ARDEN REALTY GROUP INC
S-11, 1996-07-16
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 16, 1996
 
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
 
                                   FORM S-11
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                              -------------------
 
                            ARDEN REALTY GROUP, INC.
      (Exact Name of Registrant as Specified in its Governing Instruments)
                              -------------------
 
                            9100 Wilshire Boulevard
                             East Tower, Suite 700
                        Beverly Hills, California 90212
                                 (310) 271-8600
                    (Address of principal executive offices)
 
                            ------------------------
 
                                Richard S. Ziman
                            9100 Wilshire Boulevard
                             East Tower, Suite 700
                        Beverly Hills, California 90212
                                 (310) 271-8600
                    (Name and Address of Agent for Service)
 
                            ------------------------
 
                                   COPIES TO:
 
          William J. Cernius                      J. Warren Gorrell, Jr.
           Latham & Watkins                      Joseph G. Connolly, Jr.
        650 Town Center Drive                     Hogan & Hartson L.L.P.
              Suite 2000                             Columbia Square
     Costa Mesa, California 92626              555 Thirteenth Street, N.W.
            (714) 540-1235                     Washington, D.C. 20004-1109
                                                      (202) 637-5600
 
                              -------------------
 
    APPROXIMATE  DATE OF COMMENCEMENT OF THE  PROPOSED SALE OF THE SECURITIES TO
THE PUBLIC: As  soon as  practicable after this  Registration Statement  becomes
effective.
 
    If  this Form  is filed  to register  additional securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration statement  number  of  the  earlier
effective registration statement for the same offering.  / /  ________________.
 
    If  this Form  is a post-effective  amendment filed pursuant  to Rule 462(c)
under the Securities Act,  check the following box  and list the Securities  Act
registration  statement number  of the earlier  effective registration statement
for the same offering.  / /  ________________.
 
    If delivery of the prospectus is expected  to be made pursuant to Rule  434,
please check the following box.  / /
                              -------------------
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
 TITLE OF EACH CLASS OF                                   PROPOSED MAXIMUM           PROPOSED MAXIMUM
    SECURITIES TO BE             AMOUNT TO BE              OFFERING PRICE           AGGREGATE OFFERING             AMOUNT OF
       REGISTERED               REGISTERED(1)               PER SHARE(2)                 PRICE(2)               REGISTRATION FEE
<S>                        <C>                        <C>                        <C>                        <C>
Common Stock, $.01 par
  value per share.......          21,533,000                   $20.00                  $430,660,000                 $148,504
</TABLE>
 
(1) Includes 2,808,000 shares which the Underwriters have the option to purchase
    solely to cover overallotments, if any.
(2) Estimated solely for the purpose of calculating the registration fee.
 
                            ------------------------
 
    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT  SHALL THEREAFTER BECOME EFFECTIVE IN  ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT  OF 1933  OR UNTIL  THE REGISTRATION  STATEMENT SHALL  BECOME
EFFECTIVE  ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                             CROSS REFERENCE SHEET
 
                   FORM S-11
             ITEM NO. AND HEADING                 LOCATION IN PROSPECTUS
      -----------------------------------   -----------------------------------
 1.   Forepart of Registration Statement
      and Outside Front Cover Page of
      Prospectus.........................   Outside Front Cover Page
 2.   Inside Front and Outside Back Cover
      Pages of Prospectus................   Inside Front Cover Page; Outside
                                            Back Cover Page; Additional
                                            Information
 3.   Summary Information and Risk
      Factors............................   Outside Front Cover Page;
                                            Prospectus Summary; Risk Factors;
                                            The Company
 4.   Determination of Offering Price....   Outside Front Cover Page;
                                            Underwriting
 5.   Dilution...........................   Dilution
 6.   Selling Security Holders...........   Not Applicable
 7.   Plan of Distribution...............   Outside Front Cover Page;
                                            Underwriting
 8.   Use of Proceeds....................   Use of Proceeds; Business and
                                            Properties
 9.   Selected Financial Data............   Selected Combined Financial Data
10.   Management's Discussion and
      Analysis of Financial Condition and
      Results of Operations..............   Management's Discussion and
                                            Analysis of Financial Condition and
                                            Results of Operations
11.   General Information as to
      Registrant.........................   Prospectus Summary; The Company;
                                            Formation Transactions
12.   Policy with Respect to Certain
      Activities.........................   Policies and Objectives With
                                            Respect to Certain Activities
13.   Investment Policies of
      Registrant.........................   Policies and Objectives With
                                            Respect to Certain Activities
14.   Description of Real Estate.........   Prospectus Summary; Business and
                                            Properties
15.   Operating Data.....................   Business and Properties
16.   Tax Treatment of Registrant and its
      Security Holders...................   Prospectus Summary; Federal Income
                                            Tax Considerations
17.   Market Price of and Dividends on
      the Registrant's Common Equity and
      Related Stockholder Matters........   Distribution Policy; Shares
                                            Available for Future Sale; Capital
                                            Stock
18.   Description of Registrant's
      Securities.........................   Capital Stock
19.   Legal Proceedings..................   Business and Properties -- Legal
                                            Proceedings
20.   Security Ownership of Certain
      Beneficial Owners and Management...   Principal Stockholders
21.   Directors and Executive Officers...   Management
22.   Executive Compensation.............   Management -- Executive
                                            Compensation
23.   Certain Relationships and Related
      Transactions.......................   Management; Formation Transactions;
                                            Certain Transactions
24.   Selection, Management and Custody
      of Registrant's Investments........   Risk Factors; The Company; Policies
                                            and Objectives With Respect to
                                            Certain Activities
25.   Policies with Respect to Certain
      Transactions.......................   Risk Factors; Policies and
                                            Objectives With Respect to Certain
                                            Activities; Certain Transactions
26.   Limitations of Liability...........   Capital Stock -- Charter and Bylaw
                                            Provisions
27.   Financial Statements and
      Information........................   Prospectus Summary; Selected
                                            Combined Financial Data; Financial
                                            Statements
28.   Interests of Named Experts and
      Counsel............................   Experts; Legal Matters
29.   Disclosure of Commission Position
      on Indemnification for Securities
      Act Liabilities....................   Capital Stock -- Charter and Bylaw
                                            Provisions; Underwriting
<PAGE>
Information   contained  herein  is  subject   to  completion  or  amendment.  A
registration statement  relating to  these securities  has been  filed with  the
Securities  and Exchange  Commission. These securities  may not be  sold nor may
offers to buy be accepted prior  to the time the registration statement  becomes
effective.  This  prospectus  shall  not  constitute an  offer  to  sell  or the
solicitation of an offer to buy nor shall there by any sale of these  securities
in  any State in which such offer,  solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
<PAGE>
                   Subject to Completion, dated July 16, 1996
PROSPECTUS
                               18,725,000 SHARES
 
                            ARDEN REALTY GROUP, INC.
                                  COMMON STOCK
                                ----------------
 
    Arden Realty Group, Inc. (the "Company") is a Maryland corporation which has
been formed to  continue and  expand the real  estate business  of Arden  Realty
Group, Inc., a California corporation ("Arden"), and certain affiliated entities
(collectively, the "Arden Predecessors") which are engaged in owning, acquiring,
managing,  leasing and renovating office properties in Southern California. Upon
completion of the  offering (the  "Offering"), the  Company will  own 24  office
properties  (the  "Properties")  containing approximately  4.0  million rentable
square feet. All of the Properties  are located in Southern California, with  21
in  suburban  Los Angeles  County, two  in Orange  County and  one in  San Diego
County.  The  Company  will  be   a  fully  integrated,  self-administered   and
self-managed  real  estate  company and  expects  to  qualify as  a  real estate
investment trust ("REIT") for federal  income tax purposes. The Company  intends
to  pay regular  quarterly distributions  to its  stockholders beginning  with a
distribution for the period ending December 31, 1996.
 
    All of the shares of  the Company's common stock,  par value $.01 per  share
(the  "Common Stock"),  offered hereby  are being sold  by the  Company and will
represent approximately 87.37% of all outstanding shares of the Company's Common
Stock (or interests exchangeable for Common Stock). The remaining  approximately
12.63%  of the equity in  the Company will be held  by officers and directors of
the Company (11.83%) and  certain other parties which  owned direct or  indirect
interests in certain of the Properties immediately prior to the Offering (.80%).
The  equity held by  such parties will  be in the  form of partnership interests
("OP Units")  of Arden  Realty  Group Limited  Partnership, a  Maryland  limited
partnership  (the "Operating Partnership").  To assist the  Company in complying
with certain  qualification  requirements  applicable to  REITs,  the  Company's
charter  provides that  no stockholder or  group of  affiliated stockholders may
actually or constructively own more than  9.0% of the outstanding Common  Stock,
subject  to certain specified exceptions. See  "Capital Stock -- Restrictions on
Transfer."
 
    Prior to the Offering, there has been no public market for the Common Stock.
It is currently estimated that the initial public offering price will be  $20.00
per  share. See  "Underwriting" for  information relating  to the  factors to be
considered in determining the  initial public offering  price. The Common  Stock
has  been  approved for  listing  on the  New  York Stock  Exchange,  subject to
official notice of issuance, under the symbol "ARI."
 
    SEE "RISK FACTORS" BEGINNING ON PAGE  18 FOR CERTAIN FACTORS RELEVANT TO  AN
INVESTMENT IN THE COMMON STOCK, INCLUDING:
    - The  possibility that the consideration to be  paid by the Company for the
      Properties and other assets  contributed to the  Company may exceed  their
      fair market value;
    - Risks  generally associated with borrowing, including the possibility that
      the Company may not  be able to refinance  outstanding debt upon  maturity
      (initially $104 million);
    - Risks  generally  associated  with  real  estate  investment  and property
      management such as  the need  to renew leases  or relet  space upon  lease
      expirations,  the instability  of cash flows  and changes in  the value of
      office  properties  owned  by  the  Company  due  to  economic  and  other
      conditions;
    - Concentration of the Properties in Southern California which increases the
      risk of the Company being adversely affected by a downturn in the Southern
      California economy or office markets;
    - Conflicts  of interest in connection with the transactions relating to the
      formation of the Company;
    - Risks associated  with acquiring  new properties,  including the  lack  of
      operating  history  under the  Company's management  of the  most recently
      acquired Properties;
    - Taxation of the Company as a regular corporation if it fails to qualify as
      a REIT, taxation of the Operating Partnership as a corporation if it fails
      to qualify as a partnership and  the resulting decrease in cash  available
      for distribution; and
    - Risks that certain types of losses, such as from earthquakes, could exceed
      the Company's insurance coverage.
 
THESE  SECURITIES  HAVE  NOT  BEEN APPROVED  OR  DISAPPROVED  BY  THE SECURITIES
    AND   EXCHANGE   COMMISSION   OR   ANY   STATE   SECURITIES   COMMISSION
       NOR  HAS  THE  SECURITIES  AND EXCHANGE  COMMISSION  OR  ANY STATE
          SECURITIES  COMMISSION   PASSED   UPON   THE   ACCURACY   OR
             ADEQUACY   OF  THIS   PROSPECTUS.  ANY  REPRESENTATION
                        TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                      Price to           Underwriting Discounts         Proceeds to
                                                       Public             and Commissions (1)           Company (2)
<S>                                           <C>                       <C>                       <C>
Per Share...................................             $                         $                         $
Total (3)...................................             $                         $                         $
</TABLE>
 
(1) The Company has agreed to indemnify the several Underwriters against certain
    liabilities, including  liabilities under  the Securities  Act of  1933,  as
    amended. See "Underwriting."
(2) Before deducting estimated expenses of $         payable by the Company.
(3)  The Company has granted the Underwriters  a 30-day option to purchase up to
    2,808,000 additional shares of Common Stock on the same terms and conditions
    as set forth above solely to cover overallotments, if any. If such option is
    exercised in full,  the total  Price to Public,  Underwriting Discounts  and
    Commissions  and Proceeds to  Company will be $            , $           and
    $         , respectively. See "Underwriting."
 
    The shares of  Common Stock offered  by this Prospectus  are offered by  the
Underwriters  subject to prior sale, to withdrawal, cancellation or modification
of the offer without notice, to  delivery to and acceptance by the  Underwriters
and  to certain further conditions.  It is expected that  delivery of the shares
will be made at the  offices of Lehman Brothers Inc.,  New York, New York on  or
about            , 1996.
 
                          ---------------------------
LEHMAN BROTHERS
 
                 ALEX. BROWN & SONS
                        INCORPORATED
 
                                     DEAN WITTER REYNOLDS INC.
                                                               SMITH BARNEY INC.
 
EVEREN SECURITIES, INC.                         RAYMOND JAMES & ASSOCIATES, INC.
 
           , 1996
<PAGE>
    THE  ATTORNEY GENERAL OF THE STATE OF NEW YORK HAS NOT PASSED ON OR ENDORSED
THE MERITS OF THIS OFFERING. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL.
 
    IN CONNECTION WITH THIS OFFERING,  THE UNDERWRITERS MAY OVERALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A  LEVEL  ABOVE THAT  WHICH MIGHT  OTHERWISE  PREVAIL IN  THE OPEN  MARKET. SUCH
TRANSACTIONS  MAY  BE  EFFECTED  ON  THE   NEW  YORK  STOCK  EXCHANGE,  IN   THE
OVER-THE-COUNTER  MARKET OR  OTHERWISE. SUCH  STABILIZING, IF  COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
                                [Graphics--To Come]
 
                                       2
<PAGE>
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
PROSPECTUS SUMMARY........................................................    1
  The Company.............................................................    1
  Risk Factors............................................................    3
  Business and Growth Strategies..........................................    4
  Southern California Economy and Office Markets..........................    6
  Overview................................................................    6
  Declining Unemployment Rates and Increasing Employment..................    6
  Improving Office Markets................................................    7
  The Properties..........................................................    8
  Structure and Formation of the Company..................................   10
  Financing Policies......................................................   14
  Mortgage Financing and Credit Facility..................................   14
  The Offering............................................................   15
  Distributions...........................................................   15
  Tax Status of the Company...............................................   15
  Summary Selected Combined Financial Data................................   16
 
RISK FACTORS..............................................................   18
  Price to be Paid for Properties and Other Assets May Exceed Their Fair
   Market Value...........................................................   18
  Real Estate Financing Risks.............................................   18
  Real Estate Investment Risks............................................   19
  Geographic Concentration................................................   20
  Conflicts of Interests in the Formation Transactions and the Business of
   the Company............................................................   20
  Risk Associated with the Recent Acquisition of Many of the New
   Properties; Lack of Operating History..................................   22
  Risk of Acquisition, Renovation and Development Activities..............   22
  Adverse Consequences of Failure to Qualify as a REIT; Other Tax
   Liabilities............................................................   23
  Failure of the Operating Partnership to Qualify as a Partnership for
   Federal Income Tax Purposes............................................   23
  Insurance...............................................................   24
  No Limitation on Debt...................................................   24
  Dependence on Key Personnel.............................................   24
  Limits on Changes in Control............................................   24
  Historical Losses.......................................................   26
  Possible Environmental Liabilities......................................   26
  Effect on Common Stock Price of Shares Available for Future Sale........   27
  Immediate and Substantial Dilution......................................   27
 
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
  Absence of Prior Public Market for Common Stock.........................   27
  Changes in Policies Without Stockholder Approval........................   28
  Influence of Executive Officers, Directors and Principal Stockholders...   28
  Risks of Fee Management Business........................................   28
  Effect of Market Interest Rates on Price of Common Stock................   28
 
THE COMPANY...............................................................   29
 
BUSINESS AND GROWTH STRATEGIES............................................   31
  Business Strategies.....................................................   31
  Growth Strategies.......................................................   32
 
USE OF PROCEEDS...........................................................   35
  Mortgage Debt to be Repaid..............................................   36
 
DISTRIBUTIONS.............................................................   36
 
CAPITALIZATION............................................................   41
 
DILUTION..................................................................   42
 
SELECTED COMBINED FINANCIAL DATA..........................................   43
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
 OPERATIONS...............................................................   45
  Overview................................................................   45
  Results of Operations...................................................   45
  Pro Forma Operating Results.............................................   50
  Liquidity and Capital Resources.........................................   51
  Cash Flows..............................................................   52
  Inflation...............................................................   52
 
SOUTHERN CALIFORNIA ECONOMY AND OFFICE MARKETS............................   53
  Southern California Economy.............................................   53
  Southern California Office Markets......................................   55
 
BUSINESS AND PROPERTIES...................................................   58
  General.................................................................   58
  Properties..............................................................   58
  Tenants.................................................................   60
  Tenant Diversification..................................................   60
  Lease Expirations.......................................................   61
  Tenant Retention and Expansions.........................................   61
  Historical Tenant Improvements and Leasing Commissions..................   62
  Historical Capital Expenditures.........................................   63
</TABLE>
 
                                       i
<PAGE>
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
  Historical Occupancy....................................................   63
  Office Submarkets and Property Information..............................   64
  Los Angeles County Office Market and Properties.........................   65
  Los Angeles West Office Market Sector...................................   66
  Los Angeles North Office Market Sector..................................   71
  Los Angeles South Office Market Sector..................................   75
  Orange County Office Market and Properties..............................   77
  San Diego County Office Market and Property.............................   79
  C&W Market Study........................................................   81
  Competition.............................................................   82
  Insurance...............................................................   82
  Environmental Regulations...............................................   82
  Legal Proceedings.......................................................   83
  Employees...............................................................   83
 
MANAGEMENT................................................................   84
  Directors and Executive Officers........................................   84
  Committees of the Board of Directors....................................   86
  Compensation of Directors...............................................   86
  Executive Compensation..................................................   86
  Employment Agreements...................................................   86
  Stock Incentive Plan....................................................   86
  401(k) Plan.............................................................   86
  Limitation of Liability and Indemnification.............................   88
 
STRUCTURE AND FORMATION OF THE COMPANY....................................   89
  The Operating Entities of the Company...................................   89
  The Formation Transactions..............................................   90
  Consequences of the Offering and the Formation Transactions.............   91
  Determination and Valuation of Ownership Interests......................   91
  Benefits of the Formation Transactions and the Offering to Affiliates of
   the Company............................................................   92
 
POLICIES WITH RESPECT TO CERTAIN TRANSACTIONS.............................   93
  Investment Policies.....................................................   93
  Dispositions............................................................   93
  Financing Policies......................................................   94
  Conflict of Interest Policies...........................................   95
  Policies with Respect to Other Activities...............................   96
 
CERTAIN TRANSACTIONS......................................................   96
  Formation Transactions..................................................   96
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
  Partnership Agreement; Redemption/ Exchange Rights......................   96
  Registration Rights.....................................................   96
 
PARTNERSHIP AGREEMENT.....................................................   97
  Management..............................................................   97
  Transferability of Interests............................................   97
  Capital Contributions...................................................   97
  Redemption/Exchange Rights..............................................   97
  Issuance of Additional OP Units/ Common Stock...........................   98
  Tax Matters.............................................................   98
  Operations..............................................................   98
  Duties and Conflicts....................................................   98
  Term....................................................................   98
  Indemnification.........................................................   98
 
PRINCIPAL STOCKHOLDERS....................................................   99
 
CAPITAL STOCK.............................................................  100
  General.................................................................  100
  Common Stock............................................................  100
  Preferred Stock.........................................................  100
  Power to Issue Additional Shares of Common Stock and Preferred Stock....  101
  Transfer Agent and Registrar............................................  101
  Restrictions on Transfer................................................  101
 
CERTAIN PROVISIONS OF MARYLAND LAW AND THE COMPANY'S CHARTER AND BYLAWS...  103
  Board of Directors - Number, Classification, Vacancies..................  103
  Removal of Directors....................................................  103
  Business Combinations...................................................  104
  Control Share Acquisitions..............................................  104
  Amendment to the Charter................................................  105
  Dissolution of the Company..............................................  105
  Advance Notice of Director Nominations and New Business.................  105
  Anti-takeover Effect of Certain Provisions of Maryland Law and of the
   Charter and Bylaws.....................................................  105
  Rights to Purchase Securities and Other Property........................  105
 
SHARES AVAILABLE FOR FUTURE SALE..........................................  106
  General.................................................................  106
  Registration Rights.....................................................  107
 
FEDERAL INCOME TAX CONSIDERATIONS.........................................  107
  Taxation of the Company.................................................  107
</TABLE>
 
                                       ii
<PAGE>
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
  Failure to Qualify......................................................  112
  Taxation of Taxable U.S. Stockholders Generally.........................  112
  Backup Withholding......................................................  113
  Taxation of Tax-Exempt Stockholders.....................................  113
  Taxation of Non-U.S. Stockholders.......................................  114
  Tax Aspects of the Operating Partnership................................  116
  Other Tax Consequences..................................................  118
 
ERISA CONSIDERATIONS......................................................  118
  Employment Benefit Plans, Tax-Qualified Pension, Profit Sharing or Stock
   Bonus Plans and IRAs...................................................  119
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
  Status of the Company and the Operating Partnership under ERISA.........  119
 
UNDERWRITING..............................................................  121
 
EXPERTS...................................................................  122
 
LEGAL MATTERS.............................................................  123
 
ADDITIONAL INFORMATION....................................................  123
 
GLOSSARY..................................................................  124
</TABLE>
 
                              CAUTIONARY STATEMENT
 
    INFORMATION   CONTAINED   IN  THIS   PROSPECTUS   CONTAINS  "FORWARD-LOOKING
STATEMENTS" WITHIN THE MEANING OF  THE PRIVATE SECURITIES LITIGATION REFORM  ACT
OF  1995, WHICH CAN BE IDENTIFIED BY THE USE OF FORWARD-LOOKING TERMINOLOGY SUCH
AS "MAY," "WILL," "SHOULD," "EXPECT," "ANTICIPATE," "ESTIMATE" OR "CONTINUE"  OR
THE  NEGATIVE THEREOF OR OTHER VARIATIONS THEREON OR COMPARABLE TERMINOLOGY. THE
CAUTIONARY STATEMENTS SET FORTH UNDER  THE CAPTION "RISK FACTORS" AND  ELSEWHERE
IN   THE   PROSPECTUS  IDENTIFY   IMPORTANT   FACTORS  WITH   RESPECT   TO  SUCH
FORWARD-LOOKING STATEMENTS,  INCLUDING  CERTAIN RISKS  AND  UNCERTAINTIES,  THAT
COULD   CAUSE  ACTUAL   RESULTS  TO  DIFFER   MATERIALLY  FROM   THOSE  IN  SUCH
FORWARD-LOOKING STATEMENTS.
 
                                      iii
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION AND  FINANCIAL STATEMENTS  APPEARING ELSEWHERE  IN THIS  PROSPECTUS.
UNLESS INDICATED OTHERWISE, THE INFORMATION CONTAINED IN THIS PROSPECTUS ASSUMES
THAT  (I)  THE INITIAL  PUBLIC  OFFERING PRICE  IS  $20.00 PER  SHARE,  (II) THE
UNDERWRITERS' OVERALLOTMENT  OPTION IS  NOT  EXERCISED, (III)  THE  TRANSACTIONS
DESCRIBED  ELSEWHERE IN  THIS PROSPECTUS UNDER  "STRUCTURE AND  FORMATION OF THE
COMPANY" ARE CONSUMMATED AND (IV) NONE OF  THE OP UNITS REDEEMABLE FOR CASH  OR,
AT  THE ELECTION  OF THE  COMPANY, EXCHANGEABLE  FOR COMMON  STOCK HAVE  BEEN SO
REDEEMED OR EXCHANGED. ALTHOUGH  THE COMPANY AND  THE OPERATING PARTNERSHIP  ARE
SEPARATE  ENTITIES,  FOR  EASE OF  REFERENCE  AND UNLESS  THE  CONTEXT OTHERWISE
REQUIRES, ALL  REFERENCES IN  THIS  PROSPECTUS TO  THE  "COMPANY" REFER  TO  THE
COMPANY  AND  THE OPERATING  PARTNERSHIP, COLLECTIVELY.  ALL REFERENCES  IN THIS
PROSPECTUS TO THE HISTORICAL ACTIVITIES OF  THE COMPANY REFER TO THE  ACTIVITIES
OF  THE ARDEN PREDECESSORS. SEE "GLOSSARY"  FOR THE DEFINITIONS OF CERTAIN TERMS
USED IN  THIS  PROSPECTUS,  INCLUDING  CAPITALIZED  TERMS  USED  HEREIN  WITHOUT
DEFINITION.
 
                                  THE COMPANY
 
    The  Company has been formed to continue and expand the real estate business
of Arden Realty  Group, Inc.,  a California corporation  ("Arden"), and  certain
affiliated  entities (collectively, the "Arden  Predecessors") which are engaged
in owning,  acquiring, managing,  leasing and  renovating office  properties  in
Southern  California. The  Company's founders,  Richard S.  Ziman and  Victor J.
Coleman, along  with the  other five  senior officers  at the  Company, have  an
average  of more  than 18  years of experience  in the  Southern California real
estate industry. Upon completion of the Offering, the Company will own 24 office
properties (the  "Properties")  containing approximately  4.0  million  rentable
square  feet. All of the Properties are  located in Southern California, with 21
in suburban  Los Angeles  County, two  in Orange  County and  one in  San  Diego
County.  As of April 30,  1996, the Properties had  a weighted average occupancy
rate of approximately 88%.  Arden currently manages 22  of the Properties.  Upon
completion  of the Offering, the  Company will manage all  of the Properties and
four additional properties containing approximately 325,000 rentable square feet
which are  currently managed  by  Arden for  institutional investors  and  other
third-party  owners. The Company  will be a  fully integrated, self-administered
and self-managed  real estate  company and  expects  to qualify  as a  REIT  for
federal income tax purposes.
 
    The  Company  believes that  all  of the  Properties  are located  in strong
submarkets which  generally  have  significant  rent  growth  potential  due  to
employment  growth, declining  vacancy rates, limited  new construction activity
and existing rental rates at levels  significantly below those required to  make
new  construction economically  feasible. The  Company's portfolio  is comprised
primarily of Class A suburban office properties. The Company generally considers
Class A suburban office  properties to be those  which have desirable  locations
and  high quality finishes,  are well maintained  and professionally managed and
are capable of achieving  rental and occupancy rates  which are typically  above
those prevailing in their respective markets. Of the Company's 24 Properties, 20
Properties  have been  built since  1980 and  14 Properties,  including all four
built prior to  1980, have been  substantially renovated within  the last  three
years.  The Properties  are leased to  over 540  tenants which engage  in a wide
variety of businesses, including financial services, entertainment, health  care
services,  accounting, law, computer technology, education and publishing. Major
tenants in  the  Company's portfolio,  based  on square  feet  leased,  include:
Merrill  Lynch, Hewlett  Packard, Deloitte  & Touche,  GTE California, McDonnell
Douglas, Pepperdine  University,  Grey  Advertising, Earth  Technology  and  The
Hearst  Corporation. As of April  30, 1996, no single  tenant accounted for more
than approximately  3.5% of  the  aggregate Adjusted  Annualized Base  Rent  (as
defined  herein) of  the Company's  portfolio and  only 16  tenants individually
represented more than 1% of such aggregate Adjusted Annualized Base Rent.
 
    The  Company  believes  that  certain  economic  fundamentals  in   Southern
California provide an attractive environment for owning, acquiring and operating
Class A suburban office properties:
 
    - According  to AMERICA'S  OFFICE ECONOMY  prepared by  Cognetics, Inc., Los
      Angeles County, in which 21 of the Company's 24 Properties are located, is
      the number one market in the  United States for primary office  employment
      growth;
<PAGE>
    - According  to statistics released by the  U.S. Bureau of Labor Statistics,
      the unemployment rate in the  Los Angeles/Long Beach Primary  Metropolitan
      Statistical  Area  (the  "Los  Angeles  PMSA"),  in  which  21  of  the 24
      Properties are located,  has decreased  significantly over  the past  four
      years, falling from an average of 9.8% during 1992 to 7.9% during 1995;
 
    - The  Economic  Development Corporation  of  Los Angeles  County  (the "Los
      Angeles EDC") has forecast nonfarm employment growth rates of 2.1% in 1996
      and 1997 in Los Angeles County;
 
    - The Los Angeles EDC has also forecast that economic activity will increase
      twice as fast in Los Angeles County  than in the nation as a whole  during
      1996  and 1997, with inflation-adjusted gross product growing at a rate of
      5.2% and 5% in  Los Angeles County  as compared to 2.5%  and 2.4% for  the
      nation as a whole; and
 
    - Since  1992,  there  has  been very  limited  construction  of  new office
      properties in the  Southern California region.  The Company believes  that
      this  limited  construction of  office properties  coupled with  a growing
      economy will continue to result in  increased demand for office space  and
      positive   net  absorption   in  the   Southern  California   region,  and
      particularly in the selected submarkets  where most of the Properties  are
      located. See "Southern California Economy and Office Markets."
 
    Richard  S. Ziman, the Chairman and  Chief Executive Officer of the Company,
has been involved in the  real estate business for over  25 years. In 1979,  Mr.
Ziman  co-founded, as managing general partner, Pacific Financial Group ("PFG"),
whose primary  focus was  to acquire  underperforming office  buildings in  good
locations  and  then  actively  manage, lease  and  renovate  the  properties to
increase cash flow and enhance their value. During the early and mid 1980's, PFG
acquired over  4.0  million  square  feet  of  commercial  office  space  almost
exclusively  in Los Angeles County and Orange  County. In order to capitalize on
the escalation of prices for Southern  California office properties in the  late
1980's,  PFG sold  substantially all of  its interests in  its office properties
portfolio prior to the  general downturn in the  real estate market in  Southern
California.
 
    In  1993,  in anticipation  of a  recovery in  the Southern  California real
estate market,  the  Company  began to  selectively  acquire  commercial  office
properties  located in suburban  Los Angeles County.  In assembling its existing
portfolio and as  part of its  operating strategy, the  Company acquired  office
properties   that  were  located  in  submarkets  with  growth  potential,  were
underperforming or needed  renovation and  which offered  opportunities for  the
Company  to  implement  its value-added  strategy  to increase  cash  flow. This
strategy includes active  management and aggressive  leasing efforts, a  focused
renovation  and refurbishment program for  underperforming assets, reduction and
containment of operating  costs and emphasis  on tenant satisfaction  (including
efforts  to  maximize  tenant  retention at  lease  expiration  and  programs to
relocate tenants to other spaces within the Company's portfolio). The  Company's
commitment  to tenant satisfaction  and retention is  evidenced by its retention
rate of approximately 79% (based on square feet renewed) from 1993 through  1995
and   management's  on-going  relationships  with  multi-site  tenants  such  as
McDonnell Douglas, Merrill  Lynch, Imperial Bank,  Smith Barney, GTE  California
and City National Bank.
 
    The  Company  believes  that  it has  been  successful  in  implementing its
value-added strategy and increasing  occupancy rates and  rental revenue. As  of
April 30, 1996, the Properties owned by the Company for more than one year had a
weighted  average occupancy  rate of approximately  87%, compared  to a weighted
average  occupancy  of  approximately  78%  as  of  the  respective  dates  such
Properties  were acquired by  the Company. In  addition, the Company's occupancy
rates at many  of its  Properties are above  market averages  in the  applicable
submarkets based on information included in a market study prepared by Cushman &
Wakefield  of California, Inc. ("C&W") for the Company (the "C&W Market Study").
As of April 30, 1996, the weighted  average occupancy rate of the 21  Properties
located  in  Los  Angeles County  was  approximately 89%,  compared  to weighted
average occupancy  rates, as  of December  31, 1995,  of approximately  81%  for
office properties throughout Los Angeles County and approximately 84% for office
properties  in the  Los Angeles County  submarkets in which  such Properties are
located (based in each case on the C&W Market Study).
 
                                       2
<PAGE>
    The Company  believes  that  the  submarkets in  which  the  Properties  are
located, as well as certain additional submarkets within the Southern California
region, present significant opportunities for the Company to continue to acquire
Class  A  suburban  office  properties  at  attractive  yields  and  for  prices
significantly below replacement costs. To date, the Company has acquired each of
its Properties  at a  cost which  the Company  believes is  significantly  below
replacement  cost  based on  estimates of  replacement costs  of Class  A office
buildings included in the C&W  Market Study. As part  of its growth strategy  to
pursue  such acquisitions, the Company has  acquired five properties during 1996
and will use approximately $35 million of the net proceeds from the Offering  to
acquire  two additional  Properties (the  "Acquisition Properties") concurrently
with the Offering. The Acquisition  Properties contain a total of  approximately
298,000 rentable square feet and are located in suburban Los Angeles County. The
Company  believes that these  acquisitions demonstrate its  ability, through its
local market  expertise,  to  identify and  complete  acquisitions  in  selected
submarkets  within Southern California at prices significantly below replacement
cost based  on  estimates of  replacement  costs  of Class  A  office  buildings
included  in  the C&W  Market Study.  See "Business  and Growth  Strategies." To
capitalize on future acquisition opportunities, the Company is finalizing a $200
million credit facility (the "Credit Facility") which the Company expects to use
for acquiring properties and for general corporate purposes.
 
    Upon completion of the Offering, the founders and executive officers of  the
Company  will beneficially own approximately 9.32%  of the Company, assuming the
exchange of all  of their  OP Units  for Common  Stock and  excluding shares  of
Common Stock subject to options granted under the Company's 1996 Stock Incentive
Plan (the "Stock Incentive Plan").
 
                                  RISK FACTORS
 
    An  investment in the  Common Stock involves  various risks, and prospective
investors should carefully consider the  matters discussed under "Risk  Factors"
prior to an investment in the Company. Such risks include, among others:
 
    - the  possibility that the consideration to be  paid by the Company for the
      Properties and  the  other  assets  contributed  to  the  Company  in  its
      formation  may  exceed  their  fair  market  value  due  to  the  lack  of
      third-party appraisals;
 
    - risks generally associated with borrowing, including the possibility  that
      the  Company may  not be able  to refinance  outstanding indebtedness upon
      maturity (including  the Mortgage  Financing (as  defined below)  and  the
      Credit   Facility  which  will  mature  in  seven  years  and  two  years,
      respectively) or  that such  indebtedness might  be refinanced  at  higher
      interest  rates or otherwise  on terms less favorable  to the Company than
      existing indebtedness, which could adversely affect the Company's  ability
      to  make expected distributions to stockholders and its ability to qualify
      as a REIT;
 
    - risks generally  associated  with  real  estate  investment  and  property
      management,  such as the  need to renew  leases or relet  space upon lease
      expirations and,  at  times, to  pay  renovation and  reletting  costs  in
      connection  therewith,  the effect  of  economic and  other  conditions on
      office property cash  flows and  values, the  ability of  tenants to  make
      lease  payments, the ability of a  property to generate revenue sufficient
      to meet  operating  expenses,  including  future  debt  service,  and  the
      illiquidity  of real estate investments, all of which may adversely affect
      the Company's ability to make expected distributions to stockholders;
 
    - concentration of all  of the  Properties in Southern  California, and  the
      dependence  of the  Properties on  the conditions  of the  economy and the
      office markets  of  Southern  California and,  particularly,  Los  Angeles
      County which increases the risk of the Company being adversely affected by
      a  downturn in  the Southern California  or Los Angeles  County economy or
      office markets;
 
    - conflicts of interests in  the transactions relating  to the formation  of
      the  Company  and the  acquisition and  refinancing  of the  Properties in
      connection with  such  formation,  including  conflicts  relating  to  the
      interests  of  certain  members  of management  in  such  transactions and
      conflicts which may arise as
 
                                       3
<PAGE>
      a result of Lehman Brothers Inc. serving as lead managing underwriter  for
      the  Offering and receiving  a significant portion of  the net proceeds of
      the Offering as  repayment of  debt currently  secured by  certain of  the
      Properties;
 
    - conflicts  of  interest involving  management of  the Company  and certain
      members of  the Board  of Directors  in business  decisions regarding  the
      Company,  including  conflicts  associated  with  any  prepayment  of debt
      secured by  the Properties  that may  arise due  to the  more adverse  tax
      consequences  of such prepayment  to certain members  of management and of
      the Board of Directors as holders of OP Units;
 
    - risks associated with  the acquisition  of new  properties generally,  and
      with the Company's recent acquisition of many of the Properties, including
      risks  of acquiring properties  over which the Company  has had no control
      and which may have characteristics or deficiencies unknown to the  Company
      affecting  the value  or revenue  potential thereof,  the risk  that newly
      acquired properties will  fail to  perform as  expected, risks  associated
      with  integrating such acquisitions into the Company's existing management
      structure and risks associated  with the lack  of operating history  under
      the Company's management of the most recently acquired Properties;
 
    - taxation  of the Company as a corporation if it fails to qualify as a REIT
      for federal income tax purposes, treatment of the Operating Partnership as
      an association  taxable as  a corporation  if  it fails  to qualify  as  a
      partnership  for federal income tax purposes (and the resulting failure of
      the Company to  qualify as a  REIT), the Company's  liability for  certain
      federal,  state and  local income  taxes in  such event  and the resulting
      decrease in cash available for distribution;
 
    - risks that certain types of losses, such as from earthquakes, could exceed
      the Company's insurance coverage;
 
    - absence of a limitation in the organizational documents of the Company  on
      the amount of indebtedness that the Company may incur;
 
    - dependence on certain key personnel;
 
    - anti-takeover  effect  of  limiting actual  or  constructive  ownership of
      capital stock of the Company by a single person to 9.0% of the outstanding
      capital stock, subject  to certain  specified exceptions,  and of  certain
      other  provisions contained in the organizational documents of the Company
      and the Operating Partnership,  which may discourage  a change in  control
      and  limit the opportunity for stockholders  to receive a premium over the
      then-current market price for their Common Stock;
 
    - existence of net losses of the Arden Predecessors, on a combined basis, of
      approximately $1.9 million for the three  months ended March 31, 1996  and
      approximately $1.2 million for the year ended December 31, 1995;
 
    - possible  environmental  liabilities  in  connection  with  the  Company's
      ownership and/or operation of the Properties;
 
    - effect of shares  available for  future sale on  the price  of the  Common
      Stock;
 
    - immediate  and substantial  dilution in  the net  tangible book  value per
      share of the shares of Common Stock purchased in the Offering; and
 
    - absence of a prior public market for the Common Stock.
 
                         BUSINESS AND GROWTH STRATEGIES
 
    The Company's primary  business objectives  are to maximize  growth in  cash
flow and to enhance the value of its portfolio in order to maximize total return
to  its stockholders.  The Company believes  it can achieve  these objectives by
continuing to implement its business  strategies and capitalize on the  external
and  internal growth opportunities  described below. The  Company also believes,
based on its  evaluation of  market conditions, that  a number  of factors  will
enhance its ability to achieve its business objectives,
 
                                       4
<PAGE>
including  (i) the  continuing improvement  in the  Southern California economy;
(ii)  the  limited  construction  of  new  office  properties  in  the  Southern
California  region due to the substantial  cost to develop new office properties
compared to  current acquisition  prices and  substantial building  construction
limitations  in  many  submarkets,  which  provides  opportunities  to  maximize
occupancy rates, rental rates and overall portfolio value; and (iii) the limited
availability of  conventional  real estate  financing  for new  construction  of
office properties in Southern California.
 
BUSINESS STRATEGIES
 
    The  Company's primary business  strategies are to  (i) acquire and renovate
underperforming office properties in submarkets  where it can utilize its  local
market  expertise and extensive real estate experience; (ii) actively manage its
portfolio; and  (iii) selectively  provide real  estate management  services  to
third  parties. When market conditions permit,  the Company may also develop new
properties in submarkets where it has local market expertise.
 
    The  Company  believes  that  (i)  the  Southern  California  region  offers
significant  growth  opportunities for  well-capitalized, experienced  owners of
real estate  with extensive  local  market expertise  and  (ii) being  a  public
company  will  enhance  its ability  to  obtain acquisition  financing,  to take
advantage of opportunities to acquire additional office properties at attractive
prices and to develop office  properties, when feasible, at attractive  returns.
Through  four regional offices,  the Company implements  its business strategies
by: (i) emphasizing  tenant satisfaction and  retention and employing  intensive
property  marketing  programs; (ii)  utilizing  a multidisciplinary  approach to
acquisition, management, leasing and renovation  activities that is designed  to
coordinate  decision-making and  enhance responsiveness  to market opportunities
and tenant needs;  and (iii)  implementing cost control  management and  systems
that  capitalize on economies of scale arising from the size and location of the
Company's portfolio.  The  Company believes  that  the implementation  of  these
operating  practices  has  increased the  occupancy  and rental  revenue  of its
existing portfolio.
 
GROWTH STRATEGIES
 
    EXTERNAL GROWTH:    The  Company  believes  that  significant  opportunities
continue  to exist  to acquire  additional office  properties that:  (i) provide
attractive initial yields with  significant potential for  growth in cash  flow;
(ii)  are in  desirable locations within  submarkets which  the Company believes
have  economic  growth  potential;  and   (iii)  are  underperforming  or   need
renovation,  and  which  therefore  provide  opportunities  for  the  Company to
increase the cash flow  and value of such  properties through active  management
and aggressive leasing.
 
    The  Company  intends  to  continue  to  acquire  office  properties  within
submarkets  in   Southern  California   which  the   Company  believes   present
opportunities  for long-term  stable and rising  rental rates  due to employment
growth,  population  movements  within  the  region  and  restrictions  on   new
development.  The Company generally targets properties which are underperforming
or need renovation  and offer  opportunities for  the Company  to implement  its
value-added  strategy to increase cash flow. For  example, as of April 30, 1996,
the Properties  owned by  the Company  for more  than one  year had  a  weighted
average occupancy rate of approximately 87%, compared to approximately 78% as of
the respective dates such Properties were acquired by the Company.
 
    In  addition, the Company  will seek to acquire  properties at a significant
discount to  replacement  cost in  the  relevant office  submarkets.  Since  the
beginning  of  1993, the  Company has  acquired its  Properties in  suburban Los
Angeles County  at a  cost which  the Company  believes is  significantly  below
replacement  cost  based on  estimates of  replacement costs  of Class  A office
buildings included in the C&W Market Study. See "Southern California Economy and
Office Markets."
 
    The Company believes it has certain competitive advantages which enhance its
ability to identify and capitalize on acquisition opportunities, including:  (i)
management's  significant local  market expertise,  experience and  knowledge of
properties, submarkets  and potential  tenants  within the  Southern  California
region;  (ii) management's long-standing relationships with tenants, real estate
brokers and institutional and other owners of commercial real estate; (iii)  its
fully  integrated  real estate  operations which  allow  the Company  to respond
quickly to  acquisition  opportunities and  enable  it to  provide  real  estate
management
 
                                       5
<PAGE>
services to third parties as a means of identifying such opportunities; (iv) its
access  to capital  as a  public company,  including the  Company's $200 million
Credit Facility; (v) its ability to acquire properties in exchange for OP  Units
or Common Stock if the sellers so desire; and (vi) management's reputation as an
experienced  purchaser of office properties in Southern California which has the
ability to effectively close transactions.
 
    The Company  may also  seek to  take advantage  of management's  development
expertise to develop office space when market conditions support office building
development.  The Company believes, however, that  opportunities exist for it to
continue to acquire  office properties  within selected  submarkets in  Southern
California  at less than  replacement cost and,  therefore, currently intends to
focus on acquisitions rather than development.
 
    INTERNAL GROWTH:  The Company believes that opportunities exist to  increase
cash  flow  from its  existing  portfolio and  that  such opportunities  will be
enhanced as  the Southern  California office  market continues  to improve.  The
Company  intends to  pursue internal  growth by  (i) continuing  to maintain and
improve occupancy rates through active  management and aggressive leasing;  (ii)
realizing  fixed contractual base rental increases  or increases tied to indices
such as the Consumer Price Index  (the "CPI"); (iii) re-leasing expiring  leases
at  increasing  market  rents which  are  expected  to result,  over  time, from
increased demand  for  office space  in  Southern California;  (iv)  controlling
operating  expenses through  the implementation  of cost  control management and
systems; (v) capitalizing  on economies of  scale arising from  the size of  its
portfolio;  and  (vi) increasing  revenue generated  from parking  facilities at
certain Properties where the  Company is currently offering  free parking as  an
amenity or charging below market rates.
 
                 SOUTHERN CALIFORNIA ECONOMY AND OFFICE MARKETS
 
OVERVIEW
 
    The  Company believes  that current  and forecast  trends affecting Southern
California have  created  and  will  continue to  create  a  favorable  economic
environment   in  the   suburban  Southern   California  office   markets  where
substantially all of the  Company's Properties are  located. First, the  Company
believes  that the  supply of  Class A office  space in  Southern California has
stabilized and is unlikely to increase over the short term in large part because
it is not economically  feasible to develop  new Class A  office space based  on
rental   rates  currently  attainable  in  Southern  California  office  markets
according to C&W. Second, the recent  economic restructuring and growth of  many
of   Southern   California's   primary   office-using   sectors   including  the
entertainment,   export/import,   managed   health   care,   high    technology,
telecommunications,  and civilian and military  aerospace and defense industries
has caused a growth in demand for office space. Third, demand for Class A office
space relative to the level  of supply has led to  higher occupancy rates and  a
trend  towards higher rental  rates which are supportable  in the office markets
where the Company's  Properties are  located. Finally,  patterns of  residential
relocation  to suburban areas  due in part  to the public  perception of greater
personal  security  and  to  the   availability  of  greater  recreational   and
residential  amenities in suburban  areas, coupled with  a heightened preference
for living  in close  proximity to  work and  employers' resultant  access to  a
broader,  more skilled local  labor force have fueled  growth of suburban office
property demand.  The Company  believes that  these factors  and other  specific
economic  indicators  discussed below  suggest  a general  strengthening  of the
Southern California economy. Given the  quality and location of its  Properties,
the  Company  believes it  is competitively  positioned  to capitalize  on these
economic trends and the resulting demand  for suburban Class A office space.  In
addition,  the Company believes that the  suburban Los Angeles County submarkets
in which its  Properties are  located will  outperform the  Los Angeles  central
business  district (the "Downtown/CBD"), which has not begun to recover from the
real estate downturn.
 
DECLINING UNEMPLOYMENT RATES AND INCREASING EMPLOYMENT.
 
    Data  from  the  U.S.  Bureau   of  Labor  Statistics  indicates  that   the
unemployment rates in Los Angeles, Orange and San Diego counties peaked in 1993,
the  height of the  1990 to 1993  recession in Southern  California, and that an
economic recovery began in 1994. The graph below illustrates unemployment trends
for the United States, California and the three counties in which the Properties
are located.
 
                                       6
<PAGE>
Line  graph  entitled  Historical  Year-End  Unemployment  Rates  depicting  the
following data points:
 
<TABLE>
<CAPTION>
                        LOS ANGELES    ORANGE      SAN DIEGO
           CALIFORNIA     COUNTY       COUNTY       COUNTY       U.S.
<S>        <C>          <C>          <C>          <C>          <C>
1991             7.7%         8.2%         5.2%         6.2%        6.7%
1992             9.3%         9.8%         6.6%         7.3%        7.4%
1993             9.4%         9.8%         6.7%         7.8%        6.8%
1994             8.6%         9.4%         5.8%         7.2%        6.1%
1995             7.8%         7.9%         5.3%         6.5%        5.6%
</TABLE>
 
                       [Insert Unemployment Rates Graph Here]
- --------------
Source: U.S. Bureau of Labor Statistics
 
    In  addition,  the U.S.  Bureau of  Economic Analysis  has forecast  a total
increase in nonfarm employment for the period from 1993 to 2005 of 14.2% for Los
Angeles County,  35.3%  for  Orange  County and  30.7%  for  San  Diego  County,
representing average annual growth rates of 1.1%, 2.5% and 2.3%, respectively.
 
IMPROVING OFFICE MARKETS
 
    The  Company believes that the office markets  in which it operates have and
will continue to improve in terms  of declining direct vacancy rates,  increased
net absorption, and stabilized or increasing rental rates.
 
    According  to C&W,  the Los  Angeles County  suburban office  market, Orange
County office market and downtown San Diego office market have improved in terms
of declining  vacancies and  increased  net absorption  from  1994 to  1995.  In
particular,  the Los Angeles  County suburban office  market (which excludes the
Downtown/CBD office  market sector)  has  experienced declining  direct  vacancy
rates  for the past  five years and  positive net absorption  for the past three
years.  Direct  vacancy  represents  space  available  from  owners  of   office
properties  and does  not include space  available for sub-lease  by tenants. As
outlined in the charts below, similar trends have been experienced in the Orange
County and downtown  San Diego  office markets. Line  graph entitled  Historical
Year-End Direct Vacancy Rates depicting the following data points:
 
<TABLE>
<CAPTION>
                      LOS ANGELES
                        COUNTY                       DOWNTOWN SAN
             U.S.     (SUBURBAN)    ORANGE COUNTY        DIEGO
<S>        <C>        <C>          <C>              <C>
1991           17.5%       19.2%          19.5%            19.4%
1992           18.2%       18.9%          19.1%            20.7%
1993           17.2%       18.4%          17.1%            19.4%
1994           15.3%       17.3%          17.2%            19.8%
1995           14.0%       17.0%          15.5%            17.9%
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
                                       7
<PAGE>
Bar graph entitled Historical Annual Net Absorption depicting the following data
points:
 
<TABLE>
<CAPTION>
                                    1993        1994       1995
<S>                              <C>         <C>         <C>
DOWNTOWN SAN DIEGO                  201,334     (45,192)   273,777
ORANGE COUNTY                     1,003,756     188,000    295,057
LOS ANGELES COUNTY                   55,268     234,566    983,906
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
    According  to C&W, virtually  no new office development  has occurred in Los
Angeles County, Orange County or downtown San Diego since 1992. In addition, C&W
states that  new  speculative  development  is unlikely  at  the  current  time,
primarily  because new construction  is not economically  feasible given current
market rental rates  and also  because of certain  governmental constraints  and
zoning  restrictions in certain markets. Because of the lack of new construction
of  office  properties  in  suburban   Los  Angeles  County  and  assuming   the
continuation  of the year-end 1995 positive  net absorption, C&W has projected a
trend indicating the reduction of aggregate direct vacancy rates in the suburban
Los Angeles County office market  from 17% as of December  31, 1995 to 14.4%  by
the end of 1998.
 
                                 THE PROPERTIES
 
    Upon  completion of the Offering, the  Company will own 24 office properties
containing approximately  4.0  million  rentable  square  feet.  The  Properties
consist  primarily of Class A suburban  office properties and individually range
from approximately 49,000 to 548,000 rentable square feet. The Company  believes
that  the  Properties  have  desirable  locations  within  established  business
communities  and  are  well-maintained.  Of  the  Company's  24  Properties,  20
Properties  have been  built since  1980 and  14 Properties,  including all four
built prior to  1980, have been  substantially renovated within  the last  three
years. The average age of the buildings is approximately 12 years.
 
    Management  believes that  the location and  quality of  construction of the
Properties, as well as  the Company's reputation for  providing a high level  of
tenant  service, have enabled the Company to attract and retain a diverse tenant
base. As of  April 30, 1996,  the Properties  were leased to  over 540  tenants.
Major  tenants in the Company's portfolio, based on square feet leased, include:
Merrill Lynch, Hewlett  Packard, Deloitte  & Touche,  GTE California,  McDonnell
Douglas,  Pepperdine  University,  Grey Advertising,  Earth  Technology  and The
Hearst Corporation. As of  April 30, 1996, no  single tenant accounted for  more
than  approximately 3.5% of  the aggregate Adjusted Annualized  Base Rent of the
Company's portfolio and only 16 tenants individually represented more than 1% of
such aggregate Adjusted Annualized Base Rent.
 
                                       8
<PAGE>
    The following  table  sets  forth  certain information  about  each  of  the
Properties as of April 30, 1996:
 
<TABLE>
<CAPTION>
                                                                                                                       AVERAGE
                                                                                       PERCENTAGE OF                  ADJUSTED
                                                                                           TOTAL                     ANNUALIZED
                                                                        APPROXIMATE      PORTFOLIO                    BASE RENT
                                                          YEAR BUILT/     RENTABLE       RENTABLE        PERCENT     PER LEASED
SUBMARKET/PROPERTY                      LOCATION           RENOVATED    SQUARE FEET     SQUARE FEET      LEASED      SQUARE FOOT
- --------------------------------------  ----------------  ------------  ------------  ---------------  -----------  -------------
<S>                                     <C>               <C>           <C>           <C>              <C>          <C>
LOS ANGELES COUNTY
- --------------------------------------
LOS ANGELES WEST
  BEVERLY HILLS/CENTURY CITY
    9665 Wilshire                       Beverly Hills     1972/92-3         158,345            3.9%          96.3%    $   31.00
    Beverly Atrium                      Beverly Hills     1989               61,314            1.5          100.0         22.70
    Century Park Center                 Los Angeles       1972/94           247,483            6.1           85.9         20.98
  WESTWOOD/WEST LOS ANGELES
    Westwood Terrace                    Los Angeles       1988              135,583            3.4           96.9         25.11
    1950 Sawtelle                       Los Angeles       1988/95           103,620            2.6           76.3         20.21
  MARINA AREA/CULVER CITY/LAX
    400 Corporate Pointe                Culver City       1987              164,845            4.1           91.5         19.72
    Bristol Plaza                       Culver City       1982               84,014            2.1           78.7         18.02
    Skyview Center                      Los Angeles       1981,87/95(1)     386,294            9.6           80.6         16.87
  PARK MILE/WEST HOLLYWOOD
    The New Wilshire                    Los Angeles       1986              202,544            5.0           84.1         20.48
LOS ANGELES NORTH
  SIMI/CONEJO VALLEY
    5601 Lindero Canyon                 Westlake          1989              105,830            2.6          100.0         11.15
    Calabasas Commerce Center           Calabasas         1990              123,121            3.0          100.0         17.14
  WEST SAN FERNANDO VALLEY
    Woodland Hills Financial Center     Woodland Hills    1972/95           221,790            5.5           86.7         21.81
  CENTRAL SAN FERNANDO VALLEY
    16000 Ventura Blvd.                 Encino            1980/96           178,341            4.4           85.8         19.63
  EAST SAN FERNANDO VALLEY/TRI-CITIES
    425 West Broadway                   Glendale          1984               71,489            1.8           89.9         19.45
    303 Glenoaks (2)                    Burbank           1983/96           175,449            4.3           95.7         20.38
    70 South Lake                       Pasadena          1982/94           100,133            2.5           76.6         20.83
LOS ANGELES SOUTH
  LONG BEACH
    4811 Airport Plaza Drive            Long Beach        1987/95           121,610            3.0          100.0          8.64
    4900/10 Airport Plaza Drive         Long Beach        1987/95           150,403            3.7          100.0          7.80
    5000 East Spring                    Long Beach        1989/95           163,358            4.0           87.0         19.93
    100 West Broadway                   Long Beach        1987/96           191,727            4.7           84.4         20.21
  CERRITOS/NORWALK
    12501 East Imperial Highway (2)     Norwalk           1978/94           122,175            3.0           91.9         15.85
ORANGE COUNTY
- --------------------------------------
  WEST COUNTY
    5832 Bolsa Avenue                   Huntington Beach  1985               49,355            1.2          100.0         12.96
  TRI-FREEWAY AREA
    Anaheim City Centre                 Anaheim           1986/91           175,391            4.3           85.5         15.24
SAN DIEGO COUNTY
- --------------------------------------
  SAN DIEGO MARKET
    Imperial Bank Tower                 San Diego         1982/96           547,578           13.5           82.0         17.95
                                                                        ------------         -----          -----        ------
    Total/Weighted Average                                                4,041,792          100.0%          88.0%    $   19.96(3)
</TABLE>
 
- ---------------
 
(1)  Skyview  Center consists  of two  Class  A 11-  and 12-story  office towers
    completed in 1981 and 1987, respectively, which were both renovated in 1995.
 
(2) Acquisition Property to be acquired concurrently with the Offering.
 
(3) Weighted average  Adjusted Annualized Base  Rent per leased  square foot  is
    calculated  based only  on rent which  is received from  tenants under gross
    leases, which  represent approximately  84% of  the total  portfolio  leased
    square feet. Excluded from the weighted average calculation are 5601 Lindero
    Canyon,  4811 Airport Plaza  Drive, 4900/10 Airport  Plaza Drive, 5832 Bolsa
    Avenue,  50%  of  space  at  400  Corporate  Pointe  leased  to   Pepperdine
    University,  and 48.3% of  space at Calabasas Commerce  Center leased to two
    tenants, all of which are triple net leased.
 
                                       9
<PAGE>
                     STRUCTURE AND FORMATION OF THE COMPANY
 
FORMATION TRANSACTIONS
 
    Concurrently with  the consummation  of the  Offering, the  Company and  the
Operating  Partnership,  together with  the partners  and  members of  the Arden
Predecessors and other parties which hold ownership interests in certain of  the
Properties  (collectively, the "Participants"), will engage in certain formation
transactions (the  "Formation Transactions").  The Formation  Transactions  have
been  designed  to (i)  enable the  Company  to raise  the necessary  capital to
acquire the Properties and  repay certain mortgage  debt relating thereto,  (ii)
provide  a vehicle for  future acquisitions, (iii) enable  the Company to comply
with certain  requirements under  the federal  income tax  laws and  regulations
relating to REITs, (iv) facilitate potential securitized mortgage financings and
(v)  preserve  certain  tax  advantages  for  certain  Arden  Predecessors.  The
Formation Transactions are as follows:
 
    - The Company will sell shares of Common Stock in the Offering.
 
    - Pursuant to  separate option  agreements  (the "Option  Agreements"),  the
      Company  will acquire  for cash  from certain  Participants (not including
      Messrs. Ziman  and Coleman  who will  not receive  cash in  the  Formation
      Transactions)  the interests owned by such  Participants in certain of the
      Arden Predecessors and in certain of the Properties. The Company will  pay
      approximately $28.6 million from the net proceeds of the Offering for such
      interests.
 
    - The  Company will contribute  (i) the interests  in the Arden Predecessors
      and in the Properties acquired pursuant to the Option Agreements and  (ii)
      the   net  proceeds  from   the  Offering  (after   payment  of  the  cash
      consideration to certain Participants as described above) to the Operating
      Partnership in  exchange for  a  87.37% general  partner interest  in  the
      Operating Partnership.
 
    - Pursuant   to   separate   contribution   agreements   (the  "Contribution
      Agreements"), the following additional contributions  will be made to  the
      Operating  Partnership  in  exchange  for  OP  Units  representing limited
      partner interests: (i) certain Participants will contribute the  remaining
      interests  in  the Arden  Predecessors and  in  certain of  the Properties
      (I.E., all interests not  acquired by the Company  pursuant to the  Option
      Agreements)  and  (ii)  Arden  will  contribute  certain  of  its  assets,
      including management contracts relating to  certain of the Properties  and
      the  contract rights to purchase  the Acquisition Properties (303 Glenoaks
      and  12501   East  Imperial   Highway).  The   Participants  making   such
      contributions  (including  Arden  and  Messrs.  Ziman  and  Coleman), will
      receive an aggregate  of 2,706,000 OP  Units, with an  estimated value  of
      approximately  $54.1 million based on  the assumed initial public offering
      price of the Common Stock.
 
    - The Company, through the Operating Partnership, will borrow  approximately
      $104  million aggregate principal amount under a seven-year term loan (the
      "Mortgage Financing")  which  will  be  secured  by  cross-collateralized,
      cross-defaulted  first  mortgage  lien(s)  on 10  of  the  Properties (the
      "Mortgage Financing Properties").
 
    - Approximately $35 million  of the  net proceeds  of the  Offering and  the
      Mortgage  Financing will be used by  the Operating Partnership to purchase
      the Acquisition Properties.
 
    - Approximately $392 million  of the net  proceeds of the  Offering and  the
      Mortgage  Financing will  be used  by the  Operating Partnership  to repay
      certain  mortgage  debt  secured   by  the  Properties  and   indebtedness
      outstanding  under  lines  of  credit  to  be  assumed  by  the  Operating
      Partnership in the Formation Transactions.
 
    - The Company, through the Operating  Partnership, will enter into the  $200
      million Credit Facility.
 
    Additional  information regarding  the Formation  Transactions is  set forth
under "Structure and Formation of the Company."
 
    Upon completion  of the  Formation Transactions,  the Operating  Partnership
will  hold substantially all of the assets of the Company, including 100% of the
interests in all of the Properties. Based on the assumed initial public offering
price of the Common Stock,  (i) the purchasers of  Common Stock in the  Offering
will
 
                                       10
<PAGE>
own  all of the outstanding Common Stock  (or 87.37% assuming exchange of all OP
Units for shares of  Common Stock), (ii)  the Company will  be the sole  general
partner of the Operating Partnership and will own 87.37% of the interests in the
Operating Partnership and (iii) Messrs. Ziman and Coleman will beneficially own,
directly  or indirectly through affiliates (including Arden), 1,966,283 OP Units
(representing an 9.17% limited partner  interest in the Operating  Partnership).
Pursuant  to the partnership agreement  governing the Operating Partnership (the
"Partnership Agreement"), the Participants receiving  OP Units in the  Formation
Transactions  will have certain rights, beginning one year after consummation of
the Offering, to cause  the Operating Partnership to  redeem their OP Units  for
cash  or, at the election of the Company,  to exchange their OP Units for shares
of Common  Stock  (on  a  one-for-one basis).  See  "Underwriting"  for  certain
transfer  restrictions  applicable to  the OP  Units held  by Messrs.  Ziman and
Coleman and to shares of Common Stock issued in exchange for such OP Units.
 
    The aggregate estimated value  of the cash  and OP Units to  be paid by  the
Company   and  the  Operating  Partnership  for   the  interests  in  the  Arden
Predecessors, the direct interests in certain  of the Properties and the  assets
of  Arden  is  approximately $82.7  million.  The  aggregate book  value  of the
interests and  assets  to  be  transferred to  the  Company  and  the  Operating
Partnership is approximately $15.8 million.
 
    No  independent  appraisals,  valuations  or  fairness  opinions  have  been
obtained in connection with the  Formation Transactions. Accordingly, there  can
be  no  assurance that  the  value of  the  OP Units  and  cash received  by the
Participants in  the Formation  Transactions is  equivalent to  the fair  market
value of the interests and assets acquired by the Company and contributed to the
Operating  Partnership. See "Risk Factors -- Price to be Paid for Properties and
Other Assets May Exceed Their Fair Market Value."
 
STRUCTURE OF THE COMPANY
 
    The Company will be the sole  general partner of the Operating  Partnership.
The Company will conduct substantially all of its business through the Operating
Partnership,  which will hold all of  the Company's interests in the Properties.
As the sole general partner of the Operating Partnership, the Company will  have
exclusive power to manage and conduct the business of the Operating Partnership,
subject  to  certain limited  exceptions. See  "Structure  and Formation  of the
Company -- The Operating Entities of the Company" and "Partnership Agreement  --
Management."
 
                                       11
<PAGE>
    The following diagram depicts the ownership structure of the Company and the
Operating  Partnership  upon  completion  of  the  Offering  and  the  Formation
Transactions:
 
                         STRUCTURE OF THE COMPANY UPON
           COMPLETION OF THE OFFERING AND THE FORMATION TRANSACTIONS
 
                                    [CHART]
 
BENEFITS TO RELATED PARTIES
 
    Certain affiliates of the Company will realize certain material benefits  in
connection with the Formation Transactions, including the following:
 
    - In  exchange  for  their  respective  ownership  interests  in  the  Arden
      Predecessors and  the assets  of  Arden, Messrs.  Ziman and  Coleman  will
      become  beneficial owners of a  total of 1,966,283 OP  Units, with a total
      value of approximately $39.3 million  based on the assumed initial  public
      offering price of the Common Stock, which compares to a book value of such
      interests  and assets of approximately $1.7  million as of March 31, 1996.
      The Company does  not believe that  the book values  of the interests  and
      assets  exchanged  are  equivalent  to  the  fair  market  values  of such
      interests and assets.
 
    - Approximately $392 million of indebtedness  secured by the Properties  and
      indebtedness  outstanding  under  lines of  credit  to be  assumed  by the
      Operating Partnership will be repaid in the Formation Transactions.
 
    - Pursuant to the  Partnership Agreement, certain  Participants who hold  OP
      Units,   including  Messrs.  Ziman  and   Coleman,  will  receive  special
      allocations of interest deduction of approximately $14.5 million  relating
      to the repayment of mortgage debt on certain of the Properties.
 
                                       12
<PAGE>
    - Messrs.  Ziman and  Coleman will  serve as  directors and  officers of the
      Company and  the  Operating Partnership  and  will enter  into  employment
      agreements  providing for  annual salaries, bonuses,  participation in the
      Company's Stock Incentive Plan and other benefits for their services.
 
    - So long as  he is  Chief Executive Officer,  Mr. Ziman  will have  certain
      participation  rights in connection with  future issuances of Common Stock
      by the Company or OP Units by the Operating Partnership which will  enable
      him to maintain his overall percentage ownership of the combined equity of
      the Company and the Operating Partnership.
 
    - Certain  Participants  including  Messrs.  Ziman  and  Coleman  will  have
      registration rights  with respect  to  shares of  Common Stock  issued  in
      exchange for OP Units.
 
    Additional  information  regarding these  and certain  other benefits  to be
received  by  affiliates  of  the  Company  in  connection  with  the  Formation
Transactions  is  set forth  under "Structure  and Formation  of the  Company --
Benefits of the  Formation Transactions and  the Offering to  Affiliates of  the
Company,"  and  "Management  --  Employment Agreements."  See  "Risk  Factors --
Conflicts of Interest in Formation Transactions and the Business of the  Company
- -- Benefits from the Formation Transactions" and "Certain Transactions."
 
DETERMINATION AND VALUATION OF OWNERSHIP INTERESTS
 
    The   Company's  percentage  interest  in   the  Operating  Partnership  was
determined  based  upon   the  percentage  of   estimated  Cash  Available   for
Distribution  (as defined herein)  required to pay  estimated cash distributions
resulting in an  annual distribution  rate equal to  8% of  the assumed  initial
public  offering  price  of the  Common  Stock.  The ownership  interest  in the
Operating Partnership allocated to  the Company is equal  to this percentage  of
estimated  Cash Available  for Distribution  and the  remaining interest  in the
Operating Partnership will be allocated  to the Participants receiving OP  Units
in  the Formation Transactions. The parameters  and assumptions used in deriving
the  estimated   Cash   Available   for   Distribution   are   described   under
"Distributions."
 
    The  Company did not obtain  appraisals with respect to  the market value of
any of the  Properties or  other assets that  the Company  will own  immediately
after  consummation of the Offering and the Formation Transactions or an opinion
as to  the  fairness of  the  allocation of  shares  to the  purchasers  in  the
Offering.  The valuation of the Company has been determined based primarily upon
the estimated Cash Available  for Distribution and  the factors discussed  under
"Underwriting," rather than a property-by-property valuation based on historical
cost  or current market value. This methodology has been used because management
believes it is appropriate  to value the Company  as an ongoing business  rather
than  with a  view to values  that could be  obtained from a  liquidation of the
Company or of individual properties owned by the Company.
 
RESTRICTIONS ON TRANSFER
 
    Under  the  Partnership  Agreement,   the  Participants  in  the   Formation
Transactions  are  prohibited from  transferring  their OP  Units,  except under
certain limited circumstances. Messrs. Ziman and Coleman have agreed not to sell
any shares of  Common Stock acquired  by them upon  exchange of OP  Units for  a
period  of two years after the completion of the Offering without the consent of
Lehman Brothers Inc. See "Partnership Agreement -- Transferability of Interests"
and "Underwriting."
 
RESTRICTIONS ON OWNERSHIP OF COMMON STOCK
 
    Due to limitations  on the  concentration of ownership  of stock  of a  REIT
imposed  by the  Internal Revenue  Code of  1986, as  amended (the  "Code"), the
charter of the Company (the  "Charter") prohibits any stockholder from  actually
or  constructively owning  more than  9.0% of  the outstanding  shares of Common
Stock (the "Ownership Limit"), except that Mr. Ziman and certain family  members
and  affiliates may actually and constructively own up to 13% of the outstanding
shares of Common Stock. See "Risk Factors  -- Limits on Changes in Control"  and
"Capital Stock -- Restrictions on Transfer."
 
                                       13
<PAGE>
                               FINANCING POLICIES
 
    As a general policy, the Company intends, but is not obligated, to limit its
debt  to total market capitalization ratio to no more than 50%. Since such ratio
is based upon market  values of equity,  it will fluctuate  with changes in  the
price  of  the  Common Stock;  however,  the  Company believes  that  this ratio
provides an appropriate indication  of leverage for a  company whose assets  are
primarily  real estate. The Company's debt  to total market capitalization ratio
at the  time  of  the  Offering  will  be  approximately  19.5%  (17.8%  if  the
Underwriters'  overallotment option  is exercised  in full).  See "Policies With
Respect To Certain Transactions -- Financing Policies."
 
                     MORTGAGE FINANCING AND CREDIT FACILITY
 
    MORTGAGE FINANCING.   The Company is  finalizing a seven-year  term loan  of
$104  million which will  close concurrently with the  Offering. The proceeds of
the Mortgage Financing, together with proceeds  from the Offering, will be  used
primarily  to  refinance  the  Company's  existing  mortgage  indebtedness.  The
Mortgage  Financing   will  be   non-recourse,   secured  primarily   by   fully
cross-collateralized and cross-defaulted first mortgage liens on the 10 Mortgage
Financing  Properties. The Mortgage  Financing will require  monthly payments of
interest only, with all principal due on the seventh anniversary of the  closing
of  the Mortgage Financing. The Mortgage  Financing is expected to bear interest
at a fixed rate of 7.95% per annum based on current interest rates.
 
    THE CREDIT FACILITY.   The Company  is finalizing a  two-year, $200  million
revolving Credit Facility with a one year extension. The Credit Facility will be
used,  among  other things,  to finance  acquisition of  properties, and  to the
extent required, for working capital purposes, which may include providing funds
for tenant improvements and capital expenditures.
 
    The Credit Facility will be  subject to customary conditions, including  the
payment of the commitment and maintenance fees, an initial minimum net operating
income,  an initial loan-to-value ratio not  exceeding 65% and the establishment
of a replacement reserve for capital expenditures, and will give the lender  the
right to approve the Properties securing the Credit Facility.
 
                                       14
<PAGE>
                                  THE OFFERING
 
    All  of the shares of  Common Stock being offered  in the Offering are being
offered by the Company.
 
Common Stock Offered by the Company...    18,725,000 shares
 
Common Stock Outstanding After the
  Offering (1)........................    18,725,000 shares
 
Use of Proceeds.......................    Payments to certain Participants (not
                                          including Messrs. Ziman and Coleman
                                          who will not receive cash in the
                                          Formation Transactions) for their
                                          interests in the Arden Predecessors
                                          and in certain of the Properties,
                                          repayment of mortgage debt on the
                                          Properties, including accrued and
                                          additional interest on such mortgage
                                          debt, purchase of the Acquisition
                                          Properties, tenant improvements and
                                          capital expenditure reserves, and for
                                          working capital purposes. See "Use of
                                          Proceeds," "Capitalization," and
                                          "Management's Discussion and Analysis
                                          of Financial Condition and Results of
                                          Operations -- Liquidity and Capital
                                          Resources."
 
New York Stock Exchange Symbol........    "ARI"
 
- --------------
 
(1) Assumes no OP  Units are exchanged  for Common Stock. If  all OP Units  were
    exchanged for Common Stock, there would be 21,431,000 shares of Common Stock
    outstanding after the Offering.
 
                                 DISTRIBUTIONS
 
    The   Company  intends  to  make  regular  quarterly  distributions  to  its
stockholders. The Company intends to pay a PRO RATA distribution with respect to
the period commencing on the closing of the Offering and ending on December  31,
1996,  based upon $0.40  per share for  a full quarter.  On an annualized basis,
this would be $1.60 per share (of which $0.258 may represent a return of capital
for tax purposes), or an  annual distribution rate of  8%, based on the  assumed
initial public offering price per share of $20. The Company intends initially to
distribute   annually  approximately  94.5%  of  estimated  Cash  Available  for
Distribution. The  Company  established this  distribution  rate based  upon  an
estimate  of  Cash  Available  for  Distribution  that  will  be  available  for
distributions after the Offering. See "Distributions" for information as to  how
this  estimate  was  derived.  The  Company  intends  to  maintain  its  initial
distribution rate  for the  twelve-month period  following consummation  of  the
Offering  unless  actual results  of  operations, economic  conditions  or other
factors  differ  materially   from  the  assumptions   used  in  its   estimate.
Distributions  by the Company will  be determined by the  Board of Directors and
will be  dependent upon  a number  of  factors. The  Company believes  that  its
estimate  of Cash Available for Distribution  constitutes a reasonable basis for
setting the initial distribution;  however, no assurance can  be given that  the
estimate  will  prove  accurate,  and  actual  distributions  may  therefore  be
significantly different from the expected  distributions. In addition, in  order
to  maintain its qualification as a REIT under the Code, the Company is required
to distribute  currently 95%  of its  taxable income.  See "Distributions."  The
Company  does not intend  to reduce the  expected distribution per  share if the
Underwriters' overallotment option is exercised.
 
                           TAX STATUS OF THE COMPANY
 
    The Company  intends to  elect to  be taxed  as a  REIT under  Sections  856
through  860 of the Code,  commencing with its taxable  year ending December 31,
1996, and believes its organization and proposed method of operation will enable
it to  meet the  requirements for  qualification  as a  REIT. To  maintain  REIT
 
                                       15
<PAGE>
status,  an  entity  must  meet  a  number  of  organizational  and  operational
requirements, including a requirement that it currently distribute at least  95%
of its taxable income to its stockholders. As a REIT, the Company generally will
not  be subject to federal income tax  on net income it distributes currently to
its stockholders. If the Company fails to qualify as a REIT in any taxable year,
it will  be  subject to  federal  income tax  at  regular corporate  rates.  See
"Federal Income Tax Considerations" and "Risk Factors -- Adverse Consequences of
Failure  to  Qualify as  a REIT;  Other  Tax Liabilities."  Even if  the Company
qualifies for taxation as a REIT, the Company may be subject to certain federal,
state and local taxes on its income and property.
 
                    SUMMARY SELECTED COMBINED FINANCIAL DATA
 
    The  following  sets  forth   selected  combined  financial  and   operating
information  on a pro forma  basis for the Company  and on a combined historical
basis for the Arden  Predecessors. The following information  should be read  in
conjunction  with the financial statements and  notes thereto of the Company and
of the Arden Predecessors  included elsewhere in  this Prospectus. The  selected
combined   historical  financial   and  operating   information  of   the  Arden
Predecessors at December 31, 1995 and 1994, and for the years ended December 31,
1995, 1994 and  1993, has been  derived from the  historical combined  financial
statements audited by Ernst & Young LLP, independent auditors, whose report with
respect  thereto is included elsewhere in this Prospectus. The selected combined
financial and operating information  for the three months  ended March 31,  1996
and  March  31, 1995  has  been derived  from  the unaudited  combined financial
statements of the Arden Predecessors included elsewhere in this Prospectus.
 
    The unaudited selected pro forma financial and operating information for the
three months  ended March  31, 1996  and the  year ended  December 31,  1995  is
presented as if the Offering, the Formation Transactions (including the purchase
of  the Acquisition Properties), and the acquisitions of the Properties acquired
during 1996  prior to  the Offering  (the "1996  Acquired Properties")  and  the
Properties  acquired  during  1995  (the  "1995  Acquired  Properties")  had all
occurred by March 31, 1996 for the  combined balance sheet and at the  beginning
of the period presented for the combined statements of operations. The pro forma
balance  sheet  information  also  gives effect  to  the  recording  of minority
interest for OP Units, as if these transactions occurred on March 31, 1996.  The
pro forma financial information is not necessarily indicative of what the actual
financial  position or results of the Company would  have been as of and for the
periods indicated,  nor  does  it  purport to  represent  the  Company's  future
financial position or results of operations.
 
                                       16
<PAGE>
                          THE COMPANY (PRO FORMA) AND
                    ARDEN PREDECESSORS (COMBINED HISTORICAL)
 
<TABLE>
<CAPTION>
                                             THREE MONTHS ENDED MARCH 31,
                                                                                            YEAR ENDED DECEMBER 31,
                                            ------------------------------  -------------------------------------------------------
                                                             COMBINED
                                            PRO FORMA       HISTORICAL      PRO FORMA               COMBINED HISTORICAL
                                            ---------   ------------------  ---------   -------------------------------------------
                                              1996        1996      1995      1995        1995       1994      1993    1992   1991
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
<S>                                         <C>         <C>       <C>       <C>         <C>        <C>       <C>       <C>    <C>
                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA, PERCENTAGES AND NUMBER OF PROPERTIES)
OPERATING DATA:
Revenue:
  Rental..................................   $16,562    $ 12,471  $  4,667   $66,691    $  24,442  $ 11,928  $  3,155  $--    $--
  Tenant reimbursements...................       859         758       128     3,019          822       509        38   --     --
  Parking.................................     1,596       1,267       268     5,895        1,665       741       284   --     --
  Other...................................       542         558       325     2,441        1,653       734       313    324     11
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
    Total revenue.........................    19,559      15,054     5,388    78,046       28,582    13,912     3,790    324     11
EXPENSES:
  Property operating, taxes, insurance and
   ground rent............................     5,462       4,579     1,532    24,546        8,679     3,810     1,163   --     --
  Property general and administrative.....       887         732       282     3,991        1,588       735       349   --     --
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
    Total property operating expenses.....     6,349       5,311     1,814    28,537       10,267     4,545     1,512   --     --
  General and administrative expenses.....       934         364       373     3,735        1,377       689       386    471      7
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
  Income before interest, depreciation and
   amortization...........................    12,276       9,379     3,201    45,774       16,938     8,679     1,892   (147)     4
  Depreciation and amortization...........     3,109       2,396       879    11,690        4,373     2,184       528      2   --
  Interest expense........................     2,114       8,832     2,241     8,419       13,780     5,109       673      9   --
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
Income (loss) before extraordinary loss...     7,053      (1,849)       81    25,665       (1,215)    1,385       691   (158)     4
Extraordinary loss........................     --          --        --        --          --           601     --      --
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
Income (loss) before minority interest....     7,053      (1,849)       81    25,665       (1,215)      784       691   (158)     4
Minority interest.........................       891       --        --        3,242       --         --        --      --     --
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
Net income (loss).........................   $ 6,162    $ (1,849) $     81   $22,423    $  (1,215) $    784  $    691  $(158) $   4
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
                                            ---------   --------  --------  ---------   ---------  --------  --------  -----  -----
Net income per common share...............   $   .33                         $  1.20
                                            ---------                       ---------
                                            ---------                       ---------
OTHER DATA:
Funds from Operations(1)..................   $10,162    $    547  $    960   $37,355    $   3,131  $  3,565  $  1,216  $(158) $   4
Cash flows from operating activities......     --          1,370       109     --           4,231     1,196     1,681   (258)     7
Cash flows from investing activities......     --        (95,854)  (20,086)    --        (150,022)  (45,804)  (62,907)  --     --
Cash flows from financing activities......     --         94,006    19,349     --         146,531    43,584    62,971    250      1
Number of Properties owned at period
  end.....................................        24          21         9        24           17         8         3   --     --
Gross rentable square feet of Properties
  owned at period end.....................     4,042       3,552     1,309     4,042        2,632     1,131       531   --     --
Occupancy at period end of Properties
  owned at period end.....................        88%         88%       83%       88%          88%       82%       84%  --     --
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                         DECEMBER 31,
                                                                                            ---------------------------------------
                                                                       MARCH 31, 1996
                                                                   ----------------------             COMBINED HISTORICAL
                                                                                COMBINED    ---------------------------------------
                                                                   PRO FORMA   HISTORICAL     1995      1994     1993    1992  1991
                                                                   ---------   ----------   --------  --------  -------  ----  ----
<S>                                                                <C>         <C>          <C>       <C>       <C>      <C>   <C>
                                                                                            (IN THOUSANDS)
BALANCE SHEET DATA:
Commercial office properties -- net of accumulated
  depreciation...................................................  $414,825     $345,633    $252,082  $106,135  $62,392  --    --
Total assets.....................................................   435,866      380,290     277,643   113,054   65,808  134    10
Mortgage loans payable and unsecured lines of credit.............   103,830      353,394     253,996    94,432   60,975  250   --
Total liabilities................................................   110,352      364,513     262,955    97,081   62,330  287     5
Minority interest................................................    41,103       --           --        --       --     --    --
Owners'/Stockholders' equity.....................................   284,411       15,777      14,688    15,973    3,478  (153)   5
</TABLE>
 
- ---------------
(1)  The White Paper on Funds from Operations approved by the Board of Governors
    of the National Association of  Real Estate Investment Trusts ("NAREIT")  in
    March  1995 (the "White Paper") defines  Funds from Operations as net income
    (loss) (computed in accordance with GAAP), excluding gains (or losses)  from
    debt   restructuring  and  sales  of  property,  plus  real  estate  related
    depreciation and  amortization  and  after  adjustments  for  unconsolidated
    partnerships  and joint ventures. Management considers Funds from Operations
    an appropriate  measure of  performance  of an  equity  REIT because  it  is
    predicated on cash flow analyses. The Company computes Funds from Operations
    in  accordance with  standards established  by the  White Paper.  Funds from
    Operations should  not  be  considered  as  an  alternative  to  net  income
    (determined  in  accordance  with GAAP)  as  an indicator  of  the Company's
    financial performance or to cash flow from operating activities  (determined
    in  accordance with GAAP) as a measure of the Company's liquidity, nor is it
    indicative of funds available  to fund the  Company's cash needs,  including
    its ability to make distributions.
 
                                       17
<PAGE>
                                  RISK FACTORS
 
    An  investment  in  the  Common Stock  involves  various  risks. Prospective
investors should  carefully consider  the following  information in  conjunction
with the other information contained in this Prospectus before making a decision
to purchase Common Stock in the Offering.
 
PRICE TO BE PAID FOR PROPERTIES AND OTHER ASSETS MAY EXCEED THEIR FAIR MARKET
VALUE
 
    No  independent valuations, appraisals or fairness opinions were obtained in
connection with  the  Formation  Transactions.  Accordingly,  there  can  be  no
assurance  that the prices paid  by the Company will  not exceed the fair market
value of the interests in the  Arden Predecessors, the Properties and the  other
assets  to  be  acquired  by  the Company  in  the  Formation  Transactions. The
valuation  of  the  Company   has  been  determined   based  primarily  upon   a
capitalization  of  estimated Cash  Available for  Distribution and  the factors
discussed under  "Structure  and  Formation  of the  Company  --  The  Formation
Transactions   --  Determination  and  Valuation  of  Ownership  Interests"  and
"Underwriting," rather than an asset-by-asset valuation based on historical cost
or current market value.  In valuing the Company  certain assumptions were  made
concerning  the  estimate of  revenue  to be  derived  from the  Properties. See
"Distributions."
 
    The Formation Transactions are not the result of arm's-length  negotiations.
The Participants (including Messrs. Ziman and Coleman, who are founders of Arden
and  the Arden Predecessors and  executive officers and members  of the Board of
Directors of the Company) have preexisting ownership interests in Arden and  the
Arden  Predecessors.  The  ownership  interests of  such  individuals  differ in
proportion and amount. Messrs.  Ziman and Coleman  have negotiated the  purchase
price for the assets to be acquired by the Company in the Formation Transactions
and  each of these  individuals will receive substantial  economic benefits as a
result of such  transactions. There  can be no  assurance that  the fair  market
value  of the Properties and the other assets to be acquired by the Company will
equal or exceed the sum of  the value of the OP  Units issued and the amount  of
cash paid to the Participants in the Formation Transactions.
 
REAL ESTATE FINANCING RISKS
 
    DEBT FINANCING AND EXISTING DEBT MATURITIES.  The Company will be subject to
risks  normally  associated with  debt financing,  including  the risk  that the
Company's cash flow will be insufficient to meet required payments of  principal
and  interest, the risk  that existing indebtedness on  the Properties (which in
all cases will not have been fully amortized at maturity) will not be able to be
refinanced or that the terms of such refinancing will not be as favorable as the
terms of  existing  indebtedness. Upon  consummation  of the  Offering  and  the
Formation  Transactions, the Company expects to have outstanding indebtedness of
approximately $104  million, which  will  mature in  seven years.  If  principal
payments due at maturity cannot be refinanced, extended or paid with proceeds of
other capital transactions, such as new equity capital, the Company expects that
its  cash  flow will  not be  sufficient in  all years  to pay  distributions at
expected levels and to repay all such maturing debt. Furthermore, if  prevailing
interest  rates  or  other factors  at  the  time of  refinancing  (such  as the
reluctance of lenders  to make commercial  real estate loans)  result in  higher
interest   rates  upon  refinancing,  the  interest  expense  relating  to  such
refinanced  indebtedness  would  increase,  which  could  adversely  affect  the
Company's  cash  flow and  its  ability to  make  expected distributions  to its
stockholders.
 
    POTENTIAL DEFAULTS  UNDER THE  MORTGAGE FINANCING.   Concurrently  with  the
Offering,   the  Company,   through  the  Operating   Partnership,  will  borrow
approximately $104 million in principal amount under the Mortgage Financing. The
payment and other obligations  under the Mortgage Financing  will be secured  by
cross-collateralized,  and  cross-defaulted  first mortgage  lien(s)  on  the 10
Mortgage Financing Properties. If the Company is unable to meet its  obligations
under  the Mortgage Financing,  the Mortgage Financing  Properties securing such
debt could be foreclosed on, which would  have a material adverse effect on  the
Company  and its ability  to make expected distributions  and could threaten the
continued viability  of  the Company.  See  "Policies With  Respect  to  Certain
Transactions -- Financing Policies."
 
    RISK  OF RISING INTEREST RATES AND VARIABLE RATE DEBT.  Upon consummation of
the Offering and the Formation Transactions, the Company expects to enter into a
$200 million  Credit  Facility. Advances  under  the Credit  Facility  may  bear
interest  at a variable rate. In addition,  the Company may incur other variable
 
                                       18
<PAGE>
rate  indebtedness  in  the  future.   Increases  in  interest  rates  on   such
indebtedness   would  increase  the  Company's  interest  expense,  which  could
adversely affect  the  Company's cash  flow  and  its ability  to  pay  expected
distributions to stockholders. Accordingly, the Company may in the future engage
in  other transactions to further limit its exposure to rising interest rates as
appropriate and cost  effective. See  "Management's Discussion  and Analysis  of
Financial   Condition  and  Results  of  Operations  --  Liquidity  and  Capital
Resources."
 
REAL ESTATE INVESTMENT RISKS
 
    GENERAL RISKS.  Real property investments are subject to varying degrees  of
risk.  The yields  available from  equity investments  in real  estate depend in
large part  on the  amount of  income generated  and expenses  incurred. If  the
Properties  do  not  generate  revenue sufficient  to  meet  operating expenses,
including debt  service,  tenant  improvements, leasing  commissions  and  other
capital expenditures, the Company may have to borrow additional amounts to cover
fixed costs and the Company's cash flow and ability to make distributions to its
stockholders will be adversely affected.
 
    The  Company's  revenue and  the value  of its  properties may  be adversely
affected by a number  of factors, including the  national economic climate;  the
local  economic  climate;  local  real  estate  conditions;  the  perceptions of
prospective tenants of the  attractiveness of the property;  the ability of  the
Company to manage and maintain the Properties and secure adequate insurance; and
increased  operating  costs  (including  real estate  taxes  and  utilities). In
addition, real estate  values and income  from properties are  also affected  by
such  factors as applicable  laws, including tax laws,  interest rate levels and
the availability of financing.
 
    RETENTION OF TENANTS AND  RELETTING SPACE.  The  Company will be subject  to
the  risks that upon expiration, leases may not be renewed, the space may not be
relet or  the terms  of renewal  or reletting  (including the  cost of  required
renovations)  may be less favorable than current  lease terms. Leases on a total
of approximately 15% and 53% of the occupied space in the Properties will expire
through the end  of 1997  and 2000,  respectively. The  Company has  established
initial  and annual reserves  for renovation and  reletting expenses, which take
into  consideration  its  views  of  both  the  current  and  expected  business
conditions  in the  suburban Los Angeles  County and  Southern California office
markets, but no assurance can be given that these reserves will be sufficient to
cover such costs. During 1996, the  re-leasing of the Company's expiring  leases
may  result in a net decrease in cash flow  from the leases due to the number of
leases expected to  expire during  such period  which are  above current  market
rents.  If the Company is unable to promptly  relet or renew leases for all or a
substantial portion of  this space,  if the rental  rates upon  such renewal  or
reletting are significantly lower than expected or if the Company's reserves for
these  purposes prove  inadequate, the Company's  cash flow and  ability to make
expected distributions to stockholders could be adversely affected.
 
    ILLIQUIDITY OF REAL ESTATE.   Equity real estate investments are  relatively
illiquid. Such illiquidity will tend to limit the ability of the Company to vary
its  portfolio promptly in response to  changes in economic or other conditions.
In addition, the Code limits a REIT's ability to sell properties held for  fewer
than  four  years, which  may affect  the Company's  ability to  sell properties
without adversely affecting returns to holders of Common Stock.
 
    COMPETITION.   Numerous office  properties compete  with the  Properties  in
attracting  tenants  to lease  space. Some  of the  competing properties  may be
newer, better located or owned by  parties better capitalized than the  Company.
The  number of competitive commercial properties in a particular area could have
a material adverse effect on  (i) the ability to  lease space in the  Properties
(or at newly acquired or developed properties) and (ii) the rents charged.
 
    CHANGES IN LAWS.  Because increases in income, service or transfer taxes are
generally  not  passed  through  to tenants  under  leases,  such  increases may
adversely affect the Company's cash flow  and its ability to make  distributions
to  stockholders. The Properties are also  subject to various federal, state and
local regulatory  requirements,  such  as requirements  of  the  Americans  with
Disabilities  Act  (the  "ADA")  and  state  and  local  fire  and  life  safety
requirements. Failure  to comply  with these  requirements could  result in  the
imposition  of fines by governmental authorities or awards of damages to private
litigants. The Company believes that the Properties are currently in substantial
compliance with all such regulatory requirements.
 
                                       19
<PAGE>
However, there can be no assurance  that these requirements will not be  changed
or  that new  requirements will not  be imposed which  would require significant
unanticipated expenditures by the  Company and could have  an adverse effect  on
the Company's cash flow and expected distributions.
 
    BANKRUPTCY AND FINANCIAL CONDITION OF TENANTS.  At any time, a tenant of the
Properties  may seek  the protection of  bankruptcy laws, which  could result in
rejection and termination of such tenant's  lease and thereby cause a  reduction
in cash flow available for distribution by the Company. Although the Company has
not  experienced material losses  from tenant bankruptcies,  no assurance can be
given that tenants will not file for bankruptcy protection in the future or,  if
any tenants file, that they will affirm their leases and continue to make rental
payments  in  a timely  manner.  In addition,  a tenant  from  time to  time may
experience a downturn in its business  which may weaken its financial  condition
and result in the failure to make rental payments when due. If tenant leases are
not  affirmed following bankruptcy or if a tenant's financial condition weakens,
the Company's income may be adversely affected.
 
    AMERICANS WITH  DISABILITIES ACT  COMPLIANCE.   Under  the ADA,  all  public
accommodations  and commercial facilities  are required to  meet certain federal
requirements related to access and  use by disabled persons. These  requirements
became  effective in  1992. Compliance with  the ADA  requirements could require
removal of  access barriers  and non-compliance  could result  in imposition  of
fines  by  the U.S.  government or  an  award of  damages to  private litigants.
Although  the  Company  believes  that  the  Properties  are  substantially   in
compliance  with these requirements,  the Company may  incur additional costs to
comply with the ADA. Although the Company believes that such costs will not have
a material adverse effect on the Company, if required changes involved a greater
expenditure than the  Company currently  anticipates, the  Company's ability  to
make expected distributions could be adversely affected.
 
    RISKS   INVOLVED  IN  PROPERTY  OWNERSHIP  THROUGH  PARTNERSHIPS  AND  JOINT
VENTURES.  The  Company will  own its interests  in the  Properties through  the
Operating  Partnership. In addition, the Company may also participate with other
entities in property  ownership through  joint ventures or  partnerships in  the
future.   Partnership   or  joint   venture   investments  may,   under  certain
circumstances, involve risks  not otherwise present,  including the  possibility
that  the Company's  partners or co-venturers  might become  bankrupt, that such
partners or  co-venturers might  at any  time have  economic or  other  business
interests  or goals which are inconsistent  with the business interests or goals
of the Company, and that such partners  or co-venturers may be in a position  to
take  action contrary to  the Company's instructions or  requests or contrary to
the Company's  policies  or  objectives, including  the  Company's  policy  with
respect  to maintaining its qualification as  a REIT. The Company will, however,
seek to maintain sufficient  control of such partnerships  or joint ventures  to
permit  the Company's business objectives to be achieved. There is no limitation
under the Company's organizational documents as to the amount of available funds
that may be invested in partnerships or joint ventures.
 
GEOGRAPHIC CONCENTRATION
 
    All of the Company's Properties are located in Southern California, with  21
of  the 24 Properties located in suburban Los Angeles County. Los Angeles County
just recently  began  to  recover  from an  economic  recession  which  affected
Southern  California generally  and Los Angeles  County in  particular since the
early 1990s.  The Company's  revenue and  the  value of  its Properties  may  be
affected by a number of factors, including the local economic climate (which may
be  adversely impacted  by business  layoffs or  downsizing, industry slowdowns,
changing demographics and other factors) and local real estate conditions  (such
as  oversupply of  or reduced demand  for office and  other competing commercial
properties). Therefore,  the  Company's  performance and  its  ability  to  make
distributions  to stockholders will  likely be dependent, to  a large extent, on
the economic conditions in this market area.
 
CONFLICTS OF INTERESTS IN THE FORMATION TRANSACTIONS AND THE BUSINESS OF THE
COMPANY
 
    BENEFITS FROM FORMATION  TRANSACTIONS.  Participants  receiving OP Units  in
the  Formation  Transactions  (including  Messrs.  Ziman  and  Coleman,  who are
executive officers and directors of the Company, and Mr. Arthur Gilbert, who  is
a  director nominee of  the Company, and  Ms. Michele Byer,  who is an executive
officer of  the  Company), will  realize  certain benefits  from  the  Formation
Transactions  that will not generally be received by other persons participating
in   the    formation    of   the    Company,    including   receipt    of    an
 
                                       20
<PAGE>
aggregate  of  approximately  2,706,000 OP  Units,  and options  to  purchase an
aggregate of 780,000 shares of Common  Stock under the Stock Incentive Plan.  In
addition,  Messrs. Ziman and Coleman will  enter into employment agreements with
the Company. See  "Structure and  Formation of the  Company --  Benefits of  the
Formation  Transactions  and  the Offering  to  Affiliates of  the  Company" and
"Management -- Employment  Agreements." Because these  persons were involved  in
structuring  the Formation Transactions,  they had the  ability to influence the
type and  level of  benefits they  received.  As such,  these persons  may  have
interests  that  conflict  with the  interests  of others  participating  in the
Formation Transactions and with the interests of persons acquiring Common  Stock
in  the Offering.  As a  result, the  type and  level of  benefits these persons
received may have been different if they had not participated in structuring the
Formation Transactions.
 
    REPAYMENT OF CERTAIN DEBT.  Lehman  Brothers Holdings Inc., an affiliate  of
Lehman  Brothers  Inc., the  lead managing  underwriter  for the  Offering, will
receive approximately $303 million  (67.7% of the net  proceeds of the  Offering
and  the Mortgage Financing)  as repayment of  indebtedness and related interest
expected  to   be   outstanding  upon   consummation   of  the   Offering.   See
"Underwriting."
 
    FAILURE  TO ENFORCE TERMS OF FORMATION  AGREEMENTS.  As partners and members
in the Arden Predecessors  (which have owned the  Properties), owners of  Arden,
and  recipients  of cash  and OP  Units in  the Formation  Transactions, certain
members of the Company management, including Messrs. Ziman, Coleman and  Gilbert
and Ms. Byer, will have a conflict of interest with respect to their obligations
as  directors  or  executive officers  of  the  Company in  enforcing  the terms
(including  customary  representations  and  warranties  as  to  ownership   and
operation)  of the agreements relating  to the transfer to  the Company of their
interests in the  Properties and the  Arden assets. The  failure to enforce  the
material  terms of those agreements, particularly the indemnification provisions
for breaches of representations and warranties, could result in a monetary  loss
to the Company, which loss could have a material adverse effect on the Company's
financial  condition  or  results  of  operations.  In  addition,  the aggregate
liability of  Messrs. Ziman  and Coleman  and Arden  under those  agreements  is
limited  to  approximately $39.3  million  (the initial  value  of the  OP Units
received by them  in the  Formation Transactions  based on  the assumed  initial
offering  price of  the Common  Stock offered  hereby), and  each such  party is
severally liable, up  to the  initial value  of the  OP Units  received by  such
party,  only  for  breaches  of  such  party's  respective  representations  and
warranties. The  Company therefore  will have  no right  of recovery  as to  any
damages  in excess of such aggregate or  individual amounts that may result from
breaches of such representations and warranties.
 
    TAX CONSEQUENCES UPON ANY PREPAYMENT OF MORTGAGE FINANCING.  Certain Limited
Partners, including Messrs. Ziman, Coleman and Gilbert and Ms. Byer, will  incur
adverse tax consequences upon the prepayment of the Mortgage Financing which are
different  from the  tax consequences  to the  Company and  persons who purchase
shares of Common Stock in the Offering. Consequently, such Limited Partners  may
have   different  objectives  regarding  the  appropriate  timing  of  any  such
prepayment. While  the  Company will  have  the exclusive  authority  under  the
Partnership  Agreement to determine  whether, when, and on  what terms to prepay
the Mortgage Financing,  any such  decision would  require the  approval of  the
Board  of Directors. Messrs. Ziman,  Coleman and Gilbert and  Ms. Byer will have
substantial influence  with respect  to any  such decision,  and such  influence
could  be exercised in a manner not consistent  with the interests of some, or a
majority, of  the  Company's stockholders  including  in a  manner  which  could
prevent prepayment of the Mortgage Financing.
 
    LIMITATION  UPON SALE  OR REFINANCING  OF CENTURY PARK  CENTER.   Due to the
potential adverse consequences to certain Limited Partners which may result from
a sale  or refinancing  of Century  Park Center,  for a  period of  seven  years
following  the Offering, any sale or refinancing of Century Park Center requires
the consent of a majority of the  Limited Partners, which may cause the  Company
to  be  unable to  sell  this Property  in circumstances  in  which it  would be
advantageous to do so.
 
    OTHER REAL  ESTATE  INTERESTS.   Messrs.  Ziman, Coleman  and  Gilbert  hold
certain  real estate interests which are not being contributed to the Company as
part of  the  Formation Transactions.  Except  for  one property  owned  by  Mr.
Gilbert, none of such real estate interests relate to properties that are office
 
                                       21
<PAGE>
properties. None of such real estate interests, including Mr. Gilbert's interest
in  such office property, are  appropriate for inclusion in  the REIT as they do
not satisfy the investment and acquisition policies of the Company.
 
RISKS ASSOCIATED WITH THE RECENT ACQUISITION OF MANY OF THE NEW PROPERTIES; LACK
OF OPERATING HISTORY
 
    After giving effect to the Formation  Transactions, the Company will own  24
Properties, consisting of approximately 4.0 million rentable square feet. All of
the Properties have been under the Company's management for 3 1/2 years or less.
The  most  recently  acquired  of the  Properties  may  have  characteristics or
deficiencies unknown  to  the  Company  affecting  their  valuation  or  revenue
potential,  and it is also  possible that the operating  performance of the most
recently acquired Properties may decline under the Company's management.
 
    The Company  is currently  experiencing a  period of  rapid growth.  As  the
Company  acquires additional  properties, the Company  will be  subject to risks
associated  with  managing  new   properties,  including  lease-up  and   tenant
retention.  In addition, the Company's ability  to manage its growth effectively
will require it to successfully integrate its new acquisitions into its existing
management structure. No assurances can be  given that the Company will be  able
to  succeed with such integration or effectively manage additional properties or
that newly acquired properties will perform as expected.
 
RISK OF ACQUISITION, RENOVATION AND DEVELOPMENT ACTIVITIES
 
    The Company intends to continue  acquiring office properties. See  "Business
and Growth Strategies -- Business Strategies." Acquisitions of office properties
entail   risks  that  investments  will  fail  to  perform  in  accordance  with
expectations. Estimates of renovation costs  and costs of improvements to  bring
an  acquired  property  up  to standards  established  for  the  market position
intended for that property may prove inaccurate. In addition, there are  general
investment risks associated with any new real estate investment.
 
    The  Company intends to  expand and/or renovate its  Properties from time to
time. Expansion and renovation projects generally require expenditure of capital
as well as various government and  other approvals, the receipt of which  cannot
be  assured. While policies with respect  to expansion and renovation activities
are intended  to  limit  some  of  the  risks  otherwise  associated  with  such
activities,  the  Company  will  nevertheless  incur  certain  risks,  including
expenditures of funds on, and devotion  of management's time to, projects  which
may not be completed.
 
    The  Company anticipates  that future  acquisitions and  renovations will be
financed through  a combination  of advances  under the  Credit Facility,  other
lines  of  credit and  other forms  of  secured or  unsecured financing.  If new
developments are financed through construction loans, there is a risk that, upon
completion of construction, permanent  financing for newly developed  properties
may not be available or may be available only on disadvantageous terms.
 
    While  the  Company  has  generally  limited  its  acquisition,  renovation,
management and leasing business primarily to the Southern California market,  it
is  possible that  the Company  will in  the future  expand its  business to new
geographic markets. The  Company will not  initially possess the  same level  of
familiarity  with  new  markets  outside  of  Southern  California,  which could
adversely affect its ability to acquire, develop, manage or lease properties  in
any new localities.
 
    Changing  market conditions, including competition  from other purchasers of
Class A suburban office properties, may diminish the Company's opportunities for
attractive additional acquisitions.
 
    The Company also  intends to  review from time  to time  the possibility  of
developing  and constructing office buildings and other commercial properties in
accordance  with  the  Company's  development  and  underwriting  policies.  See
"Business  and Growth Strategies --  Business Strategies." Risks associated with
the Company's development and  construction activities may include:  abandonment
of  development  opportunities;  construction  costs  of  a  property  exceeding
original estimates, possibly making  the property uneconomical; occupancy  rates
and  rents  at a  newly completed  property may  not be  sufficient to  make the
property profitable;  financing may  not  be available  on favorable  terms  for
development of a property; and
 
                                       22
<PAGE>
construction  and  lease-up  may  not be  completed  on  schedule,  resulting in
increased  debt  service  expense  and  construction  costs.  In  addition,  new
development   activities,  regardless  of  whether   they  would  ultimately  be
successful, typically require  a substantial  portion of  management's time  and
attention. Development activities would also be subject to risks relating to the
inability  to obtain,  or delays in  obtaining, all  necessary zoning, land-use,
building, occupancy, and other required governmental permits and authorizations.
 
ADVERSE CONSEQUENCES OF FAILURE TO QUALIFY AS A REIT; OTHER TAX LIABILITIES
 
    TAX LIABILITIES AS  A CONSEQUENCE  OF FAILURE  TO QUALIFY  AS A  REIT.   The
Company intends to operate so as to qualify as a REIT under the Code, commencing
with  its taxable  year ending December  31, 1996.  Although management believes
that it will be organized and will operate in such a manner, no assurance can be
given that the Company will be organized or will be able to operate in a  manner
so  as to qualify or  remain so qualified. Qualification  as a REIT involves the
satisfaction of numerous requirements  (some on an  annual and quarterly  basis)
established  under highly technical and complex  Code provisions for which there
are only limited  judicial and administrative  interpretations, and involve  the
determination  of various factual matters  and circumstances not entirely within
the Company's control. For example, in order to qualify as a REIT, at least  95%
of  the  Company's gross  income in  any  year must  be derived  from qualifying
sources and  the  Company must  pay  distributions to  stockholders  aggregating
annually  at least 95% of its REIT taxable income (excluding capital gains). The
complexity of these provisions and  of the applicable Treasury Regulations  that
have been promulgated under the Code is greater in the case of a REIT that holds
its  assets in partnership form. No assurance can be given that legislation, new
regulations,  administrative  interpretations  or   court  decisions  will   not
significantly change the tax laws with respect to qualification as a REIT or the
federal income tax consequences of such qualification. The Company is relying on
the  opinion  of Latham  & Watkins,  counsel to  the Company,  regarding various
issues affecting the Company's ability to qualify, and continue to qualify, as a
REIT. See "Federal Income Tax Considerations  -- Taxation of the Company."  Such
legal opinion is based on various assumptions and factual representations by the
Company  regarding the  Company's ability to  meet the  various requirements for
qualification as a  REIT, and no  assurance can be  given that actual  operating
results  will meet these requirements. Such legal  opinion is not binding on the
IRS or any court.
 
    If the Company were to  fail to qualify as a  REIT in any taxable year,  the
Company  would  be  subject  to federal  income  tax  (including  any applicable
alternative minimum  tax) on  its  taxable income  at regular  corporate  rates.
Moreover,  unless  entitled to  relief under  certain statutory  provisions, the
Company also would be disqualified from treatment as a REIT for the four taxable
years following the  year during  which qualification was  lost. This  treatment
would  significantly  reduce  the  net earnings  of  the  Company  available for
investment or  distribution  to  stockholders  because  of  the  additional  tax
liability  to the Company for the  years involved. In addition, distributions to
stockholders would no  longer be required  to be made.  See "Federal Income  Tax
Considerations -- Taxation of the Company -- Requirements for Qualification."
 
    OTHER  TAX LIABILITIES.  Even if the Company qualifies for and maintains its
REIT status, it will be subject to certain federal, state and local taxes on its
income  and  property.  If  the  Company  has  net  income  from  a   prohibited
transaction,  such income will be subject to a 100% tax. See "Federal Income Tax
Considerations."
 
FAILURE OF THE OPERATING PARTNERSHIP TO QUALIFY AS A PARTNERSHIP FOR FEDERAL
INCOME TAX PURPOSES
 
    The Company will receive an opinion of Latham & Watkins, tax counsel to  the
Company,  at the closing  of the Formation  Transactions to the  effect that the
Operating Partnership is properly  treated as a  partnership for federal  income
tax  purposes. Such opinion is not binding on  the IRS or the courts. If the IRS
were to successfully challenge the tax status of the Operating Partnership as  a
partnership  for federal income tax purposes, the Operating Partnership would be
treated as an association taxable as a corporation. In such event, the character
of the  Company's assets  and  income would  change,  which would  preclude  the
Company  from satisfying the REIT asset tests  and possibly the income tests (as
set forth in the Code) and, in  turn, would prevent the Company from  qualifying
as  a REIT. The imposition of a corporate tax on the Operating Partnership would
also reduce the amount  of funds available for  distribution to the Company  and
its  stockholders. See "Federal Income Tax  Considerations -- Tax Aspects of the
Operating Partnership."
 
                                       23
<PAGE>
INSURANCE
 
    The Operating Partnership  carries comprehensive  liability, fire,  extended
coverage  and rental loss insurance covering  all of the Properties, with policy
specifications and insured limits  which the Company  believes are adequate  and
appropriate  under  the circumstances.  The  Operating Partnership  also carries
earthquake insurance on all of the Properties. There are, however, certain types
of losses that are not generally insured because it is not economically feasible
to insure against such losses. Should an  uninsured loss or a loss in excess  of
insured  limits occur, the Operating Partnership could lose its capital invested
in the property,  as well as  the anticipated future  revenue from the  property
and,  in the case of  debt which is with  recourse to the Operating Partnership,
would remain  obligated for  any mortgage  debt or  other financial  obligations
related  to  the property.  Any such  loss would  adversely affect  the Company.
Moreover, as a general  partner of the Operating  Partnership, the Company  will
generally  be  liable for  any unsatisfied  obligations other  than non-recourse
obligations. The Company believes that the Properties are adequately insured. In
addition, in light of the California earthquake risk, California building  codes
since  the early  1970's have established  construction standards  for all newly
built and  renovated  buildings, including  office  buildings, the  current  and
strictest  construction  standards  having  been  adopted  in  1984.  Of  the 24
Properties, 13 have been  built since January 1,  1985 and the Company  believes
that  all  of  the  Properties  were constructed  in  full  compliance  with the
applicable standards existing  at the  time of  construction. While  earthquakes
have  occurred in Southern California, the only loss the Company has experienced
as a result of earthquakes was minor damage to three of its buildings due to the
Northridge earthquake, which resulted  in an extraordinary  loss of $601,000  in
the year ended December 31, 1994. No assurance can be given that material losses
in excess of insurance proceeds will not occur in the future.
 
NO LIMITATION ON DEBT
 
    Upon  completion  of  the  Offering  and  the  Formation  Transactions,  the
Company's debt to total market capitalization ratio will be approximately  19.5%
(17.8%  if the  Underwriters' overallotment  option is  exercised in  full). The
Company currently has a  policy of incurring debt  only if upon such  incurrence
the  debt to  total market capitalization  ratio would  be 50% or  less, but the
organizational documents of  the Company do  not contain any  limitation on  the
amount  of  indebtedness  the  Company  may  incur.  Accordingly,  the  Board of
Directors could alter or eliminate this policy. If this policy were changed, the
Company could become  more highly leveraged,  resulting in an  increase in  debt
service  that could adversely affect the  Company's cash flow and, consequently,
the amount available  for distribution  to stockholders and  could increase  the
risk of default on the Company's indebtedness.
 
    The  Company has  established its debt  policy relative to  the total market
capitalization of the  Company rather  than relative to  the book  value of  its
assets.  The Company  has used total  market capitalization  because it believes
that the book value of  its assets (which to a  large extent is the  depreciated
original  cost of real property, the Company's primary tangible assets) does not
accurately reflect its ability to borrow and to meet debt service  requirements.
The  market capitalization of  the Company, however, is  more variable than book
value, and does not necessarily reflect the fair market value of the  underlying
assets of the Company at all times. The Company will also consider factors other
than  market  capitalization in  making  decisions regarding  the  incurrence of
indebtedness, such as the purchase price of properties to be acquired with  debt
financing, the estimated market value of its properties upon refinancing and the
ability  of particular properties  and the Company  as a whole  to generate cash
flow to cover expected debt service.
 
DEPENDENCE ON KEY PERSONNEL
 
    The  Company  is  dependent  on  the  efforts  of  its  executive  officers,
particularly  Messrs. Ziman and Coleman. The loss of their services could have a
material adverse  effect  on  the  operations  of  the  Company.  Prior  to  the
consummation  of the Offering, each of Messrs. Ziman and Coleman will enter into
an  employment  agreement  with  the  Company.  See  "Management  --  Employment
Agreements."
 
LIMITS ON CHANGES IN CONTROL
 
    Certain  provisions of  Maryland law  and of the  Charter and  bylaws of the
Company (the "Bylaws") may have the effect of delaying, deferring or  preventing
a  third  party from  making an  acquisition  proposal for  the Company  and may
thereby inhibit a change in control of the Company. For example, such provisions
may
 
                                       24
<PAGE>
(i) deter tender offers for the Common Stock, which offers may be attractive  to
the  stockholders,  or (ii)  deter purchases  of large  blocks of  Common Stock,
thereby limiting the opportunity for stockholders to receive a premium for their
Common Stock  over  then-prevailing  market  prices.  See  "Capital  Stock"  and
"Certain Provisions of Maryland Law and the Company's Charter and Bylaws." These
provisions include the following:
 
    LIMITS  ON OWNERSHIP OF COMMON STOCK.   In order for the Company to maintain
its qualification as  a REIT,  not more  than 50%  in value  of the  outstanding
shares  of Common Stock of the Company may be owned, actually or constructively,
by five  or  fewer  individuals (as  defined  in  the Code  to  include  certain
entities)  during the last half of a taxable year (other than the first year for
which the election to be treated as a  REIT has been made). In addition, if  the
Company,  or an owner of 10% or  more of the Company, actually or constructively
owns 10% or more of a tenant of  the Company (or a tenant of any partnership  in
which  the  Company is  a partner),  the  rent received  by the  Company (either
directly or  through  any  such  partnership)  from  such  tenant  will  not  be
qualifying  income for purposes of the REIT  gross income tests of the Code. See
"Federal Income Tax  Considerations --  Taxation of  the Company."  In order  to
protect  the  Company  against  the  risk  of  losing  REIT  status  due  to the
concentration of ownership among its stockholders, the Ownership Limit  included
in the Charter limits actual or constructive ownership of the outstanding shares
of  Common Stock  by any  single stockholder to  9.0% of  the total  of the then
outstanding shares  of  Common Stock.  See  "Capital Stock  --  Restrictions  on
Transfer."  Although the Board of Directors  presently has no intention of doing
so (except  as  described  below),  the Board  of  Directors  could  waive  this
restriction with respect to a particular stockholder if it were satisfied, based
upon  the advice of tax counsel, that ownership by such stockholder in excess of
the Ownership Limit would not jeopardize the Company's status as a REIT and  the
Board  of Directors otherwise decided such action would be in the best interests
of the Company. Actual  or constructive ownership of  shares of Common Stock  in
excess  of the Ownership Limit will cause the violative transfer or ownership to
be void with respect to the transferee or  owner as to that number of shares  in
excess  of the Ownership Limit and such shares will be automatically transferred
to a  trust  for  the  benefit of  a  qualified  charitable  organization.  Such
transferee  or owner shall have  no right to vote such  shares or be entitled to
dividends or  other distributions  with respect  to such  shares. The  Board  of
Directors  has waived the Ownership Limit with  respect to Mr. Ziman and certain
family members  and  affiliates  and  permitted such  parties  to  actually  and
constructively  own up  to 13%  of the outstanding  shares of  Common Stock. See
"Capital Stock -- Restrictions on Transfer" for additional information regarding
the Ownership Limit.
 
    PREFERRED STOCK.  The Charter authorizes the Board of Directors to cause the
Company to issue  authorized but unissued  shares of Common  Stock or  Preferred
Stock  and to classify or reclassify any  unissued shares of Preferred Stock and
to  set  the  preferences,  rights  and  other  terms  of  such  classified   or
unclassified  shares. See "Capital Stock -- Preferred Stock." Although the Board
of Directors has no  such intention at  the present time,  it could establish  a
series  of Preferred Stock  that could, depending  on the terms  of such series,
delay, defer or prevent a transaction or a change in control of the Company that
might involve a premium price for the  Common Stock or otherwise be in the  best
interest of the stockholders.
 
    STAGGERED  BOARD.   The Company's Board  of Directors is  divided into three
classes of directors. The initial terms  of the first, second and third  classes
will  expire in 1997, 1998 and  1999, respectively. Beginning in 1997, directors
of each class will be chosen for  three-year terms upon the expiration of  their
current  terms  and each  year one  class of  directors will  be elected  by the
stockholders. The staggered terms of directors  may reduce the possibility of  a
tender offer or an attempt to change control of the Company even though a tender
offer  or change in control  might be in the  best interest of the stockholders.
See "Certain Provisions of Maryland Law and the Company's Charter and Bylaws  --
Board of Directors - Number, Classification, Vacancies."
 
    REQUIRED  CONSENT OF THE OPERATING PARTNERSHIP  FOR MERGER.  The Company may
not merge, consolidate or engage in any combination with another person or  sell
all  or substantially  all of  its assets  unless such  transaction includes the
merger of the Operating Partnership, which requires the approval of the  holders
of  a  majority  of  the  outstanding  OP  Units  representing  limited  partner
interests.  This  voting  requirement  might   limit  the  possibility  for   an
acquisition or change in control of the Company.
 
                                       25
<PAGE>
    MARYLAND   BUSINESS  COMBINATION  STATUTE.     Under  the  Maryland  General
Corporation Law, as amended ("MGCL"), certain "business combinations" (including
certain issuances of equity securities)  between a Maryland corporation and  any
person   who  beneficially  owns  10%  or  more  of  the  voting  power  of  the
corporation's shares (an "Interested Stockholder")  or an affiliate thereof  are
prohibited  for five years  after the most  recent date on  which the Interested
Stockholder becomes  an Interested  Stockholder. Thereafter,  any such  business
combination  must be  approved by  two super-majority  stockholder votes unless,
among other conditions, the corporation's common stockholders receive a  minimum
price  (as  defined in  the  MGCL) for  their  shares and  the  consideration is
received in  cash or  in the  same form  as previously  paid by  the  Interested
Stockholder  for  its common  shares.  The Charter  exempts  Mr. Ziman  from the
business  combination  provisions  of  the  MGCL.  The  applicability  of   such
prohibitions  and requirements to potential  business combinations involving the
Company could  have the  effect of  discouraging a  third party  from making  an
acquisition proposal for the Company and may thereby inhibit a change in control
of  the  Company. See  "Certain  Provisions of  Maryland  Law and  the Company's
Charter and Bylaws -- Business Combinations."
 
HISTORICAL LOSSES
 
    The Arden Predecessors had a  combined historical net loss of  approximately
$1.9  million for the three  months ended March 31,  1996 and approximately $1.2
million for  the year  ended December  31, 1995.  These net  losses reflect  the
substantial  interest expense associated  with the acquisition  financing of the
Properties and certain non-cash charges  such as depreciation and  amortization.
See  "Selected  Combined  Financial  Data"  and  the  financial  statements  and
accompanying notes included in this Prospectus. These historical results may not
be indicative of future results. Nonetheless, there can be no assurance that the
Company will not incur net losses in the future.
 
POSSIBLE ENVIRONMENTAL LIABILITIES
 
    Under various federal,  state and local  environmental laws, ordinances  and
regulations,  a current  or previous  owner or  operator of  real estate  may be
required to investigate and clean up hazardous or toxic substances or  petroleum
product  releases at  such property  and may  be held  liable to  a governmental
entity or  to  third parties  for  property  damage and  for  investigation  and
clean-up  costs incurred by  such parties in  connection with the contamination.
Such laws typically impose clean-up responsibility and liability without  regard
to whether the owner knew of or caused the presence of the contaminants, and the
liability  under such laws has  been interpreted to be  joint and several unless
the harm  is  divisible  and there  is  a  reasonable basis  for  allocation  of
responsibility.  The  costs of  investigation,  remediation or  removal  of such
substances may  be substantial,  and the  presence of  such substances,  or  the
failure  properly to remediate the contamination on such property, may adversely
affect the owner's ability to sell or rent such property or to borrow using such
property as collateral.  Persons who arrange  for the disposal  or treatment  of
hazardous  or toxic substances at  a disposal or treatment  facility also may be
liable for the  costs of removal  or remediation  of a release  of hazardous  or
toxic  substances at  such disposal or  treatment facility, whether  or not such
facility is owned or  operated by such person.  In addition, some  environmental
laws  create a  lien on  the contaminated  site in  favor of  the government for
damages and costs incurred  in connection with  the contamination. Finally,  the
owner  of a site may be  subject to common law claims  by third parties based on
damages and costs resulting from environmental contamination emanating from such
site.
 
    Certain federal, state and local laws, regulations and ordinances govern the
removal, encapsulation or disturbance  of asbestos-containing materials  ("ACM")
when  such materials  are in  poor condition  or in  the event  of construction,
remodeling, renovation  or  demolition  of  a building.  Such  laws  may  impose
liability  for release of ACM and may provide for third parties to seek recovery
from owners or operators of real properties for personal injury associated  with
ACM.  In  connection with  its ownership  and operation  of the  Properties, the
Company may be potentially liable for such costs. ACM has been detected  through
sampling  by environmental consultants at 70 South Lake, 16000 Ventura Boulevard
and 9665 Wilshire. The non-friable ACM was found in certain floor tiles and pipe
wrappings at 16000 Ventura Boulevard and 70 South Lake and in vinyl floor tiles,
carpet mastic,  drywall mud/tape,  textured  ceiling material,  core  insulation
 
                                       26
<PAGE>
material  and fireproofing at 9665 Wilshire.  The non-friable ACM found at these
Properties is not  expected to  present a  risk as long  as it  continues to  be
properly  managed.  The  environmental consultants  recommended  no  further ACM
sampling or removal action at any of the Properties.
 
    In the past two years, independent environmental consultants have  conducted
or  updated Phase  I Environmental  Assessments ("Phase  I Assessments")  at the
Properties. These  Phase I  Assessments  have included,  among other  things,  a
visual  inspection of the  Properties and the  surrounding area and  a review of
relevant state, federal and historical documents. No invasive techniques such as
soil or groundwater sampling were performed.
 
    The Company's Phase I  Assessments of the Properties  have not revealed  any
environmental  liability that the Company believes would have a material adverse
effect on the  Company's business, assets  or results of  operations taken as  a
whole,  nor is the  Company aware of any  such material environmental liability.
Nevertheless, it  is possible  that the  Company's Phase  I Assessments  do  not
reveal  all environmental liabilities  or that there  are material environmental
liabilities of which the Company is unaware. Moreover, there can be no assurance
that (i) future  laws, ordinances or  regulations will not  impose any  material
environmental  liability  or (ii)  the  current environmental  condition  of the
Properties will  not  be  affected by  tenants,  by  the condition  of  land  or
operations  in  the  vicinity  of  the  Properties  (such  as  the  presence  of
underground storage tanks), or by third parties unrelated to the Company.
 
    The Company believes that  the Properties are  in substantial compliance  in
all  material respects  with all federal,  state and local  laws, ordinances and
regulations regarding  hazardous  or  toxic substances  or  petroleum  products,
except  as noted above.  The Company has  not been notified  by any governmental
authority, and is not otherwise aware, of any material noncompliance,  liability
or  claim relating  to hazardous  or toxic  substances or  petroleum products in
connection with any of its present Properties, other than as noted above.
 
EFFECT ON COMMON STOCK PRICE OF SHARES AVAILABLE FOR FUTURE SALE
 
    Sales of a substantial number of  shares of Common Stock, or the  perception
that  such sales could occur, could adversely affect prevailing market prices of
the Common Stock. In connection with the formation of the Company, 2,706,000  OP
Units,  in addition to Common Stock sold by the Company in the Offering, will be
issued. See "Structure and Formation of the Company." Messrs. Ziman and  Coleman
have  agreed to certain restrictions on the dispositions of the shares of Common
Stock  issued  upon  exchange  of  OP  Units.  See  "Underwriting."  When   such
restrictions  lapse, Common Stock  issued upon the  exchange of OP  Units may be
sold in the public market pursuant  to registration rights that the Company  has
granted  to  the  Participants  or available  exemptions  from  registration. In
addition, 1,500,000  shares  of  Common  Stock will  be  reserved  for  issuance
pursuant  to  the  Company's Stock  Incentive  Plan,  and these  shares  will be
available for  sale  in  the  public  markets from  time  to  time  pursuant  to
exemptions  from  registration  requirements or  upon  registration.  Options to
purchase a total of 780,000  shares of Common Stock  will be granted to  certain
executive  officers, employees and  directors upon the  closing of the Offering.
See "Management -- Compensation of  Directors," "-- Executive Compensation"  and
"--  Stock Incentive  Plan." No  prediction can  be made  about the  effect that
future sales of Common Stock will have on the market prices of shares.
 
IMMEDIATE AND SUBSTANTIAL DILUTION
 
    As set forth more  fully under "Dilution," the  pro forma net tangible  book
value  per  share  of the  assets  of the  Company  after the  Offering  will be
substantially less  than the  initial public  offering price  per share  in  the
Offering.  Accordingly,  purchasers  of  the Common  Stock  offered  hereby will
experience immediate and  substantial dilution  of $4.81  per share  in the  net
tangible  book value of the Common Stock from the initial public offering price.
See "Dilution."
 
ABSENCE OF PRIOR PUBLIC MARKET FOR COMMON STOCK
 
    Prior to the Offering, there has been no public market for the Common  Stock
and  there can be no assurance that an  active trading market will develop or be
sustained or that shares of Common Stock will be resold at or above the  initial
public offering price. The initial public offering price of the Common Stock has
been  determined by agreement among the Company and the Underwriters and may not
be indicative of the
 
                                       27
<PAGE>
market price for the  Common Stock after the  Offering. See "Underwriting."  The
market  value of  the Common  Stock could  be substantially  affected by general
market conditions, including changes in interest rates. Moreover, numerous other
factors, such as governmental regulatory action  and changes in tax laws,  could
have a significant impact on the future market price of the Common Stock.
 
CHANGES IN POLICIES WITHOUT STOCKHOLDER APPROVAL
 
    The  investment,  financing,  borrowing  and  distribution  policies  of the
Company and its policies with respect to all other activities, including growth,
debt, capitalization  and  operations,  will  be  determined  by  the  Board  of
Directors.  Although the Board of  Directors has no present  intention to do so,
these policies may be amended  or revised at any time  and from time to time  at
the  discretion of the Board of Directors  without a vote of the stockholders of
the Company. A  change in these  policies could adversely  affect the  Company's
financial  condition, results  of operations or  the market price  of the Common
Stock. See "Policies with Respect to Certain Transactions."
 
INFLUENCE OF EXECUTIVE OFFICERS, DIRECTORS AND PRINCIPAL STOCKHOLDERS
 
    Upon completion of the Offering, all directors and executive officers of the
Company as  a group  will beneficially  own approximately  94% of  the OP  Units
which,  commencing  one  year  after  consummation  of  the  Offering,  will  be
redeemable by the holder for cash or, at the option of the Company, exchangeable
for shares of Common Stock on a one-for-one basis. Assuming the exchange of  all
of  these  OP Units  for shares  of  Common Stock,  all directors  and executive
officers as a  group would beneficially  own approximately 11.83%  of the  total
issued  and outstanding shares. Mr. Ziman currently serves as Chairman and Chief
Executive Officer and will be, along  with Mr. Coleman, who currently serves  as
President  and Chief Operating Officer, and  Mr. Gilbert (a director nominee) on
the initial Board of  Directors of the Company.  Accordingly, such persons  will
have  substantial  influence  on  the  Company,  which  influence  might  not be
consistent with the interests of other stockholders, and may in the future  have
a substantial influence on the outcome of any matters submitted to the Company's
stockholders  for approval  if all  of their OP  Units are  exchanged for Common
Stock. In addition,  although there  is no current  agreement, understanding  or
arrangement  for those Participants who received OP Units to act together on any
matter, the  Participants  could  be  in  a  position  to  exercise  significant
influence  over the affairs of  the Company if they were  to act together in the
future. See "Principal Stockholders."
 
RISKS OF FEE MANAGEMENT BUSINESS
 
    The  Company,  through   the  Operating  Partnership,   intends  to   pursue
selectively   the  management  of  properties  owned  by  third  parties.  Risks
associated with the management and leasing of properties owned by third  parties
include  the risk that the management and leasing contracts (which are typically
cancelable upon 15 to 60 days' notice or upon certain events, including sale  of
the  property)  will be  terminated by  the property  owner or  will be  lost in
connection with a sale of such property, that contracts may not be renewed  upon
expiration or may not be renewed on terms consistent with current terms and that
the  rental  revenues upon  which  management and  leasing  fees are  based will
decline as a result of general real estate market conditions or specific  market
factors  affecting properties  managed or  leased by  the Operating Partnership,
resulting in decreased management or leasing fee income.
 
EFFECT OF MARKET INTEREST RATES ON PRICE OF COMMON STOCK
 
    One of the factors that will influence the market price of the Common  Stock
in public markets will be the annual distribution rate on the shares. Increasing
market  interest rates  may lead prospective  purchasers of the  Common Stock to
demand a  higher annual  distribution rate  from future  distributions. Such  an
increase in the required distribution rate may adversely affect the market price
of the Common Stock.
 
                                       28
<PAGE>
                                  THE COMPANY
 
    The  Company has been formed to continue and expand the real estate business
of Arden  and  the  other  Arden  Predecessors  which  are  engaged  in  owning,
acquiring,  managing,  leasing  and  renovating  office  properties  in Southern
California. The  Company's founders,  Richard S.  Ziman and  Victor J.  Coleman,
along  with the other  five senior officers  at the Company,  have an average of
more than  18  years  of  experience in  the  Southern  California  real  estate
industry.  Upon  completion of  the  Offering, the  Company  will own  24 office
properties (the  "Properties")  containing approximately  4.0  million  rentable
square  feet. All of the Properties are  located in Southern California, with 21
in suburban  Los Angeles  County, two  in Orange  County and  one in  San  Diego
County.  As of April 30,  1996, the Properties had  a weighted average occupancy
rate of approximately 88%.  Arden currently manages 22  of the Properties.  Upon
completion  of the Offering, the  Company will manage all  of the Properties and
four additional properties containing approximately 325,000 rentable square feet
which are  currently managed  by  Arden for  institutional investors  and  other
third-party  owners. The Company  will be a  fully integrated, self-administered
and self-managed  real estate  company and  expects  to qualify  as a  REIT  for
federal income tax purposes.
 
    The  Company  believes that  all  of the  Properties  are located  in strong
submarkets which  generally  have  significant  rent  growth  potential  due  to
employment  growth, declining  vacancy rates, limited  new construction activity
and existing rental rates at levels  significantly below those required to  make
new  construction economically  feasible. The  Company's portfolio  is comprised
primarily of Class A suburban office properties. The Company generally considers
Class A suburban office  properties to be those  which have desirable  locations
and  high quality finishes,  are well maintained  and professionally managed and
are capable of achieving  rental and occupancy rates  which are typically  above
those prevailing in their respective markets. Of the Company's 24 Properties, 20
Properties  have been  built since  1980 and  14 Properties,  including all four
built prior to  1980, have been  substantially renovated within  the last  three
years.  The Properties  are leased to  over 540  tenants which engage  in a wide
variety of businesses, including financial services, entertainment, health  care
services,  accounting, law, computer technology, education and publishing. Major
tenants in  the  Company's portfolio,  based  on square  feet  leased,  include:
Merrill  Lynch, Hewlett  Packard, Deloitte  & Touche,  GTE California, McDonnell
Douglas, Pepperdine  University,  Grey  Advertising, Earth  Technology  and  The
Hearst  Corporation. As of April  30, 1996, no single  tenant accounted for more
than approximately 3.5% of  the aggregate Adjusted Annualized  Base Rent of  the
Company's portfolio and only 16 tenants individually represented more than 1% of
such aggregate Adjusted Annualized Base Rent.
 
    The   Company  believes  that  certain  economic  fundamentals  in  Southern
California provide an attractive environment for owning, acquiring and operating
Class A suburban office properties:
 
    - According to AMERICA'S  OFFICE ECONOMY  prepared by  Cognetics, Inc.,  Los
      Angeles County, in which 21 of the Company's 24 Properties are located, is
      the  number one market in the  United States for primary office employment
      growth;
 
    - According to statistics released by  the U.S. Bureau of Labor  Statistics,
      the  unemployment rate  in the  Los Angeles  PMSA, in  which 21  of the 24
      Properties are located,  has decreased  significantly over  the past  four
      years, falling from an average of 9.8% during 1992 to 7.9% during 1995;
 
    - The  Los Angeles EDC has forecast  nonfarm employment growth rates of 2.1%
      in 1996 and 1997 in Los Angeles County;
 
    - The Los Angeles EDC has also forecast that economic activity will increase
      twice as fast in Los Angeles County  than in the nation as a whole  during
      1996  and 1997, with inflation-adjusted gross product growing at a rate of
      5.2% and 5% in  Los Angeles County  as compared to 2.5%  and 2.4% for  the
      nation as a whole; and
 
    - Since  1992,  there  has  been very  limited  construction  of  new office
      properties in the  Southern California region.  The Company believes  that
      this  limited  construction of  office properties  coupled with  a growing
      economy will continue to result in  increased demand for office space  and
      positive   net  absorption   in  the   Southern  California   region,  and
      particularly in the selected submarkets  where most of the Properties  are
      located. See "Southern California Economy and Office Markets."
 
                                       29
<PAGE>
    Richard  S. Ziman, the Chairman and  Chief Executive Officer of the Company,
has been involved in the  real estate business for over  25 years. In 1979,  Mr.
Ziman  co-founded, as managing general partner,  PFG, whose primary focus was to
acquire underperforming office  buildings in  good locations  and then  actively
manage,  lease and  renovate the  properties to  increase cash  flow and enhance
their value. During  the early  and mid 1980's,  PFG acquired  over 4.0  million
square  feet of commercial office space almost exclusively in Los Angeles County
and Orange  County. In  order to  capitalize  on the  escalation of  prices  for
Southern California office properties in the late 1980's, PFG sold substantially
all  of its interests  in its office  properties portfolio prior  to the general
downturn in the real estate market in Southern California.
 
    In 1993,  in anticipation  of a  recovery in  the Southern  California  real
estate  market,  the  Company  began to  selectively  acquire  commercial office
properties located in suburban  Los Angeles County.  In assembling its  existing
portfolio  and as  part of its  operating strategy, the  Company acquired office
properties  that  were  located  in  submarkets  with  growth  potential,   were
underperforming  or needed  renovation and  which offered  opportunities for the
Company to  implement  its value-added  strategy  to increase  cash  flow.  This
strategy  includes active management  and aggressive leasing  efforts, a focused
renovation and refurbishment program  for underperforming assets, reduction  and
containment  of operating costs  and emphasis on  tenant satisfaction (including
efforts to  maximize  tenant  retention  at lease  expiration  and  programs  to
relocate  tenants to other spaces within the Company's portfolio). The Company's
commitment to tenant satisfaction  and retention is  evidenced by its  retention
rate  of approximately 79% (based on square feet renewed) from 1993 through 1995
and  management's  on-going  relationships  with  multi-site  tenants  such   as
McDonnell  Douglas, Merrill Lynch,  Imperial Bank, Smith  Barney, GTE California
and City National Bank.
 
    The Company  believes  that  it  has been  successful  in  implementing  its
value-added  strategy and increasing  occupancy rates and  rental revenue. As of
April 30, 1996, the Properties owned by the Company for more than one year had a
weighted average occupancy  rate of  approximately 87%, compared  to a  weighted
average  occupancy  of  approximately  78%  as  of  the  respective  dates  such
Properties were acquired by  the Company. In  addition, the Company's  occupancy
rates  at many  of its  Properties are above  market averages  in the applicable
submarkets based on information  included in the C&W  Market Study. As of  April
30,  1996, the weighted average  occupancy rate of the  21 Properties located in
Los Angeles County was approximately 89%, compared to weighted average occupancy
rates, as  of December  31, 1995,  of approximately  81% for  office  properties
throughout Los Angeles County and approximately 84% for office properties in the
Los  Angeles County  submarkets in which  such Properties are  located (based in
each case on the C&W Market Study).
 
    The Company  believes  that  the  submarkets in  which  the  Properties  are
located, as well as certain additional submarkets within the Southern California
region, present significant opportunities for the Company to continue to acquire
Class  A  suburban  office  properties  at  attractive  yields  and  for  prices
significantly below replacement  costs. To  date, the Company  has acquired  its
Properties  at  a  cost  which  the  Company  believes  is  significantly  below
replacement cost  based on  estimates of  replacement costs  of Class  A  office
buildings  included in the C&W  Market Study. As part  of its growth strategy to
pursue such acquisitions, the Company has  acquired five properties in 1996  and
will  use approximately  $35 million  of the net  proceeds from  the Offering to
acquire the  two  Acquisition Properties  concurrently  with the  Offering.  The
Acquisition  Properties contain a total of approximately 298,000 rentable square
feet and are located in suburban  Los Angeles County. The Company believes  that
these  acquisitions demonstrate its ability, through its local market expertise,
to identify and  complete acquisitions  in selected  submarkets within  Southern
California  at prices significantly below replacement cost based on estimates of
replacement costs of Class A office buildings included in the C&W Market  Study.
See  "Business  and  Growth  Strategies." To  capitalize  on  future acquisition
opportunities, the Company is  finalizing a $200  million Credit Facility  which
the  Company expects to  use for acquiring properties  and for general corporate
purposes.
 
    Upon completion of the Offering, the founders and executive officers of  the
Company  will beneficially own approximately 9.32%  of the Company, assuming the
exchange of all  of their  OP Units  for Common  Stock and  excluding shares  of
Common  Stock subject  to options  granted under  the Company's  Stock Incentive
Plan.
 
                                       30
<PAGE>
    The Company  is a  Maryland corporation  incorporated on  May 1,  1996.  The
Company's  executive offices are located at 9100 Wilshire Boulevard, East Tower,
Suite 700, Beverly  Hills, California 90212  and its telephone  number is  (310)
271-8600.
 
                         BUSINESS AND GROWTH STRATEGIES
 
    The  Company's primary  business objectives are  to maximize  growth in cash
flow and to enhance the value of its portfolio in order to maximize total return
to its stockholders.  The Company believes  it can achieve  these objectives  by
continuing  to implement its business strategies  and capitalize on the external
and internal growth  opportunities described below.  The Company also  believes,
based  on its  evaluation of  market conditions, that  a number  of factors will
enhance its  ability  to achieve  its  business objectives,  including  (i)  the
continuing  improvement  in the  Southern California  economy; (ii)  the limited
construction of new office properties in  the Southern California region due  to
the  substantial  cost  to develop  new  office properties  compared  to current
acquisition prices  and substantial  building construction  limitations in  many
submarkets,  which provides  opportunities to  maximize occupancy  rates, rental
rates and  overall  portfolio  value;  and (iii)  the  limited  availability  of
conventional  real estate financing for new construction of office properties in
Southern California.
 
BUSINESS STRATEGIES
 
    The Company's primary business  strategies are to  (i) acquire and  renovate
underperforming  office properties in submarkets where  it can utilize its local
market expertise and extensive real estate experience; (ii) actively manage  its
portfolio;  and  (iii) selectively  provide real  estate management  services to
third parties. When market conditions permit,  the Company may also develop  new
properties in submarkets where it has local market expertise.
 
    The  Company  believes  that  (i)  the  Southern  California  region  offers
significant growth  opportunities for  well-capitalized, experienced  owners  of
real  estate  with extensive  local  market expertise  and  (ii) being  a public
company will enhance its ability to  take advantage of opportunities to  acquire
additional office properties at attractive prices and develop office properties,
when feasible, at attractive returns. Through four regional offices, the Company
implements  its business strategies by:  (i) emphasizing tenant satisfaction and
retention and employing intensive property marketing programs; (ii) utilizing  a
multidisciplinary  approach to  acquisition, management,  leasing and renovation
activities  that  is   designed  to  coordinate   decision-making  and   enhance
responsiveness  to market opportunities and tenant needs; and (iii) implementing
cost control  management  and systems  that  capitalize on  economies  of  scale
arising  from  the size  and location  of the  Company's portfolio.  The Company
believes that the implementation of these operating practices has increased  the
occupancy and rental revenue of its existing portfolio.
 
    AGGRESSIVE   LEASING.    The  Company   utilizes  its  market  position  and
relationships with  a  broad array  of  brokers  and tenants  to  implement  its
aggressive  leasing efforts  and monitor and  understand the  current and future
space needs  of office  tenants in  its various  submarkets. Since  the  Company
retains  several different brokerage companies as  leasing agents (at least nine
different companies across the four regions and 24 Properties) to implement  its
leasing program, it has a high profile in the brokerage community. This strategy
enables  the  Company  to  attract  and  place  tenants  throughout  all  of the
Properties, thereby improving the Company's penetration in the tenant community.
The Company believes that  not only does the  breadth of its submarket  presence
permit  it to offer a wide variety  of space alternatives to prospective tenants
and to existing tenants whose facility  requirements change over time, but  also
its  leasing agents are  given incentives to locate  tenants to Properties where
they are not the leasing agent.
 
    Management continually strives to be  responsive to tenant needs in  various
other  ways, including by adding tailored  amenities at specific buildings, such
as  lobby  reconfiguration   and  valet-assisted  parking.   The  Company   also
underwrites its acquisitions with sufficient capital to provide for ample tenant
improvements  and  leasing  commissions in  contrast  to many  owners  of office
properties who lack  funds to build  out space  for tenants and  to pay  leasing
commissions.
 
                                       31
<PAGE>
    INTEGRATED  DECISION-MAKING AND RESPONSIVENESS.  In addition to the location
and quality  of the  Properties,  management generally  credits its  ability  to
maintain  its  Properties  at  above-average  market  occupancy  levels  to  the
coordination of its  decision-making team. Acquisition,  renovation and  leasing
activities are coordinated to enhance responsiveness to market opportunities and
tenant  needs.  The Company's  renovation  and construction  executive  plays an
integral role in both its  leasing and acquisition activities. The  acquisition,
leasing  and renovation teams work closely  with the Company's senior management
from the initial meetings  with prospective tenants  or sellers, and  throughout
the negotiation process. This integrated approach permits the Company to analyze
the economic terms and costs (including tenant build-out and retrofitting costs)
for  each lease on  a timely and efficient  basis throughout lease negotiations.
With respect  to acquisitions,  the Company  can quickly  analyze the  costs  of
upgrades  and lease-up potential. The  Company is able to  commit to leasing and
acquisition terms quickly,  facilitate timely  deal execution  and build-out  of
space for prospective tenants and minimize downtime between lease rollovers.
 
    COST  CONTROL OPERATING EFFICIENCIES.   The size  and geographic location of
the Company's  portfolio  permit  it  to enhance  portfolio  value  by  lowering
operating  costs and expenses, compared to single-site ownership and management.
The Company  seeks  to capitalize  on  economies  of scale  resulting  from  the
Southern  California geographic focus of the  portfolio and the maintenance of a
centralized state of the art accounting system  for cost control at each of  the
Properties.  The  Company  also  strives  to  minimize  overhead  costs  through
maintenance of four  regional offices, each  of which has  responsibility for  a
number  of Properties within  specific submarkets, and  by controlling corporate
general and administrative expenses.
 
GROWTH STRATEGIES
 
    EXTERNAL GROWTH:    The  Company  believes  that  significant  opportunities
continue  to exist  to acquire  additional office  properties that:  (i) provide
attractive initial yields with  significant potential for  growth in cash  flow;
(ii)  are in  desirable locations within  submarkets which  the Company believes
have  economic  growth  potential;  and   (iii)  are  underperforming  or   need
renovation,  and  which  therefore  provide  opportunities  for  the  Company to
increase the cash flow  and value of such  properties through active  management
and aggressive leasing.
 
    The  Company  intends  to  continue  to  acquire  office  properties  within
submarkets  in   Southern  California   which  the   Company  believes   present
opportunities  for long-term  stable and rising  rental rates  due to employment
growth,  population  movements  within  the  region  and  restrictions  on   new
development.  The Company generally targets properties which are underperforming
or need renovation  and offer  opportunities for  the Company  to implement  its
value-added  strategy to increase cash flow. For  example, as of April 30, 1996,
the Properties  owned by  the Company  for more  than one  year had  a  weighted
average occupancy rate of approximately 87%, compared to approximately 78% as of
the respective dates such Properties were acquired.
 
    In  addition, the Company  will seek to acquire  properties at a significant
discount to replacement cost in the  relevant submarket. Since the beginning  of
1993,  the Company has acquired its Properties in suburban Los Angeles County at
a cost which the Company believes is significantly below replacement cost  based
on  estimates of replacement costs  of Class A office  buildings included in the
C&W Market Study. See "Southern California Economy and Office Markets."
 
    The Company believes it has certain competitive advantages which enhance its
ability to identify and capitalize on acquisition opportunities, including:  (i)
management's  significant local  market expertise,  experience and  knowledge of
properties, submarkets  and potential  tenants  within the  Southern  California
region;  (ii) management's long-standing relationships with tenants, real estate
brokers and institutional and other owners of commercial real estate; (iii)  its
fully  integrated  real estate  operations which  allow  the Company  to respond
quickly to  acquisition  opportunities and  enable  it to  provide  real  estate
management   services  to  third   parties  as  a   means  of  identifying  such
opportunities; (iv) its  access to capital  as a public  company, including  the
Company's $200 million Credit Facility; (v) its ability to acquire properties in
exchange  for  OP Units  or  Common Stock  if the  sellers  so desire;  and (vi)
management's reputation  as an  experienced purchaser  of office  properties  in
Southern California which has the ability to effectively close transactions.
 
                                       32
<PAGE>
    Recent  examples of the Company's ability to identify attractive acquisition
opportunities include the  two Acquisition  Properties, 303  Glenoaks and  12501
East  Imperial Highway Properties. The Property  at 303 Glenoaks is a ten-story,
175,449 square foot, Class A building situated in the Burbank Civic Center area.
The Company believes that the Burbank market, which is adjacent to the very  low
vacancy  Burbank Media District market, affords  it an opportunity to capitalize
on the Burbank market tightness by maximizing rental rates at levels below those
achieved in the  Burbank Media District  and benefiting from  the spill-over  of
tenants  from the Burbank Media  District who either cannot  find space there or
who do not wish to pay the  full Burbank Media District rents. In addition,  the
Company  plans a common area renovation in  order to become even more attractive
to its existing and potential tenant  base. The Property at 12501 East  Imperial
Highway  is a 122,175 square foot, six-story building is located immediately off
Interstate 5, the  primary central,  north-south artery  of California.  Located
between  downtown Los  Angeles and Orange  County, this Property  is occupied by
major tenants, such as  IBM, Mead Corporation, which  runs a training  facility,
and  GTE California, which runs a teleconferencing facility on site. In addition
to taking advantage  of its portfolio-wide  operating efficiencies, the  Company
plans  to decrease operating expenses at  this Property by furnishing management
services from its Property in Anaheim rather than having an on-site manager.
 
    The Company  may also  seek to  take advantage  of management's  development
expertise to develop office space when market conditions support office building
development.  The Company believes, however, that  opportunities exist for it to
continue to acquire  office properties  within selected  submarkets in  Southern
California  at less than  replacement cost and,  therefore, currently intends to
focus on acquisitions rather than development.
 
    INTERNAL GROWTH:  The Company believes that opportunities exist to  increase
cash  flow  from its  existing  portfolio and  that  such opportunities  will be
enhanced as  the Southern  California office  market continues  to improve.  The
Company  intends to  pursue internal  growth by  (i) continuing  to maintain and
improve occupancy rates through active  management and aggressive leasing;  (ii)
realizing  fixed contractual base rental increases  or increases tied to indices
such as the  CPI; (iii) re-leasing  expiring leases at  increasing market  rents
which  are expected to result, over time, from increased demand for office space
in  Southern  California;  (iv)  controlling  operating  expenses  through   the
implementation  of  cost control  management  and systems;  (v)  capitalizing on
economies of scale arising from the  size of its portfolio; and (vi)  increasing
revenue  generated  from  parking  facilities at  certain  Properties  where the
Company is  currently offering  free parking  as an  amenity or  charging  below
market rates.
 
    (i)   MAINTAINING AND IMPROVING OCCUPANCY  RATES:  The Company believes that
it has been successful in attracting,  expanding and retaining a diverse  tenant
base  by  actively managing  its office  properties with  an emphasis  on tenant
retention and satisfaction. The Company strives to be responsive to the needs of
individual tenants  through its  on-site professional  management staff  and  by
providing  tenants  with alternative  space  within the  Company's  portfolio to
accommodate  their  changing  space  requirements.  The  Company's  success   in
maintaining  and  improving occupancy  rates is  demonstrated,  in part,  by the
number of existing tenants  which have renewed or  released their space,  leased
additional  space  to support  their extension  needs, or  moved to  other space
within the Company's portfolio. The Company has achieved a tenant retention rate
of approximately  79% (based  on  square feet  renewed) from  inception  through
December  31,  1995.  See  "Business  and  Properties  --  Tenant  Retention and
Expansions." The  Company  also seeks  to  improve occupancies  by  aggressively
marketing   available  space  within  its  portfolio.  As  of  April  30,  1996,
approximately 487,000 rentable  square feet were  unleased within the  Company's
portfolio.
 
    (ii)   CONTRACTUAL  BASE RENTAL INCREASES:   The Company  expects to achieve
internal growth in cash flow through  leases which contain provisions for  fixed
contractual  rental increases (including increases from  free or partial rent to
full rent) or increases which are tied to indices such as the CPI. Between March
31, 1996 and  July 31,  1997, the  contractual base  rents under  leases in  the
Company's  portfolio are expected  to increase by  an aggregate of approximately
$1.1 million on  an annual basis  due to fixed  contractual rent increases  (not
including  increases from free or  partial rent to full  rent or increases which
are tied to indices such as the CPI).
 
                                       33
<PAGE>
    (iii)   RE-LEASING EXPIRING  LEASES TO  INCREASING MARKET  RENTS:   Although
there  can be  no assurances in  this regard,  the Company believes  that as the
commercial real estate market in Southern California continues to improve, there
will be increasing  demand for office  space and declining  vacancies which  are
expected  to result, over time, in increasing market rents. The Company believes
it would  have  significant opportunities  to  increase cash  flow  during  such
periods  of increasing market rents by renewing or re-leasing expiring leases at
the increased market rents.
 
    (iv)   COST CONTROL  MANAGEMENT AND  SYSTEMS:   The Company  seeks to  lower
operating  expenses by implementing cost  control management that capitalizes on
economies of scale  opportunities resulting from  the size and  location of  the
Company's  portfolio. The  Company focuses on  cost control in  various areas of
operations. For  example, the  Company  is seeking  to significantly  lower  its
utility  costs, which constitute over 25% of  the operating costs of most of the
Properties,  through  the  portfolio-wide  installation  of  energy  enhancement
technologies,   which  include   lighting  retrofit,   replacement  of  heating,
ventilation and air conditioning systems, and computer-driven energy  management
systems  which  monitor and  react to  the  climatic requirements  of individual
Properties. The  energy  enhancement  program  is  expected  to  be  implemented
throughout the Properties over the next six months.
 
    (v)    CAPITALIZING  ON ECONOMIES  OF  SCALE:   In  order  to  capitalize on
economies of  scale  arising from  the  size  of the  Company's  portfolio,  the
Company's  property and asset  managers are responsible  for several Properties,
which spreads administrative costs over  such Properties and reduces per  square
foot  administrative expense. In  addition, the Company  believes that insurance
coverage,  parking   operations,  building   and  other   services  and   tenant
improvements  purchased  on  a  portfolio-wide  basis  will  facilitate  further
economies of scale savings.
 
    (vi)  REVENUE FROM PARKING FACILITIES:   The Company owns or leases  parking
facilities which are attached or adjacent to many of the Properties. The Company
currently  provides  free parking  to tenants  at  six of  the Properties  as an
amenity and charges tenants at the remaining Properties at or below market rates
for parking. If the  demand for Southern California  office space increases  and
occupancy  rates  rise, which  the Company  believes is  the trend,  the Company
believes that there may be opportunities to generate additional revenue from the
parking facilities associated with its Properties by charging for parking  which
is  currently provided for  free, increasing below  market rates and maintaining
its arrangements with a limited number of third-party operators of the Company's
parking facilities.
 
                                       34
<PAGE>
                                USE OF PROCEEDS
 
    The net  proceeds to  the Company  from the  Offering, after  deducting  the
estimated  underwriting discounts and commissions  and estimated expenses of the
Offering, are estimated  to be  approximately $345  million (approximately  $397
million  if  the  Underwriters'  overallotment  option  is  exercised  in full),
assuming a public offering price of $20 per share. The net cash proceeds of  the
Offering will be used by the Company as follows: approximately $28.6 million for
payments  to certain Participants  (not including Messrs.  Ziman and Coleman who
will not receive any cash in the Formation Transactions) for their interests  in
the  Arden  Predecessors  and  in  certain of  the  Properties  and  the balance
(approximately $316.4 million) will be contributed to the Operating  Partnership
in  exchange for the  Company's general partner  interest therein. The Operating
Partnership will subsequently use the  proceeds received from the Company  along
with  the  net cash  proceeds of  approximately $102  million from  the Mortgage
Financing borrowed  concurrently with  the Offering,  as follows:  approximately
$392  million  for  repayment of  mortgage  debt  on the  Properties  (which was
incurred to  acquire the  Properties)  and unsecured  lines  of credit  and  the
related  additional and  accrued interest thereon,  including approximately $303
million for repayment of  mortgage debt owed to  Lehman Brothers Holdings  Inc.,
approximately  $35 million for payment of the purchase price for the Acquisition
Properties, and the remaining net proceeds will be used for tenant improvements,
capital expenditure  reserves and  working capital  purposes. See  "Management's
Discussion  and Analysis  of Financial  Condition and  Results of  Operations --
Liquidity and Capital Resources."
 
    If the Underwriters'  overallotment option to  purchase 2,808,000 shares  of
Common Stock is exercised in full, the Company expects to use the additional net
proceeds  (which  will be  approximately  $52.2 million)  to  acquire additional
office properties and for working capital.
 
    Pending application of net proceeds, the Company will invest such portion of
the net proceeds in  interest-bearing accounts and short-term,  interest-bearing
securities,  which are  consistent with the  Company's intention  to qualify for
taxation as a REIT.
 
    The following table sets forth certain information regarding the debt to  be
repaid  upon completion of the Offering, which consists primarily of mortgage or
secured debt  encumbering certain  of the  Properties. The  mortgages and  other
indebtedness to be repaid upon completion of the Offering had a weighted average
interest  rate of approximately 8.512% and  a weighted average remaining term to
maturity of approximately 3.11 years as of March 31, 1996.
 
                                       35
<PAGE>
MORTGAGE DEBT TO BE REPAID
 
<TABLE>
<CAPTION>
                                                                           PRINCIPAL BALANCE
                                                                             OF DEBT TO BE
                                                                              REPAID UPON
                                                                             CONSUMMATION
                                                                          OF THE OFFERING (1)
                                                                          -------------------
                                                                            (IN THOUSANDS)
<S>                                                                       <C>
PROPERTY
- ----------------------------------------------------------------------
9665 Wilshire.........................................................         $ 30,719
Beverly Atrium........................................................           15,631
Century Park Center...................................................           25,184
Westwood Terrace......................................................           20,588
1950 Sawtelle.........................................................           10,200
400 Corporate Pointe..................................................           21,887
Bristol Plaza.........................................................            5,200
Skyview Center........................................................           40,392
The New Wilshire......................................................           21,569
5601 Lindero Canyon...................................................           10,196
Calabasas Commerce Center.............................................           11,569
Woodland Hills Financial..............................................           22,612
16000 Ventura Blvd....................................................           17,151
425 West Broadway.....................................................            4,063
70 South Lake.........................................................           10,785
4811 Airport Plaza Drive..............................................           14,314
4910 Airport Plaza Drive..............................................                 (2)
5000 East Spring......................................................           10,954
100 Broadway..........................................................           20,000(3)
5832 Bolsa............................................................            4,615
Anaheim City Centre...................................................            8,027
Imperial Bank Tower...................................................           41,449
                                                                               --------
    Total.............................................................         $367,105
                                                                               --------
                                                                               --------
</TABLE>
 
- --------------
 
(1) Exact repayment amounts  may differ due to  amortization. These figures  are
    estimated  as of  May 31, 1996  and exclude accrued  and additional interest
    estimated to be approximately  $24.5 million in  the aggregate and  $589,000
    under lines of credit to be assumed by the Operating Partnership.
 
(2) Included in amount listed above for 4811 Airport Plaza Drive.
 
(3) Property was acquired by the Arden Predecessors subsequent to May 31, 1996.
 
                                 DISTRIBUTIONS
 
    Subsequent  to the Offering,  the Company intends  to make regular quarterly
distributions to the holders of its  Common Stock. The Company intends to  cause
the  Operating Partnership initially to  distribute annually approximately 94.5%
of estimated Cash Available for Distribution.  The Company intends to pay a  pro
rata  distribution with respect to  the period commencing on  the closing of the
Offering and ending on December 31, 1996  based upon $0.40 per share for a  full
quarter.  On an annualized basis, this would be $1.60 per share (of which $0.258
may represent a return of capital  for tax purposes), or an annual  distribution
rate  of approximately 8% based on the assumed initial public offering price per
share of $20.00. The Company does not intend to reduce the expected distribution
per share if the Underwriters' overallotment option is exercised. The  following
discussion and the information set forth in the table and footnotes below should
be  read in connection with the financial  statements and notes thereto, the pro
forma financial information and notes  thereto and "Management's Discussion  and
Analysis  of  Financial Condition  and Results  of  Operations --  Liquidity and
Capital Resources" included elsewhere in this Prospectus.
 
                                       36
<PAGE>
    The Company's  estimate of  the Cash  Available for  Distribution after  the
Offering  is based upon pro forma Funds  from Operations for the 12 months ended
March 31, 1996, with certain adjustments based on the items described below.  To
estimate  Cash Available for Distribution for the 12 months ended July 31, 1997,
pro forma Funds  from Operations  for the  12 months  ended March  31, 1996  was
adjusted  (a) without giving effect to  any changes in working capital resulting
from changes in current  assets and current liabilities  (which changes are  not
anticipated  to be material) or the amount of  cash estimated to be used for (i)
investing activities for  development, acquisition and  other activities  (other
than  a reserve  for capital expenditures  and tenant  improvements for renewing
space) and  (ii)  financing activities,  (b)  for certain  known  events  and/or
contractual  commitments that  either occurred subsequent  to March  31, 1996 or
during the 12 months ended March 31, 1996 but were not effective for the full 12
months and  (c) for  certain  non-GAAP adjustments  consisting of  (i)  revising
historical  rent estimates from a GAAP basis  to amounts currently being paid or
due from  tenants and  (ii) an  estimate of  amounts anticipated  for  recurring
tenant  improvements, leasing commissions and capital expenditures. The estimate
of Cash  Available for  Distribution is  being made  solely for  the purpose  of
setting  the initial  distribution and  is not  intended to  be a  projection or
forecast of the  Company's results of  operations or its  liquidity, nor is  the
methodology  upon which such adjustments were  made necessarily intended to be a
basis for determining future distributions. Future distributions by the  Company
will  be at the discretion of the Board  of Directors. There can be no assurance
that any distributions will be made or that the estimated level of distributions
will be maintained by the Company.
 
    The Company  anticipates that  its distributions  will exceed  earnings  and
profits  for income tax  reporting purposes due  to non-cash expenses, primarily
depreciation and  amortization,  to  be  incurred  by  the  Company.  Therefore,
approximately 16.2% (or $0.258 per share) of the distributions anticipated to be
paid  by  the Company  in the  first 12  months subsequent  to the  Offering are
expected to represent a return of capital for federal income tax purposes and in
such event will not be  subject to federal income tax  under current law to  the
extent  such distributions  do not  exceed a stockholder's  basis in  his or her
Common Stock. The  nontaxable distributions  will reduce  the stockholder's  tax
basis  in the Common Stock and, therefore,  the gain (or loss) recognized on the
sale of such Common Stock or upon  liquidation of the Company will be  increased
(or  decreased) accordingly.  The estimated  Cash Available  for Distribution is
anticipated to be in excess  of the annual distribution requirements  applicable
to  REITs.  The  percentage  of  stockholder  distributions  that  represents  a
nontaxable return of capital may vary substantially from year to year.
 
    Federal income tax law requires that a REIT distribute annually at least 95%
of its REIT taxable income. See  "Federal Income Tax Considerations --  Taxation
of  the Company." The  amount of distributions  on an annual  basis necessary to
maintain the Company's  REIT status  based on pro  forma taxable  income of  the
Operating  Partnership for the  12 months ended  March 31, 1996  as adjusted for
certain items  in  the  following  table would  have  been  approximately  $27.3
million.  Under  certain  circumstances, the  Company  may be  required  to make
distributions in excess of Cash Available for Distribution in order to meet such
distribution  requirements.  For   a  discussion   of  the   tax  treatment   of
distributions   to   holders   of   Common  Stock   see   "Federal   Income  Tax
Considerations."
 
    The Company believes that  its estimate of  Cash Available for  Distribution
constitutes  a reasonable  basis for setting  the initial  distribution, and the
Company expects to  maintain its  initial distribution  rate for  the 12  months
subsequent  to  the  Offering  unless  actual  results  of  operations, economic
conditions or other factors  differ from the assumptions  used in the  estimate.
The  Company's actual  results of  operations will  be affected  by a  number of
factors, including  the  revenue received  from  the Properties,  the  operating
expenses  of  the  Company, interest  expense,  the  ability of  tenants  of the
Properties to  meet their  obligations and  unanticipated capital  expenditures.
Variations  in the net proceeds from the Offering as a result of a change in the
initial public offering price or the exercise of the Underwriters' overallotment
option may affect the  Cash Available for Distribution  and the payout ratio  of
Cash  Available For  Distribution and  available reserves.  No assurance  can be
given that the Company's estimate will  prove accurate. Actual results may  vary
substantially from the estimate.
 
                                       37
<PAGE>
    The  following  table  describes the  calculation  of pro  forma  Funds from
Operations for the 12  months ended March  31, 1996 and  the adjustments to  pro
forma Funds from Operations for the 12 months ended March 31, 1996 in estimating
initial  Cash Available for Distribution  for the 12 months  ended July 31, 1997
(amounts in thousands except share data, per share data, square footage data and
percentages):
 
<TABLE>
<S>                                                                       <C>
Pro forma income before minority interest for the year ended December
  31, 1995............................................................    $25,665
Pro forma income before minority interest for the three months ended
  March 31, 1995......................................................     (6,146)
Pro forma income before minority interest for the three months ended
  March 31, 1996......................................................      7,053
                                                                          -------
Pro forma income before minority interest for the 12 months ended
  March 31,
  1996................................................................     26,572
Plus pro forma real estate depreciation for the 12 months ended March
  31,
  1996 (1)............................................................     11,010
Plus pro forma amortization of leasing commissions and tenant
  improvements for the 12 months ended March 31, 1996 (2).............        854
                                                                          -------
Pro forma Funds from Operations for the 12 months ended March 31,
  1996................................................................     38,436
 
Adjustments:
  Provision for assumed expiring leases (3)...........................     (1,185)
  Incremental pro forma lease adjustment (4)..........................      1,840
  Contractual rent increases (5)......................................      4,278
  Increase in tenant reimbursements (6)...............................        855
  Net increase in property operating expenses relating to new leases
   (7)................................................................       (307)
  Contractual increase in parking income and other income (8).........        167
  Net effect of straight lining of rents (9)..........................     (3,799)
  Estimated recurring non-revenue enhancing tenant improvements and
   leasing commissions (10)...........................................     (3,393)
  Estimated recurring non-revenue enhancing capital expenditures
   (11)...............................................................       (606)
                                                                          -------
Total estimated Cash Available for Distribution for the 12 months
  ended July 31, 1997.................................................    $36,286
Total estimated cash distributions....................................    $34,290
Less: Minority interests' share of estimated Cash Available for
  Distribution........................................................      4,331
                                                                          -------
Estimated cash distributions to stockholders of the Company (12)......    $29,959
Estimated initial cash distribution per share (13)....................    $  1.60
Estimated Cash Available for Distribution payout ratio (14)...........       94.5%
</TABLE>
 
- --------------
(1) Pro forma depreciation for the year ended December 31, 1995 of $11,007  plus
    pro  forma depreciation for the three months  ended March 31, 1996 of $2,772
    minus pro forma depreciation  for the three months  ended March 31, 1995  of
    $2,769.
 
(2)  Pro forma amortization  of leasing commissions  and tenant improvements for
    the year ended  December 31,  1995 of $683  plus pro  forma amortization  of
    leasing commissions and tenant improvements for the three months ended March
    31,  1996 of  $337 minus pro  forma amortization of  leasing commissions and
    tenant improvements for the three months ended March 31, 1995 of $166.
 
(3) The  provision for  assumed  expiring leases  represents adjustments  for  a
    possible  reduction in occupancy and  in rental rates and  consists of (i) a
    reduction of $952 which represents 25% of the rent payable under all  leases
    expiring  from May 31, 1996 through July  31, 1997 assuming that 25% of such
    expiring leases will  not be renewed  (and for the  period that such  leases
    will  not generate rent during the 12 months ended July 31, 1997) and (ii) a
    reduction of $233 for the  75% of leases assumed  to be renewed between  May
    31,  1996 and July 31, 1997 assuming that  such leases renew at the lower of
    the Company's
 
                                       38
<PAGE>
    historical contractual  rental  rate during  the  past nine  months  or  the
    Company's  analysis  of the  market rate.  The Company's  historical renewal
    rate, based on square footage, from  inception through December 31, 1995  is
    79%.
 
(4) Reflects rental increases and decreases from 1995 and 1996 completed leasing
    transactions  relating to the Properties and  consists of (i) a net increase
    of $2,197 representing additional minimum rent from new leases and  renewals
    executed  between March 31, 1996 and May  31, 1996 to the extent such leases
    generate additional minimum  rents for the  12 months ended  July 31,  1997,
    (ii)  a decrease  of $681  representing the  decrease in  rental revenue for
    leases that expired between March  31, 1996 and May  31, 1996 to the  extent
    such  leases generated rent for the 12 months ended March 31, 1996 and (iii)
    a net amount of $324 representing the  full year minimum rent in effect  for
    existing  leases on which rent is only partially reflected in the historical
    financial statements of the Arden Predecessors for the 12 months ended March
    31, 1996 and the decrease in rental revenue for leases expired during the 12
    months ended March  31, 1996 to  the extent rental  revenue was included  in
    rental revenue for the 12 months ended March 31, 1996.
 
(5)  Represents net contractual rent increases for all leases in effect at March
    31, 1996 which will be realized  during the 12-month period ending July  31,
    1997 for the portion of the year each such lease will be in effect. Includes
    increases  of $3,194 relating to  leases which were in  free or partial rent
    periods at March 31,  1996 and $1,084 relating  to fixed contractual  rental
    increases.
 
(6) Represents the contractual increase in tenant reimbursements attributable to
    leases executed prior to March 31, 1996 based upon the estimated expenses to
    be reimbursed by the tenants for the 12 months ended July 31, 1997 in excess
    of the estimated base year amounts.
 
(7) Represents the estimated net increase in operating expenses based on the net
    increase  in the occupancy of  space for leases signed  during the 12 months
    ended March 31, 1996, and between March 31, 1996 and May 31, 1996, offset by
    the decrease in  occupancy from  actual lease terminations  through May  31,
    1996  and for the provision  for expiring leases (See  (3) above) as if such
    increases and decreases were in effect for the full 12 months ended July 31,
    1997.
 
(8) Represents net additional parking revenue of $116 to be received for the  12
    months  ended July 31,  1997, relating to leases  signed subsequent to March
    31, 1996 and the increase in management fee revenue of $51 for the 12 months
    ending July  31,  1997 relating  to  three third-party  property  management
    contracts  pursuant to which the Company  began receiving fees subsequent to
    March 31,  1996. The  Company believes  that it  can manage  the  additional
    properties  with its existing  resources and, accordingly,  there will be no
    additional increase  in its  operating expenses  attributable to  these  new
    contracts.  The  management contracts  are terminable  upon  15 to  60 days'
    notice although the Company is not aware  of any intention to cancel any  of
    these management contracts.
 
(9)  Represents the effect of adjusting straight-line rental revenue included in
    pro forma  net income  for  the 12  months ended  March  31, 1996  from  the
    straight-line  accrual basis under  GAAP to amounts  currently being paid or
    due from tenants.
 
(10) Reflects  non-revenue  enhancing  capital tenant  improvements  ("TI")  and
    leasing  commissions ("LC") for the Properties  for the 12 months ended July
    31, 1997 based on the weighted average TI and LC
 
                                       39
<PAGE>
    expenditures per  square  foot for  renewed  and re-tenanted  space  at  the
    Properties  since the Company's  inception multiplied by  the average annual
    square feet of  leased space for  which leases expire  during the five  year
    period ending December 31, 2001 (387,000 square feet).
 
<TABLE>
<CAPTION>
                                                                             THREE
                                                    YEAR ENDED DECEMBER 31,   YEAR
                                                    -----------------------  WEIGHTED
                                                    1993   1994       1995   AVERAGE
                                                    -----  -----     ------  ------
<S>                                                 <C>    <C>       <C>     <C>
RENEWAL
TI per square foot................................  $3.58  $2.23     $ 8.05(i) $4.83
LC per square foot................................  $ .09  $3.44     $ 2.28  $2.87
                                                    -----  -----     ------  ------
    Total TI and LC per square foot...............  $3.67  $5.67     $10.33  $7.70
                                                    -----  -----     ------  ------
                                                    -----  -----     ------  ------
RE-TENANTED (ii)
TI per square foot................................  $2.22  $9.04     $ 9.82  $9.16
LC per square foot................................  $ .31  $2.72     $ 3.05  $2.81
                                                    -----  -----     ------  ------
    Total TI and LC per square foot...............  $2.53  $11.76    $12.87  $11.97
                                                    -----  -----     ------  ------
                                                    -----  -----     ------  ------
</TABLE>
 
       ---------------------
 
       (i)  Includes tenant  improvement costs relating  to one  lease signed at
           Anaheim City  Centre  for  which  the  Company  incurred  substantial
           renovation  costs in  connection with  a full  floor retrofit. Tenant
           improvement costs for  the remaining leases  renewed in 1995  equaled
           $4.67 per square foot.
 
       (ii) Does not include shell space build out for 87,395 square feet. Shell
           space  remaining at the  Properties is less than  2% of the aggregate
           rentable square footage of the Properties.
 
<TABLE>
<CAPTION>
                                              THREE YEAR            AVERAGE ANNUAL
                                               WEIGHTED             SQUARE FOOTAGE         RATE OF
                                            AVERAGE TI AND            EXPIRING IN          RENEWALS/        TOTAL
                                          LC PER SQUARE FOOT           1997-2001           RE-TENANTED       COST
                                          ------------------        ---------------        -------        ----------
<S>                                       <C>                  <C>  <C>               <C>  <C>       <C>  <C>
Renewal.................................        $ 7.70           x      387,000         x    75%(i)    =  $2,235,000
Re-tenanted.............................        $11.97           x      387,000         x    25%       =   1,158,000
                                                                                                          ----------
                                                                                                          $3,393,000
                                                                                                          ----------
                                                                                                          ----------
</TABLE>
 
       ---------------------
 
       (i) The historical 3-year weighted  average renewal rate for the  Company
           is 79%.
 
(11)  The reserve for  recurring non-revenue enhancing  capital expenditures for
    the 12 months ended July 31, 1997  was based upon an annual cost per  square
    foot  of $.15. Based on its historical experience, the Company believes that
    this  amount   reasonably   approximates  the   annual   recurring   capital
    expenditures for the Properties. For the years ended December 31, 1993, 1994
    and 1995, the weighted average cost per square foot was $.02, $.06 and $.15,
    respectively.  The Company's weighted average capital expenditure per square
    foot per year since inception is $.10.
 
(12) The  Company's  share of  estimated  cash  distributions is  based  on  its
    approximately 87.37% ownership of the aggregate equity capitalization of the
    Operating Partnership.
 
(13)  Based  on  a  total  of  18,725,000  shares  to  be  outstanding following
    consummation of the Offering. The Company estimates that approximately 16.2%
    of the estimated cash  distributions for the 12  months ended July 31,  1997
    will represent a return of capital for federal income tax purposes.
 
(14) Calculated by dividing total estimated cash distributions by estimated Cash
    Available for Distribution for the 12 months ended July 31, 1997.
 
                                       40
<PAGE>
                                 CAPITALIZATION
 
    The following table sets forth the combined historical capitalization of the
Arden  Predecessors and the pro forma  combined capitalization of the Company as
of March 31, 1996, as adjusted to give effect to the Formation Transactions, the
Offering and use of the net proceeds  from the Offering and from the  concurrent
Mortgage  Financing as  set forth under  "Use of Proceeds."  The information set
forth in the table  should be read in  connection with the financial  statements
and  notes thereto,  the pro forma  financial information and  notes thereto and
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations  --  Liquidity  and  Capital Resources"  included  elsewhere  in this
Prospectus.
 
<TABLE>
<CAPTION>
                                                                          MARCH 31, 1996
                                                                        -------------------
                                                                        COMBINED
                                                                        HISTORICAL PRO FORMA
                                                                        --------  ---------
                                                                          (IN THOUSANDS)
<S>                                                                     <C>       <C>
Debt:
  Mortgage Loans (1)..................................................  $352,805  $103,830
  Line of Credit......................................................       589     --
Minority interest in Operating Partnership............................     --       41,103
Stockholders' equity:
  Preferred Stock, $.01 par value, 20,000,000 shares authorized; none
   issued and outstanding.............................................     --        --
  Common Stock, $.01 par value; 100,000,000 shares authorized;
   18,725,000 issued and outstanding (2)..............................     --          187
  Additional Paid-in Capital..........................................     --      284,224
  Owners' Equity......................................................    15,777     --
                                                                        --------  ---------
    Total Owners'/Stockholders' Equity................................    15,777   284,411
                                                                        --------  ---------
      Total Capitalization............................................  $369,171  $429,344
                                                                        --------  ---------
                                                                        --------  ---------
</TABLE>
 
- --------------
(1) See note 4 of  the notes to the combined  financial statements of the  Arden
    Predecessors for information relating to the indebtedness.
 
(2)  Includes shares  of Common  Stock to  be issued  in the  Offering. Does not
    include (i) shares of Common Stock that  may be issued upon the exchange  of
    OP  Units issued in connection with  the Formation Transactions, (ii) shares
    of Common Stock subject to  the Underwriters' overallotment option or  (iii)
    shares  of Common Stock subject to options granted under the Company's Stock
    Incentive Plan.
 
                                       41
<PAGE>
                                    DILUTION
 
    At  March  31,  1996,  the  Company  had  a  net  tangible  book  value   of
approximately  $15.8 million. After giving effect to  (i) the sale of the shares
of Common Stock offered hereby (at  an assumed initial public offering price  of
$20  per share) and the receipt by  the Company of approximately $345 million in
net proceeds  from  the Offering,  after  deducting underwriting  discounts  and
commissions and estimated Offering expenses, (ii) the repayment of approximately
$392  million of indebtedness under mortgage  debt and unsecured lines of credit
(including approximately $24.5  million of accrued  and additional interest,  of
which  approximately $20  million was not  accrued as  of March 31,  1996 on the
combined balance sheet of  the Arden Predecessors), the  pro forma net  tangible
book  value at March 31, 1996 would have  been $284 million, or $15.19 per share
of Common Stock. This  amount represents an immediate  increase in net  tangible
book  value  of $9.36  per share  to the  existing  holders of  OP Units  and an
immediate dilution in pro forma  net tangible book value  of $4.81 per share  of
Common Stock to new investors. The following table illustrates this dilution:
 
<TABLE>
<S>                                                                     <C>    <C>
Assumed initial public offering price per share.......................         $20.00
  Net tangible book value per share prior to the Offering (1).........  $5.83
  Increase in net tangible book value per share attributable to the
   Offering (2).......................................................  $9.36
Pro forma net tangible book value after the Offering (3)..............         $15.19
                                                                               ------
Dilution in net tangible book value per share of Common Stock to new
  investors (4).......................................................         $ 4.81
                                                                               ------
                                                                               ------
</TABLE>
 
- --------------
(1)  Net tangible book  value per share  prior to the  Offering is determined by
    dividing net tangible book value of the Company (total tangible assets  less
    total  liabilities and minority interest) by  the number of shares of Common
    Stock issuable  upon the  exchange  of all  OP Units  to  be issued  to  the
    Participants in connection with the Formation Transactions.
 
(2)  Based on an  assumed initial public  offering price of  $20.00 per share of
    Common Stock and after deducting Underwriters' discounts and commissions and
    estimated Offering expenses.
 
(3) Based on total pro forma net tangible book value of $284 million divided  by
    the  total number of shares of Common  Stock. There is no impact on dilution
    attributable to the issuance of Common Stock in exchange for OP Units to  be
    issued to the Participants since such OP Units would be exchanged for Common
    Stock on a one-for-one basis.
 
(4)  Dilution is determined by subtracting net  tangible book value per share of
    Common Stock after  the Offering  from the assumed  initial public  offering
    price for a share of Common Stock.
 
    The  following table summarizes, on  a pro forma basis  giving effect to the
Offering and the Formation Transactions, the number of shares of Common Stock to
be sold by the Company in the Offering  and the number of OP Units to be  issued
to  the  Participants in  connection with  the  Formation Transactions,  the net
tangible book  value as  of March  31, 1996  of the  assets contributed  in  the
Formation   Transactions  and  the  net  tangible  book  value  of  the  average
contribution per share based on total contributions.
 
<TABLE>
<CAPTION>
                                                                         COMMON STOCK/      BOOK VALUE OF     BOOK VALUE OF
                                                                        OP UNITS ISSUED     CONTRIBUTIONS          AVG.
                                                                        ---------------   -----------------    CONTRIBUTION
                                                                        SHARES  PERCENT      $      PERCENT   PER SHARE/UNIT
                                                                        ------  -------   --------  -------   --------------
                                                                                 (IN THOUSANDS EXCEPT PERCENTAGES)
<S>                                                                     <C>     <C>       <C>       <C>       <C>
New investors in the Offering.........................................  18,725   87.37%   $345,472   95.63%     $20.00(1)
OP Units issued to the Participants...................................   2,706   12.63%   $ 15,777    4.37%     $ 5.83
                                                                        ------  -------   --------  -------
  Total...............................................................  21,431  100.00%   $361,249  100.00%
                                                                        ------  -------   --------  -------
                                                                        ------  -------   --------  -------
</TABLE>
 
- --------------
(1) Before  deducting  underwriting  discounts  and  commissions  and  estimated
    expenses of the Offering.
 
                                       42
<PAGE>
                        SELECTED COMBINED FINANCIAL DATA
 
    The   following  sets  forth  selected   combined  financial  and  operating
information on a pro forma  basis for the Company  and on a combined  historical
basis  for the Arden  Predecessors. The following information  should be read in
conjunction with the financial statements and  notes thereto of the Company  and
of  the Arden Predecessors  included elsewhere in  this Prospectus. The selected
combined  historical   financial  and   operating  information   of  the   Arden
Predecessors at December 31, 1995 and 1994, and for the years ended December 31,
1995,  1994 and  1993, has been  derived from the  historical combined financial
statements audited by Ernst & Young LLP, independent auditors, whose report with
respect thereto is included elsewhere in this Prospectus. The selected  combined
financial  and operating information  for the three months  ended March 31, 1996
and March  31, 1995  has  been derived  from  the unaudited  combined  financial
statements of the Arden Predecessors included elsewhere in this Prospectus.
 
    The  unaudited pro forma  financial and operating  information for the three
months ended March 31, 1996 and the year ended December 31, 1995 is presented as
if the  Offering, the  Formation  Transactions (including  the purchase  of  the
Acquisition  Properties), and the  acquisitions of the  1996 Acquired Properties
and the 1995  Acquired Properties had  all occurred  by March 31,  1996 for  the
combined  balance sheet  and at  the beginning of  the period  presented for the
combined statements of operations. The pro forma balance sheet information  also
gives  effect to the  recording of minority  interest for OP  Units, as if these
transactions occurred on March 31, 1996. The pro forma financial information  is
not  necessarily indicative of what the  actual financial position or results of
the Company would have  been as of  and for the periods  indicated, nor does  it
purport  to  represent the  Company's future  financial  position or  results of
operations.
 
                                       43
<PAGE>
                          THE COMPANY (PRO FORMA) AND
                    ARDEN PREDECESSORS (COMBINED HISTORICAL)
 
<TABLE>
<CAPTION>
                                              THREE MONTHS ENDED MARCH 31,
                                                                                            YEAR ENDED DECEMBER 31,
                                             ------------------------------  ------------------------------------------------------
                                                              COMBINED
                                             PRO FORMA       HISTORICAL      PRO FORMA              COMBINED HISTORICAL
                                             ---------   ------------------  ---------   ------------------------------------------
                                               1996        1996      1995      1995        1995       1994      1993    1992   1991
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA, PERCENTAGES AND NUMBER OF PROPERTIES)
<S>                                          <C>         <C>       <C>       <C>         <C>        <C>       <C>       <C>    <C>
OPERATING DATA:
Revenue:
  Rental...................................   $16,562    $ 12,471  $  4,667   $66,691    $  24,442  $ 11,928  $  3,155  $--    $--
  Tenant reimbursements....................       859         758       128     3,019          822       509        38   --    --
  Parking..................................     1,596       1,267       268     5,895        1,665       741       284   --    --
  Other....................................       542         558       325     2,441        1,653       734       313    324   11
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
    Total revenue..........................    19,559      15,054     5,388    78,046       28,582    13,912     3,790    324   11
EXPENSES:
  Property operating, taxes, insurance and
   ground rent.............................     5,462       4,579     1,532    24,546        8,679     3,810     1,163   --    --
  Property general and administrative......       887         732       282     3,991        1,588       735       349   --    --
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
    Total property operating expenses......     6,349       5,311     1,814    28,537       10,267     4,545     1,512   --    --
  General and administrative expenses......       934         364       373     3,735        1,377       689       386    471    7
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
  Income before interest, depreciation and
   amortization............................    12,276       9,379     3,201    45,774       16,938     8,679     1,892   (147)   4
  Depreciation and amortization............     3,109       2,396       879    11,690        4,373     2,184       528      2  --
  Interest expense.........................     2,114       8,832     2,241     8,419       13,780     5,109       673      9  --
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
Income (loss) before extraordinary loss....     7,053      (1,849)       81    25,665       (1,215)    1,385       691   (158)   4
Extraordinary loss.........................     --          --        --        --          --           601     --      --
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
Income (loss) before minority interest.....     7,053      (1,849)       81    25,665       (1,215)      784       691   (158)   4
Minority interest..........................       891       --        --        3,242       --         --        --      --    --
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
Net income (loss)..........................   $ 6,162    $ (1,849) $     81   $22,423    $  (1,215) $    784  $    691  $(158) $ 4
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
                                             ---------   --------  --------  ---------   ---------  --------  --------  -----  ----
Net income per common share................   $   .33                         $  1.20
                                             ---------                       ---------
                                             ---------                       ---------
OTHER DATA:
Funds from Operations......................   $10,162    $    547  $    960   $37,355    $   3,131  $  3,565  $  1,216  $(158) $ 4
Cash flows from operating activities.......     --          1,370       109     --           4,231     1,196     1,681   (258)   7
Cash flows from investing activities.......     --        (95,854)  (20,086)    --        (150,022)  (45,804)  (62,907)  --    --
Cash flows from financing activities.......     --         94,006    19,349     --         146,531    43,584    62,971    250    1
Number of Properties owned at period end...        24          21         9        24           17         8         3   --    --
Gross rentable square feet of Properties
  owned at period end......................     4,042       3,552     1,309     4,042        2,632     1,131       531   --    --
Occupancy at period end of Properties owned
  at period end............................       88%         88%       83%       88%          88%       82%       84%   --    --
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                      DECEMBER 31,
                                                                                         ---------------------------------------
                                                                      MARCH 31, 1996
                                                                   --------------------            COMBINED HISTORICAL
                                                                               COMBINED  ---------------------------------------
                                                                   PRO FORMA   HISTORICAL   1995     1994     1993    1992  1991
                                                                   ---------   --------  --------  --------  -------  ----  ----
                                                                                          (IN THOUSANDS)
<S>                                                                <C>         <C>       <C>       <C>       <C>      <C>   <C>
BALANCE SHEET DATA:
Commercial office properties -- net of accumulated
  depreciation...................................................  $414,825    $345,633  $252,082  $106,135  $62,392  --    --
Total assets.....................................................   435,866    380,290    277,643   113,054   65,808  134    10
Mortgage loans payable and unsecured lines of credit.............   103,830    353,394    253,996    94,432   60,975  250   --
Total liabilities................................................   110,352    364,513    262,955    97,081   62,330  287     5
Minority interest................................................    41,103      --         --        --       --     --    --
Owners'/Stockholders' equity.....................................   284,411     15,777     14,688    15,973    3,478  (153)   5
</TABLE>
 
                                       44
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
    The  following  discussion  should  be  read  in  conjunction  with Selected
Financial  Data  and  the  financial  statements  appearing  elsewhere  in  this
Prospectus. Where appropriate, the following discussion includes analysis of the
effects  of the Formation Transactions and  the Offering, including the Mortgage
Financing and  the purchase  of the  Acquisition Properties.  These effects  are
reflected  in  the pro  forma  condensed combined  financial  statements located
elsewhere in this Prospectus.
 
    The Company receives income primarily from rental revenue (including  tenant
reimbursements)  and parking revenue from commercial office properties, and to a
lesser extent, from the management of certain properties owned by third parties.
The Company has acquired its current  portfolio over the last three years,  with
approximately 15% of the Properties (as a percentage of pro forma rental revenue
for  the three  months ended  March 31,  1996) acquired  in calendar  year 1993,
approximately 12% of the Properties acquired in 1994, approximately 34% acquired
in 1995,  and the  balance  (39%) acquired  or to  be  acquired in  the  current
calendar  year. As a result of the Company's aggressive acquisition program, the
financial data shows significant increases in  total revenue from year to  year,
largely  attributable to the acquisitions during  each such year and the benefit
of a full period of effective  rental and other revenue for Properties  acquired
in  the preceding year. For the foregoing  reasons, the Company does not believe
its year to year and quarter to quarter financial data are comparable.
 
    In addition to  increases in revenue,  the Company also  believes that  cost
savings will be achieved through the economies of scale achieved in managing its
Properties  as  the portfolio  increases in  size.  For example,  total property
operating expense (which is defined as property operating , taxes, insurance and
ground rent expenses and property  general and administrative expenses) for  the
Properties  that were owned for the entire three months ended March 31, 1995 and
March 31, 1996 decreased 3% or  $59,000. Similarly, for the three months  ending
March  31, 1995 and March 31,  1996 general and administrative expenses declined
by 2% and also decreased  to 2% of total revenue  from 7% of total revenue.  The
Company  expects  that  general  and administrative  expenses  will  continue to
decline as a percentage of total revenue.
 
    The Company expects that the more significant part of its revenue growth  in
the next one to two years will come from additional acquisitions and contractual
rent  increases  rather than  from occupancy  and market  rent increases  in its
current portfolio. On the other hand, the Company believes that if the  Southern
California office rental market continues to improve, then rental rate increases
will  become  a more  substantial  part of  its  revenue growth  over  time. See
"Business and Growth Strategies -- Growth Strategies."
 
RESULTS OF OPERATIONS
 
    COMPARISON OF THREE MONTHS ENDED MARCH 31, 1996 TO THREE MONTHS ENDED  MARCH
31,  1995.  During the  first quarter of 1996,  the Arden Predecessors purchased
four  Properties  resulting  in  an  increase  in  real  estate  investments  of
approximately  $95 million. Operating income (which  is defined as total revenue
less total property operating expenses increased  by $6.2 million for the  three
months  ended March 31, 1996 compared to  the three months ended March 31, 1995.
This 173% increase is due  to a $9.7 million or  179% increase in total  revenue
generated from the Properties for the three months ended March 31, 1996 compared
to  the three  months ended March  31, 1995.  The increase in  total revenue was
offset  in  part  by  an  increase   in  property  operating  and  general   and
administrative expenses of $3.5 million or 193% for the three months ended March
31, 1996 compared to the three months ended March 31, 1995.
 
    Rental  revenue increased by $7.8 million or 167% for the three months ended
March 31, 1996 compared to the three  months ended March 31, 1995. The  increase
in  rental  revenue resulted  principally  from a  full  three months  of rental
revenue from Properties acquired during calendar year 1995, eight of which  were
acquired after March 31, 1995 and partial quarter rental revenue from Properties
acquired  during the three months ended March  31, 1996. Rental revenue from the
calendar year  1995 acquisition  Properties increased  to $5.5  million for  the
three  months ended March 31,  1996, representing a full  three months of rental
revenue, from $106,000 in the prior  period. Rental revenue associated with  the
1996
 
                                       45
<PAGE>
acquisition  Properties added an additional approximately $2.2 million to rental
revenue during  the three  months  ended March  31,  1996. Rental  revenue  also
increased  as a result  of contractual base  rent increases on  leases in effect
during both  periods and  due  to improvement  in  occupancy ratios  at  certain
Properties.  Occupancy  rose  from 83%  to  88%  on a  portfolio-wide  basis for
Properties owned at both March 31, 1996 and 1995.
 
    Tenant reimbursements and other  revenue increased by  $863,000 or 191%  for
the  three months ended March 31, 1996  compared to the three months ended March
31, 1995.  The increase  in  tenant reimbursements  and other  revenue  resulted
principally  from a full  three months of  tenant reimbursements from Properties
acquired during calendar  year 1995  and partial  quarter tenant  reimbursements
from  Properties acquired during  the three months ended  March 31, 1996. Tenant
reimbursements from  the  calendar year  1995  acquisition Properties  added  an
additional  $413,000 for the  three months ended March  31, 1996, representing a
full three  months of  tenant reimbursements.  Tenant reimbursements  associated
with  the 1996  acquisition Properties  added an  additional $141,000  to rental
revenue  during  the  three  months   ended  March  31,  1996.  Other   revenue,
representing   primarily  management  fees  for  third  party-owned  properties,
increased by 72% for the three months ended March 31, 1996 compared to the prior
period.
 
    Parking revenue increased by $1.0 million or 373% for the three months ended
March 31, 1996 compared to the three  months ended March 31, 1995. The  increase
resulted principally from a full three months of parking revenue from Properties
acquired  during calendar  year 1995  and partial  quarter parking  revenue from
Properties acquired  during  the three  months  ended March  31,  1996.  Parking
revenue from the calendar year 1995 acquisition Properties increased to $799,000
for  the three months ended March 31,  1996, representing a full three months of
parking revenue, from  $1,000 in  the prior period.  Parking revenue  associated
with  the 1996  acquisition Properties added  an additional  $171,000 to parking
revenue during the three months ended March 31, 1996.
 
    For the three months ended March 31, 1996 and 1995, total property operating
expenses were $5.3 million, or 40% of rental revenue and tenant  reimbursements,
and   $1.8  million,  or  38%  of  rental  revenue  and  tenant  reimbursements,
respectively.  The  increase  in   property  operating  expenses  is   primarily
attributable to the Properties acquired during calendar year 1995 and during the
three  months  ended  March  31,  1996  and  the  expenses  associated  with the
absorption of vacant rentable space. The increase in property operating expenses
from the three months ended March 31,  1995 to the three months ended March  31,
1996  resulting from the acquisition of Properties during the three months ended
March 31,  1996 was  approximately  $1.2 million.  In addition,  total  property
operating  expenses increased by $2.3 million as a result of a full three months
of operations  for the  Properties  acquired in  1995, and  the  above-described
increase  in occupancy at the Properties owned  at both March 31, 1996 and 1995.
Total property operating expenses related to Properties owned by the Company for
the entire three months ended March 31, 1995 and 1996 decreased 3% or $59,000.
 
    General and administrative expenses decreased by $9,000 or 2% for the  three
months  ended March 31, 1996 compared to  the three months ended March 31, 1995.
General and administrative expenses  during the 1996 period  also fell to 2%  of
total  revenue compared to 7% of total revenue during the 1995 period due to the
economies of scale  associated with  adding additional  properties. The  Company
believes  that because it will not need  to hire significant new staff to manage
its current portfolio and to acquire new properties, general and  administrative
expenses as a percentage of total revenue should continue to fall.
 
    Interest  expense includes interest at the  contractual rate of the mortgage
loans amortization of the  loan fees paid at  origination, and accrual of  other
interest payable upon the retirement of the debt. Interest expense for the three
months  ended March 31, 1996 was  approximately $8.8 million, including interest
payable upon the retirement of certain mortgage loans of $2.1 million.  Interest
expense  increased by  approximately $6.6 million  or 294% for  the three months
ended March  31,  1996  compared to  the  three  months ended  March  31,  1995,
primarily  as a  result of the  increase in  mortgage loans payable  to fund the
calendar year 1995 acquisitions  and the acquisitions  that occurred during  the
three  months ended  March 31,  1996. The  interest expense  associated with the
mortgage loans incurred during the three months ended
 
                                       46
<PAGE>
March 31, 1996  was approximately $1.6  million. In addition,  the three  months
ended  March 31, 1996 included a full quarter of interest expense for Properties
acquired  during  calendar  year  1995,  which  increased  interest  expense  by
approximately $4.8 million.
 
    Depreciation  and amortization increased  by $1.5 million  or 173% primarily
due to the calendar year 1995 acquisitions and the acquisitions during the three
months ended March 31, 1996.
 
    As a result of the foregoing, the Company had a net loss of $1.8 million for
the three months ended March 31, 1996 compared to net income of $81,000 for  the
prior period.
 
    The  following  is a  comparison of  the operating  data for  the Properties
("Same Store Properties")  that were  owned for  the entire  three months  ended
March 31, 1995 and March 31, 1996:
 
<TABLE>
<CAPTION>
                                                                        MARCH 31, 1996   MARCH 31, 1995
                                                                        --------------   --------------
<S>                                                                     <C>              <C>
Revenue:
  Rental..............................................................    $4,534,000       $4,561,000
  Tenant reimbursements...............................................       204,000          127,000
  Parking.............................................................       297,000          267,000
  Other...............................................................        82,000          227,000
                                                                        --------------   --------------
    Total revenue.....................................................     5,117,000        5,182,000
 
Expenses:
  Property operating, taxes, insurance and ground rent................     1,382,000        1,487,000
  Property general and administrative.................................       320,000          274,000
                                                                        --------------   --------------
    Total property operating expenses.................................     1,702,000        1,761,000
 
Operating Income......................................................    $3,415,000       $3,421,000
                                                                        --------------   --------------
                                                                        --------------   --------------
</TABLE>
 
    Operating  income for the  Same Store Properties for  the three months ended
March 31, 1996 decreased over the same period in the prior year by $6,000.  This
decrease  is attributable  to a decrease  in other income  of $145,000 primarily
relating to a lease buyout of $189,000  during the three months ended March  31,
1995.  This decrease was partially  offset by a combined  net increase in rental
revenue, tenant  reimbursements  and parking  income  of $80,000.  In  addition,
operating  expenses including taxes, insurance, ground rent and property general
and administrative expenses for these Same Store Properties decreased by $59,000
for the three months ended March 31, 1996 over the same period in the prior year
due to the  economies of  scale that  the Company  achieved by  owning a  larger
portfolio  of properties and the reassessment of property taxes. The Company was
able to obtain certain discounts by utilizing its greater purchasing power.
 
    COMPARISON OF  YEAR ENDED  DECEMBER  31, 1995  TO  YEAR ENDED  DECEMBER  31,
1994.   During 1995, the Arden  Predecessors purchased nine Properties resulting
in an  increase  in  real  estate investments  of  approximately  $146  million.
Operating  income increased by $8.9 million for the year ended December 31, 1995
compared to the  year ended December  31, 1994. This  96% increase is  due to  a
$14.7  million or 105% increase in total revenue for the year ended December 31,
1995 compared to the year ended December 31, 1994. The increase in total revenue
was offset in part by  an increase in total  property operating and general  and
administrative  expenses of $5.7 million or 126% for the year ended December 31,
1995 compared to the year ended December 31, 1994.
 
    Rental revenue  increased  by $12.5  million  or  105% for  the  year  ended
December  31, 1995 compared to the year ended December 31, 1994. The increase in
rental revenue resulted  principally from  a full  year of  rental revenue  from
Properties  acquired in  1994 and  partial year  rental revenue  from Properties
acquired in 1995. Rental revenue from the 1994 acquisition Properties  increased
to  $8.8 million for the year ended  December 31, 1995, representing a full year
of rental revenue,  from $2.0  million for such  Properties in  the prior  year.
Rental  revenue  associated  with  the  1995  acquisition  Properties  added  an
additional approximately $5.4 million to rental revenue in 1995. Rental  revenue
also increased as a result of contractual base
 
                                       47
<PAGE>
rent  increases on leases in effect during  both years and due to improvement in
occupancy ratios at  certain properties.  Occupancy rose from  82% to  88% on  a
portfolio wide basis for properties owned at both December 31, 1994 and 1995.
 
    Tenant reimbursements and other revenue increased by $1.2 million or 99% for
the  year ended December 31, 1995 compared  to the year ended December 31, 1994.
Other revenue increased by $919,000, primarily representing management fees from
third party-owned properties.  The increase in  tenant reimbursements and  other
revenue  resulted principally  from a  full year  of tenant  reimbursements from
Properties acquired  during 1994  and partial  year tenant  reimbursements  from
Properties  acquired during  the year  ended December  31, 1995  as well  as the
addition of  one new  third  party property  management agreement  during  1995.
Tenant  reimbursements  from  the  calendar  year  1994  acquisition  Properties
increased to $395,000 for the year ended December 31, 1995, representing a  full
year  of  tenant  reimbursements,  from  $190,000  in  the  prior  year.  Tenant
reimbursements  associated  with  the  1995  acquisition  Properties  added   an
additional approximately $160,000 to tenant reimbursements during the year ended
December 31, 1995.
 
    Parking  revenue increased by  $924,000 or 125% for  the year ended December
31, 1995 compared  to the year  ended December 31,  1994. The increase  resulted
principally  from a full year of parking revenue from Properties acquired during
calendar year 1994  and partial  year parking revenue  from Properties  acquired
during  the year ended December 31, 1995. Parking revenue from the calendar year
1994 acquisition Properties increased  to $115,000 for  the year ended  December
31,  1995, representing a full  year of such revenue,  from $20,000 in the prior
year. Parking revenue associated with the 1995 acquisition properties, added  an
additional $584,000 to parking revenue during the year ended December 31, 1995.
 
    Total  property  operating expenses  were $10.3  million,  or 41%  of rental
revenue and tenant reimbursements,  and $4.5 million, or  37% of rental  revenue
and  tenant reimbursements, for  the years ended December  31, 1995 and December
31, 1994, respectively.  The increase  in total property  operating expenses  is
primarily  attributable to a full year  of total property operating expenses for
the 1994 acquisition Properties,  the partial year  of total property  operating
expenses  for the 1995  Acquisition Properties and  the expenses associated with
the absorption of vacant  rentable space across the  portfolio. The increase  in
total  property operating  expenses from  1994 to  1995 resulting  from the 1995
acquisitions  was  approximately  $2.6  million.  In  addition,  total  property
operating  expenses increased  by $3.2 million  for the year  ended December 31,
1995 as a result  of a full  year of operations for  the Properties acquired  in
1994,  and the above-described increase in  occupancy at the Properties owned at
both December 31, 1994  and 1995. Total property  operating expenses related  to
Properties  owned  by  the  Company  for all  of  both  1994  and  1995 remained
substantially unchanged  due to  the  efficiency of  owning and  operating  more
Properties and sharing resources.
 
    General  and administrative expenses  increased by $688,000  or 100% for the
year ended  December 31,  1995 compared  to  the year  ended December  31,  1994
primarily due to additional employees required to manage the increased portfolio
of  Properties. General  and administrative  expenses as  a percentage  of total
revenue remained flat  at 5%  during 1995 and  1994. The  Company believes  that
because  it will not  need to hire  significant new staff  to manage its current
portfolio and to acquire new properties, general and administrative expenses  as
a percentage of total revenue should begin to fall in subsequent years.
 
    Interest  expense includes interest at the  contractual rate of the mortgage
loans, amortization of the loan fees  paid at origination, and accrual of  other
interest  payable upon the retirement of the debt. Interest expense for the year
ended December  31, 1995  was approximately  $13.8 million,  including  interest
payable  upon the retirement of certain mortgage loans of $1.1 million. Interest
expense increased by $8.7 million, or 170% for the year ended December 31,  1995
compared  to  the year  ended December  31, 1994  primarily as  a result  of the
increase in mortgage loans incurred to fund the 1995 acquisitions. The  interest
expense  associated with the 1995 mortgage  loans was $4.5 million. In addition,
1995 included  a full  year of  interest expense  for debt  incurred to  acquire
Properties  in  1994, which  increased  interest expense  by  approximately $2.9
million.
 
    Depreciation and amortization  increased by $2.2  million or 100%  primarily
due to the 1995 acquisitions and the full year effect of the 1994 acquisitions.
 
                                       48
<PAGE>
    As a result of the foregoing, the Company had a net loss of $1.2 million for
the  year ended  December 31, 1995  compared to  net income of  $784,000 for the
prior year.
 
    The following  is a  comparison of  the operating  data for  the Same  Store
Properties  that were  owned for  the entire  year ended  December 31,  1994 and
December 31, 1995:
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31,   DECEMBER 31,
                                                                            1995           1994
                                                                        ------------   ------------
<S>                                                                     <C>            <C>
Revenue:
  Rental..............................................................  $ 10,179,000    $9,966,000
  Tenant reimbursements...............................................       267,000       319,000
  Parking.............................................................       965,000       721,000
  Other...............................................................       373,000       418,000
                                                                        ------------   ------------
    Total revenue.....................................................    11,784,000    11,424,000
Expenses:
  Property operating, taxes, insurance and ground rent................     3,312,000     3,324,000
  Property general and administrative.................................       586,000       627,000
                                                                        ------------   ------------
    Total property operating expenses.................................     3,898,000     3,951,000
Operating Income......................................................  $  7,886,000    $7,473,000
                                                                        ------------   ------------
                                                                        ------------   ------------
</TABLE>
 
    Operating income for the Same Store  Properties for the year ended  December
31,   1995  increased  over  the  prior  year  by  $413,000.  This  increase  is
attributable to an increase in occupancy from 84% at December 31, 1994 to 92% at
December 31,  1995  and  an  overall  increase  in  contractual  base  rent  and
amortization   of  free  rent  periods.   Operating  expenses  including  taxes,
insurance, ground  rent and  property general  and administrative  expenses  for
these Same Store Properties decreased by $53,000 for the year ended December 31,
1995 over the prior year due to the economies of scale that the Company obtained
by owning a larger portfolio of Properties. The Company was able to allocate its
personnel among more of its Properties and obtain certain discounts by utilizing
its greater purchasing power.
 
    COMPARISON OF YEAR ENDED DECEMBER 31, 1994 TO YEAR ENDED 1993.  During 1994,
the  Arden Predecessors  purchased five Properties  resulting in  an increase in
investments in  Properties  of  approximately $43.2  million.  Operating  income
increased  by $7.1 million for the year  ended December 31, 1994 compared to the
year ended December 31,  1993. This 311%  increase is due  primarily to a  $10.1
million  or 267% increase in total revenue  for the year ended December 31, 1994
compared to the year ended December 31, 1993. The increase in total revenue  was
offset  by a $3.0 million or 201%  increase in total property operating expenses
for the year ended  December 31, 1994  compared to the  year ended December  31,
1993.
 
    Rental  revenue increased by  $8.8 million 278% for  the year ended December
31, 1994 compared to the  year ended December 31,  1993. The increase in  rental
revenue  resulted principally from a full year of rental revenue from Properties
acquired in 1993  and partial year  rental revenue from  Properties acquired  in
1994.  Rental revenue  from the 1993  acquisition Properties  increased to $10.0
million for the year ended December 31, 1994, representing a full year of rental
revenue from  those Properties,  from $3.2  million in  the prior  year.  Rental
revenue associated with the 1994 acquisition Properties added an additional $2.0
million  to rental revenue in 1994. Occupancy decreased from 84% at December 31,
1993 to 82% at December  31, 1994 on a portfolio-wide  basis as a result of  the
acquisition of the 1994 Acquisition Properties.
 
    Tenant  reimbursements and other  revenue increased by  $892,000 or 254% for
the year ended December 31, 1994 compared  to the year ended December 31,  1993.
Tenant  reimbursement increases represented $471,000 of this increase, and other
revenue,  primarily  representing   management  fees   from  third   party-owned
properties,  represented  $421,000  of  this increase.  The  increase  in tenant
reimbursements resulted principally  from a full  year of tenant  reimbursements
from Properties acquired during 1993 and partial year tenant reimbursements from
Properties  acquired during 1994.  Tenant reimbursements from  the calendar year
1993 acquisition Properties increased  to $319,000 for  the year ended  December
31,  1994, representing a full  year of such revenue,  from $38,000 in the prior
year. Tenant reimbursements associated with the 1994
 
                                       49
<PAGE>
acquisition Properties  added  an  additional  approximately  $190,000  to  such
revenue during 1994. The increase in property management fees resulted primarily
from  a full  year of  property management  fees in  1994 for  third party-owned
properties managed for part of the year in the prior period.
 
    Parking revenue increased by  $457,000 or 161% for  the year ended  December
31,  1994 compared to  the year ended  December 31, 1993.  The increase resulted
primarily from a full  year of parking revenue  from Properties acquired  during
calendar  year 1993  and partial year  parking revenue  from Properties acquired
during the year ended December 31, 1994. Parking revenue from the calendar  year
1993  acquisition Properties increased  to $721,000 for  the year ended December
31, 1994, representing a full year of  such revenue, from $284,000 in the  prior
year.  Parking revenue associated with the  1994 acquisition Properties added an
additional $20,000 to parking revenue during the year ended December 31, 1994.
 
    Total property  operating  expenses were  $4.5  million, or  37%  of  rental
revenue  and tenant reimbursements,  and $1.5 million, or  47% of rental revenue
and tenant  reimbursements, for  the years  ended December  31, 1994  and  1993,
respectively.  The increase  in total  property operating  expenses is primarily
attributable to the addition of the 1994 acquisition Properties and the expenses
associated with the absorption  of vacant rentable  space across the  portfolio.
The  increase in total  property operating expenses from  1993 to 1994 resulting
from the  1994  acquisitions  was approximately  $593,000.  In  addition,  total
property operating expenses increased by $2.4 million as a result of a full year
of  operations for  the Properties  acquired in 1993,  and the  increases in the
occupancy at such Properties.
 
    General and  administrative  expenses  increased $303,000  or  79%  in  1994
compared to 1993 primarily due to an increase in payroll of $210,000 required by
the  Company  to  manage  its increased  portfolio.  General  and administrative
expenses as a percentage of  total revenue decreased to 5%  in 1994 from 10%  in
1993  as the Company was  able to spread its  personnel and other overhead costs
over more Properties.
 
    Interest expense in  1994 increased by  $4.4 million, or  659%, compared  to
1993. The increase was primarily due to a full year of interest on debt incurred
in 1993, as well as the interest due on a $31 million loan used to fund the 1994
acquisitions. The interest expense associated with the 1994 property acquisition
debt was approximately $985,000. Interest expense increased by $3.4 million as a
result  of  a  full  year  of interest  expense  for  debt  incurred  to acquire
Properties in 1993.
 
    Depreciation and amortization  increased by $1.7  million or 314%  primarily
due to the 1994 acquisitions and the full year effect of the 1993 acquisitions.
 
    As  a result of the Northridge earthquake, the Company had some minor damage
to three of its buildings, resulting in an extraordinary loss of $601,000 in the
year ended December 31, 1994.
 
    As a result of the foregoing, the Company had net income of $784,000 for the
year ended December 31, 1994  compared to net income  of $691,000 for the  prior
year.
 
PRO FORMA OPERATING RESULTS
 
    THREE  MONTHS ENDED  MARCH 31,  1996.   On a  pro forma  basis, combined net
income (before deduction of the minority interest) would have been $7.0  million
for  the three months ended March 31,  1996, or $6.2 million combined net income
of the Company (after deduction of the minority interest), comparing  positively
to  the historical net loss of $1.8 million for the three months ended March 31,
1996. This positive comparison results from a significant reduction in  interest
expense  based on the effects of the  proposed Offering as well as a substantial
increase in total revenue, due to the  benefit of a pro forma full three  months
of revenue from the Properties acquired (and to be acquired) in 1996.
 
    Pro  forma  total  revenue  is $19.6  million  representing  a  $4.5 million
increase over  historical 1996,  resulting primarily  from an  increase of  $3.7
million  in  rental  revenue  associated with  Properties  acquired  (and  to be
acquired) in 1996. Pro forma revenue  from tenant reimbursements and parking  is
$2.5 million, representing a $430,000 increase over historical results.
 
    The historical 1996 interest expense of $8.8 million decreased substantially
to  $2.1 million on  a pro forma  basis. Correspondingly, interest  expense as a
percentage of total revenue dropped substantially, from
 
                                       50
<PAGE>
59% of total revenue in historical 1996 to 10.8% of total revenue on a pro forma
basis. Total property  operating expenses  increased to  $6.3 million  on a  pro
forma basis compared to $5.3 million for historical 1996.
 
    YEAR  ENDED DECEMBER 31,  1995.  On  a pro forma  basis, combined net income
(before deduction of the  minority interest) would have  been $25.7 million  for
the  year ended December 31,  1995, or $22.4 million  combined net income of the
Company (after deduction of the minority interest), comparing positively to  the
historical  net loss of $1.2 million for  the year ended December 31, 1995. This
positive comparison results from a significant reduction in interest expense  as
well  as a substantial  increase in total revenue,  due to the  benefit of a pro
forma full year of revenue from the  Properties acquired in 1995, and pro  forma
revenue from the 1996 acquisitions.
 
    Pro  forma  total  revenue is  $78.0  million representing  a  $49.5 million
increase over historical  1995, resulting  primarily from an  increase of  $23.7
million  in  rental  revenue  associated with  Properties  acquired  (and  to be
acquired) in  1996,  combined  with a  full  year  of rental  revenue  from  the
Properties  acquired  in  1995  totaling  $21.8  million.  Revenue  from  tenant
reimbursements and parking also increased on  a pro forma basis over  historical
1995  primarily due to $3.0 million of  such revenue generated at the Properties
acquired or to  be acquired  in 1996. The  historical 1995  interest expense  of
$13.8  million decreased to $8.4 million on  a pro forma basis. Interest expense
as a percentage of revenue dropped  substantially, from 48% of total revenue  in
1995  to 10.8% of total  revenue on a pro  forma basis. Total property operating
expenses remained steady at 42% of rental revenue both on a pro forma basis  and
for historical 1995.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The  Company  believes  the  Offering and  the  Formation  Transactions will
improve its  financial performance  through changes  to its  capital  structure,
principally the substantial reduction in its overall debt and its debt to equity
ratio.  Through the  Formation Transactions, the  Company will repay  all of its
existing mortgage  debt and  replace it  with  secured fixed  rate debt  in  the
principal  amount of $104 million. Thus,  total secured debt after the Formation
Transactions (assuming no advances under the Credit Facility) will be reduced by
approximately $270.0 million  in principal.  This will result  in a  significant
reduction  of annual mortgage interest expense  as a percentage of total revenue
(10.8% on a pro  forma basis as  compared to 48% for  the historical year  ended
December  31,  1995).  Thus,  cash from  operations  required  to  fund interest
expenses will decrease substantially, although such reduction will be offset  by
the  use of cash from operations  to meet annual REIT distribution requirements.
In addition, the Offering and Formation Transactions, together with the Mortgage
Financing and  the  Credit Facility,  will  produce a  lower  leveraged  capital
structure. The market capitalization of the Company, based on the initial public
offering price of the issued and outstanding shares of Common Stock and OP Units
(assuming  all OP Units are  exchanged for shares of  Common Stock) and the debt
outstanding at the completion  of the Offering is  expected to be  approximately
$532.5  million  with  total debt  (exclusive  of accounts  payable  and accrued
expenses) of approximately  $104 million.  As a  result, the  Company's debt  to
total  market capitalization  ratio will  be approximately  19.5% (17.8%  if the
Underwriters' overallotment option  is exercised in  full). The Credit  Facility
combined  with this lower leveraged capital structure will enhance the Company's
ability to take advantage  of acquisition opportunities as  well as provide,  if
necessary, working capital for funding commitments to construct tenant leasehold
improvements  and  payment of  leasing commissions  associated with  new leasing
activity.
 
    After the Offering, the Company  expects to have approximately $200  million
available  under the  Credit Facility. The  Company anticipates  that the Credit
Facility will be used primarily to acquire additional properties and for general
working capital needs.
 
    The Company's mortgage  indebtedness expected  to be  outstanding after  the
closing  of the Offering will require a balloon payment in 2003 of $104 million.
Since the  Company  anticipates that  none  of  the principal  of  its  mortgage
indebtedness  will be amortized prior to maturity  and the Company will not have
sufficient funds on  hand to  repay such indebtedness  at maturity,  it will  be
necessary  for the Company to refinance such debt either through additional debt
financings  secured  by  individual  properties  or  groups  of  properties,  by
unsecured  private or public debt offerings  or additional equity offerings. See
"Risk Factors -- Real Estate Financing Risks."
 
                                       51
<PAGE>
    The  Company  expects  to  make   distributions  from  Cash  Available   for
Distributions,  which  the  Company  believes  will  exceed  Cash  Available for
Distributions historically  available  as a  result  of the  reduction  in  debt
service  expected to result from the  repayment of indebtedness described above.
Amounts accumulated for distribution will  be invested by the Company  primarily
in  short-term investments that  are collateralized by  securities of the United
States government or any of its  agencies, high-grade commercial paper and  bank
deposits. See "Distributions."
 
    The  Company expects to meet its short-term liquidity requirements generally
through its initial  working capital and  net cash provided  by operations.  The
Company  believes that its net cash provided by operations will be sufficient to
allow the Company to make any  distributions necessary to enable the Company  to
continue  to qualify  as a  REIT. The Company  also believes  that the foregoing
sources of liquidity will be sufficient  to fund its short-term liquidity  needs
for the foreseeable future.
 
    The Company expects to meet certain long-term liquidity requirements such as
property  acquisitions, scheduled  debt maturities,  renovations, expansions and
other non-recurring capital improvements through long-term secured and unsecured
indebtedness and the issuance of additional equity securities. The Company  also
expects  to use funds available under  the Credit Facility to fund acquisitions,
development activities and capital improvements on an interim basis.
 
CASH FLOWS
 
    COMPARISON FOR THE  THREE MONTHS ENDED  MARCH 31, 1996  TO THE THREE  MONTHS
ENDED MARCH 31, 1995. The increase in cash and cash equivalents of $890,000 from
March  31, 1995  to March  31, 1996  is due  to the  excess of  cash provided by
financing activities  over  cash  used in  operating  activities  and  investing
activities.  Net cash provided by operating activities increased by $1.3 million
from $109,000 to  $1.4 million primarily  due to an  increase in rental  revenue
offset  by  higher  mortgage interest.  Net  cash used  in  investing activities
increased by $75.8 million from $20.1 million to $95.9 million mainly due to  an
increase  in the amount of real estate  assets purchased during 1996 compared to
1995. Net cash provided by financing activities increased by $74.7 million  from
$19.3  million to $94.0  million due primarily to  proceeds received on mortgage
loans.
 
    COMPARISON FOR THE YEAR ENDED DECEMBER  31, 1995 TO THE YEAR ENDED  DECEMBER
31,  1994.  The increase in cash  and cash equivalents of $740,000 from December
31, 1994 to December 31, 1995 is due to the excess of cash provided by operating
and financing  activities  over cash  used  in investing  activities.  Net  cash
provided  by operating activities increased by $3.0 million from $1.2 million to
$4.2 million primarily due to the additional cash flow generated by the increase
in the  number  of Properties  owned.  Net  cash used  in  investing  activities
increased  by $104.2 million from $45.8 million  to $150.0 million mainly due to
an increase in the amount of  real estate assets purchased during 1995  compared
to  1994. Net cash provided by  financing activities increased by $102.7 million
from $43.9 million to $146.5 million due to proceeds received on mortgage  notes
offset in part by increases in mortgage loans repaid and restricted cash.
 
    COMPARISON  FOR THE YEAR ENDED DECEMBER 31,  1994 TO THE YEAR ENDED DECEMBER
31, 1993.  The decrease in cash  and cash equivalents of $754,000 from  December
31, 1993 to December 31, 1994 is due to distributions from one Arden Predecessor
to its owners of $1.5 million and the acquisition of improvements and Properties
in  excess of  financing activities. These  uses were partially  offset by owner
contributions. Net cash provided by  operating activities decreased by  $485,000
from  $1.7 million  to $1.2 million  primarily due  to an increase  in rents and
other receivables,  deferred  rents  prepaid financing  and  leasing  costs  and
prepaid  expenses and  other assets  offset by  an increase  in depreciation and
amortization and net income. Net cash used in investing activities decreased  by
$17.1  million from $62.9 million  to $45.8 million mainly  due to a decrease in
the value of real estate assets purchased during 1994 compared to 1993. Net cash
provided by financing activities decreased  by $19.1 million from $63.0  million
to  $43.9 million due to a decrease  in the amount proceeds received on mortgage
notes incurred to finance real estate acquisitions offset in part by an increase
in owners' contributions.
 
                                       52
<PAGE>
INFLATION
 
    Substantially all of the office  leases provide for separate escalations  of
real  estate taxes and operating expenses over  a base amount. In addition, many
of  the  office  leases  provide  for  fixed  base  rent  increases  or  indexed
escalations  (based on  the CPI  or other  measures). The  Company believes that
inflationary increases in expenses will be offset by the expense  reimbursements
and contractual rent increases described above.
 
    The  Credit Facility will  bear interest at  a variable rate,  which will be
influenced by changes  in short-term interest  rates, and will  be sensitive  to
inflation.
 
                 SOUTHERN CALIFORNIA ECONOMY AND OFFICE MARKETS
 
    The  Company believes  that current  and forecast  trends affecting Southern
California have  created  and  will  continue to  create  a  favorable  economic
environment   in  the   suburban  Southern   California  office   markets  where
substantially all of the  Company's Properties are  located. First, the  Company
believes  that the  supply of  Class A office  space in  Southern California has
stabilized and is unlikely to increase over the short term in large part because
it is not economically  feasible to develop  new Class A  office space based  on
rental   rates  currently  attainable  in  Southern  California  office  markets
according to C&W. Second, the recent economic restructuring of many of  Southern
California's   primary   office-using  sectors   including   the  entertainment,
export/import, managed  health care,  high technology,  telecommunications,  and
civilian  and military  aerospace and  defense industries  has caused  growth in
demand for office space. Third, demand for Class A office space relative to  the
level  of supply has  led to higher  occupancy rates and  a trend towards higher
rental rates which  are supportable in  the office markets  where the  Company's
Properties  are located. Finally, patterns of residential relocation to suburban
areas due in part to the public  perception of greater personal security and  to
the  availability of greater recreational  and residential amenities in suburban
areas, coupled with  a heightened preference  for living in  close proximity  to
work  and employers'  resultant access  to a  broader, more  skilled local labor
force have  fueled  growth  of  suburban office  property  demand.  The  Company
believes  that these  factors and  other specific  economic indicators discussed
below suggest a general strengthening of the Southern California economy.  Given
the  quality  and  location  of  its  Properties,  the  Company  believes  it is
competitively  positioned  to  capitalize  on  these  economic  trends  and  the
resulting  demand for  suburban Class A  office space. In  addition, the Company
believes that the suburban Los Angeles County submarkets in which its Properties
are located will  outperform the Downtown/CBD,  which has not  begun to  recover
from the real estate downturn.
 
SOUTHERN CALIFORNIA ECONOMY
 
    OVERVIEW.    The  Company  believes  that  the  office  markets  in Southern
California, and particularly suburban Los Angeles County, have improved and will
be excellent markets in which to own and operate office properties over the long
term.
 
    The three-county  region  in  which the  Company's  Properties  are  located
includes  Los Angeles, Orange and San Diego counties which collectively comprise
approximately 45% of the statewide population and employment base in California.
Data from the U.S.  Bureau of Labor Statistics  indicates that the  unemployment
rate  in these  counties peaked in  1993 during the  height of the  1990 to 1993
recessionary period in  Southern California. Recently,  however, these  counties
experienced  a gradual  economic recovery  marked by  falling unemployment rates
beginning in 1994 which, according to the 1995 ECONOMIC REPORT, was precipitated
by growth in the services and trade employment sectors, among others, and a less
pronounced rate of decline in defense related activities in Southern California.
For instance, the unemployment rate for the Los Angeles PMSA has been  declining
since  1993 and dropped below 8% in 1995  for the first time since 1990. Similar
trends of decreasing unemployment rates were also experienced in Orange and  San
Diego  counties. The graph below illustrates  unemployment trends for the United
States, California and the three counties in which the Company's Properties  are
located.
 
Line graph entitled Historical Year-End Unemployment Rates depicting the
 
                                       53
<PAGE>
following data points:
 
<TABLE>
<CAPTION>
                              LOS
                            ANGELES      ORANGE     SAN DIEGO
             CALIFORNIA      COUNTY      COUNTY       COUNTY       U.S.
<S>        <C>             <C>         <C>         <C>           <C>
  1991               7.7%        8.2%        5.2%          6.2%       6.7%
  1992               9.3%        9.8%        6.6%          7.3%       7.4%
  1993               9.4%        9.8%        6.7%          7.8%       6.8%
  1994               8.6%        9.4%        5.8%          7.2%       6.1%
  1995               7.8%        7.9%        5.3%          6.5%       5.6%
</TABLE>
 
- --------------
Source: U.S. Bureau of Labor Statistics
 
    The  U.S.  Bureau of  Economic  Analysis has  forecast  a total  increase in
non-farm employment for the period  from 1993 to 2005  of 14.2% for Los  Angeles
County,  35.3% for  Orange County and  30.7% for San  Diego County, representing
average annual growth rates of 1.1%, 2.5% and 2.3%, respectively.
 
    A driving factor in the forecast employment growth within the three counties
in which the Company  operates is a strong  population growth rate, which,  over
the  next five years is expected  to significantly outpace the population growth
rates in both California and the United States as shown below:
 
<TABLE>
<CAPTION>
                                                    POPULATION   POPULATION
                                                      GROWTH       GROWTH
                                                    1990-1996    1996E-2001
AREA                                                ESTIMATED     PROJECTED
- --------------------------------------------------  ----------   -----------
<S>                                                 <C>          <C>
Los Angeles County................................     3.2%         10.0%
Orange County.....................................     7.1%         18.0%
San Diego County..................................     6.4%         20.6%
California........................................     6.8%          4.4%
United States.....................................     6.7%          4.4%
</TABLE>
 
- --------------
Source: Urban Decisions Systems, Inc.
 
    As primary office employment grows,  office demand is expected to  increase.
According  to AMERICA'S OFFICE ECONOMY prepared  by Cognetics, Inc., Los Angeles
County, in which 21 of  the Company's 24 Properties  are located, is the  number
one  market in the United  States for primary office  employment growth, and San
Diego is ranked 18th.
 
                       TOP 20 MARKETS FOR PRIMARY OFFICE
                         EMPLOYMENT GROWTH (1995-2005)
 
<TABLE>
<C>    <S>
  1.   LOS ANGELES
  2.   Atlanta
  3.   San Francisco-Oakland-San Jose
  4.   Washington, DC-MD-VA
  5.   Dallas-Ft. Worth
  6.   Chicago
  7.   Phoenix
  8.   New York
  9.   Houston-Galveston
 10.   Tampa-St. Petersburg
 11.   Minneapolis-St. Paul
 12.   Denver-Boulder
 13.   Boston
 14.   Orlando
 15.   Seattle
 16.   Philadelphia
 17.   Miami-Ft. Lauderdale
 18.   SAN DIEGO
 19.   Detroit
 20.   Kansas City
</TABLE>
 
- --------------
Source: Cognetics, Inc.
 
    A significant factor for  primary office employment  growth in Los  Angeles,
Orange  and San Diego counties is a trend within these local economies to become
more services-oriented. Data from the U.S. Bureau of Labor Statistics  indicates
a trend over the past six years of growth in the services and government sectors
(both  large office space  users), and a decline  in the manufacturing, finance,
insurance and real estate  (FIRE) and trade sectors,  with the other  employment
sectors  remaining stable in proportion to total non-farm employment. Employment
in the service sector in the Los Angeles PMSA increased to 33% of total non-farm
employment in 1995 from  29% in 1990.  Both Orange County  and San Diego  County
experienced a similar trend in the employment shift towards services.
 
                                       54
<PAGE>
    In  addition to becoming a more diversified economy with a stronger emphasis
on the services and  government sectors, according to  the Los Angeles EDC,  Los
Angeles  County  ranks  number one  in  the  nation in  the  number  of business
establishments by county and is a major center of international trade. According
to the 1995  ECONOMIC REPORT, Los  Angeles County is  also the nation's  leading
manufacturing  center.  Los  Angeles  County  comprises  40%  of  the nondurable
manufacturing employment, 95% of  the motion picture employment  and 56% of  the
aerospace  employment in California. The Los Angeles PMSA is the largest PMSA in
the United States (larger than both the New York City PMSA and the Chicago PMSA)
and accounts for  approximately 28%  of California's  population and  employment
base. Demand for office space in Los Angeles County is expected to remain strong
as a result of these characteristics.
 
    International  trade is another  major component of  the Los Angeles economy
and while growth in  international trade is difficult  to attribute to  specific
employment  sectors, it  is an  indicator of the  general strength  of the local
economy. In 1994 the Los Angeles Customs District (which is primarily  comprised
of  the Los  Angeles/Long Beach port  complex and the  Los Angeles International
Airport) surpassed New York/ New Jersey as the nation's leading port.  According
to  the California Department of Finance,  from 1987 to 1995 international trade
passing  through  the   Los  Angeles   Customs  District   has  increased   from
approximately $77.6 billion in 1987 to approximately $164.2 billion in 1995.
 
SOUTHERN CALIFORNIA OFFICE MARKETS
 
    OVERVIEW.   The Company believes that the  Los Angeles, Orange and San Diego
County office markets are attractive markets in which to own and operate  office
properties.  Specifically, the Los Angeles County market,  in which 21 of the 24
Properties are  located,  has  the following  favorable  market  characteristics
according   to  C&W:  (i)  the  Los  Angeles  County  suburban  submarkets  have
experienced three years of positive net  absorption and five years of  declining
direct  vacancy rates; (ii) there has been  virtually no new additions to supply
to the  Los Angeles  County suburban  office market  since 1992;  and (iii)  new
speculative  office  development  is  unlikely at  the  current  time, primarily
because new  construction  is not  economically  feasible given  current  market
rental   rates  and  also   because  of  governmental   constraints  and  zoning
restrictions in certain markets.
 
    INCREASING DEMAND FOR OFFICE SPACE.  In the past three years the  underlying
fundamentals  of supply  and demand in  the suburban Los  Angeles County, Orange
County and  downtown  San  Diego  office markets  have  improved.  The  peak  in
available  supply occurred near the midpoint  of the recession. Since that time,
the local economies have been recovering and the relationship between supply and
demand  has  resulted  in  declining  direct  vacancy  rates  and  positive  net
absorption  in these  markets. According  to C&W, as  of December  31, 1995, the
direct vacancy  rate for  the suburban  Los Angeles  County office  market,  the
Orange  County office market and the downtown San Diego office market was 17.0%,
15.5% and  17.9%, respectively,  as compared  to 19.2%,  19.5% and  19.4% as  of
December 31, 1991, respectively.
 
Line graph entitled Historical Year-End Direct Vacancy Rates depicting the
following data points:
 
<TABLE>
<CAPTION>
                      LOS ANGELES
                        COUNTY                      DOWNTOWN
             U.S.     (SUBURBAN)   ORANGE COUNTY   SAN DIEGO
<S>        <C>        <C>          <C>             <C>
  1991       17.5%       19.2%         19.5%         19.4%
  1992       18.2%       18.9%         19.1%         20.7%
  1993       17.2%       18.4%         17.1%         19.4%
  1994       15.3%       17.3%         17.2%         19.8%
  1995       14.0%       17.0%         15.5%         17.9%
</TABLE>
 
- --------------
Source: Cushman & Wakefield
Note: U.S. vacancy is the weighted average of 44 markets.
 
Bar graph entitled Historical Annual Net Absorption depicting the following data
 
                                       55
<PAGE>
points:
 
<TABLE>
<CAPTION>
                                    1993        1994        1995
<S>                              <C>         <C>         <C>
DOWNTOWN SAN DIEGO                  201,334     (45,192)    273,777
ORANGE COUNTY                     1,003,756     188,000     295,057
LOS ANGELES COUNTY                   55,268     234,566     983,906
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
    PROJECTED  DECLINING DIRECT VACANCY RATES.  C&W has projected that aggregate
direct vacancy rates  in the  suburban Los  Angeles County  office market  would
decline to 14.4% as of December 31, 1998 assuming (i) no additions to the supply
of  office space inventory that existed in such office markets as of December 3,
1995 and  (ii)  annual  positive  net absorption  of  direct  availabilities  of
1,000,000  square feet. C&W's projection of such absorption and declining direct
vacancy rates was based on recent historical positive net absorption experienced
in the suburban Los Angeles County office market. No assurance can be made  that
such  absorption of direct availabilities  will occur in the  future or that the
current supply of office space inventory  will not increase, and therefore  that
direct vacancy rates will decline as outlined in the graph below.
 
Line graph entitled Historical Year-End Direct Vacancy Rates depicting the
following data points:
 
<TABLE>
<CAPTION>
                      LOS ANGELES
                        COUNTY                      DOWNTOWN
             U.S.     (SUBURBAN)   ORANGE COUNTY   SAN DIEGO
<S>        <C>        <C>          <C>             <C>
  1991       17.5%       19.2%         19.5%         19.4%
  1992       18.2%       18.9%         19.1%         20.7%
  1993       17.2%       18.4%         17.1%         19.4%
  1994       15.3%       17.3%         17.2%         19.8%
  1995       14.0%       17.0%         15.5%         17.9%
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
    NO  NEW SUPPLY OF OFFICE SPACE.   According to C&W, there has been virtually
no new office development  in Los Angeles County  and Orange County since  1992.
Similarly,  there has been no new office development in downtown San Diego since
1991. In the opinion of C&W, the addition of any new speculative office space to
these markets is unlikely at the current time, primarily because speculative new
construction is not economically feasible given current market rental rates  and
also  because  of governmental  constraints and  zoning restrictions  in certain
markets.
 
    POTENTIAL REVENUE INCREASE AT REPLACEMENT COSTS RENTS.  The Company believes
that all of its  Properties have been purchased  at a substantial discount  from
replacement  cost and have the potential for significant internal revenue growth
as rental rates for office properties in their respective submarkets recover  to
levels  ("Replacement Cost  Rents") that  would provide  a reasonable  return on
investment to  a  developer of  a  new  Class A  multi-tenant  office  building.
According  to C&W, market rental rates in Los Angeles County are currently below
the levels  required  to  justify  new Class  A  office  development.  Based  on
estimates  provided  by  C&W, Replacement  Cost  Rents required  to  justify new
construction would be equal to approximately  $35 per square foot for  excellent
quality  Class A office  buildings and $24  per square foot  for average quality
Class A office  buildings. By  comparison, the current  weighted average  annual
base  rental rate (full  service gross leases only,  excluding leases subject to
triple net lease provisions) received by  the Company in each of its  Properties
which  ranges from $15.24 per square foot to $31.00 per square foot with a total
weighted average  annual base  rental rate  of $19.96  per square  foot and  the
weighted  average annual asking rents for competitive office properties in their
respective submarkets are  substantially below Replacement  Cost Rents. This  is
confirmed  by the fact  that according to  C&W there has  been extremely limited
office development (375,000 square feet out  of a total 81,741,409 square  feet)
and  no speculative office  development in the Los  Angeles submarkets where the
Company operates Properties in the past four years.
 
                                       56
<PAGE>
    The costs  and implied  Replacement Cost  Rents outlined  above exclude  any
value  attributable to underlying land, which, if purchased in connection with a
new development would imply that higher Replacement Cost Rents would be required
to  justify  the  increased  costs  of  development  resulting  from  the   land
acquisition  costs. There can be no assurance as  to when, if, and the extent to
which the  Properties owned  and  operated by  the  Company will  experience  an
increase in rental rates.
 
                                       57
<PAGE>
                            BUSINESS AND PROPERTIES
 
GENERAL
 
    Upon  completion of the Offering, the  Company will own 24 office properties
containing approximately  4.0  million  rentable  square  feet.  The  Properties
consist  primarily of Class A suburban  office properties and individually range
from approximately 49,000 to 548,000 rentable square feet. All of the Properties
are located in  Southern California,  with 21  located in  suburban Los  Angeles
County,  two in Orange County, and one in San Diego County. The Company believes
that  the  Properties  have  desirable  locations  within  established  business
communities  and  are  well-maintained.  Of  the  Company's  24  Properties,  20
Properties have been  built since  1980 and  14 Properties,  including all  four
built  prior to  1980, have been  substantially renovated within  the last three
years. The  average  age  of  the  buildings  is  approximately  12  years.  The
Properties  offer  an array  of various  amenities including  security, parking,
conference facilities,  on-site  management,  food services  and  health  clubs.
Management  believes  that the  location, quality  of construction  and building
amenities, as well  as the Company's  reputation for providing  a high level  of
tenant  service, have enabled the Company to attract and retain a diverse tenant
base. As of April 30, 1996, the Properties had a weighted average occupancy rate
of approximately 88% and were leased  to over 540 tenants. Major tenants,  based
on  square feet leased, include Merrill Lynch, Hewlett Packard Company, Deloitte
&  Touche,  GTE  California,  McDonnell  Douglas,  Pepperdine  University,  Grey
Advertising,  Earth Technology and The Hearst Corporation. As of April 30, 1996,
no one tenant represented more than approximately 3.5% of the aggregate Adjusted
Annualized Base Rent of the Company's portfolio and only 16 tenants individually
represented more than 1% of such Adjusted Annualized Base Rent.
 
    The Properties  are leased  to  a variety  of  local, national  and  foreign
businesses.  Leases  are typically  structured for  terms of  three, five  or 10
years. Most of the Company's leases  are full service, gross leases under  which
tenants  typically pay  for all real  estate taxes and  operating expenses above
those for an  established base year  or expense stop.  Leases typically  contain
provisions  permitting tenants  to renew at  prevailing market  rates. Under the
leases, the  landlord  is generally  responsible  for structural  repairs.  Most
leases  do  not permit  early termination;  however,  certain leases  permit the
tenant to terminate upon six months' notice after the third year of a  five-year
lease  or the fifth year of a  10-year lease, subject to the tenant's obligation
to pay all unamortized tenant improvements and leasing commissions, a penalty of
three to  six months  of additional  rent, and  any rent  concessions  provided,
depending  on the lease terms. Finally,  tenants generally pay directly (without
regard to a base year or expense stop) for overtime use of air conditioning  and
for onsite monthly employee and visitor parking.
 
    Although  the  Company primarily  utilizes  gross leases  (which represented
approximately 84% of  the total  portfolio leased square  feet as  of April  30,
1996),  it also has triple net leases with  a number of tenants. In general, the
triple net leases require the tenants to pay all real property taxes,  insurance
and  expenses of maintaining the  leased space or Property  and have renewal and
termination provisions similar to those described above.
 
PROPERTIES
 
    The following table  sets forth  certain information regarding  each of  the
Properties as of April 30, 1996:
 
                                       58
<PAGE>
<TABLE>
<CAPTION>
                                                                                         PERCENTAGE OF
                                                                                             TOTAL                     ADJUSTED
                                                                          APPROXIMATE      PORTFOLIO                  ANNUALIZED
                                                            YEAR BUILT/     RENTABLE       RENTABLE        PERCENT     BASE RENT
SUBMARKET/PROPERTY                            LOCATION       RENOVATED    SQUARE FEET     SQUARE FEET      LEASED       ($000S)
- ----------------------------------------  ----------------  ------------  ------------  ---------------  -----------  -----------
<S>                                       <C>               <C>           <C>           <C>              <C>          <C>
LOS ANGELES COUNTY
- ----------------------------------------
LOS ANGELES WEST
  BEVERLY HILLS/CENTURY CITY
    9665 Wilshire                         Beverly Hills     1972/92-3         158,345           3.9%           96.3%   $   4,724
    Beverly Atrium                        Beverly Hills     1989               61,314           1.5           100.0        1,392
    Century Park Center                   Los Angeles       1972/94           247,483           6.1            85.9        4,458
  WESTWOOD/WEST LOS ANGELES
    Westwood Terrace                      Los Angeles       1988              135,583           3.4            96.9        3,299
    1950 Sawtelle                         Los Angeles       1988/95           103,620           2.6            76.3        1,598
  MARINA AREA/CULVER CITY/LAX
    400 Corporate Pointe                  Culver City       1987              164,845           4.1            91.5        2,974
    Bristol Plaza                         Culver City       1982               84,014           2.1            78.7        1,191
    Skyview Center                        Los Angeles       1981,87/95(1)     386,294           9.6            80.6        5,255
  PARK MILE/WEST HOLLYWOOD
    The New Wilshire                      Los Angeles       1986              202,544           5.0            84.1        3,487
 
<CAPTION>
LOS ANGELES NORTH
- ----------------------------------------
<S>                                       <C>               <C>           <C>           <C>              <C>          <C>
  SIMI/CONEJO VALLEY
    5601 Lindero Canyon                   Westlake          1989              105,830           2.6           100.0        1,180
    Calabasas Commerce Center             Calabasas         1990              123,121           3.0           100.0        2,111
  WEST SAN FERNANDO VALLEY
    Woodland Hills Financial Center       Woodland Hills    1972/95           221,790           5.5            86.7        4,195
  CENTRAL SAN FERNANDO VALLEY
    16000 Ventura Blvd.                   Encino            1980/96           178,341           4.4            85.8        3,002
  EAST SAN FERNANDO VALLEY/TRI-CITIES
    425 West Broadway                     Glendale          1984               71,489           1.8            89.9        1,250
    303 Glenoaks(2)                       Burbank           1983/96           175,449           4.3            95.7        3,421
    70 South Lake                         Pasadena          1982/94           100,133           2.5            76.6        1,598
<CAPTION>
LOS ANGELES SOUTH
- ----------------------------------------
<S>                                       <C>               <C>           <C>           <C>              <C>          <C>
  LONG BEACH
    4811 Airport Plaza Drive              Long Beach        1987/95           121,610           3.0           100.0        1,051
    4900/10 Airport Plaza Drive           Long Beach        1987/95           150,403           3.7           100.0        1,173
    5000 East Spring                      Long Beach        1989/95           163,358           4.0            87.0        2,833
    100 West Broadway                     Long Beach        1987/96           191,727           4.7            84.4        3,270
  CERRITOS/NORWALK
    12501 East Imperial Highway (2)       Norwalk           1978/94           122,175           3.0            91.9        1,780
<CAPTION>
ORANGE COUNTY
- ----------------------------------------
<S>                                       <C>               <C>           <C>           <C>              <C>          <C>
  WEST COUNTY
    5832 Bolsa Avenue                     Huntington Beach  1985               49,355           1.2           100.0          640
  TRI-FREEWAY AREA
    Anaheim City Centre                   Anaheim           1986/91           175,391           4.3            85.5        2,286
<CAPTION>
SAN DIEGO COUNTY
- ----------------------------------------
<S>                                       <C>               <C>           <C>           <C>              <C>          <C>
  SAN DIEGO MARKET
    Imperial Bank Tower                   San Diego         1982/96           547,578          13.5            82.0        8,065
                                                                          ------------        -----           -----   -----------
    Total/Weighted Average                                                  4,041,792         100.0%           88.0%   $  66,232
 
<CAPTION>
                                           PERCENTAGE OF    AVG. ADJUSTED
                                             PORTFOLIO       ANNUALIZED
                                             ADJUSTED       BASE RENT PER
                                            ANNUALIZED         LEASED          NUMBER
SUBMARKET/PROPERTY                           BASE RENT       SQUARE FOOT      OF LEASES
- ----------------------------------------  ---------------  ---------------  -------------
<S>                                       <C>              <C>              <C>
LOS ANGELES COUNTY
- ----------------------------------------
LOS ANGELES WEST
  BEVERLY HILLS/CENTURY CITY
    9665 Wilshire                                 7.1%        $   31.00              20
    Beverly Atrium                                2.1             22.70              11
    Century Park Center                           6.7             20.98              87
  WESTWOOD/WEST LOS ANGELES
    Westwood Terrace                              5.0             25.11              21
    1950 Sawtelle                                 2.4             20.21              27
  MARINA AREA/CULVER CITY/LAX
    400 Corporate Pointe                          4.5             19.72              15
    Bristol Plaza                                 1.8             18.02              21
    Skyview Center                                7.9             16.87              48
  PARK MILE/WEST HOLLYWOOD
    The New Wilshire                              5.3             20.48              30
LOS ANGELES NORTH
- ----------------------------------------
<S>                                       <C>              <C>              <C>
  SIMI/CONEJO VALLEY
    5601 Lindero Canyon                           1.8             11.15               2
    Calabasas Commerce Center                     3.2             17.14              11
  WEST SAN FERNANDO VALLEY
    Woodland Hills Financial Center               6.3             21.81              56
  CENTRAL SAN FERNANDO VALLEY
    16000 Ventura Blvd.                           4.5             19.63              43
  EAST SAN FERNANDO VALLEY/TRI-CITIES
    425 West Broadway                             1.9             19.45              12
    303 Glenoaks(2)                               5.2             20.38              22
    70 South Lake                                 2.4             20.83              10
LOS ANGELES SOUTH
- ----------------------------------------
<S>                                       <C>              <C>              <C>
  LONG BEACH
    4811 Airport Plaza Drive                      1.6              8.64               1
    4900/10 Airport Plaza Drive                   1.8              7.80               1
    5000 East Spring                              4.3             19.93              26
    100 West Broadway                             4.9             20.21              24
  CERRITOS/NORWALK
    12501 East Imperial Highway (2)               2.7             15.85               3
ORANGE COUNTY
- ----------------------------------------
<S>                                       <C>              <C>              <C>
  WEST COUNTY
    5832 Bolsa Avenue                             1.0             12.96               1
  TRI-FREEWAY AREA
    Anaheim City Centre                           3.5             15.24              13
SAN DIEGO COUNTY
- ----------------------------------------
<S>                                       <C>              <C>              <C>
  SAN DIEGO MARKET
    Imperial Bank Tower                          12.2             17.95              43
                                                -----            ------             ---
    Total/Weighted Average                      100.0%        $   19.96(3)          548
</TABLE>
 
- --------------------
(1)  Skyview  Center consists  of two  Class  A 11-  and 12-story  office towers
    completed in 1981 and 1987, respectively.
(2) Acquisition Property to be acquired concurrently with the Offering.
(3) Weighted average  Adjusted Annualized Base  Rent per leased  square foot  is
    calculated  based only  on rent which  is received from  tenants under gross
    leases, which  represent approximately  84% of  the total  portfolio  leased
    square feet. Excluded from the weighted average calculation are 5601 Lindero
    Canyon,  4811 Airport Plaza  Drive, 4900/10 Airport  Plaza Drive, 5832 Bolsa
    Avenue,  50%  of  space  at  400  Corporate  Pointe  leased  to   Pepperdine
    University,  and 48.3% of  space at Calabasas Commerce  Center leased to two
    tenants, all of which are triple net leased.
 
                                       59
<PAGE>
TENANTS
 
    The Properties are leased to over 540 tenants which are engaged in a variety
of  businesses,  including  financial   services,  entertainment,  health   care
services,  accounting, law,  computer technology, education  and publishing. The
following table sets forth information  regarding the Company's leases with  its
20  largest tenants  based upon  Adjusted Annualized Base  Rent as  of April 30,
1996:
 
TENANT DIVERSIFICATION
 
<TABLE>
<CAPTION>
                                                                                                          PERCENTAGE OF
                                                                                                            AGGREGATE
                                                  WEIGHTED AVG.               PERCENTAGE OF    ADJUSTED     PORTFOLIO
                                          NUMBER    REMAINING     AGGREGATE     AGGREGATE     ANNUALIZED    ADJUSTED
                                            OF    LEASE TERM IN   RENTABLE    LEASED SQUARE   BASE RENT    ANNUALIZED
                                          LEASES    MONTHS(1)    SQUARE FEET      FEET         ($000S)      BASE RENT
                                          ------  -------------  -----------  -------------   ----------  -------------
<S>                                       <C>     <C>            <C>          <C>             <C>         <C>
McDonnell Douglas.......................     2          115         272,013       7.65%       $   2,224       3.49%
GTE California..........................     2           42         113,127       3.18%           1,633       2.56%
Pepperdine University...................     2           80          82,441       2.32%           1,623       2.55%
Logicon, Inc............................     1           75          74,174       2.09%           1,575       2.47%
Merrill Lynch...........................     2           55          47,818       1.34%           1,317       2.07%
Imperial Bank Realty Co.................     2           50          38,855       1.09%           1,275       2.00%
Earth Technology Corporation............     2           86          50,750       1.43%           1,136       1.78%
Latham & Watkins........................     1           95          56,425       1.59%           1,045       1.64%
The Hearst Corporation..................     2           43          29,870       0.84%           1,034       1.62%
Grey Advertising........................     2          115          50,152       1.41%             993       1.56%
DiC Entertainment.......................     1           80          51,708       1.45%             993       1.56%
NME Hospitals...........................     1           43          24,069       0.68%             829       1.30%
Gruntal & Company.......................     1           14          15,321       0.43%             704       1.10%
Intracorp...............................     1           28          54,179       1.52%             691       1.08%
Smith Barney, Inc.......................     2           92          24,736       0.70%             678       1.06%
XIRCOM, Inc.............................     1           15          46,321       1.30%             673       1.05%
Crawford & Company......................     1           23          20,347       0.57%             623       0.98%
Candle Corporation......................     1           78          52,130       1.47%             601       0.94%
JB Oxford Holdings......................     2           65          18,796       0.53%             595       0.93%
Deloitte & Touche.......................     1           57          30,279       0.85%             581       0.91%
    TOTAL/WEIGHTED AVERAGE..............    30           75       1,153,511      32.45%       $  20,823      32.65%
</TABLE>
 
- ------------------
(1) Weighted  average calculation  based on  aggregate rentable  square  footage
    leased by each tenant.
 
    The  following table sets forth information  relating to the distribution of
the Company's leases, based on rentable square feet under lease, as of April 30,
1996:
 
                              LEASE DISTRIBUTIONS
 
<TABLE>
<CAPTION>
                                                                          PERCENT OF
                                                                          AGGREGATE                   PERCENTAGE OF
                                                                          PORTFOLIO      ADJUSTED       AGGREGATE
                                          NUMBER  PERCENT                   LEASED      ANNUALIZED  PORTFOLIO ADJUSTED
SQUARE FEET                                 OF    OF ALL   TOTAL LEASED     SQUARE      BASE RENT       ANNUALIZED
UNDER LEASE                               LEASES  LEASES   SQUARE FEET       FEET        ($000S)        BASE RENT
- ----------------------------------------  ------  -------  ------------  ------------   ----------  ------------------
<S>                                       <C>     <C>      <C>           <C>            <C>         <C>
Less than 2,500.........................   260     47.45 %     344,701         9.70%    $   6,454         9.74%
2,501--5,000............................   115     20.99 %     406,457        11.43%        7,645        11.54%
5,001--7,500............................    49      8.94 %     309,960         8.72%        6,168         9.31%
7,501--10,000...........................    36      6.57 %     312,659         8.79%        6,330         9.56%
10,001--20,000..........................    58     10.58 %     828,102        23.29%       17,530        26.47%
20,001--40,000..........................    16      2.92 %     406,121        11.42%        8,499        12.83%
40,001+.................................    14      2.55 %     947,259        26.64%       13,606        20.54%
    TOTAL...............................   548    100.00 %   3,555,259       100.00%    $  66,232       100.00%
</TABLE>
 
                                       60
<PAGE>
LEASE EXPIRATIONS
 
    The following table sets forth a  schedule of the lease expirations for  the
Properties  for leases in place as of April  30, 1996, assuming that none of the
tenants exercise renewal options or termination  rights, if any, at or prior  to
the scheduled expirations:
 
<TABLE>
<CAPTION>
                                                                       ADJUSTED
    YEAR OF         NUMBER OF     SQUARE FOOTAGE   PERCENTAGE OF    ANNUALIZED BASE    PERCENTAGE OF ADJUSTED
     LEASE           LEASES        OF EXPIRING     TOTAL LEASED    RENT OF EXPIRING    ANNUALIZED BASE RENT OF
  EXPIRATION        EXPIRING          LEASES        SQUARE FEET     LEASES ($000S)         EXPIRING LEASES
- ---------------  ---------------  --------------  ---------------  -----------------  -------------------------
<S>              <C>              <C>             <C>              <C>                <C>
1996                       75          192,501           5.41%         $   4,039                  6.10%
1997                       89          343,222           9.65%             7,909                 11.94%
1998                      104          450,630          12.68%             8,701                 13.14%
1999                       86          449,304          12.64%             8,688                 13.12%
2000                       78          444,577          12.50%             8,939                 13.50%
2001                       37          248,263           6.98%             4,660                  7.04%
2002                       23          537,322          15.11%             9,847                 14.87%
2003                       13          117,785           3.31%             2,406                  3.63%
2004                       12          194,200           5.46%             3,437                  5.19%
2005                       14          429,233          12.07%             4,923                  7.43%
2006                        4           82,296           2.31%             1,727                  2.61%
2008                        2           17,484           0.49%               318                  0.48%
2010                        1            7,404           0.21%               179                  0.27%
2011 and
thereafter                 10           41,038           1.16%               457                  0.69%
    TOTAL                 548        3,555,259         100.00%         $  66,232                100.00%
</TABLE>
 
TENANT RETENTION AND EXPANSIONS
 
    The Company believes that its relationship with tenants contributes in large
part  to  its success  in attracting,  expanding and  retaining its  quality and
diverse  tenant  base.  The  Company  strives  to  develop  and  maintain   good
relationships  with tenants  through its  active management  style and  by being
responsive to individual tenants' needs. The Company services tenants  primarily
through  its on  site, professional  management staff.  Management believes that
tenant satisfaction fosters long-term tenant relationships and creates expansion
opportunities, which, in  turn, enhance  the Company's ability  to maintain  and
increase  occupancy rates. The Company's success in this area is demonstrated in
part by the number of existing tenants which have re-leased their space,  leased
additional space to support their expansion needs or moved to other space within
the  Company's portfolio. During 1994 and  1995, the Company expanded 10 tenants
by a total of over 12,400 square feet. Recently, the Company was able to  expand
and  move  California Pizza  Kitchen from  approximately  17,224 square  feet in
Westwood Terrace to approximately 21,579 square feet in Skyview Center.  Another
example  of  the Company's  ability to  capitalize  on relocation  and expansion
opportunities is the relocation of Stanford Business Systems from 400  Corporate
Pointe  to expanded space with  its new parent company  at Skyview Center, which
also allowed the  Company to accommodate  a 7,311 square  foot expansion at  400
Corporate  Pointe by Pepperdine University, the  largest tenant at 400 Corporate
Pointe.
 
                                       61
<PAGE>
    The following  table sets  forth  certain historical  information  regarding
tenants  at the  Properties who  renewed an  existing lease  at or  prior to the
expiration of the existing lease:
 
                           HISTORICAL LEASE RENEWALS
 
<TABLE>
<CAPTION>
                                                                                                               TOTAL/
                                                                                                              WEIGHTED
                                                                                                               AVERAGE
                                                                         1993         1994         1995       1993-1995
                                                                      -----------  -----------  -----------  -----------
<S>                                                                   <C>          <C>          <C>          <C>
Number of leases expired during calendar year.......................          3           28           33           64
Number of lease renewals............................................          3           20           21           44
Percentage of leases renewed........................................        100%          71%          64%          69%
Aggregate rentable square footage of expiring leases................      2,870      112,539       99,577      214,986
Aggregate rentable square footage of lease renewals.................      2,870       92,057       75,213      170,140
Percentage of expiring rentable square footage renewed..............        100%          82%          76%          79%
</TABLE>
 
HISTORICAL TENANT IMPROVEMENTS AND LEASING COMMISSIONS
 
    The following  table sets  forth  certain historical  information  regarding
Tenant Improvement ("TI") and Leasing Commission ("LC") costs for tenants at the
Properties.  Based on  square footage, the  majority of leases  signed relate to
Renewals and  Re-tenanted Space  (78%), while  leases signed  relating to  Shell
Space  comprised 22%. Shell Space remaining at the Properties is less than 2% of
the aggregate rentable square footage of the Properties.
 
<TABLE>
<CAPTION>
                                                                                                      TOTAL/
                                                                                                     WEIGHTED
                                                                                                      AVERAGE
                                                                     1993       1994       1995      1993-1995
                                                                   ---------  ---------  ---------  -----------
<S>                                                                <C>        <C>        <C>        <C>
RENEWALS
  Number of Leases                                                         3         20         21          44
  Square Feet of Renewals                                              2,870     92,057     75,213     170,140
  TI per square foot.............................................     $ 3.58     $ 2.23     $ 8.05(i)     $ 4.83
  LC per square foot.............................................     $ 0.09     $ 3.44     $ 2.28      $ 2.87
                                                                   ---------  ---------  ---------  -----------
      Total TI and LC per square foot............................     $ 3.67     $ 5.67     $10.33      $ 7.70
                                                                   ---------  ---------  ---------  -----------
                                                                   ---------  ---------  ---------  -----------
RE-TENANTED SPACE (II)
  Number of Leases                                                         7         13         47          67
  Square Feet of Re-tenanted Space                                     9,910     22,265    108,430     140,605
  TI per square foot.............................................     $ 2.22     $ 9.04     $ 9.82      $ 9.16
  LC per square foot.............................................     $ 0.31     $ 2.72     $ 3.05      $ 2.81
                                                                   ---------  ---------  ---------  -----------
      Total TI and LC per square foot............................     $ 2.53     $11.76     $12.87      $11.97
                                                                   ---------  ---------  ---------  -----------
                                                                   ---------  ---------  ---------  -----------
SHELL SPACE (III)
  Number of Leases                                                         5          8         10          23
  Square Feet of Shell Space                                          17,389     16,130     53,876      87,395
  TI per square foot.............................................     $31.22     $36.25     $26.29      $29.11
  LC per square foot.............................................     $ 3.65     $ 7.19     $ 4.83      $ 5.03
                                                                   ---------  ---------  ---------  -----------
      Total TI and LC per square foot............................     $34.87     $43.44     $31.12      $34.14
                                                                   ---------  ---------  ---------  -----------
                                                                   ---------  ---------  ---------  -----------
TOTAL
  Number of Leases                                                        15         41         78         134
  Square Feet                                                         30,169    130,452    237,519     398,140
  TI per square foot.............................................     $19.06     $ 7.60     $12.99      $11.69
  LC per square foot.............................................     $ 2.22     $ 3.78     $ 3.21      $ 3.32
                                                                   ---------  ---------  ---------  -----------
      Total TI and LC per square foot............................     $21.28     $11.38     $16.20      $15.01
                                                                   ---------  ---------  ---------  -----------
                                                                   ---------  ---------  ---------  -----------
</TABLE>
 
- --------------
 (i) Includes tenant improvement costs relating  to one lease signed at  Anaheim
     City  Centre for which the Company incurred substantial renovation costs in
     connection with a  full floor  retrofit. Tenant improvement  costs for  the
     remaining leases renewed in 1995 equaled $4.67 per square foot.
 
                                       62
<PAGE>
 (ii) Does not include Shell Space build-out for 87,395 square feet.
 
(iii) Shell  Space remaining at the Properties is  less than 2% of the aggregate
      rentable space footage of the Properties.
 
HISTORICAL CAPITAL EXPENDITURES
 
    The following  table  sets  forth information  relating  to  the  historical
capital expenditures of the Company's Properties:
 
                        HISTORICAL CAPITAL EXPENDITURES
 
<TABLE>
<CAPTION>
                                                                                 1993        1994        1995
                                                                               ---------  ----------  ----------
<S>                                                                            <C>        <C>         <C>
Number of Properties (1).....................................................          3           8          10
Number of Square Feet........................................................    530,587   1,130,669   1,412,630
Capital Expenditures Incurred................................................  $   9,470  $   51,592  $  200,848
Weighted Average Capital Expenditures per square foot (2)....................  $    0.02  $     0.06  $     0.15
Three Year Weighted Average per square foot..................................                         $     0.10
</TABLE>
 
- --------------
(1)  Represents the actual  number of Properties  for which capital expenditures
    were incurred during the year.
 
(2) For those Properties owned  less than a full  year, computes the per  square
    foot  amount by annualizing  the capital expenditures amount  to a pro forma
    full year cost.
 
HISTORICAL OCCUPANCY
 
    The table below sets  forth the weighted average  occupancy rates, based  on
square  feet leased,  of the  Properties owned by  the Company  at the indicated
dates:
 
                           HISTORICAL OCCUPANCY RATES
 
<TABLE>
<CAPTION>
                                                  APPROXIMATE AGGREGATE   PERCENTAGE OF RENTABLE
DATE                                              RENTABLE SQUARE FEET     SQUARE FEET OCCUPIED
- ------------------------------------------------  ---------------------  -------------------------
<S>                                               <C>                    <C>
December 31, 1993...............................           530,587                      84%
June 30, 1994...................................           636,417                      87%
December 31, 1994...............................         1,130,669                      82%
June 30, 1995...................................         1,412,630                      84%
December 31, 1995...............................         2,632,318                      88%
</TABLE>
 
                                       63
<PAGE>
OFFICE SUBMARKETS AND PROPERTY INFORMATION
 
    The Company owns  and operates  24 Properties  comprising approximately  4.0
million  rentable square feet in suburban  Los Angeles County, Orange County and
San Diego County. The  following map shows the  relative geographic location  of
Los Angeles County, Orange County and San Diego County.
 
       Map depicting Los Angeles County, Orange County and San Diego County.
 
                                       64
<PAGE>
    The  Properties  are  located  in  a number  of  office  market  sectors and
submarkets within these counties as outlined in the table below:
 
                     PROPERTY MARKET SECTORS AND SUBMARKETS
                              PROPERTY STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                                         PERCENTAGE
                                                                             PERCENTAGE OF                   OF
                                                                                 TOTAL        ADJUSTED    PORTFOLIO
                                                                APPROXIMATE    PORTFOLIO     ANNUALIZED   ADJUSTED
                                                    NUMBER OF    RENTABLE      RENTABLE      BASE RENT   ANNUALIZED
                                                    PROPERTIES  SQUARE FEET   SQUARE FEET     ($000S)     BASE RENT
                                                    ----------  -----------  -------------   ----------  -----------
<S>                                                 <C>         <C>          <C>             <C>         <C>
LOS ANGELES COUNTY................................        21     3,269,468         80.9%     $  55,241       83.4%
  LOS ANGELES WEST OFFICE MARKET SECTOR
    West Los Angeles and Adjacent Submarkets......         6       908,889         22.5         18,958       28.6
    Culver City/Century Blvd. Submarkets..........         3       635,153         15.7          9,419       14.2
  LOS ANGELES NORTH OFFICE MARKET SECTOR
    Simi/Conejo Valley Submarkets.................         2       228,951          5.7          3,291        5.0
    West and Central San Fernando Valley
     Submarkets...................................         2       400,131          9.9          7,197       10.8
    East San Fernando Valley/Tri Cities
     Submarkets...................................         3       347,071          8.6          6,269        9.5
  LOS ANGELES SOUTH OFFICE MARKET SECTOR
    Long Beach and Cerritos/Norwalk Submarkets....         5       749,273         18.5         10,107       15.3
 
ORANGE COUNTY.....................................         2       224,746          5.6%         2,926        4.4
    Anaheim Submarket.............................         1       175,391          4.4          2,286        3.4
    Huntington Beach Submarket....................         1        49,355          1.2            640        1.0
SAN DIEGO COUNTY..................................         1       547,578         13.5%         8,065       12.2
    Central City (downtown San Diego) Submarket...         1       547,578         13.5          8,065       12.2
                                                          --
                                                                -----------       -----      ----------     -----
    TOTAL.........................................        24     4,041,792        100.0%     $  66,232      100.0%
                                                          --
                                                          --
                                                                -----------       -----      ----------     -----
                                                                -----------       -----      ----------     -----
</TABLE>
 
LOS ANGELES COUNTY OFFICE MARKET AND PROPERTIES
 
    According to  C&W, the  Los Angeles  County office  market contained  office
space  inventory of approximately 168 million  rentable square feet which, as of
December 31, 1995, had a  direct vacancy rate of  18.7%. The Los Angeles  County
office  market is divided  by C&W into  the following four  sectors: Los Angeles
West,  Los  Angeles  North,  Los   Angeles  South/South  Bay  and  Los   Angeles
Central/Downtown,  with  each  of  the  sectors  in  turn  composed  of numerous
submarkets as illustrated on the map below.
 
                                       65
<PAGE>
                     Map of Los Angeles County showing location
        of Los Angeles North, Los Angeles West, Los Angeles Central and
                    Los Angeles South office market sectors.
 
    During 1995, 272,154 square feet of office space was absorbed on a net basis
in  the  four  Los  Angeles  County   sectors  inclusive  of  the  Los   Angeles
Central/Downtown  sector  which had  net negative  absorption of  711,752 square
feet. Excluding the net negative absorption of the Los Angeles  Central/Downtown
sector,  the remaining three sectors absorbed approximately 984,000 square feet.
The direct  vacancy  rate for  Los  Angeles  County excluding  the  Los  Angeles
Central/Downtown  sector was 17.0% as of December 31, 1995, as compared to 17.3%
in 1994.  Set forth  below is  detailed market  information regarding  the  four
sectors within the Los Angeles County office market:
 
                               LOS ANGELES COUNTY
                            OFFICE MARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                               DIRECT         NET       WTD. AVG.
                                                                  NUMBER        DIRECT        VACANCY     ABSORPTION     ASKING
MARKET                                             INVENTORY     OF BLDGS    AVAILABILITIES*     RATE      YTD 1995    RENTAL RATE
- -----------------------------------------------  -------------  -----------  -------------  ------------  -----------  -----------
<S>                                              <C>            <C>          <C>            <C>           <C>          <C>
LOS ANGELES WEST...............................     50,014,880         367      9,289,766         18.6%      419,123    $   20.93
LOS ANGELES NORTH..............................     39,355,810         467      5,682,217         14.4%      196,129    $   20.80
LOS ANGELES SOUTH/SOUTH BAY....................     27,336,900         240      4,813,583         17.6%      368,654    $   18.14
LOS ANGELES CENTRAL/ DOWNTOWN..................     51,544,706         243     11,610,517         22.5%     (711,752)   $   18.44
                                                 -------------       -----   -------------         ---    -----------  -----------
    TOTAL......................................    168,252,296       1,317     31,396,083         18.7%      272,154    $   19.56
                                                 -------------       -----   -------------         ---    -----------  -----------
                                                 -------------       -----   -------------         ---    -----------  -----------
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
*   Does not include currently leased but available sublease space.
 
LOS ANGELES WEST OFFICE MARKET SECTOR
 
    The  Los Angeles West office market  sector contains several distinct office
submarkets, including, among others, the Beverly Hills, Century City,  Westwood,
West  Los Angeles, Marina  Area, Culver City, LAX,  Hollywood and West Hollywood
office submarkets. According to C&W,  there are approximately 50,014,880  square
feet  of office  space inventory  in the Los  Angeles West  office market sector
which comprises approximately 30% of the  office space inventory in Los  Angeles
County. As of December 31, 1995, the direct vacancy rate in the Los Angeles West
office  market sector was 18.6%. Collectively,  the office submarkets within the
Los Angeles  West office  market sector  had weighted  average asking  rents  of
$20.93 per square foot as of December 31, 1995.
 
                                       66
<PAGE>
                   Map of Los Angeles West office market sector.
 
    Several  of  the office  submarkets in  the Los  Angeles West  office market
sector, including Westwood, Beverly Hills, and Century City are considered among
the most prestigious and  desirable office locations in  Los Angeles County  and
command premium rental rates, with average annual asking rents of $28.32, $25.08
and  $23.28 per square  foot, respectively. The Golden  Triangle area of Beverly
Hills has  quoted annual  asking rents  ranging  from $19.80  to $42.00  with  a
predominant range of $24.00 to $36.00 per square foot. Certain office properties
within  these office submarkets achieve annual rental rates of as much as $39.00
per square foot. The tenant base of  office space users in the Los Angeles  West
office  market  sector  is primarily  composed  of firms  in  the entertainment,
advertising, professional and financial  services, legal, accounting,  insurance
and real estate industries.
 
    The  Company owns  nine Properties  located in  the Los  Angeles West office
market sector  that collectively  contain approximately  1,544,042 net  rentable
square  feet which  represents approximately  38% of  the total  rentable square
footage of the Properties. The Properties  are located in the office  submarkets
of   Beverly   Hills,  Century   City,  Westwood,   West  Los   Angeles,  Culver
City/Westchester, LAX and the 6000 Block of Wilshire Boulevard (a segment of the
Miracle Mile office submarket adjacent to Beverly Hills). No new development  of
mid-rise  or  high-rise  properties is  permitted  in the  Beverly  Hills office
submarket as  the City  of Beverly  Hills has  enacted zoning  limitations  that
impose  a three-story height limit for all new commercial development. Set forth
below is detailed submarket information regarding the Los Angeles West sector:
 
                                       67
<PAGE>
                                LOS ANGELES WEST
                          OFFICE SUBMARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                            DIRECT          NET       WTD. AVG.
                                                             NUMBER         DIRECT         VACANCY      ABSORPTION     ASKING
SUBMARKET                                     INVENTORY     OF BLDGS    AVAILABILITIES(1)      RATE      YTD 1995    RENTAL RATE
- -------------------------------------------  ------------  -----------  --------------  --------------  -----------  -----------
<S>                                          <C>           <C>          <C>             <C>             <C>          <C>
BEVERLY HILLS/CENTURY CITY.................    14,351,740          89       2,340,143        16.3%         317,263    $   24.12
    Beverly Hills..........................     5,499,685          63       1,100,405        20.0%         143,812    $   25.08
    Century City...........................     8,852,055          26       1,239,738        14.0%         173,451    $   23.28
WESTWOOD/WEST LOS ANGELES..................    17,304,111         139       2,924,088        16.9%          67,888    $   23.88
    Westwood...............................     4,084,735          21         579,241        14.2%         172,706    $   28.32
    West Los Angeles.......................     3,798,977          34         821,453        21.6%(2)     (120,211)   $   18.84
    Brentwood..............................     3,254,337          23         399,587        12.3%         148,907    $   24.84
    Santa Monica...........................     6,005,655          58       1,087,661        18.1%        (141,470)   $   25.20
    Pacific Palisades......................       160,407           3          36,146        22.5%           7,956    $   20.64
MARINA AREA/CULVER CITY/ LAX...............     8,959,927          63       1,912,170        21.3%         223,275    $   14.85
    Culver City/Westchester................     3,643,649          32         537,237        14.7%          52,844    $   17.28
    Los Angeles Airport (LAX)..............     4,211,847          20       1,232,354        29.3%(3)       77,496    $   13.20
    Marina Del Rey/Venice/MarVista.........     1,104,431          11         142,579        12.9%          92,935    $   19.92
PARK MILE/WEST HOLLYWOOD...................     9,399,102          76       2,113,365        22.5%        (189,303)   $   18.80
    Miracle Mile...........................     4,444,716          20       1,140,562        25.7%        (242,985)   $   19.47
    Park Mile..............................     1,079,452          11         252,993        23.4%          23,958    $   16.23
    Hollywood..............................     2,576,475          30         488,686        19.0%          43,438    $   15.72
    West Hollywood.........................     1,298,459          15         231,124        17.8%         (13,714)   $   24.84
    TOTAL..................................    50,014,880         367       9,289,766        18.6%         419,123    $   20.93
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
(1) Does not include currently leased but available sublease space.
 
(2) The  marginally  higher  vacancy  in  this  office  submarket  is  partially
    attributable to the loss of a major tenant (Aurora, formerly Executive Life)
    which previously occupied over 300,000 square feet in two properties.
 
(3) The 29.3% direct vacancy rate for the LAX office submarket compared to other
    office  submarkets in the Los Angeles West office market sector reflects the
    fact that  of the  20  buildings in  such  submarket, only  seven  buildings
    comprising  22.2% of such submarket's rentable square feet are classified by
    C&W as Class A office properties  (all of which were completed between  1981
    and 1987), with the remaining 13 properties classified as Class B or Class C
    properties.  The Class B and Class C properties do not directly compete with
    the newer and higher quality Skyview Centers I and II and the other Class  A
    properties in the LAX office submarket. The direct vacancy level for Class A
    properties in the LAX office submarket was 25.0% as of December 31, 1995.
 
PROPERTIES LOCATED IN THE BEVERLY HILLS OFFICE SUBMARKET:
 
    9665  WILSHIRE.  9665  Wilshire is a  ten-story office tower  located in the
Golden Triangle of Beverly Hills  completed in 1972 and substantially  renovated
in  1992 and 1993.  The Property contains  158,345 rentable square  feet and 444
parking spaces. As  of April  30, 1996  the Property  was 96.3%  leased with  an
average  Adjusted  Annualized  Base  Rent  per  leased  square  foot  of $31.00.
According to C&W, as of April 30,  1996, the 9665 Wilshire Boulevard Peer  Group
(the term "Peer Group" as used herein with respect to each of the Properties has
the  meaning set forth in the Glossary) contained approximately 1,807,958 square
feet of office space inventory in  17 buildings and had weighted average  annual
asking  rental rates ranging from $27.14 to $29.49 per square foot with a direct
vacancy rate of 28.7%. Primary tenants at this Property include Sotheby's,  Inc.
(17,222  square feet), Merrill Lynch (15,363  square feet), Smith Barney (15,321
square feet), Gruntal & Co. (15,321  square feet), J.B. Oxford Holdings  (15,321
square  feet) and Sutro & Co. (11,797  square feet). Aggregate square footage of
leases expiring in 1996, 1997,  and 1998 represent 3.8%,  22.0% and 5.5% of  the
Property's occupied square footage, respectively.
 
                                       68
<PAGE>
    BEVERLY  ATRIUM.   Beverly Atrium is  a 3-story office  complex completed in
1989 of steel frame construction with  a stone and brick exterior. The  Property
contains  61,314 rentable  square feet and  245 parking spaces.  The Property is
located immediately south of the Golden Triangle area. As of April 30, 1996, the
Property was  100% leased  with an  average Adjusted  Annualized Base  Rent  per
leased  square  foot of  $22.70. According  to C&W,  as of  April 30,  1996, the
Beverly Atrium  Peer  Group contained  approximately  1,807,958 square  feet  of
office  space inventory in  17 buildings and had  weighted average annual asking
rental rates ranging from $27.14 to $29.49 per square foot with a direct vacancy
rate of 28.7%. Primary  tenants at this Property  include GE Commercial  Finance
(18,489  square  feet),  Islands  Restaurant  (7,404  square  feet)  and  Unigem
International (10,281 square feet). Aggregate square footage of leases  expiring
in  1996,  1997, and  1998  represent 7.8%,  4.3%  and 21.2%  of  the Property's
occupied square footage, respectively.
 
PROPERTY LOCATED IN THE CENTURY CITY OFFICE SUBMARKET:
 
    CENTURY PARK CENTER.  Century Park  Center contains a 15-story office  tower
and  an adjacent  three story  office building  completed in  1972. The Property
contains approximately 247,483 rentable square feet with 674 parking spaces. The
building was renovated during 1994,  which included redesigning the  full-length
glass facade, refilming all of the curtain wall spandrels and installing tenemic
metal  to  highlight the  exterior window  frames.  In addition,  the building's
security and energy  management systems and  facilities were upgraded,  lighting
was  retrofitted, and all common areas were renovated. As of April 30, 1996, the
Property was 85.9%  leased with  an average  Adjusted Annualized  Base Rent  per
leased  square  foot of  $20.98. According  to C&W,  as of  April 30,  1996, the
Century Park Center Peer Group contained approximately 3,649,937 square feet  of
office  space inventory in  11 buildings and had  weighted average annual asking
rental rates ranging from $20.64 to $24.96 per square foot with a direct vacancy
rate of 21.8%. The Property is primarily tenanted with numerous professional and
medical related tenants ranging predominantly in size from 1,000 square feet  to
3,000  square feet. The largest tenant at this Property is NME Hospitals (24,069
square feet)  which occupies  approximately  10% of  the rentable  square  feet.
Aggregate  square footage of  leases expiring in 1996,  1997, and 1998 represent
11.8%, 10.2% and 13.5% of the Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE WESTWOOD OFFICE SUBMARKET:
 
    WESTWOOD TERRACE.  Westwood Terrace  is a 5-story office building  completed
in  1988 of  steel frame  construction with a  white precast  concrete panel and
blue-green continuous ribbon glass exterior with layered terraces on each story.
The Property contains approximately 135,583 rentable square feet and 450 parking
spaces. As of  April 30, 1996,  the Property  was 96.9% leased  with an  average
Adjusted  Annualized Base  Rent per leased  square foot of  $25.11. According to
C&W,  as  of  April  30,  1996,  the  Westwood  Terrace  Peer  Group   contained
approximately  1,004,079 square feet of office  space inventory in six buildings
and had  weighted average  annual asking  rental rates  ranging from  $22.50  to
$31.87  per square foot with a direct  vacancy rate of 11.2%. Primary tenants at
this Property include The Hearst Corporation (25,731 square feet) and Blue Cross
of California (15,261 square feet). Aggregate square footage of leases  expiring
in  1996,  1997, and  1998  represent 18.7%,  2.9%  and 5.4%  of  the Property's
occupied square footage, respectively.
 
PROPERTY LOCATED IN THE WEST LOS ANGELES OFFICE SUBMARKET:
 
    1950 SAWTELLE.  1950 Sawtelle is a three-story, office building completed in
1988, of steel frame construction with a brick exterior. The Property, which was
renovated in 1995, contains approximately  103,620 rentable square feet and  has
254  parking spaces. As of April 30, 1996, the Property was 76.3% leased with an
average Adjusted  Annualized  Base  Rent  per  leased  square  foot  of  $20.21.
According  to C&W, as of April 30,  1996, the 1950 Sawtelle Peer Group contained
approximately 1,814,375 square feet  of office space  inventory in 10  buildings
and  had  weighted average  annual asking  rental rates  ranging from  $17.74 to
$19.09 per  square foot  with a  direct vacancy  rate of  25.8%. The  Property's
tenant  base is  largely comprised of  numerous small and  medium sized service,
medical  and  other   professional  tenants  who   occupy  tenant  suites   that
predominantly  range in size  from 1,500 square  feet to 3,000  square feet. The
largest tenant  at this  Property, Integrated  Decisions (10,635  square  feet),
occupies  approximately 10.26% of the Property's aggregate rentable square feet.
Aggregate square footage of  leases expiring in 1996,  1997, and 1998  represent
5.3%, 30.9% and 50.6% of the Property's occupied square footage, respectively.
 
                                       69
<PAGE>
PROPERTIES LOCATED IN THE CULVER CITY/WESTCHESTER OFFICE SUBMARKET:
 
    400  CORPORATE  POINTE.    400 Corporate  Pointe  is  an  eight-story office
building completed in 1987  of steel-framed construction with  a dark glass  and
concrete  panel exterior.  The Property contains  approximately 164,845 rentable
square feet with  588 parking spaces.  The Property  is within 1/2  mile of  the
I-405 and I-90 Freeways and La Cienega Boulevard, a major north-south artery. As
of  April  30, 1996,  the Property  was  91.5% leased  with an  average Adjusted
Annualized Base Rent per leased square foot  of $19.72. According to C&W, as  of
April  30, 1996,  the 400  Corporate Pointe  Peer Group  contained approximately
1,792,632 square feet of office space inventory in 14 buildings and had weighted
average annual asking rental rates ranging from $17.22 to $17.81 per square foot
with a direct vacancy  rate of 26.9%. Primary  tenants at this Property  include
Pepperdine  University (82,441  square feet)  which is  subject to  a triple net
lease expiring in the year 2002,  and Crawford & Co. (20,347). Aggregate  square
footage  of leases  expiring in  1996, 1997, and  1998 represent  1.3%, 5.9% and
15.6% of the Property's occupied square footage, respectively.
 
    BRISTOL PLAZA.  Bristol Plaza is  a four-story office building completed  in
1982  of steel-frame construction  with a brushed  aluminum and reflective glass
exterior. The  Property contains  84,014 rentable  square feet  and 320  parking
spaces.  The Property is within  1/2 mile of the I-405  and I-90 Freeways and La
Cienega Boulevard,  a  major north-south  artery.  As  of April  30,  1996,  the
Property  was 78.7%  leased with  an average  Adjusted Annualized  Base Rent per
leased square  foot of  $18.02. According  to C&W,  as of  April 30,  1996,  the
Bristol Plaza Peer Group contained approximately 1,873,463 square feet of office
space  inventory in 14  buildings and had weighted  average annual asking rental
rates ranging from $17.24 to $17.83 per  square foot with a direct vacancy  rate
of  25.6%. Primary tenants  at this Property include  Bristol A/R (12,163 square
feet) and  the  State  of  California (10,527  square  feet).  No  other  tenant
comprises  more than  8% of the  Property's aggregate  square footage. Aggregate
square footage of leases expiring in  1996, 1997, and 1998 represent 5.2%,  5.9%
and 36.1% of the Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE LAX OFFICE SUBMARKET:
 
    SKYVIEW  CENTER.   Skyview  Center consists  of  two 11-and  12-story office
towers completed in  1981 and  1987, respectively, of  steel frame  construction
with  a reflective glass and painted metal mullions exterior. The buildings were
renovated in 1995. The Property  contains approximately 386,294 rentable  square
feet  with 393 parking spaces.  Adjacent to the Property  is a 14.4 acre surface
parking lot containing approximately 2,000  parking spaces that are utilized  as
short  and long term airport parking.  Each building comprises approximately 50%
of the total rentable area. As of April 30, 1996, the Property was 80.6%  leased
with  an average Adjusted Annualized Base Rent per leased square foot of $16.87.
According to C&W, as of April 30, 1996, the Skyview Center Peer Group  contained
approximately  2,645,382 square feet  of office space  inventory in 11 buildings
located along the  Century Boulevard  and in  El Segundo  with weighted  average
annual  asking rental rates ranging from $17.68 to $20.48 per square foot with a
direct vacancy rate of 13.8%. Primary tenants at this Property include  Logicon,
Inc.  (74,174 square feet), Learning Tree International (34,145 square feet) and
American Tours International (32,586 square  feet). Aggregate square footage  of
leases  expiring in 1996, 1997,  and 1998 represent 3.0%,  10.1% and 7.2% of the
Property's occupied square footage, respectively.
 
                                       70
<PAGE>
PROPERTY LOCATED IN THE 6000 BLOCK OF WILSHIRE BOULEVARD OFFICE MICROMARKET(1):
 
    THE  NEW WILSHIRE.  The New Wilshire is a 16-story office tower completed in
    1986 of steel frame construction with  a tempered vision and spandrel  glass
    curtain  wall exterior. The Property contains approximately 202,544 rentable
    square feet and 398 parking  spaces. As of April  30, 1996 the Property  was
    84.1% leased with an average Adjusted Annualized Base Rent per leased square
    foot  of $20.48. According  to C&W, as  of April 30,  1996, The New Wilshire
    Peer Group contained  approximately 3,098,896  square feet  of office  space
    inventory  in seven buildings and had  weighted average annual asking rental
    rates ranging from $20.04  to $23.90 per square  foot with a direct  vacancy
    rate  of 19.9%.  Primary tenants at  this Property  include Grey Advertising
    (47,652 square  feet),  Muse  Cordero  (15,551  square  feet)  and  Hallmark
    Entertainment  (14,379  square  feet). Aggregate  square  footage  of leases
    expiring in 1996,  1997, and 1998  represent 13.5%, 14.4%  and 16.7% of  the
    Property's occupied square footage, respectively.
- ------------------------
    (1)  The Company  defines the geographical  location where  this Property is
       located as a separate office micromarket. While C&W defines this location
       as a segment of the Miracle  Mile office submarket, the Company  believes
       that  this location functions  as a separate  office micromarket which is
       independent of the  overall Miracle  Mile office  submarket. The  Company
       further  believes  that  the  6000  Block  of  Wilshire  Boulevard office
       micromarket is primarily influenced by, and is a peripheral or  satellite
       micromarket of, the adjacent Beverly Hills office submarket.
 
LOS ANGELES NORTH OFFICE MARKET SECTOR
 
    The  Los Angeles North office market  sector, as defined by C&W, encompasses
four market areas located  primarily in the San  Fernando Valley, Santa  Clarita
Valley,  and  Conejo  Valley  areas  of  Los  Angeles  County,  and  portions of
southeastern Ventura County. The four primary  markets in the Los Angeles  North
office  market  sector include:  Simi/Conejo Valley,  West San  Fernando Valley,
Central San Fernando Valley, and East San Fernando Valley/Tri Cities, with  each
of these office markets in turn composed of several office submarkets.
 
                 Map of Los Angeles North office market sector.
 
    The  distinct  office submarkets  within The  Los  Angeles North  sector are
indicated in  the  table  below.  According  to  C&W,  there  are  approximately
39,400,000 square feet of office space inventory in the Los Angeles North office
market  sector which comprise approximately 23% of the office space inventory in
Los
 
                                       71
<PAGE>
Angeles County. As of December 31, 1995 the collective submarkets within the Los
Angeles North office  market sector  had a direct  vacancy rate  of 14.4%,  with
weighted average annual asking rents of $20.80 per square foot.
 
    The  Company owns seven  Properties located in the  Los Angeles North office
market sector that  collectively contain approximately  976,153 rentable  square
feet  which represents approximately 24% of the total rentable square footage of
the Properties. The Properties are located in the office submarkets of  Westlake
Village,  Calabasas, Woodland Hills,  Encino, Glendale, Burbank  City Center and
Pasadena. Set forth below  is detailed submarket  information regarding the  Los
Angeles North sector.
 
                               LOS ANGELES NORTH
                          OFFICE SUBMARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                           DIRECT        NET              WTD. AVG.
                                             NUMBER          DIRECT        VACANCY    ABSORPTION           ASKING
SUBMARKET                       INVENTORY   OF BLDGS   AVAILABILITIES(1)    RATE       YTD 1995          RENTAL RATE
- ------------------------------  ----------  --------   ------------------  -------   ------------        -----------
<S>                             <C>         <C>        <C>                 <C>       <C>                 <C>
SIMI/CONEJO VALLEY............   4,537,562     87                510,332    11.2%         243,948          $18.36
  Simi Valley.................     196,326      6                 28,401    14.5%          32,363          $14.64
  Thousand Oaks/Newbury
   Park.......................     701,607     14                239,761    34.2%            (597)         $19.80
  Westlake Village............   1,735,399     32                149,247     8.6%         176,534          $17.16
  Agoura Hills................     497,672     10                 40,588     8.2%          (7,747)         $15.48
  Calabasas...................   1,406,558     25                 52,335     3.7%          43,395          $19.32
WEST SAN FERNANDO VALLEY......   8,487,933     96              1,404,681    16.5%         209,106          $21.60
  Northridge/Reseda...........     266,000      5                 14,408     5.4%         110,394          $16.92
  Tarzana.....................     508,929     10                 95,615    18.8%          11,998          $19.08
  Canoga Park/Chatsworth......   1,316,333     24                279,918    21.3%        (109,904)         $16.32
  Warner Center...............   5,325,021     39                887,559    16.7%         164,899          $23.88
  Woodland Hills..............   1,071,650     18                127,181    11.9%          31,719          $18.84
CENTRAL SAN FERNANDO VALLEY...   8,525,170    111              1,528,178    17.9%        (181,315)         $19.68
  Encino......................   3,910,209     39                627,549    16.0%         (90,048)         $21.36
  Sherman Oaks................   2,264,136     27                429,972    19.0%          (7,327)         $20.40
  Van Nuys....................   1,442,363     27                293,101    20.3%         (38,627)         $17.16
  Park City/Granada/Mission
   Hills......................     386,090      7                 64,839    16.8%         (27,904)         $15.84
  Valencia/Newhall............     522,372     11                112,717    21.6%         (17,409)         $17.04
EAST SAN FERNANDO VALLEY/TRI-
 CITIES.......................  17,805,145    173              2,239,026    12.6%         (75,610)         $21.61
  Burbank-Media District......   2,043,350     15                 31,937     1.6%          87,406          $28.43
  Burbank-City Center.........   1,710,879     23                242,563    14.2%         (26,003)         $18.83
  Glendale....................   5,052,071     44                799,750    15.8%        (151,308)(2)      $23.16
  Pasadena....................   5,542,296     57                732,964    13.2%        (105,482)         $21.47
  Pasadena East...............     574,421      6                206,210    35.9%          (4,418)         $18.69
  Studio City/Universal
   City.......................   1,763,500     15                 79,999     4.5%          56,744          $25.20
  North Hollywood.............   1,118,628     13                145,603    13.0%          67,451          $19.08
                                ----------    ---             ----------   -------   ------------        -----------
    TOTAL.....................  39,355,810    467              5,682,217    14.4%         196,129          $20.80
                                ----------    ---             ----------   -------   ------------        -----------
                                ----------    ---             ----------   -------   ------------        -----------
</TABLE>
 
- --------------
Source: Cushman & Wakefield
 
(1) Does not include currently leased but available sublease space.
 
(2)  The  negative  absorption  in the  Glendale  office  submarket  during 1995
    primarily reflects the activity of one  building, where the Bank of  America
    vacated  approximately  200,000  square  feet, and  is  in  contrast  to the
    positive absorption experienced in 1993  and 1994. During the first  quarter
    of 1996 two major
 
                                       72
<PAGE>
    entertainment tenants, Walt Disney and Turner Animation, entered into leases
    in  the Glendale office  submarket of 150,000 square  feet and 70,000 square
    feet, respectively, both  of which are  located in the  premises vacated  in
    1995 by Bank of America.
 
PROPERTY LOCATED IN THE WESTLAKE VILLAGE OFFICE SUBMARKET:
 
    5601  LINDERO CANYON.   5601 Lindero  Canyon is a  two-story office building
    completed in 1989 of tilt up concrete construction with a white concrete and
    black glass  facade. The  Property contains  approximately 105,830  rentable
    square  feet and 415 parking spaces. As  of April 30, 1996, the building was
    100% triple net  leased with an  average Adjusted Annualized  Base Rate  per
    leased  square foot of $11.15.  According to C&W, as  of April 30, 1996, the
    5601 Lindero Canyon Peer Group  contained approximately 630,451 square  feet
    of  office space inventory in 9 buildings  and had a weighted average annual
    asking rental rate of $19.03 per square  foot with a direct vacancy rate  of
    4.7%. The Property has two tenants, Hewlett-Packard (53,700 square feet) and
    Candle  Corporation (52,130 square feet), both of which operate under triple
    net leases that expire in 2002.
 
PROPERTY LOCATED IN THE CALABASAS OFFICE SUBMARKET:
 
    CALABASAS COMMERCE CENTER.  Calabasas Commerce Center is comprised of  four,
    one- and two-story office buildings completed in 1990. The Property contains
    approximately  123,121 rentable square feet  and 464 surface parking spaces.
    As of April 30, 1996, the Property was 100% leased with an average  Adjusted
    Annualized  Base Rent per leased square foot of $17.14. According to C&W, as
    of April  30,  1996, the  Calabasas  Commerce Center  Peer  Group  contained
    approximately  371,634  square  feet  of  office  space  inventory  in  five
    buildings and had a weighted average annual asking rental rate of $19.16 per
    square foot with  a direct  vacancy rate of  5.4%. Primary  tenants at  this
    Property   include  the  City   of  Calabasas  (9,243   square  feet),  Wyle
    Laboratories (10,841 square feet), Novalogic Inc.(13,932 square feet),  Fort
    Dearborn  Life Insurance (9,128 square feet) and Breath Assure (8,613 square
    feet). One  tenant,  XIRCOM,  Inc.  leases  an  entire  building  comprising
    approximately  46,321 square feet. XIRCOM, Inc. vacated the property in 1994
    in order to relocate to another  office building that could accommodate  its
    expansion  requirements. To date, XIRCOM, Inc.  has continued to meet all of
    its rental payment obligations under its  lease, which expires in 1997,  and
    is  currently attempting to sublease its  space. Aggregate square footage of
    leases expiring in 1996, 1997 and 1998 represent 7.4%, 55.8% and 3.6% of the
    Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE WOODLAND HILLS OFFICE SUBMARKET:
 
    WOODLAND HILLS  FINANCIAL CENTER.    Woodland Hills  Financial Center  is  a
    12-story  office tower with an adjacent four-story office building completed
    in 1972 and renovated in  1995. The Property contains approximately  221,790
    rentable  square feet  and 510  parking spaces.  As of  April 30,  1996, the
    building was 86.7% leased with an average Adjusted Annualized Base Rent  per
    leased  square foot of $21.81.  According to C&W, as  of April 30, 1996, the
    Woodland Hills Financial Center  Peer Group contained approximately  854,004
    square  feet of  office space  inventory in  six buildings  and had weighted
    average annual asking rental rates ranging from $22.50 to $22.97 per  square
    foot  with a direct vacancy rate of  10.0%. Primary tenants at this Property
    include Presidential Mortgage (19,600 square feet), Dennison, Bennet & Press
    (14,386 square feet),  Pacific Homes  (13,989 square feet)  and Wells  Fargo
    Bank  (8,983 square  feet). Aggregate square  footage of  leases expiring in
    1996, 1997  and 1998  represent 15.1%,  7.7%, and  23.0% of  the  Property's
    occupied square footage, respectively.
 
PROPERTY LOCATED IN THE ENCINO OFFICE SUBMARKET:
 
    16000 VENTURA BOULEVARD.  16000 Ventura Boulevard is a 12-story office tower
    completed  in 1980 of steel reinforced  concrete with a blue glass exterior.
    The building  was renovated  in 1996.  The Property  contains  approximately
    178,341  rentable square feet and 630 parking  spaces. As of April 30, 1996,
    the building was 85.8% leased with an average Adjusted Annualized Base  Rent
    per  leased square foot of  $19.63. According to C&W,  as of April 30, 1996,
    the 16000  Ventura Boulevard  Peer Group  contained approximately  2,418,206
    square  feet  of office  space inventory  in 12  buildings and  had weighted
    average annual asking rental rates ranging from $20.21 to $22.45 per  square
    foot with a direct vacancy rate of
 
                                       73
<PAGE>
    15.0%.  Primary tenants at this  Property include Barrister Executive Suites
    (16,142 square feet), Information Technology (8,665 square feet),  Greenberg
    &  Bass  (8,814 square  feet) and  Cohen &  Steinbrech (8,199  square feet).
    Aggregate square footage of leases expiring in 1996, 1997 and 1998 represent
    9.2%,  31.4%  and   19.5%  of  the   Property's  occupied  square   footage,
    respectively.
 
PROPERTY LOCATED IN THE GLENDALE OFFICE SUBMARKET:
 
    425  WEST  BROADWAY.   425 West  Broadway  is a  four story  office building
    completed in 1984  of steel reinforced  concrete with a  concrete panel  and
    reflective  glass exterior. The building was renovated in 1996. The Property
    contains approximately 71,489 rentable square feet with 205 parking  spaces.
    As of April 30, 1996, the Property was 89.9% leased with an average Adjusted
    Annualized  Base Rent per leased square foot of $19.45. According to C&W, as
    of April 30, 1996, the 425 West Broadway Peer Group contained  approximately
    409,078  square feet  of office  space inventory  in four  buildings and had
    weighted average annual asking  rental rates ranging  from $19.78 to  $20.43
    per square foot with a direct vacancy rate of 11.0%. Primary tenants at this
    Property  include  Glendale  News  (18,189 square  feet)  and  TIB Insurance
    (14,075 square feet). Aggregate square  footage of leases expiring in  1996,
    1997  and 1998  represent 2.7%,  6.3% and  38.4% of  the Property's occupied
    square footage, respectively.
 
PROPERTY LOCATED IN THE BURBANK CITY CENTER OFFICE SUBMARKET:
 
    303 GLENOAKS.  303 Glenoaks is a 10-story office tower completed in 1983  of
    steel  frame  construction with  a black  glass  curtain wall  exterior. The
    Property, which  was  renovated  in  1996,  contains  approximately  175,449
    rentable  square feet  with 526  parking spaces. As  of April  30, 1996, the
    Property was 95.7% leased with an average Adjusted Annualized Base Rent  per
    leased  square foot of $20.38.  According to C&W, as  of April 30, 1996, the
    303 Glenoaks  Peer  Group contained  approximately  452,850 square  feet  of
    office space inventory in 6 buildings and had weighted average annual asking
    rental  rates ranging from  $21.28 to $21.85  per square foot  with a direct
    vacancy rate  of  17.5%.  Primary  tenants  at  this  Property  include  DiC
    Entertainment  (51,708 square feet),  Insurance Company of  the West (23,450
    square feet),  New  Wave Entertainment  (18,639  square feet),  NCI  (11,142
    square   feet)  and  Lockheed  Finance  Corporation  (10,319  square  feet).
    Aggregate square footage of leases expiring in 1996, 1997 and 1998 represent
    0.4%, 1.6% and 5.1% of the Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE PASADENA OFFICE SUBMARKET:
 
    70 SOUTH LAKE.  70 South Lake is an 11-story office tower completed in  1982
    of  steel frame construction  with concrete panelled  curtain wall, aluminum
    spandrel and  glass  exterior.  The  building was  renovated  in  1994.  The
    Property contains approximately 100,133 rentable square feet and 329 parking
    spaces.  As of April 30, 1996, the Property was 76.6% leased with an average
    Adjusted Annualized Base Rent per leased square foot of $20.83. According to
    C&W, as  of  April  30,  1996,  the  70  South  Lake  Peer  Group  contained
    approximately  1,651,940  square feet  of  office space  inventory  in eight
    buildings and had weighted average  annual asking rental rates ranging  from
    $23.04 to $25.71 per square foot with a direct vacancy rate of 9.2%. Primary
    tenants  at this  Property include  Countrywide Funding  Corporation (16,726
    square feet), Union Bank (18,481 square feet) and Smith Barney (9,415 square
    feet). No leases expire in  the next two years  and 10.9% of the  Property's
    occupied square footage expires in 1998.
 
                                       74
<PAGE>
LOS ANGELES SOUTH OFFICE MARKET SECTOR
 
    The  Los Angeles South office market  sector, as defined by C&W, encompasses
three market areas located primarily in the South Bay area of Los Angeles County
and is the smallest office market sector in Los Angeles County. The Los  Angeles
South  office  market sector  is composed  of three  primary office  markets: El
Segundo, Torrance  and Long  Beach, with  each  of the  office markets  in  turn
composed of a number of submarkets.
 
                    [Insert Map of Los Angeles South Sector]
 
    The  Los Angeles  South office market  sector contains  nine distinct office
submarkets as  outlined  in  the  table  below.  According  to  C&W,  there  are
approximately  27,336,900  square  feet of  office  space inventory  in  the Los
Angeles South  office market  sector  which comprise  approximately 16%  of  the
office  space  inventory in  Los Angeles  County.  As of  December 31,  1995 the
collective office submarkets within the  Los Angeles South office market  sector
had a direct vacancy rate of 17.6%, with weighted average annual asking rents of
$18.14 per square foot.
 
    The  Company owns  five Properties located  in the Los  Angeles South office
market sector that  collectively contain approximately  749,273 rentable  square
feet, which represents approximately 19% of the total rentable square footage of
the Properties. The Properties within the Los Angeles South office market sector
are all located in the Long Beach office market. The Long Beach office market is
located south of El Segundo and Torrance and north of Huntington Beach. The Long
Beach  office market is composed of  five office submarkets: Long Beach Airport/
I-405 Freeway  Corridor,  North Long  Beach,  Downtown Long  Beach,  Long  Beach
Marina,  and  Cerritos/Norwalk.  The  Long  Beach  market  is  one  of  the more
prestigious office  markets  in the  Los  Angeles South  office  market  sector.
According  to C&W, as  of December 31,  1995 the Long  Beach and adjacent office
market had an office space inventory of approximately 10,500,161 square feet  in
89  buildings with a  direct vacancy rate  of 17.6% and  weighted average annual
asking rents of $18.64, down from a  direct vacancy rate of 17.3% with  weighted
average  annual asking rents of $19.20 per  square foot as of December 31, 1994.
Set forth  below is  detailed submarket  information regarding  the Los  Angeles
South sector:
 
                                       75
<PAGE>
                               LOS ANGELES SOUTH
                          OFFICE SUBMARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                           DIRECT          NET        WTD. AVG.
                                             NUMBER          DIRECT        VACANCY      ABSORPTION     ASKING
SUBMARKET                       INVENTORY   OF BLDGS   AVAILABILITIES(1)    RATE         YTD 1995    RENTAL RATE
- ------------------------------  ----------  --------   ------------------  -------     ------------  -----------
<S>                             <C>         <C>        <C>                 <C>         <C>           <C>
EL SEGUNDO....................   9,424,153     69              1,471,128    15.6%           326,730    $17.88
TORRANCE......................   7,412,586     82              1,490,376    20.1%          (307,739)   $17.76
LONG BEACH....................  10,500,161     89              1,852,079    17.6%           349,663    $18.64
  Long Beach Airport/I-405
   Fwy. Corridor..............   2,130,258     19                319,077    15.0%           419,823    $18.48
  North Long Beach............   1,020,376     13                222,907    21.8%               (46)   $15.00
  Downtown Long Beach.........   3,811,553     20                999,351    26.2%          (129,899)   $19.92
  Long Beach Marina...........     457,018      6                 55,247    12.1%            19,419    $18.96
  Cerritos/Norwalk............   3,080,956     31                255,497     6.7%            40,366    $16.95
                                ----------    ---             ----------   -------     ------------  -----------
    TOTAL.....................  27,336,900    240              4,813,583    17.6%           368,654    $18.14
                                ----------    ---             ----------   -------     ------------  -----------
                                ----------    ---             ----------   -------     ------------  -----------
</TABLE>
 
- --------------
Source: Cushman & Wakefield
(1) Does not include currently leased but available sublease space.
 
PROPERTIES LOCATED IN THE LONG BEACH AIRPORT/I-405 FREEWAY CORRIDOR OFFICE
SUBMARKET:
 
    4811  AIRPORT PLAZA DRIVE.   4811 Airport Plaza Drive  is a six-story office
    building completed in 1987 of steel  frame construction and red granite  and
    reflective  glass exterior. The building was renovated in 1995. The Property
    contains approximately 121,610 rentable square feet with 707 parking  spaces
    and  is subject to a ground lease with  the City of Long Beach which expires
    in 2055. As of April  30, 1996, the building was  100% triple net leased  to
    McDonnell Douglas at an Adjusted Annualized Base Rent per leased square foot
    of  $8.64. According to  C&W, as of  April 30, 1996,  the 4811 Airport Plaza
    Drive Peer Group  contained approximately  1,230,855 square  feet of  office
    space inventory in 9 buildings and had weighted average annual asking rental
    rates  ranging from $22.81 to  $26.26 per square foot  with a direct vacancy
    rate of 4.9%. The McDonnell Douglas lease expires in 2005.
 
    4900 AND 4910 AIRPORT PLAZA  DRIVE.  4900 and  4910 Airport Plaza Drive  are
    two three-story, connected office buildings completed in 1987 of steel frame
    construction with granite and reflective glass exteriors. The buildings were
    renovated  in  1995. The  Property  contains approximately  150,403 rentable
    square feet. The Property has the use  of 520 parking spaces and is  subject
    to  a ground lease with the City of  Long Beach which expires in 2055. As of
    April 30, 1996, the Property was 100% triple net leased to McDonnell Douglas
    at an  Adjusted  Annualized Base  Rent  per  leased square  foot  of  $7.80.
    According  to C&W,  as of April  30, 1996,  the 4900 and  4910 Airport Plaza
    Drive Peer Group  contained approximately  1,202,062 square  feet of  office
    space  inventory in  nine buildings and  had weighted  average annual asking
    rental rates ranging  from $22.81 to  $26.26 per square  foot with a  direct
    vacancy rate of 5.1%. The McDonnell Douglas lease expires in 2005.
 
    5000  EAST  SPRING.   5000  East Spring  is  an eight-story  office building
    completed in 1989 of steel framed construction with a travertine marble  and
    reflective  glass exterior. The building was renovated in 1995. The Property
    contains 163,358  net rentable  square feet  and 2,504  parking spaces.  The
    Property  is subject to a long term ground lease with the City of Long Beach
    (master lessor) which expires  in 2032. As of  April 30, 1996, the  building
    was  87.0% leased with  an average Adjusted Annualized  Base Rent per leased
    square foot of $19.93. According to C&W, as of April 30, 1996, the 5000 East
    Spring Peer Group  contained approximately 1,189,107  square feet of  office
    space  inventory in  nine buildings and  had weighted  average annual asking
    rental rates ranging  from $22.74 to  $26.60 per square  foot with a  direct
    vacancy  rate  of  4.6%.  Primary  tenants  at  this  Property  include  PSI
    Engineers, Inc. (13,896  square feet),  Medical Eye  Service (13,588  square
    feet),  Coast Federal Bank (11,646  square feet), Auto Insurance Specialists
    (10,583  square  feet),  Sea-Land  Service  (9,112  square  feet),   Payless
    Shoesource (9,680 square
 
                                       76
<PAGE>
    feet)  and  IDS Financial  Services  (6,387 square  feet).  Aggregate square
    footage of leases expiring in 1996, 1997 and 1998 represent 10.6%, 3.4%  and
    2.0% of the Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE DOWNTOWN LONG BEACH OFFICE SUBMARKET:
 
    100  WEST  BROADWAY.   100  West  Broadway  is a  six-story  office building
    completed in 1987 of steel frame construction with a concrete and reflective
    glass exterior. The building  was renovated in  1996. The Property  contains
    approximately  191,727 rentable  square feet and  645 parking  spaces. As of
    April 30,  1996 the  Property  was 84.4%  leased  with an  average  Adjusted
    Annualized  Base Rent per leased square foot of $20.21. According to C&W, as
    of April 30, 1996, the 100 West Broadway Peer Group contained  approximately
    1,561,223  square feet of office  space inventory in 10  buildings and had a
    weighted average annual asking  rental rates ranging  from $18.77 to  $20.32
    per square foot with a direct vacancy rate of 34.4%. Primary tenants at this
    Property include Earth Technology Corporation (50,750 square feet), Inchcape
    (26,195  square feet),  the General  Services Administration  (16,738 square
    feet) and Pacific Maritime (15,338 square feet). Aggregate square footage of
    leases expiring in 1996, 1997 and 1998  represent 1.1%, 5% and 10.5% of  the
    Property's occupied square footage, respectively.
 
PROPERTY LOCATED IN THE CERRITOS/NORWALK OFFICE SUBMARKET:
 
    12501  EAST IMPERIAL  HIGHWAY.  12501  East Imperial Highway  is a six-story
    office building completed in 1978. The  building was renovated in 1994.  The
    Property contains approximately 122,175 rentable square feet and 515 parking
    spaces.  As of April 30, 1996, the Property was 91.9% leased with an average
    Adjusted Annualized Base Rent per leased square foot of $15.85. According to
    C&W, as  of April  30, 1996,  the  12501 East  Imperial Highway  Peer  Group
    contained  approximately 1,899,992 square feet  of office space inventory in
    16 buildings and had a weighted  average annual asking rental rates  ranging
    from  $18.32 to $18.47 per square foot  with a direct vacancy rate of 18.5%.
    Primary tenants  at  this Property  include  GTE California  (63,772  square
    feet),  Mead Corporation (27,913 square feet)  and IBM (20,620 square feet).
    No leases expire in the next two years and 24.9% of the Property's  occupied
    square footage expires in 1998.
 
ORANGE COUNTY OFFICE MARKET AND PROPERTIES
 
    The  Orange County office  market contains several  distinct office markets,
including, among  others, the  West County,  Tri-Freeway Area,  Central  County,
Greater  Airport Area, South County, and  North County office markets, which are
in  turn,  composed  of  numerous  submarkets.  According  to  C&W,  there   are
approximately  52,668,350 square  feet of office  space inventory  in the Orange
County office market. As of December  31, 1995 the collective submarkets  within
the  Orange  County office  market  had a  direct  vacancy rate  of  15.5%, with
weighted average annual asking rents of $17.28 per square foot.
 
                         [Insert map of Orange County]
 
                                       77
<PAGE>
    The Orange County office market is currently in the midst of a recovery from
the recent real estate recession. Direct vacancy levels, which were in excess of
20% in 1991, have declined to 15.5%  as of December 31, 1995. The Orange  County
office  market  is  driven  by  the Greater  Airport  Area  office  market which
comprises approximately 48% of the office space inventory in Orange County.  The
Company owns two Properties in Orange County in the Huntington Beach and Anaheim
Stadium Area office submarkets that collectively contain 224,746 rentable square
feet  representing approximately 6% of the  total rentable square footage of the
Properties. Set forth below is detailed market information regarding the  Orange
County office market.
 
                                 ORANGE COUNTY
                     OFFICE MARKET AND SUBMARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                           DIRECT          NET        WTD. AVG.
                                             NUMBER          DIRECT        VACANCY      ABSORPTION     ASKING
SUBMARKET                       INVENTORY   OF BLDGS   AVAILABILITIES(1)    RATE         YTD 1995    RENTAL RATE
- ------------------------------  ----------  --------   ------------------  -------     ------------  -----------
<S>                             <C>         <C>        <C>                 <C>         <C>           <C>
WEST COUNTY...................   3,901,199     64                696,122    17.8%           (93,203)   $15.12
  Seal Beach..................     295,019      4                 17,646     6.0%             4,077    $24.96
  Westminster.................     205,700      4                 29,638    14.4%           (11,482)   $15.00
  Huntington Beach............   1,014,519     18                219,035    21.6%            21,131    $15.48
  Fountain Valley.............     549,912      9                 80,134    14.6%           (11,189)   $15.84
  Garden Grove................     893,809     12                213,168    23.8%           (54,632)   $14.28
  Los Alamitos/Stanton........     266,502      5                 85,580    32.1%           (20,233)   $12.36
  Cypress.....................     675,738     12                 50,921     7.5%           (20,875)   $17.04
TRI-FREEWAY AREA..............   9,523,392    107              2,023,109    21.2%            85,793    $16.56
  Parkcenter Area.............   2,598,284     41                444,188    17.1%            72,936    $14.40
  Anaheim Stadium Area........   2,472,409     36                414,147    16.8%           (45,422)   $15.48
  The City Area...............   2,291,191     15                627,817    27.4%             9,677    $17.16
  Main Place Area.............   2,161,508     15                536,957    24.8%            48,602    $18.36
CENTRAL COUNTY................   5,656,141    102              1,049,902    18.6%             8,065    $14.04
GREATER AIRPORT AREA..........  24,992,997    252              3,333,179    13.3%           235,485    $19.32
SOUTH COUNTY..................   4,979,988    100                595,528    12.0%            71,259    $18.12
NORTH COUNTY..................   3,614,633     54                442,671    12.2%            27,940    $16.20
                                ----------    ---             ----------   -------     ------------  -----------
    TOTAL.....................  52,668,350    679              8,140,511    15.5%           335,339    $17.28
                                ----------    ---             ----------   -------     ------------  -----------
                                ----------    ---             ----------   -------     ------------  -----------
</TABLE>
 
- --------------
Source: Cushman & Wakefield
* Does not include currently leased but available sublease space.
 
PROPERTY LOCATED IN THE HUNTINGTON BEACH OFFICE SUBMARKET:
 
    5832  BOLSA  AVENUE.   5832  Bolsa  Avenue  is a  two-story  office building
    completed in 1985  of steel  frame construction  with a  concrete and  glass
    panel  exterior. The Property contains  approximately 49,355 rentable square
    feet and 380 parking  spaces. As of  April 30, 1996,  the building was  100%
    triple  net leased to GTE California at an Adjusted Annualized Base Rent per
    leased square foot of $12.96.  According to C&W, as  of April 30, 1996,  the
    5832  Bolsa Avenue Peer Group contained approximately 860,277 square feet of
    office space  inventory in  12  buildings and  had weighted  average  annual
    asking  rental rates ranging  from $15.68 to  $16.43 per square  foot with a
    direct vacancy rate of 21.8%. The GTE California lease expires on April  30,
    2000.
 
PROPERTY LOCATED IN THE ANAHEIM STADIUM AREA OFFICE SUBMARKET:
 
    ANAHEIM  CITY  CENTRE.   Anaheim  City  Centre  is a  10-story  office tower
    completed in  1986 of  steel  reinforced concrete  construction with  a  red
    travertine  marble  and black  reflective glass  exterior. The  building was
    renovated in  1991. The  Property  contains approximately  175,391  rentable
    square feet and
 
                                       78
<PAGE>
    679  parking spaces. The parking structure is  subject to a long term ground
    lease with the City of Anaheim that  expires in 2034. As of April 30,  1996,
    the  Property was 85.5% leased with an average Adjusted Annualized Base Rent
    per leased square foot of  $15.24. According to C&W,  as of April 30,  1996,
    the  Anaheim City Centre Peer Group contained approximately 3,352,488 square
    feet of office  space inventory  in 11  buildings and  had weighted  average
    annual  asking rental  rates ranging from  $19.05 to $19.30  per square foot
    with a  direct vacancy  rate  of 11.7%.  Primary  tenants at  this  Property
    include  Intracorp (54,179  square feet),  Computer Learning  (22,042 square
    feet) and McGladrey Pullen  (18,032 square feet). No  leases expire in  1996
    and  the  aggregate  square footage  of  leases  expiring in  1997  and 1998
    represent  3.2%  and  37.6%  of  the  Property's  occupied  square  footage,
    respectively.
 
SAN DIEGO COUNTY OFFICE MARKET AND PROPERTY
 
    The   San  Diego  County  office   market  contains  eight  distinct  office
submarkets, including  South  Bay, Central  City  (which includes  Downtown  San
Diego),  East County, Mission  Valley/Kearny Mesa, La  Jolla/ Morena, North City
(which includes the University  Towne Center), the I-15  Corridor and the  North
Coast. According to C&W, there is approximately 58,325,238 square feet of office
space  inventory in the San Diego County  office market. As of December 31, 1995
the collective submarkets within the San Diego County office market had a direct
vacancy rate of 14.6%. The San Diego County office market is recovering from  an
office  market  recession, having  experienced five  straight years  of positive
absorption and increasing  occupancy, with  the direct  vacancy rate  decreasing
4.8% over this period from the 1991 direct vacancy rate of 19.4%.
 
                           [Map of San Diego County]
 
    The  two focal points of the San Diego County office market are Downtown San
Diego, which  is considered  to be  the primary  component of  the Central  City
office  submarket, and  University Towne  Center which  is the  most significant
component of the North City office  submarket. Each of the office submarkets  in
San  Diego County has developed along the path of the San Diego County's freeway
system. Each office submarket's  building type and  tenant appeal has  generally
corresponded to its proximity to Downtown San Diego and University Towne Center,
with  predominantly mid-rise  and high-rise  office buildings  within a  15 mile
radius of Downtown San Diego and low rise office buildings in business parks  in
the  outlying submarkets.  Historically, most  development moved  east and north
from these focal points. The Downtown San
 
                                       79
<PAGE>
Diego portion  of the  Central City  office submarket  is considered  to be  the
primary  office submarket in  San Diego County, with  its main competition being
the La Jolla  and North City  (University Towne Center)  office submarkets.  Set
forth  below is  detailed submarket information  regarding the  San Diego County
submarket:
 
                                SAN DIEGO COUNTY
                          OFFICE SUBMARKET STATISTICS
                              AT DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                            DIRECT
                                                                              DIRECT        VACANCY   NET ABSORPTION
SUBMARKET                                                     INVENTORY   AVAILABILITIES*    RATE        YTD 1995
- ------------------------------------------------------------  ----------  ---------------   -------   --------------
<S>                                                           <C>         <C>               <C>       <C>
SAN DIEGO MARKET
  South Bay.................................................   2,176,580       195,528        9.0%       (41,224)
  Central City (includes Downtown San Diego)................  16,059,577     2,689,327       16.7%       270,856
  East County...............................................   2,143,941       284,809       13.3%        11,990
  Mission Valley/Kearny Mesa................................  12,558,657     2,160,842       17.2%       (38,105)
  La Jolla/Morena...........................................   2,400,630       334,533       13.9%        87,849
  North City (University Towne Center)......................  12,801,915     1,584,187       12.4%        98,473
  I-15 Corridor.............................................   4,768,885       669,841       14.0%        25,512
  North Coast...............................................   5,415,053       622,373       11.5%        73,735
                                                              ----------  ---------------   -------      -------
    TOTAL...................................................  58,325,238     8,541,440       14.6%       489,086
                                                              ----------  ---------------   -------      -------
                                                              ----------  ---------------   -------      -------
</TABLE>
 
- --------------
Source: Cushman & Wakefield
* Does not include currently leased but available sublease space.
 
PROPERTY LOCATED IN THE DOWNTOWN SAN DIEGO PORTION OF THE CENTRAL CITY OFFICE
SUBMARKET:
 
    IMPERIAL BANK TOWER.   Imperial  Bank Tower  is a  24-story office  building
    completed in 1982 and renovated in 1996. As of March 31, 1996, Imperial Bank
    Tower  had a book value equal to or  greater than 10% of the total assets of
    the Company.  The Property  contains approximately  547,578 rentable  square
    feet  and 382 parking spaces in  an adjacent parking structure. The Property
    is located in downtown San Diego's financial district approximately 1/2 mile
    from Interstate 5. The building  is situated on approximately 30,056  square
    feet of land and includes a five-story atrium located on a 4,792 square foot
    parcel subject to a ground lease expiring in 2069. The Company has an option
    to purchase this parcel at fair market value. The adjacent 382-stall parking
    garage  is situated on a 24,829 square foot parcel subject to a ground lease
    expiring in 2076, which may be purchased  by the Company after 2032 at  fair
    market  value. Additional parking is provided on  a lot east of the building
    that is subject to  a ground lease  expiring in the  year 2000. The  average
    occupancy  rate of the building was 88.3%, 88.3%, 84.4%, 80.8% and 81.9% for
    the years 1991  to 1995,  respectively. The  net effective  annual rent  per
    square  foot of  the building for  the same  period, from 1991  to 1995, was
    $18.26, $15.96, $19.00,  $18.76 and  $17.72, respectively. As  of April  30,
    1996, the building was 82.0% leased with an average Adjusted Annualized Base
    Rent  per leased square  foot of $17.95.  According to C&W,  as of April 30,
    1996, the Imperial Bank Tower  Peer Group contained approximately  4,087,971
    square  feet  of office  space inventory  in 11  buildings and  had weighted
    average annual asking rental rates ranging from $18.53 to $24.89 per  square
    foot  with a direct vacancy rate of  11.9%. Primary tenants include Latham &
    Watkins (56,425  square feet),  Imperial Bank  Realty Corp.  (38,855  square
    feet),  Merrill Lynch (32,455 square feet), Deloitte & Touche (30,279 square
    feet), Arthur Anderson & Co. (18,754 square feet) and three agencies of  the
    United  States government. Latham & Watkins, a  law firm, is the only tenant
    which occupies ten  percent or more  of the rentable  square footage of  the
    building.  Pursuant to the terms of its  lease, Latham & Watkins pays annual
    base rent of approximately $1.05  million increasing to approximately  $1.33
    million  in 1999 for the remainder of  the lease term which expires in 2004.
    In addition, Latham &  Watkins has two renewal  options of five years  each,
    three  options to expand and two termination options exercisable on December
    31, 1998 and May 1, 2001,  respectively. Aggregate square footage of  leases
    expiring in 1996, 1997 and 1998 represent 4.3%, 7.2%, 6.9% of the Property's
    occupied square footage, respectively.
 
                                       80
<PAGE>
    The  following table sets forth a schedule  of lease expirations as of April
30, 1996  for Imperial  Bank Tower,  assuming no  tenants elect  to renew  their
leases  at their scheduled expirations or  elect to terminate their leases prior
to their scheduled expirations:
 
<TABLE>
<CAPTION>
                                                                                                        PERCENTAGE OF
                                          SQUARE FOOTAGE     PERCENTAGE OF     ADJUSTED ANNUALIZED   AGGREGATE PORTFOLIO
YEAR OF LEASE               NUMBER OF      OF EXPIRING    AGGREGATE PORTFOLIO     BASE RENT OF       ADJUSTED ANNUALIZED
EXPIRATION               LEASES EXPIRING      LEASES      LEASED SQUARE FEET     EXPIRING LEASES          BASE RENT
- -----------------------  ---------------  --------------  -------------------  -------------------  ---------------------
<S>                      <C>              <C>             <C>                  <C>                  <C>
1996...................             3           19,282             0.54%          $     404,772               0.61%
1997...................             5           32,492             0.91               1,088,244               1.64
1998...................             6           30,918             0.87                 509,238               0.77
1999...................             3           15,702             0.44                 253,268               0.38
2000...................             4           43,243             1.22                 714,871               1.08
2001...................             4           33,853             0.95                 505,724               0.76
2002...................             6           88,170             2.48               1,660,502               2.51
2003...................             3           20,855             0.59                 366,075               0.55
2004...................             3           78,838             2.22               1,155,094               1.74
2005...................             4           67,395             1.90               1,205,657               1.82
2008 and thereafter....             2           18,463             0.52                 201,315               0.30
                                   --
                                               -------            -----        -------------------           -----
    TOTAL..............            43          449,211            12.63%          $   8,064,759              12.17%
                                   --
                                   --
                                               -------            -----        -------------------           -----
                                               -------            -----        -------------------           -----
</TABLE>
 
C&W MARKET STUDY
    The C&W Market Study was prepared for the Company by Cushman & Wakefield  of
California,  Inc.,  which  is  a  real  estate  service  firm  with  significant
experience and expertise relating to the Southern California office markets  and
the various submarkets therein. The information in the C&W Market Study reflects
data  available  at December  31,  1995 and  does  not reflect  data  or changes
subsequent to that date  (except that C&W Peer  Group information reflects  data
available  as of April  30, 1996). The  information contained in  the C&W Market
Study has been gathered  by C&W from sources  assumed to be reliable,  including
publicly  available records. Because records of all transactions are not readily
available, the information contained in the C&W Market Study may not reflect all
transactions occurring in the geographic area discussed in the C&W Market Study.
In addition, transactions that are reported  may not be described accurately  or
completely  in the publicly available records.  C&W shall not be responsible for
and does  not warrant  the  accuracy or  completeness  of any  such  information
derived  from  such  publicly  available  records  (or  information  relating to
transactions that were not reported).
 
    In connection with the C&W Market Study, C&W made numerous assumptions  with
respect  to industry performance, general  business and economic conditions, and
other  matters.  Any  estimates   or  approximations  contained  therein   could
reasonably  be subject  to different  interpretations by  other parties. Because
predictions of future events are inherently subject to uncertainty, none of C&W,
the Company or  any other person  can assume that  such predicted rental  rates,
absorption,  or other  events will  occur as  outlined or  predicted in  the C&W
Market Study. Reported asking rental rates of properties, Replacement Cost Rents
or estimated replacement costs do not purport to necessarily reflect the  rental
rates  at  which properties  may actually  be rented,  actual rents  required to
support new development or  the actual cost of  replacement. In many  instances,
asking rents and actual rental rates differ significantly.
 
    Changes in local, national and international economic conditions will affect
the  markets  described in  the C&W  Market  Study. Therefore,  C&W can  give no
assurance that occupancy and absorption levels  and rental rates as of the  date
of  the C&W Market Study will continue  or that such occupancy levels and rental
rates will be attained at any time in the future. Forecasts of absorption rates,
rental  activity,  Replacement  Cost  Rents  and  replacement  costs  are  C&W's
estimates  as  of  the  date  of the  C&W  Market  Study.  Actual  future market
conditions may differ  materially from the  forecasts and projections  contained
therein.
 
    C&W  is a part of a national  network of affiliated companies providing real
estate services.  As  such, from  time  to time,  C&W  and its  affiliates  have
provided  and in the future may  provide real estate related services, including
brokerage and leasing agent services, to  the Company or its principals, or  may
represent the
 
                                       81
<PAGE>
Company,  its principals or others doing business with the Company. C&W received
compensation of approximately $39,000 from the Company in connection with  C&W's
preparation of the C&W Market Study.
 
COMPETITION
    The  Company may  be competing  with other  owners and  developers that have
greater resources and more experience than the Company. Additionally, the number
of competitive  properties  in any  particular  market in  which  the  Company's
Properties  are  located  could  have  a material  adverse  effect  on  both the
Company's ability  to  lease  space  at the  Properties  or  any  newly-acquired
property  and on the rents charged at  the Properties. The Company believes that
the Offering, the  Credit Facility and  its access  as a public  company to  the
capital  markets  to raise  funds during  periods  when conventional  sources of
financing may be unavailable or prohibitively expensive will provide the Company
with substantial competitive advantages. Further, the Company believes that  the
number  of real estate developers has decreased  as a result of the recessionary
market conditions and tight  credit markets during the  early 1990's as well  as
the  reluctance  on the  part  of more  conventional  financing sources  to fund
development and acquisition projects.
 
INSURANCE
    The Operating Partnership  carries comprehensive  liability, fire,  extended
coverage  and rental loss insurance covering  all of the Properties, with policy
specifications and insured limits  which the Company  believes are adequate  and
appropriate  under  the circumstances.  The  Operating Partnership  also carries
earthquake insurance on all of the Properties. There are, however, certain types
of losses that are not generally insured because they are either uninsurable  or
not  economically feasible  to insure.  Should an  uninsured loss  or a  loss in
excess of insured limits occur, the Operating Partnership could lose its capital
invested in the Property,  as well as the  anticipated future revenues from  the
Property  and,  in the  case of  debt which  is with  recourse to  the Operating
Partnership, would remain  obligated for  any mortgage debt  or other  financial
obligations  related to the  Property. Any such loss  would adversely affect the
Company. Moreover,  as  a general  partner  of the  Operating  Partnership,  the
Company  will generally  be liable  for any  unsatisfied obligations  other than
non-recourse  obligations.  The  Company   believes  that  the  Properties   are
adequately  insured. In  addition, in light  of the  California earthquake risk,
California building codes since the  early 1970's have established  construction
standards  for  all  newly  built  and  renovated  buildings,  including  office
buildings, the current and strictest construction standards having been  adopted
in  1984. Of the 24 Properties, 13 have been built since January 1, 1985 and the
Company believes that all of the Properties were constructed in full  compliance
with  the  applicable  standards existing  at  the time  of  construction. While
earthquakes have occurred in Southern California, the only loss the Company  has
experienced  as  a  result of  earthquakes  was  minor damage  to  three  of its
buildings due to the Northridge  earthquake, which resulted in an  extraordinary
loss  of $601,000 in the year ended December 31, 1994. No assurance can be given
that material  losses in  excess of  insurance proceeds  will not  occur in  the
future.
 
ENVIRONMENTAL REGULATIONS
    Under  various federal, state  and local environmental  laws, ordinances and
regulations, a  current or  previous owner  or operator  of real  estate may  be
required  to investigate and clean up hazardous or toxic substances or petroleum
product releases  at such  property and  may be  held liable  to a  governmental
entity  or  to  third parties  for  property  damage and  for  investigation and
clean-up costs incurred by  such parties in  connection with the  contamination.
Such  laws typically impose clean-up responsibility and liability without regard
to whether the owner knew of or caused the presence of the contaminants, and the
liability under such laws  has been interpreted to  be joint and several  unless
the  harm  is  divisible and  there  is  a reasonable  basis  for  allocation of
responsibility. The  costs  of investigation,  remediation  or removal  of  such
substances  may  be substantial,  and the  presence of  such substances,  or the
failure to properly remediate the contamination on such property, may  adversely
affect the owner's ability to sell or rent such property or to borrow using such
property  as collateral.  Persons who arrange  for the disposal  or treatment of
hazardous or toxic substances  at a disposal or  treatment facility also may  be
liable  for the  costs of removal  or remediation  of a release  of hazardous or
toxic substances at  such disposal or  treatment facility, whether  or not  such
facility  is owned or  operated by such person.  In addition, some environmental
laws create a lien on the contaminated
 
                                       82
<PAGE>
site in favor  of the government  for damages and  costs incurred in  connection
with  the contamination. Finally, the  owner of a site  may be subject to common
law  claims  by  third  parties  based  on  damages  and  costs  resulting  from
environmental contamination emanating from such site.
 
    Certain federal, state and local laws, regulations and ordinances govern the
removal,  encapsulation or  disturbance of ACM  when such materials  are in poor
condition or in the event of construction, remodeling, renovation or  demolition
of a building. Such laws may impose liability for release of ACM and may provide
for  third parties to seek recovery from  owners or operators of real properties
for personal injury associated  with ACM. In connection  with its ownership  and
operation  of the  Properties, the  Company may  be potentially  liable for such
costs. ACM has been detected through sampling by environmental consultants at 70
South Lake, 16000 Ventura Boulevard and  9665 Wilshire. The non-friable ACM  was
found  in certain floor tiles and pipe  wrappings at 16000 Ventura Boulevard and
70 South  Lake  and in  vinyl  floor  tiles, carpet  mastic,  drywall  mud/tape,
textured  ceiling material,  core insulation  material and  fireproofing at 9665
Wilshire. The  non-friable ACM  found at  these Properties  is not  expected  to
present a risk as long as it continues to be properly managed. The environmental
consultants  recommended no further ACM sampling or removal action at any of the
Properties.
 
    In the past two years, independent environmental consultants have  conducted
or updated Phase I Assessments at the Properties. These Phase I Assessments have
included,  among other  things, a  visual inspection  of the  Properties and the
surrounding area  and  a  review  of  relevant  state,  federal  and  historical
documents.  No invasive  techniques such  as soil  or groundwater  sampling were
performed. The environmental consultants who conducted the Phase I Assessment at
the Imperial Bank  Tower recommended  that a Phase  II study  be conducted  with
respect  to the possible presence of  an underground storage tank situated under
the Property's adjacent  parking garage,  which is  leased by  the Company.  The
Company  does not believe  that the environmental  consultant's findings support
its recommendation and, therefore, has elected  not to conduct a Phase II  study
at the Imperial Bank Tower.
 
    The  Company's Phase I  Assessments of the Properties  have not revealed any
environmental liability that the Company believes would have a material  adverse
effect  on the Company's  business, assets or  results of operations  taken as a
whole, nor is the  Company aware of any  such material environmental  liability.
Nevertheless,  it  is possible  that the  Company's Phase  I Assessments  do not
reveal all environmental  liabilities or that  there are material  environmental
liabilities of which the Company is unaware. Moreover, there can be no assurance
that  (i) future  laws, ordinances or  regulations will not  impose any material
environmental liability  or  (ii) the  current  environmental condition  of  the
Properties  will  not  be affected  by  tenants,  by the  condition  of  land or
operations  in  the  vicinity  of  the  Properties  (such  as  the  presence  of
underground storage tanks), or by third parties unrelated to the Company.
 
    The  Company believes that  the Properties are  in substantial compliance in
all material respects  with all federal,  state and local  laws, ordinances  and
regulations  regarding  hazardous  or toxic  substances  or  petroleum products,
except as noted  above. The Company  has not been  notified by any  governmental
authority,  and is not otherwise aware, of any material noncompliance, liability
or claim relating  to hazardous  or toxic  substances or  petroleum products  in
connection with any of its present Properties, other than as noted above.
 
LEGAL PROCEEDINGS
    As  a result of its acquisition of the Properties, the Company will become a
successor party-in-interest to certain legal proceedings arising in the ordinary
course of business of the Arden  Predecessors. The Company does not expect  that
these  proceedings, in the aggregate, will have a material adverse effect on the
Company.
 
EMPLOYEES
    Upon consummation  of  the  Offering and  the  Formation  Transactions,  the
Company  will employ approximately  50 persons, including  7 senior officers and
personnel in the  areas of  acquisition and business  development (3),  property
management (27), financial services (11) and legal affairs (1).
 
                                       83
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
    The Board of Directors of the Company will be expanded immediately following
consummation  of the Offering to include the director nominees named below, each
of whom has been nominated for election and consented to serve. Upon election of
the director  nominees,  there will  be  a majority  of  directors who  are  not
employees  or affiliates of the  Company. Pursuant to the  Charter, the Board of
Directors is divided into three classes  of directors. The initial terms of  the
first,   second  and  third  classes  will   expire  in  1997,  1998  and  1999,
respectively. Beginning in  1997, directors  of each  class will  be chosen  for
three-year  terms upon the expiration  of their current terms  and each year one
class of directors  will be elected  by the stockholders.  The Company  believes
that classification of the Board of Directors will help to assure the continuity
and stability of the Company's business strategies and policies as determined by
the  Board of Directors. Holders of shares of Common Stock will have no right to
cumulative voting in  the election  of directors. Consequently,  at each  annual
meeting of stockholders, the holders of a majority of the shares of Common Stock
will  be able  to elect all  of the successors  of the class  of directors whose
terms expire at that meeting.
 
    The following  table sets  forth  certain information  with respect  to  the
directors,  director nominees and executive  officers of the Company immediately
following the consummation of this Offering:
 
<TABLE>
<CAPTION>
NAME                      AGE                                   POSITION                                  TERM
- --------------------      ---      -------------------------------------------------------------------  ---------
<S>                   <C>          <C>                                                                  <C>
Richard S. Ziman              53   Chairman of the Board and Chief Executive Officer                         1999
 
Victor J. Coleman             35   President, Chief Operating Officer and Director                           1999
 
Michele Byer                  49   Chief Accounting Officer and Secretary
 
Brigitta B. Troy              54   Executive Vice President and Director of Acquisitions
 
Andrew J. Sobel               37   Executive Vice President and Director of Leasing
 
Herbert L. Porter             55   Senior Vice President and Director of Construction and Capital
                                    Improvements
 
Carl D. Covitz                57   Director Nominee                                                          1997
 
Kenneth B. Roath              60   Director Nominee                                                          1997
 
Arthur Gilbert                83   Director Nominee                                                          1998
 
Steven C. Good                54   Director Nominee                                                          1998
</TABLE>
 
    The following is a biographical summary of the experience of the  directors,
director nominees and executive officers of the Company:
 
    RICHARD  S. ZIMAN.  Mr. Ziman has served as the Chairman and Chief Executive
Officer of the Company and as a Director of the Company since its formation.  He
has  been involved in the  real estate industry for over  25 years. In 1990, Mr.
Ziman formed  Arden and  has  served as  its Chairman  of  the Board  and  Chief
Executive  Officer since its inception. In  1979 he co-founded Pacific Financial
Group, a diversified real estate  investment and development firm  headquartered
in  Beverly  Hills, of  which he  was  the Managing  General Partner.  Mr. Ziman
received his Bachelor's Degree and his  Juris Doctor Degree from the  University
of  Southern California and practiced law as a partner of the law firm of Loeb &
Loeb from 1971 to 1980, specializing  in transactional and financing aspects  of
real estate.
 
    VICTOR  J.  COLEMAN.   Mr. Coleman  has  served as  the President  and Chief
Operating Officer of  the Company and  as a  Director of the  Company since  its
formation. He is also the President, Chief Operating
 
                                       84
<PAGE>
Officer  and  co-founder of  Arden.  From 1987  to  1989, Mr.  Coleman  was Vice
President of Los Angeles  Realty Services, Inc. and  earlier in his career  from
1985 to 1987 was Director of Marketing/Investment Advisor of Development Systems
International and an associate at Drexel Burnham Lambert specializing in private
placements with institutional and individual investors. Mr. Coleman received his
Bachelor's Degree from the University of California at Berkeley and received his
Master of Business Administration from Golden Gate University.
 
    MICHELE BYER.  Ms. Byer has served as Chief Accounting Officer and Secretary
of  the Company since its formation. Ms. Byer  has 28 years of experience in the
real estate industry,  of which the  last 13  have been with  Arden and  Pacific
Financial  Group. Prior to joining Pacific  Financial Group and the Company, Ms.
Byer was  a practicing  CPA with  the  firm Kenneth  Leventhal &  Company  which
specialized  in  real  estate.  She  received  her  Bachelor's  Degree  from the
University of California at Los Angeles.
 
    BRIGITTA B.  TROY.   Ms. Troy  has served  as Executive  Vice President  and
Director of Acquisitions of the Company since its formation. She joined Arden in
1993  and was Director of Acquisitions for  Pacific Financial Group from 1982 to
1989. During  the period  from 1989  to 1993,  she was  a principal  of  Esquire
Investment  Partners, a  real estate advisory  company. A  graduate of Radcliffe
College, Ms.  Troy received  her  Juris Doctor  Degree  from the  University  of
Southern California Law School and a Master of Business Administration from UCLA
Graduate  School of  Management. Ms.  Troy has over  15 years  experience in the
commercial real estate business.
 
    ANDREW J.  SOBEL.   Mr. Sobel  has served  as Executive  Vice President  and
Director of Leasing of the Company since its formation. He joined Arden in 1992.
Mr. Sobel is an attorney admitted to the State Bar of California in 1985 with 11
years  of experience in the practice of real  estate law. From 1990 to 1992, Mr.
Sobel was a sole practitioner. From 1987 to 1990 he was an attorney with the law
firm of Pircher, Nichols & Meeks specializing in all aspects of its real  estate
transactional  practice  including  acquisitions, leasings  and  financings. Mr.
Sobel received his Bachelor's Degree from State University of New York at Oswego
and his Juris Doctor Degree from the University of California at Berkeley (Boalt
Hall).
 
    HERBERT L. PORTER.  Mr.  Porter is a Senior  Vice President and Director  of
Construction  and Capital Improvements of the  Company. He joined Arden in 1993.
Prior to joining Arden from 1973 to 1992, Mr. Porter was a partner/owner in  his
own  real  estate development  and property  management company  specializing in
medium to  high-rise  commercial office  buildings.  Mr. Porter's  23  years  in
commercial   office  development   include  planning,   financing,  acquisition,
entitlements and  approvals, design,  construction, marketing,  leasing,  tenant
improvements  and outright sale. Mr. Porter  received his Bachelor's Degree from
the University of Southern California.
 
    CARL D. COVITZ.  Mr. Covitz has agreed to serve as a member of the Board  of
Directors  of the Company commencing upon  the consummation of the Offering. For
18 of the past  23 years, Mr. Covitz  has served as the  owner and President  of
Landmark  Capital,  Inc.,  a  national real  estate  development  and investment
company involved in  the construction,  financing, ownership  and management  of
commercial,   residential,  and  warehouse  properties.   Mr.  Covitz  has  also
previously  served,  from  1990   to  1993,  as   Secretary  of  the   Business,
Transportation  & Housing  Agency of  the State of  California as  well as Under
Secretary and Chief  Operating Officer  of the  U.S. Department  of Housing  and
Urban Development from 1987 to 1989. Mr. Covitz is currently the Chairman of the
Board  of Directors of Century  Housing Corporation and is  the past Chairman of
the Board of several organizations including  the Federal Home Loan Bank of  San
Francisco  and the Los  Angeles City Housing Authority.  Mr. Covitz received his
Bachelor's Degree from the Wharton School at the University of Pennsylvania  and
his  Master  of Business  Administration from  the Columbia  University Graduate
School of Business.
 
    KENNETH B. ROATH.  Mr. Roath has agreed to serve as a member of the Board of
Directors of the Company commencing upon  the consummation of the Offering.  Mr.
Roath  is currently  Chairman, President and  Chief Executive  Officer of Health
Care Property Investors, Inc., a leader in the health care REIT industry.  Prior
to  joining Health Care Property  Investors, Inc. at its  inception in 1985, Mr.
Roath was employed for 17 years  by Pacific Holding Corporation of Los  Angeles,
the  last four of which he served  as President and Chief Operating Officer. Mr.
Roath   is    the    immediate    past   Chairman    of    NAREIT    and    also
 
                                       85
<PAGE>
serves  as a member of the Board of Governors and Executive Committee of NAREIT.
He is a director of Franchise Finance Corporation of America. Mr. Roath received
his Bachelor's Degree in accounting from San Diego State University.
 
    ARTHUR GILBERT.  Mr. Gilbert has agreed to serve as a member of the Board of
Directors of the Company commencing upon  the consummation of the Offering.  Mr.
Gilbert  has been involved in the real estate business for over 50 years and has
developed over 6 million square feet of office, industrial and retail properties
located primarily in  Southern California. He  is a Trustee  of the Los  Angeles
County  Museum of Art and an Honorary Trustee of the National Board of Directors
of American Technion Society.
 
    STEVEN C. GOOD.  Mr. Good  has agreed to serve as  a member of the Board  of
Directors  of the Company commencing upon  the consummation of the Offering. Mr.
Good is the senior partner  in the firm of Good  Swartz & Berns, an  accountancy
corporation  which evolved from  the firm of  Block, Good and  Gagerman which he
founded in 1976.  Prior to 1976,  Mr. Good was  a partner first  at Laventhol  &
Horwath, a national accounting firm, and later at Horowitz & Good. Mr. Good is a
founder  and past Chairman of CU Bancorp where he directed the bank's operations
from 1982 through 1989.  For the past seven  years he has been  a member of  the
Board of Directors of Opto Sensors, Incorporated. Mr. Good received his Bachelor
of  Science in Business Administration from  the University of California at Los
Angeles and attended UCLA's Graduate School.
 
COMMITTEES OF THE BOARD OF DIRECTORS
 
    AUDIT COMMITTEE.  Promptly following  the consummation of the Offering,  the
Board  of Directors will establish an  Audit Committee. The Audit Committee will
make  recommendations   concerning   the  engagement   of   independent   public
accountants,  review  with  the  independent public  accountants  the  scope and
results of the audit engagement,  approve professional services provided by  the
independent  public  accountants,  review the  independence  of  the independent
public accountants, consider the  range of audit and  non-audit fees and  review
the  adequacy of the Company's internal accounting controls. The Audit Committee
will initially consist of two or more non-employee directors.
 
    EXECUTIVE COMMITTEE.  Promptly following  the consummation of the  Offering,
the  Board of  Directors will establish  an Executive Committee.  Subject to the
Company's conflict of interest policies, the Executive Committee will be granted
the authority  to  acquire  and  dispose  of real  property  and  the  power  to
authorize,  on behalf of the  full Board of Directors,  the execution of certain
contracts and agreements, including those related  to the borrowing of money  by
the  Company (and,  consistent with the  Partnership Agreement  of the Operating
Partnership, to  cause the  Operating  Partnership to  take such  actions).  The
Executive Committee will include at least two non-employee directors.
 
    COMPENSATION   COMMITTEE.    Promptly  following  the  consummation  of  the
Offering, the  Board of  Directors will  establish a  Compensation Committee  to
establish  remuneration  levels  for  executive  officers  of  the  Company  and
implement the Company's Stock Incentive  Plan and any other incentive  programs.
The  Compensation Committee will  initially consist of  two or more non-employee
directors.
 
    The Board  of  Directors may  from  time  to time  establish  certain  other
committees to facilitate the management of the Company.
 
COMPENSATION OF DIRECTORS
 
    The Company intends to pay its non-employee directors annual compensation of
$18,000  for their services. In addition,  non-employee directors will receive a
fee of  $1,000  for  each  Board of  Directors  meeting  attended.  Non-employee
directors  attending any  committee meetings will  receive an  additional fee of
$1,000 for each committee meeting attended, unless the committee meeting is held
on the day of a meeting of  the Board of Directors. Non-employee directors  will
also  be  reimbursed for  reasonable expenses  incurred  to attend  director and
committee meetings. Officers of the Company  who are directors will not be  paid
any  directors' fees. Non-employee directors will receive, upon initial election
to the Board of Directors, an option  to purchase 10,000 shares of Common  Stock
which will vest over four years.
 
                                       86
<PAGE>
EXECUTIVE COMPENSATION
 
    Prior  to the  Offering, the  Company did  not pay  any compensation  to its
officers. The following table below sets forth the annual base salary rates  and
other  compensation expected to be paid in 1996 to the Company's Chief Executive
Officer and each of the Company's  five other most highly compensated  executive
officers (the "Named Executive Officers").
 
<TABLE>
<CAPTION>
                                                                                          1996 BASE     OPTIONS
NAME                                                TITLE                                SALARY RATE  ALLOCATED(1)
- --------------------  -----------------------------------------------------------------  -----------  -----------
<S>                   <C>                                                                <C>          <C>
Richard S. Ziman      Chairman of the Board and Chief Executive Officer                   $ 300,000      400,000
 
Victor J. Coleman     President, Chief Operating Officer and Director                       250,000      250,000
 
Michele Byer          Chief Accounting Officer and Secretary                                125,000       40,000
 
Herbert L. Porter     Senior Vice President and Director of Construction and Capital
                       Improvements                                                         120,000       30,000
 
Brigitta B. Troy      Executive Vice President and Director of Acquisitions                 110,000       20,000
 
Andrew J. Sobel       Executive Vice President and Director of Leasing                      110,000       40,000
</TABLE>
 
- --------------
(1) All  options will be exercisable  at a price per  share equal to the initial
    offering price per share of Common Stock offered hereby.
 
EMPLOYMENT AGREEMENTS
 
    Each of Messrs. Ziman  and Coleman will enter  into an employment  agreement
with the Company which will be effective as of the consummation of the Offering.
The employment agreements will have an initial term of five years in the case of
Mr.  Ziman and three  years in the case  of Mr. Coleman, and  will be subject to
automatic one-year extensions following the expiration of the initial term.
 
    For the first  year of the  term, the employment  agreements provide for  an
initial  annual  base compensation  in the  amounts set  forth in  the Executive
Compensation table with the amount of any initial bonus to be determined by  the
Compensation  Committee.  For  subsequent years,  both  the amount  of  the base
compensation and any bonus will be determined by the Compensation Committee.
 
    The employment  agreements  entitle the  executives  to participate  in  the
Company's  Stock Incentive Plan (each executive  will initially be allocated the
number of stock options  set forth in the  Executive Compensation table) and  to
receive  certain other insurance and pension benefits. In addition, in the event
of a termination by the Company without "cause," a termination by the  executive
for  "good reason," or  a termination pursuant  to a "change  in control" of the
Company (as such terms are defined in the employment agreements), the terminated
executive will be entitled to (i) a single severance payment equal to the sum of
the executive's  highest  annual  base compensation  and  highest  annual  bonus
received  during  the  preceding thirty-six  month  period and  (ii)  receipt of
certain severance benefits for a  period of one year  commencing on the date  of
termination.
 
    As  part of their  employment agreements, each of  Messrs. Ziman and Coleman
will be bound  by a non-competition  covenant with the  Company which  prohibits
them  from engaging in (i) the acquisition, renovation, management or leasing of
any office  properties in  the Los  Angeles, Orange  and San  Diego counties  of
Southern  California and (ii) any active  or passive investment in or reasonably
relating to  the  acquisition,  renovation,  management  or  leasing  of  office
properties  in  the  Los Angeles,  Orange  and  San Diego  counties  of Southern
California for  a period  of one  year following  the date  of such  executive's
termination.
 
STOCK INCENTIVE PLAN
 
    Prior  to the consummation of the Offering, the Company intends to adopt the
Stock Incentive  Plan for  the  purpose of  attracting and  retaining  executive
officers, directors and employees.
 
                                       87
<PAGE>
    The  Stock  Incentive Plan  will  be qualified  under  Rule 16b-3  under the
Securities Exchange Act  of 1934,  as amended  (the "Exchange  Act"). The  Stock
Incentive  Plan will be  administered by the  Compensation Committee and provide
for the granting of stock options, stock appreciation rights or restricted stock
with respect to up to 1,500,000 shares of Common Stock to executive or other key
employees of the Company. Stock options may be granted in the form of "incentive
stock options," as defined  in Section 422 of  the Code, or non-statutory  stock
options  and are exercisable for up to 10 years following the date of grant. The
exercise price  of  each option  will  be  set by  the  Compensation  Committee;
provided, however, that the price per share must be equal to or greater than the
fair market value of the Common Stock on the grant date.
 
    The   Stock  Incentive  Plan  also  provides   for  the  issuance  of  stock
appreciation rights which  will generally entitle  a holder to  receive cash  or
stock,  as determined  by the  Compensation Committee,  at the  time of exercise
equal to the difference between the exercise price and the fair market value  of
the  Common Stock. In addition, the Stock  Incentive Plan permits the Company to
issue shares of restricted stock to  executive or other key employees upon  such
terms and conditions as shall be determined by the Compensation Committee.
 
401(K) PLAN
 
    Effective  upon the  consummation of  the Offering,  the Company  intends to
establish the Arden  Realty Group  Section 401(k)  Savings/Retirement Plan  (the
"401(k)  Plan") to  cover eligible employees  of the Company  and any designated
affiliate.
 
    The 401(k) Plan will permit eligible employees of the Company to defer up to
15% of their annual compensation, subject to certain limitations imposed by  the
Code.   The   employees'   elective  deferrals   are   immediately   vested  and
non-forfeitable upon contribution to the 401(k) Plan. The Company currently does
not intend  to make  matching  contributions to  the  401(k) Plan;  however,  it
reserves  the  right  to  make matching  contributions  or  discretionary profit
sharing contributions in the future.
 
    The 401(k) Plan is designed to qualify under Section 401 of the Code so that
contributions by employees  or by  the Company to  the 401(k)  Plan, and  income
earned  on plan contributions, are not taxable to employees until withdrawn from
the 401(k) Plan,  and so  that contributions  by the  Company, if  any, will  be
deductible by the Company when made.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION
 
    The  MGCL  permits  a  Maryland  corporation to  include  in  its  charter a
provision  limiting  the  liability  of  its  directors  and  officers  to   the
corporation  and  its  stockholders  for  money  damages  except  for  liability
resulting from (a)  actual receipt of  an improper benefit  or profit in  money,
property  or services or  (b) active and deliberate  dishonesty established by a
final judgment as being  material to the cause  of action. The Charter  contains
such a provision which eliminates such liability to the maximum extent permitted
by the MGCL.
 
    The  Charter authorizes it, to the maximum extent permitted by Maryland law,
to obligate itself to indemnify and  to pay or reimburse reasonable expenses  in
advance  of  final disposition  of a  proceeding  to (a)  any present  or former
director or officer or (b) any individual  who, while a director of the  Company
and  at the request  of the Company,  serves or has  served another corporation,
partnership, joint venture, trust, employee benefit plan or any other enterprise
as a director,  officer, partner  or trustee of  such corporation,  partnership,
joint venture, trust, employee benefit plan or other enterprise from and against
any  claim or liability to which such persons  may incur by reason of his status
as a present  or former  stockholder, director or  officer of  the Company.  The
Bylaws  of the Company obligate it, to  the maximum extent permitted by Maryland
law, to indemnify  and to  pay or reimburse  reasonable expenses  in advance  of
final  disposition of  a proceeding  to (a)  any present  or former  director or
officer who is made a party to the  proceeding by reason of his service in  that
capacity  or (b) any individual who, while a  director of the Company and at the
request of the Company, serves  or has served another corporation,  partnership,
joint  venture,  trust,  employee benefit  plan  or  any other  enterprise  as a
director, officer, partner  or trustee of  such corporation, partnership,  joint
venture,  trust, employee  benefit plan  or other enterprise  and who  is made a
party to the proceeding by  reason of his service  in that capacity against  any
claim    or   liability   to   which   he   may   become   subject   by   reason
 
                                       88
<PAGE>
of such service. The Charter and the Bylaws also permit the Company to indemnify
and advance expenses to any  person who served a  predecessor of the Company  in
any  of  the capacities  described above  and to  any employee  or agent  of the
Company or a predecessor of the Company.
 
    The MGCL  requires a  corporation (unless  its charter  provides  otherwise,
which the Company's Charter does not) to indemnify a director or officer who has
been successful, on the merits or otherwise, in the defense of any proceeding to
which  he is made  a party by reason  of his service in  that capacity. The MGCL
permits a  corporation  to  indemnify  its  present  and  former  directors  and
officers,  among others,  against judgments,  penalties, fines,  settlements and
reasonable expenses actually incurred by them in connection with any  proceeding
to  which they may be made a party by  reason of their service in those or other
capacities unless it is established that (a) the act or omission of the director
or officer was material to the matter giving rise to the proceeding and (i)  was
committed  in  bad  faith  or  (ii) was  the  result  of  active  and deliberate
dishonesty, (b) the director or  officer actually received an improper  personal
benefit  in  money, property  or services  or (c)  in the  case of  any criminal
proceeding, the director or officer had reasonable cause to believe that the act
or omission was unlawful. However, a Maryland corporation may not indemnify  for
an  adverse  judgment in  a  suit by  or  in the  right  of the  corporation. In
addition, the MGCL requires the Company,  as a condition to advancing  expenses,
to obtain (a) a written affirmation by the director or officer of his good faith
belief  that he has met the standard of conduct necessary for indemnification by
the Company as authorized by the Bylaws and (b) a written statement by or on his
behalf to  repay the  amount  paid or  reimbursed by  the  Company if  it  shall
ultimately be determined that the standard of conduct was not met.
 
    The  Partnership Agreement also provides  for indemnification and advance of
expenses of  the Company  and its  officers  and directors  to the  same  extent
indemnification and advance of expenses is provided to officers and directors of
the  Company in  the Charter, and  limits the  liability of the  Company and its
officers and directors to the Operating Partnership and its partners to the same
extent liability of officers and directors of the Company to the Company and its
stockholders is  limited  under  the  Charter.  See  "Partnership  Agreement  --
Indemnification."
 
                     STRUCTURE AND FORMATION OF THE COMPANY
 
THE OPERATING ENTITIES OF THE COMPANY
 
    Following  the consummation of the  Offering and the Formation Transactions,
the operations  of  the  Company  will  be  carried  on  through  the  Operating
Partnership.  The Formation Transactions were designed to (i) enable the Company
to raise  the necessary  capital to  acquire the  Properties and  repay  certain
mortgage  debt relating thereto, (ii) provide a vehicle for future acquisitions,
(iii) enable the Company to comply  with certain requirements under the  federal
income  tax code  and regulations relating  to REITs,  (iv) facilitate potential
securitized mortgage  financings and  (v) preserve  certain tax  advantages  for
certain Arden Predecessors.
 
    THE OPERATING PARTNERSHIP
 
    Following  the  closing  of  the Offering  and  the  Formation Transactions,
substantially all of the  Company's assets will be  held by, and its  operations
conducted  through, the Operating Partnership, of  which the Company will be the
sole general partner. The Company's  interest in the Operating Partnership  will
entitle  it to share in  cash distributions from, and  in the profits and losses
of,  the  Operating  Partnership  in  proportion  to  the  Company's  percentage
ownership,  which initially will be  approximately 87.37%. Certain Participants,
including Messrs. Ziman, Coleman and Gilbert,  Ms. Byer and Arden, will own  the
remaining  OP Units. Beginning one year  after the consummation of the Offering,
any holder of OP  Units may cause  the Operating Partnership  to redeem such  OP
Units  for cash or, at  the election of the Company,  exchange such OP Units for
shares of  Common Stock  of the  Company (on  a one-for-one  basis), subject  to
certain  limitations. See "Partnership Agreement -- Redemption/Exchange Rights."
With each redemption or exchange of OP Units, the Company's percentage  interest
in the Operating Partnership will increase.
 
    As  the sole general partner of  the Operating Partnership, the Company will
generally have the exclusive power under the Partnership Agreement to manage and
conduct the business of the Operating Partnership,
 
                                       89
<PAGE>
subject  to   certain  limited   exceptions.  See   "Partnership  Agreement   --
Management."  The Board of Directors  will manage the affairs  of the Company by
directing the affairs  of the Operating  Partnership. The Operating  Partnership
cannot  be terminated (except in connection with  a sale of all or substantially
all of the  assets of the  Company or as  the result of  judicial decree or  the
redemption  of all of the OP Units held  by the limited partners) until the year
2096 without a vote  of the partners of  the Operating Partnership. For  further
information regarding the Operating Partnership, see "Partnership Agreement."
 
THE FORMATION TRANSACTIONS
 
    OWNERSHIP OF THE PROPERTIES PRIOR TO THE FORMATION TRANSACTIONS
 
    The  Arden Predecessors own 20 of the Properties directly through fee simple
interests and  hold  an  undivided  tenancy in  common  interest  in  two  other
Properties,  which are also partially owned  by unrelated third parties who will
participate in the  Formation Transactions. The  two Acquisition Properties  are
owned  by unrelated third parties  who have entered into  agreements to sell the
respective Acquisition Properties to Arden.  Each of the Arden Predecessors  was
formed  at various times over the last 3 1/2 years, generally in connection with
the initial acquisition of  a Property or  an interest in  the Property by  such
Arden  Predecessor. The Arden Predecessors, which directly own the Properties or
interests in the Properties, are comprised primarily of partnerships and limited
liability companies which are (i) managed by Messrs. Ziman and Coleman  directly
or  through affiliates of the Arden Predecessors and (ii) owned by Messrs. Ziman
and Coleman, and certain  of their relatives and  affiliates and by other  third
parties.
 
    Arden  has been engaged  in the property  management, leasing and renovation
business for over 5 years and, in connection therewith, has provided services to
22 of  the  Properties and  to  properties owned  by  third parties.  After  the
consummation  of  the Offering  and  the Formation  Transactions,  the Operating
Partnership will  continue to  carry  on the  property management,  leasing  and
renovation  business with  respect to the  Properties carried on  by Arden prior
thereto.
 
    PRE-FORMATION TRANSACTIONS
 
    - The Company filed its Charter in the state of Maryland on May 1, 1996.
 
    - The Operating  Partnership was  formed  effective May  20, 1996  with  the
      Company  as the sole general  partner and Mr. Coleman  as the sole limited
      partner.
 
    - All of the  Participants have entered  into an Option  Agreement with  the
      Company  and/or a Contribution Agreement with the Operating Partnership to
      transfer their ownership interests in  the Arden Predecessors, in  certain
      of  the Properties or, with respect to Arden, in certain of its assets, to
      the Operating Partnership in exchange for  OP Units or to the Company  for
      cash.  See  "Risk  Factors  -- Conflicts  of  Interests  in  the Formation
      Transactions and the Business of the Company."
 
    FORMATION TRANSACTIONS
 
    Concurrently with  the  consummation  of  the  Offering,  the  Company,  the
Operating  Partnership  and  the  Participants  will  engage  in  the  following
Formation Transactions.
 
    - The Company will sell shares of Common Stock in the Offering.
 
    - Pursuant to the Option Agreements, the Company will acquire for cash  from
      certain  Participants  (other  than  Messrs. Ziman  and  Coleman  who will
      receive no cash from  the Formation Transactions)  the interests owned  by
      such  Participants in certain of the  Arden Predecessors and in certain of
      the Properties. The Company will pay approximately $28.6 million from  the
      net proceeds of the Offering for such interests.
 
    - The  Company will contribute  (i) the interests  in the Arden Predecessors
      and in the Properties acquired pursuant to the Option Agreements and  (ii)
      the   net  proceeds  from   the  Offering  (after   payment  of  the  cash
      consideration to certain Participants as described above) to the Operating
      Partnership in  exchange for  a  87.37% general  partner interest  in  the
      Operating Partnership.
 
                                       90
<PAGE>
    - Pursuant   to  the  Contribution   Agreements,  the  following  additional
      contributions will be made to the Operating Partnership in exchange for OP
      Units representing limited  partners interests:  (i) certain  Participants
      will  contribute the remaining interests in  the Arden Predecessors and in
      certain of  the Properties  (  I.E., all  interests  not acquired  by  the
      Company  pursuant to the Option Agreements) and (ii) Arden will contribute
      certain of its assets, including management contracts relating to  certain
      of  the Properties  and the  contract rights  to purchase  the Acquisition
      Properties. The Participants making such contributions (including  Messrs.
      Ziman,  Coleman and  Gilbert and  Ms. Byer)  will receive  an aggregate of
      2,706,000 OP Units, with an estimated value of approximately $54.1 million
      based on the assumed initial public offering price of the Common Stock.
 
    - The Company, through the Operating Partnership, will borrow  approximately
      $104 million aggregate principal amount pursuant to the Mortgage Financing
      which  will  be  secured  by  cross-collateralized,  cross-defaulted first
      mortgage lien(s) on the Mortgage Financing Properties.
 
    - Approximately $35 million  of the  net proceeds  of the  Offering and  the
      Mortgage  Financing will be used by  the Operating Partnership to purchase
      the Acquisition Properties.
 
    - Approximately $392 million  of the net  proceeds of the  Offering and  the
      Mortgage  Financing will  be used  by the  Operating Partnership  to repay
      certain  mortgage  debt  secured   by  the  Properties  and   indebtedness
      outstanding  under  lines  of  credit  to  be  assumed  by  the  Operating
      Partnership in the Formation Transactions.
 
    - The Company, through the Operating  Partnership, will enter into the  $200
      million Credit Facility.
 
CONSEQUENCES OF THE OFFERING AND THE FORMATION TRANSACTIONS
 
    The  Offering and  the Formation Transactions  will result  in the following
consequences:
 
    - The Operating  Partnership will  directly or  indirectly own  100% of  all
      Properties by virtue of the Operating Partnership's acquisition of 100% of
      the   interests  in   the  Arden  Predecessors,   the  Property  interests
      contributed by certain Participants and the assets contributed by Arden.
 
    - The purchasers of the Common Stock offered in the Offering will own all of
      the outstanding Common Stock.
 
    - The Company will be  the sole general  partner of, and  own 87.37% of  the
      ownership interests in, the Operating Partnership.
 
    If  all limited partners of the Operating Partnership were to exchange their
OP  Units  for  Common  Stock  immediately  after  completion  of  the  Offering
(notwithstanding the provision of the Partnership Agreement which prohibits such
exchange  prior to the  first anniversary of the  consummation of the Offering),
but subject to  the Common Stock  Ownership Limit, then  the Participants  would
beneficially  own approximately 12.63% of the outstanding Common Stock (of which
6.07%, 3.10%,  2.51% and  .15% would  be beneficially  owned by  Messrs.  Ziman,
Coleman and Gilbert and Ms. Byer, respectively).
 
    See  "Risk Factors --  Conflicts of Interests  in the Formation Transactions
and  the  Business  of  the  Company;  Benefits  from  Formation  Transactions,"
"Partnership   Agreement   --   Redemption/Exchange   Rights"   and   "Principal
Stockholders."
 
DETERMINATION AND VALUATION OF OWNERSHIP INTERESTS
 
    The  Company's  percentage  interest   in  the  Operating  Partnership   was
determined   based  upon  the   percentage  of  estimated   Cash  Available  for
Distribution required to pay expected cash distributions on the shares of Common
Stock to be  issued in  the Offering resulting  in an  annual distribution  rate
equal  to 8% of the  assumed initial public offering  price of the Common Stock.
The ownership interest in the Operating Partnership allocated to the Company  is
equal  to this percentage  of estimated Cash Available  for Distribution and the
remaining  interest  in   the  Operating  Partnership   was  allocated  to   the
Participants  receiving OP Units  in the Formation  Transactions. The parameters
and assumptions used in deriving  the estimated Cash Available for  Distribution
are described under "Distributions."
 
                                       91
<PAGE>
    Based  on the issuance of 18,725,000 shares of Common Stock in the Offering,
the Company will hold a 87.37%  ownership interest in the Operating  Partnership
and  the Participants  will hold  a 12.63%  ownership interest  in the Operating
Partnership. If the Underwriters' overallotment option is exercised in full, the
Company will hold a 88.84% ownership  interest in the Operating Partnership  and
the  Participants  will  hold  a  11.16%  ownership  interest  in  the Operating
Partnership.
 
    The Company did not  obtain appraisals with respect  to the market value  of
any  of the assets that the Company  will own immediately after the consummation
of the Offering and the Formation Transactions or an opinion as to the  fairness
of  the allocation of shares to the purchasers in the Offering. The valuation of
the Company  has  been  determined  based  primarily  upon  the  estimated  Cash
Available  for  Distribution  of the  Company  and the  factors  discussed under
"Underwriting," rather than a property-by-property valuation based on historical
cost or current market value. This methodology has been used because  management
believes  it is appropriate to  value the Company as  an ongoing business rather
than with a  view to values  that could be  obtained from a  liquidation of  the
Company or of individual properties owned by the Company. See "Underwriting."
 
BENEFITS OF THE FORMATION TRANSACTIONS AND THE OFFERING TO AFFILIATES OF THE
COMPANY
 
    Certain  affiliates of the Company will realize certain material benefits in
connection with the Formation Transactions, including the following:
 
    - In  exchange  for  their  respective  ownership  interests  in  the  Arden
      Predecessors  and the assets of Arden,  Messrs. Ziman, Coleman and Gilbert
      and Ms. Byer  will become  beneficial owners of  a total  of 2,534,656  OP
      Units,  with a total value  of $50.7 million based  on the assumed initial
      public offering price of the Common Stock, which compares to a book  value
      of such interests and assets of approximately $6.7 million as of March 31,
      1996.  The Company does not believe that  the book values of the interests
      and assets exchanged  are equivalent  to the  fair market  values of  such
      interests and assets.
 
    - The  Participants will realize an immediate  accretion in the net tangible
      book value of their investment in the Company of $9.36 per share of Common
      Stock.
 
    - The Participants will  own interests  in the  Operating Partnership  which
      will  be  more liquid  after restrictions  on  transfer expire  than their
      current interests in the Arden Predecessors which own the Properties prior
      to consummation of the Formation Transactions.
 
    - Approximately $392 million of indebtedness  secured by the Properties  and
      indebtedness  outstanding  under  lines of  credit  to be  assumed  by the
      Operating Partnership will be repaid in the Formation Transactions.
 
    - Pursuant to the  Partnership Agreement, certain  Participants who hold  OP
      Units,  including Messrs.  Ziman, Coleman and  Gilbert and  Ms. Byer, will
      receive special allocations of  interest deduction of approximately  $14.5
      million  relating  to the  repayment of  mortgage debt  on certain  of the
      Properties.
 
    - Messrs. Ziman and  Coleman will  serve as  directors and  officers of  the
      Company  and  the Operating  Partnership  and will  enter  into agreements
      providing for  annual salaries,  bonuses, participation  in the  Company's
      Stock Incentive Plan and other benefits for their services.
 
    - So  long as  he is  Chief Executive Officer,  Mr. Ziman  will have certain
      participation rights in connection with  future issuances of Common  Stock
      by  the Company or OP Units by the Operating Partnership which will enable
      him to maintain his overall percentage ownership of the combined equity of
      the Company and the Operating Partnership.
 
    - Certain Participants including Messrs. Ziman, Coleman and Gilbert and  Ms.
      Byer  will have registration rights with respect to shares of Common Stock
      issued in exchange for OP Units.
 
                                       92
<PAGE>
    See "Risk Factors --  Conflicts of Interests  in the Formation  Transactions
and  the  Business  of  the  Company,"  "Dilution,"  "Partnership  Agreement  --
Redemption/Exchange Rights," "Management" and "Certain Transactions."
 
                 POLICIES WITH RESPECT TO CERTAIN TRANSACTIONS
 
    The following is  a discussion  of certain investment,  financing and  other
policies  of the Company.  These policies have been  determined by the Company's
Board of Directors and may be amended or revised from time to time by the  Board
of  Directors without a  vote of the  stockholders, except that  (i) the Company
cannot change its policy of holding its assets and conducting its business  only
through  the Operating Partnership and its affiliates without the consent of the
holders of OP Units as provided  in the Partnership Agreement, and (ii)  changes
in  certain policies  with respect to  conflicts of interest  must be consistent
with legal requirements.
 
INVESTMENT POLICIES
 
    The Company  will  conduct all  of  its investment  activities  through  the
Operating  Partnership and  its affiliates. The  Company's investment objectives
are to  provide  quarterly  cash distributions  and  achieve  long-term  capital
appreciation  through increases in the value of the Company. For a discussion of
the Properties and the Company's acquisition and other strategic objectives, see
"Business and Properties" and "Business and Growth Strategies."
 
    The Company  may purchase  or lease  income-producing commercial  and  other
types of properties for long-term investment, expand and improve the real estate
presently  owned  or  other  properties  purchased,  or  sell  such  real estate
properties, in whole  or in part,  when circumstances warrant.  The Company  may
also  participate  with  third  parties  in  property  ownership,  through joint
ventures or other types of co-ownership. Such investments may permit the Company
to own interests  in larger  assets without  unduly restricting  diversification
and,  therefore, add flexibility in structuring  its portfolio. The Company will
not enter into a joint venture or  partnership to make an investment that  would
not otherwise meet its investment policies. Equity investments may be subject to
existing  mortgage  financing  and  other  indebtedness  or  such  financing  or
indebtedness as  may be  incurred in  connection with  acquiring or  refinancing
these  investments. Debt service  on such financing or  indebtedness will have a
priority over any distributions with respect to the Common Stock.
 
    While the  Company's  current  portfolio  consists  of,  and  the  Company's
business objectives emphasize, equity investments in commercial real estate, the
Company  may, in the discretion of the Board of Directors, invest in other types
of  equity  real  estate  investments,  mortgages  (including  participating  or
convertible  mortgages) and other  real estate interests.  The Company currently
intends to invest in  or develop commercial  properties in Southern  California,
and  primarily in  suburban Los Angeles  County. However,  future development or
investment activities will not be limited to any geographic area or product type
or to a specified percentage of the Company's assets. While the Company  intends
to  diversify in terms of property locations,  size and market, the Company does
not have  any limit  on the  amount  or percentage  of its  assets that  may  be
invested in any one property or any one market area.
 
    Subject  to the percentage  of ownership limitations  and gross income tests
necessary for REIT qualification, the Company  also may invest in securities  of
other  REITs, other entities engaged in  real estate activities or securities of
other issuers,  including  for  the  purpose of  exercising  control  over  such
entities. Investments are also subject to the Company's policy not to be treated
as  an investment company under  the Investment Company Act  of 1940, as amended
(the "1940 Act").
 
DISPOSITIONS
 
    The Company does not currently intend  to dispose of any of the  Properties,
although  it reserves the  right to do  so if, based  upon management's periodic
review of the Company's portfolio, the  Board of Directors determines that  such
action  would be  in the  best interests  of the  Company. The  tax consequences
 
                                       93
<PAGE>
of the disposition  of the Properties  may, however, influence  the decision  of
certain  directors and executive officers of the Company who hold OP Units as to
the desirability of a  proposed disposition. See "Risk  Factors -- Conflicts  of
Interests in the Formation Transactions and the Business of the Company."
 
    Any  decision  to dispose  of a  Property will  be made  by the  Company and
approved by  a  majority of  the  Board of  Directors.  In addition,  under  the
Partnership  Agreement, the consent of a majority of the Limited Partners of the
Operating Partnership must approve any sale  or disposition of the Century  Park
Center Property for a period of seven years from the closing of the Offering.
 
FINANCING POLICIES
 
    As  a general  policy, the Company  intends to limit  its total consolidated
indebtedness incurred so  that at the  time any debt  is incurred, the  Company'
debt  to total market capitalization ratio  does not exceed 50%. Upon completion
of the  Offering  and the  Formation  Transactions,  the debt  to  total  market
capitalization  ratio of the  Company will be approximately  19.5% (17.8% if the
Underwriters' overallotment option is exercised in full). The Charter and Bylaws
do not, however, limit the amount or percentage of indebtedness that the Company
may incur. In addition, the Company may from time to time modify its debt policy
in light  of current  economic conditions,  relative costs  of debt  and  equity
capital,  market values of its Properties,  general conditions in the market for
debt and  equity securities,  fluctuations in  the market  price of  its  Common
Stock,  growth and acquisition opportunities and other factors. Accordingly, the
Company may increase or decrease its  debt to total market capitalization  ratio
beyond  the limits described above. If  these policies were changed, the Company
could become more highly leveraged, resulting in an increased risk of default on
its obligations and a related increase  in debt service requirements that  could
adversely  affect  the  financial condition  and  results of  operations  of the
Company and the Company's ability to make distributions to stockholders.
 
                                       94
<PAGE>
    The  Company has  established its debt  policy relative to  the total market
capitalization of the Company computed at the time the debt is incurred,  rather
than  relative to  the book  value of  such assets,  a ratio  that is frequently
employed, because it  believes that the  book value  of its assets  (which to  a
large  extent is the  depreciated value of real  property, the Company's primary
tangible asset) does not  accurately reflect its ability  to borrow and to  meet
debt  service requirements. Total market  capitalization, however, is subject to
greater fluctuation than book value, and  does not necessarily reflect the  fair
market value of the underlying assets of the Company at all times. Moreover, due
to fluctuations in the value of the Company's portfolio of Properties over time,
and  since any measurement  of the Company's  total consolidated indebtedness to
total market capitalization is made only at the time debt is incurred, the  debt
to total market capitalization ratio could exceed the 50% level.
 
    The  Company  has not  established  any limit  on  the number  or  amount of
mortgages that may be  placed on any  single property or on  its portfolio as  a
whole.
 
    Although   the  Company  will  consider  factors  other  than  total  market
capitalization in making decisions regarding the incurrence of debt (such as the
purchase price of properties to be  acquired with debt financing, the  estimated
market  value  of properties  upon refinancing,  and  the ability  of particular
properties and the Company as a whole to generate sufficient cash flow to  cover
expected  debt service), there can be no assurance that the debt to total market
capitalization ratio, or any other measure of asset value, at the time the  debt
is incurred or at any other time will be consistent with any particular level of
distributions to stockholders. See "Risk Factors -- No Limitations on Debt."
 
    MORTGAGE  FINANCING.   The Company is  finalizing a seven-year  term loan of
$104 million which will  close concurrently with the  Offering. The proceeds  of
the  Mortgage Financing, together with proceeds  from the Offering, will be used
primarily  to  refinance  the  Company's  existing  mortgage  indebtedness.  The
Mortgage   Financing   will  be   non-recourse,   secured  primarily   by  fully
cross-collateralized and  cross-defaulted  first  mortgage  lien(s)  on  the  10
Mortgage  Financing  Properties.  The Mortgage  Financing  will  require monthly
payments of interest only, with all principal due on the seventh anniversary  of
the closing of the Mortgage Financing. The Mortgage Financing will bear interest
at a fixed rate of 7.95% per annum based on current interest rates.
 
    THE  CREDIT FACILITY.   The Company  is finalizing a  two-year, $200 million
revolving Credit Facility with a one year extension. The Credit Facility will be
used, among  other things,  to finance  acquisition of  properties, and  to  the
extent required, for working capital purposes, which may include providing funds
for tenant improvements and capital expenditures.
 
    The  Credit Facility will be subject  to customary conditions, including the
payment of the commitment and maintenance fees, an initial minimum net operating
income, an initial loan-to-value ratio  not exceeding 65% and the  establishment
of  a replacement reserve for capital expenditures, and will give the lender the
right to approve the Properties securing the Credit Facility.
 
CONFLICT OF INTEREST POLICIES
 
    The Company has adopted  certain policies and  entered into agreements  with
Messrs.  Ziman and Coleman designed to eliminate or minimize potential conflicts
of interest. These agreements include non-competition provisions that  generally
prohibit Messrs. Ziman and Coleman from engaging in the acquisition, management,
leasing  or renovation of any  office properties in the  Los Angeles, Orange and
San Diego counties  of Southern California  and from engaging  in any active  or
passive  investment in  or reasonably  relating to  the acquisition, renovation,
management or leasing of  any office properties in  the Los Angeles, Orange  and
San Diego counties of Southern California for a period of one year following the
date   of  termination  of  such  executive's  employment.  See  "Management  --
Employment Agreements." The Company's Board  of Directors is subject to  certain
provisions  of Maryland law, which are designed to eliminate or minimize certain
potential conflicts of interest. However, there  can be no assurance that  these
policies  always  will  be  successful  in  eliminating  the  influence  of such
conflicts, and if they  are not successful, decisions  could be made that  might
fail to reflect fully the interests of all stockholders.
 
    POLICIES  APPLICABLE TO  ALL DIRECTORS.   The  Company has  adopted a policy
that, without the approval of a majority of the non-employee directors, it  will
not   (i)  acquire   from  or  sell   to  any  director,   officer  or  employee
 
                                       95
<PAGE>
of the Company, or any  entity in which a director,  officer or employee of  the
Company  beneficially owns more than  a 1% interest, or  acquire from or sell to
any affiliate of any of  the foregoing, any of the  assets or other property  of
the  Company, (ii) make any loan to or  borrow from any of the foregoing persons
or (iii) engage in any other transaction with any of the foregoing persons.
 
    Pursuant to Maryland law, each director  will be subject to restrictions  on
misappropriation  of corporate opportunities. In addition, under Maryland law, a
contract or other transaction between the Company and a Director or between  the
Company  and any  other corporation  or other  entity in  which a  Director is a
director or has a material financial interest is not void or voidable solely  on
the  grounds of such  interest, the presence  of the Director  at the meeting at
which the contract or  transaction is approved or  the Director's vote in  favor
thereof  if  (a) the  transaction  or contract  is  approved or  ratified, after
disclosure of the common directorship or interest, by the affirmative vote of  a
majority  of  disinterested  directors,  even  if  the  disinterested  directors
constitute less  than  a  quorum,  or  by  a  majority  of  the  votes  cast  by
disinterested  stockholders,  or (b)  the transaction  or  contract is  fair and
reasonable to the Company.
 
POLICIES WITH RESPECT TO OTHER ACTIVITIES
 
    The Company has authority to offer Common Stock, Preferred Stock or  options
to  purchase  stock in  exchange  for property  and  to repurchase  or otherwise
acquire its Common Stock or other securities in the open market or otherwise and
may engage in such activities in the future. As described under "The Partnership
Agreement --  Redemption/Exchange  Rights,"  the Company  expects  (but  is  not
obligated)  to  issue Common  Stock  to holders  of  OP Units  in  the Operating
Partnership upon  exercise  of  their redemption/  exchange  rights.  Except  in
connection  with the Formation  Transactions, the Company  has not issued Common
Stock, OP Units or any  other securities in exchange  for property or any  other
purpose,  and the  Board of  Directors has no  present intention  of causing the
Company to repurchase any  Common Stock. The Company  may issue Preferred  Stock
from  time  to time,  in  one or  more  series, as  authorized  by the  Board of
Directors without  the need  for  stockholder approval.  See "Capital  Stock  --
Preferred Stock." The Company has not engaged in trading, underwriting or agency
distribution  or sale  of securities of  other issuers other  than the Operating
Partnership, nor has  the Company invested  in the securities  of other  issuers
other than the Operating Partnership for the purposes of exercising control, and
does  not intend to do so. At all times, the Company intends to make investments
in such a manner  as to qualify  as a REIT, unless  because of circumstances  or
changes  in  the Code  (or  the Treasury  Regulations),  the Board  of Directors
determines that it is no longer in  the best interest of the Company to  qualify
as  a REIT. The Company has not made any loans to third parties, although it may
in the future  make loans to  third parties, including,  without limitation,  to
joint ventures in which it participates. The Company intends to make investments
in  such a way  that it will not  be treated as an  investment company under the
1940 Act. The Company's policies with respect to such activities may be reviewed
and modified or amended from  time to time by  the Company's Board of  Directors
without a vote of the stockholders.
 
                              CERTAIN TRANSACTIONS
 
FORMATION TRANSACTIONS
 
    The terms of the acquisitions of interests in the Properties and in Arden by
the  Operating  Partnership are  described in  "Structure  and Formation  of the
Company -- The Formation Transactions."
 
PARTNERSHIP AGREEMENT; REDEMPTION/EXCHANGE RIGHTS
 
    The Company will enter into the Partnership Agreement with the  Participants
receiving  OP Units. Among other things, the Partnership Agreement provides such
holders of OP Units with the right to cause the Operating Partnership to  redeem
OP Units for cash or, at the election of the Company, exchange such OP Units for
shares  of  Common Stock  of the  Company  (on a  one-for-one basis).  See "Risk
Factors -- Conflicts of Interests in the Formation Transactions and the Business
of the Company; Benefits from Formation Transactions," "Policies With Respect to
Certain  Transactions  --  Conflict  of  Interest  Policies"  and   "Partnership
Agreement -- Redemption/Exchange Rights."
 
REGISTRATION RIGHTS
 
    For  a description of certain registration  rights held by the Participants,
see "Shares Available for Future Sale -- Registration Rights."
 
                                       96
<PAGE>
                             PARTNERSHIP AGREEMENT
 
    THE  FOLLOWING  SUMMARY   OF  THE  PARTNERSHIP   AGREEMENT,  INCLUDING   THE
DESCRIPTIONS  OF CERTAIN PROVISIONS  SET FORTH ELSEWHERE  IN THIS PROSPECTUS, IS
QUALIFIED IN ITS ENTIRETY  BY REFERENCE TO THE  PARTNERSHIP AGREEMENT, WHICH  IS
FILED  AS AN EXHIBIT TO THE REGISTRATION STATEMENT OF WHICH THIS PROSPECTUS IS A
PART.
 
MANAGEMENT
 
    The  Operating  Partnership  has  been  organized  as  a  Maryland   limited
partnership  pursuant  to the  terms  of the  Partnership  Agreement. Generally,
pursuant to the Partnership Agreement, the Company, as the sole general  partner
of   the  Operating  Partnership,   will  have  full,   exclusive  and  complete
responsibility and discretion  in the  management and control  of the  Operating
Partnership,  subject to certain limited exceptions. The limited partners of the
Operating Partnership (the "Limited  Partners") will have  no authority in  such
capacity  to transact business for, or  participate in the management activities
or decisions  of,  the  Operating  Partnership. Any  decision  to  sell  all  or
substantially  all of the  assets of the  Operating Partnership, to  merge or to
dissolve or, within seven years following  the closing of the Offering, to  sell
or  dispose of the Century Park Center Property would require the consent of the
holders of 50% of the OP Units representing limited partner interests.
 
TRANSFERABILITY OF INTERESTS
 
    The Partnership  Agreement provides  that the  Company may  not  voluntarily
withdraw  from the Operating Partnership, or  transfer or assign its interest in
the Operating Partnership, without the consent of  the holders of 60% of the  OP
Units  representing  limited  partner  interests.  Pursuant  to  the Partnership
Agreement, the  Limited Partners  have  agreed not  to transfer,  assign,  sell,
encumber  or otherwise  dispose of,  without the  consent of  the Company, their
interest in the Operating Partnership, other  than to Affiliates (as defined  in
the Partnership Agreement) who agree to assume the obligations of the transferor
under  the Partnership  Agreement. Messrs. Ziman  and Coleman  and certain other
Participants are subject to additional restrictions on their ability to transfer
shares of Common Stock. See "Underwriting."
 
CAPITAL CONTRIBUTIONS
 
    If the Operating Partnership requires additional  funds at any time or  from
time  to time  in excess  of funds available  to the  Operating Partnership from
borrowings or capital contributions, and the  Company borrows such funds from  a
financial  institution or other lender then the  Company will lend such funds to
the Operating Partnership on comparable  terms and conditions as are  applicable
to  the Company's borrowing of such funds. The Company may contribute the amount
of any required funds not loaned  to the Operating Partnership as an  additional
capital contribution to the Operating Partnership. If the Company so contributes
additional  capital  to  the Operating  Partnership,  the  Company's partnership
interest in the Operating Partnership will be increased on a proportionate basis
based upon the amount of such additional capital contributions and the value  of
the  Operating Partnership  at the time  of such  contributions. Conversely, the
partnership  interests  of  the  Limited   Partners  will  be  decreased  on   a
proportionate  basis in  the event  of additional  capital contributions  by the
Company. The Company's rights to make loans or additional capital  contributions
to  the  Operating Partnership  are generally  subject to  Mr. Ziman's  right to
receive notice thereof and  to fund the  loan or capital  contribution on a  pro
rata basis so long as Mr. Ziman is the Company's Chief Executive Officer.
 
REDEMPTION/EXCHANGE RIGHTS
 
    Limited  Partners will receive rights which  will enable them to require the
Operating Partnership to redeem part  or all of their  OP Units for cash  (based
upon  the fair market value of an equivalent number of shares of Common Stock at
the time of such redemption) or, at  the election of the Company, exchange  such
OP  Units  for  shares of  Common  Stock  (on a  one-for-one  basis,  subject to
adjustment in the event  of stock splits, stock  dividends, issuance of  certain
rights,  certain  extraordinary  distributions  and  similar  events)  from  the
Company, subject to  the Ownership Limit  and certain limitations  on resale  of
shares.  The Company  presently anticipates that  it will elect  to issue Common
Stock in exchange for OP Units in connection with each such redemption  request,
rather than having the Operating Partnership pay cash. With each such redemption
or  exchange,  the  Company's  percentage ownership  interest  in  the Operating
Partnership will increase.  This redemption/exchange right  may be exercised  by
Limited  Partners  from  time to  time,  in whole  or  in part,  subject  to the
limitations that such right may not be exercised (i) prior to the expiration  of
one year
 
                                       97
<PAGE>
following  the consummation of  the Offering or  (ii) at any  time to the extent
such exercise would result  in such Limited  Partner actually or  constructively
owning  common stock  in excess  of the  Common Stock  Ownership Limit, assuming
Common Stock was issued in such exchange.
 
ISSUANCE OF ADDITIONAL OP UNITS/COMMON STOCK
 
    As general partner of the Operating Partnership, the Company has the ability
to cause the Operating  Partnership to issue additional  OP Units. In  addition,
the  Company may, from time to time, issue additional shares of Common Stock. In
either event,  Mr. Ziman  will have  the  right, so  long as  he serves  as  the
Company's  Chief Executive  Officer, to  purchase OP  Units at  a purchase price
equal to the purchase price in the transaction giving rise to such participation
rights and to the extent necessary  to maintain his overall percentage  interest
in the Company, assuming the exchange of all OP Units for Common Stock.
 
TAX MATTERS
 
    Pursuant  to the Partnership Agreement, the  Company will be the tax matters
partner of the Operating Partnership and,  as such, will have authority to  make
tax elections under the Code on behalf of the Operating Partnership.
 
    The  net income or net  loss of the Operating  Partnership will generally be
allocated to  the Company  and the  Limited Partners  in accordance  with  their
respective percentage interests in the Operating Partnership, subject to special
allocations  to certain Limited Partners of  interest deductions and income from
the discharge  of  indebtedness  attributable  to  loans  transferred  by  Arden
Predecessors  to the Operating Partnership and to compliance with the provisions
of Sections  704(b) and  704(c)  of the  Code  and the  regulations  promulgated
thereunder.  See  "Federal  Income  Tax Considerations  --  Tax  Aspects  of the
Operating Partnership."
 
OPERATIONS
 
    The  Partnership  Agreement  requires  that  the  Operating  Partnership  be
operated  in a manner that  will enable the Company  to satisfy the requirements
for being classified as a REIT and to avoid any federal income tax liability.
 
    The Partnership Agreement provides that  the net operating cash revenues  of
the  Operating Partnership, as  well as the net  sales and refinancing proceeds,
will be distributed from time to time (but at least quarterly) as determined  by
the Company pro rata in accordance with the partners' percentage interests.
 
    Pursuant  to the Partnership  Agreement, subject to  certain exceptions, the
Operating Partnership  will also  assume  and pay  when  due, or  reimburse  the
Company  for payment of all costs and expenses relating to the operations of the
Company.
 
DUTIES AND CONFLICTS
 
    The Partnership  Agreement  provides that  all  business activities  of  the
Company, including all activities pertaining to the acquisition and operation of
office properties, must be conducted through the Operating Partnership.
 
TERM
 
    The  Operating  Partnership will  continue in  full  force and  effect until
December 31, 2096, or until  sooner dissolved upon the bankruptcy,  dissolution,
withdrawal or termination of the Company (unless the Limited Partners other than
the  Company elect to  continue the Operating Partnership),  the election of the
Company and the Limited Partners, on entry of decree of judicial dissolution, or
the sale or  other disposition of  all or  substantially all the  assets of  the
Operating Partnership or redemption of all OP Units.
 
INDEMNIFICATION
 
    To  the  extent permitted  by law,  the  Partnership Agreement  provides for
indemnification and advance  of expenses  of the  Company and  its officers  and
directors to the same extent indemnification and advance of expenses is provided
to  officers  and  directors of  the  Company  in its  Charter,  and  limits the
liability of  the  Company and  its  officers  and directors  to  the  Operating
Partnership  and  its partners  to  the same  extent  liability of  officers and
directors of  the Company  is  limited under  the  Charter. See  "Management  --
Limitation of Liability and Indemnification."
 
                                       98
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The  following table sets forth certain information regarding the beneficial
ownership of Common Stock (or Common Stock for which OP Units are  exchangeable)
by  each  director  and  director  nominee,  by  each  Named  Executive  Officer
identified on  the  table on  page  87,  by all  directors  (including  director
nominees)  and officers  of the  Company as a  group and  by each  person who is
expected to be the beneficial owner of  5% or more of the outstanding shares  of
Common  Stock immediately  following the completion  of the  Offering. Except as
indicated below, all of such Common  Stock is owned directly, and the  indicated
person has sole voting and investment power.
 
<TABLE>
<CAPTION>
                                                                        NUMBER OF SHARES OF  PERCENTAGE OF COMMON
NAME AND ADDRESS(1)                                                       COMMON STOCK(2)    STOCK OUTSTANDING(2)
- ----------------------------------------------------------------------  -------------------  ---------------------
<S>                                                                     <C>                  <C>
Richard S. Ziman                                                              1,300,747                 6.1%
 
Victor J. Coleman                                                               665,536                 3.1%
 
Michele Byer                                                                     31,427                    *
 
Brigitta B. Troy                                                                --                    --
 
Andrew J. Sobel                                                                 --                    --
 
Herbert L. Porter                                                               --                    --
 
Arthur Gilbert                                                                  536,946                 2.5%
 
Carl D. Covitz                                                                  --                    --
 
Kenneth B. Roath                                                                --                    --
 
Steven C. Good                                                                  --                    --
 
All directors and officers as a group (seven persons)                         2,534,656                11.8%
</TABLE>
 
- --------------
* Less than one percent.
 
(1)  Unless otherwise noted, the address for  each of the persons listed is 9100
    Wilshire Boulevard, East Tower, Suite 700, Beverly Hills, California 90212.
 
(2) Assumes that  all OP Units  held by the  person are redeemed  for shares  of
    Common  Stock  and that  none  of the  OP Units  held  by other  persons are
    redeemed for shares of Common Stock.  See "Capital Stock -- Restrictions  on
    Transfer."
 
                                       99
<PAGE>
                                 CAPITAL STOCK
 
    The  following summary  of the terms  of the  stock of the  Company does not
purport to  be complete  and is  subject to  and qualified  in its  entirety  by
reference to the Company's Charter and the Company's Bylaws, copies of which are
exhibits  to the Registration Statement of which  this Prospectus is a part. See
"Additional Information."
 
GENERAL
 
    The Charter provides that the Company may issue up to 100,000,000 shares  of
Common  Stock and 20,000,000 shares of preferred stock, $.01 par value per share
("Preferred Stock").  Upon  completion of  the  Offering, 18,725,000  shares  of
Common  Stock will be  issued and outstanding  and no shares  of Preferred Stock
will be issued and outstanding.  Under Maryland law, stockholders generally  are
not  liable for the corporation's obligations solely as a result of their status
as stockholders.
 
COMMON STOCK
 
    All shares of  Common Stock offered  hereby will be  duly authorized,  fully
paid  and nonassessable. Subject to the  preferential rights of any other shares
or series  of  stock  and  to  the  provisions  of  the  Charter  regarding  the
restrictions  on  transfer  of stock,  holders  of  shares of  Common  Stock are
entitled to  receive dividends  on such  stock if,  as and  when authorized  and
declared  by  the  Board of  Directors  of  the Company  out  of  assets legally
available therefor and  to share ratably  in the assets  of the Company  legally
available  for distribution to its stockholders in the event of its liquidation,
dissolution or winding up after payment  of or adequate provision for all  known
debts and liabilities of the Company.
 
    Subject  to  the provisions  of the  Charter  regarding the  restrictions on
transfer of stock, each outstanding share of Common Stock entitles the holder to
one vote  on all  matters submitted  to a  vote of  stockholders, including  the
election of directors and, except as provided with respect to any other class or
series  of stock, the holders  of such shares will  possess the exclusive voting
power. There is no cumulative voting  in the election of directors, which  means
that  the holders of  a majority of  the outstanding shares  of Common Stock can
elect all of the  directors then standing  for election and  the holders of  the
remaining shares will not be able to elect any directors.
 
    Holders  of shares of Common Stock have no preference, conversion, exchange,
sinking fund, redemption or  appraisal rights and have  no preemptive rights  to
subscribe  for any securities of  the Company. Subject to  the provisions of the
Charter regarding the restrictions on transfer of stock, shares of Common  Stock
will have equal dividend, liquidation and other rights.
 
    Under  the MGCL, a corporation generally cannot dissolve, amend its charter,
merge, sell all or substantially all of  its assets, engage in a share  exchange
or engage in similar transactions outside the ordinary course of business unless
approved  by the affirmative vote of stockholders holding at least two-thirds of
the votes  entitled  to  be cast  on  the  matter unless  a  greater  or  lesser
percentage  (but not less than a majority of all  of the votes to be cast on the
matter) is set forth  in the corporation's charter.  The Company's Charter  does
not provide for a lesser percentage in such situations.
 
PREFERRED STOCK
 
    The  Charter  authorizes the  Board of  Directors  to classify  any unissued
shares of  Preferred  Stock and  to  reclassify any  previously  classified  but
unissued shares of any series, as authorized by the Board of Directors. Prior to
issuance  of shares of  each series, the Board  is required by  the MGCL and the
Charter of  the  Company  to set,  subject  to  the provisions  of  the  Charter
regarding  the  restrictions  on  transfer  of  stock,  the  terms, preferences,
conversion or  other  rights, voting  powers,  restrictions, limitations  as  to
dividends  or  other distributions,  qualifications and  terms or  conditions of
redemption for each such series. Thus, the Board could authorize the issuance of
shares of Preferred Stock with terms and conditions which could have the  effect
of delaying, deferring or preventing a transaction or a change in control of the
Company  that  might involve  a premium  price  for holders  of Common  Stock or
otherwise be  in their  best  interest. As  of the  date  hereof, no  shares  of
Preferred  Stock are outstanding and  the Company has no  present plans to issue
any Preferred Stock.
 
                                      100
<PAGE>
POWER TO ISSUE ADDITIONAL SHARES OF COMMON STOCK AND PREFERRED STOCK
 
    The Company  believes that  the power  of the  Board of  Directors to  issue
additional authorized but unissued shares of Common Stock or Preferred Stock and
to  classify or reclassify unissued shares  of Preferred Stock and thereafter to
cause the Company to issue such classified or reclassified shares of stock  will
provide  the Company with  increased flexibility in  structuring possible future
financings and acquisitions and  in meeting other needs  which might arise.  The
additional classes or series, as well as the Common Stock, will be available for
issuance  without  further action  by  the Company's  stockholders,  unless such
action is required  by applicable  law or  the rules  of any  stock exchange  or
automated  quotation system on  which the Company's securities  may be listed or
traded. Although the Board of Directors has no intention at the present time  of
doing  so, it could authorize the Company to issue a class or series that could,
depending upon the  terms of such  class or  series, delay, defer  or prevent  a
transaction  or a change in control of  the Company that might involve a premium
price for holders of Common Stock or otherwise be in their best interest.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer agent and registrar for the Common Stock is                   .
 
RESTRICTIONS ON TRANSFER
 
    For the Company to  qualify as a REIT  under the Code, no  more than 50%  in
value   of  its  outstanding   shares  of  stock  may   be  owned,  actually  or
constructively, by five or fewer individuals (as defined in the Code to  include
certain  entities) during the last half of  a taxable year (other than the first
year for which an election to be treated as a REIT has been made). In  addition,
if  the  Company,  or an  owner  of 10%  or  more  of the  Company,  actually or
constructively owns 10% or more of a tenant  of the Company (or a tenant of  any
partnership in which the Company is a partner), the rent received by the Company
(either  directly or through any such partnership)  from such tenant will not be
qualifying income for purposes  of the REIT  gross income tests  of the Code.  A
REIT's  stock must also be  beneficially owned by 100  or more persons during at
least 335 days of a taxable year of twelve months or during a proportionate part
of a shorter taxable year (other than the first year for which an election to be
treated as a REIT has been made).
 
    Because the  Company expects  to qualify  as a  REIT, the  Charter  contains
restrictions on the ownership and transfer of Common Stock which are intended to
assist  the Company in complying with  theses requirements. The Charter provides
that, subject to certain specified exceptions,  no person or entity may own,  or
be  deemed to own by virtue  of the applicable constructive ownership provisions
of the Code, more than 9.0% (by number or value, whichever is more  restrictive)
of  the  outstanding  shares  of  Common  Stock  (the  "Ownership  Limit").  The
constructive ownership rules are complex, and  may cause shares of Common  Stock
owned  actually  or  constructively by  a  group of  related  individuals and/or
entities to be owned  constructively by one individual  or entity. As a  result,
the  acquisition  of  less than  9.0%  of the  shares  of Common  Stock  (or the
acquisition of an interest in an  entity that owns, actually or  constructively,
Common  Stock)  by  an  individual or  entity,  could,  nevertheless  cause that
individual or entity, or another individual or entity, to own constructively  in
excess  of 9.0% of the outstanding Common  Stock and thus subject such shares to
the Ownership  Limit. The  Board  of Directors  may, but  in  no event  will  be
required  to, waive the Ownership Limit with respect to a particular stockholder
if it determines that such ownership will not jeopardize the Company's status as
a REIT.  As a  condition of  such waiver,  the Board  of Directors  may  require
opinions  of counsel satisfactory  to it and/or  undertakings or representations
from the applicant with  respect to preserving the  REIT status of the  Company.
The  Board of Directors has obtained  such undertakings and representations from
Mr. Ziman and, as a result, has  waived the Ownership Limit with respect to  the
Ziman   family  and   certain  affiliated  entities,   including  the  Operating
Partnership. The  Ziman family  and  such entities  will  be permitted  to  own,
actually  or constructively,  up to  13% by number  or value,  whichever is more
restrictive, of the Common Stock.
 
    The Charter further prohibits (a) any person from actually or constructively
owning shares of stock  of the Company  that would result  in the Company  being
"closely  held" under Section 856(h) of the  Code or otherwise cause the Company
to fail to  qualify as a  REIT and (b)  any person from  transferring shares  of
stock  of the Company  if such transfer would  result in shares  of stock of the
Company being  owned by  fewer than  100  persons. Any  person who  acquires  or
attempts or intends to acquire actual or constructive
 
                                      101
<PAGE>
ownership  of shares of stock of the Company that will or may violate any of the
foregoing restrictions  on transferability  and ownership  is required  to  give
notice  immediately  to the  Company  and provide  the  Company with  such other
information as the Company may request in order to determine the effect of  such
transfer  on  the Company's  status  as a  REIT.  The foregoing  restrictions on
transferability  and  ownership  will  not  apply  if  the  Board  of  Directors
determines  that it is no longer in the  best interest of the Company to attempt
to qualify, or to continue to qualify, as a REIT.
 
    If any purported transfer of Common Stock of the Company or any other  event
would  otherwise  result in  any  person violating  the  Ownership Limit  or the
Charter, then any such purported transfer will be void and of no force or effect
with respect to  the purported  transferee (the "Prohibited  Transferee") as  to
that  number  of shares  in excess  of  the Ownership  Limit and  the Prohibited
Transferee shall acquire  no right or  interest (or,  in the case  of any  event
other  than a purported transfer,  the person or entity  holding record title to
any such shares in excess of the Ownership Limit (the "Prohibited Owner")  shall
cease  to own  any right  or interest)  in such  excess shares.  Any such excess
shares described above will be  transferred automatically, by operation of  law,
to a trust, the beneficiary of which will be a qualified charitable organization
selected  by the Company  (the "Beneficiary"). Such  automatic transfer shall be
deemed to be  effective as  of the  close of business  on the  Business Day  (as
defined  in the Charter) prior to the date of such violative transfer. Within 20
days of receiving  notice from  the Company  of the  transfer of  shares to  the
trust,  the trustee of the trust (who shall  be designated by the Company and be
unaffiliated with the Company and any Prohibited Transferee or Prohibited Owner)
will be required to sell such excess shares to a person or entity who could  own
such  shares  without  violating  the Ownership  Limit,  and  distribute  to the
Prohibited Transferee an amount  equal to the  lesser of the  price paid by  the
Prohibited  Transferee for such excess shares  or the sales proceeds received by
the trust for such  excess shares. In  the case of  any excess shares  resulting
from  any event other than  a transfer, or from  a transfer for no consideration
(such as a gift), the trustee will be  required to sell such excess shares to  a
qualified  person or  entity and  distribute to  the Prohibited  Owner an amount
equal to the lesser  of the fair market  value of such excess  shares as of  the
date  of such event or the sales proceeds  received by the trust for such excess
shares. In either case,  any proceeds in excess  of the amount distributable  to
the   Prohibited  Transferee  or  Prohibited   Owner,  as  applicable,  will  be
distributed to the Beneficiary. Prior to a sale of any such excess shares by the
trust, the trustee will be entitled to receive in trust for the Beneficiary, all
dividends and  other distributions  paid by  the Company  with respect  to  such
excess  shares, and  also will  be entitled to  exercise all  voting rights with
respect to such excess shares. Subject to Maryland law, effective as of the date
that such shares have been transferred to the trust, the trustee shall have  the
authority  (at the trustee's  sole discretion) (i)  to rescind as  void any vote
cast by a Prohibited Transferee prior to the discovery by the Company that  such
shares  have  been transferred  to the  trust and  (ii) to  recast such  vote in
accordance with  the  desires of  the  trustee acting  for  the benefit  of  the
Beneficiary.  However, if the  Company has already  taken irreversible corporate
action, then the trustee shall not have the authority to rescind and recast such
vote. Any dividend or  other distribution paid to  the Prohibited Transferee  or
Prohibited  Owner (prior to  the discovery by  the Company that  such shares had
been automatically transferred to a trust  as described above) will be  required
to  be repaid to the trustee upon demand for distribution to the Beneficiary. In
the event that the transfer to the trust as described above is not automatically
effective (for any reason) to prevent violation of the Ownership Limit, then the
Charter provides that the transfer of the excess shares will be void.
 
    In addition, shares  of stock  of the  Company held  in the  Trust shall  be
deemed to have been offered for sale to the Company, or its designee, at a price
per share equal to the lesser of (i) the price per share in the transaction that
resulted in such transfer to the Trust (or, in the case of a devise or gift, the
Market  Price at the time of  such devise or gift) and  (ii) the Market Price on
the date the  Company, or its  designee, accepts such  offer. The Company  shall
have  the right to  accept such offer until  the Trustee has  sold the shares of
stock held in the Trust.  Upon such a sale to  the Company, the interest of  the
Charitable  Beneficiary in the shares sold shall terminate and the Trustee shall
distribute the net proceeds of the sale to the Prohibited Owner.
 
    All certificates  representing shares  of Common  Stock will  bear a  legend
referring to the restrictions described above.
 
                                      102
<PAGE>
    Under  the Charter, every owner  of a specified percentage  (or more) of the
outstanding shares of Common Stock must file a completed questionnaire with  the
Company  containing information regarding their ownership of such shares, as set
forth in  the  Treasury Regulations.  Under  current Treasury  Regulations,  the
percentage  will be  set between  0.5% and  5.0%, depending  upon the  number of
record holders of the Company's shares. In addition, each stockholder shall upon
demand be required to disclose to the Company in writing such information as the
Company may  request  in  order  to  determine  the  effect,  if  any,  of  such
stockholder's actual and constructive ownership of Common Stock on the Company's
status as a REIT and to ensure compliance with the Ownership Limit.
 
    These  ownership limits  could delay,  defer or  prevent a  transaction or a
change in control  of the Company  that might  involve a premium  price for  the
Common Stock or otherwise be in the best interest of stockholders.
 
    CERTAIN PROVISIONS OF MARYLAND LAW AND THE COMPANY'S CHARTER AND BYLAWS
 
    THE  FOLLOWING  SUMMARY OF  CERTAIN PROVISIONS  OF MARYLAND  LAW AND  OF THE
CHARTER AND BYLAWS OF THE COMPANY DOES NOT PURPORT TO BE COMPLETE AND IS SUBJECT
TO AND QUALIFIED IN ITS  ENTIRETY BY REFERENCE TO  MARYLAND LAW AND THE  CHARTER
AND  BYLAWS OF  THE COMPANY,  COPIES OF WHICH  ARE EXHIBITS  TO THE REGISTRATION
STATEMENT OF WHICH THIS PROSPECTUS IS A PART.
 
    The Charter and the  Bylaws of the Company  contain certain provisions  that
could  make more difficult the  acquisition of the Company  by means of a tender
offer, a proxy contest or otherwise. These provisions are expected to discourage
certain types of coercive takeover practices and inadequate takeover bids and to
encourage persons seeking to acquire control  of the Company to negotiate  first
with  the Board of  Directors. The Company  believes that the  benefits of these
provisions outweigh the potential  disadvantages of discouraging such  proposals
because,  among other things,  negotiation of such proposals  might result in an
improvement of their  terms. The description  set forth below  is intended as  a
summary  only and is qualified  in its entirety by  reference to the Charter and
the  Bylaws,   which  have   been  filed   as  exhibits   to  the   Registration
Statement  of  which this  Prospectus  is a  part.  See also  "Capital  Stock --
Restrictions on Transfer."
 
BOARD OF DIRECTORS - NUMBER, CLASSIFICATION, VACANCIES
 
    The Bylaws  provide that  the number  of  directors of  the Company  may  be
established  by the Board of Directors but may not be fewer than 5 nor more than
11. Any vacancy will be filled, at any regular meeting or at any special meeting
called for that purpose, by a majority of the remaining directors, except that a
vacancy resulting from an increase in the number of directors must be filled  by
a majority of the entire Board of Directors.
 
    The Company's Board of Directors is divided into three classes of directors.
The  initial terms of the  first, second and third  classes will expire in 1997,
1998 and 1999, respectively. Beginning in 1997, directors of each class will  be
chosen  for three-year terms upon the expiration of their current terms and each
year one class of directors will  be elected by the stockholders. The  staggered
terms of directors may reduce the possibility of a tender offer or an attempt to
change  control of the Company  even though a tender  offer or change in control
might be in the best interest of the stockholders.
 
    The  classified  board  provision  could  have  the  effect  of  making  the
replacement  of incumbent directors more time  consuming and difficult. At least
two annual meetings of stockholders, instead of one, will generally be  required
to effect a change in a majority of the Board of Directors. Thus, the classified
board  provision  could increase  the likelihood  that incumbent  directors will
retain their  positions.  The  staggered  terms  of  directors  may  reduce  the
possibility  of a tender offer  or an attempt to  change control of the Company,
even though a tender offer or change in control might be in the best interest of
the stockholders.
 
REMOVAL OF DIRECTORS
 
    The Charter  provides that  a director  may be  removed only  for cause  (as
defined  in the Charter) and only by the affirmative vote of at least two-thirds
of the votes entitled to be cast  in the election of directors. This  provision,
when coupled with the provision in the Bylaws authorizing the Board of Directors
to fill vacant
 
                                      103
<PAGE>
directorships,  precludes stockholders from  removing incumbent directors except
upon the existence of cause for  removal and a substantial affirmative vote  and
filling the vacancies created by such removal with their own nominees.
 
BUSINESS COMBINATIONS
 
    Under  the  MGCL,  certain  "business  combinations"  (including  a  merger,
consolidation, share exchange or, in certain circumstances, an asset transfer or
issuance  or  reclassification   of  equity  securities)   between  a   Maryland
corporation  and any  person who  beneficially owns ten  percent or  more of the
voting power of the corporation's shares or an affiliate of the corporation who,
at any time within the  two-year period prior to the  date in question, was  the
beneficial   owner  of  ten  percent  or  more   of  the  voting  power  of  the
then-outstanding voting stock of  the corporation (an "Interested  Stockholder")
or  an affiliate of such an Interested Stockholder are prohibited for five years
after the  most recent  date  on which  the  Interested Stockholder  becomes  an
Interested  Stockholder.  Thereafter,  any  such  business  combination  must be
recommended by the board  of directors of such  corporation and approved by  the
affirmative vote of at least (a) 80% of the votes entitled to be cast by holders
of  outstanding shares of voting stock of  the corporation and (b) two-thirds of
the votes entitled  to be cast  by holders  of voting stock  of the  corporation
other  than shares held by  the Interested Stockholder with  whom (or with whose
affiliate) the  business combination  is  to be  effected, unless,  among  other
conditions,  the corporation's common  stockholders receive a  minimum price (as
defined in the MGCL) for their shares and the consideration is received in  cash
or  in the same  form as previously  paid by the  Interested Stockholder for its
shares. These provisions  of Maryland  law do  not apply,  however, to  business
combinations  that are  approved or  exempted by the  board of  directors of the
corporation prior  to  the  time  that the  Interested  Stockholder  becomes  an
Interested  Stockholder. In  addition, the  Company's Charter  exempts Mr. Ziman
from the business combination provisions of the MGCL.
 
CONTROL SHARE ACQUISITIONS
 
    The MGCL provides that "control  shares" of a Maryland corporation  acquired
in  a "control  share acquisition"  have no voting  rights except  to the extent
approved by a vote of two-thirds of the votes entitled to be cast on the matter,
excluding shares of stock owned by the acquiror, by officers or by directors who
are employees of the  corporation. "Control shares" are  voting shares of  stock
which,  if aggregated with all other such shares of stock previously acquired by
the acquiror or in respect of which  the acquiror is able to exercise or  direct
the  exercise of voting  power (except solely  by virtue of  a revocable proxy),
would entitle the acquiror to exercise voting power in electing directors within
one of the following ranges of voting power: (i) one-fifth or more but less than
one-third, (ii) one-third or more but less than a majority, or (iii) a  majority
or  more of all voting power. Control shares do not include shares the acquiring
person is then  entitled to  vote as the  result of  having previously  obtained
stockholder  approval. A  "control share  acquisition" means  the acquisition of
control shares, subject to certain exceptions.
 
    A person who has made or proposes to make a control share acquisition,  upon
satisfaction  of certain conditions (including  an undertaking to pay expenses),
may compel the board of directors of  the corporation to call a special  meeting
of  stockholders to  be held  within 50  days of  demand to  consider the voting
rights of the shares. If no request  for a meeting is made, the corporation  may
itself present the question at any stockholders meeting.
 
    If  voting rights are not approved at the meeting or if the acquiring person
does not deliver an acquiring person statement as required by the statute, then,
subject to certain conditions and limitations, the corporation may redeem any or
all of the control shares (except those for which voting rights have  previously
been  approved)  for fair  value determined,  without regard  to the  absence of
voting rights for the control shares, as  of the date of the last control  share
acquisition  by the  acquiror or  of any  meeting of  stockholders at  which the
voting rights of such shares are  considered and not approved. If voting  rights
for  control  shares are  approved at  a stockholders  meeting and  the acquiror
becomes entitled to vote a  majority of the shares  entitled to vote, all  other
stockholders  may exercise  appraisal rights.  The fair  value of  the shares as
determined for  purposes of  such appraisal  rights  may not  be less  than  the
highest price per share paid by the acquiror in the control share acquisition.
 
                                      104
<PAGE>
    The  control share acquisition statute does not apply (a) to shares acquired
in a merger, consolidation or  share exchange if the  corporation is a party  to
the  transaction or (b) to  acquisitions approved or exempted  by the charter or
bylaws of the corporation.
 
    The Bylaws of  the Company contain  a provision exempting  from the  control
share  acquisition  statute  any  and  all acquisitions  by  any  person  of the
Company's shares of stock.  There can be no  assurance that such provision  will
not be amended or eliminated at any time in the future.
 
AMENDMENT TO THE CHARTER
 
    The  Charter, including  its provisions  on classification  of the  Board of
Directors and removal of directors, may be amended only by the affirmative  vote
of  the holders of not less  than two thirds of all  of the votes entitled to be
cast on the matter.
 
DISSOLUTION OF THE COMPANY
 
    The dissolution of the Company must  be approved by the affirmative vote  of
the  holders of not less than two thirds of all of the votes entitled to be cast
on the matter.
 
ADVANCE NOTICE OF DIRECTOR NOMINATIONS AND NEW BUSINESS
 
    The Bylaws of the Company provide that (a) with respect to an annual meeting
of stockholders, nominations of persons for  election to the Board of  Directors
and  the proposal of business to be  considered by stockholders may be made only
(i) pursuant  to the  Company's notice  of the  meeting, (ii)  by the  Board  of
Directors  or (iii) by a stockholder who is  entitled to vote at the meeting and
has complied with the advance notice procedures set forth in the Bylaws and  (b)
with  respect  to  special  meetings  of  the  stockholders,  only  the business
specified in the Company's notice of  meeting may be brought before the  meeting
of  stockholders  and  nominations  of  persons for  election  to  the  Board of
Directors may be made only (i) pursuant to the Company's notice of the  meeting,
(ii) by the Board of Directors or (iii) provided that the Board of Directors has
determined that directors shall be elected at such meeting, by a stockholder who
is  entitled to  vote at the  meeting and  has complied with  the advance notice
provisions set forth in the Bylaws.
 
ANTI-TAKEOVER EFFECT OF CERTAIN PROVISIONS OF MARYLAND LAW AND OF THE CHARTER
AND BYLAWS
 
    The business combination provisions and, if the applicable provision in  the
Bylaws  is rescinded, the control share  acquisition provisions of the MGCL, the
provisions of  the Charter  on  classification of  the  Board of  Directors  and
removal  of  directors and  the advance  notice provisions  of the  Bylaws could
delay, defer or prevent a transaction or a change in control of the Company that
might involve a premium  price for holders  of Common Stock  or otherwise be  in
their best interest.
 
RIGHTS TO PURCHASE SECURITIES AND OTHER PROPERTY
 
    The  Charter authorizes  the Board of  Directors to create  and issue rights
entitling the holders thereof  to purchase from the  Company shares of stock  or
other  securities or  property. The  times at  which and  terms upon  which such
rights are to be issued  would be determined by the  Board of Directors and  set
forth  in the contracts or instruments that evidence such rights. This provision
is intended to confirm the Board of Directors' authority to issue share purchase
rights, which may have terms that could  impede a merger, tender offer or  other
takeover  attempt,  or other  rights  to purchase  shares  or securities  of the
Company or any other corporation.
 
                                      105
<PAGE>
                        SHARES AVAILABLE FOR FUTURE SALE
 
GENERAL
 
    Upon the  completion of  the  Offering, the  Company will  have  outstanding
18,725,000  shares  of  Common  Stock (21,533,000  shares  if  the Underwriters'
overallotment option is  exercised in  full). In addition,  2,706,000 shares  of
Common  Stock are reserved for issuance upon exchange of OP Units. The shares of
Common Stock issued in  the Offering will be  freely tradeable by persons  other
than  "affiliates" of the Company without  restriction under the Securities Act,
subject to the limitations on ownership  set forth in the Charter. See  "Capital
Stock  -- Restrictions  on Transfer."  The shares of  Common Stock  owned by the
Participants or  acquired by  any Participant  in redemption  of OP  Units  (the
"Restricted  Shares") will be "restricted" securities  under the meaning of Rule
144 promulgated under the Securities Act ("Rule 144") and may not be sold in the
absence of  registration  under the  Securities  Act unless  an  exemption  from
registration  is  available,  including  exemptions contained  in  Rule  144. As
described below under " -- Registration Rights," the Company has granted certain
holders registration rights with respect to their shares of Common Stock.
 
    In general, under Rule 144 as currently in effect, if two years have elapsed
since the later of the date of acquisition of Restricted Shares from the Company
or any "affiliate" of the Company, as that term is defined under the  Securities
Act,  the acquiror or subsequent  holder thereof is entitled  to sell within any
three-month period a number of shares that does not exceed the greater of 1%  of
the then outstanding shares of Common Stock or the average weekly trading volume
of  the Common Stock during the four  calendar weeks preceding the date on which
notice of the sale is filed with the SEC. Sales under Rule 144 are also  subject
to  certain manner of sales provisions, notice requirements and the availability
of current public  information about the  Company. If three  years have  elapsed
since  the date of acquisition of Restricted Shares from the Company or from any
"affiliate" of the  Company, and the  acquiror or subsequent  holder thereof  is
deemed  not to have been an  affiliate of the Company at  any time during the 90
days preceding a sale, such person is entitled to sell such shares in the public
market under Rule  144(k) without regard  to the volume  limitations, manner  of
sale provisions, public information requirements or notice requirements.
 
    The Commission has proposed to amend the holding period required by Rule 144
to  permit sales of "restricted securities" after one year rather than two years
(and two years rather than three  years for "non-affiliates" who desire to  sell
such  shares under  Rule 144(k)). If  such proposed amendment  were enacted, the
"restricted securities" would become freely tradeable (subject to any applicable
contractual restrictions) at these earlier dates.
 
    In connection with the Offering, Messrs.  Ziman and Coleman have agreed  not
to  sell any shares of  Common Stock acquired by them  upon exchange of OP Units
for a period  of two  years after  the completion  of the  Offering without  the
consent  of Lehman Brothers Inc. Such restriction will not apply to any OP Units
or other shares of Common Stock purchased or otherwise acquired by Messrs. Ziman
or Coleman following consummation of the Offering. See "Underwriting."
 
    The Company has  established the  Stock Incentive  Plan for  the purpose  of
attracting  and retaining directors, executive officers and other key employees.
See "Management -- Stock Incentive Plan" and "-- Compensation of Directors." The
Company intends to  issue options  to purchase approximately  780,000 shares  of
Common Stock to directors, executive officers and certain key employees prior to
the  completion of the  Offering and has reserved  720,000 additional shares for
future issuance under the Stock Incentive  Plan. Prior to the expiration of  the
initial  12-month  period following  consummation of  the Offering,  the Company
expects to file a registration statement on  Form S-8 with the SEC with  respect
to  the shares of  Common Stock issuable  under the Stock  Incentive Plan, which
shares may be resold without restriction, unless held by affiliates.
 
    Prior to the Offering, there has been no public market for the Common Stock.
Trading of  the Common  Stock on  the New  York Stock  Exchange is  expected  to
commence immediately following the completion of the Offering. No prediction can
be  made  as  to  the effect,  if  any,  that  future sales  of  shares,  or the
availability of shares for future sale, will have on the market price prevailing
from time  to time.  Sales of  substantial amounts  of Common  Stock  (including
shares   issued  upon  the   exercise  of  Options),   or  the  perception  that
 
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such sales occur, could adversely affect prevailing market prices of the  Common
Stock.  See "Risk Factors -- Absence of  Prior Public Market for Common Stock --
Effect  on  Common  Stock  Price  of  Shares  Available  for  Future  Sale"  and
"Partnership Agreement -- Transferability of Interests."
 
REGISTRATION RIGHTS
 
    The  Company  has granted  the  Participants who  received  OP Units  in the
Formation Transactions certain registration rights with respect to the shares of
Common Stock owned by them or acquired  by them in connection with the  exercise
of  the  Redemption/Exchange  Rights  under  the  Partnership  Agreement.  These
registration rights require the  Company to register all  such shares of  Common
Stock  effective on the  first anniversary of the  consummation of the Offering.
The Company will bear expenses  incident to its registration requirements  under
the  registration  rights,  except  that such  expenses  shall  not  include any
underwriting discounts or  commissions or  transfer taxes, if  any, relating  to
such shares.
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
    The  following summary of certain material federal income tax considerations
regarding the Company and the Offering is  based on current law, is for  general
information  only and is not tax advice. The information set forth below, to the
extent that it constitutes matters of  law, summaries of legal matters or  legal
conclusions is the opinion of Latham & Watkins, tax counsel to the Company. This
discussion  does not purport  to deal with  all aspects of  taxation that may be
relevant to particular stockholders in light of their personal investment or tax
circumstances, or to certain types of stockholders subject to special  treatment
under  the tax laws, including without limitation insurance companies, financial
institutions or broker-dealers, tax-exempt  organizations (except to the  extent
discussed  under the heading  "Taxation of Tax-Exempt  Stockholders") or foreign
corporations and persons who are not citizens or residents of the United  States
(except  to  the  extent  discussed  under  the  heading  "Taxation  of Non-U.S.
Stockholders"). In addition, the summary below  does not consider the effect  of
any  foreign,  state,  local  or  other  tax  laws  that  may  be  applicable to
prospective stockholders.
 
    EACH PROSPECTIVE PURCHASER IS ADVISED TO CONSULT HIS OR HER OWN TAX  ADVISOR
REGARDING THE SPECIFIC TAX CONSEQUENCES TO HIM OR HER OF THE PURCHASE, OWNERSHIP
AND  SALE OF THE COMMON STOCK, INCLUDING  THE FEDERAL, STATE, LOCAL, FOREIGN AND
OTHER TAX CONSEQUENCES  OF SUCH PURCHASE,  OWNERSHIP AND SALE  AND OF  POTENTIAL
CHANGES IN APPLICABLE TAX LAWS.
 
TAXATION OF THE COMPANY
 
    GENERAL.   The Company plans to make an election to be taxed as a REIT under
Sections 856 through 860  of the Code, commencing  with its taxable year  ending
December  31, 1996. The Company believes  that, commencing with its taxable year
ending December 31, 1996, it will be organized and will operate in such a manner
as to qualify for taxation as a REIT under the Code commencing with such taxable
year, and the Company intends  to continue to operate in  such a manner, but  no
assurance  can be given that it will continue  to operate in such a manner so as
to qualify or remain qualified.
 
    These sections of the Code  and the corresponding Treasury Regulations,  are
highly  technical and complex. The following  sets forth the material aspects of
the sections that  govern the federal  income tax  treatment of a  REIT and  its
stockholders.  This summary is qualified in  its entirety by the applicable Code
provisions, rules and regulations promulgated thereunder, and administrative and
judicial interpretations thereof.
 
    Latham & Watkins has acted as tax counsel to the Company in connection  with
the Offering and the Company's election to be taxed as a REIT. In the opinion of
Latham & Watkins, commencing with the Company's taxable year ending December 31,
1996,  the Company  will be  organized in  conformity with  the requirements for
qualification as a REIT, and its proposed method of operation will enable it  to
meet  the requirements for qualification and taxation  as a REIT under the Code.
It must be emphasized that this
 
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opinion  is based upon certain representations made by the Company as to factual
matters relating  to the  organization  and operation  of  the Company  and  the
Operating  Partnership.  In addition,  this opinion  is  based upon  the factual
representations of the  Company concerning  its business and  properties as  set
forth  in  this  Prospectus  and  assumes that  the  actions  described  in this
Prospectus are completed in a  timely fashion. Moreover, such qualification  and
taxation  as a REIT depends  upon the Company's ability  to meet (through actual
annual operating results, distribution levels and diversity of stock  ownership)
the  various qualification  tests imposed  under the  Code discussed  below, the
results of  which will  not be  reviewed by  Latham &  Watkins. Accordingly,  no
assurance  can be given that  the actual results of  the Company's operation for
any particular  taxable  year  will  satisfy  such  requirements.  Further,  the
anticipated  income tax treatment  described in this  Prospectus may be changed,
perhaps retroactively, by legislative, administrative or judicial action at  any
time. See " -- Failure to Qualify."
 
    If  the Company qualifies for  taxation as a REIT,  it generally will not be
subject to federal corporate  income taxes on its  net income that is  currently
distributed to stockholders. This treatment substantially eliminates the "double
taxation"  (at the corporate and stockholder levels) that generally results from
investment in a  regular corporation. However,  the Company will  be subject  to
federal  income tax  as follows:  First, the  Company will  be taxed  at regular
corporate  rates   on  any   undistributed   REIT  taxable   income,   including
undistributed  net  capital  gains.  Second,  under  certain  circumstances, the
Company may be  subject to the  "alternative minimum  tax" on its  items of  tax
preference.  Third, if  the Company has  (i) net  income from the  sale or other
disposition of  "foreclosure  property" which  is  held primarily  for  sale  to
customers  in the ordinary course of business or (ii) other nonqualifying income
from foreclosure property, it  will be subject to  tax at the highest  corporate
rate  on such  income. Fourth,  if the  Company has  net income  from prohibited
transactions (which  are, in  general, certain  sales or  other dispositions  of
property held primarily for sale to customers in the ordinary course of business
other  than foreclosure property),  such income will  be subject to  a 100% tax.
Fifth, if the Company should  fail to satisfy the 75%  gross income test or  the
95%  gross income test (as discussed  below), but has nonetheless maintained its
qualification as a  REIT because certain  other requirements have  been met,  it
will  be  subject to  a 100%  tax on  an amount  equal to  (a) the  gross income
attributable to the greater of the amount by which the Company fails the 75%  or
95%  test  multiplied  by  (b)  a fraction  intended  to  reflect  the Company's
profitability. Sixth,  if the  Company  should fail  to distribute  during  each
calendar  year at least the sum of (i)  85% of its REIT ordinary income for such
year, (ii) 95% of its REIT capital gain net income for such year, and (iii)  any
undistributed taxable income from prior periods, the Company would be subject to
a  4% excise tax  on the excess  of such required  distribution over the amounts
actually distributed.  Seventh, with  respect  to any  asset (a  "Built-In  Gain
Asset")  acquired by  the Company from  a corporation which  is or has  been a C
corporation (I.E., generally a corporation subject to full corporate-level  tax)
in  a transaction in which the basis of  the Built-In Gain Asset in the hands of
the Company is determined by reference to the basis of the asset in the hands of
the C corporation,  if the Company  recognizes gain on  the disposition of  such
asset  during the  ten-year period (the  "Recognition Period")  beginning on the
date on which such asset was acquired by the Company, then, to the extent of the
Built-In Gain (i.e., the excess of (a) the fair market value of such asset  over
(b)  the Company's adjusted basis in such  asset, determined as of the beginning
of the Recognition  Period), such gain  will be  subject to tax  at the  highest
regular  corporate rate pursuant to Internal Revenue Service ("IRS") regulations
that have not yet been promulgated. The results described above with respect  to
the  recognition of Built-In Gain assume that  the Company will make an election
pursuant to IRS Notice 88-19.
 
    REQUIREMENTS FOR QUALIFICATION.  The Code  defines a REIT as a  corporation,
trust  or association (i) which is managed by one or more trustees or directors;
(ii) the beneficial ownership of which  is evidenced by transferable shares,  or
by  transferable  certificates  of  beneficial interest;  (iii)  which  would be
taxable as a domestic corporation, but for Sections 856 through 859 of the Code;
(iv) which is neither a financial  institution nor an insurance company  subject
to certain provisions of the Code; (v) the beneficial ownership of which is held
by  100 or more persons; (vi) during the last half of each taxable year not more
than 50%  in value  of the  outstanding stock  of which  is owned,  actually  or
constructively,  by five or fewer individuals (as defined in the Code to include
certain entities); and (vii) which  meets certain other tests, described  below,
regarding the nature of its income and assets. The Code provides that conditions
(i)  to (iv),  inclusive, must be  met during  the entire taxable  year and that
condition  (v)  must   be  met   during  at  least   335  days   of  a   taxable
 
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year  of twelve months, or during a proportionate part of a taxable year of less
than twelve months. Conditions (v) and (vi) will not apply until after the first
taxable year for which an election is made  to be taxed as a REIT. For  purposes
of  conditions (v) and (vi), pension funds and certain other tax-exempt entities
are treated as individuals, subject to a "look-through" exception in the case of
condition (vi).
 
    The Company believes that  it will have issued  sufficient shares of  Common
Stock  with sufficient diversity of ownership  pursuant to the Offering to allow
it to  satisfy conditions  (v)  and (vi).  In  addition, the  Company's  Charter
provides  for restrictions regarding the transfer and ownership of shares, which
restrictions are intended  to assist the  Company in continuing  to satisfy  the
share ownership requirements described in (v) and (vi) above. Such ownership and
transfer  restrictions  are  described  in  "Capital  Stock  --  Restrictions on
Transfer." These restrictions, however, may not ensure that the Company will, in
all cases, be able to satisfy the share ownership requirements described  above.
If the Company fails to satisfy such share ownership requirements, the Company's
status as a REIT will terminate. See " -- Failure to Qualify."
 
    In addition, a corporation may not elect to become a REIT unless its taxable
year is the calendar year. The Company will have a calendar taxable year.
 
    OWNERSHIP  OF A  PARTNERSHIP INTEREST.   In the  case of  a REIT  which is a
partner in a  partnership, Treasury Regulations  provide that the  REIT will  be
deemed  to own its proportionate share of the assets of the partnership and will
be deemed to be entitled to the  income of the partnership attributable to  such
share.  In  addition,  the character  of  the  assets and  gross  income  of the
partnership shall  retain  the same  character  in the  hands  of the  REIT  for
purposes of Section 856 of the Code, including satisfying the gross income tests
and  the asset tests. Thus, the Company's  proportionate share of the assets and
items  of  income  of  the   Operating  Partnership  (including  the   Operating
Partnership's  share  of  such items  of  any subsidiary  partnerships)  will be
treated as assets and items  of income of the  Company for purposes of  applying
the  requirements described herein. A summary of the rules governing the federal
income taxation of partnerships and their partners is provided below in " -- Tax
Aspects of the  Operating Partnership." The  Company has direct  control of  the
Operating Partnership and intends to operate it consistent with the requirements
for qualification as a REIT.
 
    INCOME  TESTS.  In  order to maintain  qualification as a  REIT, the Company
annually must satisfy three  gross income requirements. First,  at least 75%  of
the Company's gross income (excluding gross income from prohibited transactions)
for  each taxable year  must be derived directly  or indirectly from investments
relating to real property or mortgages  on real property (including "rents  from
real property" and, in certain circumstances, interest) or from certain types of
temporary  investments.  Second,  at least  95%  of the  Company's  gross income
(excluding gross income from prohibited transactions) for each taxable year must
be derived from  such real  property investments, dividends,  interest and  gain
from  the sale or disposition of stock or securities (or from any combination of
the foregoing). Third,  short-term gain from  the sale or  other disposition  of
stock  or securities, gain from prohibited transactions  and gain on the sale or
other disposition of  real property held  for less than  four years (apart  from
involuntary  conversions and sales of  foreclosure property) must represent less
than 30% of the Company's gross  income (including gross income from  prohibited
transactions)  for each  taxable year.  For purposes  of applying  the 30% gross
income test,  the  holding  period  of  Properties  acquired  by  the  Operating
Partnership  in the Formation  Transactions will be deemed  to have commenced on
the date of acquisition.
 
    Rents received by the Company will qualify as "rents from real property"  in
satisfying  the gross  income requirements  for a  REIT described  above only if
several conditions are met. First, the amount of rent must not be based in whole
or in part on the income or  profits of any person. However, an amount  received
or  accrued  generally will  not  be excluded  from  the term  "rents  from real
property" solely by reason of being  based on a fixed percentage or  percentages
of  receipts or  sales. Second,  the Code  provides that  rents received  from a
tenant will not qualify  as "rents from real  property" in satisfying the  gross
income  tests if the REIT, or an actual  or constructive owner of 10% or more of
the REIT, actually or constructively owns 10% or more of such tenant (a "Related
Party Tenant").  Third, if  rent attributable  to personal  property, leased  in
connection  with a lease of real property, is greater than 15% of the total rent
received under the lease, then the portion of rent attributable to such personal
property will not qualify as "rents from real property."
 
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<PAGE>
Finally, for rents received to qualify  as "rents from real property," the  REIT
generally  must not operate or manage the property or furnish or render services
to the tenants of  such property, other than  through an independent  contractor
from  whom the REIT derives no revenue.  The REIT may, however, directly perform
certain services that are "usually  or customarily rendered" in connection  with
the  rental  of  space  for  occupancy only  and  are  not  otherwise considered
"rendered to the occupant" of  the property. The Company  does not and will  not
(i) charge rent for any property that is based in whole or in part on the income
or  profits of any  person (except by reason  of being based  on a percentage of
receipts or sales,  as described  above), (ii) rent  any property  to a  Related
Party  Tenant (unless the  Board of Directors determines  in its discretion that
the rent received from such  Related Party Tenant is  not material and will  not
jeopardize  the  Company's  status  as  a  REIT),  (iii)  derive  rental  income
attributable to  personal  property  (other than  personal  property  leased  in
connection with the lease of real property, the amount of which is less than 15%
of the total rent received under the lease), or (iv) perform services considered
to  be  rendered  to  the  occupant  of  the  property,  other  than  through an
independent contractor from whom the Company derives no revenue.
 
    The Company  expects to  receive fees  in exchange  for the  performance  of
certain  management activities for  third parties with  respect to properties in
which  the  Company  does  not  own  an  interest.  Such  fees  will  result  in
nonqualifying  income to the Company  under the 95% and  75% gross income tests.
The Company believes that  the aggregate amount of  nonqualifying income in  any
taxable  year, including such  fees, will not exceed  the limit on nonqualifying
income under the gross income tests.
 
    The term  "interest"  generally does  not  include any  amount  received  or
accrued  (directly or indirectly) if the determination of such amount depends in
whole or in  part on the  income or profits  of any person.  However, an  amount
received  or accrued  generally will  not be  excluded from  the term "interest"
solely by reason of being based on a fixed percentage or percentages of receipts
or sales.
 
    If the Company fails to satisfy one or  both of the 75% or 95% gross  income
tests  for any taxable year, it may nevertheless qualify as a REIT for such year
if it is entitled to relief under  certain provisions of the Code. These  relief
provisions  will be  generally available if  the Company's failure  to meet such
tests was due to reasonable  cause and not due  to willful neglect, the  Company
attaches  a schedule  of the  sources of  its income  to its  federal income tax
return, and any incorrect information on the schedule was not due to fraud  with
intent  to  evade tax.  It is  not possible,  however, to  state whether  in all
circumstances the  Company would  be entitled  to the  benefit of  these  relief
provisions.  For example, if the Company fails to satisfy the gross income tests
because nonqualifying income that the  Company intentionally incurs exceeds  the
limits  on such  income, the  IRS could conclude  that the  Company's failure to
satisfy the tests was  not due to reasonable  cause. If these relief  provisions
are inapplicable to a particular set of circumstances involving the Company, the
Company  will not qualify as  a REIT. As discussed above  in "-- Taxation of the
Company --  General," even  if these  relief provisions  apply, a  tax would  be
imposed  with respect to the excess  net income. No similar mitigation provision
provides relief if  the Company fails  the 30%  income test. In  such case,  the
Company would cease to qualify as a REIT.
 
    Any  gain  realized by  the  Company on  the sale  of  any property  held as
inventory or other property held primarily for sale to customers in the ordinary
course of business (including the Company's  share of any such gain realized  by
the  Operating  Partnership)  will  be  treated  as  income  from  a  prohibited
transaction that is subject to a  100% penalty tax. Such prohibited  transaction
income may also have an adverse effect upon the Company's ability to satisfy the
income  tests for qualification as a  REIT. Under existing law, whether property
is held as inventory or primarily for  sale to customers in the ordinary  course
of  a trade or business is a question of  fact that depends on all the facts and
circumstances  with  respect  to  the  particular  transaction.  The   Operating
Partnership  intends  to  hold the  Properties  for  investment with  a  view to
long-term appreciation,  to engage  in the  business of  acquiring,  developing,
owning,  and operating  the Properties (and  other properties) and  to make such
occasional sales  of  the  Properties  as  are  consistent  with  the  Operating
Partnership's  investment objectives. There  can be no  assurance, however, that
the IRS might not contend that one or more of such sales is subject to the  100%
penalty tax.
 
    ASSET TESTS.  The Company, at the close of each quarter of its taxable year,
must  also satisfy three tests  relating to the nature  of its assets. First, at
least  75%  of  the  value  of   the  Company's  total  assets  (including   its
 
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allocable  share  of  the assets  held  by  the Operating  Partnership)  must be
represented by real  estate assets  including (i)  its allocable  share of  real
estate  assets held by  partnerships in which  the Company owns  an interest and
(ii) stock or debt instruments  held for not more  than one year purchased  with
the  proceeds  of a  stock  offering or  long-term  (at least  five  years) debt
offering of the Company, cash, cash items and government securities. Second, not
more than 25%  of the Company's  total assets may  be represented by  securities
other  than those in the 75% asset  class. Third, of the investments included in
the 25% asset  class, the  value of  any one  issuer's securities  owned by  the
Company  may not exceed  5% of the value  of the Company's  total assets and the
Company may  not  own more  than  10% of  any  one issuer's  outstanding  voting
securities.
 
    After  initially meeting the  asset tests at  the close of  any quarter, the
Company will not  lose its status  as a REIT  for failure to  satisfy the  asset
tests at the end of a later quarter solely by reason of changes in asset values.
If  the  failure to  satisfy  the asset  tests  results from  an  acquisition of
securities or other  property during  a quarter (including  as a  result of  the
Company  increasing its interest in the  Operating Partnership), the failure can
be cured by disposition of sufficient nonqualifying assets within 30 days  after
the  close of that quarter. The Company  intends to maintain adequate records of
the value of its assets  to ensure compliance with the  asset tests and to  take
such  other actions  within 30  days after the  close of  any quarter  as may be
required to cure any noncompliance. If  the Company fails to cure  noncompliance
with the asset tests within such time period, the Company would cease to qualify
as a REIT.
 
    ANNUAL  DISTRIBUTION REQUIREMENTS.   The Company,  in order to  qualify as a
REIT, is required to distribute dividends (other than capital gain dividends) to
its stockholders in an amount at  least equal to (i) the  sum of (a) 95% of  the
Company's  "REIT taxable income" (computed without  regard to the dividends paid
deduction and the  Company's net capital  gain) and  (b) 95% of  the net  income
(after  tax), if any, from  foreclosure property, minus (ii)  the sum of certain
items of noncash income.  In addition, if the  Company disposes of any  Built-In
Gain Asset during its Recognition Period, the Company will be required, pursuant
to  Treasury Regulations which  have not yet been  promulgated, to distribute at
least 95%  of  the  Built-in  Gain  (after  tax),  if  any,  recognized  on  the
disposition  of such asset. Such distributions must  be paid in the taxable year
to which they relate, or  in the following taxable  year if declared before  the
Company  timely files its tax return for such  year and if paid on or before the
first regular dividend payment  after such declaration. To  the extent that  the
Company  does not distribute all of its net capital gain or distributes at least
95%, but less than 100%, of its  "REIT taxable income," as adjusted, it will  be
subject to tax thereon at regular ordinary and capital gain corporate tax rates.
The  Company intends  to make timely  distributions sufficient  to satisfy these
annual distribution  requirements. In  this  regard, the  Partnership  Agreement
authorizes  the  Company, as  general  partner, to  take  such steps  as  may be
necessary to cause the  Operating Partnership to distribute  to its partners  an
amount sufficient to permit the Company to meet these distribution requirements.
 
    It  is expected that the Company's REIT taxable income will be less than its
cash flow due  to the allowance  of depreciation and  other non-cash charges  in
computing REIT taxable income. Accordingly, the Company anticipates that it will
generally  have sufficient  cash or  liquid assets to  enable it  to satisfy the
distribution requirements described  above. It  is possible,  however, that  the
Company,  from time to time, may not have sufficient cash or other liquid assets
to meet these distribution  requirements due to  timing differences between  (i)
the  actual receipt of income and actual payment of deductible expenses and (ii)
the inclusion  of such  income and  deduction of  such expenses  in arriving  at
taxable  income of the Company. In the event that such timing differences occur,
in order  to  meet  the  distribution requirements,  the  Company  may  find  it
necessary to arrange for short-term, or possibly long-term, borrowings or to pay
dividends in the form of taxable stock dividends.
 
    Under certain circumstances, the Company may be able to rectify a failure to
meet the distribution requirement for a year by paying "deficiency dividends" to
stockholders  in a later year, which may  be included in the Company's deduction
for dividends paid for the earlier year. Thus, the Company may be able to  avoid
being taxed on amounts distributed as deficiency dividends; however, the Company
will  be required to pay  interest based upon the  amount of any deduction taken
for deficiency dividends.
 
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    Furthermore, if the Company should  fail to distribute during each  calendar
year at least the sum of (i) 85% of its REIT ordinary income for such year, (ii)
95%  of its REIT capital gain income  for such year, and (iii) any undistributed
taxable income from prior periods, the Company  would be subject to a 4%  excise
tax  on  the excess  of  such required  distribution  over the  amounts actually
distributed.
 
FAILURE TO QUALIFY
 
    If the Company fails to qualify for taxation as a REIT in any taxable  year,
and  the relief  provisions do  not apply,  the Company  will be  subject to tax
(including any  applicable alternative  minimum tax)  on its  taxable income  at
regular  corporate rates. Distributions to stockholders in any year in which the
Company fails to qualify will not be deductible by the Company nor will they  be
required  to be made.  As a result, the  Company's failure to  qualify as a REIT
would significantly reduce the cash available for distribution by the Company to
its stockholders. In addition, if  the Company fails to  qualify as a REIT,  all
distributions  to stockholders will be taxable as ordinary income, to the extent
of the Company's current and accumulated  earnings and profits, and, subject  to
certain  limitations of the Code, corporate distributees may be eligible for the
dividends received deduction. Unless entitled to relief under specific statutory
provisions, the Company will  also be disqualified from  taxation as a REIT  for
the  four taxable years following the  year during which qualification was lost.
It is not possible to  state whether in all  circumstances the Company would  be
entitled to such statutory relief.
 
TAXATION OF TAXABLE U.S. STOCKHOLDERS GENERALLY
 
    As  used herein,  the term  "U.S. Stockholder" means  a holder  of shares of
Common Stock  who (for  United States  federal  income tax  purposes) (i)  is  a
citizen or resident of the United States, (ii) is a corporation, partnership, or
other  entity created or organized in or under  the laws of the United States or
of any political subdivision thereof, or (iii) is an estate or trust the  income
of  which is subject to United States  federal income taxation regardless of its
source.
 
    As long  as the  Company qualifies  as  a REIT,  distributions made  by  the
Company  out  of  its  current  or accumulated  earnings  and  profits  (and not
designated as capital gain dividends)  will constitute dividends taxable to  its
taxable  U.S. Stockholders  as ordinary income.  Such distributions  will not be
eligible for the dividends received deduction  in the case of U.S.  Stockholders
that  are  corporations. Distributions  made by  the  Company that  are properly
designated by the Company as capital  gain dividends will be taxable to  taxable
U.S.  Stockholders as long-term  capital gains (to  the extent that  they do not
exceed the  Company's actual  net capital  gain for  the taxable  year)  without
regard  to the period for which a U.S. Stockholder has held his shares of Common
Stock. U.S.  Stockholders that  are corporations  may, however,  be required  to
treat  up to 20%  of certain capital  gain dividends as  ordinary income. To the
extent that  the Company  makes distributions  (not designated  as capital  gain
dividends)  in excess of its current  and accumulated earnings and profits, such
distributions will be treated first as a tax-free return of capital to each U.S.
Stockholder, reducing the adjusted basis which such U.S. Stockholder has in  his
shares  of Common Stock for tax purposes by the amount of such distribution (but
not below zero), with distributions in  excess of a U.S. Stockholder's  adjusted
basis in his shares taxable as capital gains (provided that the shares have been
held  as  a  capital  asset).  Dividends declared  by  the  Company  in October,
November, or December of any  year and payable to a  stockholder of record on  a
specified  date in any such  month shall be treated as  both paid by the Company
and received by the stockholder on December  31 of such year, provided that  the
dividend  is  actually  paid by  the  Company on  or  before January  31  of the
following calendar year. Stockholders  may not include in  their own income  tax
returns any net operating losses or capital losses of the Company.
 
    Distributions made by the Company and gain arising from the sale or exchange
by  a U.S. Stockholder of shares of Common  Stock will not be treated as passive
activity income, and, as a result, U.S. Stockholders generally will not be  able
to apply any "passive losses" against such income or gain. Distributions made by
the Company (to the extent they do not constitute a return of capital) generally
will  be treated as  investment income for purposes  of computing the investment
income limitation. Gain  arising from the  sale or other  disposition of  Common
Stock,  however,  will  not be  treated  as  investment income  unless  the U.S.
Stockholder elects to  reduce the amount  of such U.S.  Stockholder's total  net
capital  gain eligible for the  28% maximum capital gains  rate by the amount of
such gain with respect to such Common Stock.
 
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    Upon any sale or other disposition of Common Stock, a U.S. Stockholder  will
recognize gain or loss for federal income tax purposes in an amount equal to the
difference  between (i)  the amount  of cash  and the  fair market  value of any
property received  on such  sale  or other  disposition  and (ii)  the  holder's
adjusted  basis in such  shares of Common  Stock for tax  purposes. Such gain or
loss will be  capital gain  or loss if  the shares  have been held  by the  U.S.
Stockholder  as a  capital asset,  and will  be long-term  gain or  loss if such
shares have been held for more than one year. In general, any loss recognized by
a U.S. Stockholder upon the sale or other disposition of shares of Common  Stock
that  have been  held for  six months  or less  (after applying  certain holding
period rules) will  be treated as  a long-term  capital loss, to  the extent  of
distributions  received by  such U.S.  Stockholder from  the Company  which were
required to be treated as long-term capital gains.
 
BACKUP WITHHOLDING
 
    The Company will report to its U.S.  Stockholders and the IRS the amount  of
dividends  paid during each  calendar year, and  the amount of  tax withheld, if
any. Under the backup withholding rules, a stockholder may be subject to  backup
withholding at the rate of 31% with respect to dividends paid unless such holder
(a)  is a corporation or comes within  certain other exempt categories and, when
required, demonstrates  this fact,  or (b)  provides a  taxpayer  identification
number,  certifies  as to  no  loss of  exemption  from backup  withholding, and
otherwise complies with applicable requirements of the backup withholding rules.
A U.S. Stockholder that does not  provide the Company with his correct  taxpayer
identification  number may also be subject to  penalties imposed by the IRS. Any
amount paid as backup withholding  will be creditable against the  stockholder's
income  tax liability. In  addition, the Company  may be required  to withhold a
portion of capital gain  distributions to any stockholders  who fail to  certify
their  non-foreign  status  to  the  Company.  See  "  --  Taxation  of Non-U.S.
Stockholders."
 
TAXATION OF TAX-EXEMPT STOCKHOLDERS
 
    The IRS has ruled that amounts distributed as dividends by a qualified  REIT
do  not constitute unrelated business taxable income ("UBTI") when received by a
tax-exempt entity. Based on that ruling, provided that a tax-exempt  stockholder
(except certain tax-exempt stockholders described below) has not held its shares
of  Common Stock as "debt financed property"  within the meaning of the Code and
such shares are not otherwise used in  a trade or business, the dividend  income
from the Company will not be UBTI to a tax-exempt stockholder. Similarly, income
from  the sale of Common  Stock will not constitute  UBTI unless such tax-exempt
stockholder has held such shares as "debt financed property" within the  meaning
of the Code or has used the shares in a trade or business.
 
    For  tax-exempt  stockholders  that  are  social  clubs,  voluntary employee
benefit associations, supplemental  unemployment benefit  trusts, and  qualified
group  legal  services  plans exempt  from  federal income  taxation  under Code
Sections 501 (c)(7), (c)(9), (c)(17)  and (c)(20), respectively, income from  an
investment  in the Company will constitute  UBTI unless the organization is able
to properly deduct amounts set aside  or placed in reserve for certain  purposes
so  as to  offset the income  generated by  its investment in  the Company. Such
prospective investors should  consult their  own tax  advisors concerning  these
"set aside" and reserve requirements.
 
    Notwithstanding the above, however, the Omnibus Budget Reconciliation Act of
1993  (the "1993 Act")  provides that, effective for  taxable years beginning in
1994, a portion of the dividends paid by a "pension held REIT" shall be  treated
as  UBTI as to any trust  which (i) is described in  Section 401(a) of the Code,
(ii) is tax-exempt under Section 501(a) of  the Code, and (iii) holds more  than
10%  (by value) of the interests in  the REIT. Tax-exempt pension funds that are
described in Section  401(a) of  the Code are  referred to  below as  "qualified
trusts."
 
    A REIT is a "pension held REIT" if (i) it would not have qualified as a REIT
but  for the  fact that Section  856(h)(3) of the  Code (added by  the 1993 Act)
provides that stock owned by qualified trusts shall be treated, for purposes  of
the  "not closely held" requirement, as owned  by the beneficiaries of the trust
(rather than  by the  trust  itself), AND  (ii) EITHER  (a)  at least  one  such
qualified  trust holds more than 25% (by value) of the interests in the REIT, OR
(b) one or  more such qualified  trusts, each of  which owns more  than 10%  (by
value)  of the interests  in the REIT, hold  in the aggregate  more than 50% (by
value) of the interests in the REIT. The percentage of any REIT dividend treated
as   UBTI   is   equal   to   the   ratio   of   (i)   the   UBTI   earned    by
 
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<PAGE>
the  REIT  (treating the  REIT as  if it  were a  qualified trust  and therefore
subject to tax on UBTI) to (ii) the total gross income of the REIT. A DE MINIMIS
exception applies  where  the percentage  is  less than  5%  for any  year.  The
provisions  requiring qualified trusts to treat  a portion of REIT distributions
as UBTI will not  apply if the REIT  is able to satisfy  the "not closely  held"
requirement  without relying upon  the "look-through" exception  with respect to
qualified trusts. As a result of  certain limitations on transfer and  ownership
of  Common Stock  contained in the  Charter, the  Company does not  expect to be
classified as a "pension held REIT."
 
TAXATION OF NON-U.S. STOCKHOLDERS
 
    The rules governing United States  federal income taxation of the  ownership
and  disposition of stock  by persons that  are, for purposes  of such taxation,
nonresident alien  individuals, foreign  corporations, foreign  partnerships  or
foreign  estates or trusts (collectively,  "Non-U.S. Stockholders") are complex,
and no attempt  is made  herein to  provide more than  a brief  summary of  such
rules. Accordingly, the discussion does not address all aspects of United States
federal income tax and does not address state, local or foreign tax consequences
that  may  be relevant  to a  Non-U.S.  Stockholder in  light of  its particular
circumstances. In addition, this  discussion is based on  current law, which  is
subject  to change,  and assumes  that the Company  qualifies for  taxation as a
REIT. Prospective  Non-U.S.  Stockholders  should consult  with  their  own  tax
advisers to determine the impact of federal, state, local and foreign income tax
laws  with  regard to  an investment  in Common  Stock, including  any reporting
requirements.
 
    DISTRIBUTIONS.  Distributions by the Company to a Non-U.S. Stockholder  that
are  neither attributable  to gain  from sales  or exchanges  by the  Company of
United States real property interests nor  designated by the Company as  capital
gains  dividends will be treated  as dividends of ordinary  income to the extent
that they are made  out of current  or accumulated earnings  and profits of  the
Company.  Such distributions ordinarily will be subject to withholding of United
States federal  income tax  on a  gross  basis (that  is, without  allowance  of
deductions)  at  a  30% rate  or  such lower  rate  as  may be  specified  by an
applicable income tax treaty,  unless the dividends  are treated as  effectively
connected  with the conduct by the Non-U.S. Stockholder of a United States trade
or business.  Dividends that  are effectively  connected with  such a  trade  or
business  will be  subject to tax  on a net  basis (that is,  after allowance of
deductions) at graduated rates, in the same manner as domestic stockholders  are
taxed  with  respect  to  such  dividends  and  are  generally  not  subject  to
withholding. Any such  dividends received by  a Non-U.S. Stockholder  that is  a
corporation  may also be  subject to an  additional branch profits  tax at a 30%
rate or such lower rate as may be specified by an applicable income tax treaty.
 
    Pursuant to current Treasury Regulations, dividends paid to an address in  a
country  outside  the United  States  are generally  presumed  to be  paid  to a
resident of  such  country for  purposes  of determining  the  applicability  of
withholding  discussed above and  the applicability of a  tax treaty rate. Under
proposed Treasury  Regulations, not  currently in  effect, however,  a  Non-U.S.
Stockholder  who wished to claim the benefit  of an applicable treaty rate would
be required  to  satisfy certain  certification  and other  requirements.  Under
certain  treaties, lower withholding rates  generally applicable to dividends do
not apply to dividends from a  REIT, such as the Company. Certain  certification
and  disclosure requirements  must be  satisfied to  be exempt  from withholding
under the effectively connected income exemption discussed above.
 
    Distributions in excess of  current or accumulated  earnings and profits  of
the  Company will not  be taxable to  a Non-U.S. Stockholder  to the extent that
they do not exceed  the adjusted basis of  the stockholders's Common Stock,  but
rather  will reduce the  adjusted basis of  such stock. To  the extent that such
distributions exceed  the  adjusted basis  of  a Non-U.S.  Stockholder's  Common
Stock,  they will give rise to gain from  the sale or exchange of his stock, the
tax treatment of which  is described below.  If it cannot  be determined at  the
time  a distribution is made whether or  not such distribution will be in excess
of current or accumulated earnings and profits, the distribution will  generally
be  treated  as  a  dividend for  withholding  purposes.  However,  amounts thus
withheld are generally refundable  by the IRS if  it is subsequently  determined
that  such  distribution  was, in  fact,  in  excess of  current  or accumulated
earnings and profits of the Company.
 
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<PAGE>
    Distributions to a Non-U.S. Stockholder  that are designated by the  Company
at the time of distribution as capital gains dividends (other than those arising
from  the disposition of a United  States real property interest) generally will
not be subject to United States  federal income taxation, unless (i)  investment
in  the Common  Stock is effectively  connected with  the Non-U.S. Stockholder's
United States trade or business, in which case the Non-U.S. Stockholder will  be
subject to the same treatment as domestic stockholders with respect to such gain
(except  that a stockholder that is a foreign corporation may also be subject to
the  30%  branch  profits  tax,  as  discussed  above),  or  (ii)  the  Non-U.S.
Stockholder  is  a nonresident  alien individual  who is  present in  the United
States for 183 days or more during the taxable year and has a "tax home" in  the
United States, in which case the nonresident alien individual will be subject to
a 30% tax on the individual's capital gains.
 
    Distributions  to a Non-U.S. Stockholder that  are attributable to gain from
sales or exchanges by the Company of United States real property interests  will
cause  the Non-U.S. Stockholder to be treated as recognizing such gain as income
effectively  connected  with  a  United  States  trade  or  business.   Non-U.S.
Stockholders  would  thus generally  be taxed  at the  same rates  applicable to
domestic stockholders (subject to a special alternative minimum tax in the  case
of  nonresident alien  individuals). Also,  such gain  may be  subject to  a 30%
branch profits tax in the hands of a Non-U.S. Stockholder that is a corporation,
as discussed  above.  The  Company is  required  to  withhold 35%  of  any  such
distribution.  That  amount  is creditable  against  the  Non-U.S. Stockholder's
United States federal income tax liability.
 
    SALE OF COMMON STOCK.   Gain recognized by  a Non-U.S. Stockholder upon  the
sale  or exchange  of shares of  Common Stock  generally will not  be subject to
United States  taxation unless  such  shares constitute  a "United  States  real
property  interest"  within the  meaning of  FIRPTA. The  Common Stock  will not
constitute a "United States real property interest" so long as the Company is  a
"domestically  controlled REIT." A  "domestically controlled REIT"  is a REIT in
which at all times during a specified  testing period less than 50% in value  of
its  stock is held directly or  indirectly by Non-U.S. Stockholders. The Company
believes that  at  the  closing of  the  Offering  it will  be  a  "domestically
controlled REIT," and therefore that the sale of shares of Common Stock will not
be subject to taxation under FIRPTA. However, because the shares of Common Stock
will  be  publicly traded,  no  assurance can  be  given that  the  Company will
continue to be a "domestically-controlled REIT." Notwithstanding the  foregoing,
gain  from the sale or exchange of  shares of Common Stock not otherwise subject
to FIRPTA will be taxable to a Non-U.S. Stockholder if the Non-U.S.  Stockholder
is  a nonresident alien individual  who is present in  the United States for 183
days or more during the taxable year and has a "tax home" in the United  States.
In  such case, the nonresident alien individual  will be subject to a 30% United
States withholding tax on the amount of such individual's gain.
 
    If   the   Company   does   not   qualify    as   or   ceases   to   be    a
"domestically-controlled  REIT," whether gain arising  from the sale or exchange
by a Non-U.S. Stockholder of shares of  Common Stock would be subject to  United
States  taxation  under FIRPTA  as  a sale  of  a "United  States  real property
interest" will depend on whether the  shares are "regularly traded" (as  defined
by  applicable Treasury Regulations) on  an established securities market (E.G.,
the  New  York  Stock  Exchange)  and  on  the  size  of  the  selling  Non-U.S.
Stockholder's interest in the Company. If gain on the sale or exchange of shares
of  Common Stock were subject to taxation under FIRPTA, the Non-U.S. Stockholder
would be subject to regular United States  income tax with respect to such  gain
in  the same manner as a U.S. Stockholder (subject to any applicable alternative
minimum tax, a special alternative minimum tax in the case of nonresident  alien
individuals  and the possible application  of the 30% branch  profits tax in the
case of foreign corporations), and the purchaser of the stock would be  required
to withhold and remit to the IRS 10% of the purchase price.
 
    BACKUP  WITHHOLDING TAX AND  INFORMATION REPORTING.   Backup withholding tax
(which generally is  a withholding tax  imposed at  the rate of  31% on  certain
payments  to persons that  fail to furnish certain  information under the United
States  information  reporting  requirements)  and  information  reporting  will
generally  not apply to distributions paid  to Non-U.S. Stockholders outside the
United States that are  treated as (i)  dividends subject to  the 30% (or  lower
treaty  rate) withholding tax  discussed above, (ii)  capital gains dividends or
(iii) distributions  attributable to  gain  from the  sale  or exchange  by  the
Company  of United States  real property interests. As  a general matter, backup
withholding and  information  reporting will  not  apply  to a  payment  of  the
proceeds  of a sale of Common Stock by  or through a foreign office of a foreign
 
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broker. Information reporting (but not backup withholding) will apply,  however,
to  a payment of the proceeds of a sale of Common Stock by a foreign office of a
broker that (a) is a United States person, (b) derives 50% or more of its  gross
income for certain periods from the conduct of a trade or business in the United
States  or  (c)  is a  "controlled  foreign corporation"  (generally,  a foreign
corporation controlled  by United  States stockholders)  for United  States  tax
purposes,  unless the  broker has documentary  evidence in its  records that the
holder is a Non-U.S.  Stockholder and certain other  conditions are met, or  the
stockholder  otherwise establishes an exemption. Payment  to or through a United
States office of a broker of the proceeds  of a sale of Common Stock is  subject
to  both  backup withholding  and information  reporting unless  the stockholder
certifies  under  penalty  of  perjury  that  the  stockholder  is  a   Non-U.S.
Stockholder,  or otherwise establishes an  exemption. A Non-U.S. Stockholder may
obtain a refund of  any amounts withheld under  the backup withholding rules  by
filing the appropriate claim for refund with the IRS.
 
    The   United  States  Treasury  has  recently  issued  proposed  regulations
regarding the withholding  and information reporting  rules discussed above.  In
general,  the proposed regulations do not  alter the substantive withholding and
information reporting requirements  but unify  current certification  procedures
and  forms  and clarify  and modify  reliance standards.  If finalized  in their
current form, the proposed regulations would generally be effective for payments
made after December 31, 1997, subject to certain transition rules.
 
TAX ASPECTS OF THE OPERATING PARTNERSHIP
 
    GENERAL.
 
    Substantially all  of  the Company's  investments  will be  held  indirectly
through  the Operating Partnership. In  general, partnerships are "pass-through"
entities which  are not  subject to  federal income  tax. Rather,  partners  are
allocated  their  proportionate  shares  of the  items  of  income,  gain, loss,
deduction and  credit of  a  partnership, and  are  potentially subject  to  tax
thereon,  without regard to whether the partners receive a distribution from the
partnership. The Company will include in  its income its proportionate share  of
the  foregoing partnership items  for purposes of the  various REIT income tests
and in the computation of its REIT taxable income. Moreover, for purposes of the
REIT asset tests,  the Company will  include its proportionate  share of  assets
held by the Operating Partnership. See " -- Taxation of the Company."
 
    ENTITY  CLASSIFICATION.  The Company's interest in the Operating Partnership
involves special tax considerations, including the possibility of a challenge by
the IRS of the status of the Operating Partnership as a partnership (as  opposed
to  an association taxable as a corporation) for federal income tax purposes. If
the Operating Partnership were treated as an association, it would be taxable as
a corporation and therefore be subject to an entity-level tax on its income.  In
such  a situation,  the character  of the  Company's assets  and items  of gross
income would change and preclude the Company from satisfying the asset tests and
possibly the income tests (see " -- Taxation of the Company -- Asset Tests"  and
"  -- Income Tests"), and in turn would prevent the Company from qualifying as a
REIT. See  " --  Taxation of  the Company  -- Failure  to Qualify"  above for  a
discussion  of the  effect of  the Company's  failure to  meet such  tests for a
taxable year. In addition,  a change in the  Operating Partnership's status  for
tax purposes might be treated as a taxable event in which case the Company might
incur a tax liability without any related cash distributions.
 
    An organization formed as a partnership will be treated as a partnership for
federal  income tax purposes rather than as a corporation only if it has no more
than two of the four corporate characteristics that the Treasury Regulations use
to distinguish a  partnership from a  corporation for tax  purposes. These  four
characteristics  are (i) continuity of  life, (ii) centralization of management,
(iii) limited liability and (iv) free transferability of interests. The  Company
has  not requested, and does  not intend to request, a  ruling from the IRS that
the Operating Partnership will  be treated as a  partnership for federal  income
tax  purposes.  However,  in  connection  with  the  closing  of  the  Formation
Transactions, Latham  &  Watkins  will  deliver  an  opinion  to  the  Operating
Partnership  stating that based  on the provisions  of the Partnership Agreement
and certain factual  assumptions and representations  described in the  opinion,
the  Operating Partnership will  be treated as a  partnership for federal income
tax purposes (and not as an association or a publicly traded partnership taxable
as a corporation). Unlike a private letter ruling, an opinion of counsel is  not
binding  on  the IRS,  and  no assurance  can  be given  that  the IRS  will not
challenge the status of the Operating  Partnership as a partnership for  federal
income  tax purposes. If such challenge were sustained by a court, the Operating
Partnership could be treated as a corporation for federal income tax purposes.
 
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<PAGE>
    Recently proposed  Treasury  Regulations (the  "Proposed  Regulations"),  if
finalized  in their present form, would eliminate the four factor test described
above and, in its  place, permit a partnership  or limited liability company  to
elect  to be  taxed as  a partnership  for federal  income tax  purposes without
regard to the number of corporate characteristics possessed by such entity.  The
Proposed Regulations are proposed to apply for tax periods beginning on or after
the  date that final regulations are published  by the IRS. Until that time, the
existing regulations will  continue to apply.  The Proposed Regulations  provide
that the IRS will not challenge the classification of an existing partnership or
limited  liability  company  for  tax periods  to  which  the  existing Treasury
Regulations apply  if (1)  the entity  had a  reasonable basis  for its  claimed
classification,  (2) the  entity claimed that  same classification  in all prior
years, and (3)  as of  the date that  the proposed  regulations were  published,
neither  the entity nor  any member of  the entity had  been notified in writing
that the classification of the entity is under examination by the IRS.
 
    PARTNERSHIP ALLOCATIONS.   Although a partnership  agreement will  generally
determine  the allocation  of income and  loss among  partners, such allocations
will be disregarded for tax purposes if  they do not comply with the  provisions
of  Section  704(b)  of  the  Code  and  the  Treasury  Regulations  promulgated
thereunder. Generally, Section 704(b)  and the Treasury Regulations  promulgated
thereunder require that partnership allocations respect the economic arrangement
of the partners.
 
    If an allocation is not recognized for federal income tax purposes, the item
subject  to the allocation will be  reallocated in accordance with the partners'
interests in the partnership,  which will be determined  by taking into  account
all  of the facts and circumstances relating  to the economic arrangement of the
partners with respect to such  item. The Operating Partnership's allocations  of
taxable  income and loss are intended to comply with the requirements of Section
704(b) of the Code and the Treasury Regulations promulgated thereunder.
 
    The Partnership  Agreement provides  that  net income  or  net loss  of  the
Operating Partnership will generally be allocated to the Company and the Limited
Partners  in  accordance  with  their  respective  percentage  interests  in the
Operating Partnership. Notwithstanding  the foregoing,  such agreement  provides
that  certain  interest  deductions and  income  from the  discharge  of certain
indebtedness of the Operating Partnership, attributable to loans transferred  to
the   Operating   Partnership   by  Arden   Predecessors,   will   be  allocated
disproportionately to  the Limited  Partners. In  addition, allocations  of  net
income or net loss will be subject to compliance with the provisions of Sections
704(b)  and  704(c)  of  the  Code  and  the  Treasury  Regulations  promulgated
thereunder.
 
    TAX ALLOCATIONS WITH RESPECT TO THE PROPERTIES.  Pursuant to Section  704(c)
of  the Code,  income, gain, loss  and deduction attributable  to appreciated or
depreciated  property  (such  as  the  Properties)  that  is  contributed  to  a
partnership in exchange for an interest in the partnership, must be allocated in
a  manner such that the contributing partner  is charged with, or benefits from,
respectively, the  unrealized  gain  or  unrealized  loss  associated  with  the
property  at the time of the contribution. The amount of such unrealized gain or
unrealized loss is  generally equal to  the difference between  the fair  market
value  of contributed property at the time  of contribution and the adjusted tax
basis of such property at such time (a "Book-Tax Difference"). Such  allocations
are  solely for federal income  tax purposes and do  not affect the book capital
accounts or  other  economic  or  legal arrangements  among  the  partners.  The
Operating Partnership was formed by way of contributions of appreciated property
(including  the  Properties). Consequently,  the Partnership  Agreement requires
that such allocations be made in a manner consistent with Section 704(c) of  the
Code.
 
    In  general,  the  Limited Partners  of  the Operating  Partnership  will be
allocated depreciation deductions  for tax  purposes which are  lower than  such
deductions would be if determined on a pro rata basis. In addition, in the event
of  the  disposition of  any of  the  contributed assets  which have  a Book-Tax
Difference, all income attributable to  such Book-Tax Difference will  generally
be  allocated  to  such limited  partners,  and  the Company  will  generally be
allocated only its share of capital gains attributable to appreciation, if  any,
occurring  after the  closing of the  Formation Transactions. This  will tend to
eliminate the Book-Tax Difference  over the life  of the Operating  Partnership.
However,  the special allocation rules of  Section 704(c) do not always entirely
eliminate the  Book-Tax Difference  on an  annual  basis or  with respect  to  a
specific taxable
 
                                      117
<PAGE>
transaction  such as a sale. Thus, the carryover basis of the contributed assets
in the hands  the Operating Partnership  may cause the  Company to be  allocated
lower  depreciation  and other  deductions, and  possibly  an amount  of taxable
income in  the event  of a  sale of  such contributed  assets in  excess of  the
economic or book income allocated to it as a result of such sale. This may cause
the  Company to recognize taxable income in excess of cash proceeds, which might
adversely affect  the Company's  ability to  comply with  the REIT  distribution
requirements.   See  "  --  Taxation  of  the  Company  --  Annual  Distribution
Requirements."
 
    Treasury Regulations under Section 704(c)  of the Code provide  partnerships
with  a  choice  of  several methods  of  accounting  for  Book-Tax Differences,
including retention  of the  "traditional  method" or  the election  of  certain
methods which would permit any distortions caused by a Book-Tax Difference to be
entirely  rectified on  an annual  basis or with  respect to  a specific taxable
transaction such as a sale. The  Operating Partnership and the Company have  not
yet  selected a method to  account for Book-Tax Differences  with respect to the
Properties initially contributed to the Operating Partnership.
 
    With  respect  to  any  property  purchased  by  the  Operating  Partnership
subsequent  to the admission  of the Company to  the Operating Partnership, such
property will initially have  a tax basis  equal to its  fair market value,  and
Section 704(c) of the Code will not apply.
 
    BASIS  IN OPERATING PARTNERSHIP INTEREST.   The Company's adjusted tax basis
in its interest in the Operating Partnership generally (i) will be equal to  the
amount  of cash and the basis of any other property contributed to the Operating
Partnership by the Company, (ii) will be increased by (a) its allocable share of
the Operating Partnership's income and  (b) its allocable share of  indebtedness
of  the Operating Partnership and (iii) will  be reduced, but not below zero, by
the  Company's  allocable  share  of  (a)  losses  suffered  by  the   Operating
Partnership,  (b)  the amount  of cash  distributed  to the  Company and  (c) by
constructive distributions resulting from a reduction in the Company's share  of
indebtedness of the Operating Partnership.
 
    If  the  allocation of  the Company's  distributive  share of  the Operating
Partnership's loss exceeds the adjusted  tax basis of the Company's  partnership
interest  in the Operating Partnership, the recognition of such excess loss will
be deferred until such time and to the extent that the Company has adjusted  tax
basis  in its  interest in  the Operating  Partnership. To  the extent  that the
Operating Partnership's distributions, or any decrease in the Company's share of
the indebtedness of the Operating Partnership (such decreases being considered a
constructive cash distribution to the partners), exceeds the Company's  adjusted
tax basis, such excess distributions (including such constructive distributions)
constitute  taxable income to the Company.  Such taxable income will normally be
characterized as a capital gain, and if the Company's interest in the  Operating
Partnership  has been  held for longer  than the long-term  capital gain holding
period (currently one year),  such distributions and constructive  distributions
will constitute long-term capital gain.
 
OTHER TAX CONSEQUENCES
 
    The  Company and its stockholders may be  subject to state or local taxation
in various state  or local jurisdictions,  including those in  which it or  they
transact  business or reside. The  state and local tax  treatment of the Company
and its stockholders  may not  conform to  the federal  income tax  consequences
discussed above. Consequently, prospective stockholders should consult their own
tax  advisors regarding the effect of state  and local tax laws on an investment
in the Company.
 
                              ERISA CONSIDERATIONS
 
    THE FOLLOWING IS A  SUMMARY OF MATERIAL  CONSIDERATIONS ARISING UNDER  ERISA
AND  THE PROHIBITED TRANSACTIONS PROVISIONS OF SECTION 4975 OF THE CODE THAT MAY
BE RELEVANT TO A PROSPECTIVE PURCHASER (INCLUDING WITH RESPECT TO THE DISCUSSION
CONTAINED IN "  -- STATUS  OF THE COMPANY  AND THE  OPERATING PARTNERSHIP  UNDER
ERISA,"  TO A PROSPECTIVE PURCHASER THAT IS NOT AN EMPLOYEE BENEFIT PLAN SUBJECT
TO ERISA, ANOTHER TAX-QUALIFIED PENSION, PROFIT SHARING OR STOCK BONUS PLAN,  OR
AN  INDIVIDUAL RETIREMENT ACCOUNT  OR ANNUITY ("IRA")).  THE DISCUSSION DOES NOT
PURPORT TO DEAL WITH ALL ASPECTS OF ERISA  OR SECTION 4975 OF THE CODE THAT  MAY
BE  RELEVANT TO  PARTICULAR PROSPECTIVE  PURCHASERS (INCLUDING  EMPLOYEE BENEFIT
PLANS SUBJECT  TO  ERISA,  OTHER  TAX-QUALIFIED  PLANS  AND  IRAS)  OR  MATERIAL
CONSIDERATIONS  RELATING TO PROSPECTIVE PURCHASERS  THAT ARE GOVERNMENTAL PLANS,
CHURCH PLANS  OR OTHER  EMPLOYEE BENEFIT  PLANS THAT  ARE EXEMPT  FROM ERISA  OR
SECTION  4975 OF THE CODE  BUT THAT MAY BE SUBJECT  TO STATE LAW REQUIREMENTS IN
LIGHT OF THEIR PARTICULAR CIRCUMSTANCES.
 
                                      118
<PAGE>
    A FIDUCIARY MAKING THE DECISION TO INVEST  IN SHARES OF THE COMMON STOCK  ON
BEHALF  OF A PROSPECTIVE PURCHASER WHICH IS  AN EMPLOYEE BENEFIT PLAN SUBJECT TO
ERISA, A TAX-QUALIFIED PENSION,  PROFIT SHARING OR STOCK  BONUS PLAN, AN IRA,  A
CHURCH  PLAN OR A GOVERNMENTAL PLAN IS  ADVISED TO CONSULT ITS OWN LEGAL ADVISOR
REGARDING THE SPECIFIC CONSIDERATIONS ARISING  UNDER ERISA, SECTION 4975 OF  THE
CODE,  AND STATE LAW WITH RESPECT TO  THE PURCHASE, OWNERSHIP, OR SALE OF SHARES
OF THE COMMON STOCK BY SUCH PLAN OR IRA.
 
EMPLOYMENT BENEFIT PLANS, TAX-QUALIFIED PENSION, PROFIT SHARING OR STOCK BONUS
PLANS AND IRAS
 
    Each fiduciary  of an  employee benefit  plan subject  to ERISA  (an  "ERISA
Plan")  should carefully consider  whether an investment in  the Common Stock is
consistent with its fiduciary responsibilities  under ERISA. In particular,  the
fiduciary  requirements of Part  4 of Title  I of ERISA  require an ERISA Plan's
investments to  be (i)  prudent and  in the  interests of  the participants  and
beneficiaries  of the ERISA Plan, (ii) diversified in order to minimize the risk
of large losses, unless it is clearly prudent not to do so and (iii)  authorized
under  the terms of  the governing documents  of the ERISA  Plan. In addition, a
fiduciary of an ERISA Plan should not cause or permit to enter into transactions
prohibited under  Section  406  of  ERISA  or  Section  4975  of  the  Code.  In
determining whether an investment in the Common Stock is prudent for purposes of
ERISA,  the appropriate fiduciary  of an ERISA  Plan should consider  all of the
facts  and  circumstances,  including  whether  the  investment  is   reasonably
designed,  as a  part of  the ERISA  Plan's investment  portfolio for  which the
fiduciary has responsibility, to meet the  objectives of the ERISA Plan,  taking
into  consideration the risk of loss and  opportunity for gain (or other return)
from the investment, the diversification, cash flow and funding requirements  of
the  ERISA  Plan, and  the  liquidity and  current  return of  the  ERISA Plan's
investment portfolio. A fiduciary  should also take into  account the nature  of
the Company's business, the length of the Company's operating history, the terms
of  the Management Agreements,  the fact that  certain investment properties may
not have been identified yet, other  matters described under "Risk Factors"  and
the  possibility of UBTI. See "Federal  Income Tax Considerations -- Taxation of
Stockholders."
 
    The fiduciary  of an  ERISA Plan,  an  IRA or  a qualified  pension,  profit
sharing  or stock bonus plan not subject to ERISA (a "Non-ERISA Plan") should be
subject to  Section 4975  of the  Code ("Other  Plans") should  ensure that  the
purchase  of Common  Stock will not  constitute a  prohibited transactions under
ERISA or the Code.
 
STATUS OF THE COMPANY AND THE OPERATING PARTNERSHIP UNDER ERISA
 
    THE FOLLOWING SECTION DISCUSSES CERTAIN PRINCIPLES THAT APPLY IN DETERMINING
WHETHER THE  FIDUCIARY  REQUIREMENTS OF  ERISA  AND THE  PROHIBITED  TRANSACTION
PROVISIONS  OF  ERISA  AND THE  CODE  APPLY TO  AN  ENTITY BECAUSE  ONE  OR MORE
INVESTORS IN THE ENTITY'S EQUITY  INTERESTS IS AN ERISA  PLAN OR OTHER PLAN.  AN
ERISA  PLAN FIDUCIARY SHOULD ALSO CONSIDER  THE RELEVANCE OF THESE PRINCIPLES TO
ERISA'S PROHIBITION ON IMPROPER DELEGATION OF CONTROL OVER OR RESPONSIBILITY FOR
"PLAN ASSETS" AND ERISA'S  IMPOSITION OF CO-FIDUCIARY  LIABILITY ON A  FIDUCIARY
WHO PARTICIPATES IN, PERMITS (BY ACTION OR INACTION) THE OCCURRENCE OF, OR FAILS
TO REMEDY A KNOWN BREACH BY ANOTHER FIDUCIARY.
 
    If  the assets of  the Company are deemed  to be assets of  an ERISA Plan or
Other Plan ("plan assets"), (i) the  prudence standards and other provisions  of
Part  4 of Title I  of ERISA and the  prohibited transaction provisions of ERISA
and the Code  would be applicable  to any transactions  involving the  Company's
assets and (ii) persons who exercise any authority or control over the Company's
assets,  or who provide investment advice to the Company, would be (for purposes
of ERISA and the Code) fiduciaries of  ERISA Plans and Other Plans that  acquire
Common   Stock.  The  Department  of  Labor   (the  "DOL"),  which  has  certain
administrative responsibility over  ERISA Plans  and Other Plans,  has issued  a
regulation defining plan assets for certain purposes (the "DOL Regulation"). The
DOL Regulation generally provides that when an ERISA Plan or Other Plan acquires
a  security that is an equity interest in an entity and that security is neither
a "publicly-offered security"  nor a  security issued by  an investment  company
registered  under  the 1940  Act, the  assets of  the ERISA  Plan or  Other Plan
include both  the equity  interest and  an  undivided interest  in each  of  the
underlying assets of the entity, unless it is established either that the entity
is  an "operating  company" (as  defined in the  DOL Regulation)  or that equity
participation in the entity by "benefit plan investors" is not "significant."
 
                                      119
<PAGE>
    The DOL Regulation defines a "publicly-offered security" as a security  that
is "widely held," "freely transferable" and either part of a class of securities
registered under the Exchange Act, or sold pursuant to an effective registration
statement under the Securities Act (provided the securities are registered under
the  Exchange Act within 120 days,  or such later time as  may be allowed by the
SEC (the "registration period"), after the end of the fiscal year of the  issuer
during  which  the offering  occurred). The  Common  Stock is  being sold  in an
offering registered under the Securities Act and the Company intends to register
the Common Stock under the Exchange Act within the registration period.
 
    The DOL Regulation provides that a  security is "widely-held" only if it  is
part of a class of securities that is owned by 100 or more investors independent
of  the issuer and of one another. A  security will not fail to be "widely held"
because the number of  independent investors falls below  100 subsequent to  the
initial  public offering as a result of  events beyond the issuer's control. The
Company expects the  Common Stock  to be "widely  held" upon  completion of  the
Offering.
 
    The DOL Regulation provides that whether a security is "freely transferable"
is  a factual question to  be determined on the basis  of all relevant facts and
circumstances. The DOL Regulation further provides that where a security is part
of an  offering in  which the  minimum investment  is $10,000  or less,  certain
restrictions ordinarily will not, alone or in combination, affect a finding that
such  securities  are  "freely transferable."  The  Offering will  not  impose a
minimum investment requirement. The restrictions  on transfer enumerated in  the
DOL  Regulation as  ordinarily not affecting  a finding that  the securities are
"freely transferable" include: (i) any restriction on or prohibition against any
transfer or assignment that would result in a termination or reclassification of
the Company for federal or state  tax purposes, or that would otherwise  violate
any  state or  federal law  or court  order, (ii)  any requirement  that advance
notice of  a  transfer  or  assignment  be  given  to  the  Company,  (iii)  any
requirement   that  either  the  transferor  or  transferee,  or  both,  execute
documentation  setting  forth   representations  as  to   compliance  with   any
restrictions  on transfer that are among  those enumerated in the DOL Regulation
as not affecting  free transferability, (iv)  any administrative procedure  that
establishes  an effective date, or an event (such as completion of the Offering)
prior to  which  a  transfer  or  assignment will  not  be  effective,  (v)  any
prohibition  against  transfer  or  assignment to  an  ineligible  or unsuitable
investor, and (vi) any limitation or restriction on transfer or assignment  that
is  not imposed by  the issuer or a  person acting on behalf  of the issuer. The
Company believes that the restrictions imposed under the Charter on the transfer
of Common Stock are of the type of restrictions on transfer generally  permitted
under  the DOL Regulation or are not otherwise material and should not result in
the failure of the Common Stock  to be "freely transferable" within the  meaning
of  the DOL  Regulation. See  "Capital Stock  -- Restrictions  on Transfer." The
Company also believes that certain restrictions on transfer that derive from the
securities  laws,  from  contractual  arrangements  with  the  Underwriters   in
connection  with the Offering  and from certain provisions  should not result in
the failure of the Common Stock to be "freely transferable." See  "Underwriting"
and  "Certain Provisions of Maryland Law  and the Company's Charter and Bylaws."
Furthermore, the  Company is  not  aware of  any  other facts  or  circumstances
limiting  the transferability  of the Common  Stock that are  not included among
those enumerated  as not  affecting  their free  transferability under  the  DOL
Regulation,  and the  Company does  not expect  to impose  in the  future (or to
permit any person to impose on its behalf) any other limitations or restrictions
on transfer that would  not be among the  enumerated permissible limitations  or
restrictions.
 
    Assuming  that the Company registers the Common Stock under the Exchange Act
within the registration period, the Common Stock will be "widely held" and  that
no  facts  and  circumstances other  than  those  referred to  in  the preceding
paragraph exist that restrict transferability  of the Common Stock, the  Company
believes   that,  under  the   DOL  Regulation,  the   Common  Stock  should  be
"publicly-offered securities" and,  therefore, that  the assets  of the  Company
should  not be deemed  to be plan  assets of any  ERISA Plan or  Other Plan that
invests in the Common Stock.
 
    The DOL Regulation will also apply in determining whether the assets of  the
Operating  Partnership  will  be  deemed  to  be  plan  assets.  The partnership
interests in the Operating Partnership will not be publicly offered  securities.
Nevertheless,  if the Common Stock  constitutes publicly offered securities, the
Company believes that the  indirect investment in  the Operating Partnership  by
ERISA  Plans or Other Plans through their ownership of the Common Stock will not
cause the assets of the Operating Partnership to be treated as plan assets.
 
                                      120
<PAGE>
                                  UNDERWRITING
 
    The  underwriters  of the  Offering  (the "Underwriters"),  for  whom Lehman
Brothers Inc.,  Alex. Brown  &  Sons Incorporated,  Dean Witter  Reynolds  Inc.,
EVEREN  Securities,  Inc. and  Raymond James  & Associates,  Inc. are  acting as
representatives (the "Representatives"), have  severally agreed, subject to  the
conditions  contained in the Underwriting Agreement  (the form of which is filed
as an exhibit  to the Registration  Statement of which  this Prospectus forms  a
part),  to purchase from the Company and the  Company has agreed to sell to each
Underwriter, the aggregate number of shares  of Common Stock set forth  opposite
the name of each such Underwriter.
 
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
UNDERWRITER                                                                          SHARES
- --------------------------------------------------------------------------------  ------------
<S>                                                                               <C>
Lehman Brothers Inc.............................................................
Alex. Brown & Sons Incorporated.................................................
Dean Witter Reynolds Inc........................................................
Smith Barney Inc................................................................
EVEREN Securities, Inc..........................................................
Raymond James & Associates, Inc.................................................
                                                                                  ------------
  Total.........................................................................    18,725,000
                                                                                  ------------
                                                                                  ------------
</TABLE>
 
    The  Underwriting  Agreement provides  that the  obligations of  the several
Underwriters  to  purchase  shares  of  Common  Stock  are  subject  to  certain
conditions,  and that if any of the shares  of Common Stock are purchased by the
Underwriters pursuant to the Underwriting Agreement, all of the shares agreed to
be purchased by  the Underwriters under  the Underwriting Agreement  must be  so
purchased.
 
    The  Company has been advised that  the Underwriters propose to offer shares
of Common Stock directly  to the public initially  at the public offering  price
set  forth on the cover page of this Prospectus, and to certain selected dealers
who may include the  Underwriters at such public  offering price less a  selling
concession not in excess of $      per share. The selected dealers may reallow a
concession  not in excess  of $        per share to  certain brokers or dealers.
After the  Offering,  the public  offering  price, the  concession  to  selected
dealers, and the reallowance may be changed by the Representatives.
 
    The  Company  has  agreed  to  indemnify  the  Underwriters  against certain
liabilities, including liabilities under the Securities Act, or to contribute to
the payments they may be required to make in respect thereto.
 
    The Company has granted to the Underwriters  an option to purchase up to  an
additional  2,808,000 shares of Common Stock, at the public offering price, less
the aggregate underwriting discounts and commissions, shown on the cover page of
this Prospectus, solely  to cover  overallotments, if  any. Such  option may  be
exercised  at  any  time within  30  days  after the  date  of  the Underwriting
Agreement. To the extent that such option is exercised, each Underwriter will be
committed, subject to certain conditions, to purchase a number of the additional
shares of Common Stock proportionate to such Underwriter's initial commitment as
indicated in the preceding table.
 
    Prior to the Offering, there has been no public market for the Common Stock.
The initial  public  offering  price will  be  determined  through  negotiations
between  the Company and the Representatives. Among the factors to be considered
in  such  negotiations,  in  addition  to  prevailing  market  conditions,   are
distribution  rates and financial characteristics  of publicly traded REITs that
the Company and the Representatives believe to be comparable to the Company, the
expected results of operations of the Company (which are based on the results of
operations of the Properties and the fee management business in recent periods),
estimates of future business potential and earnings prospects of the Company  as
a whole and the current state of the real estate market in the Company's primary
markets  and the economy as  a whole. The initial price  per share to the public
set forth  on  the  cover  page  of this  Prospectus  should  not,  however,  be
considered  an indication of the actual value of the Common Stock. Such price is
subject to changes as a result of market conditions and other factors.
 
                                      121
<PAGE>
    The Underwriters  do not  intend to  confirm sales  of Common  Stock to  any
account over which they exercise discretionary authority.
 
    Lehman  Brothers Holdings Inc.,  an affiliate of  Lehman Brothers Inc., will
receive approximately $303 million (67.7% of the net proceeds from the  Offering
and  the Mortgage Financing)  as repayment of  indebtedness and related interest
expected to  be outstanding  upon  consummation of  the  Offering. See  "Use  of
Proceeds."
 
    In  connection with the Offering, Messrs.  Ziman and Coleman have agreed not
to sell any shares of  Common Stock acquired by them  upon exchange of OP  Units
for  a period  of two  years after  the completion  of the  Offering without the
consent of Lehman Brothers Inc. Such restrictions will not apply to any OP Units
or other shares of Common Stock purchased or otherwise acquired by Messrs. Ziman
or Coleman following consummation of the Offering.
 
    The Company  has agreed  for a  period of  180 days  from the  date of  this
Prospectus,  not to, directly  or indirectly, offer for  sale, sell or otherwise
dispose of (or enter  into any transaction  or device which  is designed to,  or
could be expected to, result in the disposition by any person at any time in the
future  of) shares  of Common  Stock (other than  the shares  offered hereby and
shares issued pursuant to the Stock Incentive Plan existing on the date  hereof)
or  sell or  grant options,  rights or  warrants with  respect to  any shares of
Common Stock (other than  the grant of options  pursuant to the Stock  Incentive
Plan  existing on the date hereof), without  the prior written consent of Lehman
Brothers Inc.
 
    The Company has agreed to pay Lehman Brothers Inc. an advisory fee equal  to
  % of the gross proceeds received from the sale of Common Stock of the Offering
for  advisory services rendered in connection  with the evaluation, analysis and
structuring of the Company's formation and the Offering.
 
    Although the  Conduct  Rules  of  the  National  Association  of  Securities
Dealers,  Inc. exempt  REITs from the  conflict of  interest provisions thereof,
because an affiliate of Lehman Brothers Inc.  will receive more than 10% of  the
net proceeds of the Offering in repayment of currently outstanding indebtedness,
the  Underwriters have determined to conduct the Offering in accordance with the
applicable provisions of  Rule 2720  of the  Conduct Rules.  In accordance  with
these requirements, Dean Witter Reynolds Inc. (the "Independent Underwriter") is
assuming  the responsibilities of acting as "qualified independent underwriter,"
and will recommend the maximum initial  public offering price for the shares  of
Common  Stock  in compliance  with  the requirements  of  the Conduct  Rules. In
connection with  the Offering,  the Independent  Underwriter is  performing  due
diligence  investigations and is reviewing  and participating in the preparation
of this Prospectus and the Registration Statement of which this Prospectus forms
a part. The initial public offering price of the Common Stock will be no  higher
than the price recommended by the Independent Underwiter.
 
                                    EXPERTS
 
    The  combined financial statements of the  Arden Predecessors as of December
31, 1995 and 1994 and for each of  the three years in the period ended  December
31,  1995, the statements of revenues and certain expenses for the 1995 Acquired
Properties, the 1996  Acquired Properties, the  Acquisition Properties, and  the
balance  sheet of Arden Realty Group, Inc.,  a Maryland Corporation as of May 1,
1996, all appearing  in this  Prospectus and Registration  Statement, have  been
audited  by  Ernst &  Young LLP,  independent  auditors, as  set forth  in their
reports thereon appearing elsewhere  herein, and are  included in reliance  upon
such  reports given upon the authority of such firm as experts in accounting and
auditing.
 
    The C&W Market Study was prepared for the Company by Cushman & Wakefield  of
California,  Inc.,  which  is  a  real  estate  service  firm  with  significant
experience and expertise relating to the Southern California office markets  and
the  various  submarkets  therein.  C&W  is a  part  of  a  national  network of
affiliated companies providing real estate related services. The statistical and
other information from  the C&W Market  Study appearing in  this Prospectus  and
Registration  Statement has been included herein  in reliance on C&W's expertise
as a real estate services firm,  with respect to the Southern California  office
markets.
 
                                      122
<PAGE>
                                 LEGAL MATTERS
 
    The  validity of the  shares of Common  Stock offered hereby  will be passed
upon for the  Company by  Latham &  Watkins and  certain legal  matters will  be
passed upon for the Underwriters by Hogan & Hartson L.L.P. Latham & Watkins will
rely upon the opinion of Ballard Spahr Andrews & Ingersoll as to certain matters
of Maryland law.
 
                             ADDITIONAL INFORMATION
 
    The  Company  has filed  with the  Securities  and Exchange  Commission (the
"SEC") a Registration  Statement on  Form S-11 (of  which this  Prospectus is  a
part)  under the Securities  Act with respect to  the securities offered hereby.
This Prospectus does not contain all  information set forth in the  Registration
Statement, certain portions of which have been omitted as permitted by the rules
and  regulations of the SEC.  Statements contained in this  Prospectus as to the
content of any contract or other  document are not necessarily complete, and  in
each  instance reference is made to the  copy of such contract or other document
filed as an  exhibit to the  Registration Statement, each  such statement  being
qualified  in  all respects  by such  reference and  the exhibits  and schedules
hereto. For  further information  regarding  the Company  and the  Common  Stock
offered  hereby, reference is hereby made to the Registration Statement and such
exhibits and schedules,  which may  be obtained from  the SEC  as its  principal
office  at 450 Fifth Street,  N.W., Washington, D.C. 20549,  upon payment of the
fees prescribed by the  SEC. The SEC maintains  a website at  http://www.sec.gov
containing  reports,  proxy  and information  statements  and  other information
regarding registrants, including the Company, that file electronically with  the
SEC. In addition, the Common Stock will be listed on the New York Stock Exchange
("NYSE")  and similar  information concerning the  Company can  be inspected and
copied at the offices of the NYSE, 20 Broad Street, New York, New York 10005.
 
    The  Company  intends  to  furnish  its  stockholders  with  annual  reports
containing  audited  combined  financial  statements  and  a  report  thereon by
independent certified public accountants.
 
                                      123
<PAGE>
                                    GLOSSARY
 
    Unless the context otherwise requires, the following capitalized terms shall
have the meanings set forth below for the purposes of this Prospectus:
 
    "1940 ACT" means the Investment Company Act of 1940, as amended.
 
    "1993 ACT" means the Omnibus Budget Reconciliation Act of 1993.
 
    "401(K) PLAN" means the Arden Realty Group Section 401(k) Savings/Retirement
Plan.
 
    "ACM" means asbestos-containing materials.
 
    "ADA" means the Americans with Disabilities Act.
 
    "ADJUSTED  ANNUALIZED  BASE RENT"  means the  monthly contractual  base rent
under the applicable lease(s) (e.g., relating to a tenant, a Property or all  of
the  Properties, as applicable) as of a  specified date multiplied by 12. If, as
of a specified date, one or more  of the applicable leases calls for free  rent,
the  Adjusted Annualized Base Rent  has been calculated based  on the first full
rent month under the lease(s).
 
    "ARDEN" means Arden Realty Group, Inc., a California corporation.
 
    "ARDEN PREDECESSORS" means Arden and certain Arden affiliated entities which
are engaged  in  owning,  acquiring, managing,  leasing  and  renovating  office
properties in Southern California.
 
    "BOOK-TAX  DIFFERENCE" means the difference between the fair market value of
contributed property at the time of  contribution and the adjusted tax basis  of
such property at such time.
 
    "BUILT-IN  GAIN  ASSET"  means any  asset  acquired  by the  Company  from a
corporation which is or has been a C corporation.
 
    "C&W" means Cushman & Wakefield of California, Inc.
 
    "CHARITABLE BENEFICIARY" means a qualified charitable organization  selected
by  the Company  which will be  the beneficiary of  a trust created  to hold any
excess shares.
 
    "CODE" means the Internal Revenue Code of 1986, as amended.
 
    "COMMON STOCK" means shares  of the Company's Common  Stock, $.01 par  value
per share.
 
    "COMPANY" means Arden Realty Group, Inc., a Maryland corporation.
 
    "CONTRIBUTION AGREEMENTS" means separate contribution agreements between (i)
the  Operating Partnership and certain Participants whereby certain interests in
the  Arden  Predecessors  and  in  certain  of  the  Properties  held  by   such
Participants will be contributed to the Operating Partnership in exchange for OP
Units and (ii) the Operating Partnership and Arden whereby Arden will contribute
certain of its assets to the Operating Partnership in exchange for OP Units.
 
    "CONTROLLED  FOREIGN  CORPORATION"  means  generally  a  foreign corporation
controlled by United States stockholders.
 
    "CREDIT FACILITY" means the $200 million credit facility being finalized  by
the Company.
 
    "CPI" means the Consumer Price Index.
 
    "CUSHMAN & WAKEFIELD" means Cushman & Wakefield of California, Inc.
 
    "DOL" means the Department of Labor.
 
    "ENVIRONMENTAL  LAWS"  means  the  various Federal,  state  and  local laws,
ordinances and regulations relating to the protection of the environment.
 
    "ERISA PLAN" means an employee benefit plan subject to ERISA.
 
    "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.
 
                                      124
<PAGE>
    "FFO" means Funds  from Operations  which is  defined as  net income  (loss)
(computed  in  accordance  with GAAP),  excluding  gains (or  losses)  from debt
restructuring and sales of property,  plus real estate related depreciation  and
amortization  and after  adjustments for  unconsolidated partnerships  and joint
ventures.
 
    "GAAP" means generally accepted accounting principles.
 
    "INTERESTED STOCKHOLDER" means any person who beneficially owns ten  percent
or more of the voting power of a corporation's shares.
 
    "IRA" means an individual retirement account or annuity.
 
    "IRS" means the Internal Revenue Service.
 
    "LBHI" means Lehman Brothers Holdings Inc., an affiliate of Lehman Brothers
 
    "LEASED"  refers  to space  for  which leases  have  been executed  and have
commenced as of the specified date.
 
    "LIMITED PARTNERS" means the limited partners of the Operating Partnership.
 
    "MGCL" means the Maryland General Corporation Law, as amended.
 
    "MORTGAGE FINANCING" means  the seven-year term  loan of approximately  $104
million to the Company.
 
    "NON-ERISA  PLAN" means  an IRA  or a  qualified pension,  profit sharing or
stock bonus plan not subject to ERISA.
 
    "NON-U.S. STOCKHOLDERS" means the persons  that are, for purposes of  United
States   federal  income   taxation,  nonresident   alien  individuals,  foreign
corporations, foreign partnerships or foreign estates or trusts.
 
    "NYSE" means the New York Stock Exchange.
 
    "OFFERING" means  the Offering  of shares  of Common  Stock of  the  Company
pursuant to and as described in this Prospectus.
 
    "OPERATING  PARTNERSHIP"  means Arden  Realty  Group Limited  Partnership, a
Maryland limited partnership.
 
    "OPTION AGREEMENTS" means separate option agreements between the Company and
certain Participants whereby certain interests in the Arden Predecessors and  in
certain  of the Properties held by such  Participants will be transferred to the
Company in exchange for cash.
 
    "OP UNITS" means the limited and general partner interests in the  Operating
Partnership.
 
    "OWNERSHIP  LIMIT"  means the  Company's  Charter provision  prohibiting any
stockholder or group of  affiliated stockholders from owning  more than 9.0%  of
the outstanding Common Stock.
 
    "PARTNERSHIP  AGREEMENT" means the  agreement of limited  partnership of the
Operating Partnership.
 
    "PARTICIPANTS" means the parties participating in the Formation Transactions
including the Company and the Operating Partnership, together with the  partners
and  members of  the Arden Predecessors  and other parties  which hold ownership
interests in certain of the Properties.
 
    "PEER GROUP" means the group of  properties identified by C&W that are  most
similar  in terms of quality,  market position and tenant  appeal to each of the
Company's Properties.
 
    "PFG" means Pacific Financial Group, a California limited partnership.
 
    "PHASE I ASSESSMENTS" means Phase  I Environmental Assessments conducted  by
environmental consultants.
 
                                      125
<PAGE>
    "PLAN  ASSETS" means the assets of the Company which are deemed to be assets
of an ERISA Plan or other plan.
 
    "PREFERRED STOCK" means the $.01 par value preferred stock of the Company.
 
    "PROHIBITED OWNER" means the person or entity holding record title to shares
of the Company in excess of the Ownership Limit.
 
    "PROHIBITED TRANSFEREE" means any  transfer of Common  Stock of the  Company
whereby  the  purported  transfer  would  result  in  any  person  violating the
Ownership Limit.
 
    "PROPERTIES" means  the  24  office  properties  referred  to  herein  which
comprise the Company's portfolio of Southern California office properties.
 
    "PUBLICLY-OFFERED  SECURITY" means  a security  that is  widely held, freely
transferable and  either part  of a  class of  securities registered  under  the
Exchange  Act, or sold pursuant to an effective registration statement under the
Securities Act (provided the  securities are registered  under the Exchange  Act
within  120  days,  or  such later  time  as  may  be allowed  by  the  SEC (the
registration period), after  the end  of the fiscal  year of  the issuer  during
which the offering occurred).
 
    "RECOGNITION  PERIOD"  means the  ten-year period  beginning  on the  date a
Built-In Gain Asset is acquired by the Company.
 
    "REIT" means real estate investment trust as defined by Sections 856 through
860 of the Code and applicable Treasury Regulations.
 
    "RELATED PARTY TENANT" means a  tenant actually or constructively owned  10%
or more by the REIT or an owner of 10% or more of the REIT.
 
    "REPLACEMENT COST RENTS" as defined in the C&W Market Study means the rental
rates  that would be required to provide  a reasonable return on investment to a
developer of a new Class A multi-tenant office building.
 
    "REPRESENTATIVES"  means   Lehman  Brothers   Inc.,  Alex.   Brown  &   Sons
Incorporated,  Dean Witter Reynolds Inc.,  Smith Barney Inc., EVEREN Securities,
Inc. and Raymond James & Associates, Inc.
 
    "RESTRICTED SHARES"  means  the  shares  of Common  Stock  acquired  by  any
Participant  in exchange for OP Units  which will be restricted securities under
the meaning of Rule 144 promulgated under the Securities Act.
 
    "RULE 144" means Rule 144 promulgated under the Securities Act.
 
    "SECURITIES ACT" means the Securities Act of 1933, as amended.
 
    "STOCK INCENTIVE PLAN" means the 1996  Stock Incentive Plan of Arden  Realty
Group, Inc. and Arden Realty Group, Ltd.
 
    "UBTI" means unrelated business taxable income.
 
    "UNDERWRITERS"  means  the  underwriters  of the  Offering  for  whom Lehman
Brothers Inc., Alex. Brown & Sons Incorporated, Dean Witter Reynolds Inc., Smith
Barney Inc., EVEREN Securities,  Inc. and Raymond James  & Associates, Inc.  are
acting as representatives.
 
    "U.S.  STOCKHOLDER" means a holder of shares of Common Stock who (for United
States federal income tax purposes) (i) is  a citizen or resident of the  United
States, (ii) is a corporation, partnership, or other entity created or organized
in  or  under the  laws of  the United  States or  of any  political subdivision
thereof, or (iii) is an estate or trust the income of which is subject to United
States federal income taxation regardless of its source.
 
    "UST" means underground storage tank.
 
                                      126
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
ARDEN REALTY GROUP, INC.
Pro Forma Condensed Combined Financial Statements (Unaudited):............................................        F-2
  Pro Forma Condensed Combined Balance Sheet as of March 31, 1996.........................................        F-3
  Pro Forma Condensed Combined Statement of Operations for the Three Months Ended March 31, 1996..........        F-4
  Pro Forma Condensed Combined Statement of Operations for the Year Ended December 31, 1995...............        F-5
  Notes to Pro Forma Condensed Combined Financial Statements..............................................        F-6
 
Historical:
  Report of Independent Auditors..........................................................................       F-10
  Balance Sheet as of May 1, 1996.........................................................................       F-11
  Notes to Balance Sheet..................................................................................       F-12
 
ARDEN PREDECESSORS
Combined Financial Statements:
  Report of Independent Auditors..........................................................................       F-15
  Combined Balance Sheets as of March 31, 1996 (Unaudited), December 31, 1995 and 1994....................       F-16
  Combined Statements of Operations for the Three Months ended March 31, 1996 and 1995 (Unaudited) and the
   Years Ended December 31, 1995, 1994 and 1993...........................................................       F-17
  Combined Statements of Owners' Equity for the Three Months ended March 31, 1996 and 1995 (Unaudited) and
   the Years Ended December 31, 1995, 1994 and 1993.......................................................       F-18
  Combined Statements of Cash Flows for the Three Months ended March 31, 1996 and 1995 (Unaudited) and the
   Years Ended December 31, 1995, 1994 and 1993...........................................................       F-19
  Notes to Combined Financial Statements..................................................................       F-20
  Schedule III - Commercial Office Properties and Accumulated Depreciation................................       F-27
 
1995 ACQUIRED PROPERTIES
Combined Statements of Revenue and Certain Expenses:
  Report of Independent Auditors..........................................................................       F-29
  Combined Statements of Revenue and Certain Expenses for the Three Months Ended March 31, 1996 and 1995
   (Unaudited) and the Year Ended December 31, 1995.......................................................       F-30
  Notes to Combined Statements of Revenue and Certain Expenses............................................       F-31
 
1996 ACQUIRED PROPERTIES
Combined Statements of Revenue and Certain Expenses:
  Report of Independent Auditors..........................................................................       F-33
  Combined Statements of Revenue and Certain Expenses for the Three Months Ended March 31, 1996 and 1995
   (Unaudited) and the Year Ended December 31, 1995.......................................................       F-34
  Notes to Combined Statements of Revenue and Certain Expenses............................................       F-35
 
ACQUISITION PROPERTIES
Combined Statements of Revenue and Certain Expenses:
  Report of Independent Auditors..........................................................................       F-37
  Combined Statements of Revenue and Certain Expenses for the Three Months Ended March 31, 1996 and 1995
   (Unaudited) and the Year Ended December 31, 1995.......................................................       F-38
  Notes to Combined Statements of Revenue and Certain Expenses............................................       F-39
</TABLE>
 
                                      F-1
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
               PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
                                  (UNAUDITED)
 
    The  unaudited pro forma  financial and operating  information for the three
months ended March 31, 1996 and the year ended December 31, 1995 is presented as
if the  Offering, the  Formation  Transactions (including  the purchase  of  the
Acquisition  Properties), and the acquisitions of the Properties acquired during
1996 prior to the Offering (the  "1996 Acquired Properties") and the  Properties
acquired  during 1995 (the  "1995 Acquired Properties") all  had occurred by the
date of the March 31,  1996 combined balance sheet and  at the beginning of  the
period  presented for the combined statements of operations. The pro forma March
31, 1996  balance  sheet information  also  gives  effect to  the  recording  of
minority  interest for OP Units, as if  these transactions occurred on March 31,
1996.
 
    The pro forma financial  statements are not  necessarily indicative of  what
the  Company's  financial  position or  results  of operations  would  have been
assuming the completion of the Formation  Transactions and the Offering on  such
date or at the beginning of the period indicated, nor does it purport to project
the  Company's financial position or results of operations at any future date or
for any future period.
 
                                      F-2
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
                   PRO FORMA CONDENSED COMBINED BALANCE SHEET
                              AS OF MARCH 31, 1996
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                      HISTORICAL
                                                                        ARDEN       PRO FORMA      COMPANY
                                                                     PREDECESSORS  ADJUSTMENTS    PRO FORMA
                                                                     ------------  ------------  -----------
<S>                                                                  <C>           <C>           <C>
Commercial office properties-net...................................   $  345,633   $     69,192(A)  $ 414,825
Cash and cash equivalents..........................................        1,253          9,180(B)     10,433
Restricted cash....................................................       23,301        (23,301 (C)     --
Rents and other receivables........................................        1,892        --            1,892
Deferred rents.....................................................        3,874        --            3,874
Prepaid financing and leasing costs-net............................        2,648            505(D)      3,153
Prepaid expenses and other assets..................................        1,689        --            1,689
                                                                     ------------  ------------  -----------
    Total assets...................................................   $  380,290   $     55,576   $ 435,866
                                                                     ------------  ------------  -----------
                                                                     ------------  ------------  -----------
 
                                    LIABILITIES AND STOCKHOLDERS' EQUITY
 
Mortgage loans payable.............................................   $  352,805   $   (248,975 (E)  $ 103,830
Unsecured lines of credit..........................................          589           (589 (F)     --
Accounts payable and accrued expenses..............................        5,242         (1,441 (G)      3,801
Deferred interest..................................................        3,156         (3,156 (H)     --
Security deposits..................................................        2,721        --            2,721
                                                                     ------------  ------------  -----------
    Total liabilities..............................................      364,513       (254,161)    110,352
                                                                     ------------  ------------  -----------
Minority interests in Operating Partnership........................       --             41,103(I)     41,103
Owners' Equity.....................................................       15,777        (15,777 (J)     --
STOCKHOLDERS' EQUITY:
  Common Stock.....................................................       --                187(K)        187
  Additional paid-in capital.......................................       --            284,224(L)    284,224
  Retained earnings................................................       --            --           --
                                                                     ------------  ------------  -----------
    Total stockholders' equity.....................................            0        284,411     284,411
                                                                     ------------  ------------  -----------
    Total liabilities and equity...................................   $  380,290   $     55,576   $ 435,866
                                                                     ------------  ------------  -----------
                                                                     ------------  ------------  -----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-3
<PAGE>
                            ARDEN REALTY GROUP, INC.
              PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                   FOR THE THREE MONTHS ENDED MARCH 31, 1996
                                  (UNAUDITED)
                      (IN THOUSANDS EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                         HISTORICAL      1996
                                           ARDEN       ACQUIRED    ACQUISITION     TOTAL      PRO FORMA     COMPANY
                                        PREDECESSORS  PROPERTIES   PROPERTIES    COMBINED    ADJUSTMENTS   PRO FORMA
                                        ------------  -----------  -----------  -----------  -----------  -----------
<S>                                     <C>           <C>          <C>          <C>          <C>          <C>
REVENUE
  Rental..............................   $   12,471    $   5,019    $     942    $  18,432    $  (1,870)(M)  $  16,562
  Tenant reimbursements...............          758          309           17        1,084         (225)(N)        859
  Parking.............................        1,267          459           41        1,767         (171)(O)      1,596
  Other...............................          558           73          110          741         (199)(P)        542
                                        ------------  -----------  -----------  -----------  -----------  -----------
    Total revenue.....................       15,054        5,860        1,110       22,024       (2,465)      19,559
                                        ------------  -----------  -----------  -----------  -----------  -----------
OPERATING EXPENSES
  Property operating, taxes, insurance
   and ground rent....................        4,579        2,269          454        7,302       (1,840)(Q)      5,462
  Property general and
   administrative.....................          732          133           23          888           (1)(R)        887
                                        ------------  -----------  -----------  -----------  -----------  -----------
    Total property operating
     expenses.........................        5,311        2,402          477        8,190       (1,841)       6,349
                                        ------------  -----------  -----------  -----------  -----------  -----------
                                              9,743        3,458          633       13,834         (624)      13,210
  REIT general and administrative.....          364       --           --              364          570(S)        934
  Interest expense....................        8,832       --           --            8,832       (6,718)(T)      2,114
                                        ------------  -----------  -----------  -----------  -----------  -----------
                                              9,196       --           --            9,196       (6,148)       3,048
                                        ------------  -----------  -----------  -----------  -----------  -----------
Income before depreciation,
 amortization and minority
 interests............................          547        3,458          633        4,638        5,524       10,162
  Depreciation and amortization.......        2,396       --           --            2,396          713(U)      3,109
                                        ------------  -----------  -----------  -----------  -----------  -----------
(Loss) Income before minority
 interests............................       (1,849)       3,458          633        2,242        4,811        7,053
Minority interests....................       --           --           --           --              891(V)        891
                                        ------------  -----------  -----------  -----------  -----------  -----------
(Loss) Income.........................   $   (1,849)   $   3,458    $     633    $   2,242    $   3,920    $   6,162
                                        ------------  -----------  -----------  -----------  -----------  -----------
                                        ------------  -----------  -----------  -----------  -----------  -----------
PRO FORMA COMMON SHARES OUTSTANDING
 BEFORE CONVERSION OF OP UNITS........                                                                        18,725
                                                                                                          -----------
                                                                                                          -----------
NET INCOME PER SHARE..................                                                                          $.33
                                                                                                          -----------
                                                                                                          -----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-4
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
              PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1995
                                  (UNAUDITED)
                      (IN THOUSANDS EXCEPT PER SHARE DATA)
<TABLE>
<CAPTION>
                                                   HISTORICAL      1995         1996
                                                     ARDEN       ACQUIRED     ACQUIRED    ACQUISITION     TOTAL      PRO FORMA
                                                  PREDECESSORS  PROPERTIES   PROPERTIES   PROPERTIES    COMBINED    ADJUSTMENTS
                                                  ------------  -----------  -----------  -----------  -----------  -----------
<S>                                               <C>           <C>          <C>          <C>          <C>          <C>
REVENUE
  Rental........................................   $   24,442    $  21,791    $  19,391    $   4,280    $  69,904    $  (3,213)(M)
  Tenant reimbursements.........................          822        1,233          961           54        3,070          (51)(N)
  Parking.......................................        1,665        2,822        1,859          133        6,479         (584)(O)
  Other.........................................        1,653          972          350           85        3,060         (619)(P)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
    Total revenue...............................       28,582       26,818       22,561        4,552       82,513       (4,467)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
OPERATING EXPENSES
  Property operating, taxes, insurance and
   ground rent..................................        8,679       10,082        8,335        2,120       29,216       (4,670)(Q)
  Property general and administrative...........        1,588          952          513          108        3,161          830(R)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
    Total property operating expenses...........       10,267       11,034        8,848        2,228       32,377       (3,840)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
                                                       18,315       15,784       13,713        2,324       50,136         (627)
REIT general and administrative.................        1,377       --           --           --            1,377        2,358(S)
Interest expense................................       13.780       --           --           --           13,780       (5,361)(T)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
                                                       15,157       --           --           --           15,157       (3,003)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
Income before depreciation, amortization and
 minority interests.............................        3,158       15,784       13,713        2,324       34,979        2,376
  Depreciation and amortization.................        4,373       --           --           --            4,373        7,317(U)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
(Loss) Income before minority interests.........       (1,215)      15,784       13,713        2,324       30,606       (4,941)
Minority interests..............................       --           --           --           --           --            3,242(V)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
(Loss) Income...................................   $   (1,215)   $  15,784    $  13,713    $   2,324    $  30,606    $  (8,183)
                                                  ------------  -----------  -----------  -----------  -----------  -----------
                                                  ------------  -----------  -----------  -----------  -----------  -----------
PRO FORMA COMMON SHARES OUTSTANDING BEFORE
 CONVERSION OF OP UNITS.........................
NET INCOME PER SHARE............................
 
<CAPTION>
 
                                                    COMPANY
                                                   PRO FORMA
                                                  -----------
<S>                                               <C>
REVENUE
  Rental........................................   $  66,691
  Tenant reimbursements.........................       3,019
  Parking.......................................       5,895
  Other.........................................       2,441
                                                  -----------
    Total revenue...............................      78,046
                                                  -----------
OPERATING EXPENSES
  Property operating, taxes, insurance and
   ground rent..................................      24,546
  Property general and administrative...........       3,991
                                                  -----------
    Total property operating expenses...........      28,537
                                                  -----------
                                                      49,509
REIT general and administrative.................       3,735
Interest expense................................       8,419
                                                  -----------
                                                      12,154
                                                  -----------
Income before depreciation, amortization and
 minority interests.............................      37,355
  Depreciation and amortization.................      11,690
                                                  -----------
(Loss) Income before minority interests.........      25,665
Minority interests..............................       3,242
                                                  -----------
(Loss) Income...................................   $  22,423
                                                  -----------
                                                  -----------
PRO FORMA COMMON SHARES OUTSTANDING BEFORE
 CONVERSION OF OP UNITS.........................      18,725
                                                  -----------
                                                  -----------
NET INCOME PER SHARE............................       $1.20
                                                  -----------
                                                  -----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-5
<PAGE>
                            ARDEN REALTY GROUP, INC.
                     NOTES TO PRO FORMA CONDENSED COMBINED
                              FINANCIAL STATEMENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
1.  ADJUSTMENTS TO THE PRO FORMA CONDENSED COMBINED BALANCE SHEET
    The  adjustments to  the Pro  Forma Condensed  Combined Balance  Sheet as of
March 31, 1996 are as follows:
 
<TABLE>
<S>        <C>                                                                          <C>
(A)        Increase in commercial properties - net
                 Purchase price and actual and estimated additional closing costs of
                  100 Broadway and the Acquisition Properties.........................  $  55,450
                 Purchase price in excess of book value of interests in the Properties
                  purchased from Arden Predecessors...................................     13,742
                                                                                        ---------
                   Increase in commercial properties-net..............................  $  69,192
                                                                                        ---------
                                                                                        ---------
(B)        Increase in cash and cash equivalents
                 Net Offering Proceeds:
                   Proceeds from the Offering.........................................  $ 374,505
                   Proceeds from the new debt origination.............................    103,830
                   Costs associated with offering.....................................    (29,033)
                   Costs associated with the new debt origination.....................     (1,422)
                                                                                        ---------
                     Net Offering Proceeds............................................    447,880
                 Use of Proceeds:
                   Payment of mortgage loans of Arden Predecessors....................   (352,805)
                   Payment of unsecured line of credit of Arden Predecessors..........       (589)
                   Purchase of 100 Broadway and the Acquisition Properties............    (55,450)
                   Purchases of certain interests in Arden Predecessors...............    (28,575)
                   Payment of additional interest on debt of Arden Predecessors.......    (23,141)
                   Release of restricted cash.........................................     23,301
                   Payment of accrued interest on debt of Arden Predecessors..........     (1,441)
                                                                                        ---------
                     Use of Proceeds..................................................   (438,700)
                       Increase in cash and cash equivalents..........................  $   9,180
                                                                                        ---------
                                                                                        ---------
(C)        Release of restricted cash at payment of debt..............................  $ (23,301)
                                                                                        ---------
                                                                                        ---------
(D)        Increase in prepaid financing and leasing costs - net
               Decrease in prepaid financing costs related to the retired debt........  $    (917)
               Increase in prepaid financing costs related to originated debt.........      1,422
                                                                                        ---------
                 Total increase in prepaid financing and leasing costs-net............  $     505
                                                                                        ---------
                                                                                        ---------
(E)        Decrease in mortgage loans payable
               Repayment of mortgage loans............................................  $(352,805)
               Origination of new debt................................................    103,830
                                                                                        ---------
                 Net decrease in mortgage loans payable...............................  $(248,975)
                                                                                        ---------
                                                                                        ---------
(F)        Repayment of unsecured lines of credit.....................................  $    (589)
                                                                                        ---------
                                                                                        ---------
(G)        Payment of accrued interest expense at time of repayment of existing debt    $  (1,441)
                                                                                        ---------
                                                                                        ---------
</TABLE>
 
                                      F-6
<PAGE>
                            ARDEN REALTY GROUP, INC.
              NOTES TO PRO FORMA CONDENSED COMBINED -- (CONTINUED)
                              FINANCIAL STATEMENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
1.  ADJUSTMENTS TO THE PRO FORMA CONDENSED COMBINED BALANCE SHEET (CONTINUED)
<TABLE>
<S>        <C>                                                                          <C>
(H)        Payment of deferred interest at time of repayment of existing debt (part of
            additional interest)......................................................  $  (3,156)
                                                                                        ---------
                                                                                        ---------
(I)        To establish minority interests based on equity share of minority interest
            in Operating Partnership..................................................  $  41,103
                                                                                        ---------
                                                                                        ---------
(J)        Elimination of owners' equity of Arden Predecessors........................  $ (15,777)
                                                                                        ---------
                                                                                        ---------
(K)        Par Value of the Common Stock to be issued.................................  $     187
                                                                                        ---------
                                                                                        ---------
(L)        Increase in additional paid-in capital
                 Proceeds from the Offering...........................................  $ 374,505
                 Costs associated with the Offering...................................    (29,033)
                 Book value of certain purchased interests in Arden Predecessors......    (14,833)
                 Par value............................................................       (187)
                 Write off of unamortized Loan Fees...................................       (917)
                 Elimination of owners' equity of Arden Predecessors..................     15,777
                 Payment of additional interest not previously accrued................    (19,985)
                 Minority interest....................................................    (41,103)
                                                                                        ---------
                                                                                        ---------
                   Increase in additional paid-in capital.............................  $ 284,224
                                                                                        ---------
                                                                                        ---------
</TABLE>
 
2.  ADJUSTMENTS TO THE PRO FORMA CONDENSED COMBINED STATEMENTS OF OPERATIONS
    The pro  forma adjustments  reflected in  the Pro  Forma Condensed  Combined
Statements  of Operations for the three months ended March 31, 1996 and the year
ended December 31, 1995 are set  forth below. The pro forma adjustments  include
the  elimination of the portion of revenue and expenses that are included in the
March 31, 1996 and December 31, 1995 financial statements for the 1996  Acquired
Properties  and  the  1995  Acquired Properties,  respectively,  which  are also
included in the statement of operations of the Arden Predecessors for the period
owned by the Arden Predecessors (the "Arden Eliminations"). The following is the
list of the Arden Eliminations:
 
<TABLE>
<CAPTION>
                                                                                     THREE MONTHS
                                                                                        ENDED          YEAR ENDED
                                                                                    MARCH 31, 1996  DECEMBER 31, 1995
                                                                                    --------------  -----------------
<S>        <C>                                                                      <C>             <C>
           Elimination of rental revenue..........................................    $    2,022       $     5,174
           Elimination of tenant reimbursements...................................           141               160
           Elimination of parking revenue.........................................           171               584
           Elimination of other income............................................            12                95
           Elimination of property operating, taxes, insurance and ground rent....         1,121             3,069
           Elimination of property general and administrative.....................            57               152
</TABLE>
 
                                      F-7
<PAGE>
                            ARDEN REALTY GROUP, INC.
              NOTES TO PRO FORMA CONDENSED COMBINED -- (CONTINUED)
                              FINANCIAL STATEMENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
2.  ADJUSTMENTS TO THE PRO FORMA CONDENSED COMBINED STATEMENTS OF
OPERATIONS (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                     THREE MONTHS
                                                                                        ENDED          YEAR ENDED
                                                                                    MARCH 31, 1996  DECEMBER 31, 1995
                                                                                    --------------  -----------------
<S>        <C>                                                                      <C>             <C>
(M)        Decrease in rental revenue
                 The Arden Elimination............................................    $   (2,022)      $    (5,174)
                 To adjust the 1995 Acquired Properties, the 1996 Acquired
                  Properties and the Acquisition Properties to effective rental
                  revenue based on the accounting basis of the Arden
                  Predecessors....................................................           152             1,961
                                                                                         -------          --------
                   Net decrease in rental revenue.................................    $   (1,870)      $    (3,213)
                                                                                         -------          --------
                                                                                         -------          --------
(N)        Decrease in tenant reimbursements
                 The Arden Elimination............................................    $     (141)      $      (160)
                 Adjustment to tenant reimbursements due to the reassessment of
                  property taxes and changes in insurance and property and general
                  administrative costs............................................           (84)              109
                                                                                         -------          --------
                   Net decrease in tenant reimbursements..........................    $     (225)      $       (51)
                                                                                         -------          --------
                                                                                         -------          --------
(O)        The Arden Elimination..................................................    $     (171)      $      (584)
                                                                                         -------          --------
                                                                                         -------          --------
(P)        Decrease in other income
                 The Arden Elimination............................................    $      (12)      $       (95)
                 To eliminate non-recurring construction management fees and
                  interest income.................................................          (187)             (524)
                                                                                         -------          --------
                   Net decrease in other income...................................    $     (199)      $      (619)
                                                                                         -------          --------
                                                                                         -------          --------
(Q)        Decrease in property operating, taxes, insurance and ground rent
                 The Arden Elimination............................................    $   (1,121)      $    (3,069)
                 Net decrease due to the reassessment of property taxes and
                  reduction of insurance costs....................................          (719)           (1,601)
                                                                                         -------          --------
                   Net decrease in property operating, taxes, insurance and ground
                    rent..........................................................    $   (1,840)      $    (4,670)
                                                                                         -------          --------
                                                                                         -------          --------
(R)        (Decrease) increase in property general and administrative
                 The Arden Elimination............................................    $      (57)      $      (152)
                 Increase in property general and administrative related to
                  additional property payroll costs relating to the 1995 Acquired
                  Properties, the 1996 Acquired Properties and the Acquisition
                  Properties......................................................            56               982
                                                                                         -------          --------
                   Net (decrease) increase in property general and administrative     $       (1)      $       830
                                                                                         -------          --------
                                                                                         -------          --------
</TABLE>
 
                                      F-8
<PAGE>
                            ARDEN REALTY GROUP, INC.
              NOTES TO PRO FORMA CONDENSED COMBINED -- (CONTINUED)
                              FINANCIAL STATEMENTS
                                  (UNAUDITED)
                                 (IN THOUSANDS)
 
2.  ADJUSTMENTS TO THE PRO FORMA CONDENSED COMBINED STATEMENTS OF
OPERATIONS (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                     THREE MONTHS
                                                                                        ENDED          YEAR ENDED
                                                                                    MARCH 31, 1996  DECEMBER 31, 1995
                                                                                    --------------  -----------------
<S>        <C>                                                                      <C>             <C>
(S)        Increase in REIT general and administrative related to current level of
            operations as a public real estate investment trust...................    $      570       $     2,358
                                                                                         -------          --------
                                                                                         -------          --------
(T)        Decrease in interest expense
                 Decrease in interest expense due to repayment of mortgage
                  loans...........................................................    $   (8,832)      $   (13,780)
                 Increase in interest expense related to the newly originated
                  debt............................................................         2,063             8,216
                 Net increase for loan fee amortization related to the originated
                  debt............................................................            51               203
                                                                                         -------          --------
                   Net decrease in interest expense...............................    $   (6,718)      $    (5,361)
                                                                                         -------          --------
                                                                                         -------          --------
(U)        Net increase in depreciation expense to reflect a full period of
            depreciation for the 1995 Acquired Properties, the 1996 Acquired
            Properties and the Acquisition Properties.............................    $      613       $     6,918
 
           Increase in depreciation due to the purchase price in excess of book
            value of interest in the Properties purchased from Arden
            Predecessors..........................................................           100               399
                                                                                         -------          --------
                   Net increase in depreciation expense...........................    $      713       $     7,317
                                                                                         -------          --------
                                                                                         -------          --------
(V)        To reflect adjustment for minority interest in the Operating
            Partnership of 12.63%.................................................    $      891       $     3,242
                                                                                         -------          --------
                                                                                         -------          --------
</TABLE>
 
                                      F-9
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors
Arden Realty Group, Inc.
 
    We have audited the accompanying balance sheet of Arden Realty Group,  Inc.,
a  Maryland  Corporation,  as  of  May  1,  1996.  This  balance  sheet  is  the
responsibility of the management of Arden Realty Group, Inc. Our  responsibility
is to express an opinion on the balance sheet based on our audit.
 
    We  conducted  our  audit  in accordance  with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable  assurance  about  whether  the balance  sheet  is  free  of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts  and  disclosures in  the  balance  sheet. An  audit  also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well  as evaluating the  overall balance  sheet presentation. We
believe that our audit provides a reasonable basis for our opinion.
 
    In our opinion, the balance sheet presents fairly, in all material respects,
the financial position of Arden Realty  Group, Inc., a Maryland corporation,  as
of May 1, 1996 in conformity with generally accepted accounting principles.
 
                                          Ernst & Young LLP
 
Los Angeles, California
May 1, 1996
 
                                      F-10
<PAGE>
                            ARDEN REALTY GROUP, INC.
                                 BALANCE SHEET
                                  MAY 1, 1996
 
<TABLE>
<S>                                                                             <C>
ASSETS........................................................................  $   --
                                                                                -----------
                                                                                -----------
 
LIABILITIES AND STOCKHOLDERS' EQUITY
 
Commitments and contingencies (NOTE 2)........................................  $   --
                                                                                -----------
Preferred Stock, $.01 par value, 20,000,000 shares authorized, none issued and
 outstanding..................................................................  $   --
                                                                                -----------
Common stock, $.01 par value, 100,000,000 shares authorized, none issued and
 outstanding..................................................................  $   --
                                                                                -----------
                                                                                $   --
                                                                                -----------
                                                                                -----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-11
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
                             NOTES TO BALANCE SHEET
 
                                  MAY 1, 1996
 
1.  ORGANIZATION
    Arden Realty Group, Inc. (the "Company") is a Maryland corporation which was
formed  on  May  1, 1996,  to  acquire  a portfolio  of  office  properties (the
"Properties") and continue the real estate business of Arden Realty Group, Inc.,
a California Corporation, its principals and certain affiliated partnerships and
other entities  (collectively the  "Arden Predecessors")  which are  engaged  in
owning,  acquiring,  managing,  leasing  and  renovating  office  properties  in
Southern California.
 
    The Company  will be  the sole  general partner  of a  newly formed  limited
partnership  (the "Operating Partnership").  The Company will  initially hold an
aggregate of 87.37% of the ownership interests in the Operating Partnership. The
Operating Partnership will hold all the interests in the Properties. The Company
will  conduct  substantially   all  of  its   business  through  the   Operating
Partnership.  As  the sole  general partner  of  the Operating  Partnership, the
Company will have  exclusive power  to manage and  conduct the  business of  the
Operating Partnership, subject to certain limited exceptions.
 
    Concurrently  with the  consummation of  a proposed  public offering  of the
Company's  Common  Stock  (the  "Offering"),  the  Company  and  the   Operating
Partnership,  together with the  partners and members  of the Arden Predecessors
and other parties which  hold ownership interests in  certain of the  Properties
(collectively,   the   "Participants"),   will  engage   in   certain  formation
transactions (the  "Formation Transactions").  The Formation  Transactions  have
been  designed  to (i)  enable the  Company  to raise  the necessary  capital to
acquire the Properties and  repay certain mortgage  debt relating thereto,  (ii)
provide  a vehicle for  future acquisitions, (iii) enable  the Company to comply
with certain  requirements under  the federal  income tax  laws and  regulations
relating to real estate investment trusts, (iv) facilitate potential securitized
mortgage  financings, and (v) preserve certain  tax advantages for certain Arden
Predecessors. The Formation Transactions are as follows:
 
    - The Company will sell shares of Common Stock in the Offering.
 
    - Pursuant to  separate option  agreements  (the "Option  Agreements"),  the
      Company  will acquire  for cash  from certain  Participants (not including
      Messrs. Ziman  and Coleman  who will  not receive  cash in  the  Formation
      Transactions)  the interests owned by such  Participants in certain of the
      Arden Predecessors and in certain of the Properties. The Company will  pay
      approximately $28.6 million from the net proceeds of the Offering for such
      interests.
 
    - The  Company will contribute  (i) the interests  in the Arden Predecessors
      and in the Properties acquired pursuant to the Option Agreements and  (ii)
      the   net  proceeds  from   the  Offering  (after   payment  of  the  cash
      consideration to certain Participants as described above) to the Operating
      Partnership in  exchange for  a  87.37% general  partner interest  in  the
      Operating Partnership.
 
    - Pursuant   to   separate   contribution   agreements   (the  "Contribution
      Agreements"), the following additional contributions  will be made to  the
      Operating  Partnership  in  exchange  for  OP  Units  representing limited
      partner interests: (i) certain Participants will contribute the  remaining
      interests  in  the Arden  Predecessors and  in  certain of  the Properties
      (I.E., all interests not  acquired by the Company  pursuant to the  Option
      Agreements)  and  (ii)  Arden  will  contribute  certain  of  its  assets,
      including management contracts relating to  certain of the Properties  and
      the  contract rights to purchase  the Acquisition Properties (303 Glenoaks
      Blvd. and  12501  East Imperial  Highway).  The Participants  making  such
      contributions (including Arden and Messrs. Ziman and Coleman) will receive
      an   aggregate  of  2,706,000  OP  Units,   with  an  estimated  value  of
      approximately $54.1 million based on  the assumed initial public  offering
      price of the Common Stock.
 
                                      F-12
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
                     NOTES TO BALANCE SHEET -- (CONTINUED)
 
                                  MAY 1, 1996
 
1.  ORGANIZATION (CONTINUED)
    - The  Company, through the Operating Partnership, will borrow approximately
      $104 million aggregated principal amount under a seven-year term loan (the
      "Mortgage Financing") which  will be secured  by cross-collateralized  and
      cross-defaulted  first  mortgage  lien(s)  on 10  of  the  Properties (the
      "Mortgage Financing Properties").
 
    - Approximately $35 million  of the  net proceeds  of the  Offering and  the
      Mortgage  Financing will be used by  the Operating Partnership to purchase
      the Acquisition Properties.
 
    - Approximately $392 million  of the net  proceeds of the  Offering and  the
      Mortgage  Financing will  be used  by the  Operating Partnership  to repay
      certain  mortgage  debt  secured   by  the  Properties  and   indebtedness
      outstanding  under  lines  of  credit  to  be  assumed  by  the  Operating
      Partnership in the Formation Transactions.
 
    - The Company, through the Operating  Partnership, will enter into the  $200
      million Credit Facility.
 
2.  COMMITMENTS AND CONTINGENCIES
    The  Company will become a party to various legal actions resulting from the
operating activities  to  be transferred  to  the Operating  Partnership.  These
actions  are  incidental to  the transferred  business  and management  does not
believe that these actions will have a material adverse effect on the Company.
 
    Pursuant to  the  Operating  Partnership's  limited  partnership  agreement,
beginning  one  year after  consummation of  the Offering,  the OP  Units issued
concurrently with the Offering  are redeemable (at the  election of the  holder)
for  cash or, at  the option of  the Company, exchangeable  for shares of Common
Stock of the Company on a one-for-one basis.
 
3.  RISKS AND UNCERTAINTIES
    The preparation  of  financial  statements,  in  conformity  with  generally
accepted  accounting  principles,  requires  management  to  make  estimates and
assumptions that  affect the  reported  amounts of  assets and  liabilities  and
disclosure  of contingent  assets and liabilities  at the date  of the financial
statements and  the  reported  amounts  of  revenues  and  expenses  during  the
reporting period. Actual results could differ from those estimates.
 
4.  INCOME TAXES
    After the Offering, the Company intends to make an election to be taxed as a
real  estate investment  trust ("REIT")  under Sections  586 through  860 of the
Internal Revenue Code. As a REIT, the  Company generally will not be subject  to
federal income tax if it distributes at least 95% of its taxable income for each
tax  year to its stockholders.  REITs are subject to  a number of organizational
and operational requirements. If the Company fails  to qualify as a REIT in  any
taxable  year, the Company will be subject  to federal income tax (including any
applicable alternative minimum tax) on  its taxable income at regular  corporate
tax rates. Even if the Company qualifies for taxation as a REIT, the Company may
be  subject to state and local income taxes and to federal income tax and excise
tax on its undistributed income.
 
5.  STOCK INCENTIVE PLAN
    The Company intends to adopt a Stock Incentive Plan to provide incentives to
attract and retain officers, key employees and outside directors.
 
    The Stock  Incentive Plan  will  be qualified  under  Rule 16b-3  under  the
Securities  Exchange  Act of  1934, as  amended  (the"Exchange Act").  The Stock
Incentive Plan will be  administered by the  Compensation Committee and  provide
for the granting of stock options, stock appreciation rights or restricted stock
with respect to up to 1,500,000 shares of Common Stock to executive or other key
employees of the Company.
 
                                      F-13
<PAGE>
                            ARDEN REALTY GROUP, INC.
 
                     NOTES TO BALANCE SHEET -- (CONTINUED)
 
                                  MAY 1, 1996
 
5.  STOCK INCENTIVE PLAN (CONTINUED)
Stock  options  may be  granted in  the  form of  "incentive stock  options," as
defined in  Section 422  of the  Code, or  non-statutory stock  options and  are
exercisable  for up to 10 years following  the date of grant. The exercise price
of each  option will  be established  by the  Compensation Committee;  provided,
however,  that the  price per share  must be equal  to or greater  than the fair
market value of the Common Stock on the grant date.
 
    The  Stock  Incentive  Plan  also   provides  for  the  issuance  of   stock
appreciation  rights which  will generally entitle  a holder to  receive cash or
stock, as determined  by the  Compensation Committee,  at the  time of  exercise
equal  to the difference between the exercise price and the fair market value of
the Common Stock. In addition, the  Stock Incentive Plan permits the Company  to
issue  shares of restricted stock to executive  or other key employees upon such
terms and conditions as shall be determined by the Compensation Committee.
 
    During  1995  an  accounting  pronouncement  was  issued  by  the  Financial
Accounting  Standards Board that applies to  the Company, Statement of Financial
Accounting   Standards   ("SFAS")   No.   123,   "Accounting   for   Stock-Based
Compensation."  This new standard  will become effective  for the Company's 1996
fiscal year. SFAS  No. 123 establishes  a fair value  method for accounting  for
stock-based  compensation, such as  option plans, but does  not require that the
new method  be  adopted.  The  Company  may  elect  to  continue  following  the
methodology  in APB Opinion No. 25,  "Accounting for Stock Issued to Employees",
whereby the  compensation expense  is  measured as  the difference  between  the
exercise  price of the option  and the stock price  on the measurement date with
the  fair  value  of  options  disclosed  in  the  footnotes  in  the  financial
statements.  SFAS  No. 123  is not  expected to  adversely affect  the Company's
future reported results.
 
                                      F-14
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Owners of the Arden Predecessors
 
    We have  audited  the accompanying  combined  balance sheets  of  the  Arden
Predecessors,  as defined in Note  1, as of December 31,  1995 and 1994, and the
related combined statements  of operations,  owners' equity and  cash flows  for
each  of the three years in the period  ended December 31, 1995. Our audits also
included the financial statement schedule III, commercial office properties  and
accumulated  depreciation.  These  financial  statements  and  schedule  are the
responsibility of the management of  the Arden Predecessors. Our  responsibility
is to express an opinion on these financial statements and schedule based on our
audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our opinion, the combined financial statements referred to above present
fairly, in all material respects, the  combined financial position of the  Arden
Predecessors as of December 31, 1995 and 1994, and the combined results of their
operations  and  cash flows  for each  of the  three years  in the  period ended
December 31, 1995, in conformity with generally accepted accounting  principles.
Also,  in our opinion, the related financial statement schedule, when considered
in relation to the financial statements taken as a whole, presents fairly in all
material respects the information set forth therein.
 
                                          Ernst & Young LLP
 
Los Angeles, California
April 10, 1996
 
                                      F-15
<PAGE>
                               ARDEN PREDECESSORS
 
                            COMBINED BALANCE SHEETS
                                 (IN THOUSANDS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                DECEMBER 31,
                                                                                           ----------------------
                                                                                              1995        1994
                                                                               MARCH 31,   ----------  ----------
                                                                                 1996
                                                                              -----------
                                                                              (UNAUDITED)
<S>                                                                           <C>          <C>         <C>
Commercial office properties, net of accumulated depreciation of $8,954,
 $6,651 and $2,576, respectively............................................   $ 345,633   $  252,082  $  106,135
Cash and cash equivalents...................................................       1,253        1,731         991
Restricted cash.............................................................      23,301       14,971       2,008
Rents and other receivables.................................................       1,892        1,583         561
Deferred rents..............................................................       3,874        3,126       1,587
Prepaid financing and leasing costs, net of accumulated amortization of
 $950, $894 and $151, respectively..........................................       2,648        2,400       1,204
Prepaid expenses and other assets...........................................       1,689        1,750         568
                                                                              -----------  ----------  ----------
    Total assets............................................................   $ 380,290   $  277,643  $  113,054
                                                                              -----------  ----------  ----------
                                                                              -----------  ----------  ----------
 
                                         LIABILITIES AND OWNERS' EQUITY
 
Mortgage loans payable......................................................   $ 352,805   $  253,183  $   93,684
Unsecured lines of credit...................................................         589          813         748
Accounts payable and accrued expenses.......................................       5,242        5,681       1,756
Deferred interest...........................................................       3,156        1,056      --
Security deposits...........................................................       2,721        2,222         893
                                                                              -----------  ----------  ----------
    Total liabilities.......................................................     364,513      262,955      97,081
Owners' equity..............................................................      15,777       14,688      15,973
                                                                              -----------  ----------  ----------
    Total liabilities and owners' equity....................................   $ 380,290   $  277,643  $  113,054
                                                                              -----------  ----------  ----------
                                                                              -----------  ----------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-16
<PAGE>
                               ARDEN PREDECESSORS
 
                       COMBINED STATEMENTS OF OPERATIONS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                               THREE MONTHS
                                                                   ENDED         FOR THE YEARS ENDED
                                                                 MARCH 31,           DECEMBER 31,
                                                              ---------------  ------------------------
                                                               1996     1995    1995     1994     1993
                                                              -------  ------  -------  -------  ------
                                                                (UNAUDITED)
<S>                                                           <C>      <C>     <C>      <C>      <C>
REVENUE
  Rental....................................................  $12,471  $4,667  $24,442  $11,928  $3,155
  Tenant reimbursements.....................................      758     128      822      509      38
  Parking...................................................    1,267     268    1,665      741     284
  Other.....................................................      558     325    1,653      734     313
                                                              -------  ------  -------  -------  ------
      Total revenue.........................................   15,054   5,388   28,582   13,912   3,790
                                                              -------  ------  -------  -------  ------
OPERATING EXPENSES
  Property operating and maintenance........................    2,577   1,149    6,310    2,980   1,002
  Property general and administrative.......................      732     282    1,588      735     349
  Real estate taxes.........................................      958     286    1,590      695     112
  Insurance.................................................      872      64      627      120      49
  Ground rent...............................................      172      33      152       15    --
                                                              -------  ------  -------  -------  ------
      Total property operating expenses.....................    5,311   1,814   10,267    4,545   1,512
                                                              -------  ------  -------  -------  ------
                                                                9,743   3,574   18,315    9,367   2,278
                                                              -------  ------  -------  -------  ------
General and administrative..................................      364     373    1,377      689     386
Interest....................................................    8,832   2,241   13,780    5,109     673
                                                              -------  ------  -------  -------  ------
                                                                9,196   2,614   15,157    5,798   1,059
                                                              -------  ------  -------  -------  ------
Income before depreciation and amortization and
 extraordinary loss.........................................      547     960    3,158    3,569   1,219
Depreciation and amortization...............................    2,396     879    4,373    2,184     528
                                                              -------  ------  -------  -------  ------
(Loss) income before extraordinary loss.....................   (1,849)     81   (1,215)   1,385     691
Extraordinary loss..........................................    --       --      --        (601)   --
                                                              -------  ------  -------  -------  ------
      Net (loss) income.....................................  $(1,849) $   81  $(1,215) $   784  $  691
                                                              -------  ------  -------  -------  ------
                                                              -------  ------  -------  -------  ------
</TABLE>
 
                            See accompanying notes.
 
                                      F-17
<PAGE>
                               ARDEN PREDECESSORS
 
                     COMBINED STATEMENTS OF OWNERS' EQUITY
             FOR THE THREE MONTHS ENDED MARCH 31, 1996 (UNAUDITED)
            AND FOR THE YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
Balance at January 1, 1993.........................................................  $    (153)
<S>                                                                                  <C>
  Owners' contributions............................................................      3,400
  Owners' distributions............................................................       (460)
  Net income - 1993................................................................        691
                                                                                     ---------
Balance at December 31, 1993.......................................................      3,478
  Owners' contributions............................................................     13,164
  Owners' distributions............................................................     (1,453)
  Net income - 1994................................................................        784
                                                                                     ---------
Balance at December 31, 1994.......................................................     15,973
  Owners' contributions............................................................      8,613
  Owners' distributions............................................................     (8,683)
  Net (loss) - 1995................................................................     (1,215)
                                                                                     ---------
Balance at December 31, 1995.......................................................     14,688
  Owners' contributions (unaudited)................................................      3,500
  Owners' distributions (unaudited)................................................       (562)
  Net (loss) - three months ended March 31, 1996 (unaudited).......................     (1,849)
                                                                                     ---------
Balance at March 31, 1996 (unaudited)..............................................  $  15,777
                                                                                     ---------
                                                                                     ---------
</TABLE>
 
                            See accompanying notes.
 
                                      F-18
<PAGE>
                               ARDEN PREDECESSORS
 
                       COMBINED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                           THREE MONTHS     FOR THE YEARS ENDED DECEMBER
                                                                         ENDED MARCH 31,                31,
                                                                        ------------------  ----------------------------
                                                                          1996      1995      1995      1994      1993
                                                                        --------  --------  --------  --------  --------
                                                                           (UNAUDITED)
<S>                                                                     <C>       <C>       <C>       <C>       <C>
OPERATING ACTIVITIES
Net (loss) income.....................................................  $ (1,849) $     81  $ (1,215) $    784  $    691
Adjustments to reconcile net (loss) income to net cash provided by
  operating activities:
    Depreciation and amortization.....................................     2,396       879     4,373     2,184       528
    Amortization of loan costs and fees...............................       161        76       478        29         2
    (Increase) decrease in rents and other receivables................      (309)      157    (1,022)     (350)      (90)
    Increase in deferred rents........................................      (748)     (455)   (1,539)   (1,195)     (392)
    Increase in prepaid financing and leasing costs...................      (503)     (742)   (1,938)   (1,000)     (350)
    Decrease (increase) in prepaid expenses and other assets..........        62       117    (1,216)     (550)      (15)
    (Decrease) increase in accounts payable and accrued expenses......      (439)     (250)    3,925       996       712
    Increase in deferred interest.....................................     2,100        99     1,056     --        --
    Increase in security deposits.....................................       499       147     1,329       298       595
                                                                        --------  --------  --------  --------  --------
Net cash provided by operating activities.............................     1,370       109     4,231     1,196     1,681
                                                                        --------  --------  --------  --------  --------
INVESTING ACTIVITIES
Acquisitions and improvements to commercial office properties.........   (95,854)  (20,086) (150,022)  (45,804)  (62,907)
                                                                        --------  --------  --------  --------  --------
FINANCING ACTIVITIES
Proceeds from mortgage loans..........................................   100,946    23,039   181,832    33,329    60,677
Repayments of mortgage loans..........................................    (1,324)     (290)  (22,333)     (322)    --
Proceeds from unsecured lines of credit...............................        26       185     3,310     1,240       298
Repayments of unsecured lines of credit...............................      (250)     (418)   (3,245)     (790)     (250)
Increase in restricted cash...........................................    (8,330)     (732)  (12,963)   (1,314)     (694)
Owners' contributions.................................................     3,500     3,380     8,613    13,164     3,400
Owners' distributions.................................................      (562)   (5,815)   (8,683)   (1,453)     (460)
                                                                        --------  --------  --------  --------  --------
Net cash provided by financing activities.............................    94,006    19,349   146,531    43,854    62,971
                                                                        --------  --------  --------  --------  --------
Net (decrease) increase in cash and cash equivalents..................      (478)     (628)      740      (754)    1,745
Cash and cash equivalents at beginning of period......................     1,731       991       991     1,745     --
                                                                        --------  --------  --------  --------  --------
Cash and cash equivalents at end of period............................     1,253       363  $  1,731  $    991  $  1,745
                                                                        --------  --------  --------  --------  --------
                                                                        --------  --------  --------  --------  --------
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS
Cash paid during the period for interest, net of interest
  capitalized.........................................................  $  4,920  $  2,340  $ 11,069  $  4,590  $    520
                                                                        --------  --------  --------  --------  --------
                                                                        --------  --------  --------  --------  --------
</TABLE>
 
                            See accompanying notes.
 
                                      F-19
<PAGE>
                               ARDEN PREDECESSORS
                     NOTES TO COMBINED FINANCIAL STATEMENTS
 
1.  ORGANIZATION
    The  following entities  (the "Arden Predecessors")  are commonly controlled
and are currently engaged in owning, acquiring, managing, leasing and renovating
office properties in Southern California.  Arden Realty Group, Inc., a  Maryland
corporation,  will be formed as  a real estate investment  trust (the "REIT") to
continue and expand the business of the Arden Predecessors.
 
<TABLE>
<CAPTION>
                                                  PREDECESSORS
- -----------------------------------------------------------------------------------------------------------------
              ENTITY NAME                          PROPERTY NAME                    CITY         ACQUISITION DATE
- ---------------------------------------  ----------------------------------  ------------------  ----------------
<S>                                      <C>                                 <C>                 <C>
Arden Realty Group, Inc., a California
 Corporation                             Operating Management Company                --                 --
Century Center Associates, L.P.          Century Park Center                 Los Angeles         March 1993
Beverly Ventura Associates, L.P.         Beverly Atrium                      Beverly Hills       December 1993
                                         Woodland Hills Financial            Woodland Hills      December 1993
Bristol Encino Associates, LLC           Bristol Plaza                       Culver City         August 1994
                                         16000 Ventura Blvd.                 Encino              March 1995
1950 Sawtelle Associates, L.P.           1950 Sawtelle                       Los Angeles         June 1995
222 Harbor Associates, LLC               Anaheim City Centre                 Anaheim             November 1994
                                         425 West Broadway                   Glendale            December 1994
5000 Spring Associates, LLC              5000 East Spring                    Long Beach          December 1994
Arden LAOP IV, LLC                       70 South Lake                       Pasadena            November 1995
                                         The New Wilshire                    Los Angeles         November 1995
                                         Calabasas Commerce Center           Calabasas           November 1995
                                         Westwood Terrace                    Los Angeles         November 1995
                                         Skyview Center                      Los Angeles         November 1995
                                         5601 Lindero Canyon                 Westlake Village    March 1994
                                         4811 Airport Plaza Drive            Long Beach          November 1995
                                         4900/10 Airport Plaza Drive         Long Beach          November 1995
Arden LAOP V, LLC (Note 8)               5832 Bolsa                          Huntington Beach    February 1996
                                         400 Corporate Pointe                Culver City         February 1996
                                         9665 Wilshire                       Beverly Hills       February 1996
                                         Imperial Bank Tower                 San Diego           February 1996
Arden Broadway Associates, LLC           100 West Broadway                   Long Beach          To be acquired
REIT Acquisition Properties              303 Glenoaks Blvd.                  Burbank             To be acquired
                                         12501 East Imperial Highway         Norwalk             To be acquired
</TABLE>
 
PRINCIPLES OF COMBINATION
 
    The financial statements include the accounts of the Arden Predecessors on a
combined basis.  All significant  balances and  transactions between  the  Arden
Predecessors have been eliminated in combination.
 
PROPOSED TRANSACTIONS
 
    Concurrently  with the  consummation of  an initial  public offering  of the
REIT's Common Stock (the "Offering"), which is expected to be completed in 1996,
the REIT and a newly  formed limited partnership (the "Operating  Partnership"),
together  with  the partners  and members  of the  Arden Predecessors  and other
parties which  hold ownership  interests in  the properties  (collectively,  the
"Participants"),  will engage in certain  formation transactions (the "Formation
Transactions"). The Formation Transactions are  designed to (i) enable the  REIT
to  raise  the necessary  capital to  acquire the  properties and  repay certain
mortgage debt relating thereto, (ii) provide a vehicle for future  acquisitions,
(iii) enable the REIT to comply with
 
                                      F-20
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
1.  ORGANIZATION (CONTINUED)
certain  requirements under the federal income tax laws and regulations relating
to real estate investment trusts, (iv) facilitate potential securitized mortgage
financings and (v) preserve certain tax advantages for certain Participants.
 
    The operations  of  the  REIT  will be  carried  on  primarily  through  the
Operating  Partnership and its subsidiaries in order  to assist the REIT and the
Participants in forming the REIT under the Internal Revenue Code of 1986.
 
    The REIT will be the sole  general partner in the Operating Partnership  and
the  Participants will  transfer their property  and operating  interests in the
Arden  Predecessors  in  exchange  for  limited  partnership  interests  in  the
Operating Partnership and/or cash.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
RISKS AND UNCERTAINTIES
 
    The  preparation  of  financial  statements,  in  conformity  with generally
accepted accounting  principles,  requires  management  to  make  estimates  and
assumptions  that  affect the  reported amounts  of  assets and  liabilities and
disclosure of contingent  assets and liabilities  at the date  of the  financial
statements  and  the  reported  amounts  of  revenues  and  expenses  during the
reporting period. Actual results could differ from those estimates.
 
COMMERCIAL OFFICE PROPERTIES AND FURNITURE, FIXTURES AND EQUIPMENT
 
    The properties are recorded at cost less accumulated depreciation. The Arden
Predecessors  have  adopted  the  new  accounting  pronouncement,  Statement  of
Financial  Accounting Standards ("SFAS") No. 121, "Accounting for the Impairment
of Long-Lived Assets and  for Long-Lived Assets to  be Disposed of." Under  this
standard,  if  impairment  conditions  exist,  the  Arden  Predecessors  make an
assessment of the recoverability  of the carrying amounts  of the properties  by
estimating  the future undiscounted  cash flows, excluding  interest charges. If
the  carrying  amount  exceeds  the  aggregate  future  cash  flows,  the  Arden
Predecessors  would  recognize an  impairment loss  to  the extent  the carrying
amount exceeds  the fair  value of  the property.  Any long-lived  assets to  be
disposed  of are to be valued at estimated  fair value less costs to sell. Based
on such  periodic  assessments, no  impairments  have or  currently  exist  and,
therefore, no real estate carrying amounts have been adjusted.
 
    Repairs   and  maintenance  are  expensed   as  incurred.  Replacements  and
betterments in  excess  of  $500  are capitalized  and  depreciated  over  their
estimated useful lives.
 
    Depreciation  is calculated  using the  straight-line method  and forty year
lives for buildings and ten  year lives for building improvements.  Amortization
of  tenant improvements  is calculated using  the straight-line  method over the
estimated life of the related lease.
 
CASH EQUIVALENTS
 
    Cash  equivalents  consist  of  highly  liquid  investments  with   original
maturities of three months or less when acquired.
 
RESTRICTED CASH
 
    Restricted  cash  consists  of cash  held  as collateral  to  provide credit
enhancement for certain  mortgage loans  payable and cash  reserves for  capital
expenditures,  tenant improvements,  security deposits  and property  taxes. All
restricted cash is  controlled directly  or indirectly by  the related  mortgage
lenders.
 
PREPAID COSTS
 
    Deferred leasing commissions are amortized on a straight-line basis over the
life of the related lease.
 
                                      F-21
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    Fees  and costs incurred in obtaining long-term financing are amortized over
the terms of the related loan agreements.
 
REVENUE RECOGNITION
 
    Minimum rent, including  rental abatements and  contractual fixed  increases
attributable  to operating leases,  is recognized on  a straight-line basis over
the term of the related  lease. Amounts expected to  be received in later  years
are  included in deferred rents. Property operating cost reimbursements due from
tenants for common  area maintenance,  real estate taxes  and other  recoverable
costs are recognized in the period the expenses are incurred.
 
FAIR VALUE OF FINANCIAL INSTRUMENTS
 
    The  mortgage loans payable  of the Arden  Predecessors consist primarily of
mortgage loans  which provide  for  variable indexed  rates  and in  most  cases
participation  or significant additional interest  due at maturity. Accordingly,
management believes the carrying  values of such  loans either approximate  fair
values  or it  is not  practical to  determine fair  values due  to the  lack of
availability of market information for similar financial instruments. Other than
the mortgage loans payable, the Arden Predecessors believe the carrying  amounts
of their financial instruments approximate their fair values.
 
INCOME TAXES
 
    The  entities that make up the Arden  Predecessors consist of a Subchapter S
corporation, limited  liability companies  and partnerships.  Taxable income  is
recorded  on  the  separate  tax  returns of  the  membership  unit  holders and
individual partners and,  accordingly, no  provision for income  taxes has  been
recorded in the accompanying financial statements.
 
PER SHARE DATA
 
    Per  share data  is not relevant  since the Arden  Predecessors represents a
presentation  of  the  combined   operations  of  a   group  of  companies   and
partnerships.
 
UNAUDITED INTERIM STATEMENTS
 
    The  combined financial statements  as of March  31, 1996 and  for the three
months ended  March  31,  1996  and  1995  are  unaudited.  In  the  opinion  of
management,  such financial statements  reflect all adjustments  necessary for a
fair presentation of  the results of  the respective interim  periods. All  such
adjustments are of a normal, recurring nature.
 
3.  COMMERCIAL OFFICE PROPERTIES
    Commercial office properties, including office buildings and related parking
facilities, are as follows:
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                                        ----------------------
                                                                           1995        1994
                                                                        ----------  ----------
                                                                            (IN THOUSANDS)
<S>                                                                     <C>         <C>
Land..................................................................  $   40,445  $   22,498
Building..............................................................     198,669      81,859
Building improvements.................................................      14,856       1,368
Tenant improvements...................................................       4,763       2,986
                                                                        ----------  ----------
                                                                           258,733     108,711
Accumulated depreciation..............................................      (6,651)     (2,576)
                                                                        ----------  ----------
                                                                        $  252,082  $  106,135
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
                                      F-22
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
3.  COMMERCIAL OFFICE PROPERTIES (CONTINUED)
    The  Arden Predecessors capitalize  interest and taxes  related to buildings
under construction and renovation, including tenant improvements, to the  extent
such  assets qualify for capitalization. Total interest capitalized was $39,000,
$270,000, and $319,000  for the years  ended December 31,  1995, 1994 and  1993,
respectively.
 
    All commercial office properties are encumbered by mortgages (Note 4).
 
    Office  space in the  properties is generally leased  to tenants under lease
terms which provide for the tenants  to pay for increases in operating  expenses
in excess of specified amounts.
 
    Noncancelable  operating leases with tenants expire on various dates through
2011. The future minimum lease payments to be received under leases existing  as
of December 31, 1995, are as follows:
 
<TABLE>
<S>                                                      <C>
1996...................................................  $57,330,000
1997...................................................  52,441,000
1998...................................................  44,008,000
1999...................................................  36,741,000
2000...................................................  28,364,000
Thereafter.............................................  73,593,000
</TABLE>
 
    The  above future minimum  lease payments do  not include specified payments
for tenant reimbursements of operating expenses.
 
    The Arden Predecessors lease  the land underlying  the office buildings  and
parking  structures of  5000 East  Spring Street,  4811 Airport  Plaza Drive and
4900/10 Airport Plaza Drive  from the city  of Long Beach.  They also lease  the
land  under the parking  structure at the  Anaheim City Centre  from the Anaheim
Redevelopment Agency.
 
    Future minimum  ground  lease payments  due  under existing  ground  leases,
including  properties acquired subsequent to December  31, 1995 (Note 8), are as
follows:
 
<TABLE>
<S>                                                      <C>
1996...................................................  $1,437,000
1997...................................................   1,440,000
1998...................................................   1,440,000
1999...................................................   1,506,000
2000...................................................   1,130,000
Thereafter.............................................  60,419,000
</TABLE>
 
                                      F-23
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
4.  MORTGAGE LOANS PAYABLE AND UNSECURED LINES OF CREDIT
 
<TABLE>
<CAPTION>
                                                                                       DECEMBER 31,
                                                                               -----------------------------
                                                                                    1995           1994
                                                                               --------------  -------------
<S>                                                                            <C>             <C>
MORTGAGE LOANS DUE TO LEHMAN CAPITAL, A DIVISION OF LEHMAN BROTHERS  HOLDINGS
INC. (LEHMAN)
A  mortgage loan, dated November 20, 1995, secured by seven first trust deeds
and one second trust deed on real property, bearing interest at LIBOR (with a
floor on LIBOR of 5.5%) plus a margin of 3.0%. Interest only payments are  to
be  made monthly and all principal and unpaid interest is due on November 20,
1998. The loan agreement provides for additional interest to be deferred  and
paid  at maturity in  the amount of $10,560,000  (Tier I Additional Interest)
which increases the day after each of the first and second anniversary  dates
of  the loan by $2,640,000, or 2%  of the original principal balance (Tier II
and Tier III Additional  Interest, respectively). At  December 31, 1995,  the
Arden Predecessors had recorded $586,000 of additional interest, resulting in
an  effective interest  rate of approximately  11.3%. Effective  on the first
anniversary date of the loan, the Arden Predecessors are required to maintain
a debt service coverage ratio of 1.25:1.0                                      $  132,000,000  $   6,741,000
A mortgage loan, dated June 13, 1995,  secured by a first trust deed on  real
property,  bearing interest  at LIBOR, plus  a margin of  4.5%. Interest only
payments are due monthly and all principal and unpaid interest is due on June
13, 1997. The loan agreement  provides for additional interest of  $1,100,000
to  be deferred and repaid  at maturity (Tier I  Additional Interest). If the
loan is extended for an additional twelve months, the Arden Predecessors  are
to  pay  an  additional  interest  amount  of  $600,000  (Tier  II Additional
Interest). As  of December  31,  1995, the  Arden Predecessors  had  recorded
$298,000  of additional interest, resulting in  an effective interest rate of
15.6%. Effective  on  the first  anniversary  date  of the  loan,  the  Arden
Predecessors are required to maintain a debt service coverage ratio 1.15:1.0       10,200,000       --
 
MORTGAGE LOANS DUE TO MORTGAGE BANKERS
Two   mortgage  loans,  dated  December  23,  1993,  secured  by  two  cross-
collateralized first trust deeds  on real property,  bearing interest at  the
lender's  composite commercial  rate, which was  5.53% at  December 31, 1995,
plus a margin of 3.25%. Interest only payments are due monthly and  principal
payments are due periodically based on a portion of operating cash flows from
the property. All unpaid principal and interest is due on December 31, 2000        37,854,000     36,748,000
</TABLE>
 
                                      F-24
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
4.  MORTGAGE LOANS PAYABLE AND UNSECURED LINES OF CREDIT (CONTINUED)
 
<TABLE>
<CAPTION>
                                                                                       DECEMBER 31,
                                                                               -----------------------------
                                                                                    1995           1994
                                                                               --------------  -------------
<S>                                                                            <C>             <C>
Two mortgage loans, dated March 15, 1995, secured by two cross-collateralized
first  trust deeds on real property, bearing interest at LIBOR, plus a margin
of 4.5%.  Interest only  payments  are due  monthly,  and all  principal  and
interest  is due  on March  15, 1997.  This loan  has an  additional interest
requirement of $434,000 or approximately 2.0% of the principal balance to  be
deferred  and paid at maturity. At  December 31, 1995, the Arden Predecessors
had recorded  $172,000  of additional  interest,  resulting in  an  effective
interest  rate of  11.5%. The Arden  Predecessors are required  to maintain a
debt service coverage ratio, as defined in the Loan Agreement, of 1.20:1.0         22,351,000       --
 
MORTGAGE LOANS DUE TO BANKS
A mortgage loan, dated March 1, 1993,  secured by a first trust deed on  real
property,  bearing interest, at the Arden Predecessor's option, at LIBOR plus
a margin of  1.0%, the treasury  rate plus a  margin of 1.75%,  or the  Prime
Rate.  Interest only payments are due monthly. Monthly payments of principal,
begin March 1, 1996. The mortgage loan matures March 1, 2003                       25,438,000     25,455,000
A mortgage loan,  dated December  23, 1994, secured  by a  first trust  deed,
bearing  interest at LIBOR, plus a margin of 3.75%, or a periodic fixed rate,
at the  option of  the Arden  Predecessors. Interest  only payments  are  due
monthly,  and the principal  and all unpaid  interest is due  on December 23,
1997                                                                               14,880,000     14,880,000
A mortgage loan,  dated December  14, 1994, secured  by a  first trust  deed,
bearing  interest at the  Eleventh District Monthly  Weighted Average Cost of
Funds Rate, as  calculated by the  Federal Home Loan  Bank of San  Francisco,
which  was 5.059% at December 31, 1995, plus a margin of 3.75%. Interest only
payments are due monthly,  and principal and all  unpaid interest are due  on
January 1, 2005                                                                    10,460,000      9,860,000
                                                                               --------------  -------------
    Total mortgage loans payable                                               $  253,183,000  $  93,684,000
                                                                               --------------  -------------
                                                                               --------------  -------------
</TABLE>
 
    The LIBOR rate was 5.72% at December 31, 1995.
 
    Two  of the mortgage loans  provide for participation by  the lender in cash
flow upon sale or other disposition, as  defined by the Loan Agreements, of  the
properties.
 
    Certain  mortgage  loans  provide  for  additional  funds  to  be  drawn for
qualified and  approved tenant  improvements,  leasing commissions  and  capital
improvements.  The aggregate amount of funds available for disbursement from all
lending institutions  was approximately  $9,790,000. As  of December  31,  1995,
total funds drawn for these purposes was $6,537,000, and the undisbursed portion
was $3,253,000.
 
    The  Arden Predecessors have  three unsecured lines of  credit, with a total
commitment of $2,713,000,  from two  domestic banks.  The aggregate  outstanding
balance  was $813,000  at December  31, 1995. The  lines accrue  interest at the
Prime Rate. The undisbursed portion at December 31, 1995 was $1,900,000.
 
                                      F-25
<PAGE>
                               ARDEN PREDECESSORS
             NOTES TO COMBINED FINANCIAL STATEMENTS -- (CONTINUED)
 
4.  MORTGAGE LOANS PAYABLE AND UNSECURED LINES OF CREDIT (CONTINUED)
    As of December 31, 1995, the  scheduled principal payments for the  mortgage
loans payable and unsecured lines of credit are as follows:
 
<TABLE>
<S>                                                     <C>
1996                                                    $ 1,490,000
1997..................................................   48,206,000
1998..................................................  155,119,000
1999..................................................      901,000
2000..................................................   16,305,000
Thereafter............................................   31,975,000
                                                        -----------
                                                        $253,996,000
                                                        -----------
                                                        -----------
</TABLE>
 
5.  EXTRAORDINARY LOSS
    During 1994, the Arden Predecessors incurred losses on certain properties as
a result of an earthquake in Los Angeles, California.
 
6.  COMMITMENTS AND CONTINGENCIES
 
CONCENTRATION OF CREDIT RISK
 
    The  Arden  Predecessors'  maintain  their  cash  and  cash  equivalents  at
financial institutions.  The  combined  account  balances  at  each  institution
periodically  exceeds  FDIC insurance  coverage, and,  as a  result, there  is a
concentration of credit  risk related to  amounts on deposit  in excess of  FDIC
insurance  coverage. Management of the Arden Predecessors believes that the risk
is not significant.
 
OFFICE RENT EXPENSE
 
    The Arden Predecessors  lease office  space for its  corporate offices.  The
future minimum rental payments due under the terms of the lease are $123,000 for
each  of the next  four years and $62,000  in the final  year. The lease expires
June 30, 2000. The Arden Predecessors have the right to renew the lease for two,
one-year terms prior to expiration of the initial lease term.
 
LITIGATION
 
    Management  of  the  Arden  Predecessors  does  not  believe  there  is  any
litigation   threatened  against  the  Arden  Predecessors  other  than  routine
litigation arising out  of the  ordinary course of  business, some  of which  is
expected  to be covered by liability insurance  and all of which is not expected
to have a material  adverse effect on the  combined financial statements of  the
Arden Predecessors.
 
7.  RELATED PARTY TRANSACTIONS
    Included  in other income are management  overhead fees of $95,000, $213,000
and $137,000 for  1995, 1994,  and 1993, respectively,  from various  affiliated
partnerships.
 
    Included in accounts receivable are $27,900, $57,800 and $56,000 at December
31, 1995, 1994, and 1993, respectively, from various affiliated partnerships.
 
8.  PROPERTY ACQUISITIONS
    Subsequent  to  December 31,  1995,  the Participants'  purchased additional
properties with an  aggregate purchase price  of $93,740,000. The  Participants'
incurred  $100,000,000  of  debt  from  Lehman Brothers,  Inc.  as  a  result of
financing the purchase, of  which $8,053,000 was retained  in a restricted  cash
account  to be  used for tenant  improvements, capital  improvements and leasing
commissions.
 
                                      F-26
<PAGE>
                               ARDEN PREDECESSORS
                                  SCHEDULE III
           COMMERCIAL OFFICE PROPERTIES AND ACCUMULATED DEPRECIATION
                               DECEMBER 31, 1995
                    (IN THOUSANDS, EXCEPT SQUARE FOOT DATA)
<TABLE>
<CAPTION>
                                                                                            COSTS
                                                                                         CAPTIALIZED
                                                                 INITIAL COSTS          SUBSEQUENT TO          TOTAL COSTS
                                                            ------------------------     ACQUISITION     ------------------------
                                                  SQUARE               BUILDINGS AND  -----------------             BUILDINGS AND
PROPERTY NAME                                     FOOTAGE     LAND     IMPROVEMENTS   IMPROVEMENTS (4)     LAND     IMPROVEMENTS
- -----------------------------------------------  ---------  ---------  -------------  -----------------  ---------  -------------
<S>                                              <C>        <C>        <C>            <C>                <C>        <C>
Century Park Center............................    247,310  $   7,189    $  16,742        $   4,472      $   7,189    $  21,214
Beverly Atrium.................................     61,314      4,127       11,513              600          4,127       12,113
Woodland Hills Financial.......................    223,523      6,566       14,754            1,715          6,566       16,469
Bristol Plaza..................................     84,014      1,820        3,380              185          1,820        3,565
16000 Ventura Blvd.............................     77,304      1,700       17,189              571          1,700       17,760
1950 Sawtelle..................................    103,620      1,988        7,263              107          1,988        7,370
Anaheim City Centre............................    175,391        515       11,199              240            515       11,439
425 West Broadway..............................     71,489      1,500        4,436              187          1,500        4,623
5000 Spring Street.............................    163,358     --           11,658              707         --           12,365
70 South Lake..................................    100,133      1,360        9,097           --              1,360        9,097
The New Wilshire...............................    202,565      1,200       19,902                4          1,200       19,906
Calabasas Commerce Center......................    123,121      1,262        9,725           --              1,262        9,725
Westwood Terrace...............................    135,584      2,103       16,850               37          2,103       16,887
Skyview Center.................................    386,294      6,514       33,702           --              6,514       33,702
5601 Lindero Canyon............................    105,830      2,600        6,067            1,535          2,600        7,602
4811 Airport Plaza Drive and 4900\10 Airport
 Plaza Drive...................................    272,013     --           14,452           --             --           14,452
                                                 ---------  ---------  -------------        -------      ---------  -------------
                                                 2,632,863  $  40,444    $ 207,929        $  10,360      $  40,444    $ 218,289
                                                 ---------  ---------  -------------        -------      ---------  -------------
                                                 ---------  ---------  -------------        -------      ---------  -------------
 
<CAPTION>
 
                                                               ACCUMULATED                       YEAR
PROPERTY NAME                                      TOTAL    DEPRECIATION (1)   ENCUMBRANCES      BUILT
- -----------------------------------------------  ---------  -----------------  -------------     -----
<S>                                              <C>        <C>                <C>            <C>
Century Park Center............................  $  28,403      $   2,357        $  25,437          1972
Beverly Atrium.................................     16,240            790           15,571(2)       1989
Woodland Hills Financial.......................     23,035          1,177           22,284(2)       1972
Bristol Plaza..................................      5,385            114            5,200          1982
16000 Ventura Blvd.............................     19,460            313           17,151          1980
1950 Sawtelle..................................      9,358            131           10,200          1988
Anaheim City Centre............................     11,954            437            9,880          1986
425 West Broadway..............................      6,123            163            5,000          1984
5000 Spring Street.............................     12,365            360           10,460          1989
70 South Lake..................................     10,457             33           11,000(3)       1982
The New Wilshire...............................     21,106             72           22,000(3)       1989
Calabasas Commerce Center......................     10,987             42           11,800(3)       1990
Westwood Terrace...............................     18,990             68           21,000(3)       1988
Skyview Center.................................     40,216            128           41,200(3)       1981
5601 Lindero Canyon............................     10,202            427           10,400(3)       1989
4811 Airport Plaza Drive and 4900\10 Airport
 Plaza Drive...................................     14,452             39           14,600(3)       1987
                                                 ---------         ------      -------------       -----
                                                 $ 258,733      $   6,651        $ 253,183
                                                 ---------         ------      -------------       -----
                                                 ---------         ------      -------------       -----
</TABLE>
 
(1) The depreciable  life for  buildings and  improvements ranges  from five  to
    forty years.
 
(2) Each of these properties is collateral for both loans.
 
(3)  All  of  these  properties  are collateral  for  a  mortgage  loan totaling
    $132,000,000. The encumbrance allocated to  an individual property is  based
    on the related individual release price.
 
(4) Includes total capitalized interest of $628,000
 
                                      F-27
<PAGE>
    A  summary  of  activity  of commercial  office  properties  and accumulated
depreciation is as follows:
<TABLE>
<CAPTION>
                                                                         COMMERCIAL OFFICE PROPERTIES
                                                                       ---------------------------------
                                                                                 DECEMBER 31,
                                                                       ---------------------------------
                                                                          1995        1994       1993
                                                                       ----------  ----------  ---------
<S>                                                                    <C>         <C>         <C>
Balance at beginning of period.......................................  $  108,711  $   62,902  $  --
Improvements.........................................................       5,715       2,797      1,848
Acquisition of land, building and improvements.......................     144,307      43,012     61,054
                                                                       ----------  ----------  ---------
Balance at end of period.............................................  $  258,733  $  108,711  $  62,902
                                                                       ----------  ----------  ---------
                                                                       ----------  ----------  ---------
 
<CAPTION>
 
                                                                           ACCUMULATED DEPRECIATION
                                                                       ---------------------------------
                                                                                 DECEMBER 31,
                                                                       ---------------------------------
                                                                          1995        1994       1993
                                                                       ----------  ----------  ---------
<S>                                                                    <C>         <C>         <C>
Balance at beginning of period.......................................  $    2,529  $      510  $  --
Depreciation expense.................................................       4,122       2,065  $     510
                                                                       ----------  ----------  ---------
Balance at end of period.............................................  $    6,651  $    2,575  $     510
                                                                       ----------  ----------  ---------
                                                                       ----------  ----------  ---------
</TABLE>
 
                                      F-28
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors
Arden Realty Group, Inc.
 
    We have audited the accompanying  combined statement of revenue and  certain
expenses  of the 1995 Acquired Properties for  the year ended December 31, 1995.
This combined statement of revenue and certain expenses is the responsibility of
the management of the 1995 Acquired Properties. Our responsibility is to express
an opinion on the  combined statement of revenue  and certain expenses based  on
our audit.
 
    We  conducted  our  audit  in accordance  with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the combined statement of revenue and certain
expenses  is free  of material misstatement.  An audit includes  examining, on a
test basis, evidence  supporting the  amounts and disclosures  in the  financial
statement.  An audit also includes assessing  the accounting principles used and
significant estimates  made by  management, as  well as  evaluating the  overall
financial   statement  presentation.  We  believe  that  our  audit  provides  a
reasonable basis for our opinion.
 
    The accompanying  combined statement  of revenue  and certain  expenses  was
prepared  for the  purpose of  complying with the  rules and  regulations of the
Securities and Exchange Commission for  inclusion in the registration  statement
on  Form S-11 of Arden Realty Group, Inc. Certain expenses (described in Note 1)
that would  not  be comparable  to  those  resulting from  the  proposed  future
operations  of the properties are excluded and  the statement is not intended to
be a complete presentation of the revenue and expenses of the properties.
 
    In our  opinion, the  combined  statement of  revenue and  certain  expenses
presents  fairly, in  all material  respects, the  combined revenue  and certain
expenses, as defined above, of the  1995 Acquired Properties for the year  ended
December 31, 1995, in conformity with generally accepted accounting principles.
 
                                          Ernst & Young LLP
 
Los Angeles, California
April 10, 1996
 
                                      F-29
<PAGE>
                            1995 ACQUIRED PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                             THREE MONTHS ENDED   FOR THE YEAR
                                                                               MARCH 31, 1995        ENDED
                                                                            --------------------  DECEMBER 31,
                                                                              1996       1995         1995
                                                                            ---------  ---------  ------------
                                                                                (UNAUDITED)
<S>                                                                         <C>        <C>        <C>
REVENUE
  Rental..................................................................  $   5,549  $   5,159   $   21,791
  Tenant reimbursements...................................................        413        318        1,233
  Parking.................................................................        799        732        2,822
  Other...................................................................        118        119          972
                                                                            ---------  ---------  ------------
    Total revenue.........................................................      6,879      6,328       26,818
                                                                            ---------  ---------  ------------
CERTAIN EXPENSES
  Property operating and maintenance......................................      1,193      1,378        5,808
  Property general and administrative.....................................        169        145          952
  Real estate taxes.......................................................        418        579        2,288
  Insurance...............................................................        421        118          809
  Ground rent.............................................................         44         44          174
  Bad debts...............................................................          0         97          885
  Other...................................................................          0         50          118
                                                                            ---------  ---------  ------------
    Total certain expenses................................................      2,245      2,411       11,034
                                                                            ---------  ---------  ------------
      Excess of revenue over certain expenses.............................  $   4,634  $   3,917   $   15,784
                                                                            ---------  ---------  ------------
                                                                            ---------  ---------  ------------
</TABLE>
 
 See accompanying notes to combined statements of revenue and certain expenses.
 
                                      F-30
<PAGE>
                            1995 ACQUIRED PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
ORGANIZATION
 
    The accompanying combined statements of revenue and certain expenses include
the combined operations of nine commercial office properties located in Southern
California  which were  acquired by  the Arden  Predecessors in  1995 (the "1995
Acquired Properties")  and  are  currently  owned or  controlled  by  the  Arden
Predecessors.
 
    The 1995 Acquired Properties are as follows:
 
<TABLE>
<CAPTION>
                                        SOUTHERN        APPROXIMATE
                                       CALIFORNIA         RENTABLE
          PROPERTY NAME                 LOCATION       SQUARE FOOTAGE   ACQUISITION DATE
- ---------------------------------  ------------------  --------------  ------------------
<S>                                <C>                 <C>             <C>
16000 Ventura Blvd.                Encino                    178,341   March 1995
1950 Sawtelle                      Los Angeles               103,620   June 1995
Westwood Terrace                   Los Angeles               135,583   November 1995
Skyview Center                     Los Angeles               386,294   November 1995
4811 Airport Plaza Drive and
4900\10 Airport Plaza Drive        Long Beach                272,013   November 1995
The New Wilshire                   Los Angeles               202,544   November 1995
70 South Lake                      Pasadena                  100,133   November 1995
Calabasas Commerce Center          Calabasas                 123,121   November 1995
                                                       --------------
                                                           1,501,649
                                                       --------------
                                                       --------------
</TABLE>
 
BASIS OF PRESENTATION
 
    The  accompanying  statements were  prepared to  comply  with the  rules and
regulations of  the Securities  and  Exchange Commission  for inclusion  in  the
registration  statement on  Form S-11  of Arden  Realty Group,  Inc., a Maryland
corporation (the "Company").
 
    The accounts of  each of the  1995 Acquired Properties  are combined in  the
statements  of  revenue  and certain  expenses  and there  are  no interproperty
accounts to be eliminated. The accompanying statements are not representative of
the actual operations for the periods presented as certain expenses that may not
be comparable to  the expenses expected  to be  incurred by the  Company in  the
future  operations of the 1995 Acquired  Properties have been excluded. Excluded
expenses consist of interest, depreciation and amortization and property general
and administrative costs not directly comparable to the future operations of the
1995 Acquired Properties.
 
REVENUE RECOGNITION
 
    Rental revenue is recognized on a straight-line basis over the terms of  the
related leases.
 
RISKS AND UNCERTAINTIES
 
    The  preparation  of  financial  statements,  in  conformity  with generally
accepted accounting  principles,  requires  management  to  make  estimates  and
assumptions  that affect the reported amounts of revenue and expenses during the
reporting period. Actual results could differ from those estimates.
 
UNAUDITED INTERIM STATEMENT
 
    The combined statements of revenue and certain expenses for the three months
ended March 31, 1996 and 1995 are unaudited. In the opinion of management,  such
financial  statements reflect all adjustments  necessary for a fair presentation
of the results of the respective interim periods. All such adjustments are of  a
normal, recurring nature.
 
                                      F-31
<PAGE>
                            1995 ACQUIRED PROPERTIES
 
  NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES -- (CONTINUED)
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
2.  COMMERCIAL OFFICE PROPERTIES
    The  future minimum lease  payments to be  received under existing operating
leases as of December 31, 1995 are as follows:
 
<TABLE>
<S>                                                              <C>
1996...........................................................  $22,798,000
1997...........................................................  20,099,000
1998...........................................................  15,474,000
1999...........................................................  12,042,000
2000...........................................................   9,394,000
Thereafter.....................................................  27,609,000
</TABLE>
 
    The above future minimum  lease payments do  not include specified  payments
for tenant reimbursements of operating expenses.
 
    Office  space in the 1995 Acquired Properties is generally leased to tenants
under lease  terms  which  provide for  the  tenants  to pay  for  increases  in
operating expenses in excess of specified amounts.
 
                                      F-32
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors
Arden Realty Group, Inc.
 
    We  have audited the accompanying combined  statement of revenue and certain
expenses of the 1996 Acquired Properties  for the year ended December 31,  1995.
This combined statement of revenue and certain expenses is the responsibility of
the management of the 1996 Acquired Properties. Our responsibility is to express
an  opinion on the combined  statement of revenue and  certain expenses based on
our audit.
 
    We conducted  our  audit  in accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the combined statement of revenue and certain
expenses is free  of material misstatement.  An audit includes  examining, on  a
test  basis, evidence  supporting the amounts  and disclosures  in the financial
statement. An audit also includes  assessing the accounting principles used  and
significant  estimates made  by management,  as well  as evaluating  the overall
financial  statement  presentation.  We  believe  that  our  audit  provides   a
reasonable basis for our opinion.
 
    The  accompanying  combined statement  of revenue  and certain  expenses was
prepared for the  purpose of  complying with the  rules and  regulations of  the
Securities  and Exchange Commission for  inclusion in the registration statement
on Form S-11 of Arden Realty Group, Inc. Certain expenses (described in Note  1)
that  would  not  be comparable  to  those  resulting from  the  proposed future
operations of the properties are excluded  and the statement is not intended  to
be a complete presentation of the revenue and expenses of the properties.
 
    In  our  opinion, the  combined statement  of  revenue and  certain expenses
presents fairly,  in all  material respects,  the combined  revenue and  certain
expenses,  as defined above, of the 1996  Acquired Properties for the year ended
December 31, 1995, in conformity with generally accepted accounting principles.
 
                                          Ernst & Young LLP
 
Los Angeles, California
April 10, 1996
 
                                      F-33
<PAGE>
                            1996 ACQUIRED PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                   THREE MONTHS ENDED
                                                                                                        FOR THE YEAR
                                                                                       MARCH 31,           ENDED
                                                                                  --------------------  DECEMBER 31,
                                                                                    1996       1995         1995
                                                                                  ---------  ---------  ------------
                                                                                      (UNAUDITED)
<S>                                                                               <C>        <C>        <C>
REVENUE
  Rental........................................................................  $   5,019  $   4,856   $   19,391
  Tenant reimbursements.........................................................        309        182          961
  Parking.......................................................................        459        449        1,859
  Other.........................................................................         73         78          350
                                                                                  ---------  ---------  ------------
    Total revenue...............................................................      5,860      5,565       22,561
                                                                                  ---------  ---------  ------------
                                                                                  ---------  ---------  ------------
 
CERTAIN EXPENSES
  Property operating and maintenance............................................      1,206      1,156        4,888
  Property general and administrative...........................................        133         75          513
  Real estate taxes.............................................................        360        470        1,753
  Insurance.....................................................................        471        156          521
  Ground rent...................................................................        232        267        1,067
  Bad debts.....................................................................          0          0          106
                                                                                  ---------  ---------  ------------
    Total certain expenses......................................................      2,402      2,124        8,848
                                                                                  ---------  ---------  ------------
      Excess of revenue over certain expenses...................................  $   3,458  $   3,441   $   13,713
                                                                                  ---------  ---------  ------------
                                                                                  ---------  ---------  ------------
</TABLE>
 
 See accompanying notes to combined statements of revenue and certain expenses.
 
                                      F-34
<PAGE>
                            1996 ACQUIRED PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
ORGANIZATION
 
    The accompanying combined statements of revenue and certain expenses include
the combined operations of five commercial office properties located in Southern
California which were  acquired or  are scheduled to  be acquired  by the  Arden
Predecessors  in  1996  (the "1996  Acquired  Properties")  and are  or  will be
currently owned or controlled by the Arden Predecessors prior to the Offering.
 
    The 1996 Acquired Properties are as follows:
 
<TABLE>
<CAPTION>
                                                   APPROXIMATE
                            SOUTHERN CALIFORNIA      RENTABLE        ACQUISITION
      PROPERTY NAME               LOCATION        SQUARE FOOTAGE        DATE
- --------------------------  --------------------  --------------  -----------------
<S>                         <C>                   <C>             <C>
5832 Bolsa                  Huntington Beach             49,355     February 1996
400 Corporate Pointe        Culver City                 164,845     February 1996
9665 Wilshire               Beverly Hills               158,345     February 1996
Imperial Bank Tower         San Diego                   547,578     February 1996
100 Broadway                Long Beach                  191,727    To be acquired
                                                  --------------
                                                      1,111,850
                                                  --------------
                                                  --------------
</TABLE>
 
BASIS OF PRESENTATION
 
    The accompanying  statements were  prepared  to comply  with the  rules  and
regulations  of  the Securities  and Exchange  Commission  for inclusion  in the
registration statement on  Form S-11  of Arden  Realty Group,  Inc., a  Maryland
corporation (the "Company").
 
    The  accounts of each  of the 1996  Acquired Properties are  combined in the
statements of  revenue  and certain  expenses  and there  are  no  interproperty
accounts to be eliminated. The accompanying statements are not representative of
the actual operations for the periods presented as certain expenses that may not
be  comparable to  the expenses expected  to be  incurred by the  Company in the
future operations of the 1996  Acquired Properties have been excluded.  Excluded
expenses consist of interest, depreciation and amortization and property general
and administrative costs not directly comparable to the future operations of the
1996 Acquired Properties.
 
    The property known as 100 Broadway will be acquired by the Arden Predecessor
prior to the Offering and Formation Transactions.
 
REVENUE RECOGNITION
 
    Rental  revenue is recognized on a straight-line basis over the terms of the
related leases.
 
RISKS AND UNCERTAINTIES
 
    The preparation  of  financial  statements,  in  conformity  with  generally
accepted  accounting  principles,  requires  management  to  make  estimates and
assumptions that affect the reported amounts of revenue and expenses during  the
reporting period. Actual results could differ from those estimates.
 
UNAUDITED INTERIM STATEMENT
 
    The combined statements of revenue and certain expenses for the three months
ended  March 31, 1996 and 1995 are unaudited. In the opinion of management, such
financial statements reflect all adjustments  necessary for a fair  presentation
of  the results of the respective interim periods. All such adjustments are of a
normal, recurring nature.
 
                                      F-35
<PAGE>
                            1996 ACQUIRED PROPERTIES
 
  NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES -- (CONTINUED)
 
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
2.  COMMERCIAL OFFICE PROPERTIES
    The future minimum lease  payments to be  received under existing  operating
leases as of December 31, 1995 are as follows:
 
<TABLE>
<S>                                              <C>
1996...........................................  $19,849,000
1997...........................................  18,159,000
1998...........................................  16,405,000
1999...........................................  15,866,000
2000...........................................  14,204,000
Thereafter.....................................  34,774,000
</TABLE>
 
    The  above future minimum  lease payments do  not include specified payments
for tenant reimbursements of operating expenses.
 
    Office space in the 1996 Acquired Properties is generally leased to  tenants
under  lease  terms  which provide  for  the  tenants to  pay  for  increases in
operating expenses in excess of specified amounts.
 
                                      F-36
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
To the Board of Directors
Arden Realty Group, Inc.
 
    We have audited the accompanying  combined statement of revenue and  certain
expenses  of the  Acquisition Properties for  the year ended  December 31, 1995.
This combined statement of revenue and certain expenses is the responsibility of
the management of the Acquisition  Properties. Our responsibility is to  express
an  opinion on the combined  statement of revenue and  certain expenses based on
our audit.
 
    We conducted  our  audit  in accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the combined statement of revenue and certain
expenses is free  of material misstatement.  An audit includes  examining, on  a
test  basis, evidence  supporting the amounts  and disclosures  in the financial
statement. An audit also includes  assessing the accounting principles used  and
significant  estimates made  by management,  as well  as evaluating  the overall
financial  statement  presentation.  We  believe  that  our  audit  provides   a
reasonable basis for our opinion.
 
    The  accompanying  combined statement  of revenue  and certain  expenses was
prepared for the  purpose of  complying with the  rules and  regulations of  the
Securities  and Exchange Commission for  inclusion in the registration statement
on Form S-11 of Arden Realty Group, Inc. Certain expenses (described in Note  1)
that  would  not  be comparable  to  those  resulting from  the  proposed future
operations of the properties are excluded  and the statement is not intended  to
be a complete presentation of the revenue and expenses of the properties.
 
    In  our  opinion, the  combined statement  of  revenue and  certain expenses
presents fairly,  in all  material respects,  the combined  revenue and  certain
expenses,  as defined  above, of the  Acquisition Properties for  the year ended
December 31, 1995, in conformity with generally accepted accounting principles.
 
                                          Ernst & Young LLP
 
Los Angeles, California
April 19, 1996
 
                                      F-37
<PAGE>
                             ACQUISITION PROPERTIES
 
              COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                   THREE MONTHS ENDED
                                                                                                        FOR THE YEAR
                                                                                       MARCH 31,            ENDED
                                                                                  --------------------  DECEMBER 31,
                                                                                    1996       1995         1995
                                                                                  ---------  ---------  -------------
                                                                                      (UNAUDITED)
<S>                                                                               <C>        <C>        <C>
REVENUE
  Rental........................................................................  $     942  $   1,165    $   4,280
  Tenant reimbursements.........................................................         17          3           54
  Parking.......................................................................         41         23          133
  Other.........................................................................        110          5           85
                                                                                  ---------  ---------       ------
    Total revenue...............................................................      1,110      1,196        4,552
                                                                                  ---------  ---------       ------
 
CERTAIN EXPENSES
  Property operating and maintenance............................................        330        302        1,498
  Property general and administrative...........................................         23         17          108
  Real estate taxes.............................................................         58        104          412
  Insurance.....................................................................         66         44          151
  Bad debts.....................................................................          0         37           18
  Other.........................................................................          0         16           41
                                                                                  ---------  ---------       ------
    Total certain expenses......................................................        477        520        2,228
                                                                                  ---------  ---------       ------
      Excess of revenue over certain expenses...................................  $     633  $     676    $   2,324
                                                                                  ---------  ---------       ------
                                                                                  ---------  ---------       ------
</TABLE>
 
 See accompanying notes to combined statements of revenue and certain expenses.
 
                                      F-38
<PAGE>
                             ACQUISITION PROPERTIES
 
          NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES
 
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
1.  ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
ORGANIZATION
 
    The accompanying combined statements of revenue and certain expenses include
the combined operations of two commercial office properties located in  Southern
California  (the "Acquisition  Properties") which  are to  be acquired  by Arden
Realty Group, Inc.,  a Maryland corporation  (the "Company"), concurrently  with
the consummation of a proposed initial public offering of its Common Stock.
 
    The Acquisition Properties are as follows:
 
<TABLE>
<CAPTION>
                                SOUTHERN        APPROXIMATE
                               CALIFORNIA         RENTABLE
      PROPERTY NAME             LOCATION       SQUARE FOOTAGE
- -------------------------  ------------------  --------------
<S>                        <C>                 <C>
303 Glenoaks Blvd.         Burbank                  171,943
12501 East Imperial        Norwalk                  122,172
                                                    -------
                                                    294,115
                                                    -------
                                                    -------
</TABLE>
 
BASIS OF PRESENTATION
 
    The  accompanying  statements were  prepared to  comply  with the  rules and
regulations of  the Securities  and  Exchange Commission  for inclusion  in  the
registration statement on Form S-11 of the Company.
 
    The accounts of the Acquisition Properties are combined in the statements of
revenues  and certain  expenses and  there are  no interproperty  accounts to be
eliminated. The accompanying  statements are  not representative  of the  actual
operations  for  the  periods presented  as  certain  expenses that  may  not be
comparable to the expenses expected to be incurred by the Company in the  future
operations  of the Acquisition Properties  have been excluded. Excluded expenses
consist of  interest, depreciation  and amortization  and property  general  and
administrative  costs not  directly comparable to  the future  operations of the
Acquisition Properties.
 
REVENUE RECOGNITION
 
    Rental revenue is recognized on a straight-line basis over the terms of  the
related leases.
 
RISKS AND UNCERTAINTIES
 
    The  preparation  of  financial  statements,  in  conformity  with generally
accepted accounting  principles,  requires  management  to  make  estimates  and
assumptions  that  affect the  reported amounts  of  assets and  liabilities and
disclosure of contingent  assets and liabilities  at the date  of the  financial
statements  and  the  reported  amounts  of  revenues  and  expenses  during the
reporting period. Actual results could differ from those estimates.
 
UNAUDITED INTERIM STATEMENT
 
    The combined statements of revenue and certain expenses for the three months
ended March 31, 1996 and 1995 are unaudited. In the opinion of management,  such
financial  statements reflect all adjustments  necessary for a fair presentation
of the results of the respective interim periods. All such adjustments are of  a
normal, recurring nature.
 
                                      F-39
<PAGE>
                             ACQUISITION PROPERTIES
 
  NOTES TO COMBINED STATEMENTS OF REVENUE AND CERTAIN EXPENSES -- (CONTINUED)
 
                      FOR THE YEAR ENDED DECEMBER 31, 1995
 
2.  COMMERCIAL OFFICE PROPERTY
    The  future minimum lease  payments to be  received under existing operating
leases as of December 31, 1995 are as follows:
 
<TABLE>
<S>                                               <C>
1996............................................  $5,310,000
1997............................................  5,185,000
1998............................................  4,175,000
1999............................................  2,789,000
2000............................................  1,770,000
Thereafter......................................  1,739,000
</TABLE>
 
    The above future minimum  lease payments do  not include specified  payments
for tenant reimbursements of operating expenses.
 
    Office  space in the  Acquisition Properties is  generally leased to tenants
under lease  terms  which  provide for  the  tenants  to pay  for  increases  in
operating expenses in excess of specified amounts.
 
                                      F-40
<PAGE>
      Map of California showing the locations of Arden Realty Group, Inc.
 properties in Los Angeles County (including a blow up of Los Angeles County),
                      Orange County and San Diego County.
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    No  dealer, salesman  or any  other person has  been authorized  to give any
information or to  make any  representations not contained  in this  Prospectus,
and,  if given or made,  such information or representations  must not be relied
upon as having been authorized by the  Company or any of the Underwriters.  This
Prospectus  does not constitute an  offer of any securities  other than those to
which it relates or an offer to sell,  or a solicitation of an offer to buy,  to
any  person in  any jurisdiction  where such an  offer or  solicitation would be
unlawful. Neither the delivery  of this Prospectus nor  any sale made  hereunder
shall,  under  any circumstances,  create any  implication that  the information
contained herein is correct as of any time subsequent to the date hereof.
 
                             ---------------------
 
                           SUMMARY TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                       Page
                                                        ---
<S>                                                  <C>
Prospectus Summary.................................          1
Risk Factors.......................................         18
The Company........................................         29
Business and Growth Strategies.....................         31
Use of Proceeds....................................         35
Distributions......................................         36
Capitalization.....................................         41
Dilution...........................................         42
Selected Combined Financial Information............         43
Management's Discussion and Analysis of Financial
  Condition and Results of Operations..............         45
Southern California Economy and Office Markets.....         53
Business and Properties............................         58
Management.........................................         84
Structure and Formation of the Company.............         89
Policies With Respect to Certain Transactions......         93
Certain Transactions...............................         96
Partnership Agreement..............................         97
Principal Stockholders.............................         99
Capital Stock......................................        100
Certain Provisions of Maryland law and the
  Company's Charter and Bylaws.....................        103
Shares Available for Future Sale...................        106
Federal Income Tax Considerations..................        107
ERISA Considerations...............................        118
Underwriting.......................................        121
Experts............................................        122
Legal Matters......................................        123
Additional Information.............................        123
Glossary...........................................        124
Index to Financial Statements......................        F-1
</TABLE>
 
                             ---------------------
 
    Until              , 1996 (25 days after  the date of this Prospectus),  all
dealers  effecting transactions in the securities offered hereby, whether or not
participating in this  distribution, may  be required to  deliver a  prospectus.
This  is in addition to  the obligation of dealers  to deliver a prospectus when
acting  as  underwriters  and  with  respect  to  their  unsold  allotments   or
subscriptions.
 
                               18,725,000 SHARES
 
                            ARDEN REALTY GROUP, INC.
 
                                  COMMON STOCK
 
                              -------------------
 
                                   PROSPECTUS
                                          , 1996
 
                             ---------------------
 
                                LEHMAN BROTHERS
 
                               ALEX. BROWN & SONS
                                  INCORPORATED
 
                           DEAN WITTER REYNOLDS INC.
 
                               SMITH BARNEY INC.
 
                            EVEREN SECURITIES, INC.
 
                                RAYMOND JAMES &
                                ASSOCIATES, INC.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                PART II. INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 30.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>
<S>                                                              <C>
Registration Fee - Securities and Exchange Commission..........  $148,504.00
NASD Fee.......................................................  $30,500.00
New York Stock Exchange Listing Fee............................      *
Transfer Agent and Registrar's Fees............................      *
Printing and Engraving Expenses................................      *
Legal Fees and Expenses (other than Blue Sky)..................      *
Accounting Fees and Expenses...................................      *
Blue Sky Fees and Expenses.....................................      *
Miscellaneous Expenses.........................................      *
                                                                 ----------
    Total......................................................  $   *
                                                                 ----------
                                                                 ----------
</TABLE>
 
- --------------
*  To be completed by Amendment.
 
ITEM 31.  SALES TO SPECIAL PARTIES.
 
    See Item 32.
 
ITEM 32.  RECENT SALES OF UNREGISTERED SECURITIES.
 
    As  part of the Formation Transactions an  aggregate of 2.7 million OP Units
will be issued  to certain Participants  in return for  (i) the contribution  of
certain  interests in the Arden Predecessors and in certain of the Properties to
the Operating Partnership and (ii) the  contribution by Arden of certain of  its
assets, including management contracts relating to certain of the Properties and
the  contract rights to purchase the Acquisition Properties. The issuance of the
OP Units will be effected in reliance upon an exemption from registration  under
Section 4(2) of the Securities Act as a transaction by an issuer not involving a
public   offering.  The  descriptions  of  the  foregoing  transactions  in  the
Prospectus  under  the  headings  "Formation  Transactions,"  "Management"   and
"Certain Transactions" are incorporated herein by reference.
 
ITEM 33.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    The  MGCL  permits  a  Maryland  corporation to  include  in  its  charter a
provision  limiting  the  liability  of  its  directors  and  officers  to   the
corporation  and  its  stockholders  for  money  damages  except  for  liability
resulting from (a)  actual receipt of  an improper benefit  or profit in  money,
property  or services or  (b) active and deliberate  dishonesty established by a
final judgment as  being material to  the cause  of action. The  Charter of  the
Company contains such a provision which eliminates such liability to the maximum
extent permitted by Maryland law.
 
    The Charter of the Company authorizes it, to the maximum extent permitted by
Maryland law, to obligate itself to indemnify and to pay or reimburse reasonable
expenses  in advance of final disposition of  a proceeding to (a) any present or
former director or officer or  (b) any individual who,  while a director of  the
Company  and  at  the request  of  the  Company, serves  or  has  served another
corporation, partnership, joint venture, trust,  employee benefit plan or  other
enterprise  from and  against any  claim or liability  to which  such person may
incur by reason of his  status as a present  or former stockholder, director  or
officer  of the Company. The  Bylaws of the Company  obligate it, to the maximum
extent permitted  by  Maryland  law,  to  indemnify  and  to  pay  or  reimburse
reasonable  expenses in advance of final disposition  of a proceeding to (a) any
present or former director of officer who  is made a party to the proceeding  by
reason  of  his service  in that  capacity or  (b) any  individual who,  while a
director of the Company and at the request of the Company, serves or has  served
another corporation, partnership, joint venture, trust, employee benefit plan or
any  other  enterprise  as  a  director, officer,  partner  or  trustee  of such
corporation, partnership, joint venture, trust,  employee benefit plan or  other
enterprise and who is made a party to the proceeding by reason of his service in
that  capacity against any claim or liability  to which he may become subject by
reason of such
 
                                      II-1
<PAGE>
service. The Charter and Bylaws also permit the Company to indemnify and advance
expenses to any person  who served a  predecessor of the Company  in any of  the
capacities  described above  and to any  employee or  agent of the  Company or a
predecessor of the Company.
 
    The MGCL  requires a  corporation (unless  its charter  provides  otherwise,
which the Company's Charter does not) to indemnify a director or officer who has
been successful, on the merits or otherwise, in the defense of any proceeding to
which  he is made a party  by reason of his services  in that capacity. The MGCL
permits a  corporation  to  indemnify  its  present  and  former  directors  and
officers,  among others,  against judgments,  penalties, fines,  settlements and
reasonable expenses actually incurred by them in connection with any  proceeding
to  which they may be made a party by  reason of their service in those or other
capacities unless it is established that (a) the act or omission of the director
or officer was material to the matter giving rise to the proceeding and (i)  was
committed  in  bad  faith  or  (ii) was  the  result  of  active  and deliberate
dishonesty, (b) the director or  officer actually received an improper  personal
benefit  in  money, property  or services  or (c)  in the  case of  any criminal
proceeding, the director or officer had reasonable cause to believe that the act
or omission was unlawful. However, a Maryland corporation may not indemnify  for
an  adverse  judgment in  a  suit by  or  in the  right  of the  corporation. In
addition, the MGCL requires the Company,  as a condition to advancing  expenses,
to obtain (a) a written affirmation by the director or officer of his good faith
belief  that he has met the standard of conduct necessary for indemnification by
the Company as authorized by the Bylaws and (b) a written statement by or on his
behalf to  repay the  amount  paid or  reimbursed by  the  Company if  it  shall
ultimately be determined that the standard of conduct was not met.
 
ITEM 34.  TREATMENT OF PROCEEDS FROM STOCK BEING REGISTERED.
 
    Not applicable.
 
ITEM 35.  FINANCIAL STATEMENTS AND EXHIBITS.
 
    (a) Financial Statements.
 
    ARDEN REALTY GROUP, INC.
 
    Pro Forma Condensed Combined Financial Statements (Unaudited)
 
       Pro  Forma Condensed Combined  Balance Sheet as  of March 31, 1996
       (Unaudited)
 
       Pro Forma Condensed Combined Statement of Operations for the Three
       Months Ended March 31, 1996 (Unaudited)
 
       Pro Forma Condensed Combined Statement of Operations for the  Year
       Ended December 31, 1995 (Unaudited)
 
       Notes   to  Pro  Forma  Condensed  Combined  Financial  Statements
       (Unaudited)
 
    Historical:
 
       Report of Independent Auditors
 
       Balance Sheet as of May 1, 1996
 
       Notes to Balance Sheet
 
    ARDEN PREDECESSORS
 
    Combined Financial Statements:
 
       Report of Independent Auditors
 
       Combined Balance Sheets as of March 31, 1996 (Unaudited), December
       31, 1995 and 1994
 
       Combined Statements of Operations for the Three Months ended March
       31, 1996 and 1995 (Unaudited)  the Years Ended December 31,  1995,
       1994 and 1993
 
                                      II-2
<PAGE>
       Combined  Statements of Owners' Equity  for the Three Months ended
       March 31, 1996 (Unaudited) and  the Years Ended December  31,1995,
       1994 and 1993
 
       Combined Statements of Cash Flows for the Three Months ended March
       31,  1996 and  1995 (Unaudited) and  the Years  Ended December 31,
       1995, 1994 and 1993
 
       Notes to Combined Financial Statements
 
       Schedule III  --  Commercial  Office  Properties  and  Accumulated
       Depreciation
 
    1995 ACQUIRED PROPERTIES
 
    Combined Statements of Revenue and Certain Expenses:
 
       Report of Independent Auditors
 
       Combined  Statements of Revenue and Certain Expenses for the Three
       Months ended  March  31,  1996 and  1995  (Unaudited)  Year  Ended
       December 31, 1995
 
       Notes to Combined Statements of Revenue and Certain Expenses
 
    1996 ACQUIRED PROPERTIES
 
    Combined Statements of Revenue and Certain Expenses:
 
       Report of Independent Auditors
 
       Combined  Statements of Revenue and Certain Expenses for the Three
       Months Ended March 31, 1996 and 1995 (Unaudited) and the Year  End
       December 31, 1995
 
       Notes to Combined Statements of Revenue and Certain Expenses
 
    ACQUISITION PROPERTIES
 
    Combined Statements of Revenue and Certain Expenses:
 
       Report of Independent Auditors
 
       Combined  Statements of Revenue and Certain Expenses for the Three
       Months Ended  March 31,  1996 and  1995 (Unaudited)  and the  Year
       Ended December 31, 1995
 
       Notes to Combined Statements of Revenue and Certain Expenses
 
    (b)  Schedules Included in Part II: None.
 
    All other schedules have been omitted because they are either not applicable
or  the information required has been  disclosed in the financial statements and
related notes included in this Prospectus.
 
    (c) Exhibits.
 
<TABLE>
<C>        <S>
     1.1*  Form of Underwriting Agreement between the Company and the Representatives.
     3.1*  Restated Charter of the Company.
     3.2*  Bylaws of the Company.
     3.3*  Specimen of certificate representing shares of Common Stock.
     5.1*  Opinion of Latham & Watkins regarding the validity of the securities being
            registered.
     8.1*  Opinion of Latham & Watkins regarding tax matters.
    10.1*  Agreement of Limited Partnership of the Operating Partnership.
    10.2*  1996 Stock Option and Incentive Plan.
    10.3*  Form of Officers and Directors Indemnification Agreement.
    10.4*  Credit Facility Agreement.
    10.5*  Mortgage Financing Agreement.
    10.6*  Employment Agreement between the Company and Mr. Ziman.
    10.7*  Employment Agreement between the Company and Mr. Coleman.
</TABLE>
 
                                      II-3
<PAGE>
<TABLE>
<C>        <S>
    10.8*  Registration Rights Agreement between the Company and the Participants.
    10.9*  Ground lease for Imperial Bank Tower.
   10.10*  Ground lease for 5000 East Spring Street.
   10.11*  Ground lease for 4811 Airport Plaza Drive.
   10.12*  Ground lease for 4900/10 Airport Plaza Drive.
   10.13*  Ground lease for parking structure at the Anaheim City Centre.
   10.14*  Contribution Agreement with Richard S. Ziman.
   10.15*  Contribution Agreement with Victor J. Coleman.
   10.16*  Contribution Agreement with Arden Realty Group, Inc.
    21.1   Subsidiary of the Registrant.
    23.1   Consent of Ernst & Young LLP.
    23.2   Consent of Cushman & Wakefield of California, Inc.
    23.3*  Consent of Latham & Watkins (contained in Exhibits 5.1 and 8.1).
    23.4   Consent of Carl D. Covitz.
    23.5   Consent of Kenneth B. Roath.
    23.6   Consent of Arthur Gilbert.
    23.7   Consent of Steven C. Good
    24.    Power of Attorney (see Page II-5).
    27.    Financial Data Schedule.
</TABLE>
 
- --------------
*  To be filed by amendment.
 
ITEM 36.  UNDERTAKINGS.
 
    The undersigned Company hereby undertakes to provide to the Underwriters  at
the  closing  specified  in  the Underwriting  Agreement,  certificates  in such
denominations and registered in  such names as required  by the Underwriters  to
permit prompt delivery to each purchaser.
 
    Insofar  as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers  and controlling persons of the  Company
pursuant  to the  provisions described  under Item  33 above,  or otherwise, the
Company  has  been  advised  that  in   the  opinion  of  the  Commission   such
indemnification  is against public policy as expressed in the Securities Act and
is, therefore,  unenforceable. In  the event  that a  claim for  indemnification
against  such liabilities  (other than  the payment  by the  Company of expenses
incurred or paid by a Director, officer or controlling person of the Company  in
the  successful defense of any  action, suit or proceeding)  is asserted by such
Director, Officer or controlling person in connection with the securities  being
registered,  the Company will, unless  in the opinion of  its counsel the matter
has been settled  by controlling  precedent, submit  to a  court of  appropriate
jurisdiction  the question whether such indemnification  by it is against public
policy as expressed  in the Securities  Act and  will be governed  by the  final
adjudication of such issue. The undersigned Company hereby undertakes that:
 
    (1)  For the purposes of determining any liability under the Securities Act,
the  information  omitted from  the  form of  Prospectus  filed as  part  of the
Registration Statement in reliance upon Rule  430A and contained in the form  of
Prospectus  filed by  the Company  pursuant to Rule  424(b)(1) or  (4) or 497(h)
under the  Securities  Act  shall be  deemed  to  be part  of  the  Registration
Statement as of the time it was declared effective.
 
    (2)   For the purpose of determining any liability under the Securities Act,
each post-effective amendment that contains a form of prospectus shall be deemed
to be a new registration statement  relating to the securities offered  therein,
and  the offering  of such  securities at that  time shall  be deemed  to be the
initial bona fide offering thereof.
 
                                      II-4
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act, the Registrant certifies
that  it has reasonable grounds to believe that it meets all of the requirements
for filing on Form S-11  and has duly caused  this Registration Statement to  be
signed  on its behalf by the undersigned, thereunto duly authorized, in the City
of Los Angeles, State of California on the sixteenth day of July, 1996.
 
                                          ARDEN REALTY GROUP, INC.
 
                                          By:        /s/ RICHARD S. ZIMAN
 
                                             -----------------------------------
                                                      Richard S. Ziman
                                             CHAIRMAN OF THE BOARD OF DIRECTORS
                                                 AND CHIEF EXECUTIVE OFFICER
 
    KNOW ALL MEN  BY THESE PRESENTS,  that each person  whose signature  appears
below  hereby constitutes and appoints Richard S.  Ziman or Victor J. Coleman or
any one of them, his or her  attorneys-in-fact and agents, each with full  power
of  substitution and resubstitution for him or her in any and all capacities, to
sign any or  all amendments  or post-effective amendments  to this  Registration
Statement  or a Registration  Statement prepared in accordance  with Rule 462 of
the Securities  Act, and  to file  the  same, with  exhibits thereto  and  other
documents  in connection herewith or in  connection with the registration of the
Common Stock under  the Securities Exchange  Act of 1934,  as amended, with  the
Securities and Exchange Commission, granting unto each of such attorneys-in-fact
and  agents full power  and authority to do  and perform each  and every act and
thing requisite  and  necessary  in  connection with  such  matters  and  hereby
ratifying  and confirming all that each  of such attorneys-in-fact and agents or
his or her substitutes may do or cause to be done by virtue hereof.
 
    Pursuant to  the  requirements  of the  Securities  Act,  this  Registration
Statement  has  been signed  below by  the following  persons in  the capacities
indicated on July 16, 1996.
 
                                               TITLE
                                     -------------------------
 
                                     Chairman of the Board of
       /s/ RICHARD S. ZIMAN           Directors and
- -----------------------------------   Chief Executive Officer
         Richard S. Ziman             (Principal Executive
                                      Officer)
 
       /s/ VICTOR J. COLEMAN         President, Chief
- -----------------------------------   Operating Officer and
         Victor J. Coleman            Director
 
                                     Chief Accounting Officer
         /s/ MICHELE BYER             and Secretary
- -----------------------------------   (Principal Financial and
           Michele Byer               Accounting Officer)
 
                                      II-5
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT                                                                                                 SEQUENTIALLY
   NO.                                             EXHIBIT                                               NUMBERED PAGE
- ---------  ----------------------------------------------------------------------------------------  ---------------------
<S>        <C>                                                                                       <C>
1.1*       Form of Underwriting Agreement between the Company and the Representatives.
3.1*       Restated Charter of the Company.
3.2*       Bylaws of the Company.
3.3*       Specimen of certificate representing shares of Common Stock.
5.1*       Opinion of Latham & Watkins regarding the validity of the securities being registered.
8.1*       Opinion of Latham & Watkins regarding tax matters.
10.1*      Agreement of Limited Partnership of the Operating Partnership.
10.2*      1996 Stock Option and Incentive Plan.
10.3*      Form of Officers and Directors Indemnification Agreement.
10.4*      Credit Facility Agreement.
10.5*      Mortgage Financing Agreement.
10.6*      Employment Agreements between the Company and Mr. Ziman.
10.7*      Employment Agreement between the Company and Mr. Coleman.
10.8*      Registration Rights Agreement between the Company and the Participants.
10.9*      Ground lease for Imperial Bank Tower.
10.10*     Ground lease for 5000 East Spring Street.
10.11*     Ground lease for 4811 Airport Plaza Drive.
10.12*     Ground lease for 4900/10 Airport Plaza Drive.
10.13*     Ground lease for parking structure at the Anaheim City Centre.
10.14*     Contribution Agreement with Richard S. Ziman.
10.15*     Contribution Agreement with Victor J. Coleman.
10.16*     Contribution Agreement with Arden Realty Group, Inc.
21.1       Subsidiary of the Registrant.
23.1       Consent of Ernst & Young LLP.
23.2       Consent of Cushman & Wakefield of California, Inc.
23.3*      Consent of Latham & Watkins (contained in Exhibits 5.1 and 8.1).
23.4       Consent of Carl D. Covitz.
23.5       Consent of Kenneth B. Roath.
23.6       Consent of Arthur Gilbert.
23.7       Consent of Steven C. Good.
24.        Power of Attorney (see Page II-5).
27.        Financial Data Schedule.
</TABLE>
 
- --------------
* To be filed by amendment.

<PAGE>
                                                                      EXHIBIT 21
 
                          SUBSIDIARY OF THE REGISTRANT
 
    Arden Realty Group Limited Partnership, a Maryland limited partnership

<PAGE>
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
    We  consent to the reference of our  firm under the caption "Experts" and to
the use  of our  reports on  the Arden  Predecessors (as  defined in  the  Notes
thereto), the 1995 Acquired Properties (as defined in the Notes thereto) and the
1996 Acquired Properties (as defined in the Notes thereto) dated April 10, 1996,
the  Acquisition Properties  (as defined in  the Notes thereto)  dated April 19,
1996 and Arden Realty Group, Inc., a Maryland Corporation, dated May 1, 1996, in
the Registration Statement filed by Arden Realty Group, Inc. on Form S-11  dated
July 16, 1996 and the related Prospectus.
 
                                               /s/ ERNST & YOUNG LLP
  ------------------------------------------------------------------------------
 
Los Angeles, California
July 15, 1996

<PAGE>
                                                                    EXHIBIT 23.2
 
               CONSENT OF CUSHMAN & WAKEFIELD OF CALIFORNIA, INC.
 
    We  hereby consent  to the use  of our name  and the references  to the "C&W
Market Study" wherever appearing in  this Registration Statement filed by  Arden
Realty  Group, Inc. on Form  S-11 and the related  Prospectus and any amendments
thereto, including but not  limited to the references  to our company under  the
headings "C&W Market Study" and "Experts" in the Prospectus.
 
Dated: July 16, 1996
 
                                          Cushman & Wakefield of California,
                                          Inc.
 
                                          By:         /s/ JAMES W. MYERS
 
                                             -----------------------------------
                                                    Name: James W. Myers
                                                   Title: SENIOR DIRECTOR

<PAGE>
                                                                    EXHIBIT 23.4
 
                           CONSENT OF CARL D. COVITZ
 
    I  hereby consent to being named a  proposed director of Arden Realty Group,
Inc. and to the use of my name under the heading "MANAGEMENT" in the  Prospectus
which  is part of this Registration Statement  filed by Arden Realty Group, Inc.
on Form S-11, and to the use of my name wherever appearing in this  Registration
Statement and the related Prospectus, and any amendments thereto.
 
Dated: July 16, 1996
 
                                          By:         /s/ CARL D. COVITZ
 
                                             -----------------------------------
                                                       Carl D. Covitz

<PAGE>
                                                                    EXHIBIT 23.5
 
                          CONSENT OF KENNETH B. ROATH
 
    I  hereby consent to being named a  proposed director of Arden Realty Group,
Inc. and to the use of my name under the heading "MANAGEMENT" in the  Prospectus
which  is part of this Registration Statement  filed by Arden Realty Group, Inc.
on Form S-11, and to the use of my name wherever appearing in this  Registration
Statement and the related Prospectus, and any amendments thereto.
 
Dated: July 16, 1996
 
                                                   /s/ KENNETH B. ROATH
 
                                          --------------------------------------
                                                     Kenneth B. Roath

<PAGE>
                                                                    EXHIBIT 23.6
 
                           CONSENT OF ARTHUR GILBERT
 
    I  hereby consent to being named a  proposed director of Arden Realty Group,
Inc. and to the use of my name under the heading "MANAGEMENT" in the  Prospectus
which  is part of this Registration Statement  filed by Arden Realty Group, Inc.
on Form S-11, and to the use of my name wherever appearing in this  Registration
Statement and the related Prospectus, and any amendments thereto.
 
Dated: July 16, 1996
 
                                                    /s/ ARTHUR GILBERT
 
                                          --------------------------------------
                                                      Arthur Gilbert

<PAGE>
                                                                    EXHIBIT 23.7
 
                           CONSENT OF STEVEN C. GOOD
 
    I  hereby consent to being named a  proposed director or Arden Realty Group,
Inc. and to the use of my name under the heading "MANAGEMENT" in the  Prospectus
which  is part of this Registration Statement  filed by Arden Realty Group, Inc.
on Form S-11, and to the use of my name wherever appearing in this  Registration
Statement and the related Prospectus, and any amendments thereto.
 
Dated: July 16, 1996
 
                                                    /s/ STEVEN C. GOOD
 
                                          --------------------------------------
                                                      Steven C. Good

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995
<PERIOD-END>                               MAR-31-1996             DEC-31-1995
<CASH>                                           24554                   16702
<SECURITIES>                                         0                       0
<RECEIVABLES>                                     5766                    4709
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                 30320                   21411
<PP&E>                                          354587                  258733
<DEPRECIATION>                                  (8954)                  (6651)
<TOTAL-ASSETS>                                  380290                  277643
<CURRENT-LIABILITIES>                             7963                    7903
<BONDS>                                         353394                  253996
                                0                       0
                                          0                       0
<COMMON>                                             0                       0
<OTHER-SE>                                           0                       0
<TOTAL-LIABILITY-AND-EQUITY>                    380290                  277643
<SALES>                                              0                       0
<TOTAL-REVENUES>                                 15054                   78582
<CGS>                                                0                       0
<TOTAL-COSTS>                                     5675                   11644
<OTHER-EXPENSES>                                  2396                    4373
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                8832                   13780
<INCOME-PRETAX>                                 (1849)                  (1215)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                             (1849)                  (1215)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    (1849)                  (1215)
<EPS-PRIMARY>                                        0                       0
<EPS-DILUTED>                                        0                       0
        

</TABLE>


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