Document:

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                                                                  EXHIBIT 10.17

                        THIRD AMENDMENT TO LOAN AGREEMENT

         THIS THIRD AMENDMENT TO LOAN AGREEMENT ("Amendment") is made as of
March 31, 2000, by and between U.S. BANK NATIONAL ASSOCIATION, a national
banking association ("Lender") and QUALMARK CORPORATION, a Colorado corporation
("Borrower").

                                    RECITALS:

         A. Lender made a revolving loan to Borrower, as evidenced by that
certain Promissory Note dated December 22, 1998 made by Borrower payable to
Lender in the original principle amount of $3,000,000 (the "Original Revolving
Note"), as amended and supplemented by that certain Modification/Extension
Agreement effective as of August 23, 1999 between Lender and Borrower (the
"Amendment to Revolving Note"). Pursuant to the Amendment to Revolving Note, the
principal amount of the Original Revolving Note was reduced to $2,000,000. The
Original Revolving Note, as amended and supplemented by the Amendment to
Revolving Note, is hereinafter called the "Revolving Note".

         B. Lender made a term loan to Borrower, as evidenced by that certain
Promissory Note dated December 22, 1998 made by Borrower payable to Lender in
the original principle amount of $2,000,000 (the "Original Term Note"), as
amended and supplemented by that certain Modification/Extension Agreement
effective as of August 23, 1999 between Lender and Borrower (the Amendment to
Term Note"). Pursuant to the Amendment to Term Note, the principle amount of the
Original Term Note was reduced to $1,261,017.47. The Original Term Note, as
amended and supplemented by the Amendment to Term Note, is hereinafter called
the "Term Note."

         C. The Revolving Note and the Term Note (collectively, the "Notes") are
subject to the provisions of that certain Revolving Credit and Term Loan
Agreement dated as of December 22, 1998 between Borrower and Lender, as amended
by (i) a Waiver and Amendment to Loan Agreement dated as of March 15, 1999, and
(ii) a Second Amendment to Loan Agreement dated as of August 23, 1999 (as so
amended, the "Loan Agreement").

         D. All obligations of the Borrower to Lender are secured by a security
interest in (among other collateral) the Borrower's inventory, equipment, rights
to payment and general intangibles pursuant to a Borrower's Security Agreement
between Borrower and Lender and the Addendum thereto, each dated December 22,
1998 ( The Security Agreement"), and that security interest has been properly
perfected. In addition, Borrower specifically assigned six (6) trademarks and
ten (10) patents pursuant to an Assignment of Security Interest in United States
Trademarks and Patents (the "Assignment," and collectively with the Security
Agreement, the "Security Documents")

<PAGE>   2

dated as of December 22, 1998 between Borrower, as assignor, and Lender, as
assignee. The Assignment was properly recorded with the United States Patent and
Trademark Office effective on January 14, 1999.

         E. Borrower and Lender desire to amend the Loan Agreement, as
specifically hereinafter set forth.

                                   AGREEMENT:

         NOW, THEREFORE, in consideration of the foregoing recitals, the
agreements set forth herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

         1. Incorporation of Recitals. The foregoing recitals are hereby
incorporated herein and made a part hereof.

         2. Confirmation of Indebtedness. The outstanding principal balance
under the Revolving Note as of March 29, 2000 is $1,500,000. The outstanding
principal balance under the Term Note as of March 29, 2000 is $1,111,017.47.
Interest has and continues to accrue under the Notes in accordance with the
terms thereof.

         3. Limited Waiver. Subject to the Borrower's agreement hereto, Lender
hereby waives any default which has occurred by reason of Borrower's failure to
comply with the EBITDA covenant set forth in section 5.09(b)(i) of the Loan
Agreement as of December 31, 1999.

         4. Amendment to Loan Agreement. Section 5.09 is deleted in its entirety
and replaced with the following:

             5.09  Financial Condition. Maintain the financial condition of
                   Borrower, determined in accordance with GAAP, so that it
                   meets the following requirements all determined on a
                   quarterly basis as of the end of each fiscal quarter and,
                   where indicated, for the preceding or trailing 12 month
                   period (the "TTMP"):

                   (a)   Commencing with the quarter ending December 31, 1998
                         through the quarter ending March 31, 1999 and then
                         again commencing with the quarter ending December 31,
                         2000 and thereafter:

                         i.   Borrower's ratio of EBITDA to interest expense
                              will be not less than 2.00:1 for the TTMP;

                         ii.  Borrower's ratio of Free Cash Flow to Debt Service
                              will be not less than 1.15:1 for the TTMP; and

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                         iii. Borrower's ratio of Debt as of the end of such
                              fiscal quarter to EBITDA for the TTMP will be not
                              more than 3.00:1.

                   (b)   Commencing with the quarter ending December 31, 1998
                         through the quarter ending March 31, 1999 and then
                         again commencing with the quarter ending June 30, 2000
                         and thereafter:

                         i.   Borrower's Tangible Net Worth will be not less
                              than $3,500,000 as of the end of each fiscal
                              quarter.

                   (c)   Commencing with the quarter ending June 30, 1999 and
                         continuing through the quarter ending December 31,
                         2000:

                         i.   Borrower's EBITDA will not be negative more than
                              $975,000 at 6/30/99 and will not be less that
                              $75,000 at 9/30/99, $725,000 at 12/31/99, $75,000
                              at 3/1/00, $500,000 at 6/30/00 and 9/30/00, and
                              $750,000 at 12/31/00; and

                         ii.  Borrower's Quick Ratio will be not less than
                              1.25:1 as of the end of each fiscal quarter.

                   For purposes hereof "Free Cash Flow" means EBITDA less cash
                   taxes, cash capital expenditures and cash dividends: "Debt
                   Service" means interest expense plus all mandatory principal
                   payments on Debt; "Tangible Net Worth" means stockholders'
                   equity less intangible assets; and "Quick Ratio" means the
                   ratio of current assets less inventory to current
                   liabilities, all as determined in accordance with GAAP.

5. General Release. Borrower, for and on behalf of itself and its legal
representatives, heirs, successors and assigns, does hereby waive, release,
relinquish and forever discharge Lender and its past and present directors,
officers, agents, employees, parents, subsidiaries, affiliates, insurers,
attorneys, representatives and assigns, and each and all thereof (collectively,
the "Released Parties"), of and from any and all manner of action or causes of
action, suits, claims, demands, judgements, damages, levies, and the execution
of whatsoever kind, nature and/or description arising on or before the date
hereof, including, without limitation, any claims, losses, costs or damages,
including compensatory and punitive damages, in each case whether known or
unknown, liquidated or unliquidated, fixed or contingent, direct or indirect,
which Borrower, or its legal representatives, heirs, successors or assigns, ever
had or now has or may claim to have against any of the Released Parties, with
respect to any matter whatsoever, including,

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without limitation, this Amendment and any other instruments and agreements
executed by Borrower in connection herewith, arising on or before the date
hereof.

         6. Effect of Amendment; Representations and Warranties; Nonwaiver.
Lender and Borrower agree that the Loan Agreement, as amended by this Amendment,
the Notes and the Security Documents remain in full force and effect. Borrower
represents and warrants that it has the power and legal right and authority to
enter into this Amendment, and that neither this Amendment, nor the agreements
contained herein, contravene or constitute a default under any agreement,
instrument or indenture to which Borrower is a party or signatory, or, to the
best knowledge of Borrower, any other agreement or requirement of law. Borrower
represents and warrants that no consent, approval or authorization of or
registration of declaration with any party, including but not limited to any
governmental authority, is required in connection with the execution and
delivery by Borrower of this Amendment, or the performance of its obligations
herein described.

         7. Ratification of Notes, Loan Agreement and Security Documents. All of
the terms, conditions, provisions, agreements, requirements, promises
obligations, duties, covenants and representations under the Loan Agreement, as
amended by this Amendment, the Notes and the Security Documents are hereby
ratified and affirmed in all respects by Borrower. Borrower further represents
and warrants that the Security Documents continue to secure the obligations of
Borrower under the Notes.

         8. Further Assurances. The Borrower shall promptly correct any defect
or error that may be discovered in any Security Document or in the execution,
acknowledgement or recordation thereof. Promptly upon request by the Lender, the
Borrower also shall do, execute, acknowledge, deliver, record, re-record, file,
re-file, register and re-register, any and all deeds, conveyances, mortgages,
deeds of trust, trust deeds, assignments, estoppel certificates, financing
statements and continuations thereof, notices of assignment, transfers,
certificates, assurances and other instruments as Lender may reasonably require
from time to time in order: (a) to carry out more effectively the purposes of
the Security Documents; (b) to perfect and maintain the validity, effectiveness
and priority of any security interests intended to be created by the Security
Documents; (c) to grant the Lender, to secure the Notes, a perfected lien in any
intellectual property or other assets owned by the Borrower, and (d) to better
assure, convey, grant, assign, transfer, preserve, protect and confirm unto
Lender the rights granted now or hereafter intended to be granted to Lender
under any Security Document or under any other instrument executed in connection
with any Security Document or that the Borrower may be or become bound to
convey, mortgage or assign to Lender in order to carry out the intention or
facilitate the performance of the provisions of any Security Document. The
Borrower shall furnish evidence satisfactory to Lender of every such recording,
filing or registration.

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         9. Merger and Integration, Superseding Effect. This Amendment embodies
the entire agreement and understanding between the parties hereto with respect
to the subject matter hereof and supersedes and has merged into it all prior
and written agreements in the same subjects by and between the parties hereto
with the effect that this Amendment shall control.

         10. Counterparts. This Amendment may be executed in different
counterparts with the same Effect as if the signatures thereon were in the same
instrument, and will be effective upon delivery of all such counterparts to
Lender.

         11. Governing Law. THE LAWS OF THE STATE OF COLORADO GOVERN THIS
AMENDMENT.

         12. Advice of Counsel. Borrower acknowledges and agrees that it has
received the advice of independent counsel selected by it, or the opportunity to
obtain such advice, before entering into this Amendment and any other
instruments and agreements executed by Borrower in connection herewith, and has
not relied upon Lender or any of its officers, directors, employees, agents or
attorneys concerning any aspect of the transactions contemplated by this
Amendment or any of the other said instruments and agreements.

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered as of the date and year first above written.

                                      QUALMARK CORPORATION

                                      By /s/ Vernon W. Settle
                                         --------------------
                                         VP of Finance and Administration
                                         --------------------------------
                                         (Print Name and Title)

                                      U.S. BANK NATIONAL ASSOCIATION

                                       By
                                          ------------------------------------
                                          Richard J. Mikos, Vice President

                                       5<PAGE>   1

                                                                    EXHIBIT 10.1

                           THIRTEENTH AMENDMENT TO THE
                     THIRD AMENDED AND RESTATED AGREEMENT OF
                  LIMITED PARTNERSHIP OF AIMCO PROPERTIES, L.P.

         This THIRTEENTH AMENDMENT TO THE THIRD AMENDED AND RESTATED AGREEMENT
OF LIMITED PARTNERSHIP OF AIMCO PROPERTIES, L.P., dated as of August 7, 2000
(this "Amendment"), is being executed by AIMCO-GP, Inc., a Delaware corporation
(the "General Partner"), as the general partner of AIMCO Properties, L.P., a
Delaware limited partnership (the "Partnership"), pursuant to the authority
conferred on the General Partner by Section 7.3.C(7) of the Third Amended and
Restated Agreement of Limited Partnership of AIMCO Properties, L.P., dated as of
July 29, 1994, as amended and/or supplemented from time to time (the
"Agreement"). Capitalized terms used, but not otherwise defined herein, shall
have the respective meanings ascribed thereto in the Agreement.

         WHEREAS, pursuant to Section 4.2.A of the Agreement, the General
Partner is authorized to determine the designations, preferences and relative,
participating, optional or other special rights, powers and duties of
Partnership Preferred Units.

         NOW, THEREFORE, in consideration of the foregoing, and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         (1) The Agreement is hereby amended by the addition of a new exhibit,
entitled "Exhibit X," in the form attached hereto, which shall be attached to
and made a part of the Agreement.

         (2) Except as specifically amended hereby, the terms, covenants,
provisions and conditions of the Agreement shall remain unmodified and continue
in full force and effect and, except as amended hereby, all of the terms,
covenants, provisions and conditions of the Agreement are hereby ratified and
confirmed in all respects.

         IN WITNESS WHEREOF, this Amendment has been executed as of the date
first written above.

                                           THE GENERAL PARTNER:

                                           AIMCO-GP, INC.

                                           By: /s/ PETER K. KOMPANIEZ
                                              --------------------------------
                                              Name: Peter K. Kompaniez
                                              Title: President and Vice Chairman

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                                    EXHIBIT X

                         PARTNERSHIP UNIT DESIGNATION OF
                  THE CLASS SIX PARTNERSHIP PREFERRED UNITS OF
                             AIMCO PROPERTIES, L.P.

         1.       Number of Units and Designation.

         A class of Partnership Preferred Units is hereby designated as "Class
Six Partnership Preferred Units," and the number of Partnership Preferred Units
constituting such class shall be 900,000.

         2.       Definitions.

         Capitalized terms used and not otherwise defined herein shall have the
meanings assigned thereto in the Third Amended and Restated Agreement of Limited
Partnership of AIMCO Properties, L.P. as amended, supplemented or restated from
time to time (the "Agreement"), as modified by this Partnership Unit Designation
and the defined terms used herein. For purposes of this Partnership Unit
Designation, the following terms shall have the respective meanings ascribed
below:

         "Adjustment Factor" means 1.0; provided, however, that in the event
that:

         (i) the Previous General Partner (a) declares or pays a dividend on its
outstanding REIT Shares in REIT Shares or makes a distribution to all holders of
its outstanding REIT Shares in REIT Shares, (b) splits or subdivides its
outstanding REIT Shares or (c) effects a reverse stock split or otherwise
combines its outstanding REIT Shares into a smaller number of REIT Shares, the
Adjustment Factor shall be adjusted by multiplying the Adjustment Factor
previously in effect by a fraction, (i) the numerator of which shall be the
number of REIT Shares issued and outstanding on the record date for such
dividend, distribution, split, subdivision, reverse split or combination
(assuming for such purposes that such dividend, distribution, split,
subdivision, reverse split or combination has occurred as of such time) and (ii)
the denominator of which shall be the actual number of REIT Shares (determined
without the above assumption) issued and outstanding on the record date for such
dividend, distribution, split, subdivision, reverse split or combination;

         (ii) the Previous General Partner distributes any rights, options or
warrants to all holders of its REIT Shares to subscribe for or to purchase or to
otherwise acquire REIT Shares (or other securities or rights convertible into,
exchangeable for or exercisable for REIT Shares) at a price per share less than
the Value of a REIT Share on the record date for such distribution (each a
"Distributed Right"), then the Adjustment Factor shall be adjusted by
multiplying the Adjustment Factor previously in effect by a fraction (a) the
numerator of which shall be the number of REIT Shares issued and outstanding on
the record date plus the maximum number of REIT Shares purchasable under such
Distributed Rights and (b) the denominator of which shall be the number of REIT
Shares issued and outstanding on the record date plus a fraction (1) the
numerator of which is the maximum number of REIT Shares purchasable under such
Distributed Rights times the minimum purchase price per REIT Share under such
Distributed Rights and (2) the denominator of which is the Value of a REIT Share
as of the record date; provided, however, that, if any such Distributed Rights
expire or become no longer exercisable, then the Adjustment Factor shall be
adjusted, effective retroactive to the date of distribution of the Distributed
Rights, to reflect a reduced maximum number of REIT Shares or any change in the
minimum purchase price for the purposes of the above fraction; and

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         (iii) the Previous General Partner shall, by dividend or otherwise,
distribute to all holders of its REIT Shares evidences of its indebtedness or
assets (including securities, but excluding any dividend or distribution
referred to in subsection (i) above), which evidences of indebtedness or assets
relate to assets not received by the Previous General Partner, the General
Partner and/or the Special Limited Partner pursuant to a pro rata distribution
by the Partnership, then the Adjustment Factor shall be adjusted to equal the
amount determined by multiplying the Adjustment Factor in effect immediately
prior to the close of business on the date fixed for determination of
shareholders entitled to receive such distribution by a fraction (i) the
numerator shall be such Value of a REIT Share on the date fixed for such
determination and (ii) the denominator shall be the Value of a REIT Share on the
dates fixed for such determination less the then fair market value (as
determined by the General Partner, whose determination shall be conclusive) of
the portion of the evidences of indebtedness or assets so distributed applicable
to one REIT Share.

         Any adjustments to the Adjustment Factor shall become effective
immediately after the effective date of such event, retroactive to the record
date, if any, for such event.

         "Assignee" shall mean a Person to whom one or more Preferred Units have
been Transferred in a manner permitted under the Agreement, but who has not
become a Substituted Limited Partner, and who has the rights set forth in
Section 11.5 of the Agreement.

         "Cash Amount" shall mean, with respect to any Tendered Units, cash in
an amount equal to the sum of (x) the product of (i) the number of Tendered
Units, multiplied by (ii) the Liquidation Preference for a Preferred Unit, plus,
(y) if positive, the product of (i) the number of Tendered Units, multiplied by
(ii) the Liquidation Preference for a Preferred Unit (excluding any accumulated,
accrued or unpaid distributions), multiplied by (iii) the quotient obtained by
dividing (a) the amount by which the Market Value of a Common Share, calculated
as of the date of receipt by the General Partner of a Notice of Redemption for
such Tendered Units, exceeds $50, by (b) $50.

         "Class Six Partnership Preferred Unit" or "Preferred Unit" shall mean a
Partnership Preferred Unit with the designations, preferences and relative,
participating, optional or other special rights, powers and duties as are set
forth in this Partnership Unit Designation.

         "Common Shares" shall mean the shares of Class A Common Stock of the
Previous General Partner.

         "Common Shares Amount" shall mean, with respect to any Tendered Units,
a number of Common Shares equal to the quotient obtained by dividing (i) the
Cash Amount for such Tendered Units, by (ii) the Market Value of a Common Share
calculated as of the date of receipt by the General Partner of a Notice of
Redemption for such Tendered Units.

         "Conversion Price" shall mean, as of any date, the quotient obtained by
dividing $50 by the Adjustment Factor in effect as of such date.

         "Current Market Price" of a share of any Equity Stock shall mean the
closing price, regular way on such day, or, if no sale takes place on such day,
the average of the reported closing bid and asked prices, regular way, on such
day, in either case as reported on the principal national securities exchange on
which such securities are listed or admitted for trading, or, if such security
is not quoted on any national securities exchange, on the NASDAQ National Market
or if such security is not quoted on the NASDAQ National Market, the average of
the closing bid and asked prices on such day in the over-the-counter market as
reported by NASDAQ or, if bid and asked prices for each security on such

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day shall not have been reported through NASDAQ, the average of the bid and
asked prices on such day as furnished by any New York Stock Exchange or National
Association of Securities Dealers, Inc. member firm regularly making a market in
such security selected for such purpose by the Chief Executive Officer of the
General Partner or the Board of Directors of the General Partner or if any class
or series of securities are not publicly traded, the fair value of the shares of
such class as determined reasonably and in good faith by the Board of Directors
of the General Partner.

         "Cut-Off Date" shall mean the fifth (5th) Business Day after the
General Partner's receipt of a Notice of Redemption.

         "Declination" shall have the meaning set forth in Section 6(f) of this
Partnership Unit Designation.

         "Distribution Payment Date" shall have the meaning set forth in Section
4(a) of this Partnership Unit Designation.

         "Equity Stock" shall mean one or more shares of any class of capital
stock of the Previous General Partner.

         Internal Rate of Return" shall mean, as of any determination date, the
effective discount rate under which the present value of the Inflows associated
with an outstanding Class Six Partnership Preferred Unit equals $25. For
purposes of calculation of Internal Rate of Return, "Inflows" shall mean (a) all
distributions (whether paid in cash or property) that have been received in
respect of such unit, (b) the cash payment in respect of distributions payable
on such unit pursuant to Section 7(b)(iii) hereof if such unit were converted to
Partnership Common Units on the determination date, and (c) the amount by which
the Market Value of a REIT Share, as of the determination date, exceeds the
Conversion Price then in effect. For purposes of calculating the amounts of any
Inflows, all distributions received in property shall be deemed to have a value
equal to the Market Value of such distributions as of the date such distribution
is received. Neither the fact of any transfer of any units of the Class Six
Partnership Preferred Units nor the amount of any consideration received by the
holder thereof or paid by any successor holder in connection with any transfer
shall affect the calculation of Internal Rate of Return.

         "Junior Partnership Units" shall have the meaning set forth in Section
3(c) of this Partnership Unit Designation.

         "Liquidation Preference" shall have the meaning set forth in Section
5(a) of this Partnership Unit Designation.

         "Majority in Interest of the Limited Partners" means Limited Partners
(other than (i) the Special Limited Partner and (ii) any Limited Partner fifty
percent (50%) or more of whose equity is owned, directly or indirectly, by the
(a) General Partner or (b) any REIT as to which the General Partner is a
"qualified REIT subsidiary" (within the meaning of Code Section 856(i)(2)))
holding more than fifty percent (50%) of the outstanding Partnership Common
Units, Class I High Performance Partnership Units, Class Six Partnership
Preferred Units and all other outstanding classes of Partnership Units held by
all Limited Partners (other than (i) the Special Limited Partner and (ii) any
Limited Partner fifty percent (50%) or more of whose equity is owned, directly
or indirectly, by (a) the General Partner or (b) any REIT as to which the
General Partner is a "qualified REIT subsidiary" (within the meaning of Code
Section 856(i)(2))).

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         "Market Value" shall mean, as of any calculation date and with respect
to any share of stock, the average of the daily market prices for ten (10)
consecutive trading days (or twenty (20) consecutive Trading Days for purposes
of calculating "Internal Rate of Return") immediately preceding the calculation
date. The market price for any such trading day shall be:

                  (i) if the shares are listed or admitted to trading on any
         securities exchange or The Nasdaq Stock Market's National Market
         System, the closing price, regular way, on such day, or if no such sale
         takes place on such day, the average of the closing bid and asked
         prices on such day, in either case as reported in the principal
         consolidated transaction reporting system,

                  (ii) if the shares are not listed or admitted to trading on
         any securities exchange or The Nasdaq Stock Market's National Market
         System, the last reported sale price on such day or, if no sale takes
         place on such day, the average of the closing bid and asked prices on
         such day, as reported by a reliable quotation source designated by the
         General Partner, or

                  (iii) if the shares are not listed or admitted to trading on
         any securities exchange or The Nasdaq Stock Market's National Market
         System and no such last reported sale price or closing bid and asked
         prices are available, the average of the reported high bid and low
         asked prices on such day, as reported by a reliable quotation source
         designated by the General Partner, or if there shall be no bid and
         asked prices on such day, the average of the high bid and low asked
         prices, as so reported, on the most recent day (not more than ten (10)
         days prior to the date in question) for which prices have been so
         reported;

provided, however, that, if there are no bid and asked prices reported during
the ten (10) days prior to the date in question, the Market Value of the shares
shall be determined by the General Partner acting in good faith on the basis of
such quotations and other information as it considers, in its reasonable
judgment, appropriate; provided, further, that the General Partner is authorized
to adjust the market price for any trading day as may be necessary, in its
judgment, to reflect an event that occurs at any time after the commencement of
such ten day period that would unfairly distort the Market Value, including,
without limitation, a stock dividend, split, subdivision, reverse stock split,
or share combination.

         "Notice of Redemption" shall mean a Notice of Redemption in the form of
Annex I to this Partnership Unit Designation.

         "Parity Partnership Units" shall have the meaning set forth in Section
3(b) of this Partnership Unit Designation.

         "Partnership" shall mean AIMCO Properties, L.P., a Delaware limited
partnership.

         "Primary Offering Notice" shall have the meaning set forth in Section
6(h)(4) of this Partnership Unit Designation.

         "Public Offering Funding" shall have the meaning set forth in Section
6(f)(2) of this Partnership Unit Designation.

         "Redemption" shall have the meaning set forth in Section 6(b) of this
Partnership Unit Designation.

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         "Registrable Shares" shall have the meaning set forth in Section
6(f)(2) of this Partnership Unit Designation.

         "Senior Partnership Units" shall have the meaning set forth in Section
3(a) of this Partnership Unit Designation.

         "Single Funding Notice" shall have the meaning set forth in Section
6(f)(3) of this Partnership Unit Designation.

         "Specified Redemption Date" shall mean, with respect to any Redemption,
the later of (a) the tenth (10th) Business Day after the receipt by the General
Partner of a Notice of Redemption or (b) in the case of a Declination followed
by a Public Offering Funding, the Business Day next following the date of the
closing of the Public Offering Funding; provided, however, that the Specified
Redemption Date, as well as the closing of a Redemption, or an acquisition of
Tendered Units by the Previous General Partner pursuant to Section 5 hereof, on
any Specified Redemption Date, may be deferred, in the General Partner's sole
and absolute discretion, for such time (but in any event not more than one
hundred fifty (150) days in the aggregate) as may reasonably be required to
effect, as applicable, (i) a Public Offering Funding or other necessary funding
arrangements, (ii) compliance with the Securities Act or other law (including,
but not limited to, (a) state "blue sky" or other securities laws and (b) the
expiration or termination of the applicable waiting period, if any, under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended) and (iii)
satisfaction or waiver of other commercially reasonable and customary closing
conditions and requirements for a transaction of such nature.

         "Tendering Party" shall have the meaning set forth in Section 6(b)
hereof.

         "Tendered Units" shall have the meaning set forth in Section 6(b)
hereof.

         "Trading Day" shall mean, when used with respect to the Closing Price
of a share of any Equity Stock, (i) if the Equity Stock is listed or admitted to
trading on the NYSE, a day on which the NYSE is open for the transaction of
business, (ii) if the Equity Stock is not listed or admitted to trading on the
NYSE but is listed or admitted to trading on another national securities
exchange or automated quotation system, a day on which the principal national
securities exchange or automated quotation system, as the case may be, on which
the Equity Stock is listed or admitted to trading is open for the transaction of
business, or (iii) if the Equity Stock is not listed or admitted to trading on
any national securities exchange or automated quotation system, any day other
than a Saturday, a Sunday or a day on which banking institutions in the State of
New York are authorized or obligated by law or executive order to close.

         "Transfer Agent" shall mean such transfer agent as may be designated by
the Partnership or its designee as the transfer agent for the Class Six
Partnership Preferred Units; provided, that if the Partnership has not
designated a transfer agent then the Partnership shall act as the transfer agent
for the Class Six Partnership Preferred Units.

         3.       Ranking.

         Any class or series of Partnership Units of the Partnership shall be
deemed to rank:

                  (a) prior or senior to the Class Six Partnership Preferred
Units, as to the payment of distributions and as to the distribution of assets
upon liquidation, dissolution or winding up, if the holders of such class or
series shall be entitled to the receipt of distributions and of amounts

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distributable upon liquidation, dissolution or winding up, as the case may be,
in preference or priority to the holders of Class Six Partnership Preferred
Units (the Partnership Units referred to in this paragraph being hereinafter
referred to, collectively, as "Senior Partnership Units");

                  (b) on a parity with the Class Six Partnership Preferred
Units, as to the payment of distributions and as to the distribution of assets
upon liquidation, dissolution or winding up, whether or not the distribution
rates, distribution payment dates or redemption or liquidation prices per unit
or other denomination thereof be different from those of the Class Six
Partnership Preferred Units if (i) such class or series of Partnership Units
shall be Class B Partnership Preferred Units, Class C Partnership Preferred
Units, Class D Partnership Preferred Units, Class G Partnership Preferred Units,
Class H Partnership Preferred Units, Class I Partnership Preferred Units, Class
J Partnership Preferred Units, Class K Partnership Preferred Units, Class L
Partnership Preferred Units, Class M Partnership Preferred Units, Class One
Partnership Preferred Units, Class Two Partnership Preferred Units, Class Three
Partnership Preferred Units, Class Four Partnership Preferred Units or Class
Five Partnership Preferred Units or (ii) the holders of such class or series of
Partnership Units and the Class Six Partnership Preferred Units shall be
entitled to the receipt of distributions and of amounts distributable upon
liquidation, dissolution or winding up in proportion to their respective amounts
of accrued and unpaid distributions per unit or other denomination or
liquidation preferences, without preference or priority one over the other (the
Partnership Units referred to in clauses (i) and (ii) of this paragraph being
hereinafter referred to, collectively, as "Parity Partnership Units"); and

                  (c) junior to the Class Six Partnership Preferred Units, as to
the payment of distributions and as to the distribution of assets upon
liquidation, dissolution or winding up, if (i) such class or series of
Partnership Units shall be Partnership Common Units or Class I High Performance
Partnership Units or (ii) the holders of Class Six Partnership Preferred Units
shall be entitled to receipt of distributions or of amounts distributable upon
liquidation, dissolution or winding up, as the case may be, in preference or
priority to the holders of such class or series of Partnership Units (the
Partnership Units referred to in clauses (i) and (ii) of this paragraph being
hereinafter referred to, collectively, as "Junior Partnership Units").

         4.       Quarterly Cash Distributions.

                  (a) Holders of Preferred Units will be entitled to receive,
when and as declared by the General Partner, quarterly cash distributions at the
rate of $0.53125 per Preferred Unit. Any such distributions will be cumulative
from the date of original issue, whether or not in any distribution period or
periods such distributions have been declared, and shall be payable quarterly on
February 15, May 15, August 15 and November 15 of each year (or, if not a
Business Day, the next succeeding Business Day) (each a "Distribution Payment
Date"), commencing on the first such date occurring after the date of original
issue. If the Preferred Units are issued on any day other than a Distribution
Payment Date, the first distribution payable on such Preferred Units will be
prorated for the portion of the quarterly period that such Preferred Units are
outstanding on the basis of twelve 30-day months and a 360-day year.
Distributions will be payable in arrears to holders of record as they appear on
the records of the Partnership at the close of business on February 1, May 1,
August 1 or November 1, as the case may be, immediately preceding each
Distribution Payment Date. Holders of Preferred Units will not be entitled to
receive any distributions in excess of cumulative distributions on the Preferred
Units. No interest, or sum of money in lieu of interest, shall be payable in
respect of any distribution payment or payments on the Preferred Units that may
be in arrears. Holders of any Preferred Units that are issued after the date of
original issuance will be entitled to receive the same distributions as holders
of any Preferred Units issued on the date of original issuance.

                                       X-6

<PAGE>   8

                  (b) When distributions are not paid in full upon the Preferred
Units or any Parity Partnership Units, or a sum sufficient for such payment is
not set apart, all distributions declared upon the Preferred Units and any
Parity Partnership Units shall be declared ratably in proportion to the
respective amounts of distributions accumulated and unpaid on the Preferred
Units and accumulated and unpaid on such Parity Partnership Units. Except as set
forth in the preceding sentence, unless distributions on the Preferred Units
equal to the full amount of accumulated and unpaid distributions have been or
contemporaneously are declared and paid, or declared and a sum sufficient for
the payment thereof has been or contemporaneously is set apart for such payment,
for all past distribution periods, no distributions shall be declared or paid or
set apart for payment by the Partnership with respect to any Parity Partnership
Units.

                  (c) Unless full cumulative distributions (including all
accumulated, accrued and unpaid distributions) on the Preferred Units have been
declared and paid, or declared and set apart for payment, for all past
distribution periods, no distributions (other than distributions paid in Junior
Partnership Units or options, warrants or rights to subscribe for or purchase
Junior Partnership Units) may be declared or paid or set apart for payment by
the Partnership and no other distribution of cash or other property may be
declared or made, directly or indirectly, by the Partnership with respect to any
Junior Partnership Units, nor shall any Junior Partnership Units be redeemed,
purchased or otherwise acquired (except for a redemption, purchase or other
acquisition of Partnership Common Units made for purposes of an employee
incentive or benefit plan of the Partnership or any affiliate thereof,
including, without limitation, the Previous General Partner and its affiliates)
for any consideration (or any monies be paid to or made available for a sinking
fund for the redemption of any such Junior Partnership Units), directly or
indirectly, by the Partnership (except by conversion into or exchange for Junior
Partnership Units, or options, warrants or rights to subscribe for or purchase
Junior Partnership Units), nor shall any other cash or other property be paid or
distributed to or for the benefit of holders of Junior Partnership Units.

                  (d) Notwithstanding the foregoing provisions of this Section
4, the Partnership shall not be prohibited from (i) declaring or paying or
setting apart for payment any distribution on any Parity Partnership Units or
(ii) redeeming, purchasing or otherwise acquiring any Parity Partnership Units,
in each case, if such declaration, payment, redemption, purchase or other
acquisition is necessary to maintain the Previous General Partner's
qualification as a REIT.

         5.       Liquidation Preference.

                  (a) Upon any voluntary or involuntary liquidation, dissolution
or winding up of the Partnership, before any allocation of income or gain by the
Partnership shall be made to or set apart for the holders of any Junior
Partnership Units, to the extent possible, the holders of Preferred Units shall
be entitled to be allocated income and gain to effectively enable them to
receive a liquidation preference (the "Liquidation Preference") of (i) $25 per
Preferred Unit, plus (ii) accumulated, accrued and unpaid distributions (whether
or not earned or declared) to the date of final distribution to such holders;
but such holders shall not be entitled to any further allocation of income or
gain. Until all holders of the Preferred Units have been paid the Liquidation
Preference in full, no allocation of income or gain will be made to any holder
of Junior Units upon the liquidation, dissolution or winding up of the
Partnership.

                  (b) If, upon any liquidation, dissolution or winding up of the
Partnership, the assets of the Partnership, or proceeds thereof, distributable
among the holders of Preferred Partnership Units shall be insufficient to pay in
full the Liquidation Preference and liquidating payments on any Parity
Partnership Units, then following certain allocations made by the Partnership,
such assets, or the

                                       X-7

<PAGE>   9

proceeds thereof, shall be distributed among the holders of Preferred Units and
any such Parity Partnership Units ratably in the same proportion as the
respective amounts that would be payable on such Preferred Units and any such
Parity Partnership Units if all amounts payable thereon were paid in full.

                  (c) A voluntary or involuntary liquidation, dissolution or
winding up of the Partnership will not include a consolidation or merger of the
Partnership with one or more partnerships, corporations or other entities, or a
sale or transfer of all or substantially all of the Partnership's assets.

                  (d) Upon any liquidation, dissolution or winding up of the
Partnership, after all allocations shall have been made in full to the holders
of Preferred Units and any Parity Partnership Units to enable them to receive
their respective liquidation preferences, any Junior Partnership Units shall be
entitled to receive any and all assets remaining to be paid or distributed, and
the holders of the Preferred Units and any Parity Partnership Units shall not be
entitled to share therein.

         6.       Redemption.

                  (a) Except as set forth in Section 6(l) hereof, the Preferred
Units may not be redeemed at the option of the Partnership, and will not be
required to be redeemed or repurchased by the Partnership or the Previous
General Partner except if a holder of a Preferred Unit effects a Redemption, as
provided for in Section 6(b) hereof. The Partnership or the Previous General
Partner may purchase Preferred Units from time to time in the open market, by
tender or exchange offer, in privately negotiated purchases or otherwise.

                  (b) On or after the first (1st) anniversary of becoming a
holder of Preferred Units, a Qualifying Party shall have the right (subject to
the terms and conditions set forth herein) to require the Partnership to redeem
all or a portion of the Preferred Units held by such Qualifying Party (any
Preferred Units tendered for Redemption being hereafter "Tendered Units") in
exchange (a "Redemption") for Common Shares issuable on, or the Cash Amount
payable on, the Specified Redemption Date, as determined by the Partnership in
its sole discretion. Any Redemption shall be exercised pursuant to a Notice of
Redemption delivered to the General Partner by the Qualifying Party when
exercising the Redemption right (the "Tendering Party").

                  (c) If the Partnership elects to redeem Tendered Units for
Common Shares rather than cash, then the Partnership shall direct the Previous
General Partner to issue and deliver such Common Shares to the Tendering Party
pursuant to the terms set forth in this Section 6, in which case, (i) the
Previous General Partner, acting as a distinct legal entity, shall assume
directly the obligation with respect thereto and shall satisfy the Tendering
Party's exercise of its Redemption right, and (ii) such transaction shall be
treated, for federal income tax purposes, as a transfer by the Tendering Party
of such Tendered Units to the Previous General Partner in exchange for Common
Shares. In making such election to cause the Previous General Partner to acquire
Tendered Units, the Partnership shall act in a fair, equitable and reasonable
manner that neither prefers one group or class of Tendering Parties over another
nor discriminates against a group or class of Tendering Parties. If the
Partnership elects to redeem any number of Tendered Units for Common Shares,
rather than cash, on the Specified Redemption Date, the Tendering Party shall
sell such number of the Tendered Units to the Previous General Partner in
exchange for a number of Common Shares equal to the Common Shares Amount for
such number of Tendered Units. The Tendering Party shall submit (i) such
information, certification or affidavit as the Previous General Partner may
reasonably require in connection with the application of the Ownership Limit and
other restrictions and limitations of the Charter to any such

                                       X-8

<PAGE>   10

acquisition and (ii) such written representations, investment letters, legal
opinions or other instruments necessary, in the Previous General Partner's view,
to effect compliance with the Securities Act. The Common Shares shall be
delivered by the Previous General Partner as duly authorized, validly issued,
fully paid and non-assessable shares, free of any pledge, lien, encumbrance or
restriction other than the Ownership Limit and other restrictions provided in
the Charter, the Bylaws of the Previous General Partner, the Securities Act and
relevant state securities or "blue sky" laws. Neither any Tendering Party whose
Tendered Units are acquired by the Previous General Partner pursuant to this
Section 6, any Partner, any Assignee nor any other interested Person shall have
any right to require or cause the Previous General Partner or the General
Partner to register, qualify or list any REIT Shares owned or held by such
Person, whether or not such Common Shares are issued pursuant to this Section 6,
with the SEC, with any state securities commissioner, department or agency,
under the Securities Act or the Exchange Act or with any stock exchange;
provided, however, that this limitation shall not be in derogation of any
registration or similar rights granted pursuant to any other written agreement
between the Previous General Partner and any such Person. Notwithstanding any
delay in such delivery, the Tendering Party shall be deemed the owner of such
Common Shares for all purposes, including, without limitation, rights to vote or
consent, receive dividends, and exercise rights, as of the Specified Redemption
Date. Common Shares issued upon an acquisition of the Tendered Units by the
Previous General Partner pursuant to this Section 6 may contain such legends
regarding restrictions under the Securities Act and applicable state securities
laws as the Previous General Partner in good faith determines to be necessary or
advisable in order to ensure compliance with such laws.

                  (d) The Partnership shall have no obligation to effect any
redemption unless and until a Tendering Party has given the Partnership a Notice
of Redemption. Each Notice of Redemption shall be sent by hand delivery or by
first class mail, postage prepaid, to AIMCO Properties, L.P., c/o AIMCO-GP,
Inc., Colorado Center, Tower Two, 2000 South Colorado Boulevard, Suite 2-1000,
Denver, Colorado 80222, Attention: Investor Relations, or to such other address
as the Partnership shall specify in writing by delivery to the holders of the
Preferred Units in the same manner as that set forth above for delivery of the
Notice of Redemption. At any time prior to the Specified Redemption Date for any
Redemption, any holder may revoke its Notice of Redemption.

                  (e) A Tendering Party shall have no right to receive
distributions with respect to any Tendered Units (other than the Cash Amount)
paid after delivery of the Notice of Redemption, whether or not the record date
for such distribution precedes or coincides with such delivery of the Notice of
Redemption. If the Partnership elects to redeem any number of Tendered Units for
cash, the Cash Amount for such number of Tendered Units shall be delivered as a
certified check payable to the Tendering Party or, in the General Partner's sole
and absolute discretion, in immediately available funds.

                  (f) In the event that the Partnership declines to cause the
Previous General Partner to acquire all of the Tendered Units from the Tendering
Party in exchange for Common Shares pursuant to this Section 6 following receipt
of a Notice of Redemption (a "Declination"):

                           (1) The Previous General Partner or the General
                  Partner shall give notice of such Declination to the Tendering
                  Party on or before the close of business on the Cut-Off Date.

                           (2) The Partnership may elect to raise funds for the
                  payment of the Cash Amount either (a) by requiring that the
                  Previous General Partner contribute such funds from the
                  proceeds of a registered public offering (a "Public Offering
                  Funding") by the Previous General Partner of a number of
                  Common Shares

                                       X-9

<PAGE>   11

                  ("Registrable Shares") equal to the Common Shares Amount with
                  respect to the Tendered Units or (b) from any other sources
                  (including, but not limited to, the sale of any Property and
                  the incurrence of additional Debt) available to the
                  Partnership.

                           (3) Promptly upon the General Partner's receipt of
                  the Notice of Redemption and the Previous General Partner or
                  the General Partner giving notice of the Partnership's
                  Declination, the General Partner shall give notice (a "Single
                  Funding Notice") to all Qualifying Parties then holding
                  Preferred Units and having Redemption rights pursuant to this
                  Section 6 and require that all such Qualifying Parties elect
                  whether or not to effect a Redemption of their Preferred Units
                  to be funded through such Public Offering Funding. In the
                  event that any such Qualifying Party elects to effect such a
                  Redemption, it shall give notice thereof and of the number of
                  Preferred Units to be made subject thereon in writing to the
                  General Partner within ten (10) Business Days after receipt of
                  the Single Funding Notice, and such Qualifying Party shall be
                  treated as a Tendering Party for all purposes of this Section
                  6. In the event that a Qualifying Party does not so elect, it
                  shall be deemed to have waived its right to effect a
                  Redemption for the next twelve months; provided, however, that
                  the Previous General Partner shall not be required to acquire
                  Preferred Units pursuant to this Section 6(f) more than twice
                  within any twelve-month period.

Any proceeds from a Public Offering Funding that are in excess of the Cash
Amount shall be for the sole benefit of the Previous General Partner and/or the
General Partner. The General Partner and/or the Special Limited Partner shall
make a Capital Contribution of such amounts to the Partnership for an additional
General Partner Interest and/or Limited Partner Interest. Any such contribution
shall entitle the General Partner and the Special Limited Partner, as the case
may be, to an equitable Percentage Interest adjustment.

                  (g) Notwithstanding the provisions of this Section 6, the
Previous General Partner shall not, under any circumstances, elect to acquire
Tendered Units in exchange for the Common Shares if such exchange would be
prohibited under the Charter.

                  (h) Notwithstanding anything herein to the contrary, with
respect to any Redemption pursuant to this Section 6:

                           (1) All Preferred Units acquired by the Previous
                  General Partner pursuant to this Section 6 hereof shall be
                  contributed by the Previous General Partner to either or both
                  of the General Partner and the Special Limited Partner in such
                  proportions as the Previous General Partner, the General
                  Partner and the Special Limited Partner shall determine.

                           (2) Subject to the Ownership Limit, no Tendering
                  Party may effect a Redemption for less than five hundred (500)
                  Preferred Units or, if such Tendering Party holds (as a
                  Limited Partner or, economically, as an Assignee) less than
                  five hundred (500) Preferred Units, all of the Preferred Units
                  held by such Tendering Party.

                           (3) Each Tendering Party (a) may effect a Redemption
                  only once in each fiscal quarter of a Twelve-Month Period and
                  (b) may not effect a Redemption during the period after the
                  Partnership Record Date with respect to a distribution and

                                      X-10

<PAGE>   12

                  before the record date established by the Previous General
                  Partner for a distribution to its shareholders of some or all
                  of its portion of such Partnership distribution.

                           (4) Notwithstanding anything herein to the contrary,
                  with respect to any Redemption or acquisition of Tendered
                  Units by the Previous General Partner pursuant to this Section
                  6, in the event that the Previous General Partner or the
                  General Partner gives notice to all Limited Partners (but
                  excluding any Assignees) then owning Partnership Interests (a
                  "Primary Offering Notice") that the Previous General Partner
                  desires to effect a primary offering of its equity securities
                  then, unless the Previous General Partner and the General
                  Partner otherwise consent, commencement of the actions denoted
                  in Section 6(f) hereof as to a Public Offering Funding with
                  respect to any Notice of Redemption thereafter received,
                  whether or not the Tendering Party is a Limited Partner, may
                  be delayed until the earlier of (a) the completion of the
                  primary offering or (b) ninety (90) days following the giving
                  of the Primary Offering Notice.

                           (5) Without the Consent of the Previous General
                   Partner, no Tendering Party may effect a Redemption within
                   ninety (90) days following the closing of any prior Public
                   Offering Funding.

                           (6) The consummation of such Redemption shall be
                  subject to the expiration or termination of the applicable
                  waiting period, if any, under the Hart- Scott-Rodino Antitrust
                  Improvements Act of 1976, as amended.

                           (7) The Tendering Party shall continue to own
                  (subject, in the case of an Assignee, to the provision of
                  Section 11.5 of the Agreement) all Preferred Units subject to
                  any Redemption, and be treated as a Limited Partner or an
                  Assignee, as applicable, with respect to such Preferred Units
                  for all purposes of the Agreement, until such Preferred Units
                  are either paid for by the Partnership pursuant to this
                  Section 6 or transferred to the Previous General Partner (or
                  directly to the General Partner or Special Limited Partner)
                  and paid for, by the issuance of the REIT Shares, pursuant to
                  this Section 6 on the Specified Redemption Date. Until a
                  Specified Redemption Date and an acquisition of the Tendered
                  Units by the Previous General Partner pursuant to this Section
                  6, the Tendering Party shall have no rights as a shareholder
                  of the Previous General Partner with respect to the REIT
                  Shares issuable in connection with such acquisition.

For purposes of determining compliance with the restrictions set forth in this
Section 6(h), all Partnership Common Units and Partnership Preferred Units,
including Preferred Units, beneficially owned by a Related Party of a Tendering
Party shall be considered to be owned or held by such Tendering Party.

                  (i) In connection with an exercise of Redemption rights
pursuant to this Section 6, the Tendering Party shall submit the following to
the General Partner, in addition to the Notice of Redemption:

                           (1) A written affidavit, dated the same date as the
                  Notice of Redemption, (a) disclosing the actual and
                  constructive ownership, as determined for purposes of Code
                  Sections 856(a)(6) and 856(h), of Common Shares and any other
                  classes or shares of the Previous General Partner by (i) such
                  Tendering Party and (ii) any

                                      X-11

<PAGE>   13

                  Related Party and (b) representing that, after giving effect
                  to the Redemption, neither the Tendering Party nor any Related
                  Party will own Common Shares in excess of the Ownership Limit;

                           (2) A written representation that neither the
                  Tendering Party nor any Related Party has any intention to
                  acquire any additional Common Shares or any other class of
                  shares of the Previous General Partner prior to the closing of
                  the Redemption on the Specified Redemption Date; and

                           (3) An undertaking to certify, at and as a condition
                  to the closing of the Redemption on the Specified Redemption
                  Date, that either (a) the actual and constructive ownership of
                  Common Shares or any other class of shares of the Previous
                  General Partner by the Tendering Party and any Related Party
                  remain unchanged from that disclosed in the affidavit required
                  by Section 6(i)(a) or (b)) after giving effect to the
                  Redemption, neither the Tendering Party nor any Related Party
                  shall own Common Shares or other shares of the Previous
                  General Partner in violation of the Ownership Limit.

                  (j) On or after the Specific Redemption Date, each holder of
Preferred Units shall surrender to the Partnership the certificate evidencing
such holder's Preferred Units, at the address to which a Notice of Redemption is
required to be sent. Upon such surrender of a certificate, the Partnership shall
thereupon pay the former holder thereof the applicable Cash Amount and/or
deliver Common Shares for the Preferred Units evidenced thereby. From and after
the Specific Redemption Date (i) distributions with respect to the Preferred
Units shall cease to accumulate, (ii) the Preferred Units shall no longer be
deemed outstanding, (iii) the holders thereof shall cease to be Partners to the
extent of their interest in such Preferred Units, and (iv) all rights whatsoever
with respect to the Preferred Units shall terminate, except the right of the
holders of the Preferred Units to receive Cash Amount and/or Common Shares
therefor, without interest or any sum of money in lieu of interest thereon, upon
surrender of their certificates therefor.

                  (k) Notwithstanding the provisions of this Section 6, the
Tendering Parties (i) shall not be entitled to elect or effect a Redemption
where the Redemption would consist of less than all the Preferred Units held by
Partners and, to the extent that the aggregate Percentage Interests of the
Limited Partners would be reduced, as a result of the Redemption, to less than
one percent (1%) and (ii) shall have no rights under the Agreement that would
otherwise be prohibited under the Charter. To the extent that any attempted
Redemption would be in violation of this Section 6(k), it shall be null and void
ab initio, and the Tendering Party shall not acquire any rights or economic
interests in Common Shares otherwise issuable by the Previous General Partner
hereunder.

                  (l) Notwithstanding any other provision of the Agreement, on
and after the date on which the aggregate Percentage Interests of the Limited
Partners (other than the Special Limited Partner) are less than one percent
(1%), the Partnership shall have the right, but not the obligation, from time to
time and at any time to redeem any and all outstanding Limited Partner Interests
(other than the Special Limited Partner's Limited Partner Interest) by treating
any Limited Partner as a Tendering Party who has delivered a Notice of
Redemption pursuant to this Section 6 for the amount of Preferred Units to be
specified by the General Partner, in its sole and absolute discretion, by notice
to such Limited Partner that the Partnership has elected to exercise its rights
under this Section 6(l). Such notice given by the General Partner to a Limited
Partner pursuant to this Section 6(l) shall be treated as if it were a Notice of
Redemption delivered to the General Partner by such Limited Partner. For
purposes of this Section 6(l), (a) any Limited Partner (whether or not eligible
to be a Tendering

                                      X-12

<PAGE>   14

Party) may, in the General Partner's sole and absolute discretion, be treated as
a Tendering Party and (b) the provisions of Sections 6(f)(1), 6(h)(2), 6(h)(3)
and 6(h)(5) hereof shall not apply, but the remainder of this Section shall
apply, mutatis mutandis.

         7.       Conversion.

                  (a) (i) Subject to and upon compliance with the provisions of
this Section 7, a holder of Class Six Partnership Preferred Units shall have the
right, at such holder's option, to convert such units, in whole or in part, into
the number of Partnership Common Units per Class Six Partnership Preferred Unit
obtained by dividing the Liquidation Preference (excluding any accumulated,
accrued and unpaid distributions) per Class Six Partnership Preferred Unit by
the Conversion Price in effect at the time and on the date provided for in
subparagraph (b)(iv) of this Section 7. In order to exercise the conversion
right, the holder of each Class Six Partnership Preferred Unit to be converted
shall surrender the certificate representing such unit, duly endorsed or
assigned to the Partnership or in blank, at the office of the Transfer Agent,
accompanied by written notice to the Partnership that the holder thereof elects
to convert such Class Six Partnership Preferred Unit.

                      (ii) With respect to any Class Six Partnership Preferred
Units that have been issued and outstanding for at least three (3) years, if, as
of any date, the Internal Rate of Return exceeds 12.5%, then the Partnership
shall have the right, but not the obligation, to cause such Class Six
Partnership Preferred Units to be converted, in whole or in part, into the
number of Partnership Common Units per Class Six Partnership Preferred Unit
obtained by dividing the Liquidation Preference (excluding any accumulated,
accrued and unpaid distributions) per Class Six Partnership Preferred Unit by
the Conversion Price in effect at the time and on the date provided for in
subparagraph (b)(iv) of this Section 7. In order to exercise the conversion
right, the Partnership shall send notice of such conversion to each holder of
record of Class Six Partnership Preferred Units no later than five Business Days
after a date on which the Internal Rate of Return exceeds 12.5%. Such notice
shall be provided by facsimile or, if facsimile is not available, then by first
class mail, postage prepaid, at such holders' address as the same appears on the
records of the Partnership. Any notice which was transmitted or mailed in the
manner herein provided shall be conclusively presumed to have been duly given on
the date received by the holder. Each such notice shall state, as appropriate:
(1) the date of conversion, which date may be any date within one business day
following the date on which the notice is transmitted or mailed; (2) the number
of units of Class Six Partnership Preferred Units to be converted and, if fewer
than all such units held by such holder are to be converted, the number of such
units to be converted; and (3) the then current Conversion Price. Upon receiving
such notice of conversion, each such holder shall promptly surrender the
certificates representing such Class Six Partnership Preferred Units as are
being converted on the conversion date, duly endorsed or assigned to the
Partnership or in blank, at the office of the Transfer Agent; provided, however,
that the failure to so surrender any such certificates shall not in any way
affect the validity of the conversion of the underlying Class Six Partnership
Preferred Units into Partnership Common Units.

                  (b) (i) Unless the Partnership Common Units issuable on
conversion are to be issued in the same name as the name in which such Class Six
Partnership Preferred Units are registered, each such unit surrendered following
conversion shall be accompanied by instruments of transfer, in form satisfactory
to the Partnership, duly executed by the holder or such holder's duly authorized
representative, and an amount sufficient to pay any transfer or similar tax (or
evidence reasonably satisfactory to the Partnership demonstrating that such
taxes have been paid).

                      (ii) A holder of Class Six Partnership Preferred Units
shall, as of the date of the conversion of such units to Partnership Common
Units, be entitled to receive a cash payment in

                                      X-13

<PAGE>   15

respect of any distributions (whether or not earned or declared) that are
accumulated, accrued and unpaid thereon as of the time of such conversion,
provided, however, that payment in respect of any distributions on such units
that has been declared but for which the Distribution Payment Date has not yet
been reached shall be payable as of such Distribution Payment Date. Except as
provided above, the Partnership shall make no payment or allowance for unpaid
distributions, whether or nor in arrears, on converted units.

                      (iii) As promptly as practicable after the surrender of
certificates for Class Six Partnership Preferred Units as aforesaid, and in any
event no later than three business days after the date of such surrender, the
Partnership shall issue and deliver at such office to such holder, or send on
such holders' written order, a certificate or certificates for the number of
full Partnership Common Units issuable upon the conversion of such Class Six
Partnership Preferred Units in accordance with the provisions of this Section 7,
and any fractional interest in respect of a Partnership Common Unit arising upon
such conversion shall be settled as provided in paragraph (c) of this Section 7.

                      (iv) Each conversion shall be deemed to have been effected
(x) in the case of a conversion pursuant to subparagraph (a)(i) of this Section
7 immediately prior to the close of business on the date on which the
certificates for Class Six Partnership Preferred Units shall have been
surrendered and such notice received by the Partnership as provided in
subparagraph (a)(i) of this Section 7, and (y) in the case of a conversion
pursuant to subparagraph (a)(ii) of this Section 7, immediately prior to the
close of business on the date identified as the conversion date in the notice of
conversion sent by the Partnership pursuant to subparagraph (a)(ii) of this
Section 7; and, in the case of (x) or (y), the person or persons in whose name
or names any certificate or certificates for Partnership Common Units shall be
issuable upon such conversion shall be deemed to have become the holder or
holders of record of the units represented thereby at such time on such date,
and such conversion shall be at the Conversion Price in effect at such time on
such date, unless the transfer books of the Partnership shall be closed on that
date, in which event such person or persons shall be deemed to become such
holder or holders of record at the close of business on the next succeeding day
on which such transfer books are open, but such conversion shall be at the
Conversion Price in effect on the date in the notice of conversion sent by the
Partnership as aforesaid.

                  (c) No fractional Partnership Common Units or scrip
representing fractions of a Partnership Common Unit shall be issued upon
conversion of the Class Six Partnership Preferred Units. Instead of any
fractional interest in a Partnership Common Unit that would otherwise be
deliverable upon the conversion of Class Six Partnership Preferred Units, the
Partnership shall pay to the holder of such units an amount of cash equal to the
product of (i) such fraction and (ii) the value of a REIT Share as of the date
of conversion. If more than one of any holder's units shall be converted at one
time, the number of full Partnership Common Units issuable upon conversion
thereof shall be computed on the basis of the aggregate number of Class Six
Partnership Preferred Units so converted.

                  (d) If the Partnership shall be a party to any transaction
(including with limitation a merger, consolidation, statutory exchange, sale of
all or substantially all of the Partnership's assets or recapitalization of the
Partnership Common Units, but excluding any transaction as to which a charge in
the Adjustment Factor would be effected) (each of the foregoing being referred
to herein as a "Transaction"), in each case, as a result of which Partnership
Common Units shall be converted into the right to receive securities or other
property (including cash or any combination thereof), each Class Six Partnership
Preferred Unit which is not converted into the right to receive securities or
other property in connection with such Transaction shall thereupon be
convertible into the kind and amount of securities and other property (including
cash or any combination thereof) receivable upon such consummation by a holder
of that number of Partnership Common Units into which Class Six

                                      X-14

<PAGE>   16

Partnership Preferred Units were convertible immediately prior to such
Transaction. The Partnership shall not be a party to any transaction unless the
terms of such Transaction are consistent with the provisions of this paragraph
(d), and it shall not consent or agree to the occurrence of any Transaction
until the Partnership has entered into an agreement with the successor or
purchasing entity, as the case may be, for the benefit of the holders of the
Class Six Partnership Preferred Units that will contain provisions enabling the
holders of the Class Six Partnership Preferred Units that remain outstanding
after such Transaction to convert into the consideration received by holders of
Partnership Common Units at the Conversion Price in effect immediately prior to
such Transaction. The provisions of this Paragraph (d) shall apply to successive
Transactions.

                  (e) Whenever the Conversion Price is adjusted as herein
provided (whether pursuant to paragraph (d) of this Section 7 or as a result of
a change in the Adjustment Factor), the General Partner shall promptly file with
the Transfer Agent an officer's certificate setting forth the Conversion Price
after such adjustment and setting forth a brief statement of the facts requiring
such adjustment which certificate shall be conclusive evidence of the
correctness of such adjustment absent manifest error. Promptly after delivery of
such certificate, the General Partner shall prepare a notice of such adjustment
of the Conversion Price setting forth the adjusted Conversion Price and the
effective date such adjustment becomes effective and shall mail such notice of
such adjustment of the Conversion Price to each holder of Class Six Partnership
Preferred Units at such holder's address as shown on the records of the
Partnership.

                  (f) In any case in which an adjustment to the Adjustment
Factor shall become effective immediately after the effective date of an event,
retroactive to the record date, if any, for such event, the Partnership may
defer until the occurrence of such event (A) issuing to the holder of any Class
Six Partnership Preferred Units converted after such record date and before the
occurrence of such event the additional Partnership Common Units issuable upon
such conversion by reason of the adjustment required by such event over and
above the Partnership Common Units issuable upon such conversion before giving
effect to such adjustment and (B) paying to such holder any amount of cash in
lieu of any fraction pursuant to Section 7(c).

                  (g) There shall be no adjustment of the Conversion Price in
case of the issuance of any unit of the Partnership except as specifically set
forth in the definition of "Adjustment Factor" or in this Section 7. In
addition, notwithstanding any other provision contained in the definition of
"Adjustment Factor" or in this Section 7, there shall be no adjustment of the
Conversion Price upon the payment of any cash distributions on any units of the
Partnership.

                  (h) If the Partnership shall take any action affecting the
Partnership Common Units, other than action described in the definition of
"Adjustment Factor" or in this Section 7 that, in the opinion of the General
Partner would materially adversely affect the conversion rights of the holders
of Class Six Partnership Preferred Units, the Conversion Price for the Class Six
Partnership Preferred Units may be adjusted, to the extent permitted by law in
such manner, if any, and at such time as the General Partner, in its sole
discretion, may determine to be equitable under the circumstances.

                  (i) The Partnership will pay any and all documentary stamp or
similar issue or transfer taxes payable in respect of the issue or delivery of
Partnership Common Units or other securities or property on conversion of Class
Six Partnership Preferred Units pursuant hereto; provided, however, that the
Partnership shall not be required to pay any tax that may be payable in respect
of any transfer involved in the issue or delivery of Partnership Common Units or
other securities or property in a name other than that of the holder of the
Class Six Partnership Preferred Units to be converted, and no such issue or
delivery shall be made unless and until the person requesting such issue or
delivery

                                      X-15

<PAGE>   17

has paid to the Partnership the amount of any such tax or established, to the
reasonable satisfaction of the Partnership, that such tax has been paid.

                  (j) In addition to any other adjustment required hereby, to
the extent permitted by law, the Partnership from time to time may decrease the
Conversion Price by any amount, permanently or for a period of at least twenty
Business Days, if the decrease is irrevocable during the period.

                  (k) For purposes of the definition of "Twelve-Month Period" in
the Agreement, any holder of Class Six Partnership Preferred Units that have
been converted to Partnership Common Units shall be deemed to have acquired such
Partnership Common Units when such Class Six Partnership Units were acquired.

         8.       Status of Reacquired Units.

         All Preferred Units which shall have been issued and reacquired in any
manner by the Partnership shall be deemed cancelled and no longer outstanding.

         9.       General.

         The ownership of the Preferred Units shall be evidenced by one or more
certificates in the form of Annex II hereto. The General Partner shall amend
Exhibit A to the Agreement from time to time to the extent necessary to reflect
accurately the issuance of, and subsequent redemption, or any other event having
an effect on the ownership of, the Preferred Units.

         10.      Allocations of Income and Loss.

         For each taxable year, each holder of Preferred Units will be allocated
a portion of the Net Income and Net Loss of the Partnership equal to the portion
of the Net Income and Net Loss of the Partnership that would be allocated to
such holder pursuant to Article 6 of the Agreement if such holder held a number
of Partnership Common Units equal to (i) the number of Preferred Units held by
such holder, multiplied by (ii) 0.5. Upon liquidation, dissolution or winding up
of the Partnership, the Partnership shall endeavor to allocate income and gain
to the holders of the Preferred Units such that the Capital Accounts related to
the Preferred Units are equal to their Liquidation Preference.

         11.      Voting Rights.

         Except as otherwise required by applicable law or in the Agreement, the
holders of the Preferred Units will have the same voting rights as holders of
the Partnership Common Units. As long as any Preferred Units are outstanding,
for purposes of determining the Consent of Limited Partners under the Agreement,
the "Majority In Interest of the Limited Partners" shall have the meaning set
forth in Section 2 hereof. As long as any Preferred Units are outstanding, in
addition to any other vote or consent of partners required by law or by the
Agreement, the affirmative vote or consent of holders of at least 50% of the
outstanding Preferred Units will be necessary for effecting any amendment of any
of the provisions of the Partnership Unit Designation of the Preferred Units
that materially and adversely affects the rights or preferences of the holders
of the Preferred Units. The creation or issuance of any class or series of
Partnership Units, including, without limitation, any Partnership Units that may
have rights junior to, on a parity with, or senior or superior to the Preferred
Units, will not be deemed to materially and adversely affect the rights or
preferences of the holders of Preferred Units.

                                      X-16

<PAGE>   18

With respect to the exercise of the above-described voting rights, each
Preferred Unit will have one (1) vote per Preferred Unit.

         12.      Restrictions on Transfer.

         Preferred Units are subject to the same restrictions on transfer
applicable to Common Units, as set forth in the Agreement.

                                      X-17

<PAGE>   19

                                                                         ANNEX I
                                                                    TO EXHIBIT X

                              NOTICE OF REDEMPTION

To:      AIMCO Properties, L.P.
         c/o AIMCO-GP, Inc.
         Colorado Center, Tower Two
         2000 South Colorado Boulevard, Suite 2-1000
         Denver, Colorado 80222
         Attention:  Investor Relations

                  The undersigned Limited Partner or Assignee hereby irrevocably
tenders for redemption Class Six Partnership Preferred Units in AIMCO
Properties, L.P. in accordance with the terms of the Agreement of Limited
Partnership of AIMCO Properties, L.P., dated as of July 29, 1994, as it may be
amended and supplemented from time to time (the "Agreement"). All capitalized
terms used herein and not otherwise defined shall have the respective meanings
ascribed thereto in the Partnership Unit Designation of the Class Six
Partnership Preferred Units. The undersigned Limited Partner or Assignee:

                  (a) if the Partnership elects to redeem such Class Six
         Partnership Preferred Units for Common Shares rather than cash, hereby
         irrevocably transfers, assigns, contributes and sets over to the
         Previous General Partner all of the undersigned Limited Partner's or
         Assignee's right, title and interest in and to such Class Six
         Partnership Preferred Units;

                  (b) undertakes (i) to surrender such Class Six Partnership
         Preferred Units and any certificate therefor at the closing of the
         Redemption contemplated hereby and (ii) to furnish to the Previous
         General Partner, prior to the Specified Redemption Date:

                           (1) A written affidavit, dated the same date as this
                  Notice of Redemption, (a) disclosing the actual and
                  constructive ownership, as determined for purposes of Code
                  Sections 856(a)(6) and 856(h), of Common Shares by (i) the
                  undersigned Limited Partner or Assignee and (ii) any Related
                  Party and (b) representing that, after giving effect to the
                  Redemption, neither the undersigned Limited Partner or
                  Assignee nor any Related Party will own Common Shares in
                  excess of the Ownership Limit;

                           (2) A written representation that neither the
                  undersigned Limited Partner or Assignee nor any Related Party
                  has any intention to acquire any additional Common Shares
                  prior to the closing of the Redemption contemplated hereby on
                  the Specified Redemption Date; and

                           (3) An undertaking to certify, at and as a condition
                  to the closing of the Redemption contemplated hereby on the
                  Specified Redemption Date, that either (a) the actual and
                  constructive ownership of Common Shares by the undersigned
                  Limited Partner or Assignee and any Related Party remain
                  unchanged from that disclosed in the affidavit required by
                  paragraph (1) above, or (b) after giving effect to the
                  Redemption contemplated hereby, neither the undersigned
                  Limited Partner or Assignee nor any

                                      X-I-1

<PAGE>   20

                  Related Party shall own Common Shares in violation of the
                  Ownership Limit.

                  (c) directs that the certificate representing the Common
         Shares, or the certified check representing the Cash Amount, in either
         case, deliverable upon the closing of the Redemption contemplated
         hereby be delivered to the address specified below;

                  (d) represents, warrants, certifies and agrees that:

                           (i) the undersigned Limited Partner or Assignee has,
                  and at the closing of the Redemption will have, good,
                  marketable and unencumbered title to such Preferred Units,
                  free and clear of the rights or interests of any other person
                  or entity;

                           (ii) the undersigned Limited Partner or Assignee has,
                  and at the closing of the Redemption will have, the full
                  right, power and authority to tender and surrender such
                  Preferred Units as provided herein; and

                           (iii) the undersigned Limited Partner or Assignee has
                  obtained the consent or approval of all persons and entities,
                  if any, having the right to consent to or approve such tender
                  and surrender.

Dated:
        ------------------

                                    Name of Limited Partner or Assignee:

                                    ----------------------------------------

                                    ----------------------------------------
                                    (Signature of Limited Partner or Assignee)

                                    -----------------------------------------
                                    (Street Address)

                                    -----------------------------------------
                                    (City)               (State)   (Zip Code)

                                    Signature Guaranteed by:

                                    ----------------------------------------

(continued on next page)

                                      X-I-2

<PAGE>   21

Issue check payable to
or Certificates in the
name of:
                       ------------------------------------------

Please insert social security
or identifying number:
                                    ----------------------------------------

NOTICE: THE SIGNATURE OF THIS NOTICE OF REDEMPTION MUST CORRESPOND WITH THE
NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE FOR THE CLASS SIX PREFERRED
UNITS WHICH ARE BEING REDEEMED IN EVERY PARTICULAR WITHOUT ALTERATION OR
ENLARGEMENT OR ANY CHANGE WHATEVER.

THE SIGNATURE SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION, (Banks,
Stockbrokers, Savings and Loan Associations and Credit Unions), WITH MEMBER SHIP
IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM PURSUANT TO SEC RULE
17Ad-15.

                                      X-I-3

<PAGE>   22

                                                                        ANNEX II
                                                                    TO EXHIBIT X

                            FORM OF UNIT CERTIFICATE
                                       OF
                      CLASS SIX PARTNERSHIP PREFERRED UNITS

[THE SECURITY EVIDENCED HEREBY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED (THE "ACT"), OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT
BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH
REGISTRATION, UNLESS THE TRANSFEROR DELIVERS TO THE PARTNERSHIP AN OPINION OF
COUNSEL SATISFACTORY TO THE PARTNERSHIP, IN FORM AND SUBSTANCE SATISFACTORY TO
THE PARTNERSHIP, TO THE EFFECT THAT THE PROPOSED SALE, TRANSFER OR OTHER
DISPOSITION MAY BE EFFECTED WITHOUT REGISTRATION UNDER THE ACT AND UNDER
APPLICABLE STATE SECURITIES OR "BLUE SKY" LAWS. IN ADDITION,](1) THE LIMITED
PARTNERSHIP INTEREST EVIDENCED BY THIS CERTIFICATE MAY BE SOLD OR OTHERWISE
TRANSFERRED ONLY IN COMPLIANCE WITH THE RESTRICTIONS ON TRANSFER SET FORTH IN
THE AGREEMENT OF LIMITED PARTNERSHIP OF AIMCO PROPERTIES, L.P., DATED AS OF JULY
29, 1994, AS IT MAY BE AMENDED AND/OR SUPPLEMENTED FROM TIME TO TIME, A COPY OF
WHICH MAY BE OBTAINED FROM AIMCO-GP, INC, THE GENERAL PARTNER, AT ITS PRINCIPAL
EXECUTIVE OFFICE.

                                                     Certificate Number
                                                                       --------

                             AIMCO PROPERTIES, L.P.
                 FORMED UNDER THE LAWS OF THE STATE OF DELAWARE

This certifies that
                    -----------------------------------------------------------
is the owner of
               ----------------------------------------------------------------

                      CLASS SIX PARTNERSHIP PREFERRED UNITS
                                       OF
                             AIMCO PROPERTIES, L.P.,

transferable on the books of the Partnership in person or by duly authorized
attorney on the surrender of this Certificate properly endorsed. This
Certificate and the Class Six Partnership Preferred Units represented hereby are
issued and shall be held subject to all of the provisions of the Agreement of
Limited Partnership of AIMCO Properties, L.P., as the same may be amended and/or
supplemented from time to time.

IN WITNESS WHEREOF, the undersigned has signed this Certificate.

Dated:                                           By
                                                   ----------------------------

----------

(1)      Not required if Units are issued pursuant to a current and effective
         registration statement under the Act.

                                     X-II-1

<PAGE>   23

                                   ASSIGNMENT

                      For Value Received, ____________________________ hereby
sells, assigns and transfers unto

_______________________________________________________________________________

______________________ Class Six Partnership Preferred Unit(s) represented by
the within Certificate, and does hereby irrevocably constitute and appoint the
General Partner of AIMCO Properties, L.P. as its Attorney to transfer said Class
Six Partnership Preferred Unit(s) on the books of AIMCO Properties, L.P. with
full power of substitution in the premises.

Dated:
      -----------------
                                           By:
                                              ---------------------------------
                                              Name:

                                           Signature Guaranteed by:

                                           ------------------------------------

NOTICE: THE SIGNATURE OF THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS
WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR WITHOUT ALTERATION
OR ENLARGEMENT OR ANY CHANGE WHATEVER.

THE SIGNATURE SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION, (Banks,
Stockbrokers, Savings and Loan Associations and Credit Unions), WITH MEMBER SHIP
IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM PURSUANT TO SEC RULE
17Ad-15.

                                     X-II-2

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