ALEXANDRIA REAL ESTATE EQUITIES, INC.

                             ARTICLES SUPPLEMENTARY

                  SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                  ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation
(the "Corporation"), hereby certifies to the State Department of Assessments
and Taxation of Maryland that:

                  FIRST: Under a power contained in Article VI, Section 6.3, of
the charter of the Corporation (the "Charter"), the Board of Directors of the
Corporation (the "Board of Directors"), by resolution duly adopted, classified
and designated 500,000 shares (the "Shares") of Preferred Stock (as defined in
the Charter) as shares of Series A Junior Participating Preferred Stock, $.01
par value per share (the "Series A Junior Participating Preferred Stock"), with
the preferences, conversion and other rights, voting powers, restrictions,
limitations as to dividends and other distributions, qualifications and terms
and conditions of redemption, subject in all cases to the provisions of Article
VII of the Charter, as set forth as follows, which upon any restatement of the
Charter shall be made part of Article VI, with any necessary or appropriate
changes to the enumeration or lettering of sections or subsections hereof. The
classification increases the number of shares classified as Series A Junior
Participating Preferred Stock from no shares immediately prior to the
classification to 500,000 shares immediately after the classification. The
classification decreases the number of shares of unclassified Preferred Stock
from 98,390,000 shares immediately prior to the classification to 97,890,000
shares immediately after the classification.

         SERIES A JUNIOR PARTICIPATING PREFERRED STOCK

                  Section 1. DESIGNATION AND AMOUNT. The shares of such series
shall be classified and designated as "Series A Junior Participating Preferred
Stock" and the number of shares constituting such series shall be 500,000.


                  Section 2.  DIVIDENDS AND DISTRIBUTIONS.

                  (A) Subject to the prior and superior rights of the holders of
any shares of any series of Preferred Stock ranking prior and superior to the
shares of Series A Junior Participating Preferred Stock with respect to
dividends, the holders of shares of Series A Junior Participating Preferred
Stock shall be entitled to receive, when, as and if authorized and declared by
the Board of Directors out of funds legally available for the purpose, quarterly
dividends payable in cash on or before the fifteenth (15th) day of January,
April, July and October in each year (each such date being referred to herein as
a "Quarterly Dividend Payment Date"), commencing on the first Quarterly Dividend
Payment Date after the first issuance of a share or fraction of a share of
Series A Junior Participating Preferred Stock, in an amount per share (rounded
to the nearest cent) equal to the greater of (a) $.01 or (b) subject to the
provision for adjustment hereinafter set forth, 100 times the aggregate per
share amount of all cash dividends, and 100 times the aggregate per share amount
(payable in kind) of all non-cash dividends or other distributions other than a
dividend payable in shares of Common Stock or a subdivision of the outstanding
shares of Common Stock (by reclassification or otherwise), declared on the
Common Stock, par value $.01 per share, of the Corporation (the "Common Stock")
since the immediately preceding Quarterly Dividend Payment Date, or, with
respect to the first Quarterly Dividend Payment Date, since the first issuance
of any share or fraction of a share of Series A Junior Participating Preferred
Stock. In the event the Corporation shall at any time after February 4, 2000
(the "Rights Declaration Date") (i) declare any dividend on Common Stock payable
in shares of Common Stock, (ii) subdivide the outstanding Common Stock, or (iii)
combine the outstanding Common Stock into a smaller number of shares, then in
each such case the amount to which holders of shares of Series A Junior
Participating Preferred Stock were entitled immediately prior to such event
under clause (b) of the preceding sentence shall be adjusted by multiplying such
amount by a fraction the numerator of which is the number of shares of Common
Stock outstanding immediately after such event and the denominator of which is
the number of shares of Common Stock that were outstanding immediately prior to
such event.

                  (B) The Corporation may not declare or pay a dividend or
distribution on the Common Stock (other than a dividend payable in shares of
the Common Stock) unless it simultaneously declares and pays a dividend or
distribution on the Series A Junior Participating Preferred Stock as provided in
Paragraph (A) above; provided that, in the event no dividend payable in shares
of or distribution shall have been declared on the Common Stock during the
period between any Quarterly


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Dividend Payment Date and the next subsequent Quarterly Dividend Payment Date, a
dividend of $.01 per share on the Series A Junior Participating Preferred Stock
shall nevertheless be payable on such subsequent Quarterly Dividend Payment
Date.

                  (C) Dividends shall begin to accrue and be cumulative on
outstanding shares of Series A Junior Participating Preferred Stock from the
Quarterly Dividend Payment Date next preceding the date of issue of such shares
of Series A Junior Participating Preferred Stock, unless the date of issue of
such shares is prior to the record date for the first Quarterly Dividend Payment
Date, in which case dividends on such shares shall begin to accrue from the date
of issue of such shares, or unless the date of issue is a Quarterly Dividend
Payment Date or is a date after the record date for the determination of holders
of shares of Series A Junior Participating Preferred Stock entitled to receive a
quarterly dividend and before such Quarterly Dividend Payment Date, in either of
which events such dividends shall begin to accrue and be cumulative from such
Quarterly Dividend Payment Date. Accrued but unpaid dividends shall not bear
interest. Dividends paid on the shares of Series A Junior Participating
Preferred Stock in an amount less than the total amount of such dividends at the
time accrued and payable on such shares shall be allocated pro rata on a
share-by-share basis among all such shares at the time outstanding. The Board of
Directors may fix a record date for the determination of holders of shares of
Series A Junior Participating Preferred Stock entitled to receive payment of a
dividend or distribution declared thereon, which record date shall be no more
than 30 days prior to the date fixed for the payment thereof.

                  Section 3.  VOTING RIGHTS.  The holders of shares of Series A
Junior Participating Preferred Stock shall have the following voting rights:

                  (A) Subject to the provision for adjustment hereinafter set
forth, each share of Series A Junior Participating Preferred Stock shall entitle
the holder thereof to 100 votes on all matters submitted to a vote of the
holders of Common Stock of the Corporation. In the event the Corporation shall
at any time after the Rights Declaration Date (i) declare any dividend on Common
Stock payable in shares of Common Stock, (ii) subdivide the outstanding Common
Stock, or (iii) combine the outstanding Common Stock into a smaller number of
shares, then in each such case the number of votes per share to which holders of
shares of Series A Junior Participating Preferred Stock were entitled
immediately prior to such event shall be adjusted by multiplying such number by
a fraction the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and


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the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

                  (B) Except as otherwise provided herein or by law, the holders
of shares of Series A Junior Participating Preferred Stock and the holders of
shares of Common Stock shall vote together as one class on all matters submitted
to a vote of stockholders of the Corporation.

                  (C)      (i) If at any time dividends on any Series A
         Junior Participating Preferred Stock shall be in arrears in an
         amount equal to six (6) quarterly dividends thereon, the occurrence
         of such contingency shall mark the beginning of a period (herein
         called a "default period") which shall extend until such time when
         all accrued and unpaid dividends for all previous quarterly dividend
         periods and for the current quarterly dividend period on all shares
         of Series A Junior Participating Preferred Stock then outstanding
         shall have been declared and paid or set apart for payment. During
         each default period, all holders of Preferred Stock (including
         holders of the Series A Junior Participating Preferred Stock) with
         dividends in arrears in an amount equal to six (6) quarterly
         dividends thereon, voting as a class, irrespective of series, shall
         have the right to elect two (2) directors.

                           (ii) During any default period, such voting right
         of the holders of Series A Junior Participating Preferred Stock may
         be exercised initially at a special meeting called pursuant to
         subparagraph (iii) of this Section 3(C) or at any annual meeting of
         stockholders, and thereafter at annual meetings of stockholders,
         provided that neither such voting right nor the right of the holders
         of any other series of Preferred Stock, if any, to increase in
         certain cases the authorized number of directors shall be exercised
         unless the holders of ten percent (10%) in number of shares of
         Series A Junior Participating Preferred Stock outstanding shall be
         present in person or by proxy. The absence of a quorum of the
         holders of Common Stock shall not affect the exercise by the holders
         of Series A Junior Participating Preferred Stock of such voting
         right. At any meeting at which the holders of Series A Junior
         Participating Preferred Stock shall exercise such voting right
         initially during an existing default period, they shall have the
         right, voting as a class, to elect directors to fill such vacancies,
         if any, in the Board of Directors as may then exist up to two (2)
         directors or, if such right is exercised at an annual meeting, to
         elect two (2) directors. If the number which may be so elected at any

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         special meeting does not amount to the required number, the holders of
         the Series A Junior Participating Preferred Stock shall have the right
         to make such increase in the number of directors as shall be necessary
         to permit the election by them of the required number. After the
         holders of the Series A Junior Participating Preferred Stock shall have
         exercised their right to elect directors in any default period and
         during the continuance of such period, the number of directors shall
         not be increased or decreased except by vote of the holders of Series A
         Junior Participating Preferred Stock as herein provided or pursuant to
         the rights of any equity securities ranking senior to or PARI PASSU
         with the Series A Junior Participating Preferred Stock.

                           (iii) Unless the holders of Series A Junior
         Participating Preferred Stock shall, during an existing default
         period, have previously exercised their right to elect directors, the
         Board of Directors may authorize, or any stockholder or stockholders
         owning in the aggregate not less than ten percent (10%) of the total
         number of shares of Series A Junior Participating Preferred Stock
         outstanding, may request, the calling of a special meeting of the
         holders of Series A Junior Participating Preferred Stock, which meeting
         shall thereupon be called by the President, a Vice-President or the
         Secretary of the Corporation. Notice of such meeting and of any annual
         meeting at which holders of Series A Junior Participating Preferred
         Stock are entitled to vote pursuant to this Paragraph (C)(iii) shall be
         given to each holder of record of Series A Junior Participating
         Preferred Stock by mailing a copy of such notice to such holder at its
         last address as the same appears on the books of the Corporation. Such
         meeting shall be called for a time not earlier than 20 days and not
         later than 60 days after such order or request or in default of the
         calling of such meeting within 60 days after such authorization or
         request, such meeting may be called on similar notice by any
         stockholder or stockholders owning in the aggregate not less than ten
         percent (10%) of the total number of shares of Series A Junior
         Participating Preferred Stock outstanding. Notwithstanding the
         provisions of this Paragraph (C)(iii), no such special meeting shall be
         called during the period within 60 days immediately preceding the date
         fixed for the next annual meeting of the stockholders.

                           (iv) In any default period, the holders of Common
         Stock, and other classes of stock of the Corporation if applicable,


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         shall continue to be entitled to elect the whole number of directors
         until the holders of Series A Junior Participating Preferred Stock
         shall have exercised their right to elect two (2) directors voting as a
         class, after the exercise of which right (x) the directors so elected
         by the holders of Series A Junior Participating Preferred Stock shall
         continue in office until their successors shall have been elected by
         such holders or until the expiration of the default period, and (y) any
         vacancy in the Board of Directors may (except as provided in Paragraph
         (C)(ii) of this Section 3) be filled by vote of a majority of the
         remaining directors theretofore elected by the holders of the class of
         stock which elected the director whose office shall have become vacant.
         References in this Paragraph (C) to directors elected by the holders
         of a particular class of stock shall include directors elected by such
         directors to fill vacancies as provided in clause (y) of the foregoing
         sentence.

                           (v) Immediately upon the expiration of a default
         period, (x) the right of the holders of Series A Junior Participating
         Preferred Stock as a class to elect directors shall cease, (y) the term
         of any directors elected by the holders of Series A Junior
         Participating Preferred Stock as a class shall terminate, and (z) the
         number of directors shall be such number as may be provided for in the
         charter or Bylaws irrespective of any increase made pursuant to the
         provisions of Paragraph (C)(ii) of this Section 3 (such number being
         subject, however, to change thereafter in any manner provided by law
         or in the charter or Bylaws). Any vacancies in the Board of Directors
         effected by the provisions of clauses (y) and (z) in the preceding
         sentence may be filled by a majority of the remaining directors.

                  (D) Except as set forth herein, holders of Series A Junior
Participating Preferred Stock shall have no special voting rights and their
consent shall not be required (except to the extent they are entitled to vote
with holders of Common Stock as set forth herein) for taking any corporate
action.

                  Section 4.  CERTAIN RESTRICTIONS.

                  (A) Whenever quarterly dividends or other dividends or
distributions payable on the Series A Junior Participating Preferred Stock as
provided in Section 2 are in arrears, thereafter and until all accrued and
unpaid dividends and distributions,


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whether or not declared, on shares of Series A Junior Participating Preferred
Stock outstanding shall have been paid in full, the Corporation shall not:

                                    (i)  declare or pay dividends on, make any
         other distributions on, or redeem or purchase or otherwise acquire for
         consideration any shares of stock ranking junior (either as to
         dividends or upon liquidation, dissolution or winding up) to the
         Series A Junior Participating Preferred Stock;

                                    (ii)  declare or pay dividends on or make
         any other distributions on any shares of stock ranking on a parity
         (either as to dividends or upon liquidation, dissolution or winding up)
         with the Series A Junior Participating Preferred Stock, except
         dividends paid ratably on the Series A Junior Participating Preferred
         Stock and all such parity stock on which dividends are payable or in
         arrears in proportion to the total amounts to which the holders of all
         such shares are then entitled;

                                    (iii)  redeem or purchase or otherwise
         acquire for consideration shares of any stock ranking on a parity
         (either as to dividends or upon liquidation, dissolution or winding up)
         with the Series A Junior Participating Preferred Stock, provided that
         the Corporation may at any time redeem, purchase or otherwise acquire
         shares of any such parity stock in exchange for shares of any stock of
         the Corporation ranking junior (either as to dividends or upon
         dissolution, liquidation or winding up) to the Series A Junior
         Participating Preferred Stock; or

                                    (iv)  purchase or otherwise acquire for
         consideration any shares of Series A Junior Participating Preferred
         Stock, or any shares of stock ranking on a parity with the Series A
         Junior Participating Preferred Stock, except in accordance with a
         purchase offer made in writing or by publication (as determined by the
         Board of Directors) to all holders of such shares upon such terms as
         the Board of Directors, after consideration of the respective annual
         dividend rates and other relative rights and preferences of the
         respective series and classes, shall determine in good faith will
         result in fair and equitable treatment among the respective series or
         classes.


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                  (B) The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the Corporation could, under Paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

                  Section 5. REACQUIRED SHARES. Any shares of Series A Junior
Participating Preferred Stock purchased or otherwise acquired by the Corporation
in any manner whatsoever shall become authorized but unissued shares of
Preferred Stock and may be reissued as part of a new series of Preferred Stock
to be created by resolution or resolutions of the Board of Directors, subject to
the conditions and restrictions on issuance set forth herein.

                  Section 6. LIQUIDATION, DISSOLUTION OR WINDING UP. (A) Upon
any liquidation (voluntary or otherwise), dissolution or winding up of the
Corporation, no distribution shall be made to the holders of shares of stock
ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series A Junior Participating Preferred Stock unless, prior
thereto, the holders of shares of Series A Junior Participating Preferred Stock
shall have received an amount equal to $100 per share of Series A Junior
Participating Preferred Stock, plus an amount equal to accrued and unpaid
dividends and distributions thereon, whether or not declared, to the date of
such payment (the "Series A Liquidation Preference"). Following the payment of
the full amount of the Series A Liquidation Preference, no additional
distributions shall be made to the holders of shares of Series A Junior
Participating Preferred Stock unless, prior thereto, the holders of shares of
Common Stock shall have received an amount per share (the "Common Adjustment")
equal to the quotient obtained by dividing (i) the Series A Liquidation
Preference by (ii) 100 (as appropriately adjusted as set forth in subparagraph
(C) below to reflect such events as stock splits, stock dividends and
recapitalizations with respect to the Common Stock) (such number in clause (ii),
the "Adjustment Number"). Following the payment of the full amount of the Series
A Liquidation Preference and the Common Adjustment in respect of all outstanding
shares of Series A Junior Participating Preferred Stock and Common Stock,
respectively, holders of Series A Junior Participating Preferred Stock and
holders of shares of Common Stock shall receive their ratable and proportionate
share of the remaining assets to be distributed in the ratio of the Adjustment
Number to 1 with respect to such Preferred Stock and Common Stock, on a per
share basis, respectively.

                  (B) In the event, however, that there are not sufficient
assets available to permit payment in full of the Series A Liquidation
Preference and the liquidation preferences of all other series of preferred
stock, if any, which rank on a parity with


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the Series A Junior Participating Preferred Stock, then such remaining assets
shall be distributed ratably to the holders of such parity shares in proportion
to their respective liquidation preferences. In the event, however, that there
are not sufficient assets available to permit payment in full of the Common
Adjustment, then such remaining assets shall be distributed ratably to the
holders of Common Stock.

                  (C) In the event the Corporation shall at any time after the
Rights Declaration Date (i) declare any dividend on Common Stock payable in
shares of Common Stock, (ii) subdivide the outstanding Common Stock, or (iii)
combine the outstanding Common Stock into a smaller number of shares, then in
each such case the Adjustment Number in effect immediately prior to such event
shall be adjusted by multiplying such Adjustment Number by a fraction the
numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                  (D) In determining whether a distribution (other than upon
voluntary or involuntary liquidation) by dividend, redemption or other
acquisition of shares of stock of the Corporation or otherwise is permitted
under the Maryland General Corporation Law, no effect shall be given to amounts
that would be needed, if the Corporation were to be dissolved at the time of the
distribution, to satisfy the preferential rights upon dissolution of holders of
shares of stock of the Company whose preferential rights upon dissolution are
superior to those receiving the distribution.

                  Section 7. CONSOLIDATION, MERGER, ETC. In case the Corporation
shall enter into any consolidation, merger, combination or other transaction in
which the shares of Common Stock are exchanged for or changed into other stock
or securities, cash and/or any other property, then in any such case the shares
of Series A Junior Participating Preferred Stock shall at the same time be
similarly exchanged or changed in an amount per share (subject to the provision
for adjustment hereinafter set forth) equal to 100 times the aggregate amount of
stock, securities, cash and/or any other property (payable in kind), as the case
may be, into which or for which each share of Common Stock is changed or
exchanged. In the event the Corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount set forth in the preceding sentence with respect to the exchange or
change of shares of Series A Junior Participating Preferred Stock shall be
adjusted by multiplying such amount by a fraction the


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numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                  Section 8. NO REDEMPTION.  The shares of Series A Junior
Participating Preferred Stock shall not be redeemable.

                  Section 9. RANKING. The Series A Junior Participating
Preferred Stock shall rank junior to all other series of the Corporation's
Preferred Stock as to the payment of dividends and the distribution of
assets, unless the terms of any such series shall provide otherwise.

                  Section 10. AMENDMENT. At any time when any shares of
Series A Junior Participating Preferred Stock are outstanding, the Charter,
including the terms of these Articles Supplementary, shall not be amended in
any manner which would materially alter or change the powers, preferences or
special rights of the Series A Junior Participating Preferred Stock so as to
affect them adversely without the affirmative vote of the holders of a
majority or more of the outstanding shares of Series A Junior Participating
Preferred Stock, voting separately as a class.

                  Section 11. FRACTIONAL SHARES. Series A Junior
Participating Preferred Stock may be issued in fractions of a share which
shall entitle the holder, in proportion to such holder's fractional shares,
to exercise voting rights, receive dividends, participate in distributions
and to have the benefit of all other rights of holders of Series A Junior
Participating Preferred Stock.

                  SECOND:  The Shares have been classified and designated by the
Board of Directors under the authority contained in the Charter.

                  THIRD:  These Articles Supplementary have been approved by the
Board of Directors in the manner and by the vote required by law.

                  FOURTH: The undersigned Senior Vice President of the
Corporation acknowledges these Articles Supplementary to be the corporate act of
the Corporation and, as to all matters or facts required to be verified under
oath, the undersigned Senior Vice President acknowledges that to the best of her
knowledge, information and belief, these matters and facts are true in all
material respects and that this statement is made under the penalties for
perjury.


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                  IN WITNESS WHEREOF, ALEXANDRIA REAL ESTATE EQUITIES, INC. has
caused these Articles Supplementary to be signed in its name and on its behalf
by its Senior Vice President and attested to by its Secretary on February 10,
2000.

                                          ALEXANDRIA REAL ESTATE
                                          EQUITIES, INC.



                                          By: /s/ Peter J. Nelson
                                             -----------------------------------
                                               Name:  Peter J. Nelson
                                               Title:  Senior Vice President


Attest:

/s/ Laurie A. Allen
- --------------------------------
Laurie A. Allen, Secretary


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