
                                                    ----------------------------
     Manager                                        Charles K. Knight, President

By:  Sheridan Development, LLC.,
     a Colorado limited liability company,
     Manager

By:  /s/ William T. Atkins
     -----------------------------------
     William T. Atkins, Manager

By:  /s/ Alexander S. Hewitt
     -----------------------------------
     Alexander S. Hewitt, Manager

                                    * * * * *

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