ABOVENET COMMUNICATIONS INC
S-1, 1999-04-07
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 7, 1999.
 
                                            REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                          ABOVENET COMMUNICATIONS INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN OUR CHARTER)
 
<TABLE>
<S>                              <C>                              <C>
            DELAWARE                           4813                          77-0424796
(STATE OR OTHER JURISDICTION OF    (PRIMARY STANDARD INDUSTRIAL           (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)    CLASSIFICATION CODE NUMBER)         IDENTIFICATION NUMBER)
</TABLE>
 
                     50 W. SAN FERNANDO STREET, SUITE #1010
                           SAN JOSE, CALIFORNIA 95113
                                 (408) 367-6666
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                                  SHERMAN TUAN
                            CHIEF EXECUTIVE OFFICER
                     50 W. SAN FERNANDO STREET, SUITE #1010
                           SAN JOSE, CALIFORNIA 95113
                                 (408) 367-6666
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                                   COPIES TO:
 
<TABLE>
<S>                                              <C>
             CARLA S. NEWELL, ESQ.                            JORGE DEL CALVO, ESQ.
              BENNETT L. YEE, ESQ.                            STANTON D. WONG, ESQ.
             ALLISON M. WING, ESQ.                         GABRIELLA A. LOMBARDI, ESQ.
              TODD W. SMITH. ESQ.                          CHRISTINE F. NAKAGAWA, ESQ.
            GUNDERSON DETTMER STOUGH                      PILLSBURY MADISON & SUTRO LLP
      VILLENEUVE FRANKLIN & HACHIGIAN, LLP                     2550 HANOVER STREET
             155 CONSTITUTION DRIVE                            PALO ALTO, CA 94304
              MENLO PARK, CA 94025                                (650) 233-4500
                 (650) 321-2400
</TABLE>
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
 
If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, check the following box.  [ ]
 
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>
<S>                        <C>                     <C>                     <C>                     <C>
- -------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------
      TITLE OF EACH                                   PROPOSED MAXIMUM        PROPOSED MAXIMUM
CLASS OF SECURITIES TO BE       AMOUNT TO BE         OFFERING PRICE PER      AGGREGATE OFFERING          AMOUNT OF
       REGISTERED              REGISTERED(1)              SHARE(2)                PRICE(2)          REGISTRATION FEE(2)
- -------------------------------------------------------------------------------------------------------------------------
Common stock, $0.001 par
  value..................     4,600,000 shares            $123.00               $565,800,000            $157,295.00
- -------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Includes 600,000 shares of common stock that the Underwriters have the
    option to purchase to cover over-allotments, if any.
 
(2) Estimated solely for the purpose of calculating the amount of the
    registration fee pursuant to Rule 457(c) under the Securities Act, based on
    the average of the high and low prices for the common stock on the Nasdaq
    National Market on April 6, 1999.
 
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 THAT SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SUCH SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                   SUBJECT TO COMPLETION, DATED APRIL 7, 1999
 
THE INFORMATION CONTAINED IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
THESE SECURITIES MAY NOT BE SOLD UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED.
 
                                4,000,000 SHARES
                                      LOGO
                          ABOVENET COMMUNICATIONS INC.
 
                                  COMMON STOCK
                              $          PER SHARE
 
- --------------------------------------------------------------------------------
 
AboveNet Communications Inc. is offering 2,700,000 shares and the selling
stockholders identified in this prospectus are offering 1,300,000 shares with
this prospectus. AboveNet will not receive any proceeds from the sale of shares
by the selling stockholders. This is a firm commitment underwriting.
 
The common stock is listed on the Nasdaq National Market under the symbol
"ABOV." On April 6, 1999, the last reported sale price of the common stock on
the Nasdaq National Market was $123.00 per share.
 
INVESTING IN THE COMMON STOCK INVOLVES CERTAIN RISKS. SEE "RISK FACTORS"
BEGINNING ON PAGE 7.
 
<TABLE>
<CAPTION>
                                                PER SHARE      TOTAL
                                                ---------    ----------
<S>                                             <C>          <C>
Price to the public...........................   $           $
Underwriting discount.........................
Proceeds to AboveNet..........................
Proceeds to the selling stockholders..........
</TABLE>
 
AboveNet has granted an over-allotment option to the underwriters. Under this
option, the underwriters may elect to purchase a maximum of 600,000 additional
shares from AboveNet within 30 days following the date of this prospectus to
cover over-allotments.
- --------------------------------------------------------------------------------
 
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
CIBC WORLD MARKETS
           LEHMAN BROTHERS
                        PAINEWEBBER INCORPORATED
                                   VOLPE BROWN WHELAN & COMPANY
 
               The date of this Prospectus is             , 1999
<PAGE>   3
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                PAGE
                                                              ---------
<S>                                                           <C>
Prospectus Summary..........................................       4
Risk Factors................................................       7
Special Note Regarding Forward-Looking Statements...........      19
Use of Proceeds.............................................      20
Dividend Policy.............................................      20
Price Range of Common Stock.................................      20
Capitalization..............................................      21
Dilution....................................................      22
Selected Financial and Operating Data.......................      23
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................      24
Business....................................................      35
Management..................................................      51
Certain Transactions........................................      64
Principal and Selling Stockholders..........................      66
Description of Capital Stock................................      69
Shares Eligible for Future Sale.............................      72
Underwriting................................................      74
Legal Matters...............................................      76
Experts.....................................................      76
Change in Accountants.......................................      76
Additional Information......................................      76
Index to Financial Statements...............................     F-1
</TABLE>
 
                      ------------------------------------
 
As used in this prospectus, the terms "we," "us," "our" and AboveNet mean
AboveNet Communications Inc. and the term "common stock" means our common stock,
$0.001 per share.
 
Our principal executive offices are located at 50 W. San Fernando Street, Suite
#1010, San Jose, California 95113. Our telephone number is (408) 367-6666.
 
Unless otherwise stated herein, all information contained in this prospectus
assumes no exercise of the overallotment option granted to the underwriters.
 
On March 29, 1999, we announced a 2 for 1 stock split of our common stock. The
stock split will be effected through the issuance of a stock dividend and will
entitle each stockholder of record on April 14, 1999, to receive one share for
every outstanding share of common stock held by them on that date. The dividend
is expected to be distributed to stockholders on May 7, 1999. All common share
numbers in this prospectus do not reflect the stock split.
 
The underwriters are offering the shares subject to various conditions and may
reject all or part of any order. The shares should be ready for delivery on or
about           ,1999 against payment in immediately available funds.
 
EtherValve is our registered trademark. Cabriolet and MRTG are our trademarks.
We have applied for federal trademark registration for the following names:
AboveNet APS, ASAP, As-Ur-Here and Internet Service Exchange. All other
trademarks, servicemarks or tradenames referred to in this prospectus are the
property of their respective owners.
 
                                        3
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
The summary highlights information contained in other parts of this prospectus,
including "Risk Factors." It is not complete and may not contain all of the
information that you should consider before investing in the shares. You should
read the entire prospectus carefully.
 
                                  OUR COMPANY
 
AboveNet is a leading provider of facilities-based, managed services for
customer-owned Web servers and related equipment, known as co-location, and high
performance Internet connectivity solutions for electronic commerce and other
business critical Internet operations. We have developed a network architecture
based upon strategically located facilities. These facilities, known as Internet
service exchanges, allow Internet content providers direct access to Internet
service providers. We are establishing two campuses, one located on the West
Coast and one located on the East Coast. Our West Coast campus is comprised of
our two San Jose, California Internet service exchange facilities, one of which
is under development. Our East Coast campus is comprised of our existing Vienna,
Virginia Internet service exchange facility and our planned facilities in New
York, New York and the Washington D.C. area. On March 31, 1999, we had 257
public and private data exchange connections, known as peering arrangements,
including relationships with most major network providers. Our network
architecture and extensive peering relationships are designed to reduce the
number of network connections or "hops" for data traveling across the Internet.
By having both Internet content providers and Internet service providers
co-located at our Internet service exchanges we enable our Internet service
provider customers to offer their users "one hop" connectivity, through our
local area network, to the sites of the Internet content providers that are
co-located at our facilities. As of March 31, 1999, we had 458 customers,
including Internet content providers, Web hosting companies and Internet service
providers.
 
The Internet has experienced tremendous growth and is emerging as a global
medium for communications and commerce. Internet-based businesses and other
enterprises need non-stop, high performance Internet operations that can handle
the growth in their businesses and allow them to communicate and transact
business globally over the Internet. However, many businesses that are seeking
to establish these operations lack the resources and expertise to
cost-effectively develop, maintain and enhance the necessary facilities and
network systems. As a result, many businesses are seeking to outsource these
functions to third party service providers to enhance their Web site reliability
and performance, provide continuous operation of their Internet solutions,
reduce related operating expenses and focus on their core businesses.
 
We design our solutions to be very flexible and to allow our customers to easily
expand their use of our services as their Internet operations grow. We charge
our customers based on how much space and bandwidth they use. This provides our
customers with a flexible, cost-effective method to increase their Internet
operations.
 
We design our services to enhance performance through a high speed network and
we provide our customers with monitoring, notification and diagnostic services
twenty-four hours a day, seven days a week. Our internally developed software
monitors all of our direct and indirect network connections for delays in
delivery of data packets and loss of data packets. This monitoring software
allows our network engineers to enhance performance by rerouting data traffic as
problems occur to avoid congested points. We also provide our customers with
sophisticated monitoring, reporting and management tools that can be accessed by
customers remotely from their own facilities to control their Internet
operations. By providing a means to reduce the number of "hops" in the
transmission of data, we believe that our network design can provide significant
benefits to Internet service providers and their users as they seek to gain
fast, reliable access to the sites of Internet content providers.
 
                                        4
<PAGE>   5
 
Our objective is to become the leading global provider of co-location and high
performance Internet connectivity for Internet content providers, Web hosting
companies and Internet service providers that require high-bandwidth, business
critical Internet operations. To achieve this objective, we intend to do the
following:
 
  - Increase awareness of the AboveNet name on a global basis.
 
  - Expand our customer base through increased sales and marketing efforts and
    establish relationships with channel partners.
 
  - Expand our global Internet service exchange network by connecting
    centralized facilities in key domestic and international locations. As part
    of this strategy, in March 1999, we entered into strategic agreements to
    establish regional Internet service exchanges in Austria, Germany and the
    United Kingdom.
 
  - Leverage our Internet service exchange model to increase our customer base
    and to generate additional recurring monthly revenues.
 
  - Address the emerging requirements of Internet technologies such as audio and
    video streaming and voice over the Internet.
 
Our customers include AT&T Solutions, CNET Download.com, e-Media, LLC, Got.Net,
IntelliChoice, Inc., iXL, Inc., KDD America, Netscape Communications Corporation
(acquired by America Online, Inc.), RealNetworks, Inc., RemarQ Communities, Inc.
(formerly named Supernews, Inc.), WebMD, Inc. and The Web Zone, Inc. Our
customer base increased from 221 at March 31, 1998, to 278 at June 30, 1998, to
316 at September 30, 1998, to 382 at December 31, 1998 to 458 at March 31, 1999.
 
                                  THE OFFERING
 
Common stock offered by AboveNet........     2,700,000 shares
 
Common stock offered by the selling
stockholders............................     1,300,000 shares
 
Common stock to be outstanding after the
offering................................     16,322,599 shares
 
Use of proceeds.........................     For capital expenditures related to
                                             the build out of ISX facilities and
                                             increasing network capacity,
                                             potential strategic investments,
                                             working capital and general
                                             corporate purposes. See "Use of
                                             Proceeds."
 
Nasdaq National Market symbol...........     ABOV
- -------------------------
The number of shares outstanding is based on shares outstanding as of December
31, 1998 and, excludes:
 
 - 1,897,124 shares of common stock issuable upon exercise of options
   outstanding under our 1996 and 1997 Stock Option Plans and non-plan options
   at a weighted average exercise price of $4.50 per share and 1,555,127 shares
   of common stock reserved for issuance under our 1998 Stock Incentive Plan.
   From December 31, 1998 through March 31, 1999, we issued options to purchase
   237,150 shares of common stock;
 
 - 172,658 shares of common stock issuable upon exercise of outstanding warrants
   at a weighted average exercise price of $8.76 per share; and
 
 - 156,250 shares of common stock reserved for issuance under our 1998 Employee
   Stock Purchase Plan.
 
                                        5
<PAGE>   6
 
                       SUMMARY FINANCIAL AND OPERATING DATA
                (In thousands, except per share and customer data)
 
<TABLE>
<CAPTION>
                                     PERIOD FROM                           SIX MONTHS ENDED
                                    MARCH 8, 1996    YEAR ENDED JUNE 30,     DECEMBER 31,
                                    (INCEPTION) TO   -------------------   -----------------
                                    JUNE 30, 1996      1997       1998      1997      1998
                                    --------------   --------   --------   -------   -------
<S>                                 <C>              <C>        <C>        <C>       <C>
STATEMENT OF OPERATIONS DATA:
Revenues..........................      $   79       $   552    $ 3,436    $ 1,105   $ 4,446
Loss from operations..............         (78)       (1,804)    (5,327)    (1,150)   (8,333)
Net loss..........................      $  (78)      $(1,803)   $(5,425)   $(1,266)  $(8,543)
                                        ======       =======    =======    =======   =======
Basic and diluted loss per
  share...........................      $(0.62)      $ (9.17)   $(20.68)   $ (5.91)  $ (4.50)
                                        ======       =======    =======    =======   =======
Shares used in basic and diluted
  loss per share..................         125           197        262        214     1,897
 
OTHER OPERATING DATA:
Capital expenditures..............      $  101       $   850    $ 4,145    $   298   $20,075
Number of customers at period
  end.............................          10           110        278        178       382
</TABLE>
 
<TABLE>
<CAPTION>
                                                                DECEMBER 31, 1998
                                                              ----------------------
                                                              ACTUAL     AS ADJUSTED
                                                              -------    -----------
<S>                                                           <C>        <C>
BALANCE SHEET DATA:
Cash and equivalents........................................  $67,904     $380,939
Working capital.............................................   58,724      371,759
Total assets................................................   95,732      408,767
Long-term obligations, net of current portion...............    6,500        6,500
Total stockholders' equity..................................   76,869      389,904
</TABLE>
 
     The "as adjusted" numbers in the table above give effect to our receipt of
     the net proceeds from the sale of 2,700,000 shares of common stock by us at
     an assumed public offering price of $123.00 per share, after deducting the
     estimated underwriting discount and estimated offering expenses payable by
     us. Capital expenditures in the table above represent purchases of property
     and equipment, including non-cash transactions such as the acquisition of
     equipment under capital leases. See Notes 1 and 7 of Notes to Financial
     Statements for an explanation of the method used to determine the number of
     shares used to compute basic and diluted loss per share.
 
                                        6
<PAGE>   7
 
                                  RISK FACTORS
 
You should carefully consider the following factors and other information in
this prospectus before deciding to invest in the shares. The risks and
uncertainties described below may not be the only ones we face. If any of the
following risks actually occur, our business, financial condition or results of
operations could be materially and adversely affected. In this event, the
trading price of our common stock could decline, and you may lose all or part of
your investment. Please see the "Special Note Regarding Forward-Looking
Statements" on page 18 of this prospectus.
 
BECAUSE WE HAVE A LIMITED OPERATING HISTORY, OUR BUSINESS IS DIFFICULT TO
EVALUATE
 
We were incorporated in March 1996 and began offering our co-location and
Internet connectivity services to content providers through our first facility
in July 1996. We introduced our co-location and Internet connectivity services
to Internet service providers in August 1997 and began operating our second
Internet service exchange facility in Vienna, Virginia, in July 1998.
Accordingly, we have a limited operating history, and we face all of the risks
and uncertainties encountered by early-stage companies. Also, because we have a
limited operating history, our past results may not be meaningful and you should
not rely on them as indicators of our future performance. In addition, our
prospects must be considered in light of the risks, expenses and difficulties
associated with the new and rapidly evolving market for co-location and Internet
connectivity services. In sum, because of our limited history and the youth and
inherent risks of our industry, predictions of our future performance are very
difficult.
 
WE HAVE INCURRED SUBSTANTIAL LOSSES AND ANTICIPATE CONTINUING AND INCREASING
LOSSES
 
Since our inception we have incurred substantial losses. We expect our losses to
significantly increase as we make further investments. We experienced net losses
of $1.8 million, $5.4 million and $8.5 million in fiscal years 1997 and 1998,
and for the six months ended December 31, 1998. As of December 31, 1998, we had
an accumulated deficit of $15.8 million. Our losses are expected to increase as
we intend to:
 
  - substantially increase our sales and marketing activities;
 
  - establish additional Internet service exchange facilities in San Jose,
    California, New York, New York, and the Washington D.C. area;
 
  - purchase additional rights to use capacity on fiber optic cable systems;
 
  - establish joint ventures with foreign entities developing international
    Internet service exchanges; and
 
  - expand our global network through purchases of long-term capacity and
    related equipment.
 
We face significant challenges before we can become profitable. These challenges
include our ability to:
 
  - increase our customer base and maintain existing customer relationships;
 
  - expand domestically and internationally;
 
  - provide scalable, reliable and cost-effective services;
 
  - develop our infrastructure to accommodate expanded and new facilities,
    additional customers and the increase of our network capacity;
 
  - expand our channels of distribution;
 
  - effectively establish our brand name;
 
  - retain and motivate qualified personnel; and
 
  - continue to respond to competitive developments.
                                        7
<PAGE>   8
 
Although we have experienced significant growth in revenues in recent periods,
we do not believe that this growth rate is necessarily a good indication of
future operating results. We might not ever achieve or sustain profitability.
Please see "Management's Discussion and Analysis of Financial Condition and
Results of Operations" for more detailed information concerning our losses and
other operating results.
 
OUR BUSINESS WILL SUFFER IF WE DO NOT EXPAND AND MAINTAIN OUR CUSTOMER BASE
 
Our success depends on the continued growth of our customer base and the
retention of our customers. Our ability to attract new customers depends on a
variety of factors, including:
 
  - the willingness of businesses to outsource their Internet operations;
 
  - the reliability and cost-effectiveness of our services; and
 
  - our ability to effectively market such services.
 
To attract new customers we intend to significantly increase our sales and
marketing expenditures. However, our efforts might not result in more sales as a
result of the following factors:
 
  - we may be unsuccessful in implementing our marketing strategies;
 
  - we may be unsuccessful in hiring a sufficient number of qualified sales and
    marketing personnel; and
 
  - any implemented strategies might not result in increased sales.
 
Our marketing efforts include developing relationships with hardware providers,
system integrators, value added resellers and Web hosting companies. We may
limit our ability to increase revenues if we fail to develop these
relationships.
 
In the past, we have lost customers to other service providers for various
reasons, including lower prices and other incentives offered by competitors that
we do not match. Our customers might terminate or decide not to renew their
commitments to use our services. A majority of our customer contracts are
cancelable on 30 days notice.
 
WE EXPECT OUR OPERATING RESULTS TO FLUCTUATE
 
We have experienced significant fluctuations in our operating results from
quarter to quarter. As a result of these fluctuations, period-to-period
comparison of our operating results is not necessarily meaningful and should not
be relied upon as an indicator of future performance. We expect our future
operating results to fluctuate. Factors that are likely to cause these
fluctuations include:
 
  - demand for and market acceptance of our services;
 
  - capacity utilization of our Internet service exchange facilities;
 
  - fluctuations in data communications and telecommunications costs;
 
  - customer retention;
 
  - the timing and magnitude of capital expenditures;
 
  - costs relating to the expansion of operations;
 
  - expansion of existing facilities and completion of new facilities;
 
  - fluctuations in bandwidth used by customers;
 
  - introductions of new services or enhancements by us and our competitors;
 
  - the timing of customer installations and related payments;
 
  - the ability to maintain or increase peering relationships;
 
                                        8
<PAGE>   9
 
  - provisions for customer discounts and credits;
 
  - changes in our pricing policies and those of our competitors;
 
  - changes in regulatory laws and policies;
 
  - economic conditions, particularly those related to the Internet industry;
 
  - difficulties in collecting accounts receivable, particularly because many of
    our customers are in an emerging stage;
 
  - compensation costs related to certain option grants and warrants; and
 
  - decreased revenues during the summer months and other seasonal effects on
    sales.
 
In addition, a relatively large portion of our expenses are fixed in the
short-term, particularly with respect to data communications and
telecommunications costs, depreciation, real estate and personnel. Our future
operating results will be particularly sensitive to fluctuations in revenues
because of these and other short-term fixed costs.
 
Our operating results in the future may fall below the expectations of
securities analysts and investors. In this event, the trading price of our
common stock will likely decrease significantly. Please see "Management's
Discussion and Analysis of Financial Condition and Results of Operations" for a
more detailed analysis of our period-to-period results.
 
WE MAY FACE PROBLEMS IN CONNECTION WITH OUR EXPANSION PLANS
 
We are currently expanding our West Coast campus by developing an additional
Internet service exchange facility in San Jose, California. In addition, we are
planning to expand our East Coast campus by developing additional Internet
service exchange facilities in New York, New York and in the Washington D.C.
area. The successful expansion of these facilities will involve significant
planning and resources. We may face problems in connection with our expansion
plans and, as a result, these expansion plans may be delayed or never completed.
We have not yet entered into a facility lease for our planned expansion in the
Washington D.C. area. Please see "Business -- Facilities" for a more detailed
description of our planned Internet service exchange facilities.
 
Our expansion plans will face many obstacles. In order to carry out our
expansion plans, we must:
 
  - obtain the necessary permits and approvals;
 
  - enter into leases for proposed facilities;
 
  - pass the required inspections; and
 
  - hire the necessary contractors, builders, electricians, architects and
    designers.
 
Our expansion plans are subject to risks, such as:
 
  - construction delay;
 
  - cost estimation errors or overruns;
 
  - equipment and material delays or shortages;
 
  - inability to obtain necessary permits on a timely basis;
 
  - strain on management and diversion of our attention from day-to-day
    operations;
 
  - failure to timely hire the necessary employees, including management and
    sales personnel; and
 
  - failure to predict customer demand for new facilities.
 
                                        9
<PAGE>   10
 
In addition, our costs will increase as we expand. These increased costs
include:
 
  - expenses associated with hiring;
 
  - training and managing new employees;
 
  - purchasing new equipment;
 
  - implementing power and redundancy systems;
 
  - implementing multiple data communications and telecommunications
    connections; and
 
  - leasing additional real estate and depreciation.
 
For a discussion of the risks associated with our needs for additional funding,
please see the Risk Factor entitled "Additional funding may not be available if
we need it."
 
WE HAVE A LONG SALES CYCLE
 
A customer's decision to purchase our services involves a significant commitment
of resources. As a result, we have a long sales cycle. We also need to educate
customers regarding the benefits of co-location and Internet connectivity
services. We generally incur significant expenses in sales and marketing prior
to getting customer commitments for our services. As a result, our inability to
get customer commitments or delays due to the lengthy sales cycles could
significantly harm our operating results.
 
WE DEPEND ON THIRD PARTIES TO ESTABLISH AND OPERATE INTERNATIONAL INTERNET
SERVICE EXCHANGES
 
As part of our strategy, we plan to continue to make investments in joint
ventures and foreign companies that are expected to develop regional Internet
service exchange facilities in Europe and Asia and license our trademarks and
technology to these entities. We do not expect to control or manage any of these
foreign entities. As a result, we will be required to depend on the management
of these foreign entities to successfully establish and operate these regional
Internet service exchange facilities.
 
The ability of these foreign companies to successfully establish and operate
Internet service exchange facilities is subject to a number of risks over which
we will have little or no control. These risks include:
 
  - the inability to set up a data communications and telecommunications
    infrastructure in a cost-effective manner;
 
  - the inability to compete effectively in international markets; and
 
  - a potentially more rigorous set of laws within each foreign country.
 
These foreign companies are expected to operate under the AboveNet name. If
these foreign companies are not successful, they could significantly damage our
reputation and brand equity. Also, we have granted exclusive licenses in
Austria, Germany and the United Kingdom and expect to do the same in other
countries. Under the terms of the license agreements in those countries, the
foreign companies have at least one year in which to meet their performance
targets before they risk losing exclusivity in their territories. Because of
these restrictions, if the foreign companies are not successful, we will not be
able to enter those markets on our own or with other third parties for a
significant period of time. For a description of our international Internet
service exchanges, please see "Business -- International Internet Service
Exchanges."
 
While our international sales are typically denominated in U.S. dollars,
fluctuations in currency exchange rates could cause our services to become
relatively more expensive to customers in a particular country, potentially
leading to a reduction in sales to local customers.
 
                                       10
<PAGE>   11
 
WE FACE INTENSE COMPETITION FROM OTHER COMPANIES
 
Our business is intensely competitive. We expect to face additional competition
from existing competitors and new market entrants in the future as there are few
substantial barriers to entering the co-location service business. We must
distinguish ourselves through the quality of our network performance, service
offerings and brand name recognition. We may be unsuccessful in doing this. In
addition, our business model of establishing centralized Internet service
exchange facilities may not be widely adopted over the model established by
other outsource providers who have developed and are continuing to develop
numerous geographically dispersed facilities. We cannot be certain that we will
have the resources or expertise to compete successfully in the future.
 
Some of our competitors have certain advantages over us. These advantages
include:
 
  - substantially greater financial, technical and marketing resources;
 
  - larger customer bases;
 
  - longer operating histories;
 
  - greater name recognition; and
 
  - more established relationships in the industry.
 
Our competitors may be able to utilize these advantages to:
 
  - expand their offerings more quickly;
 
  - adapt to new or emerging technologies and changes in customer requirements
    more quickly;
 
  - take advantage of acquisitions and other opportunities more readily;
 
  - devote greater resources to the marketing and sale of their services; and
 
  - adopt more aggressive pricing and incentive policies.
 
In addition, some of our competitors have offered co-location services at prices
lower than ours. Furthermore, some competitors offer incentives we do not match.
These incentives include free start-up and domain name registration, periods of
free service and low-priced Internet access. This and future price competition
may have a material adverse effect on our business and operating results.
 
In addition, some competitors have entered into joint ventures, consortiums or
consolidations to provide services competitive with our services. As a result,
these competitors may be able to provide customers with additional benefits,
including reduced communications costs, which could reduce the overall costs of
their services relative to our services. We might not be able to offset the
effects of those price reductions. We also believe that companies seeking
co-location and Internet connectivity for their business critical Internet
operations may use more than one company to provide this service. As a result,
these customers would be able to more easily shift the amount of service and
bandwidth usage from one provider to another. We may also face competition from
our suppliers.
 
WE MAY NOT BE ABLE TO MANAGE OUR GROWTH EFFECTIVELY
 
Our operating results and financial condition could suffer if we do not
effectively manage any growth that may occur. We have recently experienced a
period of rapid growth with respect to the expansion of our Internet service
exchange facilities and our customer base. To manage our growth effectively we
must continue to:
 
  - expand our operating and financial procedures and controls;
 
  - replace or upgrade our operational, financial and management information
    systems;
 
                                       11
<PAGE>   12
 
  - attract, train, motivate, manage and retain key employees; and
 
  - increase substantially the size of our sales and marketing organization.
 
WE MAY NOT BE ABLE TO HIRE OR RETAIN THE KEY EMPLOYEES WE NEED
 
The market for highly qualified personnel is very competitive. Particularly, we
are dependent on our ability to significantly increase the size of our sales and
marketing organization. If we are unable to hire the key personnel we need, we
may provide poor service and/or have difficulty signing up new customers.
 
In addition, we depend on the ability of a new management team to effectively
execute our strategies. We recently hired many of our key employees. Between
August and December 1998, we hired our Senior Vice President and Chief Financial
Officer, our Vice President of Construction and Real Estate and our Vice
President of Marketing. In December 1998, we also promoted an employee to Vice
President of Sales. Our Vice President of Engineering joined us in February
1999. Because many members of our management team have worked together for a
short period of time, we have to effectively integrate these managers into our
operations.
 
We may lose some of our current key personnel and any loss may have an adverse
effect on our business. It is important that we retain our Chief Executive
Officer, Sherman Tuan, President and Chief Operating Officer, Warren J. Kaplan,
Chief Technical Officer, David Rand, and Senior Vice President of Sales and
Marketing, David Dembitz. Any of our officers or employees can quit at any time.
We maintain a key man insurance policy in the amount of approximately $1.1
million on the life of Mr. Tuan, but not on any other executive officers. Also,
all options to purchase common stock held by Mr. Kaplan vested upon the our
initial public offering.
 
WE MUST MAINTAIN AND INCREASE PEERING RELATIONSHIPS
 
The Internet is comprised of network providers who operate their own networks
and interconnect their networks at various public and private points. These
interconnections are called peering arrangements. Our establishment and
maintenance of peering relationships is necessary in order to effectively
exchange traffic with Internet service providers without having to pay the
higher costs of transit services and in order to maintain high network
performance levels. These arrangements are not subject to regulation and are
subject to changes in terms, conditions or costs. We may not be able to provide
our customers with affordable services if we are unable to maintain and increase
peering relationships with Internet service providers.
 
In addition, any increase in the costs associated with access to the Internet
that we are unable to pass to our customers may affect our financial condition
and operating results. We may have to spend more to maintain our relationships
with Internet service providers to the point where it becomes necessary to find
alternatives. These Internet service providers may increase their prices. In
turn, we may be required to identify alternative methods to distribute our
customers' content. These alternatives may not exist.
 
WE DEPEND ON THIRD PARTY SUPPLIERS
 
We depend on third parties to maintain and provide us key components for our
network infrastructure. Our financial condition may suffer if the third parties
we depend on to provide our network infrastructure either increase their cost to
us or fail to maintain the operational integrity of their networks. We, and our
customers, depend upon data communications and telecommunications providers,
such as MCI WorldCom, Sprint, Pacific Bell, Teleport Communications Group, a
subsidiary of AT&T, and WinStar Communications, Inc., to provide the data
communications and/or telecommunications capacity we require. As a result, the
service we provide our customers may be interrupted if our data communications
and telecommunications providers' systems fail. If these systems fail, our
reputation could be harmed or
 
                                       12
<PAGE>   13
 
our customers could leave. In addition, MCI WorldCom is a current competitor of
ours. Other data communications providers are potential competitors of ours.
 
Furthermore, some equipment we depend on is available only from limited sources
because of the quantities and quality we demand. Currently, we order all of our
routers from Cisco Systems, Inc. We believe we could find alternative sources to
supply routers in the event routers from Cisco Systems were unavailable.
However, we would need to train our personnel in the use of these alternative
routers. This training could cause delay or interruption of our services.
 
We have purchased fiber optic cable capacity between the U.S. and the United
Kingdom from Global Crossing Ltd. In March 1999, we entered into an agreement
with Global Crossing to purchase fiber optic cable capacity between the U.S. and
the Netherlands. This agreement is subject to us entering into an additional
agreement with Global Crossing for fiber optic cable capacity connecting certain
European cities. If the contemplated agreements are entered into we will be
dependent on Global Crossing Ltd. for fiber connectivity to and within Europe.
 
OUR SYSTEMS OR OTHER SYSTEMS ON WHICH WE DEPEND MAY FAIL
 
Our customers depend on our ability to provide continuous service. As a result,
if our service is interrupted, our reputation will be harmed and our customers
may leave. Our systems and our customers' systems risk damage from numerous
forces, including:
 
  - human error;
 
  - fire;
 
  - earthquakes;
 
  - floods;
 
  - power loss;
 
  - telecommunications failures; or
 
  - sabotage or vandalism.
 
In addition, our operations may be disrupted due to unannounced or unexpected
changes in transmission protocols or other technology.
 
We may be subject to legal claims and be liable for losses suffered by our
customers for disruption of service or damage to customer equipment. Our
contracts with our customers attempt to eliminate our liability for
consequential or punitive damages and for damage to customer equipment not
caused by our gross negligence or willful acts. However, those provisions may
not protect us from being held liable for those damages.
 
THE MARKET FOR CO-LOCATION AND INTERNET CONNECTIVITY SERVICES IS NEW AND MAY NOT
GROW
 
The market for co-location and Internet connectivity services is new and
evolving. As a result, our financial condition will be harmed if our market
fails to develop, or develops more slowly than we expect. The growth of our
market depends on several uncertain events or occurrences. These events or
occurrences include:
 
  - the growth of the Internet as a global communication and commerce medium;
 
  - the willingness of businesses to co-locate their Internet operations; and
 
  - our ability to successfully and cost-effectively market our services to a
    sufficiently large number of customers.
 
Our business may also suffer if our services do not achieve widespread
acceptance in this new market.
 
                                       13
<PAGE>   14
 
WE MUST BE ABLE TO EXPAND AND ADAPT OUR NETWORK INFRASTRUCTURE
 
We must continue to expand and adapt our network as the number of its users
grow, as its users place increasing demands on it, and as requirements change.
If we are unable to expand and adapt our network infrastructure, we may lose
customers. We have had limited deployment of our services. Accordingly, it is
difficult to determine if our network will be able to handle, connect and manage
large numbers of users at high transmission speeds. We may not be able to
provide our customers with the increasing levels of data transmission capacity
that they may require for a number of reasons, such as our possible inability to
raise the funds needed to develop the network infrastructure to maintain
adequate data transmission speeds and the lack of additional network capacity
from third-party suppliers. In addition, any future attempts we make to bolster
our network may be delayed or cause further complications. We may encounter
equipment or software incompatibility, among other things, if we upgrade our
network to increase its capacity. This may cause delays in our attempts to
expand or improve our services. For more detailed information regarding our
network, please see "Business -- Network Architecture".
 
WE MAY FACE RISKS AND COSTS ASSOCIATED WITH POTENTIAL FUTURE ACQUISITIONS
 
The costs and risks we may face if we pursue acquisitions of key technologies or
companies in the future may have an adverse impact on us. An acquisition may
result in the use of significant amounts of cash, potentially dilutive issuances
of equity securities, incurrence of debt or amortization expenses related to
goodwill and other intangible assets. Any acquisitions we may engage in may
involve numerous risks. These risks include:
 
  - difficulties in the assimilation of the operations, technologies, products
    and personnel of the acquired company;
 
  - the diversion of management's attention from other business concerns;
 
  - risks of entering markets in which we have no or limited direct prior
    experience; and
 
  - potential loss of key employees of the acquired company.
 
Our financial condition and operating results may be adversely affected if any
acquisitions occur.
 
WE DEPEND ON THE GROWTH AND PERFORMANCE OF THE INTERNET
 
Our success will depend in large part on growth in the use of the Internet. The
growth of the Internet is highly uncertain and depends on a variety of factors.
These factors include security, reliability, cost, ease of access, quality of
service and necessary increases in bandwidth availability. In addition, broad
adoption of the Internet for most business applications will require the
acceptance of a new medium of conducting business and exchanging information.
 
The recent growth in the use of the Internet has placed strain on the Internet.
This increased use has required the upgrade of routers and switches,
telecommunications links and other components forming the infrastructure of the
Internet by Internet service providers and other organizations with links to the
Internet. Any perceived weakening in the performance of the Internet could
undermine the benefits of our services. The benefits of our services are
ultimately dependent upon the speed and reliability of the networks operated by
third parties. Consequently, the emergence and growth of our market is dependent
on improvements being made to the entire Internet infrastructure to alleviate
overloading and congestion.
 
WE MAY NOT BE ABLE TO KEEP PACE WITH RAPID TECHNOLOGICAL CHANGES OR EMERGING
INDUSTRY STANDARDS
 
Our services will become relatively less useful to our customers if we are
unable to respond to technological advances. Our future success depends, in
part, on our ability to address the increasingly
 
                                       14
<PAGE>   15
 
sophisticated and varied needs of our current and prospective customers. Keeping
pace with technological advances in our industry may require substantial
expenditures and lead time.
 
In addition, future advances in technology may harm our business. We may not be
able to incorporate technology advances on a cost-effective or timely basis into
our business. Future technological advances may also make our services
unnecessary or less cost-effective for our customers. Also technological
advances may encourage businesses to rely on in-house personnel and equipment to
furnish the services we currently provide.
 
We currently intend to support emerging standards if they become established and
our failure to conform to prevailing standards or the failure of a common
standard to emerge could hurt our business.
 
WE FACE RISKS ASSOCIATED WITH THE SECURITY OF OUR SYSTEMS
 
Despite our design and implementation of a variety of network security measures,
unauthorized access, computer viruses, accidental or intentional action and
other disruptions could occur. In addition, we may incur significant costs to
prevent breaches in security or to alleviate problems caused by such breaches.
Any breaches that may occur could result in liability to us, loss of existing
customers and the deterrence of future customers. We have been sued by a
customer alleging that we negligently allowed the customer's consultant access
to the customer's servers co-located at our San Jose facility. Please see
"Business -- Legal Proceedings" for a more detailed description of this lawsuit.
 
WE OPERATE IN AN UNCERTAIN LEGAL LANDSCAPE
 
The adoption and interpretation of any future or currently existing regulations
might have a negative impact on our business. The Internet and our market are
relatively new. Many of the laws and regulations that govern us have yet to be
interpreted or enforced. It is likely that in the future many new laws will take
effect that will regulate the Internet and our industry. The applicability to
the Internet of existing laws governing issues such as property ownership,
copyrights and other intellectual property issues, taxation, libel, obscenity
and personal privacy is uncertain. Current and future laws and regulations may:
 
  - decrease the growth of the Internet;
 
  - decrease demand for our services; and
 
  - impose taxes or other costly technical requirements or otherwise increase
    the cost of doing business.
 
We operate over the Internet in multiple states and foreign countries. In
addition, we facilitate sales by our customers to end users located in many
states and foreign jurisdictions. As a result, we are potentially subject to the
laws and regulations of jurisdictions in which we are not qualified to do
business. These jurisdictions may claim that we are required to qualify to do
business as a foreign corporation in each such state or foreign country,
potentially subjecting us to additional taxes and lawsuits in these
jurisdictions.
 
WE MAY FACE LIABILITY AND OTHER RISKS AS A RESULT OF INFORMATION DISSEMINATED
THROUGH OUR NETWORK
 
The liability we may face as a result of information disseminated through our
network could have a negative impact on our financial condition. The law
relating to the liability of online services companies and Internet access
providers for information carried on or disseminated through their networks is
currently unsettled. It is possible that claims could be made against online
services companies, co-location companies and Internet access providers under
both United States and foreign law for defamation, negligence, copyright or
trademark infringement or other legal theories. Content distributed by some of
our current or future customers may be regulated or banned. As a result, we may
lose some of our customers if their content is regulated. We have received
letters from recipients of information transmitted by our customers objecting to
the nature and content of the information. Several private lawsuits seeking to
impose liability on online services companies and Internet access providers are
currently pending. In addition, legislation has been recently passed and
continues to be proposed that imposes liability for or prohibits the
transmission over the Internet of certain types of information.
 
                                       15
<PAGE>   16
 
We may need to implement measures to reduce our exposure to this potential
liability. These measures may require the expenditure of substantial resources.
We also may need to discontinue certain service offerings. The increased
attention focused upon liability issues as a result of these lawsuits, new laws
and legislative proposals could impact the growth of Internet use. We carry
general liability insurance, but it may not be adequate to compensate or may not
cover us in the event we become liable for information carried on or
disseminated through our networks.
 
In addition, some of our customers have sent unsolicited commercial e-mails from
servers co-located at our facilities to massive numbers of people, typically to
advertise products or services. This practice, known as "spamming," can lead to
complaints against service providers that enable such activities, particularly
where recipients view the materials received as offensive. Internet service
providers and other online services companies might deny network access to us if
undesired content or spamming were to be transmitted from servers co-located by
us. The loss of these services could adversely affect our business and operating
results.
 
THE PROTECTION OF OUR PROPRIETARY INFORMATION IS LIMITED
 
We have no patented technology. We rely on a combination of copyright,
trademark, service mark and trade secret laws and contractual restrictions to
establish and protect certain proprietary rights in our technology. The steps we
have taken to protect our intellectual property may be insufficient. Our
technology may be misappropriated or a third party may independently develop
similar technologies. The laws of certain foreign countries may not protect our
intellectual property rights to the same extent as do the laws of the U.S.
 
WE MAY BE ACCUSED OF INFRINGING THE PROPRIETARY RIGHTS OF OTHERS
 
Our business may be adversely affected by a claim that we are infringing the
proprietary rights of others. We have not been notified that we infringe the
proprietary rights of third parties. However, we might face claims of
infringement in the future. Any claim, whether meritorious or not, could be
time-consuming, result in costly litigation, cause service delays or require us
to enter into royalty or licensing agreements. Any royalty or licensing
agreements required might not be available at all or on terms acceptable to us.
 
ADDITIONAL FUNDING MAY NOT BE AVAILABLE IF WE NEED IT
 
Our business may suffer if we require additional funding and are not able to
obtain it. We expect to incur significant expenditures as part of our expansion
plans. In March 1999, we entered into a commitment to pay $7.5 million for
additional fiber optic capacity. This $7.5 million commitment is subject to us
entering into an additional commitment to purchase fiber optic capacity
connecting certain European cities, which commitment is expected to be
approximately $11.0 million. We intend to enter into additional arrangements to
secure fiber optic capacity for Europe, Asia and the Pacific Rim. These
agreements may require us to make substantial up front payments for long-term
capacity that could require us to seek additional debt or equity financing. In
addition, we have investment commitments and plan to continue to make future
investments in joint ventures and foreign companies to develop international
Internet service exchanges. We believe that, following this offering, our cash
reserves and available borrowings will be adequate to fund our operations for at
least the next 12 months. However, we may require additional funds either during
or after such 12 month period. Please see "Use of Proceeds."
 
Additional financing may not be available if required or may only be available
on terms that are not favorable to us. If additional funds are raised through
the issuance of equity securities, the percentage ownership of our stockholders
could be significantly diluted. Any new equity securities may have rights,
preferences or privileges senior to those of our stockholders. For a more
detailed description of our capital commitments and resources, please see
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and Notes 4, 9 and 12 of Notes to Financial Statements.
 
                                       16
<PAGE>   17
 
WE FACE RISKS ASSOCIATED WITH THE YEAR 2000 COMPUTER PROBLEM
 
Although we have taken precautions, we may still encounter problems attributable
to the Year 2000 issue. Many currently installed computer systems and software
products are coded to accept only two digit dates. These systems will need to
distinguish 21st century dates from 20th century dates. Any inability to do so
could result in system failures or miscalculations causing disruptions of
operations, including a temporary inability to process transactions, send
invoices or engage in similar normal business activities. As a result, many
companies' software and computer systems may need to be upgraded or replaced in
order to comply with such "Year 2000" requirements.
 
We are in the process of establishing procedures for evaluating and managing the
risks and costs associated with this problem. We believe our computer systems on
a stand-alone basis are currently Year 2000 compliant. We cannot assure you that
our computer systems are Year 2000 compliant.
 
We may face losses due to the failure of our customers or suppliers to ensure
that their systems are Year 2000 compliant. Many of our customers' and
suppliers' Internet operations may be impacted by Year 2000 complications. This
impact may result in decreased Internet usage or the delay or inability to
obtain necessary data communications and telecommunications capacity. These
delays may have a direct effect on our operations.
 
WE ARE SUBJECT TO INFLUENCE FROM PRINCIPAL STOCKHOLDERS, EXECUTIVE OFFICERS AND
DIRECTORS
 
Some of our stockholders own a large enough stake in us to have an influence on
matters presented to the stockholders. Our executive officers, directors and
greater than 5% stockholders (and their affiliates) will, in the aggregate, own
approximately 25.5% of our outstanding common stock after this offering. If
these parties acted in concert they could influence, among other things, the
election and removal of directors and any merger, consolidation or sale of all
or substantially all of our assets. This concentration of ownership may delay or
prevent a change in control, merger, consolidation, takeover or other business
combination involving us. They may discourage a potential acquirer from making a
tender offer or otherwise attempting to obtain control of us. As a result, this
concentration of ownership may have an adverse effect on our value.
 
OUR STOCK PRICE IS VOLATILE
 
The market price of our stock has and is likely to experience extreme
fluctuations in response to a number of factors. These factors include:
 
  - actual or anticipated variations in our results of operations;
 
  - announcements of technological innovations;
 
  - new services introduced by us or our competitors;
 
  - changes in financial estimates by security analysts;
 
  - conditions and trends in the Internet industry;
 
  - general market conditions; and
 
  - potential volatility due to the increase in the number of publicly traded
    shares in connection with this offering.
 
The Nasdaq National Market has experienced extreme price and volume
fluctuations, as have other stock markets. For example, from December 10, 1998,
the date of the initial public offering of our common stock, through March 31,
1999, our stock price rose from $13.00 per share to $130.88 and has on many days
fluctuated more than 10%. Similar market fluctuations have particularly affected
the market prices of equity securities of many technology companies. The effects
on the stock prices of these companies have often been unrelated or
disproportionate to the operating performance of these companies. The trading
 
                                       17
<PAGE>   18
 
prices of many technology companies' stocks are at or near historical highs and
reflect valuations substantially above historical levels. These trading prices
and valuations may fall significantly. In addition, these broad market factors
may adversely affect the market price of our common stock. Our stock price may
also be adversely affected by general economic, political and market conditions
such as recessions, interest rate changes or international currency
fluctuations. Class action litigation has often been instituted following
periods of volatility in the market price of a company's securities. We would be
adversely affected if such litigation were brought against us.
 
THIS OFFERING WILL BENEFIT SOME OF OUR EXISTING STOCKHOLDERS
 
The selling stockholders will receive substantial proceeds from selling their
shares of common stock in this offering. We will pay the offering expenses of
the selling stockholders in this offering other than the underwriting discount.
At an assumed offering price of $123.00 per share, the net proceeds to the
selling stockholders, most of whom are our affiliates, will be approximately
$151.1 million.
 
In addition, as a result of this offering, the pro forma net tangible book value
per share to existing stockholders will immediately increase and the net
tangible book value per share to new investors will immediately be diluted.
 
WE HAVE BROAD DISCRETION AS TO USE OF PROCEEDS
 
We estimate the net proceeds of this offering to be approximately $313.0
million. We expect to use the net proceeds for capital expenditures related to
the build-out of our facilities, increasing network capacity, potential
strategic investments, working capital and general corporate purposes. However,
we may change the allocation of these proceeds in response to economic or
industry developments or changes. Our management can spend the proceeds from
this offering in ways with which the stockholders may not agree. We cannot
predict that such proceeds will be invested to yield a favorable return. See
"Use of Proceeds."
 
WE HAVE ANTI-TAKEOVER PROVISIONS IN OUR CHARTER DOCUMENTS AND THERE ARE
PROVISIONS OF DELAWARE LAW THAT COULD PREVENT OR DELAY A CHANGE IN CONTROL OF
OUR COMPANY
 
Our certificate of incorporation, our bylaws and Delaware law contain provisions
that could make it more difficult for a third party to acquire us, even if doing
so would be beneficial to our stockholders. Such provisions include:
 
  - authorizing the issuance of up to 5,000,000 shares of "blank check"
    preferred stock;
 
  - providing for a classified board of directors with staggered, three year
    terms; and
 
  - prohibiting certain stockholder action by written consent.
 
We are currently considering other anti-takeover measures, including a
stockholders' rights plan. Please see "Description of Capital Stock" for a more
complete discussion of these matters.
 
YOU WILL EXPERIENCE IMMEDIATE AND SUBSTANTIAL DILUTION IN THE NET TANGIBLE BOOK
VALUE OF THE STOCK YOUR PURCHASE
 
The assumed public offering price is substantially higher than the net tangible
book value per outstanding share of common stock. Purchasers of our common stock
will incur immediate and substantial dilution of $99.07 per share in the net
tangible book value of our common stock from the assumed public offering price
of $123.00. Additional dilution will occur upon the exercise of outstanding
options.
 
                                       18
<PAGE>   19
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
Some of the statements under "Prospectus Summary," "Risk Factors," "Management's
Discussion and Analysis of Financial Condition and Results of Operations,"
"Business" and elsewhere in this prospectus are forward-looking statements that
involve risks and uncertainties. These forward-looking statements include
statements about our plans, objectives, expectations, intentions and assumptions
and other statements contained in this prospectus that are not statements of
historical fact. You can identify these statements by words such as "may,"
"will," "should," "estimates," "predicts," "potential," "continue," "strategy,"
"believes," "anticipates," "plans," "expects," "intends" and similar
expressions. We cannot guarantee future results, levels of activity, performance
or achievements. Our actual results and the timing of certain events may differ
significantly from the results discussed in the forward-looking statements.
Factors that might cause such a discrepancy include those discussed in "Risk
Factors" and elsewhere in this prospectus.
 
                                       19
<PAGE>   20
 
                                USE OF PROCEEDS
 
The net proceeds from the sale of the 2,700,000 shares of common stock offered
by us will be approximately $313.0 million assuming a public offering price of
$123.00 per share and after deducting the estimated underwriting discount and
estimated offering expenses payable by us. We will not receive any proceeds from
the sale of shares by the selling stockholders.
 
We currently expect to use $56.0 million to $72.0 million of the net proceeds of
this offering for capital expenditures associated with our planned expansion of
our West and East Coast campuses. We also expect to use a significant amount of
the net proceeds for the purchase of fiber optic capacity and related equipment.
In addition, we intend to use a portion of the net proceeds for strategic
investments in companies developing Internet service exchange facilities in
Europe and Asia.
 
The balance of the net proceeds of this offering will be used for working
capital and general corporate purposes. Although we may use a portion of the net
proceeds for possible acquisitions of businesses or technologies that are
complementary to our business, there are no current plans in this regard. We
may, however, change the allocation of these proceeds in response to
developments or changes that affect our business, our industry. Our management
may spend the proceeds from this offering in ways with which the stockholders
may not deem desirable. Pending use of the net proceeds for the above purposes,
we plan to invest such funds in short-term, investment grade, interest-bearing
securities. We cannot predict that the proceeds will be invested to yield a
favorable return.
 
                                DIVIDEND POLICY
 
We have never declared or paid cash dividends on our capital stock. We currently
expect to retain future earnings, if any, for use in the operation and expansion
of our business and do not anticipate paying any cash dividends in the
foreseeable future. Our debt facilities contain restrictive covenants that limit
our ability to pay cash dividends without the prior written consent of the
lender.
 
                          PRICE RANGE OF COMMON STOCK
 
Our common stock began trading publicly on the Nasdaq National Market on
December 10, 1998 and is traded under the symbol "ABOV." The following table
shows the high and low per share closing prices of our common stock, as reported
by the Nasdaq National Market for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                HIGH       LOW
                                                              --------   -------
<S>                                                           <C>        <C>
1998
  Second Fiscal Quarter (beginning December 10, 1998).......  $ 25.75    $ 12.13
 
1999
  Third Fiscal Quarter......................................  $131.88    $ 19.44
  Fourth Fiscal Quarter (through April 6, 1999).............  $130.88    $118.00
</TABLE>
 
On April 6, 1999, the closing price of our common stock on the Nasdaq National
Market was $123.00 per share, and on March 31, 1999 there were approximately 147
holders of record of the common stock.
 
                                       20
<PAGE>   21
 
                                 CAPITALIZATION
 
The following table sets forth the following information as of December 31,
1998:
 
  - our actual capitalization; and
 
  - our "as adjusted" capitalization that gives effect to the sale of 2,700,000
    shares of common stock at an assumed public offering price $123.00 per share
    in this offering, less the estimated underwriting discount and our estimated
    offering expenses.
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31, 1998
                                                              -----------------------
                                                               ACTUAL     AS ADJUSTED
                                                              --------    -----------
                                                                  (in thousands)
<S>                                                           <C>         <C>
Long term obligations, less current portion.................  $  6,500     $  6,500
Stockholders' equity:
  Preferred stock, $0.001 par value; 5,000,000 shares
     authorized; no shares issued and outstanding, actual
     and as adjusted........................................        --           --
  Common stock, $0.001 par value; 60,000,000 shares
     authorized, 13,593,956 shares issued and outstanding,
     actual; 16,293,956 shares issued and outstanding, as
     adjusted...............................................    89,327      402,362
  Common stock options......................................     3,467        3,467
  Deferred stock compensation...............................       (77)         (77)
  Accumulated deficit.......................................   (15,848)     (15,848)
                                                              --------     --------
          Total stockholders' equity........................    76,869      389,904
                                                              --------     --------
          Total capitalization..............................  $ 83,369     $396,404
                                                              ========     ========
</TABLE>
 
The number of outstanding shares of common stock excludes:
 
  - 1,897,124 shares of common stock issuable upon exercise of options
    outstanding under our 1996, 1997 and 1998 Stock Option Plans and non-plan
    options at a weighted average price of $4.50;
 
  - 172,658 shares of common stock issuable upon exercise of outstanding
    warrants at a weighted average exercise price of $8.76 per share;
 
  - 1,555,127 shares of common stock reserved for future issuance under our 1998
    Stock Option Plan; and
 
  - 156,250 shares of common stock reserved for future issuance under our 1998
    Employee Stock Purchase Plan.
 
                                       21
<PAGE>   22
 
                                    DILUTION
 
The net tangible book value of our common stock as of December 31, 1998, was
$76.9 million, or approximately $5.65 per share. "Net tangible book value" per
share represents the amount of total tangible assets less total liabilities,
divided by the number of shares of common stock outstanding. Dilution in the net
tangible book value per share represents the difference between the amount per
share paid by purchasers of shares of our common stock in this offering and the
net tangible book value per share of common stock immediately afterwards. After
giving effect to the sale of 2,700,000 shares of common stock offered by this
prospectus and after deducting the estimated underwriting discount and our
estimated offering expenses, our net tangible book value would have been $389.9
million, or approximately $23.93 per share. This represents an immediate
increase in net tangible book value of $18.28 per share to existing stockholders
and an immediate dilution in net tangible book value of $99.07 per share to new
investors. The following table illustrates this per share dilution:
 
<TABLE>
<S>                                                           <C>       <C>
Public offering price per share.............................            $123.00
                                                                        -------
  Net tangible book value per share as of December 31,
     1998...................................................  $ 5.65
                                                              ------
  Increase in net tangible book value per share attributable
     to the offering........................................   18.28
                                                              ------
Net tangible book value per share after giving effect to the
  offering..................................................              23.93
                                                                        -------
Net tangible book value dilution per share to new investors
  in the offering...........................................            $ 99.07
                                                                        =======
</TABLE>
 
This table excludes all options and warrants that were outstanding as of
December 31, 1998. See Notes 6 and 12 of Notes to Financial Statements. The
exercise of the outstanding options and warrants having an exercise price less
than the offering price would increase the dilutive effect to new investors.
 
                                       22
<PAGE>   23
 
                     SELECTED FINANCIAL AND OPERATING DATA
 
This section presents historical financial data of AboveNet Communications Inc.
You should read carefully the financial statements included in this prospectus,
including the notes to the financial statements. The selected data in this
section is not intended to replace the financial statements.
 
We derived the statement of operations data for the period from March 8, 1996
(inception) to June 30, 1996 and the years ended June 30, 1997 and 1998 and
balance sheet data as of June 30, 1997 and 1998 from the audited financial
statements included in this prospectus. Those financial statements were audited
by Deloitte & Touche LLP, our independent auditors. We derived the balance sheet
data as of June 30, 1996 from unaudited financial statements that are not
included in this prospectus. We derived the statement of operations data for the
six months ended December 31, 1997 and 1998 and balance sheet data as of
December 31, 1998 from the unaudited financial statements included in this
prospectus. We believe that the unaudited historical financial statements
contain all adjustments needed to present fairly the information included in
those statements, and that the adjustments made consist only of recurring
adjustments.
 
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS
                                                        PERIOD FROM                                  ENDED
                                                       MARCH 8, 1996    YEAR ENDED JUNE 30,      DECEMBER 31,
                                                       (INCEPTION) TO   --------------------   -----------------
                                                       JUNE 30, 1996      1997        1998      1997      1998
                                                       --------------   --------    --------   -------   -------
                                                          (In thousands, except per share and customer data)
<S>                                                    <C>              <C>         <C>        <C>       <C>
STATEMENT OF OPERATIONS DATA:
  Revenues...........................................      $   79       $   552     $ 3,436    $ 1,105   $ 4,446
                                                           ------       -------     -------    -------   -------
  Costs and expenses:
    Data communications and telecommunications.......          --           559       2,200        629     2,830
    Network operations...............................          20           417       1,572        444     2,023
    Sales and marketing..............................          19           382       1,618        475     3,493
    General and administrative.......................          66           434       1,621        476     2,061
    Depreciation and amortization....................          52           133         476        182     1,203
    Stock-based compensation expense.................          --            --       1,276         49     1,169
    Joint venture termination fee....................          --           431          --         --        --
                                                           ------       -------     -------    -------   -------
  Total costs and expenses...........................         157         2,356       8,763      2,255    12,779
                                                           ------       -------     -------    -------   -------
  Loss from operations...............................         (78)       (1,804)     (5,327)    (1,150)   (8,333)
  Interest expense...................................          --            (7)       (161)      (126)     (493)
  Interest income....................................          --             8          63         10       283
                                                           ------       -------     -------    -------   -------
  Net loss...........................................      $  (78)      $(1,803)    $(5,425)   $(1,266)  $(8,543)
                                                           ======       =======     =======    =======   =======
  Basic and diluted loss per share...................      $(0.62)      $ (9.17)    $(20.68)   $ (5.91)  $ (4.50)
                                                           ======       =======     =======    =======   =======
  Shares used in basic and diluted loss per share....         125           197         262        214     1,897
OTHER OPERATING DATA:
  Capital expenditures...............................      $  101       $   850     $ 4,145    $   298   $20,075
  Number of customers at period end..................          10           110         278        178       382
</TABLE>
 
<TABLE>
<CAPTION>
                                                                      JUNE 30,
                                                            -----------------------------    DECEMBER 31,
                                                             1996       1997       1998          1998
                                                            -------    -------    -------    ------------
                                                                           (in thousands)
<S>                                                         <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Cash and equivalents..................................     $ 89      $  331     $ 8,141      $67,904
  Working capital (deficit).............................       88        (946)      5,061       58,724
  Total assets..........................................      151       1,171      13,693       95,732
  Long-term obligations, net of current portion.........      210         116       9,325        6,500
  Total stockholders' equity (deficiency)...............      (73)       (262)        661       76,869
</TABLE>
 
See Notes 1 and 7 of Notes to Financial Statements for an explanation of the
method used to determine the number of shares used in computing basic and
diluted loss per share. Capital expenditures in the table above represent
purchases of property and equipment, including non-cash transactions such as the
acquisition of equipment under capital lease.
 
                                       23
<PAGE>   24
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
You should read this together with the financial statements and other financial
information included in this prospectus. This prospectus contains
forward-looking statements that involve risks and uncertainties. Our actual
results may differ materially from those indicated in the forward-looking
statements. Please see the "Special Note Regarding Forward-Looking Statements"
elsewhere in this prospectus. Our fiscal year ends on June 30. The fiscal year
ended June 30, 1997 is referred to as fiscal 1997 and the fiscal year ended June
30, 1998 is referred to as fiscal 1998.
 
OVERVIEW
 
We are a leading provider of high performance, managed co-location and Internet
connectivity solutions for electronic commerce and other business critical
Internet operations. We were founded in March 1996 and, in July 1996, began
providing co-location and Internet connectivity services to content providers at
our San Jose, California facility. In August 1997, we expanded our service
offerings to provide co-location and Internet connectivity services to Internet
service providers, enabling the development of our Internet service exchange
model. In July 1998, we opened our second Internet service exchange facility,
located in Vienna, Virginia, and completed an expansion of our San Jose Internet
service exchange facility. The San Jose facility currently has approximately
6,800 square feet of co-location space and the Vienna facility has approximately
12,000 square feet of co-location space.
 
We derive most of our revenues from bandwidth charges, with additional revenues
generated from charges related to space requirements and one-time installation
fees. Bandwidth and space requirement charges are billed on a monthly basis.
Space requirement charges include access to our network, proprietary tools and
management services. In most instances, we charge our customers for a set amount
of bandwidth availability and charge incremental fees if the customer uses
additional bandwidth. Our contracts range from month-to-month to multiple year
commitments, a majority of which are cancelable on 30 days notice. Revenues
relating to bandwidth usage and space requirement charges are generally
recognized in the period in which the services are performed. Installation fees
are recognized in the period of installation.
 
A significant component of our expenses relates to data communications and
telecommunications costs. Data communications costs consist primarily of
payments to network providers, such as MCI WorldCom, Sprint, Pacific Bell,
Teleport Communications Group, a subsidiary of AT&T, and WinStar Communications,
Inc. Telecommunications charges generally consist of one time fees for circuit
installation and variable recurring circuit charges. Monthly circuit charges
vary based upon circuit type, the distance the circuit spans and/or the circuit
usage, as well as the term of the contract.
 
We intend to create a global Internet service exchange network by connecting
centralized facilities in key domestic and international locations. As part of
this strategy we have made and intend to continue to make strategic investments
in joint ventures and foreign companies to develop Internet service exchanges in
Europe and Asia. In March 1999, we made an aggregate investment of approximately
$600,000 in foreign entities in Austria, Germany and the United Kingdom. These
entities will establish regional Internet service exchanges in those markets.
Under our agreements with these entities, we are required to invest an
additional $1.9 million in the quarter ending June 30, 1999. We have committed
to invest up to an additional $6.5 million in the aggregate in the German and
United Kingdom entities. We will account for these investments under the equity
method of accounting, which requires us to recognize our proportionate share of
the net income or loss of these entities.
 
To further our global strategy, we entered into a series of agreements in
December 1998 with Global Crossing Ltd. providing for the acquisition of a right
to use capacity on a fiber optic cable system between the U.S. and the United
Kingdom. The agreements, which have 25 year terms, provide for us to pay Global
Crossing up to approximately $8.3 million for the capacity in installments
during December 1998
                                       24
<PAGE>   25
 
and the third quarter of fiscal 1999. The capacity became available in March
1999. In the short term, we plan to resell all or a portion of the additional
capacity. In March 1999, we entered into another agreement with Global Crossing
for the acquisition of a right to use capacity on a fiber optic cable system
between the U.S. and the Netherlands. The agreement commits us to pay $7.5
million in a series of installments through December 30, 1999. Any outstanding
amounts will bear interest at the rate of 10.5% per year. Our commitment to pay
the $7.5 million to Global Crossing is conditioned on us entering into another
agreement with Global Crossing for the right to use capacity on a fiber optic
cable system connecting certain European cities. If we enter into this
contemplated agreement, we expect to pay up to $11 million for this capacity. We
might not enter into the contemplated agreement on expected terms, or at all. We
intend to enter into additional rights to use capacity on fiber optic cable
systems or other types of arrangements to secure capacity for Europe, Asia and
the Pacific Rim. These agreements may require us to make substantial up front
payments for long-term capacity which could be a significant use of the proceeds
of this offering. See Note 12 of Notes to Financial Statements.
 
We are establishing a West Coast campus by developing a second San Jose,
California Internet service exchange facility of approximately 124,000 square
feet, including approximately 61,000 square feet of co-location space. In March
1999, we opened this new facility with 4,500 square feet of co-location space
and we intend to build out an additional 6,800 square feet of co-location space
by the fall of 1999. Afterwards, we intend to build out approximately 13,000
additional square feet of co-location space by the spring of 2000. The build-out
of additional co-location space will occur incrementally over time based on
customer demand. In addition, we are establishing an East coast campus. We have
entered into a lease in New York, New York and intend to develop a smaller
Internet service exchange facility there. We intend to connect the New York
facility to our Vienna, Virginia facility by a high speed, high capacity fiber
optic cable connection. The New York facility is expected to be approximately
27,000 square feet, including approximately 11,000 square feet of co-location
space. The new facility is targeted to open in the fall of 1999. We intend to
complete the initial build-out of approximately 5,500 square feet of co-location
space and the build-out of additional co-location space incrementally over time
based on customer demand. We also plan to expand our East coast campus by
developing an Internet service exchange facility in the Washington D.C. area. We
target opening the facility in the second half of calendar year 2000. We have
not yet signed a lease for this facility. The development and equipping of these
facilities will significantly increase our fixed and operating expenses,
including expenses associated with hiring, training and managing new employees,
purchasing new equipment, implementing power and redundancy systems,
implementing multiple data communications and telecommunications connections,
leasing additional real estate and depreciation.
 
In connection with our international Internet service exchange investments and
our expansion plans, we expect our data communications and telecommunications
costs to significantly increase in order to expand our network capacity. We
expect this increase in costs to begin in the quarter ending June 30, 1999.
 
A key aspect of our strategy is to significantly increase our sales and
marketing activities through the expansion of our sales force, increased focus
on developing reseller channels and increased marketing efforts to build the
AboveNet brand. We expect sales and marketing expenses to increase substantially
in future periods.
 
We recently hired many of our key employees and officers. Our President and
Chief Operating Officer joined us in November 1997. Our Senior Vice President of
Sales and Marketing joined us in April 1998. Our Vice President of Construction
and Real Estate and Vice President of International -- Europe each joined us in
August 1998. Our Chief Financial Officer joined us in November 1998 and, in
December 1998, we hired a Vice President of Marketing and promoted an existing
employee to serve as the new Vice President of Sales. Our Vice President of
Engineering joined us in February 1999.
 
During late fiscal 1997 and 1998, we granted stock options and warrants to
strategic business partners and non-employees. Additionally, during fiscal 1998
and the first quarter of fiscal 1999, we granted a key executive stock options
at an exercise price below market. As a result, we recognized stock-based
compensation expense of approximately $1.3 million and $1.2 million in fiscal
1998 and the first
 
                                       25
<PAGE>   26
 
six months of fiscal 1999, respectively. At December 31, 1998, we had $77,000 of
deferred stock compensation which will be amortized through fiscal 2000.
 
In connection with our investments in international Internet service exchanges
in March 1999, we agreed to grant options to purchase up to 300,000 shares of
common stock to employees of those Internet service exchanges upon meeting
certain annual performance criteria over the next four years. We will recognize
compensation expense for these options as the performance criteria are being
achieved. In addition, we granted 42,500 options to purchase shares of common
stock to three non-employees, two of whom are members of our board of directors.
These options vest annually over three years and have a three-year term. We will
begin to recognize compensation expense for these service options in the quarter
ending June 30, 1999. While the ultimate amount of compensation expense for
these arrangements is unknown, the amount could be substantial as it will be
measured based on the value of the options when the options vest.
 
Since our inception in March 1996, we have experienced operating losses and
negative cash flows from operations in each quarterly and annual period. As of
December 31, 1998, we had an accumulated deficit of $15,848,500. The revenue and
income potential of our business and market is unproven, and our limited
operating history makes an evaluation of us and our prospects difficult. In
addition, although we have experienced significant growth in revenues in recent
periods, we do not believe that this growth rate is necessarily indicative of
future operating results. We may never achieve profitability or, if we achieve
profitability, we might not sustain profitability.
 
RESULTS OF OPERATIONS
 
The following table sets forth certain statements of operations data as a
percentage of revenues for the period from March 8, 1996 (Inception) to June 30,
1996, for the years ended June 30, 1997 and 1998 and for the six months ended
December 31, 1997 and 1998. This information should be read in conjunction with
the Financial Statements and Notes thereto included elsewhere in this
prospectus.
 
<TABLE>
<CAPTION>
                                                                             SIX MONTHS
                                         PERIOD FROM       YEAR ENDED           ENDED
                                        MARCH 8, 1996       JUNE 30,        DECEMBER 31,
                                        (INCEPTION) TO   ---------------   ---------------
                                        JUNE 30, 1996     1997     1998     1997     1998
                                        --------------   ------   ------   ------   ------
<S>                                     <C>              <C>      <C>      <C>      <C>
Revenues..............................      100.0%        100.0%   100.0%   100.0%   100.0%
Costs and expenses:
  Data communications and
     telecommunications...............         --         101.3     64.0     56.9     63.6
  Network operations..................       24.7          75.5     45.7     40.2     45.5
  Sales and marketing.................       24.3          69.4     47.1     43.0     78.6
  General and administrative..........       84.1          78.6     47.2     43.0     46.3
  Depreciation and amortization.......       65.6          24.1     13.8     16.4     27.1
  Stock-based compensation expense....         --            --     37.2      4.5     26.3
  Joint venture termination fee.......         --          78.1       --       --       --
                                            -----        ------   ------   ------   ------
     Total costs and expenses.........      198.7         427.0    255.0    204.0    287.4
                                            -----        ------   ------   ------   ------
Loss from operations..................      (98.7)       (327.0)  (155.0)  (104.0)  (187.4)
Interest expense......................         --          (1.3)    (4.7)   (11.4)   (11.1)
Interest and other income.............         --           1.5      1.8      0.8      6.4
                                            -----        ------   ------   ------   ------
Net loss..............................      (98.7)%      (326.8)% (157.9)% (114.6)% (192.1)%
                                            =====        ======   ======   ======   ======
</TABLE>
 
COMPARISON OF THE SIX MONTHS ENDED DECEMBER 31, 1997 AND 1998
 
Revenues. We derive most of our revenues from monthly bandwidth charges, with
additional revenues from space requirement charges and one-time installation
fees. Our revenues increased 302% from
 
                                       26
<PAGE>   27
 
$1.1 million in the six months ended December 31, 1997, to $4.4 million in the
six months ended December 31, 1998. This growth in revenues resulted primarily
from an increase in the number of customers, from 178 customers at December 31,
1997, to 382 customers at December 31, 1998. One customer, RemarQ Communities,
Inc. (formerly named Supernews, Inc.), accounted for 12% of revenues in the six
months ended December 31, 1997 and 10% of revenues in the six months ended
December 31, 1998. Our agreement with RemarQ Communities, Inc. has a term of one
year, which expires July 1999, and does not contain any minimum bandwidth usage
requirements.
 
Data Communications and Telecommunications. Data communications costs consist
primarily of payments to network providers. Telecommunications charges consist
of one-time fees for circuit installation and variable recurring circuit
charges. Our data communications and telecommunications expenses increased 350%
from $629,000 in the six months ended December 31, 1997, to $2.8 million in the
six months ended December 31, 1998. The increase is primarily due to the growth
in our customer base and usage of additional bandwidth. We expect that data
communications and telecommunications costs will continue to increase in
absolute dollars as we continue to expand our network infrastructure.
 
Network Operations. Network operations expenses are comprised primarily of
salaries, benefits and related expenses for our operations and engineering
personnel, as well as facility rent and expenses associated with maintaining our
co-location facilities. Our network operations expenses increased 355% from
$445,000 in the six months ended December 31, 1997, to $2.0 million in the six
months ended December 31, 1998. The increase is primarily due to the hiring of
additional operations and engineering personnel and associated costs. Most
recently, a significant factor in the increase has been due to the increased
staffing at the Vienna, Virginia Internet service exchange facility. We expect
that network operations expenses will continue to increase in absolute dollars
as we hire additional personnel to expand our operations.
 
Sales and Marketing. Our sales and marketing expenses are primarily comprised of
salaries, commissions and benefits related to our sales and marketing personnel,
the cost of our marketing and promotional efforts, including advertising,
printing and trade show costs, as well as related consultants' fees and travel
and entertainment expenses. Sales and marketing expenses increased 635% from
$475,000 in the six months ended December 31, 1997, to $3.5 million in the six
months ended December 31, 1998. This increase was due primarily to increased
compensation and related expenses resulting from the hiring of additional sales
and marketing personnel and increases in trade show, advertising and marketing
program costs. We expect that sales and marketing expenses will increase
substantially in future periods as we continue to expand our sales force and our
brand-building activities.
 
General and Administrative. Our general and administrative expenses are
comprised primarily of salaries and benefits for our management and
administrative personnel, as well as fees paid for professional services and
corporate overhead. General and administrative expenses increased 333% from
$476,000 in the six months ended December 31, 1997, to $2.1 million in the six
months ended December 31, 1998. This increase was primarily due to increased
compensation and related benefits associated with additional personnel,
increased professional services fees and the costs associated with supporting
our expansion. We expect that general and administrative expenses will continue
to increase in absolute dollars as we expand our operations and incur the higher
costs associated with being a publicly-traded company.
 
Depreciation and Amortization. Depreciation and amortization expenses relate
primarily to our facility improvement and construction efforts as well as
telecommunications equipment. Our depreciation and amortization expenses
increased 562% from $182,000 in the six months ended December 31, 1997 to $1.2
million in the quarter ended December 31, 1998. The increase is primarily due to
capital expenditures incurred during the second half of fiscal 1998 and the
first half of fiscal 1999 related to facility improvement and construction costs
in San Jose, California, the construction of our Internet service exchange
facility in Vienna, Virginia, and additional telecommunications equipment. We
expect to incur increased depreciation and amortization expenses related to our
planned Internet service exchange facilities, as well as the amortization of the
rights to use capacity on fiber optic cable systems.
 
Stock-based Compensation. During fiscal 1998 and 1999, we granted stock options
to a key executive at an exercise price below market prices on the dates of the
grants. Additionally, during late fiscal 1997 and
                                       27
<PAGE>   28
 
fiscal 1998 and 1999, we granted stock options and warrants to strategic
business partners and non-employees. Stock options and warrants result in
stock-based compensation charges, a portion of which is deferred and expensed
over the vesting period. On December 10, 1998, we completed our initial public
offering, at which time the vesting of a significant number of these options
accelerated. Consequently, the remaining deferred compensation costs related to
those options were recognized. For the six months ended December 31, 1998 and
December 31, 1997, stock-based compensation expenses were $1.2 million and
$49,000. At December 31, 1998, we had $77,000 in deferred stock compensation
which will continue to be amortized through fiscal 2000.
 
Interest Income (Expense), Net. Interest income (expense), net was $(117,000) in
the six months ended December 31, 1997 compared to $(210,000) in the quarter
ended December 31, 1998. Interest expense for the six months ended December 31,
1998 related to borrowings to finance equipment purchases and improvements to
our Internet service exchange facilities in San Jose, California and Vienna,
Virginia. Interest expense during the quarter ended December 31, 1997, was
primarily related to the issuance of warrants associated with our issuance of
convertible debt. We expect that interest expense will continue to increase in
absolute dollars as we enter into additional equipment leases and borrowing
facilities to finance expansion, including the development of our planned
Internet service exchange facilities.
 
COMPARISON OF FISCAL YEARS ENDED JUNE 30, 1997 AND 1998
 
Revenues. Our revenues increased 523% from $552,000 in fiscal 1997 to $3.4
million in fiscal 1998. This growth in revenues resulted primarily from an
increase in the number of customers, from 110 customers at June 30, 1997 to 278
customers at June 30, 1998. One customer, RemarQ Communities, Inc. (formerly
named Supernews, Inc.), accounted for 12% of revenues in fiscal 1997 and 14% of
revenues in fiscal 1998.
 
Data Communications and Telecommunications. Our data communications and
telecommunications expenses increased 294% from $559,000 in fiscal 1997 to $2.2
million in fiscal 1998. This increase is primarily due to the growth in our
customer base and usage of additional bandwidth.
 
Network Operations. Our network operations expenses increased 277% from $417,000
in fiscal 1997 to $1.6 million in fiscal 1998. The increase is primarily due to
the hiring of additional operations and engineering personnel and the costs
associated therewith.
 
Sales and Marketing. Sales and marketing expenses increased 323% from $383,000
in fiscal 1997 to $1.6 million in fiscal 1998. Sales and marketing expenses as a
percentage of total revenues decreased from 69% in fiscal 1997 to 47% in fiscal
1998. Of this increase, approximately $700,000 was due to increased compensation
and related expenses as the result of the hiring of additional sales and
marketing personnel. The increase was also attributable to increased marketing
program, trade show and advertising expenses. The decrease as a percentage of
revenue in fiscal 1998 was primarily due to increased revenues associated with
higher bandwidth utilization among the existing customer base, which had lower
associated sales and marketing expenses.
 
General and Administrative. General and administrative expenses increased 274%
from $434,000 in fiscal 1997 to $1.6 million in fiscal 1998. General and
administrative expenses as a percentage of revenues decreased from 79% in fiscal
1997 to 47% in fiscal 1998 due to the increase in revenues. Of this increase,
approximately $500,000 was due to increased compensation and related benefits
associated with additional personnel in management, finance and administration,
while the remaining increase was primarily attributable to the costs associated
with supporting our expansion.
 
Depreciation and Amortization. Our depreciation and amortization expenses
increased 258% from $133,000 in fiscal 1997 to $476,000 in fiscal 1998. The
increase is due to additional capital expenditures incurred during fiscal 1998,
primarily for telecommunications equipment.
 
Stock-Based Compensation. Stock-based compensation expense during fiscal 1997
and fiscal 1998 was zero and $1.3 million, respectively. Stock-based
compensation in fiscal 1998 related to services rendered
 
                                       28
<PAGE>   29
 
during fiscal 1998 and the acceleration of the vesting during the fourth quarter
of 1998 of certain non-employee stock option and warrant grants.
 
Joint Venture Termination Fee. In fiscal 1996, we entered into a joint venture
agreement with DSK, Inc. to cooperatively market and develop our services. We
paid $33,700 to DSK during the year ended June 30, 1997 related to this
agreement. In the fourth quarter of fiscal 1997, we terminated this agreement
and hired the majority shareholders of DSK as employees or consultants by
issuing 500,000 fully vested shares of Series B preferred stock with a fair
value of $1.20 per share, or $600,000, for the outstanding shares of common
stock of DSK. We recorded the transaction by allocating the value of the shares
issued to property and equipment (at DSK's net book value of $169,000, which
approximated fair market value), with the balance of $431,000 reflected as a
joint venture termination fee.
 
Interest Income (Expense), Net. Interest income (expense), net decreased from
$1,000 in fiscal 1997 to $(98,000) in fiscal 1998. The decrease was primarily
the result of higher interest expense related to the issuance of stock purchase
warrants in conjunction with the issuance of our convertible debt during the
first half of fiscal 1998 as well as increased borrowings to finance equipment
purchases and improvements to our San Jose, California Internet service exchange
facility and construction of our Vienna, Virginia Internet service exchange
facility.
 
INCEPTION THROUGH JUNE 30, 1996
 
We generated $79,000 in revenues in the period from inception to June 30, 1996,
primarily as a result of consulting services provided as we were developing our
tools and preparing to commence our current co-location and Internet
connectivity operations. Our costs and expenses during this period consisted
primarily of salaries, depreciation and amortization expenses and consulting
services. Given the stage of our business and the shortness of the period, we do
not believe that the results of operations for this period are comparable to
fiscal 1997.
 
                                       29
<PAGE>   30
 
QUARTERLY RESULTS OF OPERATIONS
 
The following tables set forth certain unaudited statement of operations data
for the six quarters ended December 31, 1998, as well as the percentage of our
revenues represented by each item. This data has been derived from unaudited
interim financial statements prepared on the same basis as the audited Financial
Statements contained herein and, in the opinion of management, include all
adjustments consisting only of normal recurring adjustments, that we consider
necessary for a fair presentation of such information when read in conjunction
with the Financial Statements and Notes thereto appearing elsewhere in this
prospectus. The operating results for any quarter should not be considered
indicative of results of any future period.
 
<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED
                                -------------------------------------------------------------------
                                SEP. 30,   DEC. 31,   MAR. 31,    JUNE 30,    SEP. 30,    DEC. 31,
                                  1997       1997       1998        1998        1998        1998
                                --------   --------   ---------   ---------   ---------   ---------
                                                          (IN THOUSANDS)
<S>                             <C>        <C>        <C>         <C>         <C>         <C>
Revenues......................  $  430.9   $  674.6   $   963.3   $ 1,367.6   $ 1,793.1   $ 2,653.1
                                --------   --------   ---------   ---------   ---------   ---------
Costs and expenses:
  Data communications and
     telecommunications.......     256.0      372.8       639.1       931.9     1,079.9     1,749.8
  Network operations..........     221.8      222.8       411.8       715.4       772.8     1,250.0
  Sales and marketing.........     258.6      216.4       433.4       710.3     1,355.8     2,137.0
  General and
     administrative...........     198.9      276.9       483.8       661.9       812.7     1,248.1
  Depreciation and
     amortization.............      86.4       95.4       117.6       176.1       659.8       543.5
  Stock-based compensation
     expense..................      14.3       35.1       459.6       767.4       436.2       733.4
                                --------   --------   ---------   ---------   ---------   ---------
     Total costs and
       expenses...............   1,036.0    1,219.4     2,545.3     3,963.0     5,117.2     7,661.8
                                --------   --------   ---------   ---------   ---------   ---------
Loss from operations..........    (605.1)    (544.8)   (1,582.0)   (2,595.4)   (3,324.1)   (5,008.7)
Interest expense..............     (58.8)     (67.0)       (2.6)      (32.4)     (147.6)     (345.9)
Interest and other income.....       1.9        7.4        22.0        31.8       120.8       162.4
                                --------   --------   ---------   ---------   ---------   ---------
Net loss......................  $ (662.0)  $ (604.4)  $(1,562.6)  $(2,596.0)  $(3,350.9)  $(5,192.2)
                                ========   ========   =========   =========   =========   =========
</TABLE>
 
<TABLE>
<CAPTION>
                                                        THREE MONTHS ENDED
                                -------------------------------------------------------------------
                                SEP. 30,   DEC. 31,   MAR. 31,    JUNE 30,    SEP. 30,    DEC. 31,
                                  1997       1997       1998        1998        1998        1998
                                --------   --------   ---------   ---------   ---------   ---------
<S>                             <C>        <C>        <C>         <C>         <C>         <C>
Revenues......................     100.0%     100.0%      100.0%      100.0%      100.0%      100.0%
                                --------   --------   ---------   ---------   ---------   ---------
Costs and expenses:
  Data communications and
     telecommunications.......      59.4       55.3        66.3        68.2        60.2        66.1
  Network operations..........      51.5       33.0        42.8        52.3        43.1        47.1
  Sales and marketing.........      60.0       32.1        45.0        51.9        75.6        80.5
  General and
     administrative...........      46.2       41.1        50.2        48.4        45.3        47.0
  Depreciation and
     amortization.............      20.0       14.1        12.2        12.9        36.8        20.5
  Stock-based compensation
     expense..................       3.3        5.2        47.7        56.1        24.4        27.6
                                --------   --------   ---------   ---------   ---------   ---------
     Total costs and
       expenses...............     240.4      180.8       264.2       289.8       285.4       288.8
                                --------   --------   ---------   ---------   ---------   ---------
Loss from operations..........    (140.4)     (80.8)     (164.2)     (189.8)     (185.4)     (188.8)
Interest expense..............     (13.6)      (9.9)       (0.3)       (2.3)       (8.2)      (13.0)
Interest and other income.....       0.4        1.1         2.3         2.3         6.7         6.1
                                --------   --------   ---------   ---------   ---------   ---------
Net loss......................    (153.6)%    (89.6)%    (162.2)%    (189.8)%    (186.9)%    (195.7)%
                                ========   ========   =========   =========   =========   =========
</TABLE>
 
                                       30
<PAGE>   31
 
FACTORS AFFECTING OPERATING RESULTS
 
We have experienced significant fluctuations in our results of operations from
quarter to quarter. As a result of these fluctuations, period-to-period
comparison of our operating results is not necessarily meaningful and should not
be relied upon as an indicator of future performance. We expect our future
operating results to fluctuate. Factors that are likely to cause these
fluctuations include:
 
  - demand for and market acceptance of our services;
 
  - capacity utilization of our Internet service exchange facilities;
 
  - fluctuations in data communications and telecommunications costs;
 
  - customer retention;
 
  - the timing and magnitude of capital expenditures;
 
  - costs relating to the expansion of operations;
 
  - expansion of existing facilities and completion of new facilities;
 
  - fluctuations in bandwidth used by customers;
 
  - introductions of new services or enhancements by us and our competitors;
 
  - the timing of customer installations and related payments;
 
  - the ability to maintain or increase peering relationships;
 
  - provisions for customer discounts and credits;
 
  - changes in our pricing policies and our competitors;
 
  - changes in regulatory laws and policies;
 
  - economic conditions, particularly those related to the Internet industry;
 
  - difficulties in collecting accounts receivable as many of our customers are
    in an emerging stage;
 
  - compensation costs related to certain option grants and warrants; and
 
  - decreased revenues during the summer months and other seasonal effects on
    sales.
 
In addition, a relatively large portion of our expenses are fixed in the
short-term, particularly with respect to data communications and
telecommunications costs, depreciation, real estate and personnel. Our future
results of operations will be particularly sensitive to fluctuations in revenues
because of these and other short-term fixed costs.
 
As a result of these and other factors, our future operating results may fall
below the expectations of securities analysts and investors. In this event, the
price of our common stock will likely decrease significantly.
 
YEAR 2000 COMPLIANCE
 
Many currently installed computer systems and software products are coded to
accept only two digit entries in the date code field. These date code fields
will need to distinguish 21st century dates from 20th century dates. This could
result in system failures or miscalculations causing disruptions of operations
including, among other things, a temporary inability to process transactions,
send invoices or engage in similar normal business activities. As a result, many
companies' software and computer systems may need to be upgraded or replaced in
order to comply with such "Year 2000" requirements.
 
We have begun the first phase of our Year 2000 readiness review. The review will
include assessment, implementation, testing and contingency planning. To date,
we have evaluated our internally developed software and believe that this
software is Year 2000 compliant. However, we utilize software and hardware
developed by third parties both for our network and internal information
systems. We have not done any testing of such third party software to determine
if such software is Year 2000 compliant. We have sought
 
                                       31
<PAGE>   32
 
assurances from some of our vendors, and intend to continue to seek assurances
from others, that such vendors products are or will be Year 2000 compliant.
 
We expect to continue assessing and testing our internal information technology
and non-information technology systems into 1999. We are not currently aware of
any material operations issues or costs associated with preparing our internal
information technology and non-information technology systems for the Year 2000.
However, we may experience material unanticipated problems and costs caused by
undetected errors or defects in the technology used in our internal information
technology and non-information technology systems.
 
Based upon the public filings and press releases of our primary equipment,
telecommunications and data communications providers, we are aware that all such
providers are in the process of reviewing and implementing their own Year 2000
compliance programs. Since we do not believe that we will be afforded the
opportunity to test the systems of these providers, we will seek assurances from
them that they are Year 2000 compliant. If our primary vendors experience
business interruptions as a result of the failure to achieve Year 2000
compliance, our ability to provide Internet connectivity could be impaired,
which could have a material adverse effect on our business, results of
operations and financial condition.
 
We do not currently have any information regarding the Year 2000 status of our
customers, most of whom are private companies. However, we are in the process of
developing a plan to survey all of our customers regarding their Year 2000
compliance. As is the case with similarly situated companies, if our customers
experience Year 2000 problems, which result in business interruptions or
otherwise impact their operations, we could experience a decrease in the demand
for our services, which could have a material adverse impact on our business,
results of operations and financial condition.
 
We have not incurred any significant expenses to date associated with our Year
2000 plan and are not aware of any material costs associated with our
anticipated Year 2000 efforts. We believe that a material loss of revenues would
arise if our major customers or providers fail to achieve Year 2000 readiness.
We have not yet developed a comprehensive contingency plan to address the issues
which could result from such failure.
 
QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
 
We are exposed to fluctuations in interest rates and market values of our
investments. Our exposure to fluctuations in interest rates and market values of
our investments relates primarily to our short-term investment portfolio, which
is included in cash and cash equivalents and short-term investments. We have not
used derivative financial instruments in our investment portfolio. We invest our
excess cash in debt instruments of the U.S. Government, and, by policy, we limit
the amount of credit exposure to any one issuer. Due to the short-term nature of
our investments, the impact of interest rate changes would not be expected to
have a significant impact on the value of these investments. The effect of
interest rate and investment risk on us has not been significant.
 
Investments in both fixed rate and floating rate interest earning instruments
carry a degree of interest rate risk. Fixed rate securities may have their fair
market value adversely impacted due to a rise in interest rates, while floating
rate securities may produce less income than expected if interest rates fall.
Due in part to these factors, our future investment income may fall short of
expectations due to changes in interest rates or we may suffer losses in
principal if we are forced to sell securities which have declined in market
value due to changes in interest rates.
 
We are also exposed to interest rate risk on our fixed rate debt obligations. At
June 30, 1998 and December 31, 1998, fixed rate debt obligations totaled $1.2
million and $7.9 million, respectively. The fixed rate debt obligations bear
interest at annual rates ranging from 14.3% to 15.1% and are payable in 42
monthly installments. While generally an increase in market interest rates will
decrease the value of this debt, and decreases in rates will have the opposite
effect, we are unable to estimate the impact that interest rate changes will
have on the value of the substantial majority of this debt as there is no active
 
                                       32
<PAGE>   33
 
public market for the debt and we are unable to determine the market interest
rate at which alternate financing would have been available.
 
LIQUIDITY AND CAPITAL RESOURCES
 
We have financed our operations principally from the private and public sale of
equity securities and, to a lesser extent, lease financing. We had cash and cash
equivalents of approximately $67.9 million as of December 31, 1998.
 
Net cash used in operating activities was $1.1 million and $6.9 million for the
six months ended December 31, 1997 and 1998, respectively, and $777,000 and $1.8
million for fiscal years 1997 and 1998, respectively. Net cash used in operating
activities is primarily attributable to our net losses. These losses were
partially offset by depreciation and amortization, stock-based compensation
expense and increases in accounts payable and accrued liabilities.
 
Net cash used by investing activities was $298,000 and $14.6 million for the six
months ended December 31, 1997 and 1998, respectively, and $475,000 and $3.7
million in fiscal years 1997 and 1998, respectively. Net cash used by investing
activities consists primarily of purchases of property and equipment, including
costs associated with the establishment of our Internet service exchange
facility in Vienna, Virginia and the expansion of our Internet service exchange
facility in San Jose, California. In addition, in the six months ended December
31, 1998, we used cash to pay the first installment of $1.9 million toward the
purchase of an $8.3 million 25-year right to use fiber optic capacity. The
remaining payments for that purchase were made in the quarter ended March 31,
1999.
 
Net cash provided by financing activities was $2.4 million and $81.2 million for
the six months ended December 31, 1997 and 1998, respectively, and $1.5 million
and $13.3 million in fiscal years 1997 and 1998, respectively. Net cash provided
by financing activities for the six months ended December 31, 1997, and in
fiscal 1998 resulted primarily from the sale of notes and advances, partially
offset by debt and capital lease repayments. Net cash provided by financing
activities for the six months ended December 31, 1998 resulted primarily from
the proceeds of our initial public offering and, to a lesser extent, the
issuance of convertible preferred stock and utilization of our equipment
financing facility, partially offset by debt and capital lease repayments.
 
We have a $15 million equipment financing arrangement. Borrowings under this
arrangement are payable in 42 monthly installments. Borrowings incurred prior to
December 31, 1998, bear interest at the rate of 14.7% and borrowings subsequent
to December 31, 1998, bear interest at 13.25%. As of December 31, 1998,
approximately $6 million remained available for borrowings under this
arrangement. We expect to utilize the available credit for the development of
the planned second Internet service exchange facility in San Jose, California.
The Company also has a $2.5 million equipment lease facility, of which $2.0
million was available for future use at December 31, 1998.
 
We have a $750,000 line of credit facility with a bank, none of which was
outstanding at December 31, 1998. Borrowings under the line of credit facility
bear interest at the bank's prime rate plus 1% and the line of credit facility
expires in May 1999.
 
We currently expect to utilize approximately $56 million to $72 million for
capital expenditures in connection with the development of additional Internet
service exchange facilities in San Jose, California, New York, New York and in
the Washington, D.C. area.
 
In connection with a December 1998 agreement for the purchase of the right to
use fiber optic capacity between the U.S. and the United Kingdom we have a
remaining commitment to pay $800,000 as of March 31, 1999. In March 1999, we
entered into an agreement for the purchase of the right to use capacity on a
fiber optic cable system between the U.S. and the Netherlands which commits us
to pay $7.5 million in a series of installments through calendar year 1999. Any
outstanding amounts payable will bear interest at an annual rate of 10.5%. Our
commitment to pay the $7.5 million is conditioned on us entering into an
additional agreement for us to purchase fiber optic cable capacity connecting
certain
 
                                       33
<PAGE>   34
 
European cities. If we enter into this contemplated agreement, we expect to pay
up to $11.0 million for the right to use this capacity. We may enter into rights
to use fiber capacity or other types of arrangements to secure capacity for
Europe, Asia and the Pacific Rim. These agreements may require us to make
substantial up front payments for long-term capacity.
 
We believe that the net proceeds from this offering, together with existing cash
balances and financing arrangements, will provide us with sufficient funds to
finance our operations and planned capital expenditures for at least the next 12
months. We may require additional funds during or after this period to support
our working capital requirements or for other uses and may seek to raise
additional funds through public or private equity or debt financings or other
sources. Additional financing might not be available at all or on favorable
terms.
 
                                       34
<PAGE>   35
 
                                    BUSINESS
 
You should read the following description of our business together with the
information included elsewhere in this prospectus. This description contains
certain forward-looking statements based upon current expectations that involve
risks and uncertainties. Any statements contained herein that are not statements
of historical fact may be deemed to be forward-looking statements. You can
identify these statements by words such as "may," "will," "should," "estimates,"
"predicts," "potential," "continue," "strategy," "believes," "anticipates,"
"plans," "expects," "intends" and similar expressions. Our actual results and
the timing of certain events may differ significantly from the results discussed
in the forward-looking statements. Factors that might cause such a discrepancy
include those discussed in "Risk Factors" and elsewhere in this prospectus.
 
GENERAL
 
AboveNet is a leading provider of high performance, managed co-location and
Internet connectivity solutions for electronic commerce and other business
critical Internet operations. We have developed a network architecture based
upon strategically located, fault-tolerant facilities that combine co-location
services for Internet content providers with direct access to Internet service
providers, or ISPs, to create Internet service exchanges, or ISXs. As of March
31, 1999, we had 257 direct public and private data exchange connections, known
as peering arrangements, including relationships with most major network
providers. Our network architecture and extensive peering relationships are
designed to reduce the number of network connections or "hops" for data
travelling across the Internet. By having both Internet content providers and
ISPs at our ISXs we enable our ISP customers to provide their users with "one
hop" connectivity, through our local area network, to the Web sites of the
Internet content providers that are co-located at the same facility. As of March
31, 1999, we had 458 customers, including a wide range of Internet content
providers, Web hosting companies and ISPs.
 
INDUSTRY BACKGROUND
 
 The Growth of the Internet
 
The Internet has experienced tremendous growth and is emerging as a global
medium for communications and commerce. According to International Data
Corporation, or IDC, the number of Internet users worldwide will grow from 69
million at the end of 1997 to 320 million by 2002. Of the total number of
worldwide Internet users, IDC estimates that the number in Asia/Asia Pacific,
excluding Japan, will grow from 6.6 million in 1997 to 34.2 million in 2002 and
the number in Western Europe will grow from 16.8 million to 82.0 million in the
same period. In addition, according to Forrester Research, Inc., or Forrester,
the number of Internet sites worldwide is expected to grow from less than
500,000 in 1997 to approximately 4.0 million in 2002. The growth of the Internet
is being driven by a number of factors, including the large and growing
installed base of personal computers, improvements in network architectures,
increasing numbers of network-enabled applications, the emergence of compelling
content and commerce-enabling technologies, and easier, faster and cheaper
Internet access. The future growth in Internet usage is also projected to be
fueled by increased use of high speed access devices, such as cable, ADSL and
other high speed access devices as these become more widely available and
affordable. Forrester projects that the penetration of broadband Internet access
through cable, ADSL and other high speed access devices will grow from
approximately 200,000 households in 1997 to approximately 5.5 million households
in 2000 and approximately 17.6 million households in 2002. The increase in the
availability of high-speed access devices is also expected to increase the
demand for emerging high bandwidth technologies such as audio and video
streaming and voice over the Internet.
 
                                       35
<PAGE>   36
 
IDC estimates are based upon their Internet Commerce Market Model. This model
uses both supply and demand-side research based on responses from 40,000
interviews per year. Other data components include Web usage figures,
penetration rates, quarterly trend research, lead user research and device base
information. The estimates are subject to the following assumptions: no
catastrophic failure of the Internet will occur; regional economies will
continue their current expansion without upheaval; and security on the Internet,
as well as consumer confidence, will continue to improve slowly. The projected
amounts in this report may not be achieved.
 
Forrester estimates are based upon interviews with more than 41,000 households
as part of Forrester's "Technographics '98" survey. In addition, Forrester's
report stated that 81 ISPs were asked to provide detailed unit sales, prices and
projections for 1996 through 1998. The ISP data was extrapolated to provide a
total market size and direction. Finally, Forrester contacted 22 vendors of
hosting services and related organizations. Actual results may differ
significantly.
 
 The Expansion of Electronic Commerce
 
The functionality and accessibility of the Internet and commercial online
services have created an increasingly attractive commercial medium by providing
features that historically have been unavailable through traditional channels.
In the last several years, many enterprises that focus solely on delivering
services over the Internet have emerged and many businesses have implemented Web
sites and electronic commerce applications. Internet-based businesses have
developed Internet products and services in areas such as finance, banking,
entertainment, education and advertising, while other businesses are using the
Internet for an expanding variety of applications, ranging from corporate
publicity and advertising to sales, customer service, employee training and
communication with business partners. The ability to offer these kinds of
products and services requires high bandwidth Internet sites and operations. In
addition, due to advances in on-line security and payment mechanisms, the number
of businesses establishing commerce-enabled Web sites is expected to increase
dramatically. IDC estimates that the number of consumers buying goods and
services on the Internet will grow from 17.6 million in 1997 to 128.4 million in
2002, and that the total value of goods and services purchased over the Internet
will increase from approximately $12 billion in 1997 to approximately $425
billion by 2002.
 
 The Internet Infrastructure
 
The Internet is a worldwide network of private and public computer networks that
link businesses, individuals, government agencies, universities and other users
having disparate computer systems and networks. A multi-tiered system of local,
regional and national ISPs has evolved to provide connectivity among Internet
users. Data travelling across the Internet is broken down into multiple packets.
ISPs exchange these packets of data generated by their users through either
direct or indirect connections with other ISPs. Large ISPs often have multiple
direct data exchange connections with other ISPs, known as peering
relationships, either through private line connections between their routers or
through a public peering arrangement where multiple ISPs can be connected
through a single interface. However, significant peering relationships are
generally unavailable to many small and mid-sized ISPs and, even if available,
the associated telecommunications costs could be prohibitive. As a result, these
ISPs typically need to purchase indirect connection services, known as
"transit," from a third party ISP.
 
To address the needs of ISPs to exchange data at centralized points, a series of
Internet exchanges were established by Internet backbone providers. Although
there are numerous exchanges, the Company believes the two principal exchanges
in the United States, based upon traffic volume, are MAE West in San Jose,
California, and MAE East in Vienna, Virginia. Despite the relatively centralized
nature of these exchange points, data travelling across the dispersed Internet
architecture often must make multiple connections or "hops" through a variety of
local, regional and national ISPs, as data moves from the originating site to
the Internet backbone and back to the destination site.
 
                                       36
<PAGE>   37
 
 The Trend Toward Outsourcing of Internet Operations
 
Internet operations are increasingly becoming critical to an enterprise's
commercial and communication operations. Internet-based businesses and other
enterprises need non-stop, non-congested, fault-tolerant and scalable Internet
operations to allow them to perform sophisticated digital communications and
commerce transactions globally over the Internet. However, many businesses that
are seeking to establish these sophisticated Internet operations lack the
resources and expertise to cost-effectively develop, maintain and continually
enhance the necessary facilities and network systems. In addition, individuals
with the expertise to establish and maintain a sophisticated Internet service
are scarce and their services are costly. Furthermore, businesses often find it
difficult to keep up with new technology introductions and to integrate new
technologies into their own information technology infrastructure. Finally, many
businesses are currently being forced to deploy their limited information
technology resources to address the impending Year 2000 issues. As a result of
these and other factors, many enterprises are seeking outsourcing arrangements
to enhance Web site reliability and performance, provide continuous operation of
their Internet solutions, reduce related operating expenses and focus on their
core business. By outsourcing these services, businesses, particularly non
Internet-centric enterprises, can focus on their core business rather than using
their resources to support their Internet operations. Forrester estimates that
by 2002, approximately 40% of Internet Web sites will be outsourced and that
Internet hosting revenues for complex sites will increase from approximately
$200 million in 1997 to almost $8 billion by 2002.
 
 The Emergence of Co-Location Services
 
A variety of companies including Web hosting companies and ISPs have begun to
focus on providing Internet co-location services. These co-location companies
typically build networks of numerous geographically dispersed data centers in
order to be physically close to their customers. As a result of this dispersed
geographic network, data moving from one customer to another is subject to
increased risks of latency and data loss, as data travels across multiple
network connections or "hops." These problems are compounded by the lack of
available tools to monitor all of the various connection points on the Internet
in order to identify and avoid the congested links which can cause latency and
data loss. While these problems existed to some extent with early, less data
intensive applications, such as e-mail, they are becoming increasingly acute
with the growth of bandwidth intensive applications such as audio and video
streaming. In addition, many co-location providers do not have the flexibility
or capacity to quickly scale their services to meet the sharp growth and high
bandwidth requirements of business critical Internet operations.
 
Internet co-location companies also typically fail to address the increasing
need of local and regional ISPs to provide enhanced connectivity to compelling
content for their customers. Without the ability to maintain extensive peering
relationships with large ISPs, the cost of providing redundant, reliable and
scalable connectivity is often prohibitive for these local and regional ISPs. As
a result, they face increasing congestion as emerging applications consume more
bandwidth. International ISPs are also seeking a means to obtain fast, reliable
access to the large concentration of U.S.-based content. While many of these
problems could be addressed if these ISPs co-located their facilities with
content providers, many of the Web hosting and co-location companies also
compete with ISPs for sales of Internet access and, therefore, ISPs are often
reluctant to co-locate in their facilities.
 
THE ABOVENET SOLUTION
 
AboveNet provides high performance, managed co-location and Internet
connectivity services to a wide range of Internet content providers, Web hosting
companies and ISPs. Our ISX facilities provide high performance, reliable and
scalable solutions for electronic commerce and other business critical
applications. We currently operate two ISX campuses, located near MAE West and
MAE East, using our suite of sophisticated network management and remote
monitoring tools. We believe that our centralized
 
                                       37
<PAGE>   38
 
network architecture provides enhanced connectivity while eliminating the need
to build numerous geographically dispersed data centers. Our ISX model offers
customers the benefits of combining co-location services with direct ISP access.
The convergence of content providers and ISPs at our ISXs enables ISPs to
provide their users with "one hop" connectivity, through our local area network,
to the co-located content site. This direct connectivity minimizes the risk of
delays and data loss often encountered in the transmission of data over the
public Internet infrastructure.
 
Our solution provides the following key advantages to our customers:
 
Scalability and Flexibility. Our services are designed to be highly scalable and
flexible in order to meet the needs of our customers as their Internet
operations expand. Our network is designed to enable us to quickly scale
bandwidth to meet our customers' needs. In addition, since we charge our
customers based on the amount of space and bandwidth they use, customers are
afforded a flexible, cost-effective path to increasing their Internet
operations. We also provide flexibility for our customers by supporting most
leading Internet hardware and software systems vendor platforms.
 
High Performance and Enhanced Connectivity. Our services are designed to enhance
Internet performance through redundant and high speed network design and we
provide monitoring, notification and diagnostic services twenty-four hours a
day, seven days a week. We are able to address the high bandwidth needs and
rapid growth of our customers' business critical operations by maintaining an
extensive number of direct public and private network peering interconnections,
including peering relationships with major network providers. In order to
provide our customers with available and uncongested bandwidth during network
traffic spikes, we are committed to maintaining excess network capacity. The
amount of excess bandwidth at any given time depends upon many factors including
the timing of the addition of new circuits, the timing of customer additions and
increases in usage by existing customers.
 
Enhanced Access for ISPs. By connecting within our ISX, ISPs have "one hop"
connectivity to content providers co-located in the same facility. We believe
that by providing a means to reduce the number of "hops" in the transmission of
data, our network design offers significant benefits to international ISPs as
they seek to gain fast, reliable access to U.S.-based content. In addition, ISPs
that participate in our Internet service exchanges are able to take advantage of
peering relationships generally available only to major network providers.
 
Sophisticated Network Management Services and Tools. By leveraging the knowledge
gained from supporting many leading-edge Internet operations, we provide
sophisticated network management and monitoring services on 24 hours a day,
seven days a week basis. Our proprietary ASAP software monitors all of our
direct and indirect network connections for latency and packet loss, allowing
our network engineers to dynamically reroute traffic to avoid congested points.
By utilizing ASAP, we are able to identify and resolve many potential problems
before they impact an Internet site's availability or performance.
 
Remote Management Capabilities. We provide our customers with sophisticated
monitoring, reporting and management tools that can be accessed by customers
remotely to control their Internet hardware, software and application
environments. Our monitoring system probes each customer's equipment every five
minutes and provides the customer with notice of potential problems. We believe
that these tools, combined with our trained 24 hours a day, seven days a week
support staff, provide customers with a highly effective means of monitoring,
responding to and resolving problems, significantly reducing customers' needs
for on-site access to their equipment.
 
Fault-Tolerant Facilities. We have built fault-tolerant facilities designed to
enable the uninterrupted operations necessary for business critical Internet
operations. Each of our facilities is equipped with an uninterruptible DC and AC
power supply and back-up generators for power redundancy, multi-tiered fire
suppression systems, seismically braced racks, separate and redundant cooling
zones and security systems.
 
                                       38
<PAGE>   39
 
STRATEGY
 
Our objective is to become the leading global Internet service exchange network
for business enterprises and ISPs that require high-bandwidth and business
critical Internet operations. To achieve this objective, our strategy includes
the following key elements:
 
Build Brand Name. We intend to increase awareness of the AboveNet brand name
among Internet content providers, Web hosting companies and ISPs on a global
basis. We believe that associating the AboveNet brand with high quality and
technologically advanced network and services for outsourcing business critical
Internet operations is key to the expansion of our customer base. We have
recently begun to aggressively invest in building the AboveNet brand through
integrated marketing, including traditional and online advertising in business
and trade publications, trade show participations and public relations
campaigns. We also intend to continue to conduct seminars to increase awareness
of our services among potential customers.
 
Expand Customer Base. We intend to expand our customer base, which numbered 458
as of March 31, 1999, by significantly increasing our sales and marketing
efforts. Our direct sales force has grown to 35 persons as of March 31, 1999.
Our direct sales force is organized into groups to target leading Internet
content providers, Web hosting companies and ISPs. In addition, we have
personnel responsible for addressing the development of customers in the Asian
and European markets. Our sales force is supported in their sales efforts by
sales engineers and, in many instances, by our senior management. We intend to
significantly expand our direct sales force and sales engineers, as well as hire
experienced channel managers. We seek to establish and expand relationships with
potential channel partners including hardware vendors, value added resellers,
system integrators and Web hosting companies in order to leverage their sales
organizations.
 
Extend Internet Service Exchange Network Globally. We seek to create a global
ISX network by connecting centralized facilities in key domestic and
international locations. Domestically, we currently have ISXs in San Jose,
California (near MAE West) and Vienna, Virginia (near MAE East) and are
developing a second ISX facility in San Jose, California and a facility in New
York, New York. Additionally, we are planning to develop an ISX facility in the
Washington D.C. area. Internationally, we have formed joint ventures in Austria,
Germany and the United Kingdom with experienced Internet management teams and
strategic partners to develop regional ISXs. We intend to continue to expand our
European network, primarily through strategic investments in additional joint
ventures and foreign companies in major business centers and countries with high
levels of Internet traffic. We also intend to make similar investments in Asian
markets.
 
Leverage Internet Service Exchange Model. We intend to leverage our ISX model to
increase our customer base and generate recurring revenue. We believe that as
our customer base expands, the benefits to both content providers and ISPs of
our "one hop" solution will increase, creating greater incentives for new
customers to use our services. Since we charge these customers monthly based
upon space and bandwidth usage, we are generally able to increase revenue as our
customers' Internet usage grows. In addition, since our service fees are based
upon bandwidth usage, we believe that we are well positioned to capitalize on
the requirements of high bandwidth applications.
 
Address Emerging Internet Technology Markets. We believe that our centralized
ISX network will enable us to address the needs of emerging Internet
technologies such as audio and video streaming and voice over the Internet.
Since these applications require a solution that provides low latency and packet
loss, we believe that our high bandwidth, centralized network and enhanced
connectivity capabilities will enable us to offer significant advantages to
customers utilizing these emerging technologies.
 
THE ABOVENET INTERNET SERVICE EXCHANGE
 
Our ISX provides co-location services, Internet connectivity services and
network management services and tools. Our ISXs are designed to provide
customers with the high performance, scalability, connectivity,
 
                                       39
<PAGE>   40
 
security, reliability and expertise they need to enhance their business critical
Internet applications. We create solutions for our customers based on their
specific business and technical requirements, modifying the services as each
customer's needs evolve. Our services are primarily delivered through
centralized campuses located near MAE West and MAE East. Our planned New York
facility will be connected to our facility located near MAE East by high speed,
high capacity fiber optic cable. This planned facility is intended to facilitate
access to European Internet traffic. Our management services and tools enable us
and our customers to continuously manage customers' Internet operations jointly,
proactively and remotely.
 
 Co-Location Services
 
We provide co-location services designed to meet the demands of sophisticated,
multi-vendor business critical Internet operations. We support most leading
Internet hardware and software system vendor platforms, including those from
Ascend Communications, Inc., Nortel Networks, Cisco Systems, Inc., Compaq
Computer Corporation, Dell Computer Corporation, EMC Corporation,
Hewlett-Packard Company, International Business Machines Corporation, Lucent
Technologies Inc., Microsoft Corporation, Apple Computer, Inc., Network
Appliance, Inc., Silicon Graphics Inc., Sun Microsystems Inc. and 3Com
Corporation. This multi-vendor compatibility enables our customers to retain
control over their choice of technical solution and to integrate their Internet
operations into our existing information technology architecture. Because
business critical Internet operations are dynamic and often require timely
hardware and software upgrades to maintain targeted service levels, customers
have twenty-four hours a day, seven days a week physical and remote access to
the ISX facilities. Additional space and electrical power can be added as needed
in order to provide our customers with access to additional server co-location
services. Customers install and manage their own hardware and software at our
facilities and we do not provide any Web hosting services.
 
Our co-location facilities include dedicated electrical power circuits to ensure
that each customer's electrical power requirements are met. Each ISX facility is
constructed to address the requirements of business critical network operations
with an uninterruptible DC and AC power supply and back-up generators, FM-200
Fire Suppression with pre-action backup, HVAC, separate cooling zones,
seismically braced racks, twenty-four hours a day, seven days a week operations,
and high levels of physical security. Any damage to or failure of the systems of
our service providers could result in reductions in, or terminations of,
services supplied to our customers, which could have a significant adverse
effect on our business and operating results. See "Risk Factors -- Our systems
or other systems on which we depend on may fail."
 
Customers can select from shared rack facilities, secure cabinets or enclosed
cage facilities, based upon their business and technical requirements. These
facilities have the following features:
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------
 TYPE OF SPACE                        SIZE                                       FEATURES
- ---------------------------------------------------------------------------------------------------------
<S>               <C>                                            <C>
 Open Rack        Single shelf,  1/4,  1/2, or full 9' or        Entry-level service providing a
                  6' racks                                       cost-effective solution for our
                                                                 customers who do not need dedicated
                                                                 environments. Secured environment that
                                                                 is shared by multiple customers.
- ---------------------------------------------------------------------------------------------------------
 Cabriolet        9' or 6' stainless steel enclosed, secure      Dedicated, locked cabinet. Provides a
                  cabinet,  1/4,  1/2, or full rack              single rack with the security of a
                                                                 dedicated environment.
- ---------------------------------------------------------------------------------------------------------
 Cage             8' x 6', 8' x 8' or customized to              Dedicated, locked cage. Provides
                  order                                          flexibility in designing and configuring
                                                                 Internet servers, including space for
                                                                 multiple racks and other equipment.
- ---------------------------------------------------------------------------------------------------------
</TABLE>
 
                                       40
<PAGE>   41
 
 Internet Connectivity
 
Our Internet connectivity services are designed to meet the requirements of high
bandwidth, business critical Internet operations by providing highly reliable,
scalable, non-stop and uncongested operations. On March 31, 1999, we had peering
relationships with 257 network providers, including 78 private peering
relationships. Any failure by us to maintain and increase peering relationships
would have a material adverse effect on our business, results of operations and
financial condition. See "Risk Factors -- We must maintain and increase peering
relationships."
 
Our network is designed to minimize the likelihood of service interruptions.
Each ISX has multiple physical fiber paths into the facility. We maintain
multiple network links from multiple vendors and regularly check that our
network traffic traverses physically separated paths. This network architecture
enhances the availability of a customer's site, even in the event of a link
failure. In addition, since our customers' Internet operations often experience
network traffic spikes due to promotions or events, we have a policy of
maintaining significant excess capacity. We might not be able to expand or adapt
our telecommunications infrastructure to meet additional demand or our
customers' changing requirements on a timely basis and at a commercially
reasonable cost, or at all. See "Risk Factors -- We must be able to expand and
adopt our network infrastructure."
 
Our Internet connectivity services are also designed to reduce latency and to
enhance network performance. Our engineering personnel continuously monitor
traffic patterns and congestion points throughout the Internet and dynamically
reroute traffic flows to improve end-user response times. We also enhance
network performance by maintaining what we believe is among the largest number
of direct public and private network peering interconnections in the industry.
For customers seeking a direct communications link to the site of another
customer that is located at the same ISX, we offer highly secure, fast and
efficient cross-connections.
 
Our connectivity services utilize our proprietary ASAP technology to enhance
Internet connectivity by monitoring all of our direct and indirect network
connections for congestion.
 
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------
      TOOL                         DESCRIPTION                                   BENEFITS
- ---------------------------------------------------------------------------------------------------------
<S>               <C>                                            <C>
 ASAP --          ASAP automatically monitors all of our major   If packet loss and congestion is
 Asymmetric       providers' and peers' direct and indirect      detected on any of the links that
 Allocation of    connections on a real-time 24-hour basis to    directly affect customers' performance,
 Packets          identify congestion.                           our network engineers are able to
                                                                 dynamically reroute traffic temporarily
                                                                 away from the problem link. This
                                                                 functionality is particularly important
                                                                 for emerging applications such as audio
                                                                 and video streaming and voice over the
                                                                 Internet.
- ---------------------------------------------------------------------------------------------------------
</TABLE>
 
 Management Services and Tools
 
Our management services and tools support business critical Internet operations
by providing the customer with detailed monitoring, reporting and management
tools to control their hardware, network, software and application environments.
Through our network management services and tools, customers are able to
remotely manage their business critical Internet operations housed at our ISX
facilities. We believe that this provides an important advantage to enterprises
that seek to outsource a portion of their Internet operations and to link the
management of the outsourced operations with in-house operations. Our proactive
management services and tools enable us to identify and resolve hardware,
software, network and application problems, often before the customer is aware
that a problem exists.
 
                                       41
<PAGE>   42
 
Customers may access their co-located equipment by visiting the ISX facility or
by using our software tools and services for remote access. Using our remote
access tools, customers can perform emergency tasks, control power functions and
monitor their own system usage. These remote access tools alleviate the need for
us to build numerous, geographically dispersed ISX facilities. In the event of a
system problem, we notify our customer who can then attempt to resolve the issue
remotely. We intend to continue to enhance our software tools in order to meet
the needs of customers with business critical Internet operations. Our space
requirement charges include access to all of our management services and tools.
See "Risk Factors -- We may not be able to keep pace with rapid technological
changes or emerging industry standards."
 
We offer the tools and services summarized below:
 
<TABLE>
<S>              <C>                                     <C>
- -----------------------------------------------------------------------------------------------
TOOLS/SERVICES   DESCRIPTION                             BENEFITS
- -----------------------------------------------------------------------------------------------
 MRTG            MRTG is a widely used tool licensed by  MRTG shows customers the amount of
                 us that provides real-time monitoring   bandwidth being used and, therefore,
                 and management of bandwidth. Currently  the actual cost of that business
                 used by most major backbone providers,  expense. Through a graphical
                 MRTG generates HTML pages containing    interface, users can view, in
                 GIF images which provide a real-time    real-time, the actual amount of
                 visual representation of this traffic.  bandwidth flowing through their
                 MRTG can also be used to display        servers and/or networking equipment.
                 historical statistical data in graphic  MRTG also allows us and our customers
                 form.                                   to view our connections and bandwidth
                                                         usage with each of our backbone
                                                         providers.
- -----------------------------------------------------------------------------------------------
 EtherValve      EtherValve is a tool licensed by us     EtherValve allows us to provide each
                 that regulates the actual flow of       customer a clear channel of the
                 bandwidth from a customer's server      bandwidth purchased. This assures
                 through a 10 Mbps or 100 Mbps Ethernet  customers that they will have the
                 segment.                                bandwidth they have purchased
                                                         available to them at any given time.
                                                         EtherValve also allows the customer's
                                                         bandwidth to be scaled up immediately,
                                                         in increments as small as 8 bps (0.008
                                                         Kbps).
- -----------------------------------------------------------------------------------------------
 APS --          APS is a suite of proprietary tools     APS provides real-time information
 Automatic       developed to continually monitor the    about a customer's remote equipment.
 Pro-Active      performance of customer equipment.      APS automatically notifies the
 Services        Three levels of predetermined           customer and our technical personnel
                 escalation procedures include           of system malfunctions. Predetermined
                 automatic notification by e-mail,       escalation procedures customized for
                 notification by pager and automatic     each customer are then carried out by
                 power cycle.                            our personnel. Automatic rebooting and
                                                         other predetermined procedures often
                                                         serve to correct problems before the
                                                         customer is aware of the problem.
- -----------------------------------------------------------------------------------------------
 As-Ur-Here      As-Ur-Here provides various service     As-Ur-Here allows customers to
 Service         aspects including automatic remote      maintain access and control over their
                 power cycle and remote services         equipment and perform effective
                 terminal server access.                 equipment maintenance and problem
                                                         solving while they outsource their
                                                         servers and/or networking equipment.
- -----------------------------------------------------------------------------------------------
</TABLE>
 
                                       42
<PAGE>   43
 
CUSTOMERS
 
We have established a diversified base of customers including Internet content
providers, Web hosting companies and ISPs. As of March 31, 1999, we had
approximately 458 customers. One customer, RemarQ Communities, Inc., (formerly
named Supernews, Inc.) accounted for 12% and 14% of our revenues in fiscal 1997
and 1998, respectively. No other customer accounted for more than 10% of
revenues in either fiscal 1997 or 1998. Our success is substantially dependent
on the continued growth of our customer base and the retention of our customers.
Our customer base increased from 278 at June 30, 1998 to 382 at December 31,
1998 to 458 at March 31, 1999. We had a monthly customer retention rate of 97.8%
or greater in each of the nine months ended March 31, 1999. See "Risk Factors --
We must grow and retain our customer base."
 
The following is a representative list of customers as of March 31, 1999:
 
<TABLE>
<S>                                        <C>                              <C>
</TABLE>
 
<TABLE>
- ----------------------------------------------------------------------------------------------------------
        INTERNET CONTENT PROVIDERS              WEB HOSTING COMPANIES                    ISPS
<S>                                        <C>                              <C>
- ----------------------------------------------------------------------------------------------------------
  e-Media, LLC                             Bay Area Gold                    AT&T Solutions
  Imagine Radio, Inc. (acquired by MTV)    CNET Download.com                Direct Network Access, Ltd.
  IntelliChoice, Inc.                      FRNK Technology Group            Flashcom
  Netscape Communications Corporation      Floating Point Software          Got.Net Corporation
    (acquired by America Online, Inc.)     iXL, Inc.                        Hurricane Electric
  RealNetworks, Inc.                       Lars Mapstead                    Innetix
  RemarQ Communities, Inc.                 PulseWeb Ventures                KDD America
  Visual Dynamics LLC                      The Web Zone, Inc.               Linkage Online Limited
  WebMD, Inc.                              VirtuaLynx Internet, LLC         PH Communications
  Westech ExpoCorp.                        WebAsyst Corporation             Singapore Telecommunications
- ----------------------------------------------------------------------------------------------------------
</TABLE>
 
The following examples illustrate how our customers use our services:
 
  Internet Content Providers
 
- - RealNetworks, Inc. RealNetworks is a leading developer of software products
  and services designed to enable users of personal computers and other consumer
  electronic devices to send and receive audio, video and other multimedia
  services using the World Wide Web. RealNetworks uses our facilities to host
  its Web site for users to download its client and server software.
  RealNetworks selected us because of the speed and high performance of our
  network (enabling fast, reliable downloading of their products), our ability
  to rapidly scale the amount of bandwidth and our extensive peering
  relationships. Since becoming a customer in February 1998, RealNetworks has
  co-located an increasing portion of their downloading operations with us.
 
- - e-Media, LLC. e-Media's core focus is the production and broadcast of live
  events over the Internet. The viewers of these streaming events are sensitive
  to the visual degradation that occurs as a result of the Internet's packet
  loss and latency. e-Media moved to our facilities over six months ago to solve
  this degradation problem and meet the stringent demands of their Internet
  viewers. e-Media chose AboveNet because of our ability to scale to support the
  large and unpredictable number of online viewers for their live events.
 
- - RemarQ Communities, Inc. RemarQ, formerly named Supernews, is a leading
  Internet discussion service for corporate, ISP and individual clients. RemarQ
  serves hundreds of thousands of users through corporations, ISPs and direct
  subscriptions. RemarQ supports over 30,000 newsgroups and an average of 30
  gigabytes of data daily. As its business grew, RemarQ realized it had to
  outsource its Internet connectivity and the computers that served the Internet
  discussion groups. We reliably handle RemarQ's
 
                                       43
<PAGE>   44
 
  traffic which can reach 300 Mbps. The cost savings realized by co-locating
  provided RemarQ the ability to focus on its core business.
 
- - WebMD. WebMD is an Internet-based healthcare network that connects physicians,
  hospitals, third-party payers and consumers to a virtual world of medical
  information, tools, and services. WebMD needed to be able to send and receive
  their medical content quickly and securely. We provide WebMD with a secure,
  highly reliable co-location solution for the critical medical records located
  on WebMD's servers. Additionally, because WebMD's users come to the WebMD site
  from numerous ISPs, WebMD chose us because of our substantial public and
  private peering relationships. WebMD is co-locating at our San Jose,
  California and Vienna, Virginia ISXs.
 
  Web Hosting Companies
 
- - CNET Download.com. CNET is an Internet media company that operates a network
  of sites on the Web. Download.com, a division of CNET, is a leading site for
  downloading software titles. CNET Download.com selected us to provide
  co-location and connectivity services for its servers due to the high
  performance of our network and peering relationships with major ISPs and other
  large companies, including America Online, Inc. Our scalable bandwidth also
  allows CNET Download.com the flexibility necessary to accommodate traffic
  surges accompanying new software releases.
 
- - The Web Zone, Inc. The Web Zone, Inc. is a full service Internet and
  networking solutions company. Web Zone relies on us to offer its customers
  reliable, high performance Internet connection and secure facilities. Our
  connectivity and co-location services enable Web Zone to offer a full set of
  services including Web hosting to it's customers who want to focus on their
  core businesses and not the cost and problems associated with maintaining
  their own Web sites, servers and Internet connections.
 
  ISPs
 
- - PH Communications. PH Communications is a San Francisco Bay Area ISP that
  provides its customers access, Web hosting, e-mail and support services. PH
  Communications chose us to provide highly reliable and high performance
  co-location and Internet connectivity services. PH Communications uses our
  management tools, including APS and MRTG, to enable it to remotely manage its
  equipment and bandwidth utilization on a twenty-four hours a day, seven days a
  week basis. PH Communications has relied on the scalability and extensive
  peering relationships of our solution to support the growth of its business
  over the last two years.
 
- - KDD America. KDD America is a subsidiary of Japan's largest international
  telecommunications carrier, KDD Corporation. KDD America is a leading provider
  of global telecommunications services. KDD America selected AboveNet's San
  Jose, California facility as one of its primary U.S. Internet access points
  because of our scalable facility management and high performance network, our
  ability to rapidly scale the amount of available bandwidth and our extensive
  peering relationships.
 
INTERNATIONAL INTERNET SERVICE EXCHANGES
 
We are seeking to create a global network by investing in joint ventures and
foreign companies that can develop regional ISXs in Europe and Asia. In March
1999, we entered into agreements with local partners to establish regional ISXs
in Austria, Germany and the United Kingdom. We intend to continue to expand our
European network through additional investments in joint ventures in other major
business centers and countries with high levels of Internet traffic. These
regional service exchanges will be based on our business model and facility
design and will offer co-location and Internet connectivity services to both
Internet content providers and ISPs in their markets.
 
Austria. We founded AboveNet Austria GmbH (AboveNet Austria) in partnership with
Raiffeisen Rechenzentrum RRZ, an affiliate of the Raiffeisen group. We acquired
a 50% ownership interest in AboveNet Austria in consideration of a cash
investment and the grant of a royalty-free license to our tools
 
                                       44
<PAGE>   45
 
and trademarks. The Austrian ISX expects to be operational by the second half of
calendar year 1999. However, the development of this ISX might encounter
unanticipated delays.
 
Germany. We founded AboveNet Germany GmbH (AboveNet Germany) in partnership with
three German nationals. The German partners include founders of EUNet Germany, a
large German ISP which was subsequently acquired by UUNet, and managing
directors of the German Internet exchange point DE-CIX. We acquired a 50%
ownership interest in AboveNet Germany for a cash investment and the grant of a
royalty-free license to our tools and trademarks. The German ISX is currently
expected to be operational by the first quarter of calendar year 2000. However,
the development of this ISX might encounter unanticipated delays.
 
United Kingdom. We founded AboveNet UK Limited ("AboveNet UK") in partnership
with two Scottish nationals who were the founders of Teledata Holdings, a call
center and Internet services company which was acquired by Scottish Telecom in
1995. We currently have a 40% ownership interest in AboveNet UK for a cash
investment and the grant of a royalty-free license for our tools and trademarks.
The UK ISX is currently expected to be operational in the fourth quarter of
calendar year 1999. However, the development of this ISX might encounter
unanticipated delays.
 
We have currently committed up to an aggregate of $6.5 million in additional
financing to the joint ventures and have the right to participate in future
financings to maintain our percentage of interest. We also have a right of first
refusal to purchase the shares of our foreign partners if they seek to transfer
them to a third party. In addition, in Germany and the United Kingdom, we have
an option to purchase the shares of our partners in years three through five at
a price determined through an independent appraisal mechanism.
 
The investment in these regional ISXs subjects us to a number of risks. See
"Risk Factors --We depend on third parties to establish and operate
international Internet service exchanges."
 
SALES AND MARKETING
 
Our sales and marketing objective is to achieve broad market penetration and
increase brand name recognition among Internet content providers, Web hosting
companies and ISPs on a global basis through investments in the expansion of our
sales organization and extensive marketing activities. As of March 31, 1999, we
employed 46 persons in sales and marketing. We have developed a two-tiered sales
strategy to target leading Internet content providers, Web hosting companies and
ISPs through direct sales and channel relationships. See "Risk Factors -- We may
not be able to hire and retain the key employees we need."
 
 Direct Sales Force
 
We maintain a direct sales force of highly trained individuals in San Jose,
California, and Vienna, Virginia. As of March 31, 1999, we had 35 persons in
direct sales targeting Internet content providers, Web hosting companies and
ISPs. We also have personnel responsible for addressing the development of
customers in Asia and Europe. We are actively seeking to expand our direct sales
force and sales engineers. Substantially all of our sales are currently
generated by our direct sales force. Our sales force is supported in their sales
efforts by our sales engineers and, in many instances, by our senior management.
We believe that the integration of our sales engineers with our sales account
managers assists in both the establishment of customer relationships as well as
the migration of customers to increased use of our services. We have developed
programs to attract and retain high quality, motivated sales representatives
that have the necessary technical skills, consultative sales experience and
knowledge of their local markets. These programs include technical and sales
process training and instruction in consultative selling techniques. We have
also developed sales compensation plans which provide for significant incentives
for exceeding performance targets.
 
                                       45
<PAGE>   46
 
Under the terms of license, connectivity and marketing agreements entered into
between us and the joint venture entities, we have granted those entities the
exclusive right to use our tools and trademarks in their respective countries,
subject to meeting certain minimum performance targets. In return, the joint
ventures have agreed that, so long as they maintain their exclusivity under the
license, connectivity and marketing agreements, we will be their exclusive
provider of connectivity services.
 
 Develop Channel Relationships
 
We are seeking to develop relationships with potential channel partners
including hardware vendors, value added resellers, system integrators,
application hosting and Web hosting companies in order to leverage their sales
organizations. We believe that by leveraging the sales forces of these
companies, we can attract customers for our services in a cost-effective manner,
as well as provide co-branded Internet service offerings for our channel
partners. For example, some of our Web hosting customers market our service as
part of their overall bundled offering and we have been involved in joint
marketing and sales efforts with those customers. We are actively seeking to
hire experienced channel managers to focus exclusively on developing these
relationships. We also plan to develop seminar programs and other cooperative
sales programs to further develop these relationships.
 
 Marketing
 
Our strategy is to significantly expand our marketing efforts to stimulate
increased demand for our services and build the AboveNet brand. We plan to
aggressively invest in building the AboveNet brand through integrated marketing
campaigns, including traditional and online advertising in business and trade
publications, trade show participations, direct mail and public relations
campaigns to increase customer awareness and demand. We have also established a
client advisory council to strengthen our relationship with our customers.
 
NETWORK ARCHITECTURE
 
Our high performance network is designed to provide enhanced connectivity to our
customers. Our two Internet service exchange campuses are connected to one
another with high speed SONET circuits, and connected to the Internet through
public and private peering arrangements.
 
Our Internet service exchange campuses are located near MAE West and MAE East
and are connected to local Internet exchange points by multiple high-speed
backbone connections, provided by MCI WorldCom, Sprint, Pacific Bell, Teleport
Communications Group, a subsidiary of AT&T, and WinStar Communications. These
links to the local exchange points, combined with private exchanges with ISPs,
connect our customers' traffic to the Internet. We have engineered our peering
using a geographically diverse fiber path to provide high reliability, even in
the event of a link failure. We have developed dynamic rerouting and load
balancing technologies to enhance the performance of our customers' connections
Internet operations.
 
We have determined that as voice, video and other services are carried across
the Internet, the need for ATM in network infrastructures is reduced. We have
built our network using DS-3 and OC-3 clear channel circuits. By using clear
channel circuits, we are able to make highly efficient use of these connections,
lowering infrastructure costs and providing high performance connectivity.
Inside of each ISX facility, we have multiple local area networks, each
connected to the outside network through redundant routers and network
connections. These routers are configured such that in case of failure of a
single connection, or piece of equipment, alternative equipment or network paths
are automatically utilized, without human intervention, or performance
degradation. See "Risk Factors -- We depend on third party suppliers."
 
We utilize a combination of public and private peering in order to provide a
high level of network performance. On March 31, 1999, we had peering
relationships with 257 network providers including 78
 
                                       46
<PAGE>   47
 
private peering relationships. Our ISXs are connected to all of the major U.S.
Internet exchange points. The combination of public and private peering sessions
allows us to provide high levels of performance and reliability to their
customers. To ensure that this connectivity is not degraded, we have a policy of
providing significant excess capacity on all local area network, wide area
network and Internet exchange point connections in our network. Any failure to
maintain and increase peering relationships would have a material adverse effect
on our business, results of operations and financial condition. See "Risk
Factors -- We must maintain and increase peering relationships."
 
Our operations are dependent upon our ability to protect our network
infrastructure and customers' equipment against damage from human error, fire,
earthquakes, floods, power loss, telecommunications failures, sabotage,
intentional acts of vandalism and similar events. Despite precautions taken by,
and planned to be taken by us, the occurrence of a natural disaster or other
unanticipated problem at one or more of our Internet service exchange facilities
could result in interruptions in the services provided by us. Such an event
could significantly impact the ability of suppliers to provide the data
communications capacity required by us and could result in interruptions in our
services. See "Risk Factors -- Our systems or other systems on which we depend
on may fail" and "-- We face risks associated with the security of our systems."
 
CUSTOMER SERVICE AND QUALITY ASSURANCE
 
We offer a high level of customer service and quality assurance by understanding
the technical requirements and business objectives of our customers and
addressing their needs proactively on an individual basis. By working closely
with our customers, we are able to enhance the performance of our customers'
Internet operations, avoid downtime, resolve quickly any problems that may arise
and make appropriate adjustments in services as customer needs change over time.
We work with our customers to ensure that we are offering the appropriate types
and quality of service. We use advanced software tools to aid in our customer
monitoring and service efforts. We received our ISO 9002 certification in March
1998. As of March 31, 1999, we had 44 employees dedicated to customer service
and quality assurance.
 
Customer service begins before a sale, when we provide technical support for
complex orders. During the installation phase, we assign a transition team and a
project manager, who also retains responsibility for the account after
installation, to assist the new customer with the installation process. After
installation, the customer's equipment is overviewed by our network operation
center in San Jose, California, which is operated twenty-four hours a day, seven
days a week by engineers who answer customer calls, monitor site and network
operations and activate teams to solve problems that arise. Our customer service
personnel are also available to assist customers whose operations require
specialized procedures.
 
We believe that our quality assurance programs are key to building our brand
name. The objectives of our quality assurance system are to comply with ISO
9002: 1994 quality administration systems; to achieve and maintain a level of
quality that enhances our reputation with our customers; to ensure compliance
with relevant safety and environmental requirements; and to endeavor to deliver
high quality services to customers in an environment centered on adherence to
high legal and ethical standards.
 
COMPETITION
 
Our business is intensely competitive. There are few substantial barriers to
entering the co-location service business, and we expect that we will face
additional competition from existing competitors and new market entrants in the
future. We believe that participants in this market must grow rapidly and
achieve a significant presence in the market in order to compete effectively. We
believe that the principal competitive factors in our market are uncongested
connectivity, quality of facilities, level of customer service, price, the
financial stability and credibility of the provider, brand name and the
availability of network management tools. We might not have the resources or
expertise to compete successfully in the future. Our current and potential
competitors in the market include: (i) providers of co-location services, such
as Exodus Communications, Inc., Frontier GlobalCenter, Inc., which is being
acquired by Global
 
                                       47
<PAGE>   48
 
Crossing Holdings, Ltd, Hiway Technologies, Inc., which was acquired by Verio
Inc. and Globix Corporation; (ii) national and regional ISPs, such as Concentric
Network Corporation, PSINet, Inc., MCI WorldCom and certain subsidiaries of GTE
Corporation; (iii) global, regional and local telecommunications companies, such
as Sprint, MCI WorldCom and regional bell operating companies, some of whom
supply capacity to us; and (iv) large information technology outsourcing firms,
such as International Business Machines Corporation and Electronic Data Systems.
Some of these companies operate in one or more of these markets. In addition,
many of our current and potential competitors have substantially greater
financial, technical and marketing resources, larger customer bases, longer
operating histories, greater name recognition and more established relationships
in the industry than we do. As a result, some of these competitors may be able
to develop and expand their network infrastructures and service offerings more
quickly, adapt to new or emerging technologies and changes in customer
requirements more quickly, take advantage of acquisitions and other
opportunities more readily, devote greater resources to the marketing and sale
of their services and adopt more aggressive pricing policies than we can. In an
effort to gain market share, some of our competitors have offered co-location
services similar to ours at lower prices or with incentives not matched by us,
including free start-up and domain name registration, periods of free service
and low-priced Internet access. As a result of these policies, we may encounter
increasing pricing pressure which could have a significant adverse effect on our
business and operating results.
 
In addition, these competitors have entered and will likely continue to enter
into joint ventures, consortiums or consolidations to provide additional
services competitive with those provided by us. As a result, such competitors
may be able to provide customers with additional benefits in connection with
their co-location and network management solutions, including reduced
communications costs, which could reduce the overall costs of their services
relative to our services. We might not be able to offset the effects of any such
price reductions. In addition, we expect competition to intensify as our current
and potential competitors incorporate a broader range of bandwidth, connectivity
and Internet networking services and tools into their service offerings. We
believe that companies seeking co-location and Internet connectivity providers
for their critical Internet operations may use more than one company to provide
this service. As a result, these customers would be able to shift the amount of
service and bandwidth usage from one provider to another. We may also face
competition from our suppliers. Our agreements with our suppliers and other
partners do not limit or restrict those parties from offering similar services
to our customers, thereby enabling such parties to compete against us.
 
INTELLECTUAL PROPERTY RIGHTS
 
We rely on a combination of copyright, trademark, service mark and trade secret
laws and contractual restrictions to establish and protect certain proprietary
rights in our software. We have no patented technology that would preclude or
inhibit competitors from entering our market. We have generally entered into
confidentiality and invention assignment agreements with our employees in order
to limit access to and disclosure of certain of our proprietary information. We
cannot be certain that these contractual arrangements or the other steps taken
by us to protect our intellectual property will prove sufficient to prevent
misappropriation of our technology or to deter independent third-party
development of similar technologies. The laws of certain foreign countries may
not protect our services or intellectual property rights to the same extent as
do the laws of the U.S. We also rely on certain technologies that we license
from third parties. Two key technologies offered by us, MRTG and EtherValve, are
licensed from David Rand, our Chief Technical Officer. We have perpetual,
irrevocable, royalty-free worldwide licenses to both technologies. The license
to MRTG is non-exclusive and the license to EtherValve is exclusive subject to
one previously granted license. We do not license any other technology which is
not generally available. To date, we have not been notified that we infringe the
proprietary rights of third parties, but we cannot be certain that third parties
will not claim infringement by us. We expect that participants in our markets
will be increasingly subject to infringement claims as the number of
technologies and competitors in our industry segment grows. Any such claim,
whether meritorious or not, could be time-consuming, result in costly
litigation, cause service delays or require us to enter into royalty or
licensing agreements.
 
                                       48
<PAGE>   49
 
Such royalty or licensing agreements might not be available on terms acceptable
to us or at all. As a result, any such claim could have a material adverse
effect upon our business, results of operations and financial condition.
 
GOVERNMENT REGULATION
 
There is currently a small but growing body of laws and regulations directly
applicable to access to or commerce on the Internet. Due to the increasing
popularity and use of the Internet, it is likely that a growing number of laws
and regulations will be adopted at the international, federal, state and local
levels with respect to the Internet, covering issues such as user privacy,
freedom of expression, pricing, characteristics and quality of products and
services, taxation, advertising, intellectual property rights, information
security and the convergence of traditional telecommunications services with
Internet communications. Moreover, a number of laws and regulations have been
proposed and are currently being considered by federal, state and foreign
legislatures with respect to such issues. The nature of any new laws and
regulations and the manner in which existing and new laws and regulations may be
interpreted and enforced cannot be fully determined. For example, although
sections of the Communications Decency Act of 1996 (the "CDA") that, among other
things, proposed to impose criminal penalties on anyone distributing "indecent"
material to minors over the Internet, were held to be unconstitutional by the
U.S. Supreme Court, there can be no assurance that similar laws will not be
proposed and adopted. Legislation similar to the CDA could subject us and/or our
customers to potential liability, which in turn could have an adverse effect on
our business, operating results and financial condition. The adoption of any
future laws or regulations might decrease the growth of the Internet, decrease
demand for our services, impose taxes or other costly technical requirements or
otherwise increase the cost of doing business or in some other manner have a
significant adverse effect on us or our customers, which, in turn, could have a
significant adverse effect on our business and operating results. In addition,
applying existing laws governing issues such as property ownership, copyrights
and other intellectual property issues, taxation, libel, obscenity and personal
privacy to the Internet is uncertain. The vast majority of these laws were
adopted prior to the advent of the Internet and related technologies and, as a
result, do not contemplate or address the unique issues of the Internet and
related technologies. Changes to these laws intended to address these issues,
including some recently proposed changes, could create uncertainty in the
marketplace which could reduce demand for our services or increase the cost of
doing business as a result of costs of litigation or increased service delivery
costs, or could in some other manner have a significant adverse effect on our
business and operating results. In addition, as our services are available over
the Internet in multiple states and foreign countries, and as we facilitate
sales by our customers to end users located in these states and foreign
countries, these jurisdictions may claim that we are required to qualify to do
business as a foreign corporation in each of these states or foreign countries.
Any new legislation or regulation, or the application of laws or regulations
from jurisdictions whose laws may not currently apply to our business, could
have a significant adverse effect on our business and operating results.
 
EMPLOYEES
 
As of March 31, 1999, we had 130 employees, including 46 people in sales and
marketing, 62 people in customer service, network and backbone engineering and
product development and 22 people in general and administration. We believe that
our future success will depend in part on our continued ability to attract, hire
and retain qualified personnel. The competition for these personnel is intense,
and we might not be able to hire or retain these personnel. See "Risk
Factors -- We may not be able to manage our growth effectively," and "We may not
be able to hire or retain the key employees we need."
 
FACILITIES
 
Our principal executive and administrative offices are located in San Jose,
California and consist of approximately 20,000 square feet that are leased until
2008, with an option by us to expand to 2018. We
 
                                       49
<PAGE>   50
 
lease our ISX facilities in San Jose, California and Vienna, Virginia (in the
Washington, D.C. area). The San Jose, California facility consists of
approximately 10,000 square feet, including 6,800 square feet of co-location
space and is leased until 2008, with an option for us to extend to 2018. The
Vienna, Virginia facility, which consists of approximately 17,000 square feet,
including 12,000 square feet of co-location space is leased until 2007, with an
option for us to extend to 2012.
 
We are establishing a West Coast campus by developing a second ISX facility of
approximately 124,000 square feet, including approximately 61,000 square feet of
co-location space, near our San Jose, California facility. We opened this
facility with an initial build-out of 4,200 square feet of co-location space in
March 1999 and we intend to build out an additional 6,800 square feet of
co-location space by the fall of 1999. Afterwards, we intend to build out
approximately 13,000 additional square feet of co-location space by the spring
of 2000. The build-out of additional co-location space will occur incrementally
over time based on customer demand. The lease for this planned facility is a
twenty year lease commencing on the earlier of such time when any portion of the
facility can be occupied or one year following the earlier of the date on which
construction on the planned facility commences or should have commenced.
 
In addition, we are establishing an East Coast campus with plans to develop
another Internet service exchange in New York, New York which will be connected
by fiber optic cable to our Vienna, Virginia facility. This facility is expected
to be about 27,000 square feet, including approximately 11,000 square feet of
co-location space. We intend to initially complete the build-out of
approximately 5,500 square feet of co-location space and continue to add
co-location space over time based on customer demand. The lease for this planned
facility has a fifteen year term.
 
We are also planning to develop an additional Internet service exchange in the
Washington D.C. area to be a part of our East Coast campus. The target date for
opening the facility is in the second half of calendar 2000. However, we have
not entered into a lease for this planned facility. Any of the ISXs planned for
development might not be completed in a timely manner, or at all. See "Risk
Factors -- We may face problems in connection with out expansion plans."
 
LEGAL PROCEEDINGS
 
We have a dispute with one of our customers, Pathway Communications, Inc.,
involving one of Pathway's consultants. The consultant misrepresented his
identity to us to gain access to Pathway's servers in order to delete files. On
September 3, 1998, Pathway Communications filed a complaint against us for
negligence, breach of contract, conversion, and intentional and negligent
interference with prospective economic advantage in the Superior Court of the
State of California, County of Santa Clara. The lawsuit seeks general, special
and punitive damages upon proof, as well as costs and reasonable attorneys'
fees. We obtained an order requiring that the dispute be submitted to
arbitration. We intend to vigorously defend against such action. However, we
might not prevail in this litigation and this litigation might have a
significant adverse effect on our business or operating results.
 
We disagree with one of our network providers over currently invoiced amounts
and credits available to apply against amounts invoiced in the future. We
believe we are entitled to net credits under our agreements with them. We are
discussing a settlement of our disagreement, but we may be unable to reach a
mutually agreeable settlement. If a settlement is not reached, this dispute
might result in litigation. Litigation could be costly and could have an adverse
effect on our operating results, regardless of the outcome.
 
                                       50
<PAGE>   51
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS, DIRECTORS AND KEY EMPLOYEES
 
The executive officers, directors and key employees of AboveNet are as follows:
 
<TABLE>
<CAPTION>
                   NAME                      AGE                    POSITION
                   ----                      ---                    --------
<S>                                          <C>   <C>
Sherman Tuan...............................  45    Chairman of the Board and Chief Executive
                                                   Officer
Peter C. Chen, Ph.D.(2)....................  59    Vice Chairman of the Board
Warren J. Kaplan...........................  56    President, Chief Operating Officer and
                                                   Director
David Rand.................................  36    Chief Technology Officer
Stephen P. Belomy..........................  40    Executive Vice President and Secretary
David Dembitz..............................  45    Senior Vice President of Sales and
                                                   Marketing
David F. Larson............................  51    Senior Vice President and Chief Financial
                                                   Officer
Jerry Chen.................................  34    Vice President of International -- Asia
Avi Freedman...............................  29    Vice President of Engineering
Kevin Hourigan.............................  34    Vice President of Finance and Controller
Van D. Jepson..............................  45    Vice President of Marketing
Mark Kaleem................................  52    Vice President of Sales
Jeffrey Monroe.............................  32    Vice President of Construction and Real
                                                   Estate
Wayne Sanders..............................  56    Vice President of Corporate Development
Paul Steiner, Ph.D.........................  42    Vice President of International -- Europe
Robert A. Burgelman, Ph.D.(1)..............  53    Director
Frank R. Kline(2)..........................  48    Director
James Sha(1)...............................  48    Director
Tom Shao, Ph.D.(2).........................  64    Director
Kimball W. Small(2)........................  63    Director
Fred A. Vierra(1)..........................  67    Director
</TABLE>
 
- -------------------------
(1) Member of Compensation Committee
 
(2) Member of Audit Committee
 
Mr. Tuan, the founder of AboveNet, has served as Chief Executive Officer and a
Director since 1996, and President until January 1998. Mr. Tuan has served as
Chairman of the Board since August 1998. Mr. Tuan was President of InterNex
Information Services, Inc., an Internet infrastructure provider, from November
1994 to October 1995 and from February 1994 to November 1995 was President of
Tiara Computer, Inc., a network equipment manufacturer, which merged with
InterNex Information Services, Inc. in November 1994. From January 1992 to June
1993, Mr. Tuan was Vice President of Worldwide Sales and Marketing of Primus
Technologies, Inc., a provider of problem resolution and knowledge management
software, and President of Celerite Graphics, Inc., a manufacturer of video
chips. Mr. Tuan received an Electrical Engineering degree from Feng-Chia
University in Taiwan.
 
Dr. Chen has served as Vice Chairman of the Board since August 1998. Dr. Chen
served as Chairman from December 1996 to August 1998, and has been our Director
since March 1996. Dr. Chen is the Founder and Chairman of Crosslink Technology
Partners, an investment firm specializing in funding and developing early stage
semiconductor, healthcare and Internet related technology ventures, where he has
been employed since August 1992. From September 1983 to May 1992, Dr. Chen was
Founder, General
                                       51
<PAGE>   52
 
Manager and Chief Executive Officer of Mosel Corporation, a semiconductor
manufacturer in Taiwan. Dr. Chen received a B.S. in Engineering from National
Taiwan University and a Ph.D. in Engineering from Cornell University.
 
Mr. Kaplan has served as President, Chief Operating Officer and a Director since
January 1998, and as Acting President and Chief Operating Officer from November
1997 to January 1998. From March 1996 to November 1997, Mr. Kaplan was an
investor and consultant to various Internet software start-up companies. Mr.
Kaplan served as Chief Executive Officer and a director of Simply Interactive,
Inc., a software company, from June 1996 to December 1996, and was President
from April 1996 to June 1996. Until February 1996, Mr. Kaplan served (i) as a
Managing Director -- International at NETCOM On-Line Communication Services,
Inc., an ISP and Web hosting company, from August 1995, (ii) as Executive Vice
President from February 1994, (iii) as Secretary from October 1994, and (iv) as
a Director since April 1994. Mr. Kaplan also served as NETCOM's Chief Financial
Officer from February 1994 through September 1995. From September 1989 to
December 1993, Mr. Kaplan was Vice President of Operations of Gefinor (USA)
Inc., a merchant banking business, and also served as Senior Vice President and
Chief Financial Officer and Interim Chief Executive Officer of its
majority-owned subsidiary, Sheaffer Pen Company, from September 1989 to August
1991 and September 1989 to August 1990, respectively. Mr. Kaplan received a B.S.
in Accounting from New York University and an M.B.A. in Taxation from Long
Island University.
 
Mr. Rand has served as Chief Technology Officer since March 1996, initially as a
consultant, and since May 1998 as an employee. Mr. Rand has served as a member
of the Internet Engineering Task Force for the past seven years. Mr. Rand
authored rfc 1962 and rfc 1663, developed the EtherValve technology and
developed ASAP and APS, as well as co-developed MRTG. From September 1995 to May
1998, Mr. Rand was an engineer at Cisco Systems, Inc., a router manufacturer.
From February 1994 to August 1995, Mr. Rand was an engineer at Innovative
Systems and Technologies, a video compression company. From October 1993 to
February 1994, Mr. Rand was a software engineer at Novell, Inc., a network
server company.
 
Mr. Belomy has served as Executive Vice President since January 1998. Mr. Belomy
also served as AboveNet's Chief Financial Officer from January 1998 to November
1998, and as AboveNet's Director of Operations from January 1997 to January
1998. From August 1985 to December 1996, Mr. Belomy served as Vice President of
Kimball Small Properties, a commercial real estate developer in San Jose,
California. Mr. Belomy has a B.S. in Engineering from the University of
California at Los Angeles.
 
Mr. Dembitz has served as Senior Vice President of Sales and Marketing since
April 1998. From February 1996 to April 1997, Mr. Dembitz was Vice President of
Sales and Marketing of ISDNet, a start-up company that provided remote access
solutions, which was acquired in 1997. From June 1993 to December 1995, Mr.
Dembitz was an independent consultant providing networking consulting services.
From January 1990 to June 1993, Mr. Dembitz held various sales positions,
including Senior Manager of Major Account Programs and Channel Programs, as well
as the Senior Manager of Sales Operations for SynOptics Communications, which
was acquired by Bay Networks, a provider of routers, switches and hubs. Mr.
Dembitz received a B.S. in Management and a B.S. in Economics, as well as an
M.B.A. with a minor in Marketing, from the University of Utah.
 
Mr. Larson has served as Senior Vice President and Chief Financial Officer since
November 1998. From December 1997 to November 1998, Mr. Larson served as Vice
President and Treasurer of Silicon Valley Group, Inc., which designs,
manufactures and markets semiconductor processing equipment. From August 1993 to
December 1997, Mr. Larson served as Silicon Valley Group's Director of Planning
and from July 1991 to August 1993, Mr. Larson served as Silicon Valley Group's
Corporate Controller. Mr. Larson received a B.S. with honors (with a
concentration in Accounting) from California Polytechnic State University, San
Luis Obispo. Mr. Larson is a Certified Public Accountant.
 
Mr. Chen has served as Vice President of International -- Asia since October
1998. Previously, Mr. Chen served as Sales and Marketing Manager from January to
December 1996, as Senior Customer Service Manager from January to December 1997,
as San Jose Operations Director from January 1998 to June
                                       52
<PAGE>   53
 
1998 and as a Director of Asia Pacific from July 1998 to October 1998. Prior to
joining AboveNet, Mr. Chen was a Director of Postable Systems for Everex
Systems, Inc., a computer manufacturer, from January 1995 to January 1996 and
the Co-founder and Vice President of Intelligent Notebook Systems, a computer
reseller, from May 1994 to January 1996. From July 1991 to May 1994, Mr. Chen
was a sales manager for Santron Inc., a computer reseller. Mr. Chen received a
B.S. in Electrical Engineering from Feng-Chia University in Taiwan, and an
M.B.A. from the University of Hartford.
 
Mr. Freedman has served as Vice President of Engineering since February 1999.
From August 1992 until he joined AboveNet, Mr. Freedman was the founder and
served as the Chief Executive Officer, Chief Financial Officer and Chief
Technology Officer of Net Access, an Internet service provider. Mr. Freedman has
served as a board member of the Internet Service Provider Consortium since 1996.
Mr. Freedman has completed studies towards a B.S. in Computer Science at Temple
University in Philadelphia, Pennsylvania, as well as Ph.D. courses at the State
University of New York in Stony Brook, New York.
 
Mr. Hourigan was promoted to Vice President of Finance in August 1998, and has
served as Controller since February 1998. Mr. Hourigan served as a consulting
associate with Deloitte & Touche LLP from October 1997 to February 1998. From
August 1993 to April 1997, Mr. Hourigan worked for NETCOM, serving in the
positions of Controller and Director of Internal Audit, Budgeting and Analysis.
From August 1991 to August 1993, Mr. Hourigan served as Financial Analyst for
Hewlett-Packard Company, a computer manufacturer. Mr. Hourigan received a B.A.
in Business Economics and a B.A. in Law & Society from University of California,
Santa Barbara and an M.B.A. from Santa Clara University.
 
Mr. Jepson has served as Vice President of Marketing since December 1998. From
1997 until he joined AboveNet, Mr. Jepson served as the Director of Worldwide
Field Marketing and, prior to that, the Business Development Manager for
Marimba, Inc. From 1990 to 1997, Mr. Jepson worked for Sun Microsystems, Inc.,
serving in the positions of Director of Worldwide Industry Marketing, Director
of Worldwide Manufacturing Industry Marketing and Director of Worldwide Higher
Education Marketing. Mr. Jepson received his B.S. in Electrical Engineering from
the University of California at Davis.
 
Mr. Kaleem has served as Vice President of Sales since January 1999. From
September 1998 to December 1998, Mr. Kaleem served as Managing Director of
National Accounts. From December 1997 to August 1998, Mr. Kaleem was the
proprietor of Unetix International. From June 1996 to October 1997, Mr. Kaleem
was the Vice President, Corporate Development and Strategic Planning of
InfoSpace, Inc. and, from 1992 to November 1995, he was the President of
ComTrade, Inc.
 
Mr. Monroe has served as Vice President of Construction and Real Estate since
August 1998. Mr. Monroe was a Project Manager for Cupertino Electric, an
electrical contractor, from February 1998 to August 1998. Prior to that, Mr.
Monroe was a Project Manager from April 1992 to January 1998, an Assistant
Manager from 1990 to 1992 and an Estimator from 1989 to 1990 for Truland Systems
Corporation, an electrical engineering and contracting company. Mr. Monroe
completed a four year IBEN Electrical apprenticeship program and is a licensed
electrician in the State of Virginia and Washington, D.C.
 
Mr. Sanders has served as Vice President of Corporate Development since August
1998. Mr. Sanders served as AboveNet's Director of Sales from May 1996 to August
1998. From April 1994 to April 1996, Mr. Sanders was the Director of Sales for
InterNex Communications, Inc., an Internet infrastructure provider. Prior
thereto, Mr. Sanders was the Founder of InterSell, a computer peripheral
manufacturer and distribution company, which subsequently was split into three
companies, from July 1976 to January 1993. The three companies were: Integrated
Marketing, a manufacturing representative firm where he held the position of
Chief Executive Officer and President; Paragon Sales, a distributor of computer
peripherals where he held the position of Chief Executive Officer; and Intek
Manufacturing, a manufacturer of intelligent printers and smart switch boxes
where he held the position of Chief Executive Officer. Mr. Sanders attended
Olympic College in Bremerton, Washington.
 
Dr. Steiner has served as Vice President of International -- Europe since August
1998. From August 1995 until August 1998, Dr. Steiner was the Managing Director
of Europe, Africa, Middle East and India, and from February 1995 until August
1995, Dr. Steiner was a consultant for NETCOM. From January 1994 to
 
                                       53
<PAGE>   54
 
January 1995, Dr. Steiner was an independent consultant in Palo Alto,
California. From April 1986 to December 1993, Dr. Steiner served as a Managing
Director and Partner for HOT Engineering Ltd., a petroleum engineering software
and consulting company in Leoben, Austria. Dr. Steiner received a B.S. and M.S.
in Petroleum Engineering, and a Ph.D. in Reservoir Engineering from Leoben
Mining University in Leoben, Austria, and an M.B.A. from the University of
Michigan.
 
Dr. Burgelman has served as a Director since November 1998. Dr. Burgelman is
currently the Edmond W. Littlefield Professor of Management and Director of the
Stanford Executive Program at Stanford Business School and has been a professor
at Stanford Business School since August 1981. From 1991 to 1992, Dr. Burgelman
also served as Chair of the Division of Business Policy and Strategy of the
Academy of Management and was a Marvin Bower Fellow at Harvard Business School.
From 1996 to 1997 and 1988 to 1989, Dr. Burgelman was a GSB Trust Faculty Fellow
and a BP America Faculty Fellow at Stanford Business School. Dr. Burgelman
earned a Licenciate degree in Applied Economics from Antwerp University in
Belgium, an M.A. in Sociology and a Ph.D. in Management of Organizations from
Columbia University.
 
Mr. Kline has served as a Director since August 1998. Mr. Kline has served as a
Managing Partner of Kline Hawkes California, L.P./Kline Hawkes California SBIC,
L.P., a private equity firm, since 1994. From June 1984 to June 1994, Mr. Kline
served as a private equity manager of Lambda Fund Management, Inc., a venture
capital firm. Mr. Kline currently serves as a director of four companies:
CampusLink Communications Systems, Inc., EOS Corporation, SuperShuttle
International, Inc. and TranSoft Networks, Inc. Mr. Kline also serves on the
Board of Governors of the National Association of Small Business Investment
Companies. Mr. Kline received a B.S. in Commerce from Rider College and an M.S.
from the University of Massachusetts at Amherst.
 
Mr. Sha has served as a Director since August 1998. Since January 1998, Mr. Sha
has served as Senior Vice President, Commerce Solutions at Netscape
Communications, a provider of software and Internet services for businesses.
From April 1996 to December 1997, Mr. Sha was the President and Chief Executive
Officer of Actra Business Systems, a developer of high-end Internet commerce
applications. Actra, a joint venture between Netscape and GE Information
Services, was acquired by Netscape in December 1997. Mr. Sha served as Vice
President and General Manager of integrated application at Netscape from August
1994 to April 1996. From June 1990 to August 1994, Mr. Sha was the Vice
President of the Unix Product Division at Oracle Corporation, a software
company. Mr. Sha received an M.S. Electrical Engineering from the University of
California at Berkeley, an M.B.A. from Santa Clara University and a B.S. in
Electrical Engineering from Taiwan University.
 
Dr. Shao has served as Director since January 1998. Since September 1997, Dr.
Shao has served as Managing Director of Technology Associates Management Co.,
Ltd., a venture fund manager. Dr. Shao served as a senior consultant for
Technology Associates Corporation of Taiwan, a venture investment firm, from
September 1995 to September 1997. From September 1985 to September 1995, Dr.
Shao served as Senior Vice President of DynaTech Development Corporation, a
management consulting and venture investment firm. Since August 1992, Dr. Shao
has served as President of TSS Enterprises, a privately held high technology
management consulting, investing and trading company. Dr. Shao received a Ph.D.
in Applied Mathematics/Computer Science, a M.S. in Engineering from the
University of Illinois, and a B.S. in Engineering from National Taiwan
University.
 
Mr. Small has served as Director since March 1997. Mr. Small is the Founder and
President of Kimball Small Properties, a San Jose, California commercial real
estate development company incorporated in 1978. Mr. Small received a B.S. from
the University of California at Los Angeles.
 
Mr. Vierra has served as Director since October 1998. Mr. Vierra is the Vice
Chairman of the Board of Directors and a consultant to Tele-Communications
International, Inc. (TINTA), a cable television and telecommunications company.
Prior to his current position with TINTA, Mr. Vierra served as the Chief
Executive Officer from June 1995 to January 1998 and as Executive Vice President
from December 1991 to June 1995. Prior to joining TINTA, Mr. Vierra was
President and Chief Operating Officer of the
 
                                       54
<PAGE>   55
 
United Artists Entertainment Company, a cable television and motion picture
theatre company, from 1989 to 1991. Mr. Vierra received a B.S. in Business
Administration from the University of Tulsa.
 
 Classified Board
 
Our certificate of incorporation provides for a classified board of directors
consisting of three classes of directors, each serving staggered three-year
terms. As a result, a portion of our board of directors is elected each year. To
implement the classified structure, prior to the consummation of the offering,
two of the nominees to the board of directors were elected to one-year terms,
two were elected to two-year terms, and three were elected to three-year terms.
Thereafter, directors will be elected for three-year terms. Robert A. Burgelman,
Frank R. Kline and Tom Shao have been designated Class I directors whose term
expires at the 1999 annual meeting of stockholders. Peter C. Chen, Warren J.
Kaplan and Fred A. Vierra have been designated Class II directors whose term
expires at the 2000 annual meeting of stockholders. James Sha, Kimball W. Small
and Sherman Tuan have been designated Class III directors whose term expires at
the 2001 annual meeting of stockholders. See "Description of Capital
Stock -- Antitakeover Effects of Provisions of Certificate of Incorporation,
Bylaws and Delaware Law."
 
Executive officers are appointed by the board of directors on an annual basis
and serve until their successors have been duly elected and qualified.
 
BOARD COMMITTEES
 
Our board of directors has a compensation committee and an audit committee.
 
 Compensation Committee
 
The compensation committee of the board reviews and makes recommendations to our
board regarding all forms of compensation provided to our executive officers and
directors including stock compensation and loans. In addition, the compensation
committee reviews and makes recommendations on bonus and stock compensation
arrangements for all our employees. The compensation committee also administers
our 1996 and 1997 Stock Option Plans, 1998 Stock Incentive Plan and 1998
Employee Stock Purchase Plan. The current members of the compensation committee
are Messrs. Burgelman, Sha and Vierra.
 
 Audit Committee
 
The audit committee reviews and monitors the corporate financial reporting and
our internal and external audits, including, among other things, our internal
audit and control functions, the results and scope of the annual audit and other
services provided by our independent auditors and our compliance with legal
matters that have a significant impact on our financial reports. The audit
committee also consults with our management and our independent auditors prior
to the presentation of financial statements to stockholders and, as appropriate,
initiates inquiries into aspects of our financial affairs. In addition, the
audit committee has the responsibility to consider and recommend the appointment
of, and to review fee arrangements with, our independent auditors. The current
members of the audit committee are Messrs. Chen, Kline, Shao and Small.
 
DIRECTOR COMPENSATION AND OTHER ARRANGEMENTS
 
Our directors who are not employees receive cash payments of $2,000 per board
meeting and committee meeting. From time to time, certain directors who are
non-employees have received grants of options to purchase shares of our common
stock. Directors receive automatic option grants under our 1998 Stock Incentive
Plan. See "-- Stock Incentive Plan."
 
                                       55
<PAGE>   56
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
The compensation committee currently consists of Messrs. Burgelman, Sha and
Vierra. No interlocking relationship exists between any member of our board or
our compensation committee and any member of the board of directors or
compensation committee of any other company, and no such interlocking
relationship has existed in the past.
 
ADVISORY BOARD
 
We have an advisory board whose members advise our management with respect to
strategic issues and other business matters. Our advisory board currently
consists of the following persons:
 
Robert Berger is President of Internet Bandwidth Development, an Internet
infrastructure and service consultancy. Mr. Berger founded InterNex Information
Services, Inc. in 1993 and held various executive management positions through
1996 and served as a board member until the company was sold to Concentric
Network in March 1997.
 
Dr. Gregg Carse is the founder and Chief Executive Officer of CWA Communications
Products Inc., a designer of systems for telecommunications products both
domestically and internationally for over 20 years.
 
Michael Conley is General Manager of Perspecta, Inc. Prior to that, he served as
a Managing Director of Spyglass Incorporated. Mr. Conley has had various
positions with NetFrame Systems Incorporated from 1989 to 1996 with the most
recent being Vice President and General Manager, Asia Pacific.
 
Daniel Gatti has been President and Chief Executive Officer of Mayan Networks, a
multiservice carrier class access switch company, since June 1998. Prior to
joining Mayan Networks, Mr. Gatti served as Vice President and General Manager
of 3Com Corporation's Network Service Provider Division.
 
Glenn Kohner is President of ISO-Online Inc. Prior to 1996, Mr. Kohner was a
consultant and business owner.
 
James Lee is Director of Strategy at the Singapore National Information
Technology Research Institute, Kent Ridge Digital Labs.
 
Frank McGrath retired on March 1, 1999. Prior to that time he served as Vice
President of MCI WorldCom, Inc. since 1988. From 1980 to 1988, Mr. McGrath was
Vice President of ITT World Communications.
 
Richard Steranka has held several positions at Cisco Systems, Inc. since 1992.
Mr. Steranka is presently Director, Small-Medium Business Channel Marketing.
 
Bruce Weber has been President of QMS Quality Management Systems, Inc. since
1995 and a Managing Director of Boca Corporate Resources, a successor of Martin,
Randolph and Barnes since 1992, a firm specializing in corporate acquisitions,
restructuring and leveraged buyouts.
 
                                       56
<PAGE>   57
 
EXECUTIVE COMPENSATION
 
The following table sets forth the compensation earned during the fiscal year
ended June 30, 1998, by our Chief Executive Officer and our three other most
highly compensated executive officers for services rendered in all capacities
for that fiscal year.
 
SUMMARY COMPENSATION TABLE FOR LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                             LONG TERM
                                                                        COMPENSATION AWARDS
                                                                        -------------------
                                               ANNUAL COMPENSATION          SECURITIES
                                             -----------------------        UNDERLYING
        NAME AND PRINCIPAL POSITION          SALARY($)      BONUS($)        OPTIONS(#)
        ---------------------------          ---------      --------    -------------------
<S>                                          <C>            <C>         <C>
Sherman Tuan
  Chief Executive Officer..................   132,500(1)      --(2)            67,500(3)
Warren J. Kaplan
  President, Chief Operating Officer.......    71,635(4)      --(5)           202,500(6)
Stephen P. Belomy
  Executive Vice President.................   112,500(7)      --               42,500(8)
David Rand
  Chief Technology Officer.................   103,333(9)(10)  --               30,000(11)
</TABLE>
 
- -------------------------
(1) Mr. Tuan's annual base salary is currently $225,000 with a minimum annual
    increase of 10% each year. See "-- Employment Agreements."
 
(2) Mr. Tuan will receive a minimum annual bonus of $50,000 per year with a
    minimum bonus increase of 10% each year. However, this bonus will not exceed
    the amount of Mr. Tuan's then current salary. See "-- Employment
    Agreements."
 
(3) On August 18, 1998, Mr. Tuan received an option to purchase 131,500 shares
    of common stock at an exercise price of $12.00 per share. This option will
    vest in equal installments over 48 months. On December 1, 1998, our board of
    directors approved an amendment to reduce the exercise price of the option
    to $10.00 per share. On April 6, our board of directors approved a
    correction to change the vesting schedule as follows: 20% of the option
    shares are fully vested and the balance becomes vested over the next 36
    months of service measured from August 18, 1998. See "Certain Transactions."
    On December 18, 1998 Mr. Tuan received an option to purchase 2,500 shares at
    an exercise price of $12.125 per share. The option shares were fully vested
    on the date of grant.
 
(4) Mr. Kaplan's annual base salary is currently $225,000 with a minimum annual
    increase of 10% each year. See "-- Employment Agreements."
 
(5) Mr. Kaplan will receive a minimum annual bonus of $50,000 per year with a
    minimum annual bonus increase of 10% each year. However, this bonus will not
    exceed the amount of Mr. Kaplan's then current salary. See "-- Employment
    Agreements."
 
(6) On December 18, 1998 Mr. Kaplan received an option to purchase 2,500 shares
    at an exercise price of $12.125 per share. The option shares were fully
    vested on the date of grant.
 
(7) Mr. Belomy's annual base salary is currently $160,000.
 
(8) On December 18, 1998 Mr. Belomy received an option to purchase 2,500 shares
    at an exercise price of $12.125 per share. The option shares were fully
    vested on the date of grant.
 
(9) Mr. Rand's employment started on May 1, 1998 at an annual salary of
    $140,000. Mr. Rand's annual base salary is currently $190,000.
 
(10) Includes $80,000 earned as a consultant.
 
(11) On August 18, 1998, Mr. Rand received an option to purchase 101,250 shares
     of common stock at an exercise price of $12.00 per share. On December 1,
     1998, our board of directors approved an amendment to reduce the exercise
     price of the option to $10.00 per share. On April 6, our board of directors
     approved a correction to change the vesting schedule as follows: 20% of the
     option shares are fully vested and the balance becomes vested over the next
     36 months of service measured from August 18, 1998. See "Certain
     Transactions." On December 18, 1998 Mr. Rand received an option to purchase
     2,500 shares at an exercise price of $12.125 per share. The option shares
     were fully vested on the date of grant. On March 21, 1999, Mr. Rand
     received an option to purchase an additional 25,000 shares of common stock.
     The option shares were fully vested on the date of grant. On March 21, 1999
     Mr. Rand received an option to purchase 25,000 shares of common stock. This
     option will vest in equal installments over 36 months.
 
                                       57
<PAGE>   58
 
OPTION GRANTS IN LAST FISCAL YEAR
 
The following table sets forth each grant of stock options during the fiscal
year ended June 30, 1998 to our Chief Executive Officer and our three other most
highly compensated executive officers. No stock appreciation rights were granted
during the last fiscal year.
 
The assumed 5% and 10% rates of stock price appreciation are provided in
accordance with rules of the Securities and Exchange Commission and do not
represent our estimate or projection of our common stock price. Actual gains, if
any, on stock option exercises are dependent on the future performance of our
common stock, overall market conditions and the option holders' continued
employment through the vesting period. Unless the market price of our common
stock appreciates over the option term, no value will be realized from the
option grants made to these executive officers. The potential realizable values
shown in the table are calculated by assuming that the estimated fair market
value of our common stock on the date of grant increases by 5% and 10%,
respectively, during each year of the option term. See footnote 7 for
information on how the fair market value was estimated.
 
<TABLE>
<CAPTION>
                                                                                      POTENTIAL REALIZABLE
                                            INDIVIDUAL GRANTS                               VALUE AT
                       -----------------------------------------------------------       ASSUMED ANNUAL
                       NUMBER OF       PERCENT OF                                     RATES OF STOCK PRICE
                       SECURITIES         TOTAL                                         APPRECIATION FOR
                       UNDERLYING    OPTIONS GRANTED    EXERCISE OR                      OPTION TERM($)
                        OPTIONS      TO EMPLOYEES IN     BASE PRICE     EXPIRATION    ---------------------
        NAME           GRANTED(#)    FISCAL YEAR(6)     ($/SHARE)(7)     DATE(8)         5%          10%
        ----           ----------    ---------------    ------------    ----------    --------    ---------
<S>                    <C>           <C>                <C>             <C>           <C>         <C>
Sherman Tuan.........   62,500(1)         11.18             0.40         12/09/07      15,722       39,844
                         5,000(2)             *             1.20          1/26/08       3,773        9,562
Warren J. Kaplan.....   27,500(3)          4.92             0.20         11/09/07       3,459        8,766
                       175,000(4)         31.30             0.40         11/09/07      44,023      111,562
Stephen P. Belomy....   37,500(5)          6.71             0.40         12/09/07       9,433       23,906
                         5,000(2)             *             1.20          1/26/08       3,773        9,562
David Rand...........   25,000(5)          4.47             0.40         12/09/07       6,289       15,937
                         5,000(2)             *             1.20          1/26/08       3,773        9,562
</TABLE>
 
- -------------------------
 *  Less than one percent.
 
(1) 6.25% of the shares vest every 3 months after the vesting commencement date
    until the first anniversary of the vesting commencement date. 1/36 of the
    remaining shares vest each month thereafter. Under the terms of Mr. Tuan's
    employment agreement, all of the shares subject to this option will
    accelerate and become fully vested if either Mr. Tuan's employment with us
    is terminated without cause or there is a material breach by us of his
    employment agreement. See "-- Employment Agreements."
 
(2) Each of the options granted to Messrs. Tuan, Belomy and Rand on January 27,
    1998 were fully vested at the time of grant.
 
(3) 1/3 of the shares vested on December 10, 1997, 1/3 of the shares vested on
    January 10, 1998 and 1/3 of the shares vested on February 9, 1998. 9,166 of
    the option shares were cancelled when Mr. Kaplan joined us as President and
    Chief Operating Officer.
 
(4) 1/5 of the shares were immediately exercisable on the date of grant and
    1/36 of the remaining shares become exercisable each month thereafter. All
    unvested options accelerated upon the closing of our initial public offering
    on December 10, 1998.
 
(5) 6.25% of the shares vest every 3 months after the vesting commencement date
    until the first anniversary of the vesting commencement date. 1/36 of the
    remaining shares vest each month thereafter.
 
(6) Based on an aggregate of 559,125 options granted to our employees under our
    1997 Stock Option Plan and the option granted to Mr. Kaplan on November 10,
    1997 with an exercise price of $0.40 per share. See "-- Employment
    Agreements."
 
(7) The exercise price is equal to the deemed fair market value of our common
    stock as estimated by our board of directors on the date of grant. However,
    the exercise price of the option granted to Mr. Kaplan on November 10, 1997
    to purchase 175,000 shares of common stock at an exercise price of $0.40 per
    share was deemed to be above the fair market value on the date of grant. The
    fair market value of our common stock was estimated by our board of
    directors on the basis of the purchase price paid by investors for shares of
    our preferred stock, taking into account the liquidation preferences and
    other rights, privileges and preferences associated with such preferred
    stock, and an evaluation by our board of directors of our revenues,
    operating history and prospects.
                                       58
<PAGE>   59
 
(8) Each of the options has a ten-year term. However, the options will terminate
    earlier if the optionee ceases service with us.
 
AGGREGATE OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION VALUES
 
The following table sets forth information concerning the options exercised by
our Chief Executive Officer and our three other most highly compensated
executive officers in fiscal year 1998 and the year-end number and value of
unexercised options with respect to each of these executive officers. No stock
appreciation rights were exercised by these executive officers in fiscal year
1998 or were outstanding at the end of that year.
 
<TABLE>
<CAPTION>
                                                             NUMBER OF SECURITIES           VALUE OF UNEXERCISED
                                                        UNDERLYING UNEXERCISED OPTIONS      IN-THE-MONEY OPTIONS
                           SHARES                           AT FISCAL YEAR-END(#)         AT FISCAL YEAR-END($)(3)
                         ACQUIRED ON       VALUE        ------------------------------   ---------------------------
         NAME            EXERCISE(#)   REALIZED($)(1)   EXERCISABLE(2)   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
         ----            -----------   --------------   --------------   -------------   -----------   -------------
<S>                      <C>           <C>              <C>              <C>             <C>           <C>
Sherman Tuan...........        --              --          155,000           87,500        771,500        451,500
Warren J. Kaplan.......    65,833          64,833           14,721          112,777         70,661        541,330
Stephen P. Belomy......     7,551          37,708           55,781               --        268,124             --
David Rand.............        --              --           86,250           62,500        427,250        317,500
</TABLE>
 
- -------------------------
(1) Based on the fair market value of our common stock on the date of exercise,
    less the exercise price payable for such shares.
 
(2) Certain of the options are then immediately exercisable for all the option
    shares as of the date of grant but any shares purchased are subject to
    repurchase by us at the original exercise price paid per share if the
    optionee ceases service with us before vesting in such shares.
 
(3) Based on the fair market value of our common stock at fiscal year end of
    $5.20 per share less the exercise price payable for such shares. The fair
    market value of our common stock at the end of fiscal year 1998 was
    estimated by our board of directors on the basis of the purchase price paid
    by investors for shares of our preferred stock, taking into account the
    liquidation preferences and other rights, privileges and preferences
    associated with such preferred stock, and an evaluation by our board of
    directors of our revenues, operating history and prospects.
 
STOCK INCENTIVE PLAN
 
In August 1998, our board of directors adopted our 1998 Stock Incentive Plan. It
replaces our 1996 Stock Option Plan and our 1997 Stock Plan. The 1996 Stock
Option Plan and 1997 Stock Plan terminated when we adopted the 1998 Stock
Incentive Plan. No further grants will be made under the 1996 Stock Option Plan
and 1997 Stock Plan, although they will continue to govern all outstanding
awards made under their terms. All awards will be made under the 1998 Stock
Incentive Plan.
 
We reserved 1,562,500 shares of common stock for issuance under the 1998 Stock
Incentive Plan. If we forfeit or terminate any options granted under the 1998
Stock Incentive Plan for any reason without the grants having been exercised in
full, then the unpurchased shares subject to those options will become available
for additional grants of stock options or shares under the 1998 Stock Incentive
Plan. If we forfeit any shares granted or purchased under the 1998 Stock
Incentive Plan, then those shares will also become available for additional
grants under the 1998 Stock Incentive Plan. The number of shares reserved for
issuance under the 1998 Stock Incentive Plan will increase automatically on July
1 of each year by a number equal to the lesser of (1) 312,500 shares or (2) 4%
of the shares of common stock outstanding at that time. Options granted to any
optionee in a single fiscal year shall not cover more than 312,500 shares.
However, options granted to a new employee in the fiscal year in which his or
her service as an employee first commences shall not cover more than 625,000
shares.
 
Under the 1998 Stock Incentive Plan, directors, employees, and consultants and
advisors to us, or a subsidiary or affiliate of us, are eligible to purchase
shares of common stock and to receive awards of shares or grants of nonstatutory
options. Employees are also eligible to receive grants of incentive stock
options intended to qualify under Section 422 of the Internal Revenue Code of
1986, as amended. Collectively, these grants are known as awards. Our
compensation committee of our board of directors administers the 1998 Stock
Incentive Plan and selects the persons to whom shares will be sold or awarded or
options will be granted, determines the type, number, vesting requirements and
other features and conditions of each sale, award or grant, interprets this plan
and makes all other decisions relating to the operation of the plan.
 
                                       59
<PAGE>   60
 
The exercise price under any nonstatutory stock options generally must be at
least 85% of the fair market value of the common stock on the date of grant, and
the exercise price may vary in accordance with a predetermined formula while the
nonstatutory stock option is outstanding. The exercise price under incentive
stock options cannot be lower than 100% of fair market value of the common stock
on the date of grant and, in the case of incentive stock options granted to
holders of more than 10% of our voting power, not less than 110% of such fair
market value. The term of an incentive stock option cannot exceed 10 years, and
the term of an incentive stock option granted to a holder of more than 10% of
our voting power cannot exceed five years.
 
The exercise price of common stock issued upon exercise of options is payable in
cash equivalents at the time when such shares are purchased. However, the stock
option agreement for an incentive stock option, and with respect to nonstatutory
stock option, the compensation committee at any time, may specify that payment
may be made in any of the following forms: (1) by surrendering, or attesting to
the ownership of, shares of common stock that are already owned by the optionee;
(2) by delivering an irrevocable direction to a securities broker approved by us
to sell all or part of the shares being purchased under the 1998 Stock Incentive
Plan and to deliver all or part of the sales proceeds to us; (3) by delivering
an irrevocable direction to pledge all or part of the shares being purchased
under the 1998 Stock Incentive Plan to a securities broker or lender approved by
us, as security for a loan, and to deliver all or part of the loan proceeds to
us; (4) by delivering a full-recourse promissory note; or (5) any other form
that is consistent with applicable laws, regulations and rules. The par value of
the shares being purchased under the 1998 Stock Incentive Plan, if newly issued,
must be paid in cash or cash equivalents.
 
Each new non-employee director who is elected to our board of directors will
automatically be granted as of the date of election a nonstatutory stock option
to purchase 9,375 shares of common stock at an exercise price equal to the fair
market value of the common stock on the date of grant. The shares subject to
these options will vest in 36 equal installments at monthly intervals over the
three-year period commencing on the date of grant. In addition, each
non-employee director who will continue to serve following any annual meeting of
stockholders will automatically be granted an option as of the date of such
meeting to purchase 3,125 shares of common stock at an exercise price equal to
the fair market value of the common stock on the date of grant. These options
will vest on the first anniversary of grant. These options will expire on the
earliest of (1) the 10th anniversary of grant, (2) 3 months after termination of
service for any reason other than death or total and permanent disability or (3)
12 months after termination of service due to death or disability. No director
will receive the 9,375-share grant and a 3,125-share grant in the same fiscal
year.
 
Our compensation committee may permit or require an optionee to have shares that
otherwise would be delivered to such optionee as a result of the exercise of an
option converted into amounts credited to a deferred compensation account
established for such optionee as an entry on our books. In addition to options,
shares may be sold or awarded under the 1998 Stock Incentive Plan for such
consideration as the compensation committee may determine, including, without
limitation, cash, cash equivalents, full-recourse promissory notes, past
services and future services. To the extent that an award consists of newly
issued shares, the recipient must furnish consideration with a value not less
than the par value of such shares in the form of cash, cash equivalents or past
services rendered to us or a parent or subsidiary, as the compensation committee
may determine. The holders of shares awarded under the 1998 Stock Incentive Plan
shall have the same voting, dividend and other rights as our other stockholders
except that the award agreement may require that the holders of shares invest
any cash dividends received in additional shares. These additional shares are
subject to the same conditions and restrictions as the award with respect to
which the dividends were paid.
 
Immediately before the effective date of a change in control, an award will
become fully exercisable as to all shares subject to this award, except that (1)
in the case of an incentive stock plan, the acceleration of exercisability shall
not occur without the optionee's written consent; and (2) if we and the other
party to the transaction constituting a change in control agree that such
transaction is to be treated as a "pooling of interest" for financial reporting
purposes, and if such transaction in fact is so treated, then the acceleration
of exercisability shall not occur to the extent that our independent accountants
and the other party's independent accountants separately determine in good faith
that such acceleration would preclude the use of "pooling of
                                       60
<PAGE>   61
 
interest" accounting. In addition, all options granted to non-employee directors
will become fully exercisable if the director's service terminates because of
death, total and permanent disability or retirement at or after age 70.
 
Our board of directors may amend or terminate the 1998 Stock Incentive Plan at
any time. The 1998 Stock Incentive Plan shall remain in effect until it is
terminated except that no incentive stock options shall be granted on or after
the 10th anniversary of the later of (1) the date when our board of directors
adopted the 1998 Stock Incentive Plan or (2) the date when the board adopted the
most recent increase in the number of shares of common stock available under the
1998 Stock Incentive Plan which was approved by our stockholders. Amendments may
be subject to stockholder approval to the extent required by applicable laws.
 
EMPLOYEE STOCK PURCHASE PLAN
 
In August 1998, our board of directors adopted our Employee Stock Purchase Plan
to provide our employees with an opportunity to purchase common stock through
payroll deductions. Under the Employee Stock Purchase Plan, 156,250 shares of
common stock have been reserved for issuance. As of July 1 of each year, the
number of shares reserved for issuance under the Employee Stock Purchase Plan
will increase automatically by the number of shares necessary to cause the
number of shares then available for purchase to be restored to 156,250. The
Employee Stock Purchase Plan became effective at the time of our initial public
offering. All employees whose customary employment is for more than five months
per calendar year and for more than 20 hours per week are eligible to
participate in the Employee Stock Purchase Plan.
 
Eligible employees may contribute up to 15% of their total cash compensation to
the Employee Stock Purchase Plan. Amounts withheld are applied at the end of
every six-month accumulation period to purchase shares of common stock, but not
more than 3,125 shares per accumulation period. The value of the common stock
(determined as of the beginning of the offering period) that may be purchased by
any participant in a calendar year is limited to $25,000. Participants may
withdraw their contributions at any time before stock is purchased.
 
The purchase price is equal to 85% of the lower of (1) the market price of
common stock immediately before the beginning of the applicable offering period
or (2) the market price of common stock at the time of the purchase. In general,
each offering period is 24 months long, but a new offering period begins every
six months. Thus, up to four overlapping offering periods may be in effect at
the same time. An offering period continues to apply to a participant for the
full 24 months, unless the market price of common stock is lower when a
subsequent offering period begins. In that event, the subsequent offering period
automatically becomes the applicable period for purposes of determining the
purchase price. The first accumulation and offering periods commenced on
December 10, 1998 and will end on April 30, 1999, and October 31, 2000,
respectively.
 
EMPLOYMENT AGREEMENTS
 
We entered into an employment agreement with Sherman Tuan dated as of February
1, 1998. Under this employment agreement, Mr. Tuan receives certain compensation
and benefits including, but not limited to, an annual base salary of $225,000,
bonus, and stock options. Mr. Tuan's current bonus amount is at a minimum
$50,000. The bonus cannot exceed the amount of Mr. Tuan's then current salary.
In addition, Mr. Tuan is guaranteed a minimum annual salary and bonus increase
of 10% each year. Mr. Tuan receives his base salary for twelve months and fully
vests in his option shares following either a termination without cause or a
material breach of his employment agreement by us before December 31, 1999. For
the purposes of this agreement, "cause" means (1) Mr. Tuan's conviction of,
guilty or "no contest" plea to or confession of guilt of a felony, (2) a willful
act by Mr. Tuan which constitutes gross misconduct and which is materially
injurious to us or (3) violation by Mr. Tuan of our proprietary information and
inventions agreement without our prior written consent. "Material Breach" means
(a) the failure of us to
 
                                       61
<PAGE>   62
 
pay base salary or additional compensation in accordance with his employment
agreement, (b) the assignment to Mr. Tuan without Mr. Tuan's consent of duties
substantially inconsistent with his duties as set forth in his employment
agreement, (c) the relocation of our principal offices to a geographic location
other than Northern California, or (d) a failure to reelect Mr. Tuan as a member
of the board.
 
We have entered into an employment agreement with Warren J. Kaplan dated as of
November 10, 1997. Under his employment agreement, Mr. Kaplan receives certain
compensation and benefits including, but not limited to an annual base salary of
$225,000, a bonus of at least $50,000 which does not exceed his then current
salary, and stock options. We shall continue to pay Mr. Kaplan his base salary
for twelve months following a termination without cause during the term of his
employment agreement. In addition, Mr. Kaplan is guaranteed a minimum annual
salary and bonus increase of 10% each year.
 
Under the terms of his employment agreement, Mr. Kaplan received an option to
purchase shares of our common stock. This option was initially for 175,000
shares. However, the option contained an anti-dilution clause which guaranteed
that, prior to any underwritten initial public offering of our securities, the
number of option shares granted to Mr. Kaplan would always be equal to 5% of our
outstanding common stock less 18,333 option shares. Under the terms of this
anti-dilution clause, Mr. Kaplan received an additional 264,862 option shares on
July 31, 1998, an additional 30,110 option shares on September 4, 1998 and an
additional 22,240 option shares on December 1, 1998. This option is immediately
exercisable with respect to 20% of the option shares and the balance becomes
exercisable in equal monthly installments over the next 36 months of employment
with us measured from November 10, 1997, the date of Mr. Kaplan's employment
agreement. The exercise price is $0.40 per share which was above the fair market
value of our common stock on November 10, 1997. All outstanding options are
fully vested.
 
We have entered into an employment agreement with David Rand effective as of May
1, 1998. Under his employment agreement, Mr. Rand was appointed our Chief
Technology Officer. Mr. Rand's base salary is currently $190,000. Mr. Rand
receives six months' severance if he is terminated without cause.
 
See "Risk Factors -- We may not be able to hire or retain the key employees we
need."
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
Our Restated Certificate of Incorporation limits the liability of directors to
the maximum extent not prohibited by Delaware law. Delaware law provides that a
corporation's certificate of incorporation may contain a provision eliminating
or limiting the personal liability of a director for monetary damages for breach
of their fiduciary duties as directors, except for liability for any of the
following:
 
  - for any breach of their duty of loyalty to the corporation or our
    stockholders;
 
  - for acts or omissions not in good faith or which involve intentional
    misconduct or a knowing violation of law;
 
  - for unlawful payments of dividends or unlawful stock repurchases or
    redemptions as provided in Section 174 of the Delaware General Corporation
    Law; or
 
  - for any transaction from which the director derived an improper personal
    benefit.
 
Our bylaws provide that we shall indemnify our directors, officers and employee
benefit plan fiduciaries, and may indemnify our employees and agents to the
fullest extent permitted by law. We believe that indemnification under our
bylaws covers at least negligence and gross negligence on the part of
indemnified parties. Our bylaws also permit us to advance expenses incurred by
an indemnified director or officer in connection with the defense of any action
or proceeding arising out of the director's or officer's status or service as
our director or officer upon any undertaking by the director or officer to repay
any advances if it is ultimately determined that such director or officer is not
entitled to such indemnification.
 
We have also entered into agreements to indemnify our directors and officers.
These agreements, among other things, indemnify our directors and officers for
certain expenses (including attorneys' fees and associated legal expenses),
judgments, fines and amounts paid in settlement amounts if this settlement is
approved in advance
 
                                       62
<PAGE>   63
 
by us, which approval shall not be unreasonably withheld, actually and
reasonably incurred by any person in any action, suit, proceeding or alternative
dispute resolution mechanism arising out of that person's services as our
director or officer, any subsidiary of us or any other company or enterprise to
which the person provides services at our request. We believe that those
provisions and agreements are necessary to attract and retain qualified
directors and officers.
 
                                       63
<PAGE>   64
 
                              CERTAIN TRANSACTIONS
 
Since our inception in March 1996, there has not been any transaction or series
of similar transactions to which we were or are a party in which the amount
involved exceeded or exceeds $60,000 and in which any director, executive
officer, holder of more than 5% of any class of our voting securities or any
member of the immediate family of any of the foregoing persons had or will have
a direct or indirect material interest, other than the transactions described
below.
 
EQUITY FINANCINGS
 
From inception to our initial public offering in December, 1998, we financed our
growth primarily through the sale of preferred stock, resulting in the issuance
of an aggregate of 1,025,000 shares of series A preferred stock at purchase
price of $0.40 per share; 1,631,896 shares of series B preferred stock at a
weighted-average purchase price of $1.35 per share; 2,003,000 shares of series C
preferred stock at a weighted-average purchase price of $1.93 per share; and
2,115,378 shares of series D preferred stock at a purchase price of $5.20 per
share; and 408,775 shares of series E preferred stock at a purchase price of
$10.00 per share. The purchasers of our series A preferred stock, series B
preferred stock, series C preferred stock, series D preferred stock and series E
preferred stock include the following directors, executive officers and 5% or
greater stockholders:
 
<TABLE>
<CAPTION>
                                                   NUMBER OF SHARES OF PREFERRED STOCK
                                           ----------------------------------------------------
                  NAME                     SERIES A   SERIES B   SERIES C   SERIES D   SERIES E
                  ----                     --------   --------   --------   --------   --------
<S>                                        <C>        <C>        <C>        <C>        <C>
Hui-Tzu Hu(1)............................       --    150,013    500,000    192,307         --
Kline Hawkes California SBIC,
  L.P.(1)(2).............................       --         --         --    769,230     40,000
Techgains Corp. and Technology Associates
  Management Co., Ltd.(1)(3).............       --         --    552,500    192,307         --
Primus Technology Fund(1)................       --         --         --    384,615    112,000
Peter C. Chen(1)(4)......................  275,000    171,078         --         --         --
Warren J. Kaplan(5)......................       --         --     12,500         --      2,500
Kimball Small(6).........................       --    325,000         --         --         --
Spring Creek Investments(7)..............       --         --         --     96,153         --
Jerry Chen(8)............................       --     33,750         --         --         --
</TABLE>
 
- -------------------------
(1)  Holds 5% or more of our outstanding capital stock. Includes all shares held
     by affiliated entities.
 
(2)  Frank R. Kline, a director, is a private equity manager of Kline Hawkes
     California SBIC, L.P.
 
(3)  Tom Shao, a director, is a Managing Director of Technology Associates
     Management Co., Ltd.
 
(4)  Peter C. Chen is a director.
 
(5)  Includes shares held by Mr. Kaplan and his wife. Warren J. Kaplan is
     President, Chief Operating Officer and a director.
 
(6)  Kimball Small is a director.
 
(7)  James Sha, a director, is a principal of Spring Creek Investments.
 
(8)  Jerry Chen is an executive officer.
 
CONSULTING WARRANTS
 
We issued a warrant to Primus Technology Fund, a holder of more than 5% of our
capital stock, to purchase 8,750 shares of our common stock at a per share
exercise price of $5.20 in connection with services provided by Primus in
assisting us in establishing operations in Asia.
 
In December 1996, we granted options to purchase an aggregate of 104,166 shares
of our common stock at an exercise price of $0.12 per share to Stephen Belomy,
our Executive Vice President and Secretary, and Kimball Small, a member of our
board of directors, in consideration of their real estate consulting services.
In June 1998, our Board fully accelerated the vesting of these options.
 
                                       64
<PAGE>   65
 
REAL PROPERTY AGREEMENTS
 
Kimball Small Properties co-manages the building in which our San Jose,
California office and Internet service exchange facility is located, and has an
ownership interest in the building. Kimball Small, President of Kimball Small
Properties, holds more than 5% of our capital stock and is a director.
 
We recently entered into a lease for an approximately 110,000 square foot
Internet service exchange facility in San Jose, California. Kimball Small
Properties co-manages the building in which the new facility is being developed
and has an ownership interest in the building. See "Risk Factors -- Risks
Associated with Recent and Planned Business Expansion."
 
WARRANTS
 
In connection with the exchange of outstanding notes and warrants for our series
B preferred stock, the Company issued a warrant to the Peter and Pat Chen Living
Trust, owned as community property by Peter C. Chen, a holder of more than 5% of
our capital stock and Vice Chairman of the Board of Directors, to purchase
26,972 shares of our common stock at a per share exercise price of $2.00.
 
In connection with the exchange of outstanding notes and warrants for our series
B preferred stock, we issued a warrant to Hui-Tzu Hu, a holder of more than 5%
of our capital stock, to purchase 29,375 shares of our common stock at a per
share exercise price of $2.00.
 
TECHNOLOGY AGREEMENT
 
David Rand, our Chief Technology Officer, has granted to us perpetual,
non-royalty bearing worldwide licenses to the EtherValve and MRTG technologies
and assigned the APS and ASAP technology to us pursuant to a technology
agreement dated August 18, 1998. In consideration for entering into the
agreement, Mr. Rand received options to purchase 101,250 shares of our common
stock at an exercise price of $12.00 per share. On December 1, 1998, the Board
approved an amendment to reduce the exercise price of the option to $10.00 per
share. See "-- Option Repricing." The options vest over four years.
 
SERVICE OPTIONS
 
On March 27, 1999, the board of directors granted options to each of Kimball
Small and Frank R. Kline, both of whom are our directors, for 12,500 and 15,000
shares of our common stock. The options have an exercise price of $85.06 per
share and vest in three equal annual installments and terminate in 3 years.
 
OPTION REPRICING
 
On December 1, 1998, the Board approved the amendment of all outstanding stock
options under our 1997 Stock Plan with an exercise price in excess of $10.00 per
share. As a result, all options granted in August 1998, September 1998 and
October 1998 were repriced at $10.00 per share, including the options granted to
Sherman Tuan, our Chief Executive Officer and Chairman of our Board of
Directors, on August 18, 1998 for 131,500 shares, the option granted to David
Rand, our Chief Technology Officer, on August 18, 1998 for 101,250 shares and
options granted to each of Fred A. Vierra and Robert A. Burgelman, both of whom
are directors, on October 14, 1998 and October 28, 1998, respectively, for 9,375
shares.
 
We believe that all of the transactions set forth above were made on terms no
less favorable to us than could have been obtained from unaffiliated third
parties. All future transactions, including loans between us and our officers,
directors, principal stockholders and their affiliates, will be approved by a
majority of our board, including a majority of the independent and disinterested
outside directors on the Board, and will continue to be on terms no less
favorable to us than could be obtained from unaffiliated third parties.
 
                                       65
<PAGE>   66
 
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
The following table sets forth information regarding the beneficial ownership of
common stock as of March 31, 1999, and as adjusted to reflect the sale by us of
1,300,000 shares of common stock by the following individuals or groups:
 
  - each person or entity who is known by us to own beneficially more than 5% of
    our common stock;
 
  - each director;
 
  - each of the Named Executive Officers;
 
  - all of our executive officers and directors as a group; and
 
  - all other selling stockholders.
 
Unless otherwise indicated, the address for each stockholder listed in the
following table is c/o AboveNet Communications, Inc, 50 W. San Fernando Street,
Suite #1010, San Jose, California 95113. Except as otherwise indicated, and
subject to applicable community property laws, the persons named in the table
have sole voting and investment power with respect to all shares of common stock
held by them.
 
Applicable percentage ownership in the following table is based on 13,622,599
shares of common stock outstanding as of March 31, 1999.
 
To the extent that any shares are issued upon exercise of options, warrants or
other rights to acquire capital stock that are presently outstanding or granted
in the future or reserved for future issuance under stock plans, there will be
further dilution to new public investors.
 
The numbers shown in the table below assume no exercise by the underwriters of
their over-allotment option. AboveNet has granted the underwriters an option to
purchase up to 600,000 shares, to cover over-allotments, if any.
 
<TABLE>
<CAPTION>
                                   SHARES BENEFICIALLY                SHARES BENEFICIALLY
                                          OWNED                              OWNED
                                    PRIOR TO OFFERING                    AFTER OFFERING
                                   --------------------    SHARES     --------------------
DIRECTORS AND EXECUTIVE OFFICERS    NUMBER      PERCENT    OFFERED     NUMBER      PERCENT
- --------------------------------   ---------    -------    -------    ---------    -------
<S>                                <C>          <C>        <C>        <C>          <C>
Robert A. Burgelman, Ph.D.(1)....      9,375       *          *           9,375       *
Peter C. Chen, Ph.D.(2)..........    468,900      3.4       93,780      375,120      2.3
Warren J. Kaplan(3)..............    509,006      3.6       77,000      432,006      2.6
Frank R. Kline(4)................    910,063      7.0         *         910,063      6.0
James Sha(5).....................     96,153      0.7        9,615       86,538      0.5
Tom Shao, Ph.D.(6)...............    744,807      5.5      148,961      595,846      3.7
Kimball Small(7).................    409,027      3.0       70,000      339,027      2.1
Sherman Tuan(8)..................    427,125      3.1       20,000      407,125      2.5
Fred A. Vierra(9)................      9,375       *          *           9,375       *
Stephen P. Belomy(10)............    140,833      1.0       20,000      120,833      0.7
David Rand(11)...................    228,888      1.7       40,000      188,888      1.1
All directors and officers as a
  group (21 persons)(12).........  4,213,486     28.4      508,003    3,705,483     21.1
</TABLE>
 
                                       66
<PAGE>   67
 
<TABLE>
<CAPTION>
                                   SHARES BENEFICIALLY                SHARES BENEFICIALLY
                                          OWNED                              OWNED
                                    PRIOR TO OFFERING                    AFTER OFFERING
                                   --------------------    SHARES     --------------------
DIRECTORS AND EXECUTIVE OFFICERS    NUMBER      PERCENT    OFFERED     NUMBER      PERCENT
- --------------------------------   ---------    -------    -------    ---------    -------
<S>                                <C>          <C>        <C>        <C>          <C>
GREATER THAN 1% STOCKHOLDERS
Ching-Jung Chen..................    208,000      1.5       48,000      160,000      1.0
En-Lei Tuan......................    375,000      2.8      200,000      175,000      1.1
Hui-Tzu Hu.......................    867,175      6.4      150,000      717,175      4.4
  c/o D-Link Corporation
  2F No. 233-2 Pro-Chino Road
  Tsin-Tren
  Taipei, Taiwan R.O.C
Jerry Chen(13)...................    157,185      1.2       20,000      137,185      0.8
Kline Hawkes California SBIC,
  L.P.(14).......................    910,063      7.0         *         910,063      6.0
  11726 San Vicente Blvd
  Suite 300
  Los Angeles, California 90049
North American
  Venture Fund L.P...............    242,307      1.8      121,153      121,154      0.7
  CDC North America Venture
  Management, L.D.C.
  3945 Freedom Circle
  Suite 270
  Santa Clara, California 95054
Ta-Hui Shyu......................    200,000      1.5         *         200,000      1.2
Synergy (formerly Prosperity.....    250,000      1.8       50,000      200,000      1.2
  Capital)
  c/o TC Kuo
  Sun Shining Investment Corp.,
  16th Floor
  2 Tun Hwa S. Road, Sec. 2
  Taipei, Taiwan ROC
Techgains Corp. and Technology
  Associates.....................    744,807      5.5      148,961      595,846      3.7
  Management Co., Ltd.(15)
  2378 W. 239th Street
  Torrance, California 90501
Primus Technology Fund(16).......    505,365      3.7         *         505,365      3.1
  16th Floor, 35 Sec. 3
  Min Chuan E. Road
  Taipei, Taiwan R.O.C
</TABLE>
 
- -------------------------
  *  Represents less than 1 percent.
 
 (1) Includes 9,375 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Burgelman is a director
     of AboveNet.
 
 (2) Includes all shares owned as community property with Pat Chen and all
     shares owned by the Peter Cheng-Yu and Pat Te-Hui Living Trust. Mr. Chen is
     a director of AboveNet.
 
 (3) Includes 424,424 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Includes 12,500 shares of
     common stock owned by Judith A. Kaplan, Mr. Kaplan's wife. Excludes shares
     of common stock owned by
 
                                       67
<PAGE>   68
 
     Mr. Kaplan's adult children. Mr. Kaplan is a director and an officer of
     AboveNet. In December 1998, Mr. Kaplan bought 2,000 shares of our common
     stock on the open market. In connection with this offering, Mr. Kaplan will
     disgorge his profits on the sale of 2,000 shares of common stock to us
     pursuant to Section 16(b) of the Exchange Act of 1934, as amended.
 
 (4) Includes 909,230 shares held by Kline Hawkes California SBIC, L.P. and our
     affiliates. Includes 833 shares of common stock issuable to Mr. Kline
     pursuant to options exercisable within 60 days of March 31, 1999. Mr.
     Kline, a director of AboveNet and a private equity manager of Kline Hawkes
     California L.P./Kline Hawkes California SBIC, L.P., disclaims beneficial
     ownership of such shares except to the extent of his pecuniary interest.
 
 (5) Includes 96,153 shares held by Spring Creek Investments. Mr. Sha, a
     director of AboveNet, is a principal of Spring Creek Investments.
 
 (6) Includes 744,807 shares held by Techgains Corp. and Technology Associates
     Management Co., Ltd. (collectively, "TAMC"). Mr. Shao is a Managing
     Director of TAMC. Mr. Shao, a director of AboveNet, disclaims beneficial
     ownership of such shares except to the extent of his pecuniary interest
     therein.
 
 (7) Includes 84,027 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Includes all shares held in
     community property with Martha Small. Mr. Small is a director of AboveNet.
 
 (8) Includes 245,250 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Tuan is a director and an
     officer of AboveNet.
 
 (9) Includes 9,375 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Vierra is a director of
     AboveNet.
 
(10) Includes 65,781 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Belomy is an officer of
     AboveNet.
 
(11) Includes 210,138 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Rand is an officer of
     AboveNet.
 
(12) Includes 1,231,798 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. See also footnotes 4, 6 and
     8.
 
(13) Includes 27,499 shares of common stock issuable pursuant to options
     exercisable within 60 days of March 31, 1999. Mr. Chen is an officer of
     AboveNet.
 
(14) The General Partner of Kline Hawkes California SBIC, a California limited
     partnership, is Kline Hawkes California SBIC GP, a limited partnership. The
     General Partner of Kline Hawkes California SBIC GPLP is Kline Hawkes
     Management SBIC, Inc. The controlling shareholder of Kline Hawkes
     Management SBIC, Inc. is Frank R. Kline, Jr.
 
(15) Includes all shares held by TAMC. Mr. Shao is a Managing Director of TAMC.
     Mr. Shao, a director of AboveNet, disclaims beneficial ownership of such
     shares except to the extent of his pecuniary interest therein.
 
(16) Includes 8,750 shares issuable pursuant to a warrant to purchase common
     stock of AboveNet. In addition, includes all shares owned by Primus
     Holdings (BVI) Inc., an affiliated fund. The members of the Board of
     Directors of Primus Technology Fund are Kuo Yang Construction Co. Inc.,
     Thomas Chen, The Fubon Group and Tung Ho Steel Enterprise Corp.
 
                                       68
<PAGE>   69
 
                          DESCRIPTION OF CAPITAL STOCK
 
GENERAL
 
We are authorized to issue 60,000,000 shares of common stock, $0.001 par value,
and 5,000,000 shares of undesignated preferred stock, $0.001 par value. The
following description of our capital stock and certain provisions of our
certificate of incorporation and bylaws is not complete and is subject to and
qualified in its entirety by our certificate of incorporation and bylaws, which
are included as exhibits to the registration statement of which this prospectus
forms a part, and by applicable provisions of Delaware law.
 
COMMON STOCK
 
As of March 31, 1999, there were 13,622,599 shares of common stock outstanding
that were held of record by 147 stockholders. There will be 16,322,599 shares of
common stock outstanding (assuming no exercise of options and warrants
outstanding as of March 31, 1999 or granted thereafter) after giving effect to
the sale of common stock offered to the public hereby. The holders of common
stock are entitled to one vote per share held of record in all matters submitted
to a vote of stockholders. Holders of common stock do not have cumulative voting
rights, and, therefore, holders of a majority of the shares voting for the
election of directors can elect all of the directors. In such event, the holders
of the remaining shares will not be able to elect any directors.
 
Holders of the common stock are entitled to receive such dividends as may be
declared from time to time by the board of directors out of funds legally
available therefor, subject to the terms of any existing or future agreements
between us and our debtholders. We have never declared or paid cash dividends on
our capital stock, expect to retain future earnings, if any, for use in the
operation and expansion of our business, and do not anticipate paying cash
dividends in the foreseeable future. In the event of our liquidation,
dissolution or winding up, the holders of common stock are entitled to share
ratably in all assets legally available for distribution after payment of all
debts and other liabilities and subject to the prior rights of holders of
preferred stock then outstanding, if any. See -- "Dividend Policy."
 
PREFERRED STOCK
 
Our board of directors has the authority to issue the preferred stock in one or
more series and to fix the price, rights, preferences, privileges and
restrictions thereof, including dividend rights, dividend rates, conversion
rights, voting rights, terms of redemption, redemption prices, liquidation
preferences and the number of shares constituting a series or the designation of
such series, without any further vote or action by our stockholders. The
issuance of preferred stock, while providing desirable flexibility in connection
with possible acquisitions and other corporate purposes, could have the effect
of delaying, deferring or preventing a change in control of us without further
action by the stockholders and may adversely affect the market price of, and the
voting and other rights of, the holders of common stock. The issuance of
preferred stock with voting and conversion rights may adversely affect the
voting power of the holders of common stock, including the loss of voting
control to others. We have no current plans to issue any shares of preferred
stock.
 
ANTITAKEOVER EFFECTS OF PROVISIONS OF CERTIFICATE OF INCORPORATION, BYLAWS AND
DELAWARE LAW
 
Our Certificate of Incorporation provides that all stockholder actions must be
effected at a duly called annual or special meeting and may not be effected by
written consent. In addition, we have a classified board of directors such that
approximately one-third of the members of our board of directors are elected at
each annual meeting of the stockholders. Our bylaws provide that, except as
otherwise required by law, special meetings of the stockholders can only be
called pursuant to a resolution adopted by a majority of
 
                                       69
<PAGE>   70
 
the board of directors, or by our president, or by the chairman of the board or
at the request of stockholders holding at least a majority of our outstanding
stock. In addition, the bylaws establish an advance notice procedure for
stockholder proposals to be brought before an annual meeting of stockholders,
including proposed nominations of persons for election to the board.
Stockholders at an annual meeting may only consider proposals or nominations
specified in the notice of meeting or brought before the meeting by or at the
direction of the board of directors or by a stockholder who was a stockholder of
record on the record date for the meeting, who is entitled to vote at the
meeting and who has delivered timely written notice in proper form to our
Secretary of the stockholder's intention to bring such business before the
meeting. Our certificate of incorporation provides that the affirmative vote of
holders of at least a majority of the total votes eligible to be cast in the
election of directors is required to amend, alter, change or appeal certain of
its provisions. Our bylaws provide that the affirmative vote of the holders of
at least 80 percent of the Voting Stock is required to amend, alter or repeal
any of its provisions.
 
The foregoing provisions of our certificate of incorporation and bylaws are
intended to enhance the likelihood of continuity and stability in the
composition of the board of directors and in the policies formulated by the
board of directors and to discourage certain types of transactions which may
involve an actual or threatened change of control of us. These provisions are
designed to reduce the vulnerability of us to an unsolicited acquisition
proposal and, accordingly, could discourage potential acquisition proposals and
could delay or prevent a change in control of us. These provisions are also
intended to discourage certain tactics that may be used in proxy fights but
could, however, have the effect of discouraging others from making tender offers
for our shares and, consequently, may also inhibit fluctuations in the market
price of our shares that could result from actual or rumored takeover attempts.
These provisions may also have the effect of preventing changes in our
management. We are currently considering other anti-takeover measures, including
the adoption of a stockholder rights plan. See "Risk Factors -- Antitakeover
Effects of Certain Charter Provisions, Bylaws and Delaware Law."
 
EFFECT OF DELAWARE ANTITAKEOVER STATUTE
 
We are subject to Section 203 of the Delaware General Corporation Law ("Section
203") which, subject to certain exceptions, prohibits a Delaware corporation
from engaging in any business combination with any interested stockholder for a
period of three years following the date that such stockholder became an
interested stockholder, unless:
 
  - prior to such date, the board of directors of the corporation approved
    either the business combination or the transaction which resulted in the
    stockholder becoming an interested stockholder;
 
  - upon consummation of the transaction which resulted in the stockholder
    becoming an interested stockholder, the interested stockholder owned at
    least 85% of the voting stock of the corporation outstanding at the time the
    transaction commenced, excluding for purposes of determining the number of
    shares outstanding those shares owned (1) by persons who are directors and
    also officers and (2) by the employee stock plans in which employee
    participants do not have the right to determine confidentially whether
    shares held subject to the plan will be tendered in a tender or exchange
    offer; or
 
  - on or subsequent to such date, the business combination is approved by the
    board of directors and authorized at an annual or special meeting of
    stockholders, and not by written consent, by the affirmative vote of at
    least 66 2/3% of the outstanding voting stock which is not owned by the
    interested stockholder.
 
Section 203 defines a business combination to include:
 
  - any merger or consolidation involving the corporation and an interested
    stockholder;
 
  - any sale, lease, exchange, mortgage, transfer, pledge or other disposition
    of 10% or more of the assets or stock of the corporation involving an
    interested stockholder;
 
                                       70
<PAGE>   71
 
  - subject to certain exceptions, any transaction which results in the issuance
    or transfer by the corporation of any stock of the corporation to an
    interested stockholder;
 
  - any transaction involving the corporation which has the effect of increasing
    the proportionate share of the stock of any class or series, or convertible
    into the stock of any class or series, of the corporation which is owned by
    an interested stockholder; or
 
  - the receipt by an interested stockholder of the benefit of any loans,
    advances, guarantees, pledges or other financial benefits provided by or
    through the corporation. In general, Section 203 defines an interested
    stockholder as any entity or person beneficially owning 15% or more of the
    outstanding voting stock of the corporation or any entity or person
    affiliated with or controlling or controlled by such entity or person. See
    "Risk Factors -- Antitakeover Effects of Certificate of Incorporation,
    Bylaws and Delaware Law."
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
The holders of approximately 6,261,267 shares of common stock are entitled to
certain rights with respect to the registration of those shares under the
Securities Act. Under the terms of the agreement between us and the holders of
these registrable securities, if we propose to register any of our securities
under the Securities Act, either for our own account or for the account of other
securities holders exercising registration rights, such holders are entitled to
notice of such registration and are entitled to include their shares therein.
Holders of registration rights may also require us to file a registration
statement under the Securities Act at our expense with respect to their shares
of common stock, and we are required to use our best efforts to effect such
registration. Further, holders may require us to file registration statements on
Form S-3 at our expense when that form becomes available for use by us. All such
registration rights are subject to certain conditions and limitations, including
the right of the underwriters of an offering to limit the number of shares to be
included in such registration. In addition, Warren J. Kaplan, our President and
Chief Operating Officer, has the right to require us to register any shares
issued or issuable pursuant to options granted to him on Form S-8.
 
WARRANTS
 
As of March 31, 1999, warrants to purchase 170,158 shares of our common stock.
 
TRANSFER AGENT
 
The transfer agent and registrar for our common stock is Boston EquiServe L.P.
Its address is 150 Royall Street, Canton, Massachusetts, and its telephone
number at this location is (781) 575-3010.
 
                                       71
<PAGE>   72
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
Upon completion of this offering, based on shares outstanding as of March 31,
1999, we will have 16,322,597 shares of common stock outstanding, assuming no
exercise of the underwriters' over-allotment option. Of this amount, the
4,000,000 shares sold in this offering, assuming no exercise of the
underwriters' over-allotment option, will be freely tradeable without
restriction or further registration under the Securities Act of 1933, as
amended, unless the shares are purchased by our "affiliates" as that term in
Rule 144 under the Securities Act. In addition, the 5,750,000 shares sold in our
December 1998 initial public offering are currently eligible to be resold
immediately in the public market without restriction unless the shares were
purchased by affiliates. Of the remaining shares, approximately (1) 8,556,182
shares will be available for immediate sale in the public market as of the date
of this prospectus, (2) 2,712,539 shares will be available for sale on June 10,
1999, the expiration date of the contractual lock-up agreements entered into in
connection with our initial public offering, (3) 683,694 shares will be
available for sale at various times during the period beginning June 10, 1999
and ending 90 days after the date of this prospectus and (4) 4,315,265 shares
will be eligible 90 days after the date of this prospectus following the
expiration of 90-day lockup agreements entered into with the underwriters, in
some cases subject to the volume limitations described below. Shares issuable
upon exercise of outstanding options after March 31, 1999 are not included in
this analysis.
 
<TABLE>
<CAPTION>
           DAYS AFTER DATE                APPROXIMATE SHARES
         OF THIS PROSPECTUS            ELIGIBLE FOR FUTURE SALE                COMMENT
         ------------------            ------------------------                -------
<S>                                    <C>                        <C>
Upon Effectiveness...................         8,556,182           Freely tradable shares sold in our
                                                                  initial public offering or this
                                                                  offering and shares saleable under
                                                                  Rule 144(k) that are not subject
                                                                  to contractual lockup restrictions
June 10, 1999........................         2,712,539           Initial public offering lockup
                                                                  released; shares saleable under
                                                                  Rule 144, 144(k) or 701
Period between June 10, 1999 and 90             683,694           Initial public offering lockup
  days after prospectus..............                             released; shares saleable under
                                                                  Rule 144, 144(k) or 701
90 days after prospectus.............         4,315,265           90-day lockup in connection with
                                                                  this offering released; shares
                                                                  saleable under Rule 144 or 701.
</TABLE>
 
In general, under Rule 144 as currently in effect, a person (or persons whose
shares are aggregated) who has beneficially owned shares for at least one year
is entitled to sell within any three-month period a number of shares that does
not exceed the greater of (1) 1% of the then outstanding shares of common stock
(approximately 163,225 shares immediately after this offering) or (2) the
average weekly trading volume during the four calendar weeks preceding such
sale, subject to the filing of a Form 144 with respect to such sale. A person
(or persons whose shares are aggregated) who is not deemed to have been our
affiliate at any time during the 90 days immediately preceding the sale who has
beneficially owned his or her shares for at least two years is entitled to sell
those shares pursuant to Rule 144(k) without regard to the limitations described
above. Persons deemed to be affiliates must always sell pursuant to Rule 144,
even after the applicable holding periods have been satisfied.
 
AboveNet, our directors, executive officers, the selling stockholders and
certain other stockholders have agreed pursuant to the underwriting agreement
and other agreements that they will not sell any common stock without the prior
consent of CIBC Oppenheimer Corp. for a period of 90 days from the date of this
prospectus, except that we may, without such consent, grant options and sell
shares pursuant to our stock plans. We have agreed with the underwriters that we
will not release any shares subject to lock-up agreements with us without the
prior consent of CIBC Oppenheimer Corp.
                                       72
<PAGE>   73
 
We are unable to estimate the number of shares that will be sold under Rule 144,
since this will depend on the market price for our common stock, the personal
circumstances of the sellers and other factors. Any sale of substantial amounts
of the common stock in the open market may adversely affect the price of the
common stock offered hereby.
 
In addition, the holders of approximately 6,261,267 shares of common stock
entitled to certain rights with respect to registration of those shares under
the Securities Act. Registration of those shares under the Securities Act would
result in those shares becoming freely tradable without restriction under the
Securities Act (except for shares purchased by our affiliates) immediately upon
the effectiveness of that registration. See "Description of Capital
Stock -- Registration Rights."
 
                                       73
<PAGE>   74
 
                                  UNDERWRITING
 
AboveNet and the selling stockholders have entered into an underwriting
agreement with the underwriters named below. CIBC Oppenheimer Corp., Lehman
Brothers Inc., PaineWebber Incorporated and Volpe Brown Whelan & Company, LLC
are acting as representatives of the underwriters.
 
The underwriting agreement provides for the purchase of a specific number of
shares of common stock by each of the underwriters. The underwriters'
obligations are several, which means that each underwriter is required to
purchase a specified number of shares, but is not responsible for the commitment
of any other underwriter to purchase shares. Subject to the terms and conditions
of the underwriting agreement, each underwriter has severally agreed to purchase
the number of common stock set forth opposite its name below:
 
<TABLE>
<CAPTION>
                                                              NUMBER OF
                        UNDERWRITERS                           SHARES
                        ------------                          ---------
<S>                                                           <C>
CIBC Oppenheimer Corp. .....................................
Lehman Brothers Inc. .......................................
PaineWebber Incorporated....................................
Volpe Brown Whelan & Company, LLC...........................
                                                              --------
          Total.............................................  4,000,000
                                                              ========
</TABLE>
 
This is a firm commitment underwriting. This means that the underwriters have
agreed to purchase all of the shares offered by this prospectus (other than
those covered by the over-allotment option described below) if any are
purchased. Under the underwriting agreement, if an underwriter defaults in its
commitment to purchase shares, the commitments of non-defaulting underwriters
may be increased or the underwriting agreement may be terminated, depending on
the circumstances.
 
The representatives have advised AboveNet and the selling stockholders that the
underwriters propose to offer the shares directly to the public at the public
offering price that appears on the cover page of this prospectus. In addition,
the representatives may offer some of the shares to certain securities dealers
at such price less a concession of $          per share. The underwriters may
also allow, and such dealers may reallow, a concession not in excess of
$          per share to certain other dealers. After the shares are released for
sale to the public, the representatives may change the offering price and other
selling terms at various times.
 
AboveNet has granted the underwriters an over-allotment option. This option,
which is exercisable for up to 30 days after the date of this prospectus,
permits the underwriters to purchase a maximum of                additional
shares from AboveNet to cover over-allotments. If the underwriters exercise all
or part of this option, they will purchase shares covered by the option at the
public offering price that appears on the cover page of this prospectus, less
the underwriting discount. If this option is exercised in full, the total price
to public will be $          million, and the total proceeds to AboveNet will be
$          . The underwriters have severally agreed that, to the extent the
over-allotment option is exercised, they will each purchase a number of
additional shares proportionate to the underwriter's initial amount reflected in
the foregoing table.
 
                                       74
<PAGE>   75
 
The following table provides information regarding the amount of the discount to
be given to the underwriters by AboveNet and the selling stockholders.
 
<TABLE>
<CAPTION>
                                                                              TOTAL WITH FULL
                                                    TOTAL WITHOUT EXERCISE      EXERCISE OF
                    PER SHARE                         OF OVER-ALLOTMENT       OVER-ALLOTMENT
                    ---------                       ----------------------    ---------------
<S>                                                 <C>                       <C>
AboveNet..........................................          $                     $
Selling stockholders..............................
Total.............................................
</TABLE>
 
AboveNet estimates that its total expenses of the offering, excluding the
underwriting discount, will be approximately $          and $          ,
respectively.
 
AboveNet and the selling stockholders have agreed to indemnify the underwriters
against certain liabilities, including liabilities under the Securities Act of
1933.
 
AboveNet, its officers and directors, the selling stockholders and certain other
stockholders have agreed to a 90-day "lock up" with respect to approximately
               shares of common stock and certain other AboveNet securities that
they beneficially own, including securities that are convertible into shares of
common stock and securities that are exchangeable or exercisable for shares of
common stock. This means that, subject to certain exceptions, for a period of 90
days following the date of this prospectus, AboveNet and such persons may not
offer, sell, pledge or otherwise dispose of the AboveNet securities without the
prior written consent of CIBC Oppenheimer Corp.
 
Rules of the Securities and Exchange Commission may limit the ability of the
underwriters to bid for or purchase shares before the distribution of the shares
is completed. However, the underwriters may engage in the following activities
in accordance with the rules:
 
  - Stabilizing transactions -- The representatives may make bids or purchases
    for the purpose of pegging, fixing or maintaining the price of the shares,
    so long as stabilizing bids do not exceed a specified maximum.
 
  - Over-allotments and syndicate covering transactions -- The underwriters may
    create a short position in the shares by selling more shares than are set
    forth on the cover page of this prospectus. If a short position is created
    in connection with the offering, the representatives may engage in syndicate
    covering transactions by purchasing shares in the open market. The
    representatives may also elect to reduce any short position by exercising
    all or part of the over-allotment option.
 
  - Penalty bids -- If the representatives purchase shares in the open market in
    a stabilizing transaction or syndicate covering transaction, they may
    reclaim a selling concession from the underwriters and selling group members
    who sold those shares as part of this offering.
 
  - Passive market making -- Market makers in the shares who are underwriters or
    prospective underwriters may make bids for or purchases of shares, subject
    to certain limitations, until the time, if ever, at which a stabilizing bid
    is made.
 
Stabilization and syndicate covering transactions may cause the price of the
shares to be higher than it would be in the absence of such transactions. The
imposition of a penalty bid might also have an effect on the price of the shares
if it discourages resales of the shares.
 
Neither AboveNet nor the underwriters make any representation or prediction as
to the effect that the transactions described above may have on the price of the
shares. These transactions may occur on the Nasdaq National Market or otherwise.
If these transactions are commenced, they may be discontinued without notice at
any time.
 
                                       75
<PAGE>   76
 
                                 LEGAL MATTERS
 
The validity of the common stock offered hereby will be passed upon for AboveNet
by Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, Menlo Park,
California. An investment partnership comprised of members of that firm
beneficially owns a warrant to purchase 2,500 shares of our common stock at an
exercise price of $5.20 per share. Certain legal matters in connection with this
offering will be passed upon for the Underwriters by Pillsbury Madison & Sutro
LLP, Palo Alto, California. Pillsbury Madison & Sutro LLP has acted and
continues to act as counsel to us in connection with certain legal matters.
 
                                    EXPERTS
 
Our financial statements as of June 30, 1997 and 1998 and for the period from
March 8, 1996 (inception) to June 30, 1996 and each of the years in the two-year
period ended June 30, 1998 included in this Prospectus and the related financial
statement schedule included elsewhere in the Registration Statement have been
audited by Deloitte & Touche LLP, independent auditors, as stated in their
reports appearing herein and elsewhere in the Registration Statement, and have
been so included in reliance upon the reports of such firm given upon their
authority as experts in accounting and auditing.
 
                             CHANGE IN ACCOUNTANTS
 
In April 1998, we appointed Deloitte & Touche LLP to replace our former
accountants as our principal accountants. There were no disagreements with our
former accountants during the period from inception to April 30, 1998 or during
any subsequent interim period preceding their replacement on any matter of
accounting principles or practices, financial statement disclosure, or auditing
scope or procedures, which disagreements, if not resolved to the former
accountants' satisfaction, would have caused them to make reference to the
subject matter of the disagreement in connection with their reports. Our former
accountants issued an unqualified opinion on the financial statements as of and
for the year ended June 30, 1997 and the period from inception to June 30, 1997.
We did not consult with Deloitte & Touche LLP on any accounting or financial
reporting matters in the periods prior to their appointment. The change in
accountants was approved by our board of directors.
 
                             ADDITIONAL INFORMATION
 
AboveNet has filed a registration statement on Form S-1 with the Securities and
Exchange Commission in connection with this offering. We are subject to the
informational requirements of the Exchange Act and file annual, quarterly and
current reports, proxy statements and other information with the SEC. You may
read and copy the registration statement and any other documents we filed at the
SEC's Public Reference Room at the principal office of the SEC, 450 Fifth
Street, N.W., Washington, D.C. 20549 or at the Regional Offices of the SEC:
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511, and Seven World Trade Center, New York, New York 10048. Please call
the Securities and Exchange Commission at 1-800-SEC-0330 for further information
on the Public Reference Room. Our SEC filings are also available to the public
at the SEC's Internet site at "http://www.sec.gov."
 
This prospectus is a part of the registration statement and does not contain all
of the information included in the registration statement. Whenever a reference
is made in this prospectus to any contract or other document, the reference may
not be complete and you should refer to the exhibits that are part of the
registration statement for a copy of the contract or document.
 
                                       76
<PAGE>   77
 
                          ABOVENET COMMUNICATIONS INC.
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Independent Auditors' Report................................  F-2
Balance Sheets as of June 30, 1997 and 1998 and December 31,
  1998 (Unaudited)..........................................  F-3
Statements of Operations for the Period from December 31,
  1996 (Inception) to June 30, 1996, the Years Ended June
  30, 1997 and 1998 and the Six Months Ended December 31,
  1997 and 1998 (Unaudited).................................  F-4
Statements of Stockholders' Equity (Deficiency) for the
  Period from March 8, 1996 (Inception) to June 30, 1996,
  the Years Ended June 30, 1997 and 1998 and the Six Months
  Ended December 31, 1998 (Unaudited).......................  F-5
Statements of Cash Flows for the Period from March 8, 1996
  (Inception) to June 30, 1996, the Years Ended June 30,
  1997 and 1998 and the Six Months Ended December 31, 1997
  and 1998 (Unaudited)......................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>
 
                                       F-1
<PAGE>   78
 
                          INDEPENDENT AUDITORS' REPORT
 
To the Board of Directors and Stockholders of
AboveNet Communications Inc.:
 
We have audited the accompanying balance sheets of AboveNet Communications Inc.
as of June 30, 1997 and 1998, and the related statements of operations,
stockholders' equity (deficiency) and cash flows for the period from March 8,
1996 (inception) to June 30, 1996 and for each of the two years in the period
ended June 30, 1998. These financial statements are the responsibility of the
Company's management. Our responsibility is to express an opinion on these
financial statements 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, such financial statements present fairly, in all material
respects, the financial position of AboveNet Communications Inc. as of June 30,
1997 and 1998, and the results of their operations and their cash flows for the
period from March 8, 1996 (inception) to June 30, 1996 and for each of the two
years in the period ended June 30, 1998, in conformity with generally accepted
accounting principles.
 
DELOITTE & TOUCHE LLP
 
San Jose, California
August 7, 1998
(December 4, 1998 as to the first eight paragraphs
of Note 12 and March 31, 1999 as to the
last seven paragraphs of Note 12)
 
                                       F-2
<PAGE>   79
 
                          ABOVENET COMMUNICATIONS INC.
 
                                 BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                       JUNE 30,
                                                              --------------------------    DECEMBER 31,
                                                                 1997           1998            1998
                                                              -----------    -----------    ------------
                                                                                            (UNAUDITED)
<S>                                                           <C>            <C>            <C>
ASSETS
Current assets:
  Cash and equivalents......................................  $   331,100    $ 8,141,200    $ 67,903,500
  Short-term investments....................................           --             --         974,900
  Accounts receivable, net of reserve for doubtful accounts
    of $15,000, $60,000 and $257,100, respectively..........       41,100        357,000       1,471,000
  Prepaid expenses and other current assets.................           --        269,600         737,100
                                                              -----------    -----------    ------------
         Total current assets...............................      372,200      8,767,800      71,086,500
Property and equipment, net.................................      766,400      4,436,100      15,007,600
Restricted cash.............................................           --        300,000              --
Right to use fiber optic capacity...........................           --             --       8,300,000
Deposits and other assets...................................       32,700        189,400       1,337,700
                                                              -----------    -----------    ------------
         Total..............................................  $ 1,171,300    $13,693,300    $ 95,731,800
                                                              ===========    ===========    ============
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIENCY)
Current liabilities:
  Accounts payable..........................................  $   312,000    $ 2,301,300    $  2,329,600
  Remaining obligation for right to use fiber optic
    capacity................................................           --             --       6,425,000
  Accrued liabilities.......................................      109,700        619,900       1,016,500
  Customer deposits.........................................       85,000        309,400         653,800
  Advances..................................................      739,900             --              --
  Current portion of long-term obligations..................       71,500        476,000       1,937,700
                                                              -----------    -----------    ------------
         Total current liabilities..........................    1,318,100      3,706,600      12,362,600
                                                              -----------    -----------    ------------
Convertible notes payable and advances......................           --      8,000,000              --
                                                              -----------    -----------    ------------
Other long-term obligations.................................      115,500      1,325,300       6,500,100
                                                              -----------    -----------    ------------
Commitments and contingencies (Note 9) Stockholders' equity
  (deficiency):
  Preferred stock, $0.001 par value, 14,000,000 shares
    authorized:
    Series A convertible preferred stock; 1,025,000 shares
      designated, 1,025,000, 1,025,000 and none issued and
      outstanding, respectively.............................      410,000        410,000              --
    Series B convertible preferred stock; 1,775,000 shares
      designated; 1,000,000, 1,631,896 and none issued and
      outstanding, respectively.............................    1,200,000      2,323,100              --
    Series C convertible preferred stock; 2,025,000 shares
      designated; none, 2,003,000 and none issued and
      outstanding, respectively.............................           --      3,873,400              --
    Series D convertible preferred stock; 2,125,000 shares
      designated; none issued and outstanding...............           --             --              --
    Series E convertible preferred stock; 1,750,000 shares
      designated; none issued and outstanding...............           --             --              --
  Common stock, $0.001 par value, 20,000,000 shares
    authorized; 203,125, 364,348 and 13,593,942 shares
    issued and outstanding, respectively....................        8,100         38,900      89,327,100
  Common stock options......................................           --      1,861,500       3,467,400
  Deferred stock compensation...............................           --       (540,100)        (76,900)
  Accumulated deficit.......................................   (1,880,400)    (7,305,400)    (15,848,500)
                                                              -----------    -----------    ------------
         Total stockholders' equity (deficiency)............     (262,300)       661,400      76,869,100
                                                              -----------    -----------    ------------
         Total..............................................  $ 1,171,300    $13,693,300    $ 95,731,800
                                                              ===========    ===========    ============
</TABLE>
 
                       See notes to financial statements.
                                       F-3
<PAGE>   80
 
                          ABOVENET COMMUNICATIONS INC.
 
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                               MARCH 8, 1996                                   SIX MONTHS ENDED
                                (INCEPTION)       YEAR ENDED JUNE 30,            DECEMBER 31,
                                    TO         -------------------------   -------------------------
                               JUNE 30, 1996      1997          1998          1997          1998
                               -------------   -----------   -----------   -----------   -----------
                                                                                  (UNAUDITED)
<S>                            <C>             <C>           <C>           <C>           <C>
Revenues.....................    $ 78,600      $   551,600   $ 3,436,400   $ 1,105,500   $ 4,446,200
                                 --------      -----------   -----------   -----------   -----------
Costs and expenses:
  Data communications and
     telecommunications......          --          558,600     2,199,800       628,800     2,829,700
  Network operations.........      19,400          416,700     1,571,800       444,600     2,022,800
  Sales and marketing........      19,100          382,600     1,618,700       475,000     3,492,800
  General and
     administrative..........      66,100          433,700     1,621,500       475,800     2,060,800
  Depreciation and
     amortization............      51,600          132,700       475,500       181,800     1,203,300
  Stock-based compensation
     expense.................          --               --     1,276,400        49,400     1,169,600
  Joint venture termination
     fee.....................          --          431,100            --            --            --
                                 --------      -----------   -----------   -----------   -----------
          Total costs and
            expenses.........     156,200        2,355,400     8,763,700     2,255,400    12,779,000
                                 --------      -----------   -----------   -----------   -----------
Loss from operations.........     (77,600)      (1,803,800)   (5,327,300)   (1,149,900)   (8,332,800)
Interest expense.............          --           (7,400)     (160,800)     (125,800)     (493,500)
Interest and other income....          --            8,400        63,100         9,300       283,200
                                 --------      -----------   -----------   -----------   -----------
Net loss.....................    $(77,600)     $(1,802,800)  $(5,425,000)  $(1,266,400)  $(8,543,100)
                                 ========      ===========   ===========   ===========   ===========
Basic and diluted loss per
  share......................    $  (0.62)     $     (9.17)  $    (20.68)  $     (5.91)  $     (4.50)
                                 ========      ===========   ===========   ===========   ===========
Shares used in basic and
  diluted loss per share.....     125,000          196,618       262,304       214,400     1,897,000
                                 ========      ===========   ===========   ===========   ===========
</TABLE>
 
                       See notes to financial statements.
                                       F-4
<PAGE>   81
 
                          ABOVENET COMMUNICATIONS INC.
 
                STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIENCY)
<TABLE>
<CAPTION>
                                            CONVERTIBLE
                                          PREFERRED STOCK              COMMON STOCK           COMMON       DEFERRED
                                     -------------------------   ------------------------     STOCK         STOCK
                                       SHARES        AMOUNT        SHARES       AMOUNT       OPTIONS     COMPENSATION
                                     ----------   ------------   ----------   -----------   ----------   ------------
<S>                                  <C>          <C>            <C>          <C>           <C>          <C>
Balances, March 8, 1996
  (inception)......................          --   $         --           --   $        --   $       --   $        --
Issuance of common stock...........          --             --      125,000         5,000           --            --
Net loss...........................          --             --           --            --           --            --
                                     ----------   ------------   ----------   -----------   ----------   -----------
Balances, June 30, 1996............          --             --      125,000         5,000           --            --
Issuance of common stock...........          --             --       62,500         2,500           --            --
Issuance of Series A convertible
  preferred stock..................   1,025,000        410,000           --            --           --            --
Exercise of common stock options...          --             --       15,625           600           --            --
Issuance of Series B convertible
  preferred stock..................     500,000        600,000           --            --           --            --
Issuance of Series B convertible
  preferred stock in conjunction
  with acquisition of DSK, Inc.
  (Note 8).........................     500,000        600,000           --            --           --            --
Net loss...........................          --             --           --            --           --            --
                                     ----------   ------------   ----------   -----------   ----------   -----------
Balances, June 30, 1997............   2,025,000      1,610,000      203,125         8,100           --            --
Exercise of common stock options...          --             --      161,223        30,800           --            --
Issuance of warrants in connection
  with issuance of debt............          --        112,000           --            --       45,000            --
Issuance of Series B convertible
  preferred stock..................     631,896      1,011,100           --            --           --            --
Issuance of Series C convertible
  preferred stock..................   2,003,000      3,873,400           --            --           --            --
Compensatory stock arrangements....          --             --           --            --    1,816,500    (1,816,500)
Amortization of deferred stock
  compensation.....................          --             --           --            --           --     1,276,400
Net loss...........................          --             --           --            --           --            --
                                     ----------   ------------   ----------   -----------   ----------   -----------
Balances, June 30, 1998............   4,659,896      6,606,500      364,348        38,900    1,861,500      (540,100)
Issuance of Series D convertible
  preferred stock*.................   2,115,378     10,771,000           --            --           --            --
Issuance of Series E convertible
  preferred stock*.................     408,775      3,846,400           --            --           --            --
Exercise of Series B warrants*.....     104,700             --           --            --           --            --
Conversion of convertible preferred
  stock to common stock*...........  (7,288,749)   (21,223,900)   7,288,749    21,223,900           --            --
Issuance of common stock upon
  initial public offering*.........          --             --    5,750,000    67,986,900           --            --
Exercise of common stock options
  and warrants*....................          --             --      190,845        77,400           --            --
Issuance of warrants in connection
  with issuance of debt*...........          --             --           --            --      899,500            --
Compensatory stock arrangements*...          --             --           --            --      706,400      (706,400)
Amortization of deferred stock
  compensation*....................          --             --           --            --           --     1,169,600
Net loss*..........................          --             --           --            --           --            --
                                     ----------   ------------   ----------   -----------   ----------   -----------
Balances, December 31, 1998*.......          --   $         --   13,593,942   $89,327,100   $3,467,400   $   (76,900)
                                     ==========   ============   ==========   ===========   ==========   ===========
 
<CAPTION>
                                                        TOTAL
                                                    STOCKHOLDERS'
                                     ACCUMULATED       EQUITY
                                       DEFICIT      (DEFICIENCY)
                                     ------------   -------------
<S>                                  <C>            <C>
Balances, March 8, 1996
  (inception)......................  $         --    $        --
Issuance of common stock...........            --          5,000
Net loss...........................       (77,600)       (77,600)
                                     ------------    -----------
Balances, June 30, 1996............       (77,600)       (72,600)
Issuance of common stock...........            --          2,500
Issuance of Series A convertible
  preferred stock..................            --        410,000
Exercise of common stock options...            --            600
Issuance of Series B convertible
  preferred stock..................            --        600,000
Issuance of Series B convertible
  preferred stock in conjunction
  with acquisition of DSK, Inc.
  (Note 8).........................            --        600,000
Net loss...........................    (1,802,800)    (1,802,800)
                                     ------------    -----------
Balances, June 30, 1997............    (1,880,400)      (262,300)
Exercise of common stock options...            --         30,800
Issuance of warrants in connection
  with issuance of debt............            --        157,000
Issuance of Series B convertible
  preferred stock..................            --      1,011,100
Issuance of Series C convertible
  preferred stock..................            --      3,873,400
Compensatory stock arrangements....            --             --
Amortization of deferred stock
  compensation.....................            --      1,276,400
Net loss...........................    (5,425,000)    (5,425,000)
                                     ------------    -----------
Balances, June 30, 1998............    (7,305,400)       661,400
Issuance of Series D convertible
  preferred stock*.................            --     10,771,000
Issuance of Series E convertible
  preferred stock*.................            --      3,846,400
Exercise of Series B warrants*.....            --             --
Conversion of convertible preferred
  stock to common stock*...........            --             --
Issuance of common stock upon
  initial public offering*.........            --     67,986,900
Exercise of common stock options
  and warrants*....................            --         77,400
Issuance of warrants in connection
  with issuance of debt*...........            --        899,500
Compensatory stock arrangements*...            --             --
Amortization of deferred stock
  compensation*....................            --      1,169,600
Net loss*..........................    (8,543,100)    (8,543,100)
                                     ------------    -----------
Balances, December 31, 1998*.......  $(15,848,500)   $76,869,100
                                     ============    ===========
</TABLE>
 
- ---------------
* Unaudited
 
                       See notes to financial statements.
                                       F-5
<PAGE>   82
 
                          ABOVENET COMMUNICATIONS INC.
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                        MARCH 8, 1996                                   SIX MONTHS ENDED
                                                         (INCEPTION)       YEAR ENDED JUNE 30,            DECEMBER 31,
                                                             TO         -------------------------   -------------------------
                                                        JUNE 30, 1996      1997          1998          1997          1998
                                                        -------------   -----------   -----------   -----------   -----------
                                                                                                           (UNAUDITED)
<S>                                                     <C>             <C>           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss............................................    $ (77,600)    $(1,802,800)  $(5,425,000)  $(1,266,400)  $(8,543,100)
  Adjustments to reconcile net loss to net cash used
    in operating activities:
    Depreciation and amortization.....................       51,600         132,700       475,500       181,800     1,203,300
    Stock-based compensation expense..................           --              --     1,276,400        49,400     1,169,600
    Noncash interest expense..........................           --              --       133,200       112,000        22,900
    Joint venture termination fee.....................           --         431,100            --            --            --
    Changes in assets and liabilities:
      Accounts receivable.............................      (12,000)        (29,100)     (315,900)     (112,600)   (1,114,000)
      Prepaid expenses and other current assets.......           --              --      (269,600)      (21,600)     (467,500)
      Restricted cash.................................           --              --      (300,000)     (300,000)      300,000
      Deposits and other assets.......................           --         (32,700)     (111,700)      (21,000)     (271,700)
      Accounts payable................................       13,100         298,900     1,989,300        73,100        28,300
      Accrued liabilities.............................           --         109,700       510,200        92,700       396,600
      Customer deposits...............................           --          85,000       224,400        82,200       344,400
      Deferred rent...................................           --          30,400        18,200            --        78,900
                                                          ---------     -----------   -----------   -----------   -----------
        Net cash used in operating activities.........      (24,900)       (776,800)   (1,795,000)   (1,130,400)   (6,852,300)
                                                          ---------     -----------   -----------   -----------   -----------
Cash flows from investing activities:
  Cash paid for right to use fiber optic capacity.....           --              --            --            --    (1,875,000)
  Purchase of property and equipment..................     (101,100)       (474,500)   (3,666,000)     (297,900)  (11,774,800)
  Purchase of short-term investments..................           --              --            --            --      (974,900)
                                                          ---------     -----------   -----------   -----------   -----------
        Net cash used in investing activities.........     (101,100)       (474,500)   (3,666,000)     (297,900)  (14,624,700)
                                                          ---------     -----------   -----------   -----------   -----------
Cash flows from financing activities:
  Proceeds from notes payable and advances............      210,000         739,900    13,395,000     2,402,700     7,676,800
  Payments on debt....................................           --              --       (70,000)           --      (976,600)
  Principal payments on capital leases................           --         (49,600)      (84,700)      (27,800)     (142,600)
  Proceeds from issuance of common stock..............        5,000           3,100        30,800         3,600    68,064,300
  Proceeds from issuance of convertible preferred
    stock.............................................           --         800,000            --            --     6,617,400
                                                          ---------     -----------   -----------   -----------   -----------
        Net cash provided by financing activities.....      215,000       1,493,400    13,271,100     2,378,500    81,239,300
                                                          ---------     -----------   -----------   -----------   -----------
Net increase in cash and equivalents..................       89,000         242,100     7,810,100       950,200    59,762,300
Cash and equivalents, beginning of period.............           --          89,000       331,100       331,100     8,141,200
                                                          ---------     -----------   -----------   -----------   -----------
Cash and equivalents, end of period...................    $  89,000     $   331,100   $ 8,141,200   $ 1,281,300   $67,903,500
                                                          =========     ===========   ===========   ===========   ===========
Supplemental cash flow information -- Cash paid for
  interest............................................    $      --     $     7,400   $    27,600   $     5,200   $   493,500
                                                          =========     ===========   ===========   ===========   ===========
Noncash investing and financing activities:
  Remaining obligation for right to use fiber optic
    capacity..........................................    $      --     $        --   $        --   $        --   $ 6,425,000
                                                          =========     ===========   ===========   ===========   ===========
  Acquisition of equipment under capital lease........    $      --     $   206,200   $   479,200   $        --   $        --
                                                          =========     ===========   ===========   ===========   ===========
  Acquisition of leasehold improvements in conjunction
    with DSK, Inc. acquisition........................    $      --     $   168,900   $        --   $        --   $        --
                                                          =========     ===========   ===========   ===========   ===========
  Exchange of notes, advances, accrued interest and
    warrants for convertible preferred stock..........    $      --     $   210,000   $ 4,884,500   $ 1,011,100   $ 8,000,000
                                                          =========     ===========   ===========   ===========   ===========
  Conversion of preferred stock into common stock.....    $      --     $        --   $        --   $        --   $21,223,900
                                                          =========     ===========   ===========   ===========   ===========
  Issuance of warrants in connection with issuance of
    debt..............................................    $      --     $        --   $    45,000   $        --   $   899,500
                                                          =========     ===========   ===========   ===========   ===========
</TABLE>
 
                       See notes to financial statements.
                                       F-6
<PAGE>   83
 
                          ABOVENET COMMUNICATIONS INC.
 
                         NOTES TO FINANCIAL STATEMENTS
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
ORGANIZATION -- AboveNet Communications Inc. (the "Company"), a California
corporation, was formed on March 8, 1996 (inception). The Company provides
managed co-location and Internet connectivity solutions for mission critical
Internet operations.
 
USE OF ESTIMATES -- 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.
 
CONCENTRATION OF CREDIT RISK -- Financial instruments that potentially subject
the Company to concentration of credit risk consist of trade receivables.
However, the Company's credit risk is mitigated by its credit evaluation process
and the reasonably short collection terms. The Company does not require
collateral or other security to support accounts receivable and maintains
reserves for potential credit losses. To date, such losses have not been
significant.
 
CASH AND EQUIVALENTS -- The Company considers all highly liquid investments with
an original maturity of ninety days or less to be cash equivalents.
 
PROPERTY AND EQUIPMENT -- Property and equipment are stated at cost.
Depreciation is computed using the straight-line method over the estimated
useful lives of three to five years. Leasehold improvements and assets acquired
under capital lease are amortized over the shorter of the lease term or the
useful lives of the improvement.
 
DEPOSITS AND OTHER ASSETS -- Deposits and other assets at December 31, 1998
include deferred financing costs of approximately $921,300.
 
RESTRICTED CASH -- Restricted cash consists of certificates of deposit which are
restricted from use pursuant to certain capital lease agreements.
 
REVENUE RECOGNITION -- Revenue consists primarily of service revenue for which
revenue is recognized in the period in which the services are provided. The
services primarily include bandwidth and space requirement charges which are
recognized monthly as well as installation fees which are recognized as revenue
in the period of installation. Advance customer deposits received are deferred
until the period in which the services are rendered.
 
INCOME TAXES -- Deferred tax liabilities are recognized for future taxable
amounts, and deferred tax assets are recognized for future deductions, net of a
valuation allowance to reduce net deferred tax assets to amounts that are more
likely than not to be realized.
 
STOCK-BASED COMPENSATION -- The Company accounts for stock-based awards to
employees using the intrinsic value method in accordance with Accounting
Principles Board (APB) Opinion No. 25, "Accounting for Stock Issued to
Employees."
 
IMPAIRMENT OF LONG-LIVED ASSETS AND LONG-LIVED ASSETS TO BE DISPOSED OF -- The
Company evaluates its long-lived assets and certain identifiable intangibles for
impairment whenever events or changes in circumstances indicate that the
carrying amount of such assets or intangibles may not be recoverable.
Recoverability of assets to be held and used is measured by a comparison of the
carrying amount of an asset to future net cash flows expected to be generated by
the asset. If such assets are considered to be
                                       F-7
<PAGE>   84
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
impaired, the impairment to be recognized is measured by the amount by which the
carrying amount of the assets exceed the fair value of the assets. Assets to be
disposed of are reported at the lower of the carrying amount or fair value less
costs to sell.
 
NET INCOME (LOSS) PER SHARE -- Basic income (loss) per share excludes dilution
and is computed by dividing net income (loss) by the weighted-average number of
common shares outstanding, less shares subject to repurchase by the Company, for
the period. Diluted income (loss) per share reflects the potential dilution that
could occur if securities or other contracts to issue common stock were
exercised or converted into common stock. Common shares equivalents are excluded
from the computation in loss periods as their effect would be antidilutive.
 
UNAUDITED INTERIM FINANCIAL INFORMATION -- The interim financial information as
of December 31, 1998 and for the six months ended December 31, 1997 and 1998 is
unaudited and has been prepared on the same basis as the audited financial
statements. In the opinion of management, such unaudited information includes
all adjustments (consisting only of normal recurring adjustments) necessary for
a fair presentation of the interim information. Operating results for the six
months ended December 31, 1998 are not necessarily indicative of the results
that may be expected for the year ending June 30, 1999.
 
RECLASSIFICATIONS -- Certain prior year amounts have been reclassified to
conform to the current year presentation. Such reclassifications had no effect
on stockholders equity (deficiency) or net loss.
 
RECENTLY ISSUED ACCOUNTING STANDARDS -- In June 1997, the Financial Accounting
Standards Board (FASB) issued Statement of Financial Accounting Standards (SFAS)
No. 130, "Reporting Comprehensive Income," which requires an enterprise to
report, by major components and as a single total, the change in the Company's
net assets during the period from nonowner sources; and SFAS No. 131,
"Disclosures About Segments of an Enterprise and Related Information," which
establishes annual and interim reporting standards for an enterprise's business
segments and related disclosures about the Company's products, services,
geographic areas and major customers. The Company will adopt both statements in
fiscal 1999. The Company has not yet identified its SFAS No. 131 reporting
segments. Adoption of these statements will not impact the Company's financial
position, results of operations or cash flows.
 
In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants issued SOP 98-1, "Accounting for the
Costs of Computer Software Developed or Obtained for Internal Use." SOP 98-1
provides guidance for an enterprise on accounting for the costs of computer
software developed or obtained for internal use. SOP 98-1 is effective for the
Company in fiscal 2000. The Company anticipates that accounting for transactions
under SOP 98-1 will not have a material impact on its financial position or
results of operations.
 
In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities," which defines derivatives, requires that
all derivatives be carried at fair value, and provides for hedge accounting when
certain conditions are met. SFAS No. 133 is effective for the Company in fiscal
2000. Although the Company has not fully assessed the implications of SFAS No.
133, the Company does not believe adoption of this statement will have a
material impact on its financial position or results of operations.
 
                                       F-8
<PAGE>   85
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
2. PROPERTY AND EQUIPMENT, NET
 
Property and equipment are comprised of the following:
 
<TABLE>
<CAPTION>
                                                       JUNE 30,
                                                -----------------------    DECEMBER 31,
                                                  1997          1998           1998
                                                ---------    ----------    ------------
<S>                                             <C>          <C>           <C>
Property and equipment, at cost:
  Telecommunication equipment.................  $ 774,300    $2,295,300    $ 3,406,800
  Leasehold improvements (primarily
     co-location facilities)..................    168,900       224,700     11,605,400
  Office equipment............................      7,500       186,500        695,700
  Construction in progress....................         --     2,389,400        830,800
                                                ---------    ----------    -----------
          Total...............................    950,700     5,095,900     16,538,700
Less accumulated depreciation and
  amortization................................   (184,300)     (659,800)    (1,531,100)
                                                ---------    ----------    -----------
Property and equipment, net...................  $ 766,400    $4,436,100    $15,007,600
                                                =========    ==========    ===========
</TABLE>
 
Construction in progress primarily relates to costs incurred during the
expansion of our facilities.
 
3. CONVERTIBLE NOTES PAYABLE AND ADVANCES
 
In June 1997, the Company received $739,900 in cash advances from certain
individuals, including stockholders and employees. In July and August 1997, the
Company received an additional $250,000 in cash advances. In August 1997, the
advances were converted into notes payable of $989,900 and warrants to acquire
494,953 shares of Series B convertible preferred stock at $2.00 per share. The
notes generally bore an annual interest rate of 10%. The related warrants were
valued at $112,000, or $0.23 per share, and were recorded as a noncash interest
charge in 1998.
 
On December 31, 1997, the Company entered into exchange agreements with the note
holders. Pursuant to the exchange agreements, the above notes, accrued interest
of $21,200 and the related warrants were exchanged for (i) 631,896 shares of
Series B convertible preferred stock and (ii) warrants to acquire 123,736 shares
of Series B convertible preferred stock at $2.00 per share.
 
During fiscal 1998, the Company received $3,873,400 of cash advances from
certain potential investors. In May 1998, these advances were converted into
2,003,000 shares of Series C convertible preferred stock.
 
On June 30, 1998, in anticipation of the Company's pending sale of preferred
stock, the Company received $8 million in cash, of which $1 million represented
a noninterest bearing cash advance and $7 million represented convertible notes
payable. The notes bore interest at 6%, were due on July 15, 1998 and were
convertible into Series D convertible preferred stock at $5.20 per share. On
July 15, 1998, the convertible notes and advance were converted into Series D
convertible preferred stock (see Note 6).
 
                                       F-9
<PAGE>   86
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
4. OTHER LONG-TERM OBLIGATIONS
 
Long-term obligations consist of:
 
<TABLE>
<CAPTION>
                                                                JUNE 30,
                                                         ----------------------    DECEMBER 31,
                                                           1997         1998           1998
                                                         --------    ----------    ------------
<S>                                                      <C>         <C>           <C>
Credit facility........................................  $     --    $1,201,600    $ 7,901,700
Capital lease facility.................................   156,600       551,100        408,600
Deferred rent..........................................    30,400        48,600        127,500
                                                         --------    ----------    -----------
          Total obligations............................   187,000     1,801,300      8,437,800
Current portion of long-term obligations...............   (71,500)     (476,000)    (1,937,700)
                                                         --------    ----------    -----------
Long-term obligations..................................  $115,500    $1,325,300    $ 6,500,100
                                                         ========    ==========    ===========
</TABLE>
 
  Credit Facility
 
At June 30, 1998, the Company had a $6 million credit facility (the "Credit
Facility"), $1,271,600 of which had been drawn as of June 30, 1998. Proceeds
from borrowings on the Credit Facility may be used solely for the purpose of
acquiring network operating center equipment, office equipment and leasehold
improvements. Borrowings outstanding under the Credit Facility are payable in 42
monthly installments, bear interest at 14.7% and are collateralized by the
equipment and improvements purchased with the proceeds of the borrowing. The
ability to borrow on the Credit Facility expires June 30, 1999. At June 30,
1998, the outstanding borrowings on the Credit Facility are due as follows:
fiscal 1999, $252,000; fiscal 2000, $301,800; fiscal 2001, $349,300 and fiscal
2002, $298,500.
 
During the six months ended December 31, 1998, the Company and the financing
company amended the Credit Facility to increase the total facility to $15.0
million. At December 31, 1998, approximately $9.0 million had been drawn on the
Credit Facility.
 
  Capital Lease Facility
 
At June 30, 1998, the Company had $1.45 million available on a $2 million
capital lease facility for which the Company leases certain equipment under
noncancelable capital leases. Leases outstanding at June 30, 1998 expire on
various dates through 2001 (see Note 9). In August 1998, the Company increased
its capital lease facility to $2.5 million. At December 31, 1998, the Company
had approximately $1.95 million available under this facility.
 
  Line of Credit
 
The Company has a revolving line of credit from a bank which provides for
borrowings up to $750,000 through May 1999. Borrowings under the line bear
interest at the bank's prime rate plus 1% per annum (9.5% at June 30, 1998) and
are collateralized by substantially all of the Company's assets. As of June 30,
1998, the Company had no borrowings outstanding on the line of credit. The line
of credit agreement limits the Company's ability to pay cash dividends without
the bank's consent and requires, among other things, that the Company satisfy
certain financial covenants. As of June 30, 1998, the Company was not in
compliance with the profitability covenant of its revolving line of credit
agreement. The Company has obtained a waiver with respect to this covenant from
the bank as of June 30, 1998, and has renegotiated the covenant terms with the
bank. In connection with the line of credit agreement, in June 1998, the
 
                                      F-10
<PAGE>   87
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
4. OTHER LONG-TERM OBLIGATIONS (CONTINUED)
Company issued to the bank a warrant to purchase 1,250 shares of its Series D
preferred stock at $4.00 per share. The warrant had an estimated fair value of
$1,900 or $1.52 per share.
 
5. INCOME TAXES
 
The Company's deferred income tax assets are comprised of the following:
 
<TABLE>
<CAPTION>
                                                                     JUNE 30,
                                                             ------------------------
                                                               1997          1998
                                                             ---------    -----------
<S>                                                          <C>          <C>
Net deferred tax assets:
  Net operating loss carryforwards.........................  $ 516,900    $ 1,975,900
  Stock compensation expense on nonqualified stock
     options...............................................         --        512,300
  Accruals deductible in different periods.................     57,000        121,100
  Depreciation and amortization............................    (14,800)       (68,800)
                                                             ---------    -----------
                                                               559,100      2,540,500
Valuation allowance........................................   (559,100)    (2,540,500)
                                                             ---------    -----------
          Total............................................  $      --    $        --
                                                             =========    ===========
</TABLE>
 
The Company's effective rate differs from the federal statutory tax rate as
follows:
 
<TABLE>
<CAPTION>
                                                         MARCH 8, 1996      YEAR ENDED
                                                          (INCEPTION)        JUNE 30,
                                                          TO JUNE 30,     --------------
                                                             1996         1997     1998
                                                         -------------    -----    -----
<S>                                                      <C>              <C>      <C>
Federal statutory tax rate.............................       35.0%        35.0%    35.0%
State taxes, net of federal benefit....................        6.0          6.0      6.0
Joint venture termination fee..........................         --         (9.8)      --
Other..................................................       (8.8)        (1.8)    (1.2)
Valuation allowance....................................      (32.2)       (29.4)   (39.8)
                                                             -----        -----    -----
  Effective tax rate...................................         --%          --%      --%
                                                             =====        =====    =====
</TABLE>
 
The Company has no income tax provision due to its history of operating losses.
Due to the uncertainty surrounding the realization of the benefits of its
favorable tax attributes in future tax returns, the Company has fully reserved
its net deferred tax assets as of June 30, 1997 and 1998.
 
At June 30, 1998, the Company had net operating loss carryforwards of
approximately $4.9 million for federal and state income tax purposes. These
carryforwards begin to expire in 2003 for state and 2010 for federal purposes.
Additionally, Section 382 of the Internal Revenue Code and the applicable
California law impose annual limitations on the use of net operating loss
carryforwards if there is a change in ownership, as defined, within any
three-year period. The utilization of certain net operating loss carryforwards
may be limited due to the Company's capital stock transactions.
 
                                      F-11
<PAGE>   88
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
6. STOCKHOLDERS' EQUITY (DEFICIENCY)
 
  Common Stock Reserved for Future Issuance
 
At June 30, 1998 and December 31, 1998, the Company has reserved the following
shares of common stock for issuance in connection with:
 
<TABLE>
<CAPTION>
                                                              JUNE 30, 1998    DECEMBER 31, 1998
                                                              -------------    -----------------
<S>                                                           <C>              <C>
Conversion of Series A preferred stock......................    1,025,000                 --
Conversion of Series B preferred stock......................    1,631,896                 --
Conversion of Series C preferred stock......................    2,003,000                 --
Warrants issued and outstanding.............................      157,330            172,658
Options issued and outstanding..............................      978,916          1,897,124
Options available under stock option plans..................      744,283          1,459,250
Shares available under 1998 Purchase Plan...................           --            156,250
                                                                ---------          ---------
          Total.............................................    6,540,425          3,685,282
                                                                =========          =========
</TABLE>
 
  Convertible Preferred Stock
 
Significant terms of the Series A, B, C, D and E convertible preferred stock are
as follows (see Note 12):
 
  - At the option of the holder, each share of preferred stock is convertible at
    any time into one share of common stock, subject to adjustment for certain
    dilutive issuances. Shares automatically convert into common stock upon the
    completion of a public offering with aggregate proceeds greater than
    $20,000,000 and at a price per share of not less than $12.00 (see Note 12).
 
  - Series A, B, C, D and E convertible preferred stock have no preference as to
    dividends but have a noncumulative right to participate in and receive the
    same dividends as may be declared for common stockholders.
 
  - In the event of a liquidation, dissolution or winding up of the Company
    (which includes the acquisition of the Company by another entity), the
    holders of Series A, B, C, D and E convertible preferred stock have a
    liquidation preference over common stock of $0.40, $1.20, $2.00, $5.20 and
    $12.00 per share, respectively. Upon payment of the preferred stock
    liquidation preference (aggregating $6,374,300 at June 30, 1998), the
    remaining proceeds will be allocated to the preferred and common
    stockholders on an as converted basis.
 
  - Each share of preferred stock has voting rights equivalent to the number of
    shares of common stock into which it is convertible.
 
In fiscal 1997, the Company issued 1,025,000 shares of Series A convertible
preferred stock for cash of $200,000 and the conversion of advances of $210,000.
Also in fiscal 1997, the Company issued 500,000 shares of Series B convertible
preferred stock in connection with the acquisition of DSK, Inc. (see Note 8) and
issued 500,000 shares of Series B convertible preferred stock for cash of
$600,000. In fiscal 1998, the Company issued 631,896 shares of Series B
convertible preferred stock and 2,003,000 shares of Series C convertible
preferred stock upon conversions of notes, advances and accrued interest of
$1,011,100 and $3,873,400, respectively (see Note 3). During the six months
ended December 31, 1998, the Company issued 2,115,378 shares of Series D
convertible preferred stock for cash of $2,771,000 (net
 
                                      F-12
<PAGE>   89
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
6. STOCKHOLDERS' EQUITY (DEFICIENCY) (CONTINUED)
of costs of $229,000) and the conversion of notes and advances of $8,000,000.
During the same period, the Company issued 408,775 shares of Series E
convertible preferred stock for cash of $3,846,400 (net of costs of $223,600).
See Note 12 related to the conversion of all outstanding preferred stock into
common stock upon completion of the Company's initial public offering in
December 1998.
 
  Convertible Preferred Stock Warrants
 
As discussed in Note 3, pursuant to certain exchange agreements entered into on
December 31, 1997, the Company issued warrants to acquire 123,736 shares of
Series B convertible preferred stock at $2.00 per share. These warrants expire
on the earlier of (i) January 1, 2002, (ii) an underwritten public offering or
(iii) a change in control (See Note 12). Also, as discussed in Note 4, warrants
to purchase 1,250 shares of Series D convertible preferred stock at $4.00 per
share were outstanding at June 30, 1998.
 
  Common Stock Subject to Repurchase
 
In fiscal 1998, upon the exercise of an option the Company sold 12,500 shares of
common stock at $0.40 per share to an employee subject to repurchase whereby the
Company has the right to repurchase such shares at their original purchase
price. This right lapses over four years. At June 30, 1998, 12,500 shares were
subject to such repurchase rights.
 
  1996 Stock Option Plan
 
In March 1996, the Company adopted the 1996 Stock Option Plan (the "1996 Plan").
As of June 30, 1998, there were 505,885 options authorized for issuance under
the 1996 Plan. The 1996 Plan is administered by the Board of Directors and
encompasses nonstatutory and incentive stock options. Nonstatutory stock options
may be granted to employees and consultants, whereas incentive stock options may
only be granted to employees.
 
The 1996 Plan provides for the granting of incentive stock options at not less
than 100% of the fair market value of the underlying stock at the grant date.
Nonstatutory options may be granted at not less than 85% of the fair market
value of the underlying stock at the date of grant. Options under the 1996 Plan
generally vest over four years and expire ten years from the date of grant.
 
  1997 Stock Option Plan
 
In fiscal 1998, the Company adopted the 1997 Stock Option Plan (the "1997
Plan"), authorizing 1,124,423 shares of common stock to be issued as options.
Upon a change in control, all shares granted under the 1997 Plan shall
immediately vest. Other provisions of the 1997 Plan are generally the same as
the 1996 Plan.
 
  Nonplan Option Grant
 
In connection with its hiring of the Company's President and Chief Operating
Officer in November 1997, the Company granted to this officer options to
purchase 175,000 shares of common stock with an exercise price of $0.40 per
share. The option is immediately exercisable with respect to 20% of the option
shares and the balance becomes exercisable in equal monthly installments over
the next 36 months of employment with the Company measured from November 1997.
However, vesting accelerates upon the
                                      F-13
<PAGE>   90
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
6. STOCKHOLDERS' EQUITY (DEFICIENCY) (CONTINUED)
closing of an underwritten public offering. In addition, the option grant
contains an antidilution clause which guarantees that, prior to any underwritten
initial public offering of the Company's common stock, the number of shares
under the option grant will always be equal to 5% of its outstanding common
stock on a fully diluted basis less 18,333 shares. As a result of various sales
of equity securities and option grants since the initial grant in November 1997,
the officer was issued options to acquire an additional 319,425 shares of common
stock at an exercise price of $0.40 per share during the six months ended
December 31, 1998. In connection with this award, the Company recognized
$362,100 and $1,087,200 in stock-based compensation expense during fiscal 1998
and the six months ended December 31, 1998, respectively.
 
  Options and Warrants Granted to Nonemployees
 
The Company has granted options and warrants to nonemployees for services
performed and to be performed after the date of grant. In connection with these
awards, the Company recognized $310,100 in stock-based compensation expense
during fiscal 1998 ($33,300 during the six months ended December 31, 1998). At
June 30, 1998 and December 31, 1998, all services relating to these awards has
been rendered and the options and warrants were fully exercisable.
 
In connection with the Credit Facility (see Note 4), in fiscal 1998, the Company
issued warrants to acquire 22,500 shares of common stock at a weighted-average
exercise price of $4.61 per share. The fair value of these warrants are being
recognized as interest expense through June 30, 1999. During the six months
ended December 31, 1998, in connection with the amendment to the Credit Facility
(see Note 4), the Company issued warrants to acquire 25,000 shares of common
stock, 25,000 of which have a weighted-average exercise price of $10.20 per
share and have a term of five years. The estimated fair value of these warrants
of $290,300 is included in Deposits and other assets at December 31, 1998 and
will be amortized to interest expense over the repayment period.
 
At June 30, 1998, warrants to acquire 32,344 shares of common stock at a
weighted-average exercise price of $4.19 per share were outstanding; such
warrants expire in 2003. All of these warrants were issued during the year ended
June 30, 1998 (none issued in fiscal 1996 or 1997) and had an estimated
weighted-average fair value of $2.46 per share at the date of grant. At December
31, 1998, warrants to acquire 172,658 shares of common stock at a
weighted-average exercise price of $8.76 per share were outstanding.
 
  Deferred Stock Compensation
 
At June 30, 1998 and December 31, 1998, the Company had $540,100 and $76,900,
respectively, in deferred stock compensation related to options granted to
employees. This amount will be amortized to stock-based compensation expense
through fiscal 2000. See Note 12.
 
  Option Repricing
 
On December 1, 1998, the Company repriced 473,800 options previously granted at
$12.00 per share to fair value at that date of $10.00 per share.
 
                                      F-14
<PAGE>   91
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
6. STOCKHOLDERS' EQUITY (DEFICIENCY) (CONTINUED)
Stock option activity under the Plans and the Nonplan Option Grant are
summarized as follows:
 
<TABLE>
<CAPTION>
                                                                 OUTSTANDING OPTIONS
                                                             ----------------------------
                                                              NUMBER     WEIGHTED AVERAGE
                                                             OF SHARES    EXERCISE PRICE
                                                             ---------   ----------------
<S>                                                          <C>         <C>
Balance, March 8, 1996 (inception).........................         --        $   --
Granted....................................................    570,000          0.04
                                                             ---------
Balance, June 30, 1996 (68,750 shares vested at a weighted
  average exercise price of $0.04 per share)...............    570,000          0.04
Granted....................................................    225,000          0.13
Exercised..................................................    (15,625)         0.04
Canceled...................................................   (194,375)         0.04
                                                             ---------
Balance, June 30, 1997 (109,687 shares vested at a weighted
  average exercise price of $0.04 per share)...............    585,000          0.06
Granted....................................................    571,306          1.17
Exercised..................................................   (161,223)         0.19
Canceled...................................................    (16,167)         0.62
                                                             ---------
Balance, June 30, 1998.....................................    978,916          0.67
Granted....................................................  1,626,775          8.57
Exercised..................................................   (187,100)         0.36
Canceled...................................................   (521,467)        11.47
                                                             ---------
Balance, December 31, 1998.................................  1,897,124        $ 4.50
                                                             =========
</TABLE>
 
The following table summarizes information as of June 30, 1998 concerning
currently outstanding and vested options:
 
<TABLE>
<CAPTION>
                       OPTIONS OUTSTANDING
               ------------------------------------      OPTIONS VESTED
                             WEIGHTED                 --------------------
                              AVERAGE      WEIGHTED               WEIGHTED
                NUMBER       REMAINING     AVERAGE                AVERAGE
  EXERCISE        OF        CONTRACTUAL    EXERCISE    NUMBER     EXERCISE
   PRICES       SHARES     LIFE (YEARS)     PRICE     OF SHARES    PRICE
  --------     ---------   -------------   --------   ---------   --------
<S>            <C>         <C>             <C>        <C>         <C>
$0.04 - $0.20   524,386         8.0         $0.08      283,229     $0.08
    0.40        271,250         9.4          0.40       25,000      0.40
    1.20         79,655         9.6          1.20       47,656      1.20
    4.00        103,625         9.9          4.00       11,250      4.00
                -------                                -------
$0.04 - $4.00   978,916         8.7          0.67      367,135      0.37
                =======                                =======
</TABLE>
 
At June 30, 1998, none and 744,283 shares were available for future grant under
the 1996 and 1997 Plans, respectively. At December 31, 1998, 1,459,250 shares
remained available for future grant under the 1998 Plan (none under the 1996 and
1997 Plans).
 
                                      F-15
<PAGE>   92
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
6. STOCKHOLDERS' EQUITY (DEFICIENCY) (CONTINUED)
  Additional Stock Plan Information
 
As discussed in Note 1, the Company accounts for its stock-based awards to
employees using the intrinsic value method in accordance with APB Opinion No.
25, "Accounting for Stock Issued to Employees," and its related interpretations.
 
SFAS No. 123, "Accounting for Stock-Based Compensation," requires the disclosure
of pro forma net income (loss) and earnings (loss) per share had the Company
adopted the fair value method since the Company's inception. Under SFAS No. 123,
the fair value of stock-based awards to employees is calculated through the use
of option pricing models, even though such models were developed to estimate the
fair value of freely tradable, fully transferable options without vesting
restrictions, which significantly differ from the Company's stock option awards.
These models also require subjective assumptions, including future stock price
volatility and expected time to exercise, which greatly affect the calculated
values.
 
The Company's calculations for employee grants were made using the minimum value
method with the following weighted average assumptions: expected life, one year
following vest; no stock volatility; risk free interest rate of 6%; and no
dividends during the expected term. The Company's calculations are based on a
multiple award valuation approach, and forfeitures are recognized as they occur.
If the computed minimum values of the Company's stock-based awards to employees
had been amortized to expense over the vesting period of the awards as specified
under SFAS No. 123, net loss would have been $78,000 ($0.62 per basic and
diluted share), $1,803,800 ($9.17 per basic and diluted share), and $5,111,000
($19.49 per basic and diluted share) for the period from inception to June 30,
1996 and for the years ended June 30, 1997 and 1998, respectively.
 
The number and estimated weighted-average minimum and fair value per option for
employee and nonemployee awards, respectively, granted are as follows:
 
<TABLE>
<CAPTION>
                                                                       YEAR ENDED JUNE 30,
                                              INCEPTION TO JUNE 30,    --------------------
                                                      1996               1997        1998
                                              ---------------------    --------    --------
<S>                                           <C>                      <C>         <C>
Employee Options:
  Number of shares..........................         551,250                 --     501,625
  Estimate weighted-average minimum value...        $   0.01           $     --    $   0.20
Nonemployee Options:
  Number of shares..........................          18,750            225,000      69,681
  Estimated weighted-average fair value.....        $   0.01           $   0.03    $   0.15
</TABLE>
 
                                      F-16
<PAGE>   93
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
7. NET LOSS PER SHARE
 
The following is a reconciliation of the numerators and denominators used in
computing basic and diluted net loss per share.
 
<TABLE>
<CAPTION>
                                                                                  SIX MONTHS ENDED
                                     INCEPTION       YEAR ENDED JUNE 30,            DECEMBER 31,
                                    TO JUNE 30,   -------------------------   -------------------------
                                       1996          1997          1998          1997          1998
                                    -----------   -----------   -----------   -----------   -----------
<S>                                 <C>           <C>           <C>           <C>           <C>
Net loss (numerator), basic and
  diluted.........................   $(77,600)    $(1,802,800)  $(5,425,000)  $(1,266,400)  $(8,543,100)
                                     ========     ===========   ===========   ===========   ===========
Shares (denominator):
  Weighted average common shares
     outstanding..................    125,000         196,618       265,112       214,400     1,911,100
  Weighted average common shares
     outstanding subject to
     repurchase...................         --              --        (2,808)           --       (14,100)
                                     --------     -----------   -----------   -----------   -----------
Shares used in computation, basic
  and diluted.....................    125,000         196,618       262,304       214,400     1,897,000
                                     --------     -----------   -----------   -----------   -----------
Net loss per share, basic and
  diluted.........................   $  (0.62)    $     (9.17)  $    (20.68)  $     (5.91)  $     (4.50)
                                     ========     ===========   ===========   ===========   ===========
</TABLE>
 
For the above mentioned periods, the Company had securities outstanding which
could potentially dilute basic earnings per share in the future, but were
excluded in the computation of diluted net loss per share in the periods
presented, as their effect would have been antidilutive. Such outstanding
securities consist of the following at June 30, 1998 (at December 31, 1998 in
parenthesis): 4,659,896 (none) shares of convertible preferred stock, warrants
to purchase 124,986 (none) shares of convertible preferred stock, 12,500
(14,750) outstanding shares of common stock subject to repurchase, and options
and warrants to purchase 1,011,260 (2,069,782) shares of common stock.
 
8. JOINT VENTURE TERMINATION FEE
 
In fiscal 1996, the Company entered into a joint venture agreement (the
"Agreement") with DSK, Inc. ("DSK") to cooperatively market and develop the
Company's services. The Company paid $33,700 to DSK during the year ended June
30, 1997 related to the Agreement.
 
In April 1997, the Company terminated the Agreement and hired the majority
stockholders of DSK as either employees or consultants by issuing 500,000 fully
vested shares of the Series B preferred stock with a fair value of $1.20 per
share, or $600,000, for the outstanding shares of common stock of DSK. The
Company recorded the transaction by allocating the value of the shares issued to
property and equipment (at DSK's net book value of $168,900, which approximated
fair market value), with the balance of $431,100 reflected as a joint venture
termination fee.
 
Additionally, in April 1997, the Company granted to certain of the former owners
of DSK options to acquire a total of 125,000 shares of its common stock at $0.12
per share for real estate consulting services to be performed. In June 1998, the
Company accelerated the vesting of all the DSK options awarded. In conjunction
with this award, the Company recognized $604,200 of stock-based compensation
expense during fiscal 1998.
 
                                      F-17
<PAGE>   94
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
9. COMMITMENTS AND CONTINGENCIES
 
  Leases
 
The Company leases its facilities under noncancelable operating leases. These
leases expire on various dates through 2002. Minimum future lease payments under
noncancelable operating and capital leases as of June 30, 1998 are summarized as
follows:
 
<TABLE>
<CAPTION>
                                                      CAPITAL      OPERATING
                    FISCAL YEAR                        LEASES       LEASES
                    -----------                       --------    -----------
<S>                                                   <C>         <C>
1999................................................  $248,300    $   968,800
2000................................................   196,900      1,055,000
2001................................................   180,400      1,099,700
2002................................................        --      1,132,500
2003................................................        --      1,185,700
Thereafter..........................................        --      5,002,900
                                                      --------    -----------
Total minimum lease payments........................   625,600    $10,444,600
                                                                  ===========
Less amount representing interest...................   (74,500)
                                                      --------
Present value of minimum lease payments.............   551,100
Less current portion................................  (224,000)
                                                      --------
Long term portion...................................  $327,100
                                                      ========
</TABLE>
 
Rent expense under the operating leases for the period from March 8, 1996
(inception) to June 30, 1996 and for the years ended June 30, 1997 and 1998 was
approximately none, $61,500, and $444,905, respectively.
 
During the six months ended December 31, 1998, the Company entered into
agreements to lease optical fiber. These leases are expected to commence in
early calendar 1999 upon the installation and acceptance of the connected fiber.
The lease will require annual payments of $630,000 for 20 years from
installation. This arrangement will be accounted for as a capital lease upon
initiation of the lease term.
 
  Purchase Commitments
 
In fiscal 1998, the Company entered into noncancelable commitments to purchase
property and equipment related to the expansion of its operations facilities. As
of June 30, 1998, approximately $1.7 million was committed for fiscal 1999
purchases under these agreements.
 
  Telecommunications and Peering Arrangements
 
The Company has guaranteed to pay certain monthly usage levels or fees with
various communications or interconnect providers. Minimum payments under these
agreements at June 30, 1998 are as follows: $3.9 million in fiscal 1999 and $1.3
million in fiscal 2000.
 
The Company is a party to numerous peering agreements with other internet
providers to allow for the exchange of internet traffic. These agreements do not
have fee commitments and generally have a one year term with automatic renewals.
The Company does not record any revenue or expense associated with these
 
                                      F-18
<PAGE>   95
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
9. COMMITMENTS AND CONTINGENCIES (CONTINUED)
non-cash transactions as such transactions do not represent the culmination of
the earnings process and the fair value of such transactions are not reasonably
determinable.
 
  Legal Matters
 
The Company is involved in various claims and legal actions arising out of the
normal course of business. Management does not expect that the outcome of these
cases will have a material effect on the Company's financial position or results
of operations.
 
10. RELATED PARTY TRANSACTIONS
 
A member of the Board of Directors is the President of an entity which is the
co-manager of our primary facilities. Rent expense in fiscal 1996, 1997 and 1998
and for the six months ended December 31, 1998 for these facilities was none,
$16,400, $265,200, and $397,300 respectively. The Company believes that its
lease arrangements were at an arm's length basis.
 
11. MAJOR CUSTOMERS
 
Two customers accounted for 32% and 25% of revenues in fiscal 1996, while
another customer accounted for 12% and 14% of revenues in fiscal 1997 and 1998,
respectively.
 
At June 30, 1998, two customers accounted for approximately 22% and 13% of trade
receivables, while four other customers accounted for 13%, 13%, 11% and 10% of
trade receivables at June 30, 1997.
 
12. SUBSEQUENT EVENTS
 
Subsequent to June 30, 1998, the Company changed the authorized number of shares
of the common and preferred stock to 20,000,000 and 14,000,000 respectively.
Additionally, the Company designated 2,125,000 and 1,750,000 shares of preferred
stock as Series D and E, respectively. In July 1998, the Company issued
2,115,378 shares of Series D convertible preferred stock in exchange for the
conversion of the $8,000,000 notes payable and advances outstanding at June 30,
1998 and additional cash of $2,771,000 (net of costs of $229,000). On September
4, 1998, we sold 408,775 shares of Series E convertible preferred stock at
$10.00 per share for proceeds of $3,846,400 (net of costs of $223,600).
 
On August 27, 1998, the Board of Directors adopted the 1998 Stock Incentive Plan
(the "1998 Stock Plan"). The 1998 Stock Plan will serve as the successor equity
incentive program to our existing 1997 Plan effective upon the execution of an
underwriting agreement to sell shares in an initial public offering. A total of
1,562,500 shares of common stock have been reserved for issuance under the 1998
Stock Plan.
 
Additionally, on August 27, 1998, the Board of Directors adopted the 1998
Employee Stock Purchase Plan (the "1998 Purchase Plan"). Under the 1998 Purchase
Plan, eligible employees are allowed to have salary withholdings of up to 10% of
their base compensation to purchase shares of common stock at a price equal to
85% of the lower of the market value of the stock at the beginning or end of
defined purchase periods. The initial purchase period commenced on December 10,
1998. The Company has reserved 156,250 shares of common stock for issuance under
this plan.
 
                                      F-19
<PAGE>   96
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
12. SUBSEQUENT EVENTS (CONTINUED)
On August 27, 1998, the Board of Directors approved a change in the authorized
number of shares of the common and preferred stock upon the closing of the
initial public offering to 60,000,000 and 5,000,000, respectively.
 
On September 3, 1998, the Board of Directors approved the Company's
reincorporation in the State of Delaware and the associated exchange of one
share of common stock and preferred stock of the Company for every two and
one-half shares of common stock and preferred stock, respectively, of its
California predecessor entity. Such reincorporation and stock exchange became
effective on November 5, 1998.
 
On November 11, 1998, the Board of Directors adopted a 1-for-1.6 reverse split
of the outstanding shares of common and preferred stock. Additionally, on
November 11, 1998, the Board of Directors approved, subject to stockholder
approval, an amendment to the Certificate of Incorporation to require the
automatic conversion of preferred stock into common stock in connection with any
public offering occurring prior to March 31, 1999 regardless of the offering
price.
 
All share and per share amounts in these financial statements have been adjusted
to give effect to the reincorporation, the associated 1-for-2.5 exchange and the
subsequent 1-for-1.6 reverse stock split.
 
On December 4, 1998, the Company entered into a new facility lease agreement.
The agreement is for a minimum of 20 years with annual rent payments increasing
from approximately $3 million to $5 million over the lease term. In connection
with the lease, the Company issued the lessor a warrant to buy 100,000 shares of
its common stock at $10.00 per share.
 
On December 10, 1998, the Company sold 5,000,000 shares of common stock in an
underwritten public offering and on December 30, 1998 sold an additional 750,000
shares through the exercise of the underwriters' over-allotment option for net
proceeds of approximately $67,986,900. Simultaneously with the closing of the
public offering, all 7,184,049 shares of the Company's preferred stock were
converted to common stock on a share for share basis. Additionally, all of the
holders of warrants to purchase 123,736 shares of Series B convertible preferred
stock exercised such warrants through a net issuance provision and were issued
104,700 shares of common stock.
 
As discussed in Note 6, the vesting of the options related to the Nonplan Option
Grant accelerated upon the closing of the offering. Accordingly, all remaining
unamortized compensation relating to this grant was recognized.
 
On December 29, 1998, the Company entered into a series of agreements with
affiliates of Global Crossing Ltd. providing for the acquisition of an
indefeasible right to use ("IRU") capacity on a fiber optic cable system between
the U.S. and the United Kingdom. The agreements, which have 25 year terms,
provide for the Company to pay affiliates of Global Crossing Ltd. up to
approximately $8.3 million for the capacity in installments during December 1998
and the first calendar quarter of 1999.
 
On March 24, 1999, the Company entered into a series of agreements with
affiliates of Global Crossing Ltd. providing for the acquisition of a 25 year
indefeasible right to use ("IRU") capacity on a fiber optic cable system between
the U.S. and the Netherlands. The agreements, provide for the Company to pay
affiliates of Global Crossing Ltd. up to approximately $7.5 million for the
capacity, in installments through December 30, 1999 and bear an annual interest
rate of 10.5%.
 
                                      F-20
<PAGE>   97
                          ABOVENET COMMUNICATIONS INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
        FOR THE PERIOD FROM MARCH 8, 1996 (INCEPTION) TO JUNE 30, 1996,
                    THE YEARS ENDED JUNE 30, 1997 AND 1998,
             AND THE SIX MONTHS ENDED DECEMBER 31, 1998 (UNAUDITED)
 
12. SUBSEQUENT EVENTS (CONTINUED)
On March 27, 1999, the Company granted options to purchase 42,500 shares of
common stock to certain nonemployees, two of whom are members of the Board of
Directors, for services. These options vest over three years, have an exercise
price of $ 85.06 and have a term of three years. The Company will begin to
recognize compensation expense for these options in the quarter ended June 30,
1999.
 
On March 30, 1999, the Company announced a 2-for-1 stock split to be effected as
a stock dividend. The dividend for each outstanding share of common stock will
be payable to stockholders of record as of April 14, 1999 and is expected to be
distributed on May 7, 1999. No share or per share amounts in the financial
statements have been adjusted to give effect of this stock split.
 
In March 1999, the Company, as part of its international expansion strategy,
entered into agreements to form joint ventures in Austria, Germany and the
United Kingdom to provide managed co-location and Internet connectivity
solutions for mission critical Internet operations. The Company has invested a
total of $.6 million in March 1999 and is required to invest an additional $1.9
million in the quarter ending June 30, 1999, for up to a 50% ownership in each
of these joint ventures. In addition, the Company has agreed to provide up to $2
million of additional financing to certain of these joint ventures, if required,
and to arrange or provide for an additional $4.5 million contingent upon the
joint ventures raising an equivalent amount from third parties. These joint
ventures will be accounted for under the equity method of accounting. In
addition, the Company has also agreed to grant options to purchase up to 300,000
shares of common stock to employees of the joint ventures upon meeting certain
annual performance criteria over the next four years.
 
                                      F-21
<PAGE>   98

Narrative Description of Inside Front Cover

Inside Front Cover

Top Center -- [AboveNet logo -- depicting the Company's name inserted through a 
spherical circle]

Caption beneath logo and centered to page: "Global Internet Service Exchange
Strategy"

A world map with North and South America in the center. The United States is
clearly defined by being shaded in blue. To the left is the Asian continent and
Australia. To the right is the European continent. Across the United States map
are two curved lines connecting two ISX facilities, one located on the East and
one located on the West coast of the United States. From the facility on the
West Coast is a series of lines connected to locations in the Asian continent
and Australia. From the facility on the East Coast are three lines connected to
locations in three European countries. 

Below the world map is a box captioned "Existing Customer Connections In:" and
listed below the caption are: Australia, France, Hong Kong, Japan, Korea,
Philippines, Singapore, Taiwan and United Kingdom. 

To the right of the boxes is the following text: "Our objective is to become the
leading global Internet Service Exchange network for Internet content providers,
Web hosting companies and Internet Service Providers that require reliable and
scalable Internet connectivity and co-location services to support their
business critical Internet operations."
<PAGE>   99
Narrative Description of Inside Back Cover

The Inside of the Back Cover shows a series of photographs. The top photograph
is of a room with a series of monitors and computers with a person standing
behind a counter talking to another person in front of the counter. Underneath
the picture is the caption "Internet Service Exchange facility professionally
staffed 24 hours a day, 7 days a week." To the right is a picture that shows
network switching and router units housed in racks. That picture is captioned
"Telecom and Datacom Connectivity." Below is a series of three pictures
captioned "Co-Location Offerings." The left picture shows a person working on a
computer server which is housed in one of the Company's cabinets. The picture is
captioned "Cabriolet Cabinet." The middle picture shows a series of network
servers placed on racks with a person typing on a keyboard housed on one of the
racks. The picture is captioned "Open Rack." To the right is a picture showing a
corridor with cages along the right side. The picture is captioned "Cage." Below
the three pictures is a picture showing a series of power generators with an
individual standing in front of the generators. The picture is captioned
"Redundant Power Systems."

To the right of the bottom picture is the following text: "AboveNet has
developed a network architecture based upon two strategically located, campuses
that combine content co-location services for Internet Content Providers with
direct access to Internet Service Providers to create Internet Service
Exchanges."

                                       2
<PAGE>   100
 
- --------------------------------------------------------------------------------
 
                                      LOGO
 
                                    ABOVENET
                              COMMUNICATIONS INC.
 
                                4,000,000 SHARES
 
                                  COMMON STOCK
 
                          ---------------------------
                                   PROSPECTUS
                          ---------------------------
 
                                           , 1999
 
                               CIBC WORLD MARKETS
                                LEHMAN BROTHERS
                            PAINEWEBBER INCORPORATED
                               VOLPE BROWN WHELAN
                                   & COMPANY
 
- --------------------------------------------------------------------------------
 
YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. NO DEALER,
SALESPERSON OR OTHER PERSON IS AUTHORIZED TO GIVE INFORMATION THAT IS NOT
CONTAINED IN THIS PROSPECTUS. THIS PROSPECTUS IS NOT AN OFFER TO SELL NOR IS IT
SEEKING AN OFFER TO BUY THESE SECURITIES IN ANY JURISDICTION WHERE THE OFFER OR
SALE IS NOT PERMITTED. THE INFORMATION CONTAINED IN THIS PROSPECTUS IS CORRECT
ONLY AS OF THE DATE OF THIS PROSPECTUS, REGARDLESS OF THE TIME OF THE DELIVERY
OF THIS PROSPECTUS OR ANY SALE OF THESE SECURITIES.
<PAGE>   101
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
The following table sets forth the costs and expenses, other than underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of common stock being registered. All amounts are estimates except the SEC
registration fee, the NASD filing fee and the Nasdaq National Market listing
fee.
 
<TABLE>
<CAPTION>
                                                                AMOUNT
                                                              TO BE PAID
                                                              ----------
<S>                                                           <C>
SEC registration fee........................................   $158,000
NASD filing fee.............................................     30,500
Nasdaq National Market listing fee..........................     50,000
Printing and shipping fees..................................    150,000
Legal fees and expenses.....................................    250,000
Accounting fees and expenses................................    125,000
Blue Sky qualification fees and expenses....................      5,000
Transfer agent and registrar fees...........................     10,000
Miscellaneous fees..........................................     21,500
                                                               --------
          Total.............................................   $800,000
                                                               ========
</TABLE>
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
Section 145 of the Delaware General Corporation Law authorizes a court to award
or a corporation's Board of Directors to grant indemnification to directors and
officers in terms sufficiently broad to permit such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act of 1933, as amended (the "Securities
Act"). Article VII, Section 6, of the Registrant's Bylaws provides for mandatory
indemnification of our directors and officers and permissible indemnification of
employees and other agents to the maximum extent permitted by the Delaware
General Corporation Law. The Registrant's Certificate of Incorporation provides
that, pursuant to Delaware law, our directors shall not be liable for monetary
damages for breach of the directors' fiduciary duty as directors to us and our
stockholders. This provision in the Certificate of Incorporation does not
eliminate the directors' fiduciary duty, and in appropriate circumstances
equitable remedies such as injunctive or other forms of non-monetary relief will
remain available under Delaware law. In addition, each director will continue to
be subject to liability for breach of the director's duty of loyalty to us for
acts of omissions not in good faith or involving intentional misconduct, for
knowing violations of law, for actions leading to improper personal benefit to
the director, and for payment of dividends or approval of stock repurchases or
redemptions that are unlawful under Delaware law. The provision also does not
affect a director's responsibilities under any other law, such as the federal
securities laws or state or federal environmental laws. The Registrant has
entered into Indemnification Agreements with our officers and directors, a form
of which is attached as Exhibit 10.1 hereto and incorporated herein by
reference. The Indemnification Agreements provide the Registrant's officers and
directors with further indemnification to the maximum extent permitted by the
Delaware General Corporation Law. Reference is made to Section 7 of the
Underwriting Agreement filed as Exhibit 1.1 hereto, indemnifying officers and
directors of the Registrant against certain liabilities.
 
                                      II-1
<PAGE>   102
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
Since March 8, 1996, the Registrant's predecessor company has issued and sold
the following securities (which numbers do not reflect either the one for two
and one-half exchange effected in connection with our reincorporation into
Delaware the 1-for-1.6 reverse stock split effected in December 1998 or the
2-for-1 stock split to be effected May 7, 1999).
 
 (1) On August 28, 1996, Registrant sold and issued an aggregate of 4,100,000
     shares of Series A preferred stock, at a purchase price of $0.10 per share,
     for cash in the aggregate amount of $410,000 to a group of investors
     pursuant to a Series A preferred stock Purchase Agreement.
 
 (2) On March 14, 1997, Registrant sold and issued an aggregate of 2,000,000
     shares of Series B preferred stock, at a purchase price of $0.30 per share,
     for cash in the aggregate of $600,000 to a group of investors pursuant to a
     Series B preferred stock Purchase Agreement.
 
 (3) On April 30, 1997, Registrant terminated a joint venture agreement with
     DSK, Inc. by issuing 2,000,000 shares of Series B preferred stock.
 
 (4) On August 7, 1997, Registrant issued promissory notes in the principal
     amount of $989,000 and warrants to acquire 1,979,804 shares of Series B
     preferred stock at $0.50 per share. On December 31, 1997, Registrant
     entered into exchange agreements with the noteholders. Pursuant to the
     exchange agreements, the above notes, accrued interest of $21,200 and the
     related warrants were exchanged for (i) 2,527,640 shares of Series B
     preferred stock and (ii) warrants to acquire 494,951 shares of Series B
     preferred stock at $0.50 per share.
 
 (5) On May 11, 1998, Registrant sold and issued an aggregate of 8,012,000
     shares of Series C preferred stock, at a weighted-average purchase price of
     $0.48 per share, for cash in the aggregate amount of $3,882,400 to a group
     of investors pursuant to a Series C preferred stock Purchase Agreement.
 
 (6) On June 30, 1998, Registrant issued promissory notes, in the principal
     amount of $7,000,000, convertible into Series D preferred stock (the
     "Series D Notes") to a group of investors pursuant to a Note Purchase
     Agreement. On July 15, 1998, Registrant sold and issued an aggregate of
     8,461,538 shares of Series D preferred stock, at a purchase price of $1.30
     per share, for cash and cancellation of indebtedness in the aggregate
     amount of $10,999,999.40 to a group of investors pursuant to a Series D
     preferred stock Purchase Agreement. All of the Series D Notes were
     converted into shares of Series D preferred stock on July 15, 1998.
 
 (7) On September 4, 1998, Registrant sold and issued an aggregate of 1,628,000
     shares of Series E preferred stock, at a purchase price of $2.50 per share,
     for cash in the aggregate amount of $4,070,000 to a group of investors
     pursuant to a Series E preferred stock Purchase Agreement. In addition, the
     Registrant issued 7,100 shares of Series E Preferred in consideration for
     placement agent services.
 
 (8) As of October 31, 1998, Registrant has sold and issued 2,086,482 shares of
     our common stock for an aggregate purchase price of $68,288 to employees,
     directors and consultants pursuant to direct issuances and to exercises of
     options under our 1996 and 1997 Stock Option Plans and non-plan options.
 
 (9) During May 1998, Registrant issued warrants for 15,000 shares of common
     stock, with an exercise price of $.50 per share, to Jerry Weissman at Power
     Presentations for services to the Company. During the same time period,
     Registrant issued warrants for 24,375 shares of common stock, with an
     exercise price of $1.00 per share, to DEF Public Relations, Heidrich &
     Struggles and Greg Moyer at Flying Beyond for services to us.
 
(10) During May 1998, Registrant issued warrants, in connection with various
     financing arrangements, to purchase 90,000 shares of common stock, with a
     weighted-average exercise price of $1.15 per share to Transamerica and
     5,000 warrants of Series D preferred stock, with an exercise price of $1.00
     per share to Silicon Valley Bank.
 
                                      II-2
<PAGE>   103
 
(11) In July 1998, Registrant sold and issued warrants for 35,000 shares of our
     common stock, at an exercise price of $1.30 per share, to Primus Technology
     for services in connection with developing Registrant's Asian business
     opportunities. During the same time period, Registrant issued warrants for
     10,000 shares of common stock, at a purchase price of $1.30 per share, for
     cash in the aggregate amount of $500 to Gunderson Dettmer Stough Villeneuve
     Franklin & Hachigian, LLP.
 
(12) In September 1998, Registrant issued warrants to purchase 100,000 shares of
     common stock in connection with a financing arrangement, to TransAmerica
     Business Credit Corporation. The exercise price for 50,000 shares is equal
     to $2.50 per share and the exercise price for the remaining 50,000 shares
     is equal to 80% of the price of this offering or, if this offering is not
     completed, 80% of the price of the next equity financing.
 
(13) In October 1998, we issued warrants with an exercise price equal to $4.00
     per share to purchase 26,250 shares to various consultants in connection
     with the construction of our new Internet service exchange.
 
(14) In December 1998, we issued a warrant to purchase 100,000 shares of common
     stock in connection with a real estate lease to Forest City Enterprises,
     L.L.C. at an exercise price of $10.00 per share (the share numbers and
     exercise price reflect the exchange and reverse stock split).
 
(15) In November 1998, David K. Small exercised options to purchase 15,625
     shares of our common stock for an aggregate purchase price of $1,875 (the
     share numbers and exercise price reflect the exchange and reverse stock
     split).
 
The sale of the above securities was deemed to be exempt from registration under
the Securities Act in reliance upon Section 4(2) of the Securities Act or
Regulation D promulgated thereunder, or Rule 701 promulgated under Section 3(b)
of the Securities Act as transactions by an issuer not involving any public
offering or transactions pursuant to compensation benefit plans and contracts
relating to compensation as provided under such Rule 701. The recipients of
securities in each such transaction represented their intentions to acquire the
securities for investment only and now with a view to or for sale in connection
with any distribution thereof, and appropriate legends were affixed to the share
certificates issued in such transactions. All recipients had adequate access,
through their relationships with the Registrant, to information about the
Registrant.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
(a) Exhibits
 
<TABLE>
<CAPTION>
  EXHIBIT NO.                          DESCRIPTION
  -----------                          -----------
  <S>          <C>
   1.1(5)      Form of Underwriting Agreement.
   3.1(1)      Third Amended and Restated Certificate of Incorporation.
   3.5(1)      Bylaws of Registrant.
   4.2(1)      Form of Registrant's Common Stock Certificate.
   4.3(1)      Amended and Restated Investors' Rights Agreement dated
               September 4, 1998.
   4.4(a)(1)   Stock Subscription Warrant No. 1 to purchase shares of
               Common Stock of Registrant issued to Transamerica Business
               Credit Corporation.
   4.4(b)(1)   Stock Subscription Warrant No. 2 to purchase shares of
               Common Stock of Registrant issued to Transamerica Business
               Credit Corporation.
   4.4(c)(1)   Stock Subscription Warrant No. 3 to purchase shares of
               Common Stock of Registrant issued to Transamerica Business
               Credit Corporation (see Exhibit No. 10.28).
   4.4(d)(1)   Stock Subscription Warrant No. 4 to purchase shares of
               Common Stock of Registrant issued to Transamerica Business
               Credit Corporation (see Exhibit No. 10.28).
   4.5(1)      Warrants to purchase shares of Series D Preferred Stock of
               Registrant issued to Silicon Valley Bank.
   4.6(1)      Form of Warrant to purchase shares of Common Stock of
               Registrant.
</TABLE>
 
                                      II-3
<PAGE>   104
 
<TABLE>
<CAPTION>
  EXHIBIT NO.                          DESCRIPTION
  -----------                          -----------
  <S>          <C>
   5.1(5)      Opinion of Gunderson Dettmer Stough Villeneuve Franklin &
               Hachigian, LLP ("Gunderson Dettmer").
  10.1(1)      Form of Indemnification Agreement entered into by Registrant
               with each of our directors and executive officers.
  10.2(1)      1996 Stock Option Plan.
  10.3(1)      1997 Stock Option Plan.
  10.4(1)      1998 Stock Incentive Plan.
  10.5(1)      1998 Employee Stock Purchase Plan.
  10.6(1)      Employment Agreement between Registrant and Warren J.
               Kaplan.
  10.7(1)      Employment Agreement between Registrant and Sherman Tuan.
  10.8(1)      Employment Agreement between Registrant and David Rand.
  10.9(1)      Stock Option Agreement between Registrant and Warren J.
               Kaplan.
  10.10(1)     Technology Agreement between Registrant and David Rand.
  10.11(1)     Lease Equipment Agreement between Registrant and Cisco
               Systems Capital Corporation.
  10.12(1)     Loan and Security Agreement between Registrant and Silicon
               Valley Bank.
  10.13(1)     Master Loan and Security Agreements between Registrant and
               Transamerica Business Credit Corporation.
  10.14(1)     Promissory Note by Registrant to Transamerica Business
               Credit Corporation.
  10.15(1)     Office Lease between 50 West San Fernando Associates and
               Registrant dated May 15, 1996 (San Jose Office, 10th Floor).
  10.16(1)     First Amendment to Lease Agreement between 50 West San
               Fernando Associates and Registrant, dated December 12, 1996
               (San Jose Office, 10th Floor).
  10.17(1)     Second Amendment to Lease between 50 West San Fernando
               Associates and Registrant, dated February 23, 1998 (San Jose
               Office, 10th Floor).
  10.18(1)     Office Lease between 50 West San Fernando Associates and
               Registrant, dated May 15, 1996 (San Jose Office, 18th
               Floor).
  10.19(1)     First Amendment to Lease Agreement between 50 West San
               Fernando Associates and Registrant, dated December 12, 1996
               (San Jose Office, 18th Floor).
  10.20(1)     Second Amendment to Lease between 50 West San Fernando
               Associates and Registrant, dated February 24, 1998 (San Jose
               Office, 18th Floor).
  10.21(1)     Consent of Landlord between Registrant and Halcyon Software
               California Inc., dated March 31, 1998 (San Jose Office,
               Suite 1012).
  10.22(1)     Consent of Landlord between 50 West San Fernando Associates
               and KPMG Peat Marwick LLP, dated April 6, 1998 and April 12,
               1998 (Registrant sublease from KPMG Peat Marwick LLP, San
               Jose Office, 10th Floor).
  10.23(1)     Sublease between KPMG Peat Marwick (USA) LLP and Registrant,
               dated March 13, 1998 (Registrant sublease from KPMG Peat
               Marwick LLP (USA), San Jose Office, 10th Floor).
  10.24(1)     Deed of Lease between Gosnell Properties, Inc. and
               Registrant dated September 3, 1997 (Suite B-290, Vienna,
               VA/"D.C.").
  10.25(1)     Deed of Lease between Gosnell Properties, Inc. and
               Registrant dated January 30, 1998 (Suite 110, Vienna,
               VA/"D.C.").
  10.26(1)     [New York lease]
  10.27(1)(3)  Fiber Optic Private Network Agreement Product Order between
               Metromedia Fiber Network Services, Inc. and Registrant,
               dated September 1, 1998.
  10.28(1)     Amended and Restated Master Loan and Security Agreement
               between Registrant and Transamerica Business Credit
               Corporation.
  10.29(1)     Loan Modification Agreement between Registrant and Silicon
               Valley Bank dated as of October 26, 1998.
  10.30(1)     Lease by and between F.C. Pavilion, L.L.C. and Registrant
               dated as of December 4, 1998.
</TABLE>
 
                                      II-4
<PAGE>   105
 
<TABLE>
<CAPTION>
  EXHIBIT NO.                          DESCRIPTION
  -----------                          -----------
  <S>          <C>
  10.31(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Capacity
               Purchase Agreement, dated December 23, 1998, by and between
               Atlantic Crossing LTD, a Bermuda corporation, and AboveNet.
  10.32(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Capacity
               Indefeasible Right of Use Agreement in Inland Capacity
               (United Kingdom), dated December 23, 1998, by and between GT
               U.K. LTD and AboveNet.
  10.33(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Indefeasible
               Right of Use 1.1 Agreement in Inland Capacity (United
               States), dated December 23, 1998, by and between GT U.K. LTD
               and AboveNet.
  10.34        Letter Agreement by and between Global Crossing Ltd. and
               Registrant, dated March 23, 1999.(4)
  10.35        Agreement of Lease between 111 Eighth Avenue LLC and
               Registrant, dated January, 1999 (Registrant lease from 111
               Eighth Avenue LLC portion of 2nd Floor, 111 Eighth Ave., New
               York, NY).
  10.36        Shareholders Agreement by and between Raiffeisen
               Rechenzentrum Ges. m.b.H and Registrant, dated March 8,
               1999.(4)
  10.37        Cooperation Agreement, by and between Registrant and
               AboveNet Deutschland GmbH, dated March 25, 1999.(4)
  10.38        Shareholder Agreement relating to AboveNet UK Limited, by
               and between Registrant, Mr. W. Dobbie and Mr. A. MacSween
               and AboveNet UK Limited, dated March, 1999.(4)
  16.1(1)      Letter Regarding Change in Certifying Accountants.
  23.1(5)      Consent of Gunderson Dettmer (included in Exhibit 5.1).
  23.2         Consent of Deloitte & Touche LLP, Independent Accountants.
  23.3         Independent Auditors' Report on Schedule.
  27.1(5)      Financial data schedule.
  99.1(1)      Consent of Forrester Research, Inc.
  99.2(1)      Consent of International Data Corporation.
</TABLE>
 
- -------------------------
(1) Incorporated by reference to the Company's Registration Statement on Form
    S-1 (No. 333-63141) originally filed with the Securities and Exchange
    Commission on September 10, 1998.
 
(2) Incorporated by reference to the Company's filing on Form 10-Q filed with
    the Securities and Exchange Commission on February 11, 1999
 
(3) Confidential treatment granted as to certain portions of exhibit.
 
(4) Confidential treatment requested as to certain portions of exhibit.
 
(5) To be filed by amendment.
 
(b) Financial Statement Schedule
 
  (i) Schedule II. Valuation and Qualifying Accounts.
 
Schedules not listed above have been omitted because the information required to
be set forth therein is not applicable.
 
ITEM 17. UNDERTAKINGS
 
The undersigned Registrant 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 Registrant
pursuant to the Delaware General Corporation Law, the Registrant's Restated
Certificate of Incorporation, the Registrant's Bylaws, and Registrant's
indemnification
 
                                      II-5
<PAGE>   106
 
agreements or otherwise, the Registrant has been advised that in the opinion of
the Securities and Exchange 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 Registrant of expenses incurred or paid by a director,
officer or controlling person of the Registrant 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 hereunder, the
Registrant will, unless in the opinion of our 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 Registrant hereby undertakes that:
 
     (1) For purposes of determining any liability under the Securities Act, the
     information omitted from the form of Prospectus filed as part of this
     Registration Statement in reliance upon Rule 430A and contained in a form
     of Prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
     497(h) under the Securities Act shall be deemed to be part of this
     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-6
<PAGE>   107
 
                                   SIGNATURES
 
Pursuant to the requirements of the Securities Act of 1933, the Registrant has
duly caused this registration statement on Form S-1 to be signed on our behalf
by the undersigned, thereunto duly authorized, in the City of San Jose, State of
California, on this 7th day of April 1999.
 
                                          ABOVENET COMMUNICATIONS INC.
 
                                          By:       /s/ SHERMAN TUAN
                                            ------------------------------------
                                                        Sherman Tuan
                                                 Chairman of the Board and
                                                  Chief Executive Officer
 
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints, jointly and severally, Warren J. Kaplan, Sherman
Tuan and David F. Larson, and each of them, his true and lawful
attorneys-in-fact and agents, each with full power of substitution, for him and
in his name, place and stead, in any and all capacities, to sign any and all
amendments (including post-effective amendments) to this Registration Statement,
and to sign any registration statement for the same offering covered by this
Registration Statement that is to be effective upon filing pursuant to Rule
462(b) promulgated under the Securities Act of 1933, and all post-effective
amendments thereto, and to file the same, with all exhibits thereto and all
others documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or his or
their substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.
 
Pursuant to the requirement of the Securities Act of 1933, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:
 
<TABLE>
<CAPTION>
               NAME AND SIGNATURE                                 TITLE                       DATE
               ------------------                                 -----                       ----
<C>                                               <C>                                    <S>
 
                /s/ SHERMAN TUAN                     Chairman of the Board and Chief     April 7, 1999
- ------------------------------------------------      Executive Officer (Principal
                  Sherman Tuan                       Executive Officer) and Director
 
              /s/ DAVID F. LARSON                    Senior Vice President and Chief     April 7, 1999
- ------------------------------------------------      Financial Officer (Principal
                David F. Larson                            Financial Officer)
 
               /s/ KEVIN HOURIGAN                   Vice President Finance (Principal    April 7, 1999
- ------------------------------------------------           Accounting Officer)
                 Kevin Hourigan
 
            /s/ PETER C. CHEN, PH.D.                   Vice Chairman of the Board        April 7, 1999
- ------------------------------------------------
              Peter C. Chen, Ph.D.
 
              /s/ WARREN J. KAPLAN                 President, Chief Operating Officer    April 7, 1999
- ------------------------------------------------              and Director
                Warren J. Kaplan
 
            /s/ ROBERT A. BURGELMAN                             Director                 April 7, 1999
- ------------------------------------------------
              Robert A. Burgelman
 
               /s/ FRANK R. KLINE                               Director                 April 7, 1999
- ------------------------------------------------
                 Frank R. Kline
</TABLE>
 
                                      II-7
<PAGE>   108
 
<TABLE>
<CAPTION>
               NAME AND SIGNATURE                                 TITLE                       DATE
               ------------------                                 -----                       ----
<C>                                               <C>                                    <S>
                 /s/ JAMES SHA                                  Director                 April 7, 1999
- ------------------------------------------------
                   James Sha
 
              /s/ TOM SHAO, PH.D.                               Director                 April 7, 1999
- ------------------------------------------------
                Tom Shao, Ph.D.
 
              /s/ KIMBALL W. SMALL                              Director                 April 7, 1999
- ------------------------------------------------
                Kimball W. Small
 
               /s/ FRED A. VIERRA                               Director                 April 7, 1999
- ------------------------------------------------
                 Fred A. Vierra
</TABLE>
 
                                      II-8
<PAGE>   109
 
                                                                     SCHEDULE II
 
                       VALUATION AND QUALIFYING ACCOUNTS
 
<TABLE>
<CAPTION>
                                                 BALANCE AT     CHARGED TO                   BALANCE AT
                                                BEGINNING OF     COST AND     DEDUCTIONS/      END OF
                                                   PERIOD        EXPENSES      WRITE-OFF       PERIOD
                                                ------------    ----------    -----------    ----------
<S>                                             <C>             <C>           <C>            <C>
PERIOD FROM MARCH 8, 1996 (INCEPTION)
  TO JUNE 30, 1996
  Accounts receivable allowance...............    $    --        $    --        $    --       $    --
YEAR ENDED JUNE 30, 1997
  Accounts receivable allowance...............    $    --        $15,000        $    --       $15,000
YEAR ENDED JUNE 30, 1998
  Accounts receivable allowance...............    $15,000        $58,787        $13,787       $60,000
</TABLE>
<PAGE>   110
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
  EXHIBIT                                                                  SEQUENTIALLY
  NUMBER                       DESCRIPTION OF DOCUMENT                     NUMBERED PAGE
- -----------                    -----------------------                     -------------
<S>          <C>                                                           <C>
 1.1(5)      Form of Underwriting Agreement.
 3.1(1)      Third Amended and Restated Certificate of Incorporation.
 3.5(1)      Bylaws of Registrant.
 4.2(1)      Form of Registrant's Common Stock Certificate.
 4.3(1)      Amended and Restated Investors' Rights Agreement dated
             September 4, 1998.
 4.4(a)(1)   Stock Subscription Warrant No. 1 to purchase shares of
             Common Stock of Registrant issued to Transamerica Business
             Credit Corporation.
 4.4(b)(1)   Stock Subscription Warrant No. 2 to purchase shares of
             Common Stock of Registrant issued to Transamerica Business
             Credit Corporation.
 4.4(c)(1)   Stock Subscription Warrant No. 3 to purchase shares of
             Common Stock of Registrant issued to Transamerica Business
             Credit Corporation (see Exhibit No. 10.28).
 4.4(d)(1)   Stock Subscription Warrant No. 4 to purchase shares of
             Common Stock of Registrant issued to Transamerica Business
             Credit Corporation (see Exhibit No. 10.28).
 4.5(1)      Warrants to purchase shares of Series D Preferred Stock of
             the Registrant issued to Silicon Valley Bank.
 4.6(1)      Form of Warrant to purchase shares of Common Stock of the
             Registrant.
 5.1(5)      Opinion of Gunderson Dettmer Stough Villeneuve Franklin &
             Hachigian, LLP ("Gunderson Dettmer").
10.1(1)      Form of Indemnification Agreement entered into by Registrant
             with each of our directors and executive officers.
10.2(1)      1996 Stock Option Plan.
10.3(1)      1997 Stock Option Plan.
10.4(1)      1998 Stock Incentive Plan.
10.5(1)      1998 Employee Stock Purchase Plan.
10.6(1)      Employment Agreement between the Registrant and Warren J.
             Kaplan.
10.7(1)      Employment Agreement between the Registrant and Sherman
             Tuan.
10.8(1)      Employment Agreement between the Registrant and David Rand.
10.9(1)      Stock Option Agreement between the Registrant and Warren J.
             Kaplan.
10.10(1)     Technology Agreement between the Registrant and David Rand.
10.11(1)     Lease Equipment Agreement between Registrant and Cisco
             Systems Capital Corporation.
10.12(1)     Loan and Security Agreement between the Registrant and
             Silicon Valley Bank.
10.13(1)     Loan and Security Agreements between the Registrant and
             Transamerica Business Credit Corporation.
10.14(1)     Promissory Note by Registrant to Transamerica Business
             Credit Corporation.
10.15(1)     Office Lease between 50 West San Fernando Associates and
             Registrant dated May 15, 1996 (San Jose Office, 10th Floor).
10.16(1)     First Amendment to Lease Agreement between 50 West San
             Fernando Associates and Registrant, dated December 12, 1996
             (San Jose Office, 10th Floor).
10.17(1)     Second Amendment to Lease between 50 West San Fernando
             Associates and Registrant, dated February 23, 1998 (San Jose
             Office, 10th Floor).
10.18(1)     Office Lease between 50 West San Fernando Associates and
             Registrant, dated May 15, 1996 (San Jose Office, 18th
             Floor).
</TABLE>
<PAGE>   111
 
<TABLE>
<CAPTION>
  EXHIBIT                                                                  SEQUENTIALLY
  NUMBER                       DESCRIPTION OF DOCUMENT                     NUMBERED PAGE
- -----------                    -----------------------                     -------------
<S>          <C>                                                           <C>
10.19(1)     First Amendment to Lease Agreement between 50 West San
             Fernando Associates and Registrant, dated December 12, 1996
             (San Jose Office, 18th Floor).
10.20(1)     Second Amendment to Lease between 50 West San Fernando
             Associates and Registrant, dated February 24, 1998 (San Jose
             Office, 18th Floor).
10.21(1)     Consent of Landlord between Registrant and Halcyon Software
             California Inc., dated March 31, 1998 (San Jose Office,
             Suite 1012).
10.22(1)     Consent of Landlord between 50 West San Fernando Associates
             and KPMG Peat Marwick LLP, dated April 6, 1998 and April 12,
             1998 (Registrant sublease from KPMG Peat Marwick LLP, San
             Jose Office, 10th Floor).
10.23(1)     Sublease between KPMG Peat Marwick (USA) LLP and Registrant,
             dated March 13, 1998 (Registrant sublease from KPMG Peat
             Marwick LLP (USA), San Jose Office, 10th Floor).
10.24(1)     Deed of Lease between Gosnell Properties, Inc. and
             Registrant dated September 3, 1997 (Suite B-290, Vienna,
             VA/"D.C.").
10.25(1)     Deed of Lease between Gosnell Properties, Inc. and
             Registrant dated January 30, 1998 (Suite 110, Vienna,
             VA/"D.C.").
10.26(1)     Network Access Agreement between Goodnet and Registrant
             dated June 11, 1996.
10.27(1)(3)  Fiber Optic Private Network Agreement Product Order between
             Metromedia Fiber Network Services, Inc. and Registrant,
             dated September 1, 1998.
10.28(1)     Amended and Restated Master Loan and Security Agreement
             between Registrant and Transamerica Business Credit
             Corporation.
10.29(1)     Loan Modification Agreement between Registrant and Silicon
             Valley Bank dated as of October 26, 1998.
10.30(1)     Lease by and between F.C. Pavilion, L.L.C. and Registrant
             dated December 4, 1998.
10.31(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Capacity
             Purchase Agreement, dated December 23, 1998, by and between
             Atlantic Crossing LTD, a Bermuda corporation, and AboveNet.
10.32(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Capacity
             Indefeasible Right of Use Agreement in Inland Capacity
             (United Kingdom), dated December 23, 1998, by and between GT
             U.K. LTD and AboveNet.
10.33(2)(3)  Atlantic Crossing/AC-1 Submarine Cable System Indefeasible
             Right of Use 1.1 Agreement in Inland Capacity (United
             States), dated December 23, 1998, by and between GT U.K. LTD
             and AboveNet.
10.34        Letter Agreement by and between Global Crossing Ltd. and
             Registrant, dated March 23, 1999.(4)
10.35        Agreement of Lease between 111 Eighth Avenue LLC and
             Registrant, dated January, 1999 (Registrant lease from 111
             Eighth Avenue LLC portion of 2nd Floor, 111 Eighth Ave., New
             York, NY).
10.36        Shareholders Agreement by and between Raiffeisen
             Rechenzentrum Ges. m.b.H and Registrant, dated March 8,
             1999.(4)
10.37        Cooperation Agreement, by and between Registrant and
             AboveNet Deutschland GmbH, dated March 25, 1999.(4)
10.38        Shareholder Agreement relating to AboveNet UK Limited, by
             and between Registrant, Mr. W. Dobbie and Mr. A. MacSween
             and AboveNet UK Limited, dated March, 1999.(4)
16.1(1)      Letter Regarding Change in Certifying Accountants.
23.1(5)      Consent of Gunderson Dettmer (included in Exhibit 5.1).
</TABLE>
<PAGE>   112
 
<TABLE>
<CAPTION>
  EXHIBIT                                                                  SEQUENTIALLY
  NUMBER                       DESCRIPTION OF DOCUMENT                     NUMBERED PAGE
- -----------                    -----------------------                     -------------
<S>          <C>                                                           <C>
23.2         Consent of Deloitte & Touche LLP, Independent Accountants.
23.3         Independent Auditors' Report on Schedule.
27.1(5)      Financial data schedule.
99.1(1)      Consent of Forrester Research, Inc.
99.2(1)      Consent of International Data Corporation.
</TABLE>
 
- ---------------
(1) Incorporated by reference to the Company's Registration Statement on Form
    S-1 (No. 333-63141) originally filed with the Securities and Exchange
    Commission on September 10, 1998.
 
(2) Incorporated by reference to the Company's filing on Form 10-Q filed with
    the Securities and Exchange Commission on November   , 1998.
 
(3) Confidential treatment granted as to certain portions of exhibit.
 
(4) Confidential treatment requested as to certain portions of exhibit.
 
(5) To be filed by amendment.

<PAGE>   1
                                                                   EXHIBIT 10.34


[LOGO GLOBAL CROSSING]


March 23, 1999

Mr. Dave Rand
CTO
AboveNet Communications
50 W. San Fernando St. #1010
San Jose, CA 95113
USA

Dear Mr. Rand:

This letter confirms our understanding with respect to the sale by Global 
Crossing International Ltd. and/or its affiliates ("GCI") to AboveNet 
Communications, Inc. ("AboveNet") of capacity on GCI's Pan European network 
("PEC").

Purchased Capacity.

GCI hereby agrees to sell (or cause its affiliates to sell) and ABOVENET hereby
agrees to purchase on the RFS Date (to be defined) for PEC [*] (the "Purchased
Capacity") consisting of indefeasible rights of use ("IRUs") for point-to-point
capacity on the following PEC city-to- city segments (GCI PoP to GCI PoP) as
follows:

(1) [*]
(2) [*]
(3) [*]

The aggregate purchase price (the "Purchase Price") for the Purchase Capacity 
shall be [*] provided however, if ABOVENET does not enter into a 
global network offer within [*] days of the date hereof with Global Crossing 
Holdings Ltd. for an [*] the aggregate 
purchase price for the Purchased Capacity shall be increased to [*]. 
The Purchase Price shall be paid as follows (i) [*] of the Purchase Price shall 
be payable on the date this letter agreement is executed by ABOVENET and (ii) 
[*] million shall be payable just prior to activation of the circuit but no 
later than April 30, 1999 (iii) the balance of the Purchase Price shall be 
financed over a [*] period at the rate of [*] with net payable on 
or before December 30, 1999. Interest payments shall be made on the 5th of 
every month. If tail circuits are required to connect the Purchased Capacity to 
ABOVENET's local PoP, GCI agrees to assist ABOVENET in obtaining such 
connectivity, all at ABOVENET's expense.

Maintenance payments shall be payable in accordance with the [*] Capacity 
Purchase Agreement.

Documentation.

ABOVENET and GCI and/or its affiliates shall enter into capacity purchase 
agreements with respect to the Purchased Capacity promptly after the execution 
of this letter agreement, but not later than April 30, 1999.


- --------------
*Certain information on this page has been omitted and filed separately with 
the Commission. Confidential treatment has been requested with respect to the 
omitted portions.
<PAGE>   2
Miscellaneous.

This letter agreement shall be governed by and construed in accordance with the 
laws of the State of New York.

This letter agreement may be executed in any number of counterparts, each of 
which shall be an original, and all of which, when taken together, shall 
constitute one agreement.

This letter agreement may not be amended or waived except in an instrument in 
writing and signed by each of the parties hereto.

This letter agreement shall be binding upon each of the parties hereto and 
their respective successors and permitted assigns. Neither party hereto shall 
be permitted to assign any of their rights or obligations hereunder without the 
other party's prior written consent, provided, however, (i) GCI may assign and 
delegate any and all of its rights and obligations hereunder to its affiliates 
and (ii) ABOVENET may, without relieving it of its obligations hereunder, 
assign its rights hereunder to its wholly-owned subsidiaries.

ABOVENET shall keep the provisions of this letter agreement and any non-public 
information, written or oral, with respect to this Agreement ("Confidential 
Information") confidential and shall not disclose Confidential Information, in 
whole or in part, to any person other than affiliates, officers, directors, 
employees, agents or representatives of ABOVENET (collectively, 
"Representatives") who need to know such Confidential Information for the 
purpose of negotiating, executing and implementing this letter agreement. 
ABOVENET agrees to inform each of its Representatives of the non-public nature 
of the Confidential Information and to direct such persons to treat such 
Confidential Information in accordance with this paragraph. Nothing herein 
shall prevent ABOVENET from disclosing Confidential Information (i) upon the 
order of any court or administrative agency, (ii) upon the request or demand 
of, or pursuant to any regulation of, any regulatory agency or authority or 
(iii) to a party's legal counsel or independent auditors. ABOVENET shall not 
make any public announcement regarding this letter agreement or the terms 
hereof, without the prior written consent of GCI.

If the foregoing correctly sets forth our understanding, please indicate your 
agreement to be bound by the terms hereof by signing in the space indicated 
below.

                                        GLOBAL CROSSING HOLDINGS LTD.


                                        By:       /s/ K. Eugene Shutler
                                           -------------------------------------
                                           Name:  K. Eugene Shutler
                                           Title: President


AGREED AND ACCEPTED:

ABOVENET COMMUNICATIONS, INC.


By:           /s/ Dave Rand
   --------------------------------------
   Name:  Dave Rand
   Title: CTO



                                        Agreement subject to satisfactory
                                        completion of the European ring
                                        agreement before April 2, 1999.
                                        Timeframe may be extended by mutual
                                        consent. Terms are to be no less
                                        favorable on future orders.

                                                                 [initials]

<PAGE>   1
                                                                   EXHIBIT 10.35


     AGREEMENT OF LEASE, made as of January ___, 1999, between 111 EIGHTH AVENUE
LLC, a Delaware limited liability company with an address c/o Taconic Investment
Partners LLC, 1500 Broadway, New York, New York 10036 ("Landlord"), and ABOVENET
COMMUNICATIONS, INC., a Delaware corporation, having an address at 50 West San
Fernando Street, Tenth (10th) Floor, San Jose, California 95113 ("Tenant").

                              W I T N E S S E T H:

     The parties hereto, for themselves, their legal representatives, successors
and assigns, hereby covenant as follows.

                                   DEFINITIONS

     "Additional Rent" means Tenant's Tax Payment, Tenant's Labor Rate Payment,
and any and all other sums, other than Fixed Rent, payable by Tenant to Landlord
under this Lease.


     "Affiliate" means, with respect to any Person, any other Person that,
directly or indirectly, through one or more intermediaries, Controls, is
Controlled by, or is under common Control with, such first Person.

     "Alterations" means alterations, installations, improvements, additions or
other physical changes (other than decorations, movable fixtures and equipment)
in or about the Premises.

     "Base Rate" means the annual rate of interest publicly announced from time
to time by Citibank, N.A., New York, New York (or any successor thereto) as its
"base rate", or such other term as may be used by Citibank, N.A. from time to
time for the rate presently referred to as its base rate.

     "Building" means all the buildings, equipment and other improvements and
appurtenances of every kind and description now located or hereafter erected,
constructed or placed upon the land and any and all alterations, renewals,
replacements, additions and substitutions thereto, presently known by the
address of 111 Eighth Avenue, New York, New York.

     "Building Systems" means the mechanical, electrical, heating, ventilating,
air conditioning, elevator, plumbing, fuel, sanitary, life-safety and other
service systems of the Building, but shall not include the portions of such
systems installed in the Premises by Tenant.

     "Business Days" means all days, excluding Saturdays, Sundays, and all days
observed by either the State of New York, the Federal Government or by the labor
unions servicing the Building as legal holidays.

     "Commencement Date" means the date upon which Landlord delivers possession
of the Premises with Landlord's Work Substantially Completed as provided in
Section 4.2.

<PAGE>   2

     "Control" means: (i) the ownership, directly or indirectly, of more than
fifty per cent (50%) of the voting stock of a corporation, or (ii) the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of such Person.

     "Default Rate" means a rate at all times four (4) percentage points above
the Base Rate.

     "Environmental Laws" means any Legal Requirements now or hereafter in
effect relating to the environment, health, safety or Hazardous Materials.

     "Expiration Date" means the last day of the third (3rd) month immediately
following the fifteenth (15th) anniversary of the Commencement Date.

     "Governmental Authority" means any of the United States of America, the
State of New York, the City of New York, any political subdivision thereof and
any agency, department, commission, board, bureau or instrumentality of any of
the foregoing, now existing or hereafter created, having jurisdiction over the
Real Property or any portion thereof or the curbs, sidewalks, and areas adjacent
thereto.

     "Hazardous Materials" means any substances, materials or wastes regulated
by any Governmental Authority or deemed or defined as a "hazardous substance",
"hazardous material", "toxic substance", "toxic pollutant", "contaminant",
"pollutant", "solid waste", "hazardous waste" or words of similar import under
applicable Legal Requirements, including oil and petroleum products, natural or
synthetic gas, polychlorinated biphenyls, asbestos in any form, urea
formaldehyde, radon gas, or the emission of non-ionizing radiation, microwave
radiation or electromagnetic fields at levels in excess of those (if any)
specified by any Governmental Authority or which may cause a health hazard or
danger to property, or the emission of any form of ionizing radiation.

     "HVAC" means heat, ventilation and air conditioning.

     "Initial Alterations" are defined in Section 4.3.

     "Landlord's Work" is defined in Section 4.2(a).

     "Legal Requirements" means all present and future laws, rules, orders,
ordinances, regulations, statutes, requirements, codes, executive orders, rules
of common law, and any judicial interpretations thereof, extraordinary as well
as ordinary, of all Governmental Authorities, including the Americans with
Disabilities Act (42 U.S.C. Section 12,101 et seq.), New York City Local Law 58
of 1987, and any law of like import, and all rules, regulations and government
orders with respect thereto, and any of the foregoing relating to environmental
matters, Hazardous Materials, public health and safety matters, and of any
applicable fire rating bureau, or other body exercising similar functions,
affecting the Real Property or the maintenance, use or occupation thereof, or
any street or sidewalk comprising a part of or in front thereof or any vault in
or under the same.

     "Mortgage" means any mortgage or trust indenture which may now or hereafter
affect the Real Property, the Building or any Superior Lease and the leasehold
interest created

                                      -2-
<PAGE>   3

thereby, and all renewals, extensions, supplements, amendments, modifications,
consolidations and replacements thereof or thereto, substitutions therefor, and
advances made thereunder; "Mortgagee" means any mortgagee, trustee or other
holder of a Mortgage.

     "Permitted Use" means the use of the Premises by Tenant as an internet
service exchange center and other uses related thereto, including the operation
of incidental technical equipment, and office and support facilities in
connection therewith, and for no other purpose.

     "Person" means any individual, corporation, partnership, limited liability
company, limited liability partnership, joint venture, estate, trust,
unincorporated association, business trust, tenancy-in-common or other entity,
or any Governmental Authority.

     "Premises" means a portion of the second (2nd) floor of the Building, as
shown on the floor plan(s) attached to this Lease as Exhibit A and made a part
hereof.

     "Premises Area" means the Rentable Square Foot area of the Premises,
consisting of a total of 26,846 Rentable Square Feet, as such Premises Area may
be increased or decreased from time to time pursuant to this Lease.

     "Real Property" means the Building, together with the plot of land upon
which it stands.

     "Rent Commencement Date" means the date which is one day prior to the date
which is three (3) calendar months following the Commencement Date.

     "Rentable Square Feet" means the deemed rentable area of the Building or
any portion thereof, computed on the basis of the current standard employed by
Landlord on the date hereof with respect to the calculation of the deemed
Rentable Square Foot area of the Building; provided, however, that in no event
shall such deemed Rentable Square Footage constitute or imply any representation
or warranty by Landlord as to the actual size of any floor or other portion of
the Building, including the Premises.

     "Roof Space" is defined in Section 9.9.

     "Rules and Regulations" means the rules and regulations annexed hereto and
made a part hereof as Exhibit B, and such other and further rules and
regulations as Landlord may from time to time reasonably adopt.

     "Substantial Completion" means, as to any construction performed by any
party in the Premises, including the Initial Alterations, any other Alterations,
or Landlord's Work, that such work has been completed substantially in
accordance with (i) the provisions of this Lease applicable thereto, (ii) the
plans and specifications for such work, and (iii) all applicable Legal
Requirements and Insurance Requirements, except for minor details of
construction, decoration and mechanical adjustments, if any, the noncompletion
of which does not materially interfere with Tenant's use of the Premises, or
which, in accordance with good construction practice, should be completed after
the completion of other work to be performed in the Premises.

                                      -3-
<PAGE>   4

     "Superior Lease(s)" means any ground or underlying lease of the Real
Property or any part thereof heretofore or hereafter made by Landlord and all
renewals, extensions, supplements, amendments and modifications thereof;
"Lessor" means a lessor under a Superior Lease.

     "Tenant Delay" means any delay which results from any act, negligence,
failure to act or omission of any Tenant Party, including delays due to changes
in or additions to, or interference with, any work to be done by Landlord, or
delays by Tenant in submission of information, approving working drawings or
estimates or giving authorizations or approvals.

     "Tenant Party" means any of Tenant, any Affiliate of Tenant, any subtenant
or any other occupant of the Premises, or any of their respective direct or
indirect partners, officers, shareholders, directors, members, trustees,
beneficiaries, employees, principals, contractors, licensees, invitees,
servants, agents or representatives.

     "Tenant's Alterations" means all Alterations, including the Initial
Alterations, in and to the Premises or the Roof Space which may be made by or on
behalf of Tenant prior to and during the Term, or any renewal thereof, including
Tenant's Generators and the switch gear and conduit associated therewith,
distributing equipment, Tenant's HVAC System and related equipment, and
batteries and other uninterruptable power sources ("UPS").

     "Tenant's Property" means Tenant's movable fixtures and movable partitions,
telephone and other communications, electrical components and equipment,
computer systems, furniture, trade fixtures, furnishings and other items of
personal property which are removable without material damage to the Premises or
Building.

     "Term" means the term of this Lease, which shall commence on the
Commencement Date and shall expire on the Expiration Date.

     ARTICLE 1. DEMISE, PREMISES, TERM, RENT

     SECTION 1.1 Landlord hereby leases to Tenant, and Tenant hereby hires from
Landlord, the Premises, for the Term to commence on the Commencement Date and to
end on the Expiration Date, at an annual rent ("Fixed Rent") as follows:

     (a)  Eight Hundred Seventy-Two Thousand Four Hundred Ninety-Five and 00/100
Dollars ($872,495.00) per annum ($72,707.92 per month) for the period commencing
on the Rent Commencement Date and ending one day prior to the third (3rd)
anniversary of the Rent Commencement Date;

     (b)  Nine Hundred Thirty-Nine Thousand Six Hundred Ten and 00/100 Dollars
($939,610.00) per annum ($78,300.83 per month) for the period commencing on the
third (3rd) anniversary of the Rent Commencement Date and ending one day prior
to the sixth (6th) anniversary of the Rent Commencement Date;

     (c)  Nine Hundred Ninety-Three Thousand Three Hundred Two and 00/100
Dollars ($993,302.00) per annum ($82,775.17 per month) for the period commencing
on the

                                      -4-
<PAGE>   5

sixth (6th) the Rent Commencement Date and ending one day prior to the tenth
(10th) anniversary of the Rent Commencement Date; and

     (d)  One Million One Hundred Thousand Six Hundred Eight-Six and 00/100
Dollars ($1,100,686.00) per annum ($91,723.83 per month) for the period
commencing on the tenth (10th) anniversary of the Rent Commencement Date and
ending on the Expiration Date;

which Tenant agrees to pay to Landlord, without notice or demand, in lawful
money of the United States, in monthly installments in advance on the first
(1st) day of each calendar month during the Term, at the office of Landlord or
such other place as Landlord may designate, without any set-off, offset,
abatement or deduction whatsoever. Fixed Rent and Additional Rent shall be
payable by check drawn upon a bank which is a member of the New York
Clearinghouse Association or by wire transfer of immediately available funds.

     SECTION 1.2 Notwithstanding anything to the contrary contained herein, upon
execution and delivery of this lease, Tenant shall pay to Landlord the sum of
Seventy-Two Thousand Seven Hundred Seven and 92/100 Dollars ($72,707.92)
representing the installment of Fixed Rent for the first (1st) full calendar
month of the Term after the Rent Commencement Date. If the Rent Commencement
Date shall occur on a date other than the first (1st) day of any calendar month,
Tenant shall also pay to Landlord, on the Rent Commencement Date, a sum equal to
Two Thousand Four Hundred Twenty-Three and 60/100 Dollars ($2,423.60),
multiplied by the number of calendar days in the period from the Rent
Commencement Date to the last day of the month in which the Rent Commencement
Date shall occur, both inclusive.

     ARTICLE 2. USE AND OCCUPANCY

     SECTION 2.1 Tenant shall use and occupy the Premises for the Permitted Use
and for no other purpose. Tenant shall not use or occupy or permit the use or
occupancy of any part of the Premises in any manner not permitted hereunder, or
which in Landlord's reasonable judgment would adversely affect (a) the proper
and economical rendition of any service required to be furnished to any tenant
or other occupant of the Building, (b) the use or enjoyment of any part of the
Building by any other tenant or other occupant, or (c) the appearance, character
or reputation of the Building.

     SECTION 2.2 Tenant shall not use or permit the Premises or any part thereof
to be used: (a) for the business of printing or other manufacturing of any kind,
(b) as a retail branch of a bank or savings and loan association, or as a retail
loan company, as a retail stock broker's or dealer's office, (c) for the storage
of merchandise, (d) for the distribution, by mail-order or otherwise, of
merchandise, (e) as a restaurant or bar or for the sale of food or beverages,
(f) as a news or cigar stand, (g) as an employment agency, labor union office,
school, physician's or dentist's office, dance or music studio, (h) as a barber
shop or beauty salon, (i) for the sale, at retail or otherwise, of any goods or
products, (j) by the United States Government, the City or State of New York,
any Governmental Authority, any foreign government, the United Nations or any
agency or department of any of the foregoing or any Person having sovereign or
diplomatic immunity, (k) for the rendition of medical, dental or other
therapeutic or diagnostic services, or (l) for the conduct of an auction.

                                      -5-
<PAGE>   6

     SECTION 2.3 (a) Landlord shall not be subject to any liability for failure
to give possession of the Premises on a particular date and the validity of this
Lease shall not be impaired under such circumstances, nor shall the same be
construed to extend the term of this Lease; provided, however, that Landlord
agrees to use commercially reasonable efforts to deliver possession of the
Premises with Landlord's Work Substantially Completed as provided in Section
4.2(a) within ninety (90) days after the date on which this Lease is executed
and delivered to Tenant by Landlord. Notwithstanding the foregoing, if Landlord
fails to deliver possession of the Premises to Tenant with Landlord's Work
Substantially Completed within one hundred eighty (180) days after the date on
which this Lease is executed and delivered to Tenant by Landlord, and such
failure is not due to Unavoidable Delays or Tenant Delays, then as Tenant's sole
and exclusive remedy for such failure to deliver possession of the Premises,
Tenant shall have the right to terminate this Lease by notice to Landlord given
within ten (10) days of such one hundred eighty (180) day period, such
termination to be effective on the date which is ten (10) days after the date
such notice is given, upon which date this Lease shall come to an end and
terminate, subject to the provisions of Section 2.3(b). Landlord shall return
the Security Deposit (as defined in Section 29.1) to Tenant, together with all
prepaid Fixed Rent and Additional Rent, if any, and thereafter neither party
shall have any liability to the other hereunder.

     (b)  Notwithstanding anything to the contrary contained herein, if Tenant
shall give Landlord a notice of termination of this Lease pursuant to Section
2.3(a), and Landlord shall deliver possession of the Premises with Landlord's
Work Substantially Completed to Tenant at any time within ten (10) days
following Landlord's receipt of such notice by Tenant, such termination shall be
void and of no force and effect, and Tenant shall have no further right to
terminate this Lease pursuant to this Section 2.3.

     (c)  The foregoing shall constitute an express negation of Section 223-a of
the New York Real Property Law or any successor law or ordinance, which shall be
inapplicable hereto, and Tenant hereby waives any right to rescind this Lease
which Tenant might otherwise have thereunder.

     ARTICLE 3. ALTERATIONS

     SECTION 3.1 Tenant shall not make any Alterations without Landlord's prior
written consent in each instance, provided that Tenant's changing of wall
coverings, carpeting or paint shall not be deemed to be Alterations requiring
such consent. Landlord's consent shall be granted or denied in Landlord's sole
discretion; provided, however, that Landlord shall not unreasonably withhold its
consent to Alterations proposed to be made by Tenant to adapt the Premises for
the Permitted Use provided that such Alterations (a) are non-structural and do
not affect the Building Systems or services, (b) are performed only by
contractors approved in writing by Landlord, (c) do not affect any part of the
Building other than the Premises, (d) do not adversely affect any service
required to be furnished by Landlord to Tenant or to any other tenant or
occupant of the Building, and (e) do not reduce the value or utility of the
Building. Landlord hereby agrees that Tenant shall have the right to perform the
Alterations described on Exhibit F annexed hereto and made a part hereof, all in
accordance with the provisions of this Article 3.

                                      -6-
<PAGE>   7

     SECTION 3.2 (a) Prior to making any Alterations, Tenant shall (i) submit to
Landlord, for Landlord's written approval, detailed plans and specifications
therefor in form satisfactory to Landlord, (ii) if such Alterations require a
filing with Governmental Authority or require the consent of such authority,
then such plans and specifications shall (A) be prepared and certified by a
registered architect or licensed engineer, and (B) comply with all Legal
Requirements to the extent necessary for such governmental filing or consent,
(iii) at its expense, obtain all required permits, approvals and certificates,
(iv) furnish to Landlord duplicate original policies or certificates of worker's
compensation (covering all persons to be employed by Tenant, and all contractors
and subcontractors supplying materials or performing work in connection with
such Alterations) and comprehensive public liability (including property damage
coverage) insurance and Builder's Risk coverage (issued on a completed value
basis) all in such form, with such companies, for such periods and in such
amounts as Landlord may require, naming Landlord and its employees and agents,
and any Lessor and any Mortgagee as additional insureds, and (v) with respect to
any Alteration costing more than $250,000.00 to complete, furnish to Landlord
such evidence of Tenant's ability to complete and to fully and completely pay
for such Alteration as is satisfactory to Landlord. All Alterations shall be
performed by Tenant at Tenant's sole cost and expense (A) in a good and
workmanlike manner using new materials of first class quality, (B) in compliance
with all Legal Requirements, and (C) in accordance with the plans and
specifications previously approved by Landlord. Tenant shall at its cost and
expense obtain all approvals, consents and permits from every Governmental
Authority having or claiming jurisdiction prior to, during and upon completion
of such Alterations. Tenant shall promptly reimburse Landlord, as Additional
Rent and upon demand, for any and all actual out-of-pocket costs and expenses
incurred by Landlord in connection with Landlord's review of Tenant's plans and
specifications for any such Alteration.

     (b)  Landlord shall not unreasonably withhold, condition or delay its
approval of the contractors proposed to be used by Tenant for Tenant's
Alterations, provided that in the case of the mechanical, electrical, plumbing
and fire safety trades, Tenant shall select its contractors and sub-contractors
from Landlord's list of approved contractors. Attached hereto as Exhibit C is a
list of contractors currently approved by Landlord for the performance of work
in the Building, which list may be modified by Landlord from time to time.

     (c)  Landlord agrees to respond to any written request for approval of
plans and specifications for Alterations proposed to be made by Tenant within
ten (10) Business Days after receipt by Landlord of complete and detailed
architectural, structural, mechanical and engineering plans and specifications
as required for such Alterations (collectively, "Tenant's Plans"). If Landlord
fails to approve or disapprove Tenant's Plans on or before the end of the
applicable review period set forth herein, Tenant shall have the right to
provide Landlord with a second written request for approval (a "Second
Request"), which shall specifically identify Tenant's Plans to which such
request relates, and set forth in bold capital letters the following statement:
IF LANDLORD FAILS TO RESPOND WITHIN FIVE (5) BUSINESS DAYS AFTER RECEIPT OF THIS
NOTICE, THEN TENANT SHALL BE ENTITLED TO COMMENCE CONSTRUCTION IN ACCORDANCE
WITH THE PLANS AND SPECIFICATIONS PREVIOUSLY SUBMITTED TO LANDLORD AND TO WHICH
LANDLORD HAS FAILED TO TIMELY RESPOND. In the event that Landlord fails to
respond to a Second Request within five (5) Business Days after receipt by
Landlord, Tenant's Plans or revisions thereto for which the Second Request is
submitted shall be deemed to be

                                      -7-
<PAGE>   8

approved by Landlord, and Tenant shall be entitled to commence construction of
the Alteration or portion thereof to which Tenant's Plans relate, provided that
Tenant's Plans have been appropriately filed in accordance with applicable Legal
Requirements, all permits and approvals required to be issued by any
Governmental Authority shall have been duly issued, and Tenant shall otherwise
have complied with all provisions of this Lease applicable to Alterations.

     (d)  Notwithstanding the foregoing provisions of this Article 3, Tenant
shall be permitted to make minor, non-structural alterations to the Premises
("Minor Alterations") upon prior notice to Landlord, but without the necessity
of procuring Landlord's consent thereto, provided that the estimated cost of
each such Minor Alteration does not exceed $100,000.00 in any one instance. The
provisions of Sections 3.2(a) and (b) shall be applicable to Minor Alterations.
Prior to commencing any Minor Alteration, Tenant shall furnish Landlord with (i)
working drawings or plans for such Minor Alteration in sufficient detail to
permit Landlord to determine that such Alteration complies with the requirements
hereof, and (ii) the names of the contractors proposed to be used by Tenant for
such Minor Alteration.

     (e)  Upon completion of any Alterations, Tenant, at its expense, shall
promptly obtain certificates of final approval of such Alterations as may be
required by any Governmental Authority, and shall furnish Landlord with copies
thereof, together with "as-built" plans and specifications for such Alterations
prepared on an Autocad Computer Assisted Drafting and Design System (or such
other system or medium as Landlord may accept) using naming conventions issued
by the American Institute of Architects in June, 1990 (or such other naming
convention as Landlord may accept) and magnetic computer media of such record
drawings and specifications, translated into DXF format or another format
acceptable to Landlord.

     SECTION 3.3 All Alterations in and to the Premises or the Roof Space which
may be made by or on behalf of Tenant, prior to and during the Term or any
renewal thereof, shall become the property of Landlord upon the Expiration Date
or sooner termination of this Lease, and upon the Expiration Date or earlier
termination of the Term or any renewal thereof (a) Tenant shall remove Tenant's
Property from the Premises (but in no event shall Tenant have the right or
obligation to remove Tenant's Generators and the switch gear and conduit
associated therewith), and (b) unless Landlord notifies Tenant no later than
twenty (20) days prior to the Expiration Date that any or all items of Tenant's
Alterations shall not be removed from the Premises, Tenant shall remove Tenant's
Alterations from the Premises, at Tenant's sole cost and expense; provided,
however, that Tenant shall have no obligation to remove those portions of
Tenant's Alterations consisting of only ordinary and standard office
installations. Tenant shall repair and restore in a good and workmanlike manner
(reasonable wear and tear excepted) any damage to the Premises and the Building
caused by such removal of Tenant's Property and/or Tenant's Alterations. Any of
Tenant's Alterations or Tenant's Property not so removed by Tenant at or prior
to the Expiration Date or earlier termination of the Term shall be deemed
abandoned and may, at the election of Landlord, either be retained as Landlord's
property or be removed from the Premises by Landlord at Tenant's expense. The
covenants and agreements set forth in this Section 3.3 shall survive the
expiration or earlier termination of this Lease.

     SECTION 3.4 If, because of any act or omission of Tenant, its employees,
agents, contractors, or subcontractors, any mechanic's lien, U.C.C. financing
statement or other lien, charge or order for the payment of money shall be filed
against Landlord, or against all or any

                                      -8-
<PAGE>   9

portion of the Premises, the Building or the Real Property, Tenant shall, at its
own cost and expense, cause the same to be discharged of record, by bonding or
otherwise, within thirty (30) days after the filing thereof, and Tenant shall
indemnify, defend and save Landlord harmless against and from all costs,
expenses, liabilities, suits, penalties, claims and demands (including
reasonable attorneys' fees and disbursements) resulting therefrom.

     SECTION 3.5 Tenant shall not, at any time prior to or during the Term,
directly or indirectly employ, or permit the employment of, any contractor,
mechanic or laborer in the Premises, whether in connection with any Alteration
or otherwise, if in Landlord's sole judgment such employment will materially
interfere or cause any conflict with other contractors, mechanics, or laborers
engaged in the construction, maintenance or operation of the Building by
Landlord, Tenant or others, or materially and adversely affect the use and
enjoyment of other tenants or occupants of the Building.

     ARTICLE 4. CONDITION OF THE PREMISES; LANDLORD'S WORK

     SECTION 4.1 Tenant has examined the Premises and, subject to the completion
of Landlord's Work as set forth herein, agrees to accept possession of the
Premises in their "as is" condition on the Commencement Date, and further agrees
that, except for the performance of Landlord's Work as expressly set forth in
this Article 4, Landlord shall have no obligation to perform any work, supply
any materials, incur any expenses or make any installations in order to prepare
the Premises for Tenant's occupancy. The taking of possession of the Premises by
Tenant shall be conclusive evidence as against Tenant that at the time such
possession was so taken, the Premises were in good and satisfactory condition,
subject to the provisions of Section 4.2.

     SECTION 4.2 Prior to the Commencement Date, Landlord shall perform the
following work at the Premises, at Landlord's sole cost and in accordance with
all Legal Requirements ("Landlord's Work"): (i) demolish all existing
improvements, including piping and electrical conduit, which are then
permanently out of service, (ii) abate or encapsulate any asbestos or
asbestos-containing materials ("ACM") within the Premises in accordance with all
Legal Requirements, and provide Tenant with a New York City Department of
Environmental Protection Form ACP-5 in connection therewith, and (iii) demise in
a Building standard manner and deliver the Premises in broom clean condition.

     SECTION 4.3 Landlord acknowledges that Tenant intends to perform certain
Alterations in order to prepare the Premises for its occupancy, which
alterations shall include (i) the installation of a sprinkler system or other
fire suppression system satisfactory to Landlord, and (ii) the installation of
noise suppression materials and/or equipment with respect to Tenant's
telecommunications equipment and any Roof Equipment and Tenant's HVAC Equipment,
satisfactory to Landlord, all in compliance with Legal Requirements (the
"Initial Alterations").

     SECTION 4.4 Upon the request of Tenant, Landlord, at Tenant's cost and
expense, shall join in any applications for any permits, approvals or
certificates from any Governmental Authority required to be obtained by Tenant,
and shall sign such applications reasonably promptly after request by Tenant
(provided that (i) the provisions of the applicable Legal Requirement shall
require that Landlord join in such application, and (ii) such application

                                      -9-
<PAGE>   10

is reasonably acceptable to Landlord) and shall otherwise cooperate with Tenant
in connection therewith, provided that Landlord shall not be obligated to incur
any cost or expense, including attorneys' fees and disbursements, or suffer or
incur any liability, in connection therewith.

     ARTICLE 5. REPAIRS; FLOOR LOAD

     SECTION 5.1 (a) Landlord shall maintain in working order and shall repair
the Building Systems and the public portions of the Building, both exterior and
interior, and the structural elements thereof, including the roof, foundation
and curtain wall. Tenant, at Tenant's expense, shall take good care of the
Premises and the fixtures, systems, equipment and appurtenances therein, and
make all non-structural repairs thereto as and when needed to preserve them in
good working order and condition, except for reasonable wear and tear,
obsolescence and damage for which Tenant is not responsible pursuant to the
provisions of Articles 10 and 11. Notwithstanding the foregoing, but subject to
the provisions of Section 10.2(b), all damage or injury to the Premises or to
any other part of the Building, or to its fixtures, equipment and appurtenances,
caused by or resulting from carelessness, omission, neglect or improper conduct
of, or Alterations made by Tenant, Tenant's agents, employees or licensees,
shall be repaired at Tenant's expense, (i) by Tenant to the satisfaction of
Landlord (if the required repairs are non-structural and do not affect any
Building System), or (ii) by Landlord (if the required repairs are structural or
affect any Building System). Tenant also shall repair all damage to the Building
and the Premises caused by the making of any Alterations by Tenant or by the
moving of Tenant's Property. All of such repairs shall be of quality or class
equal to the original work or construction. If Tenant fails after fifteen (15)
days notice to proceed with due diligence to make repairs required to be made by
Tenant, Landlord may make such repairs at the expense of Tenant, and Tenant
shall pay the costs and expenses thereof incurred by Landlord, with interest at
the Default Rate, as Additional Rent within ten (10) days after rendition of a
bill or statement therefor.

     (b)  Landlord represents to Tenant that, to the best of Landlord's
knowledge, all Building Systems for which Landlord is responsible under this
Lease, including elevators, heating systems and life safety systems, will remain
fully functional and perform their normal operations on and after January 1,
2000, without interruption or malfunction as a result of the passage from the
year 1999 to the year 2000. Landlord shall make all repairs, alterations or
replacements to any Building Systems in order to prevent or eliminate any such
interruptions or malfunctions resulting from the passage from the year 1999 to
the year 2000.

     SECTION 5.2 Tenant shall not place a load upon any floor of the Premises
exceeding the floor load per square foot which such floor was designed to carry
and which is allowed by law, which floor load is stated in the certificate of
occupancy for the Building in effect on the date of this Lease to be 200 pounds
per square foot. Tenant shall not move any safe, heavy equipment, business
machines, freight, bulky matter or fixtures into or out of the Building without
Landlord's prior consent. If such safe, equipment, freight, bulky matter or
fixtures requires special handling, Tenant shall employ only persons holding a
Master Rigger's license to do such work.

     SECTION 5.3 Except as expressly set forth herein, there shall be no
allowance to Tenant for a diminution of rental value, no constructive eviction
of Tenant and no liability on the

                                      -10-
<PAGE>   11

part of Landlord by reason of inconvenience, annoyance or injury to business
arising from Landlord making, or failing to make, any repairs, alterations,
additions or improvements in or to any portion of the Building or the Premises,
or in or to fixtures, appurtenances or equipment thereof. Landlord shall use
reasonable efforts to minimize interference with Tenant's access to and use and
occupancy of the Premises in making any repairs, alterations, additions or
improvements; provided, however, that Landlord shall have no obligation to
employ contractors or labor at overtime or other premium pay rates or to incur
any other overtime costs or additional expenses whatsoever, unless Tenant
requests the use of such overtime labor and agrees to pay the additional costs
for such overtime labor to Landlord upon demand.

     SECTION 5.4 Notwithstanding anything to the contrary contained in any other
provision of this Lease, in the event that (a) Tenant is unable to use the
Premises for the ordinary conduct of Tenant's business due to Landlord's breach
of its obligations under this Lease to provide services, perform repairs, or
comply with Legal Requirements, in each case other than as a result of
Unavoidable Delays or Tenant Delays, and such condition continues for a period
in excess of ten (10) consecutive days (or, if Tenant's inability to use the
Premises or portion thereof results, in whole or in part, from Unavoidable
Delays and such condition continues for a period in excess of thirty (30)
consecutive days) after Tenant gives a notice to Landlord (the "Abatement
Notice") stating that Tenant's inability to use the Premises is solely due to
such condition, (b) Tenant does not actually use or occupy the Premises or such
portion thereof during such period, and (c) such condition has not resulted from
the negligence or misconduct of Tenant or any Tenant Party, then Fixed Rent,
Tenant's Tax Payment and Tenant's Operating Payment shall be abated as to the
Premises on a per diem basis for the period commencing on the tenth (10th) day
(or thirtieth (30th) day, if such condition results, in whole or in part, from
Unavoidable Delays, as the case may be) after Tenant gives the Abatement Notice,
and ending on the earlier of (i) the date Tenant reoccupies the Premises for the
ordinary conduct of its business, or (ii) the date on which such condition is
substantially remedied and Landlord has notified Tenant thereof.

     SECTION 5.5 Tenant shall not require, permit, suffer or allow the cleaning
of any window in the Premises from the outside in violation of Section 202 of
the New York Labor Law or any successor statute thereto, or of any other Legal
Requirement.

     ARTICLE 6. REAL ESTATE TAXES AND LABOR RATE INCREASES

     SECTION 6.1 The following terms shall have the meanings set forth below:

     (a)  "Taxes" shall include the aggregate amount of (i) all real estate
taxes, assessments (special or otherwise), sewer and water rents, rates and
charges and any other governmental levies, impositions or charges, whether
general, special, ordinary, extraordinary, foreseen or unforeseen, which may be
assessed, levied or imposed upon all or any part of the Real Property, and (ii)
any expenses (including reasonable attorneys' fees and disbursements and
experts' and other witness' fees) incurred in contesting any of the foregoing or
the Assessed Valuation (as defined in Section 6.1(d)) of all or any part of the
Real Property. If at any time after the date hereof the methods of taxation
prevailing at the date hereof shall be altered so that in lieu of or as an
addition to or as a substitute for the whole or any part of the taxes,
assessments, rents, rates, charges, levies or impositions now assessed, levied
or imposed upon all

                                      -11-
<PAGE>   12

or any part of the Real Property, there shall be assessed, levied or imposed (A)
a tax, assessment, levy, imposition or charge based on the rents received
therefrom whether or not wholly or partially as a capital levy or otherwise, (B)
a tax, assessment, levy, imposition or charge measured by or based in whole or
in part upon all or any part of the Real Property and imposed upon Landlord, (C)
a license fee measured by the rents or (D) any other tax, assessment, levy,
imposition, charges or license fee however described or imposed, then all such
taxes, assessments, levies, impositions, charges or license fees or the part
thereof so measured or based shall be deemed to be Taxes; provided, however,
that any such taxes, fees or charges which are in addition to taxes otherwise
payable under this Section 6.1 shall only be deemed Taxes if such taxes shall
generally be treated in other commercial buildings in New York City as
constituting real estate taxes for the purpose of calculating similar lease tax
escalation provisions. Taxes shall not include franchise, gift, inheritance,
estate, sales, income or profit taxes or any late charges or penalties imposed
upon Landlord, any Lessor or any Mortgagee by any Governmental Authority.

     (b)  "Tenant's Share" means one and 17/100 percent (1.17%).

     (c)  "Base Tax Year" means the Tax Year commencing on July 1, 1999 and
ending June 30, 2000.

     (d)  "Assessed Valuation" means the amount for which the Real Property is
assessed pursuant to applicable provisions of the New York City Charter and of
the Administrative Code of the City of New York for the purpose of imposition of
Taxes.

     (e)  "Tax Year" means the period July 1 through June 30 (or such other
period as may be duly adopted by the City of New York as its fiscal year for
real estate tax purposes).

     (f)  "Base Taxes" means an amount equal to the Taxes payable on account of
the Base Tax Year.

     (g)  "Comparison Year" means (i) with respect to Taxes, any Tax Year
commencing subsequent to the Base Tax Year, and (ii) with respect to Labor
Rates, any calendar year commencing subsequent to the Base Labor Year.

     (h)  "Landlord's Statement" means an instrument or instruments containing a
comparison of either (i) the Base Taxes and the Taxes payable for any Comparison
Year, or (ii) the Base Labor Rates and the Labor Rates applicable to any
Comparison Year.

     (i)  "Tenant's Projected Share of Taxes" means Tenant's Tax Payment (as
defined in Section 6.1(j)), if any, made by Tenant for the prior Comparison
Year, plus an amount equal to Landlord's reasonable estimate of the amount of
increase in Tenant's Tax Payment for the then current Comparison Year, divided
by twelve (12) and payable monthly by Tenant to Landlord as Additional Rent.

     (j)  "Tenant's Tax Payment" means Tenant's Share of the excess of the Taxes
payable for any Comparison Year over the Base Taxes.

     SECTION 6.2 (a) If the Taxes payable for any Comparison Year (any part or
all of which falls within the Term) shall exceed the Base Taxes, Tenant shall
pay Tenant's Tax

                                      -12-
<PAGE>   13

Payment to Landlord, as Additional Rent, within ten (10) Business Days after
demand from Landlord therefor, which demand shall be accompanied by Landlord's
Statement. Before or after the start of each Comparison Year, Landlord shall
furnish to Tenant a Landlord's Statement in respect of Taxes. If there shall be
any increase in Taxes payable for any Comparison Year, whether during or after
such Comparison Year or if there shall be any decrease in the Taxes payable for
any Comparison Year during such Comparison Year, Landlord may furnish a revised
Landlord's Statement for such Comparison Year, and Tenant's Tax Payment for such
Comparison Year shall be adjusted and, within ten (10) Business Days after
Tenant's receipt of such revised Landlord's Statement, Tenant shall (i) with
respect to any increase in Taxes payable for such Comparison Year, pay such
increase in Tenant's Tax Payment to Landlord, or (ii) with respect to any
decrease in Taxes payable for such Comparison Year, Landlord shall credit such
decrease in Tenant's Tax Payment against the next installment of Tenant's Share
of Taxes payable by Tenant pursuant to this Section 6.2(a), provided that if
such decrease in Taxes is attributable to the final Comparison Year of the Term,
Landlord shall pay the amount of such decrease in Tenant's Tax Payment to
Tenant. If, during the Term, Landlord shall elect to collect Tenant's Tax
Payments in full or in quarterly or bi-annual or other installments on any other
date or dates than as presently required, then following Landlord's notice to
Tenant, Tenant's Tax Payments shall be correspondingly revised. The benefit of
any discount for any early payment or prepayment of Taxes relating to all or any
part of the Real Property shall accrue solely to the benefit of Landlord and
Taxes shall be computed without subtracting such discount.

     (b)  With respect to each Comparison Year, on account of which Landlord
shall (or anticipates that it may) be entitled to receive Tenant's Tax Payment,
Tenant shall pay to Landlord, as Additional Rent for the then current Tax Year,
Tenant's Projected Share of Taxes. Upon each date that a Tax Payment or an
installment on account thereof shall be due from Tenant pursuant to the terms of
this Section 6.2, Landlord shall apply the aggregate of the installments of
Tenant's Projected Share of Taxes then on account with Landlord against Tenant's
Tax Payment or installment thereof then due from Tenant. In the event that such
aggregate amount shall not be sufficient to discharge such Tax Payment or
installment, Landlord shall so notify Tenant, and the amount of Tenant's payment
obligation with respect to such Tax Payment or installment pursuant to this
Section 6.2, shall be equal to the amount of the insufficiency and shall be
payable within ten (10) Business Days of demand by Landlord. If, however, such
aggregate amount shall be greater than the Tax Payment or installment, Landlord
shall credit the amount of such excess against the next payment of Tenant's
Projected Share of Taxes due hereunder.

     (c)  Only Landlord shall be eligible to institute Tax reduction or other
proceedings to reduce the Assessed Valuation of the Real Property, and the
filings of any such proceeding by Tenant without Landlord's prior written
consent shall constitute a default hereunder. If the Taxes payable for the Base
Tax Year are reduced by final determination of legal proceedings, settlement or
otherwise, then Base Taxes shall be correspondingly revised, the Additional Rent
theretofore paid or payable on account of Tenant's Tax Payment hereunder for all
Comparison Years shall be recomputed on the basis of such reduction, and Tenant
shall pay to Landlord, as Additional Rent within ten (10) Business Days after
receipt of a bill therefor, any deficiency between the amount of such Additional
Rent theretofore computed and paid by Tenant to Landlord and the amount thereof
due as a result of such recomputations. If the Taxes payable for the Base Tax
Year are increased by such final determination of legal proceedings, settlement

                                      -13-
<PAGE>   14

or otherwise, then, Landlord shall either pay to Tenant, or at Landlord's
election, credit against subsequent payments due under this Section 6.2, an
amount equal to the excess of the amounts of such Additional Rent theretofore
paid by Tenant over the amount thereof actually due as a result of such
recomputations. If Landlord shall receive a refund or reduction of Taxes for any
Comparison Year, Landlord shall, within a reasonable time after such refund is
actually received or such credit is actually applied against Taxes then due and
payable, either pay to Tenant, or, at Landlord's election, credit against
subsequent payments under this Section 6.2, an amount equal to Tenant's Share of
the refund or reduction, provided that such amount shall not exceed Tenant's Tax
Payment paid for such Comparison Year. Nothing herein contained shall obligate
Landlord to file any application or institute any proceeding seeking a reduction
in Taxes or Assessed Valuation.

     (d)  Tenant's Tax Payment shall be made as provided in this Section 6.2
regardless of the fact that Tenant may be exempt, in whole or in part, from the
payment of any taxes by reason of Tenant's diplomatic or other tax exempt status
or for any other reason whatsoever.

     (e)  Without duplication of any amounts payable on account of Taxes, Tenant
shall pay to Landlord, as Additional Rent upon demand, any Commercial Rent or
Occupancy Tax imposed pursuant to Title 11, Chapter 7 of the New York City
Administrative Code or any successor statute hereafter enacted, if payable by
Landlord in the first instance or hereafter required to be paid by Landlord.

     (f)  If the Commencement Date or the Expiration Date shall occur on a date
other than July 1 or June 30, respectively, any Additional Rent payable by
Tenant to Landlord under this Section 6.2 for the Comparison Year in which such
Commencement Date or Expiration Date shall occur, shall be apportioned in that
percentage which the number of days in the period from the Commencement Date to
June 30 or from July 1 to the Expiration Date, as the case may be, both
inclusive, shall bear to the total number of days in such Comparison Year. In
the event of a termination of this Lease, any Additional Rent under this Section
6.2 shall be paid or adjusted within thirty (30) days after submission of
Landlord's Statement. In no event shall Fixed Rent ever be reduced by operation
of this Section 6.2 and the rights and obligations of Landlord and Tenant under
the provisions of this Section 6.2 with respect to any Additional Rent shall
survive the expiration or earlier termination of this Lease.

     SECTION 6.3 The following terms shall have the meanings set forth below:

     (a)  "Comparison Year" shall mean any calendar year subsequent to the Base
Labor Year.

     (b)  "R.A.B." shall mean the Realty Advisory Board on Labor Relations,
Incorporated, or its successor.

     (c)  "Local 32B-32J" shall mean Local 32B-32J of the Building Service
Employees International Union, AFL-CIO, or its successor.

                                      -14-
<PAGE>   15

     (d)  "Class A Office Buildings" shall mean office buildings so categorized
under any agreement between R.A.B. and Local 32B-32J, regardless of the
designation given to such office buildings in any such agreement.

     (e)  "Labor Rates" shall mean a sum equal to the regular hourly wage rate
required to be paid to Others (hereinafter defined) employed in Class A Office
Buildings pursuant to an agreement between R.A.B. and Local 32B-32J; provided,
however, that:

          (i) if, as of October 1st of any Comparison Year, any such agreement
     shall require Others in Class A Office Buildings to be regularly employed
     on days or during hours when overtime or other premium pay rates are in
     effect pursuant to such agreement, then the term "regular hourly wage
     rate", as used in this Section 6.3 shall mean the average hourly wage rate
     for the hours in a calendar week during which Others are required to be
     regularly employed;

          (ii) if no such agreement is in effect as of October 1st of any
     Comparison Year with respect to Others, then the term "regular hourly wage
     rate", as used in this Section 6.3 shall mean the regular hourly wage rate
     actually paid to Others employed in the Building by Landlord or by an
     independent contractor engaged by Landlord; and

          (iii) the term "regular hourly wage rate" in all events shall exclude
     payments and benefits directly to taxing authorities or others on account
     of the employment and all welfare, pension and fringe employee benefits and
     payments of any kind paid or given pursuant to such agreement.

     (f)  "Others" shall mean that classification of employee engaged in the
general maintenance and operation of Class A Office Buildings most nearly
comparable to the classification now applicable to "others" in the current
agreement between R.A.B. and Local 32B-32J.

     (g)  "Base Labor Year" shall mean the calendar year 1999.

     (h)  "Base Labor Rates" shall mean the Labor Rates in effect for the Base
Labor Year.

     (i)  "Tenant's Labor Rate Payment" is defined in Section 6.4(a).

     SECTION 6.4 (a) If the Labor Rates in effect for any Comparison Year (any
part or all of which falls within the Term) shall be greater than the Base Labor
Rates, then Tenant shall pay, as Additional Rent for such Comparison Year and
continuing thereafter until a new Landlord's Statement is rendered to Tenant, an
amount ("Tenant's Labor Rate Payment") equal to (i) 26,846 multiplied by (ii)
the number of cents (inclusive of any fractions of a cent) by which the Labor
Rates in effect for such Comparison Year exceed the Base Labor Rates, multiplied
by (iii) eighty percent (80%).

     (b)  At any time prior to, during or after any Comparison Year Landlord
shall render to Tenant a Landlord's Statement showing (i) a comparison of the
Labor Rates for the

                                      -15-
<PAGE>   16

Comparison Year with the Base Labor Rates, and (ii) the amount of Tenant's Labor
Rate Payment resulting from such comparison. Landlord's failure to render a
Landlord's Statement during or with respect to any Comparison Year shall not
prejudice Landlord's right to render a Landlord's Statement during or with
respect to any subsequent Comparison Year and shall not eliminate or reduce
Tenant's obligation to pay Tenant's Labor Rate Payment pursuant to this Article
6 for such Comparison Year.

     (c)  Tenant's Labor Rate Payment shall be payable by Tenant on the first
day of the month following the furnishing to Tenant of a Landlord's Statement,
in equal monthly installments, each such installment to be equal to 1/12th of
Tenant's Labor Rate Payment for such Comparison Year multiplied by the number of
months (and any fraction thereof) of the Term then elapsed since the
commencement of such Comparison Year, continuing monthly thereafter until
rendition of the next succeeding Landlord's Statement.

     (d)  The provisions of this Section 6.4 shall be effective irrespective of
whether or not (i) the Building is classified as a Class A office building from
time to time, or (ii) any Building employees are members of Local 32B-32J.
Tenant acknowledges and agrees that the computation of Labor Rates hereunder is
intended to serve solely as a formula for an agreed rental adjustment, rather
than an actual operating expense calculation, and is not intended to reflect the
actual cost to Landlord of wages at the Building or any increases or decreases
in such cost.

     SECTION 6.5 (a) If the Commencement Date or the Expiration Date shall occur
on a date other than January 1 or December 31, respectively, any Additional Rent
under this Article 6 for the Comparison Year in which such Commencement Date or
Expiration Date shall occur shall be apportioned in that percentage which the
number of days in the period from the Commencement Date to December 31 or from
January 1 to the Expiration Date, as the case may be, both inclusive, shall bear
to the total number of days in such Comparison Year. In the event of a
termination of this Lease, any Additional Rent under this Article shall be paid
or adjusted within thirty (30) days after submission of a Landlord's Statement.
In no event shall Fixed Rent ever be reduced by operation of this Section 6.5
and the rights and obligations of Landlord and Tenant under the provisions of
this Article 6 with respect to any Additional Rent shall survive the expiration
or earlier termination of this Lease.

     (b)  The computations of Additional Rent under this Article 6 are intended
to constitute a formula for an agreed rental adjustment and may or may not
constitute an actual reimbursement to Landlord for costs and expenses paid by
Landlord with respect to the Building.

     SECTION 6.6 Landlord's failure to render a Landlord's Statement with
respect to any Comparison Year shall not prejudice Landlord's right to
thereafter render a Landlord's Statement with respect thereto or with respect to
any subsequent Comparison Year, nor shall the rendering of a Landlord's
Statement prejudice Landlord's right to thereafter render a corrected Landlord's
Statement for that Comparison Year. Nothing herein contained shall restrict
Landlord from issuing a Landlord's Statement at any time there is an increase in
Taxes or Labor Rates during any Comparison Year or any time thereafter.

                                      -16-
<PAGE>   17

     SECTION 6.7 If any capital improvement is made to the Real Property during
any calendar year during the Term in compliance with any Legal Requirements
enacted or imposed subsequent to the date of this Lease (including
reinterpretations or new rules or regulations applicable to existing Legal
Requirements), then Tenant shall pay to Landlord, immediately upon demand
therefor, Tenant's Proportionate Share of the reasonable annual amortization,
with interest, of the cost of such improvement in each calendar year during the
Term during which such amortization occurs.

     ARTICLE 7. LEGAL REQUIREMENTS

     SECTION 7.1 Tenant, at its sole expense, shall comply with all Legal
Requirements applicable to the Premises or the use and occupancy thereof by
Tenant, and make all repairs or Alterations required thereby, whether structural
or nonstructural, ordinary or extraordinary; provided, however, that Tenant
shall not be obligated to comply with any Legal Requirement requiring any
structural Alteration to the Premises unless the application of such Legal
Requirement arises from (i) Tenant's manner of use or occupancy of the Premises
(as distinguished from the use or occupancy of the Premises as executive and
general offices), (ii) any cause or condition created by or on behalf of Tenant
or any Tenant Party (including any Alterations), (iii) the breach of any of
Tenant's obligations under this Lease, (iv) any Hazardous Materials having been
brought into the Building by any Tenant Party, or (v) the enforcement, by any
Governmental Authority or as a consequence of private action, of the Americans
With Disabilities Act, 42 U.S.C. Section 12101 (et seq.) or New York City Local
Law 58 of 1987. Tenant shall not do or permit to be done any act or thing upon
the Premises which will invalidate or be in conflict with Landlord's insurance
policies, and shall not do or permit anything to be done in or upon the
Premises, or use the Premises in a manner, or bring or keep anything therein,
which shall increase the rates for casualty or liability insurance applicable to
the Building. If, as a result of any act or omission by Tenant or by reason of
Tenant's failure to comply with the provisions of this Article, the insurance
rates for the Building shall be increased, then Tenant shall desist from doing
or permitting to be done any such act or thing and shall reimburse Landlord, as
Additional Rent hereunder, for that part of all insurance premiums thereafter
paid by Landlord which shall have been charged because of such act, omission or
failure by Tenant, and shall make such reimbursement upon demand by Landlord.

     SECTION 7.2 Tenant, at its expense, shall comply with all Environmental
Laws and with any directive of any Governmental Authority which shall impose any
violation, order or duty upon Landlord or Tenant under any Environmental Laws
with respect to the Premises or the use or occupation thereof. Tenant's
obligations hereunder with respect to Hazardous Materials shall extend only to
those matters directly or indirectly based on, or arising or resulting from (a)
the actual or alleged presence of Hazardous Materials on the Premises or in the
Building which is caused or permitted by Tenant, and (b) any Environmental Claim
(defined below) relating in any way to Tenant's operation or use of the Premises
or the Building.

     SECTION 7.3 Tenant shall provide Landlord with copies of all communications
and related materials regarding the Premises which Tenant shall receive from or
send to (a) any Governmental Authority relating in any way to any Environmental
Laws, or (b) any Person with respect to any claim based upon any Environmental
Laws or relating in any way to Hazardous Materials (any such claim, an
"Environmental Claim"). Landlord or its agents may perform an

                                      -17-
<PAGE>   18

environmental inspection of the Premises at any time during the Term, upon prior
notice to Tenant except in an emergency.

     SECTION 7.4 Landlord, at its expense, shall comply with all Legal
Requirements with respect to the Building in the event that the failure to so
comply prevents Tenant's use of the Premises for the Permitted Use.

     ARTICLE 8. SUBORDINATION AND NON-DISTURBANCE; ESTOPPEL CERTIFICATES

     SECTION 8.1 Subject to the provisions of Section 8.5, this Lease, and all
rights of Tenant hereunder, are and shall be subject and subordinate in all
respects to all Mortgages and Superior Leases. This Section 8.1 shall be
self-operative and no further instrument of subordination shall be required. In
confirmation of such subordination, Tenant shall promptly execute and deliver
any instrument that Landlord or any Lessor or Mortgagee may reasonably request
to evidence such subordination.

     SECTION 8.2 In the event of any act or omission of Landlord which would
give Tenant the right, immediately or after lapse of a period of time, to cancel
or terminate this lease, or to claim a partial or total eviction, Tenant shall
not exercise such right (a) until it has given written notice of such act or
omission to each Mortgagee and Lessor whose name and address shall previously
have been furnished to Tenant in writing, and (b) unless such act or omission
shall be one which is not capable of being remedied by Landlord or such
Mortgagee or Lessor within a reasonable period of time, until a reasonable
period for remedying such act or omission shall have elapsed following the
giving of such notice and following the time when such Mortgagee or Lessor shall
have become entitled under such Mortgage or Superior Lease, as the case may be,
to remedy the same (which reasonable period shall in no event be less than the
period to which Landlord would be entitled under this Lease or otherwise, after
similar notice, to effect such remedy), provided such Mortgagee or Lessor shall
with due diligence give Tenant written notice of its intention to remedy such
act or omission, and such Mortgagee or Lessor shall commence and thereafter
continue with reasonable diligence to remedy such act or omission. If more than
one Mortgagee or Superior Lessor shall become entitled to any additional cure
period under this Section 8.2, such cure periods shall run concurrently, not
consecutively.

     SECTION 8.3 Subject to the provisions of Section 8.5, if a Mortgagee or
Lessor shall succeed to the rights of Landlord under this Lease, whether through
possession or foreclosure action or delivery of a new lease or deed, then at the
request of such party so succeeding to Landlord's rights ("Successor Landlord")
and upon Successor Landlord's written agreement to accept Tenant's attornment,
Tenant shall attorn to and recognize Successor Landlord as Tenant's landlord
under this Lease, and shall promptly execute and deliver any instrument that
Successor Landlord may reasonably request to evidence such attornment. Upon such
attornment this Lease shall continue in full force and effect as, or as if it
were, a direct lease between Successor Landlord and Tenant upon all of the
terms, conditions and covenants as are set forth in this Lease and shall be
applicable after such attornment except that Successor Landlord shall not:

     (a)  be liable for any previous act or omission of Landlord under this
Lease;

                                      -18-
<PAGE>   19

     (b)  be subject to any offset, not expressly provided for in this Lease,
which shall have theretofore accrued to Tenant against Landlord; or

     (c)  be bound by any previous modification of this Lease, not expressly
provided for in this Lease, or by any previous prepayment of more than one
month's fixed rent, unless such modification or prepayment shall have been
expressly approved in writing by such Mortgagee or Lessor.

     SECTION 8.4 Each party agrees, at any time and from time to time, as
requested by the other party, upon not less than ten (10) days' prior notice, to
execute and deliver to the other a written statement executed and acknowledged
by such party (a) stating that this Lease is then in full force and effect and
has not been modified (or if modified, setting forth all modifications), (b)
setting forth the then annual Fixed Rent, (c) setting forth the date to which
the Fixed Rent and Additional Rent have been paid, (d) stating whether or not,
to the best knowledge of the signatory, the other party is in default under this
Lease, and if so, setting forth the specific nature of all such defaults, (e)
stating the amount of the Security Deposit, (f) stating whether there are any
subleases affecting the Premises, (g) stating the address of the signatory to
which all notices and communication under the Lease shall be sent, the
Commencement Date and the Expiration Date, and (i) as to any other matters
reasonably requested by the party requesting such certificate. The parties
acknowledge that any statement delivered pursuant to this Section 8.4 may be
relied upon by others with whom the party requesting such certificate may be
dealing, including any purchaser or owner of the Real Property or the Building,
or of Landlord's interest in the Real Property or the Building or any Superior
Lease, or by any Mortgagee or Lessor, or by any prospective or actual sublessee
of the Premises or assignee of this Lease, or permitted transferee of or
successor to Tenant.

     SECTION 8.5 Notwithstanding the foregoing provisions of this Article 8,
Landlord agrees to (a) obtain from the Mortgagee under the existing Mortgage,
and (b) to use commercially reasonable efforts (which shall not include the
payment of any sums or the prosecution of any legal actions) to obtain from each
of the Mortgagees or Lessors under any Mortgages or Superior Leases entered into
after the date hereof, a Non-Disturbance Agreement; provided, however, that if
Landlord shall be unsuccessful in so obtaining any such Non-Disturbance
Agreement from any Mortgagee or Lessor under any Mortgage or Superior Lease
entered into after the date hereof, then Landlord shall have no liability to
Tenant therefor, and this Lease shall remain in full force and effect. Tenant
shall reimburse Landlord, within ten (10) days after demand therefor, for
Landlord's actual out-of-pocket costs and expenses, including reasonable
attorney's fees and disbursements, incurred in connection with such efforts. A
"Non-Disturbance Agreement" shall mean a subordination, attornment and
non-disturbance agreement duly executed and acknowledged by the holder of a
Mortgage or a Superior Lease, as the case may be, and by Tenant, and in
recordable form, and (i) with respect to the existing Mortgage, in the form
attached to this Lease as Exhibit E, and (ii) with respect to any Mortgages or
Superior Leases entered into after the date hereof, in the form customarily
employed by such Mortgagee or Lessor. Landlord represents to Tenant that (i)
LaSalle National Bank, as Trustee for GS Mortgage Securities Corporation II
Commercial Mortgage Pass-Through Certificates, Series 1998-GSFL1 ("Lender") is
the sole Mortgagee of the Building and the Real Property, and (ii) there are no
Superior Leases affecting the Building or the Real Property. If Landlord fails
to deliver to Tenant a Non-Disturbance Agreement executed by Lender within sixty
(60) days

                                      -19-
<PAGE>   20

following the execution and delivery of this Lease, then Tenant shall have the
right to terminate this Lease by notice to Landlord, such termination to be
effective on the date which shall be thirty (30) days after the date such notice
is given, upon which date this Lease shall come to an end and terminate, and
neither party shall have any liability to the other hereunder, and Landlord
shall return the Security Deposit to Tenant, together with all prepaid Fixed
Rent and Additional Rent, if any, deposited by Tenant hereunder. Notwithstanding
anything to the contrary contained herein, if Landlord shall deliver such
Non-Disturbance Agreement executed by Lender, to Tenant at any time within
thirty (30) days following Landlord's receipt of such notice by Tenant, such
termination shall be void and of no force and effect, and Tenant shall have no
further right to terminate this Lease pursuant to this Section 8.5.

     ARTICLE 9. SERVICES

     SECTION 9.1 Landlord shall provide, at Landlord's expense, except as
otherwise set forth herein, the following services:

     SECTION 9.2 ELECTRICITY. (a) Landlord, subject to the provisions of this
Article 9, shall make available to Tenant, at a location in the basement of the
Building to be designated by Landlord, AC electric capacity at a level not less
than 2800 amperes, 480 volt, 3-phase, 4-wire, dedicated to Tenant. Tenant shall
be solely responsible, at Tenant's sole cost and expense, for the installation
of all risers and other electrical facilities and equipment required in order to
deliver such electric power to the Premises and to distribute it therein. Tenant
shall pay to Landlord for making such electric power available to Tenant a
one-time fee of $838,600.00 on the date on which Landlord makes such additional
electric power available to Tenant. Tenant covenants that Tenant's use and
consumption of electric current shall not at any time exceed the electrical
capacity supplied to the Premises from time to time pursuant to this Section
9.2, nor exceed the capacity of any of the electrical facilities and
installations in or otherwise serving or being used in the Premises. Tenant
shall pay Landlord, as Additional Rent, at any time and from time to time, but
no more frequently than monthly, for its consumption of electric power at the
Premises, as provided herein.

     (b)  In the event that Tenant's total power requirements at the Premises,
based on an annual review of Tenant's consumption following the first (1st)
anniversary of the Commencement Date, shall be less than the 2800 ampere, 480
volt service described above, Tenant shall pay to Landlord an annual sum equal
to the fee, if any, which Landlord is obligated to pay to the Electricity
Provider (as hereinafter defined), commonly known as a "use it or lose it" fee,
for the availability of such capacity, presently payable by Landlord to the
Electricity Provider at the rate of $12.50 per unused ampere per annum. Further,
if as of the third (3rd) anniversary of the Commencement Date, Tenant shall
continue to require less than the 2800 ampere, 480 volt service described above,
then Landlord shall have the right to reduce the level of electric power
supplied to the Premises to not less than one hundred twenty-five percent (125%)
of Tenant's actual power requirements as measured at the peak demand level
occurring during the immediately preceding calendar quarter.

     (c)  The calculations and determinations of the charges for electric power
consumed by Tenant shall be based on the readings of one or more submeters to be
installed by Landlord at Tenant's sole expense, applied to Landlord's
Electricity Cost, as defined in Section

                                      -20-
<PAGE>   21

9.2(d). Tenant shall pay for electricity consumed as determined thereunder as
measured and calculated from time to time by such submeter or submeters, plus
Landlord's charge for overhead and supervision, which charge shall not exceed
five percent (5%) of such payment by Tenant. In addition, Tenant shall pay to
Landlord, as Additional Rent (i) the fees and expenses of Landlord's electrical
contractor for services rendered by such contractor in the maintenance and
repair of such submeter(s), and (ii) the amount of any taxes imposed by any
Governmental Authority on Landlord's receipts from the sale of electricity to
Tenant. In the event that more that one submeter is used to measure Tenant's
consumption of electricity in the Premises, Tenant shall be billed only on the
basis of the "totalized" demand, i.e., as though a single meter were measuring
such usage.

     (d)  "Landlord's Electricity Cost" means the cost per kilowatt hour and
cost per kilowatt demand, adjusted by time of day factors, fuel adjustment
charges and other applicable rate adjustments, to Landlord for the purchase of
electricity from the public utility or other electricity provider furnishing
electricity service to the Building from time to time (the "Electricity
Provider"), including sales and other taxes imposed by any Governmental
Authority on Landlord's purchase of electricity. If at any time during the Term
the cost elements comprising Landlord's Electricity Cost shall be increased by
the Electricity Provider, or Landlord's Electricity Cost shall be increased for
any other reason, then effective as of the date of such increase, Tenant's
payment for submetered electricity under this Section 9.2 shall be
proportionately increased. Landlord reserves the right to contract with
different Electricity Providers from time to time in its sole judgment, and
without reference to whether any Electricity Provider selected by Landlord
provides lower rates than any other electricity supplier. Currently, Landlord's
Electricity Cost is based upon Consolidated Edison Company's Service
Classification rate schedule S.C. #4 Rate II as in effect on the Commencement
Date.

     (e)  During the period beginning on the Commencement Date and ending on the
date upon which the submeters to be installed by Landlord in the Premises become
operational, Tenant shall pay to Landlord a fixed fee for electric energy
supplied to the Premises of (i) during the period prior to the date upon which
Tenant first occupies all or any portion of the Premises for the conduct of its
business, an amount per annum equal to One and 00/100 Dollar ($1.00) multiplied
by the number of Rentable Square Feet in the Premises, in equal monthly
installments on the first (1st) day of each month during such period, and (ii)
from and after the date upon which Tenant first occupies all or any portion of
the Premises for the conduct of its business, an amount per annum equal to Four
and 00/100 Dollars ($4.00) multiplied by the number of Rentable Square Feet in
the Premises, in equal monthly installments on the first (1st) day of each month
during such sentence, through the date upon which such submeters become
operational.

     (f)  Tenant covenants that Tenant's use and consumption of electric current
shall not at any time exceed the capacity of any of the electrical facilities
and installations in or otherwise serving or being used in the Premises and
Tenant shall, upon the submission by Landlord to Tenant of written notice,
promptly cease the use of any of Tenant's electrical equipment which Landlord
believes will cause Tenant to exceed such capacity. Any additional feeders,
risers, electrical facilities and other such installations required for electric
service to the Premises will be supplied by Landlord, at Tenant's expense, upon
Landlord's prior consent in each instance, provided that, in Landlord's
judgment, such additional electrical facilities and

                                      -21-
<PAGE>   22

installations, feeders or risers are necessary and are permissible under Legal
Requirements (including the New York State Energy Conservation Construction
Code) and insurance regulations and the installation of such feeders or risers
will not cause permanent damage or injury to the Building or the Premises or
cause or create a dangerous or hazardous condition or entail excessive or
unreasonable alterations or repairs or interfere with, or disturb, other tenants
or occupants of the Building. In addition, Landlord shall have no obligation to
consent to such additional feeders, risers, electrical facilities and
installations if in Landlord's judgment, the same would give Tenant a
disproportionate amount of the electrical current supplied to the Building at
the expense of, or in derogation of the needs of other tenants or occupants of
the Building.

     (g)  Landlord shall not in any way be liable or responsible to Tenant for
any loss, damage or expense which Tenant may sustain or incur as a result of the
unavailability of or interruption in the supply of electric current to the
Premises or a change in the quantity or character or nature of such current and
such change, interruption or unavailability shall not constitute an actual or
constructive eviction, in whole or in part, or entitle Tenant to any abatement
or diminution of rent (except that Tenant's liability to pay Landlord for
electricity under this Section 9.2 shall cease as of the date of such
disturbance), or relieve Tenant from any of its obligations under this Lease, or
impose any liability upon Landlord, or its agents, by reason of inconvenience or
annoyance to Tenant, or injury to or interruption of Tenant's business, or
otherwise.

     (h)  Landlord reserves the right to discontinue furnishing electricity to
Tenant in the Premises on not less than one hundred twenty (120) days' notice to
Tenant. If Landlord exercises such right to discontinue, or is compelled to
discontinue furnishing electricity to Tenant, this Lease shall continue in full
force and effect and shall be unaffected thereby, except only that from and
after the effective date of such discontinuance, Landlord shall not be obligated
to furnish electricity to Tenant, and Tenant shall have no further obligation to
pay Landlord for electricity supplied to the Premises. If Landlord so
discontinues furnishing electricity to Tenant, Tenant shall arrange to obtain
electricity directly from the Electricity Provider. Such electricity may be
furnished to Tenant by means of the then existing electrical facilities serving
the Premises to the extent that the same are available, suitable and safe for
such purposes. All equipment which may be required for Tenant to obtain
electricity shall be installed by Landlord at the sole cost and expense of (i)
Landlord, if Landlord voluntarily discontinues such service, (ii) Landlord and
Tenant equally, if Landlord is compelled to discontinue such service by the
Electricity Provider or pursuant to applicable Legal Requirements, or (iii)
Tenant, if such discontinuance arises out of the acts or omissions of Tenant.
Landlord will not voluntarily discontinue furnishing electricity to Tenant until
Tenant is able to receive electricity directly from the Electricity Provider.

     (i)  If submetering of electricity in the Building is hereafter prohibited
by any Legal Requirement, or by any order or ruling of the Public Service
Commission of the State of New York, then Tenant shall apply, within ten (10)
days of Tenant's receiving notice thereof, to the Electricity Provider in order
to obtain direct electric service, and Tenant shall bear all costs and expenses,
as set forth in Section 9.2(g), necessary to comply with all rules and
regulations of the Electricity Provider pertinent thereto, and from and after
the date upon which Tenant procures direct electric service, Landlord shall be
relieved of any further obligation to furnish electricity to Tenant pursuant to
this Section 9.2. Such electricity may be furnished to Tenant by

                                      -22-
<PAGE>   23

means of the then existing electrical facilities serving the Premises, including
Building feeders and risers, to the extent that the same are suitable and safe
for such purposes.

     SECTION 9.3 HEAT. (a) Landlord shall provide heat to the Premises on
Business Days from 8:00 A.M. to 6:00 P.M., when required in Landlord's judgment
for the comfortable use and occupancy of the Premises, through use of the
Building standard heating system (the "Building Heating System).

     (b)  Anything in this Section 9.3 to the contrary notwithstanding, Landlord
shall not be responsible if the normal operation of the Building Heating System
shall fail to provide heat at reasonable temperatures. Tenant at all times shall
cooperate fully with Landlord and shall abide by the regulations and
requirements which Landlord may prescribe for the proper functioning and
protection of the Building Heating System.

     (c)  Landlord shall not be required to furnish heat during periods other
than the hours and days set forth in this Section 9.3 for the furnishing and
distributing of such services ("Overtime Periods"), unless Landlord has received
advance notice from Tenant requesting such service not less than twenty-four
(24) hours prior to the time when such service shall be required. Accordingly,
if Landlord shall furnish heat to the Premises at the request of Tenant during
Overtime Periods, Tenant shall pay Landlord, as Additional Rent within ten (10)
days after demand, for such services at the standard rate then fixed by Landlord
for the Building, which rate as of the date of this Lease is $250.00 per hour,
subject to increase during the Term due to increases in Landlord's costs.
Failure by Landlord to furnish or distribute heat or any other services during
Overtime Periods shall not constitute an actual or constructive eviction, in
whole or in part, or entitle Tenant to any abatement or diminution of Fixed Rent
or Additional Rent, or relieve Tenant from any of its obligations under this
Lease, or impose any liability upon Landlord or its agents by reason of
inconvenience or annoyance to Tenant, or injury to or interruption of Tenant's
business or otherwise.

     (d)  Landlord shall have no obligation to provide air-conditioning or
ventilation services to the Premises. Landlord agrees that Tenant shall have the
right, subject to the provisions of Article 3, to install a self-contained
package HVAC unit, at Tenant's sole cost and expense, as part of the Initial
Alterations ("Tenant's HVAC System") at a location on the roof of the Building
("Roof") as provided in Section 9.9 below or in a location otherwise designated
by Landlord. Tenant shall repair and maintain Tenant's HVAC System in good
working order at Tenant's sole cost and expense. Upon the expiration or sooner
termination of the Term of this Lease, at Landlord's request, Tenant shall
remove Tenant's HVAC System and restore any damage to the Building and the
Premises resulting from such removal.

     SECTION 9.4 ELEVATORS. (a) Landlord shall provide passenger elevator
service to the Premises on Business Days from 8:00 A.M. to 6:00 P.M. and freight
elevator facilities on a non-exclusive basis, on Business Days from 8:00 A.M. to
4:45 P.M. ("Freight Business Hours"), and shall have one passenger elevator
available at all other times. Tenant shall have access to the Building and the
Premises twenty-four (24) hours a day, seven (7) days per week. Such elevator
service shall be subject to such rules and regulations as Landlord may
promulgate from time to time with respect thereto. Landlord shall have the right
to change the operation or manner of operation of any of the elevators in the
Building and/or to discontinue, temporarily or

                                      -23-
<PAGE>   24

permanently, the use of any one or more cars in any of the passenger, freight or
truck elevator banks. Tenant shall have the non-exclusive right to use the
Building's loading platform in common with Landlord and the other tenants of the
Building during regular business hours, in accordance with rules and regulations
therefore promulgated by Landlord, and on a "first come first served" basis.

     (b)  Tenant shall not use the freight elevator during Freight Business
Hours for the delivery of construction materials or for moving into or out of
the Premises. Landlord will make the freight elevator available to Tenant during
other than Freight Business Hours, upon not less than 48 hours prior request by
Tenant, and Tenant shall pay as Additional Rent the charge therefor established
by Landlord from time to time, payable within ten (10) days of rendition of a
bill therefor. As of the date hereof, Landlord' s current charge for freight
elevator service during other than Freight Business Hours is $99.00/hour, which
charge is subject to increase to reflect increases in Landlord's costs of
providing such service (including the charges for a hoisting engineer).

     SECTION 9.5 CLEANING. Tenant shall, at Tenant's sole cost, provide cleaning
services at the Premises pursuant to reasonable rules and regulations
established by Landlord from time to time, and use a cleaning contractor
approved by Landlord. Tenant shall cause all refuse and rubbish removed from the
Premises by Tenant's contractor to be brought to an area of the Building
designated from time to time by Landlord, and Landlord shall cause such refuse
and rubbish to be removed from such designated area. Tenant shall reimburse
Landlord, as Additional Rent, within twenty (20) days of delivery of Landlord's
statement therefor, for Landlord's out-of-pocket costs in removing Tenant's
refuse and rubbish from the Building.

     SECTION 9.6 WATER. Landlord shall furnish hot and cold water in such
quantities as Landlord deems sufficient for ordinary drinking, lavatory and
cleaning purposes to the Premises. If Tenant requires, uses or consumes water
for any purpose in addition to ordinary lavatory, cleaning and drinking
purposes, Landlord may install a hot water meter and a cold water meter and
thereby measure Tenant's consumption of water for all purposes. Tenant shall (a)
pay to Landlord the cost of any such meters and their installation, (b) at
Tenant's sole cost and expense, keep any such meters and any such installation
equipment in good working order and repair, and (c) pay to Landlord, as
Additional Rent, as and when billed therefor for water consumed, together with a
charge for any required pumping or heating thereof, all sewer rents, charges or
any other taxes, rents, levies or charges which now or hereafter are assessed,
imposed or shall become a lien upon the Premises or the Real Property pursuant
to law, order or regulation made or issued in connection with any such metered
use, consumption, maintenance or supply of water, water system, or sewage or
sewage connection or system, and in default in making such payment Landlord may
pay such charges and collect the same from Tenant.

     SECTION 9.7 RUBBISH AND REMOVAL. Tenant shall, at Tenant's sole cost,
provide refuse and rubbish removal service at the Premises at times, and
pursuant to regulations, established by Landlord from time to time.

     SECTION 9.8 NO WARRANTY OF LANDLORD. Landlord does not warrant that any of
the services to be provided by Landlord to Tenant hereunder, or any other
services which Landlord may supply (a) will be adequate for Tenant's particular
purposes or as to any other

                                      -24-
<PAGE>   25

particular need of Tenant or (b) will be free from interruption, and Tenant
acknowledges that any one or more such services may be interrupted or suspended
by reason of Unavoidable Delays. In addition, Landlord reserves the right to
stop, interrupt or reduce service of the Building Systems by reason of
Unavoidable Delays, or for repairs, additions, alterations, replacements,
decorations or improvements which are, in the judgment of Landlord, necessary to
be made, until said repairs, alterations, replacements or improvements shall
have been completed. Any such interruption or discontinuance of service, or the
exercise of such right by Landlord to suspend or interrupt such service shall
not (i) constitute an actual or constructive eviction, or disturbance of
Tenant's use and possession of the Premises, in whole or in part, (ii) entitle
Tenant to any compensation or to any abatement or diminution of Fixed Rent or
Additional Rent, except as provided in Section 5.4, (iii) relieve Tenant from
any of its obligations under this Lease, or (iv) impose any responsibility or
liability upon Landlord or its agents by reason of inconvenience or annoyance to
Tenant, or injury to or interruption of Tenant's business, or otherwise.
Landlord shall use reasonable efforts to minimize interference with Tenant's
access to and use and occupancy of the Premises in making any repairs,
alterations, additions, replacements, decorations or improvements; provided,
however, that Landlord shall have no obligation to employ contractors or labor
at "overtime" or other premium pay rates or to incur any other "overtime" costs
or additional expenses whatsoever. Landlord shall not be required to furnish any
services except as expressly provided in this Article 9.

     SECTION 9.9 ROOF EQUIPMENT.

     (a)  Landlord hereby grants to Tenant, for Tenant's own use and not for
resale purposes, a non-exclusive license of sufficient space on the roof of the
Building, at a location designated by Landlord in its sole discretion (the "Roof
Space") for the installation by Tenant of (i) the Antenna Equipment (as defined
in Section 9.10), (ii) Tenant's HVAC System (together with any dry coolant
condensers, chillers and related HVAC equipment), and (iii) Tenant's Generators
(as defined in Section 9.11) (together with related cabling, pumps, mountings
and supports for all of the foregoing, collectively, the "Roof Equipment"), at a
location or locations designated by Landlord. In connection therewith, and
subject to the rights of any tenant leasing space in the Building as of the date
of this Lease, Landlord shall make available to Tenant reasonable access to the
roof for the construction, installation, upgrade, maintenance, repair, operation
and use of the Roof Equipment. If any of the Roof Equipment generates noise
which is likely, in Landlord's reasonable judgment, to disturb other tenants or
occupants of the Building or the surrounding buildings, then Tenant shall
install sound attenuated acoustic enclosures reasonably satisfactory to Landlord
designed to eliminate such noise or reduce such noise to acceptable levels. If
Tenant requires riser space for conduit connecting the Premises to the Roof
Equipment, Landlord shall make available to Tenant, for Tenant's use solely in
connection with the Roof Equipment, at a location or locations determined by
Landlord in its sole judgment, riser space sufficient for the installation of
telecommunications lines, cabling and supply and return lines reasonably
required for the operation of the Roof Equipment. Tenant shall pay Landlord's
annual charge for such conduit as provided in Section 9.12, and all work in
connection with the installation of such conduit shall be performed as provided
in Section 9.12. References herein to the Roof Equipment shall be deemed to
include such riser and any conduit therein.

     (b)  The installation of the Roof Equipment shall be performed by Tenant at
Tenant's sole cost and expense (including any actual costs and expenses in
connection with

                                      -25-
<PAGE>   26

reinforcing the roof of the Building, if required, subject to Section 9.12) in
accordance with and subject to the provisions of Article 3. Tenant shall pay a
license fee to Landlord for the Roof Space, as Additional Rent in advance on the
first day of each month during the Term, as follows (i) during the period from
the Rent Commencement Date through the day before the fifth (5th) anniversary of
the Rent Commencement Date, one-twelfth (1/12) of the product of the usable
square foot area of the Roof Space, multiplied by Fifteen and 00/100 Dollars
($15.00) per annum, (ii) during the period from the fifth (5th) anniversary of
the Rent Commencement Date through the day before the tenth (10th) anniversary
of the Rent Commencement Date, one-twelfth (1/12) of the product of the usable
square foot area of the Roof Space, multiplied by Eighteen and 00/100 Dollars
($18.00) per annum, and (iii) during the period from the tenth (10th)
anniversary of the Rent Commencement Date through the Expiration Date,
one-twelfth (1/12) of the product of the usable square foot area of the Roof
Space, multiplied by Twenty-One and 00/100 Dollars ($21.00) per annum. All of
the provisions of this Lease shall apply to the installation, use and
maintenance of the Roof Equipment, including all provisions relating to
compliance with Legal Requirements, insurance, indemnity, repairs and
maintenance. The license granted to Tenant in this Section 9.9 shall not be
assignable by Tenant separately from this Lease.

     (c)  Landlord retains the right to use the portion of the roof on which the
Roof Equipment is located for any purpose whatsoever, provided such use shall
not materially interfere with the functioning of the Roof Equipment. Tenant
shall have reasonable access to the Roof Equipment at all times, and Landlord
shall not interfere with, the use of the Roof Equipment so as to cause the
operation thereof to be materially interrupted or impaired. Tenant shall use the
Roof Equipment so as not to cause any material interference to Landlord's use of
the roof, including the use by Landlord or other tenants or occupants of the
Building of other equipment thereon (including data transmission or other
similar or dissimilar equipment), or materially damage to or interference with
the operation of the Building or the Building Systems. If any of Tenant's Roof
Equipment materially interferes with any equipment installed by Landlord or any
tenant leasing space in the Building as of the date of this Lease, or materially
interferes with the operation of the Building or the Building Systems, then
Tenant, at its sole cost and expense, shall take all steps necessary to
eliminate such interference, and if Tenant shall fail to eliminate such
interference, Tenant shall relocate the Roof Equipment to another area on the
roof designated by Landlord. In the event Tenant fails, within thirty (30) days
after notice, to relocate or remove the Roof Equipment, Landlord may do so, and
Tenant shall promptly reimburse Landlord for any costs and expenses incurred by
Landlord in connection therewith. If following any relocation, such interference
continues to occur, then Tenant, at its sole cost and expense, shall
immediately, upon notice from Landlord discontinue its use of the Roof Equipment
and remove the Roof Equipment from the Roof. In the event Tenant fails, within
five (5) days' after notice from Landlord, to relocate or remove the Roof
Equipment or otherwise fails to comply with any of the conditions set forth in
this Section 9.9 or if Landlord shall determine, in its reasonable judgment,
that the Roof Equipment (i) may cause a health hazard or danger to property,
(ii) may violate or otherwise fail to comply with any governmental or
quasi-governmental standards for non-ionizing radiation for occupational and/or
general public levels, without limiting the rights and remedies landlord may
otherwise have under this Lease, Landlord may relocate or remove the Roof
Equipment, and Tenant shall promptly reimburse Landlord for any costs incurred
by Landlord in connection therewith.

                                      -26-
<PAGE>   27

     (d)  Landlord may at its option, at any time during the Term upon not less
than sixty (60) days prior notice to Tenant (except in the event of an
emergency) relocate the Roof Equipment to another area on the roof designated by
Landlord, provided that such relocation of the Roof Equipment does not cause the
operation thereof to be interrupted or impaired, other than temporarily, and
except as set forth in Section 9.9(c), such relocation is performed at
Landlord's sole cost and expense. Landlord shall use reasonable efforts to
minimize the duration of such interruption, provided that Landlord shall have no
obligation to employ contractors or labor at overtime or other premium pay rates
or to incur any other overtime costs or additional expenses whatsoever, unless
Tenant shall first pay to Landlord Landlord's reasonable estimate of all
incremental cost increases to do so. In such event Tenant shall pay, as
Additional Rent upon presentation of appropriate invoices, all additional costs
incurred by Landlord in connection therewith.

     (e)  Landlord shall not have any obligations with respect to the Roof
Equipment or compliance with any Legal Requirements (including the obtaining of
any required permits or licenses, or the maintenance thereof) relating thereto,
nor shall Landlord be responsible for any damage that may be caused to Tenant or
the Roof Equipment by any other tenant or occupant of the Building.

     (f)  Tenant shall (i) be solely responsible for any damage caused as a
result of the use of the Roof Equipment, (ii) promptly pay any tax, license,
permit or other fees or charges imposed pursuant to any Legal Requirements
relating to the installation, maintenance or use of the Roof Equipment, (iii)
promptly comply with all precautions and safeguards recommended by Landlord's
insurance company and all Governmental Authorities, and (iv) promptly and
diligently perform all necessary repairs or replacements to, or maintenance of,
the Roof Equipment, provided, however, that if Tenant's failure after thirty
(30) days' notice from Landlord to so repair, replace or maintain the Roof
Equipment materially jeopardizes in any way Landlord's or any other tenant's
property located on the roof or within the Building, Landlord may, at Landlord's
option, elect to perform such repairs, replacements or maintenance at Tenant's
sole cost and expense. Landlord shall give Tenant thirty (30) days' prior notice
of its election to perform such repairs, except in an emergency.

     (g)  The privileges granted Tenant under this Section 9.9 merely constitute
a license and shall not, now or at any time after the installation of the Roof
Equipment, be deemed to grant Tenant a leasehold or other real property interest
in the Building or any portion thereof, including the Building's roof. The
license granted to Tenant in this Section 9.9 shall continue until and
automatically terminate and expire upon the expiration or earlier termination of
this Lease and the termination of such license shall be self-operative and no
further instrument shall be required to effect such termination. For so long as
this Lease shall be in full force and effect, Landlord will not terminate the
license granted to Tenant hereby. Notwithstanding the foregoing, upon request by
Landlord, Tenant, at Tenant's sole cost and expense, shall promptly execute and
deliver to Landlord, in recordable form, any certificate or other document
reasonably required by Landlord confirming the termination of Tenant's right to
use the roof of the Building.

     (h)  The Roof Equipment shall be treated for all purposes of this Lease as
Tenant's Alterations. If requested by Landlord, Tenant shall cause Roof
Equipment and all equipment and installations appurtenant thereto to be
designated as one or more separate tax lots

                                      -27-
<PAGE>   28

by the City of New York for all purposes of assessment and payment of Taxes, and
Tenant shall pay all Taxes imposed thereon directly to the taxing authorities,
without deduction or offset against Rent under this Lease. If for any reason
Tenant fails (with or without Landlord's consent thereto) to so cause Roof
Equipment to be designated as one or more separate tax lots, Tenant shall pay to
Landlord monthly, as Additional Rent upon demand, the amount, determined by
Landlord in its reasonable discretion, by which Taxes imposed upon the Building
have been increased on account of Tenant's installation of the Roof Equipment.

     SECTION 9.10 ANTENNA EQUIPMENT.

     (a)  Subject to the provisions of Section 9.9, Landlord hereby grants to
Tenant, for use by Tenant and Tenant's colocation customers and not for resale
purposes, a non-exclusive license of five hundred (500) square feet of space on
the roof of the Building, at a location designated by Landlord in its sole
discretion, for the construction, installation, operation and use by Tenant of
antennas, not to exceed ten feet (10') in height, for use in conjunction with
Tenant's equipment and facilities in the Premises together with related cabling,
mountings and supports for the foregoing (collectively, the "Antenna
Equipment"), at a location designated by Landlord, taking into account any
reasonable "line of sight" requirements of Tenant.

     (b)  Supplementing the provisions of Section 9.9(c), if the Antenna
Equipment materially interferes with any equipment installed by Landlord or any
tenant leasing space in the building as of the date of this Lease, or materially
interferes with the operation of the Building or the Building Systems, or if
Landlord shall determine that the operation thereof (i) may cause a health
hazard or danger to property, (ii) may not be in accordance with governmental or
quasi-governmental standards for non-ionizing radiation for occupational or
general public health levels, then Tenant, at its sole cost and expense, shall
take all steps necessary to eliminate such interference, and if Tenant shall
fail to eliminate such interference, Tenant shall relocate the Antenna Equipment
to another area on the roof of the Building designated by Landlord, as provided
in Section 9.9(c).

     (c)  Supplementing the provisions of Section 9.9(e), Landlord makes no
representation that the Antenna Equipment will be able to receive or transmit
communication signals without interference or disturbance (whether or not by
reason of the installation or use of similar equipment by others on the roof)
and Tenant agrees that Landlord shall not be liable to Tenant therefor.

     SECTION 9.11 TENANT'S EMERGENCY GENERATORS.

     (a)  Subject to the provisions of Section 9.9, Landlord hereby grants to
Tenant, for Tenant's own use and not for resale purposes, a non-exclusive
license of sufficient space on the roof of the Building, at a location
designated by Landlord in its sole discretion, for the construction,
installation, operation and use by Tenant of two diesel-powered electric
generators, each having a capacity of up to 2000 kW at 480 volts, and other
related equipment, including mountings and supports (collectively, "Tenant's
Generators"). Tenant shall have the right, subject to Article 3, to connect
Tenant's Generators to one of the Building's diesel fuel tanks as designated by
Landlord and Landlord shall make available to Tenant up to four hundred (400)
gallons of diesel fuel to Tenant's Generators from such fuel tank. Tenant shall
reimburse

                                      -28-
<PAGE>   29

Landlord for Landlord's actual cost for such diesel fuel used by Tenant, as
indicated on a meter to be installed by Landlord, at Tenant's expense, at a
point designed by Landlord along the fuel line to be installed by Tenant (at
Tenant's cost and expense) connecting such fuel tank to Tenant's Generators.
Tenant shall pay to Landlord for making such diesel fuel available to Tenant a
one-time fee of $200,000.00 on the date on which Landlord makes such diesel fuel
available to Tenant. Tenant shall be solely responsible, at Tenant's sole cost
and expense, for the installation of all fuel lines, pumps, piping, meters and
other equipment or installations necessary for the operation of Tenant's
Generators as provided in this Section 9.11. Tenant shall pay Landlord, as
Additional Rent, at any time and from time to time, but no more frequently than
monthly, for its consumption of diesel fuel as provided herein. Subject to the
rights of other tenants leasing space in the Building as of the date of this
Lease, Landlord shall make available to Tenant reasonable access to the roof for
the construction, installation, maintenance, repair, operation and use of
Tenant's Generators. Tenant shall be responsible for all reinforcement and
bracing necessary to enable the roof of the Building to support Tenant's
Generators; provided, however, that Landlord shall have the right, by notice to
Tenant within ten (10) days of delivery to Landlord of Tenant's plans and
specifications for Tenant's Generators, to require Tenant to install Tenant's
Generators in a vertically contiguous arrangement (i.e., one generator on top of
the other), and if Landlord shall require Tenant's Generators to be installed in
such vertically contiguous arrangement, then Landlord shall reimburse Tenant for
fifty percent (50%) of any costs and expenses reasonably incurred by Tenant to
reinforce or brace the roof of the Building, if necessary, to allow Tenant's
Generators to be installed in such vertically contiguous arrangement. If Tenant
requires riser space for electrical conduits connecting Tenant's Generators to
the Premises, or for fuel lines connecting Tenant's Generators to the Building
fuel tank designated by Landlord, then, subject to availability of riser space
in the Building, Landlord shall make such riser space available to Tenant, and
Tenant shall pay for such riser space, all as provided in Section 9.12.
References herein to Tenant's Generators shall be deemed to include such riser
and the electrical conduits and fuel lines appurtenant thereto.

     (b)  Tenant's Generators shall be treated for all purposes of this Lease as
Tenant's Alterations. Landlord shall have no right to require Tenant and Tenant
shall have no right to remove Tenant's Generators on the Expiration Date or
sooner termination of this Lease. If requested by Landlord, Tenant shall cause
Tenant's Generators and all equipment and installations appurtenant thereto to
be designated as a separate tax lot by the City of New York for all purposes of
assessment and payment of Taxes, and Tenant shall pay all Taxes imposed thereon
directly to the taxing authorities, without deduction or offset against Rent
under this Lease. If for any reason Tenant fails (with or without Landlord's
consent thereto) to so cause Tenant's Generators to be designated as a separate
tax lot, Tenant shall pay to Landlord monthly, as Additional Rent upon demand,
the amount, determined by Landlord in its reasonable discretion, by which Taxes
imposed upon the Building have been increased on account of Tenant's
installation of Tenant's Generators.

     (c)  Landlord acknowledges that Tenant requires the temporary use of a
portable emergency generator (the "Temporary Generator") until such time as
Tenant's Generators are installed. Provided that Tenant shall obtain all
necessary permits and approvals from all requisite Governmental Authorities,
Landlord shall permit Tenant to place the Temporary Generator, at a location
determined by Landlord in its sole judgment, on a street or sidewalk adjacent to
the Building. If Tenant is unable to obtain the necessary permits and

                                      -29-
<PAGE>   30

approvals required to enable Tenant to place the Temporary Generator outside of
and adjacent to the Building or if Landlord, in its sole discretion, prohibits
Tenant from placing the Temporary Generator outside of the Building, Landlord
will make space available to Tenant for the installation of the Temporary
Generator, at a location determined by Landlord in its sole judgment, in the
truck loading area of the Building. Tenant, if necessary and only in connection
with Tenant's installation and use of the Temporary Generator, shall have the
right to install (i) an emergency generator plug on the outside of the Building
adjacent to the loading dock area, through a pathway to be designated by
Landlord, for the purpose of connecting the Premises to the Temporary Generator,
and (ii) an electrical grounding system as required for the Temporary Generator,
subject to Landlord's review and approval of plans, which approval shall not be
unreasonably withheld or delayed. Upon the earlier to occur of (i) the
installation of Tenant's Generators, and (ii) the date which is six (6) months
from the Commencement Date, Tenant shall cease using and at its sole cost and
expense remove the Temporary Generator and all related equipment from the
Building, and shall restore any damage to the Building resulting therefrom.
Tenant's installation of the Temporary Generator shall constitute an Alteration
and shall be performed by Tenant at Tenant's sole cost and expense in accordance
with and subject to the provisions of Article 3. All of the provisions of this
Lease shall apply to the installation, use and maintenance of the Temporary
Generator, including all provisions relating to compliance with Legal
Requirements, insurance, indemnity, repairs and maintenance. Tenant acknowledges
and agrees that the privileges granted Tenant under this Section 9.11(c) shall
merely constitute a license and shall not, now or at any time after the
installation of the Temporary Generator, be deemed to grant Tenant a leasehold
or other real property interest in the Building or any portion thereof,
including the Building loading dock. Tenant further acknowledges and agrees that
the license granted to Tenant under this Section 9.11(c) shall automatically
terminate and expire in accordance with the terms of this Section 9.11(c) and
the termination of such license shall be self-operative and no further
instrument shall be required to effect such termination.

     SECTION 9.12 CONDUIT. Landlord will make available to Tenant, without
additional charge, riser space sufficient to accommodate (a) the electrical
conduits required in order to deliver electric power from the basement of the
Building to the Premises and (b) the electrical conduits required in order to
connect Tenant's Generator to the Premises. If Tenant requires additional riser
space for electrical conduits, telecommunications and fiber optic lines or for
use in connection with the Roof Equipment, then upon request by Tenant, subject
to availability of riser space in the Building, Landlord will make available
riser space at Landlord's then-current rates for riser space in the Building,
which rates are currently as follows: (i) for riser space not exceeding two
inches (2") in diameter, an annual charge of $5.00 per lineal foot, and (ii) for
riser space in excess of two inches (2") in diameter but not exceeding four
inches (4") in diameter, an annual charge of $7.50 per lineal foot. All work in
connection with the installation of such conduit, including core drilling, if
required, shall be performed by Tenant at Tenant's sole cost and expense,
including the cost of a fire watch and related supervisory costs relating to any
core drilling, which shall be performed in such a manner and at such times as
Landlord shall prescribe. Landlord shall make available to Tenant reasonable
access within the Building core for purposes of such installation work.

                                      -30-
<PAGE>   31

               ARTICLE 10.   INSURANCE

               SECTION 10.1 Tenant, at its expense, shall obtain and keep in
full force and effect a policy of commercial general liability insurance under
which Tenant is named as the insured and Landlord, Landlord's managing agent for
the Building, and any Lessors and any Mortgagees (whose names shall have been
furnished to Tenant) are named as additional insureds, which insurance shall
provide primary coverage without contribution from any other insurance carried
by or for the benefit of Landlord, Landlord's managing agent or any Lessors or
Mortgagees named as additional insureds. Tenant's primary commercial general
liability policy shall contain a provision that the policy shall be
noncancelable unless twenty (20) days' written notice shall have been given to
Landlord and Landlord shall similarly receive twenty (20) days' notice of any
material change in coverage. The minimum limits of liability shall be a combined
single limit with respect to each occurrence in an amount of not less than
$5,000,000 per location general aggregate limit; provided, however, that
Landlord shall retain the right to require Tenant to increase said coverage to
that amount of insurance which in Landlord's reasonable judgment is then being
customarily required by prudent landlords of comparable buildings in the City of
New York, and provided further that Landlord shall require similar increases of
other tenants of space in the Building comparable to the Premises, to the extent
Landlord shall then have the right to do so under applicable leases. Tenant
shall also obtain and keep in full force and effect during the Term, (a)
insurance against loss or damage by fire, and such other risks and hazards as
are insurable under then available standard forms of "all risk" insurance
policies with extended coverage, to Tenant's Property and Tenant's Alterations
for the full insurable value thereof or on a replacement cost basis; (b)
Workers' Compensation Insurance, as required by law; (c) New York Disability
Benefits Law Policy; and (d) such other insurance in such amounts as Landlord,
any Mortgagee or Lessor may reasonably require from time to time. All insurance
required to be carried by Tenant pursuant to the terms of this Lease shall be
effected under valid and enforceable policies issued by reputable and
independent insurers permitted to do business in the State of New York, and
rated in Best's Insurance Guide, or any successor thereto (or if there be none,
an organization having a national reputation) as having a Best's Rating" of "A-"
and a "Financial Size Category" of at least "XI" or if such ratings are not then
in effect, the equivalent thereof.

               SECTION 10.2 (a) The parties hereto do hereby waive, any and all
rights of recovery against the other, or against the officers, employees,
partners, agents and representatives of the other, for loss of or damage to the
property of the waiving party to the extent such loss or damage is insured
against under any insurance policy carried by Landlord or Tenant hereunder. In
addition, the parties hereto shall procure an appropriate clause in, or
endorsement on, any fire or extended coverage insurance covering the Premises,
the Building and personal property, fixtures and equipment located thereon or
therein, pursuant to which the insurance companies waive subrogation or consent
to a waiver of right of recovery and subject to obtaining such clauses or
endorsements of waiver of subrogation or consent to a waiver of right of
recovery, hereby agree not to make any claim against or seek to recover from the
other for any loss or damage to its property or the property of others resulting
from fire or other hazards covered by such fire and extended coverage insurance;
provided, however, that the release, discharge, exoneration and covenant not to
sue herein contained shall be limited by and coextensive with the terms and
provisions of the waiver of subrogation clause or endorsements or clauses or
endorsements consenting to a waiver of right of recovery. If the payment of an
additional


                                      -31-
<PAGE>   32

premium is required for the inclusion of such waiver of subrogation or consent
to waiver provision, each party shall advise the other of the amount of any such
additional premiums and the other party at its own election may, but shall not
be obligated to, pay the same. If such other party shall not elect to pay such
additional premium, the first party shall not be required to obtain such waiver
of subrogation or consent to waiver provision. Tenant acknowledges that Landlord
shall not carry insurance on and shall not be responsible for damage to,
Tenant's Alterations (if any) or Tenant's Property, and that Landlord shall not
carry insurance against, or be responsible for any loss suffered by Tenant due
to, interruption of Tenant's business.

               (b) As to each party hereto, provided such party's right of full
recovery under the applicable insurance policy is not adversely affected, such
party hereby releases the other (its servants, agents, contractors, employees
and invitees) with respect to any claim (including a claim for negligence) which
it might otherwise have against the other party for loss, damages or destruction
of the type covered by such insurance with respect to its property by fire or
other casualty i.e. in the case of Landlord, as to the Building, and, in the
case of Tenant, as to Tenant's Property and Tenant's Alterations (including
rental value or business interruption, as the case may be) occurring during the
Term of this Lease.

               SECTION 10.3 On or prior to the Commencement Date, Tenant shall
deliver to Landlord appropriate certificates of insurance required to be carried
by Tenant pursuant to this Article 10, including evidence of waivers of
subrogation required pursuant to Section 10.2. Evidence of each renewal or
replacement of a policy shall be delivered by Tenant to Landlord at least twenty
(20) days prior to the expiration of such policy.

               SECTION 10.4 Landlord agrees to maintain (a) insurance against
loss or damage to the Building by fire and such other risks and hazards as are
insurable under then available forms of "all risk" insurance policies with
extended coverage, and (b) a policy of commercial general liability insurance
with minimum limits of liability in amounts comparable to insurance maintained
by other prudent landlords of comparable office buildings in the City of New
York.

               ARTICLE 11. DESTRUCTION OF THE PREMISES; PROPERTY LOSS OR DAMAGE

               SECTION 11.1 If the Premises shall be damaged by fire or other
casualty, or if the Building shall be so damaged that Tenant shall be deprived
of reasonable access to the Premises, Tenant shall give prompt notice thereof to
Landlord, and the damage shall be repaired (i) by and at the expense of Landlord
as to the core, shell, floors, roof, curtain wall and other structural elements
of the Building located in the Premises and Building Systems servicing the
Premises (the "Base Building Restoration"), and (ii) by and at the expense of
Tenant as to all other elements of the Premises, including Tenant's Alterations
and Tenant's Property. Commencing on the date of such fire or other casualty,
and until the Base Building Restoration shall be Substantially Completed, Fixed
Rent and Additional Rent shall be reduced in the proportion which the area of
the part of the Premises which is neither usable nor used by Tenant bears to the
total Premises Area. Landlord shall have no obligation to repair any damage to,
or to replace, any of Tenant's Alterations or Tenant's Property.

               SECTION 11.2 Anything contained in Section 11.1 to the contrary
notwithstanding, if the Premises are totally damaged or are rendered wholly
untenantable, and if



                                      -32-
<PAGE>   33

Landlord shall decide not to restore the Premises, or if the Building shall be
so damaged by fire or other casualty that, in Landlord's opinion, substantial
alteration, demolition, or reconstruction of the Building shall be required
(whether or not the Premises shall have been damaged or rendered untenantable),
then in any of such events, Landlord may, not later than sixty (60) days
following the date of the damage, give Tenant a notice in writing terminating
this Lease, provided Landlord similarly terminates the leases of other tenants
in the Building covering at least twenty-five percent (25%) of the Rentable
Square Footage of the then-leased portions of the Building. If this Lease is so
terminated, the Term shall expire upon the tenth (10th) day after such notice is
given, and Tenant shall vacate the Premises and surrender the same to Landlord.
Upon the termination of this Lease under the conditions provided for in this
Section 11.2, Tenant's liability for Fixed Rent and Additional Rent shall cease
as of the date of such fire or other casualty, and any prepaid portion of Fixed
Rent or Additional Rent for any period after such date shall be refunded by
Landlord to Tenant.

               SECTION 11.3 If the Premises are damaged by fire or other
casualty and are rendered wholly untenantable thereby, or if the Building shall
be so damaged that Tenant shall be deprived of reasonable access to the
Premises, and if Landlord shall elect to restore the Premises, Landlord shall,
within sixty (60) days following the date of the damage, cause a contractor or
architect selected by Landlord to give notice (the "Restoration Notice") to
Tenant of the date by which such contractor or architect believes the Base
Building Restoration shall be Substantially Completed. If the Restoration Notice
shall indicate that the Base Building Restoration shall not be Substantially
Completed on or before the date which shall be six (6) months following the date
of such damage or destruction, Tenant shall have the right to terminate this
Lease by giving written notice (the "Termination Notice") to Landlord not later
than thirty (30) days following receipt of the Restoration Notice. If Tenant
gives a Termination Notice, this Lease shall be deemed canceled and terminated
as of the date of the giving of the Termination Notice as if such date were the
Expiration Date, and Fixed Rent and Additional Rent shall be apportioned and
shall be paid or refunded, as the case may be up to and including the date of
such damage or destruction. If Tenant shall have had the right to give a
Termination Notice pursuant to this Section 11.3, but Tenant nonetheless shall
have failed to give a Termination Notice hereunder, and thereafter Landlord
fails to Substantially Complete the Base Building Restoration on or before the
date which is thirty (30) days following the date set forth in the Restoration
Notice, then Tenant shall again have the right to terminate this Lease by giving
a Termination Notice (a "Second Termination Notice"), and, unless Landlord
Substantially Completes the Base Building Restoration within thirty (30) days
following the giving of such Second Termination Notice, this Lease shall be
deemed canceled and terminated as set forth in this Section 11.3.
Notwithstanding anything set forth to the contrary in this Article 11, in the
event that a fire or other casualty rendering the Premises wholly untenantable
shall occur during the final year of the Term, either Landlord or Tenant may
terminate this Lease by giving the other party a Termination Notice as set forth
herein.

        SECTION 11.4 This Article 11 constitutes an express agreement governing
any case of damage or destruction of the Premises or the Building by fire or
other casualty, and Section 227 of the Real Property Law of the State of New
York, which provides for such contingency in the absence of an express
agreement, and any other law of like nature and purpose now or hereafter in
force shall have no application in any such case.


                                      -33-
<PAGE>   34

               ARTICLE 12.   EMINENT DOMAIN

               SECTION 12.1 If (a) all of the floor area of the Premises, or so
much thereof as shall render the Premises wholly untenantable, shall be acquired
or condemned for any public or quasi-public use or purpose, or (b) a portion of
the Real Property, not including the Premises, shall be so acquired or
condemned, but by reason of such acquisition or condemnation, Tenant no longer
has means of access to the Premises, then this Lease and the Term shall end as
of the date of the vesting of title with the same effect as if that date were
the Expiration Date. In the event of any termination of this Lease and the Term
pursuant to the provisions of this Article 12, Fixed Rent and Additional Rent
shall be apportioned as of the date of sooner termination and any prepaid
portion of Fixed Rent or Additional Rent for any period after such date shall be
refunded by Landlord to Tenant.

               SECTION 12.2 In the event of any such acquisition or condemnation
of all or any part of the Real Property, Landlord shall be entitled to receive
the entire award for any such acquisition or condemnation. Tenant shall have no
claim against Landlord or the condemning authority for the value of any
unexpired portion of the Term or Tenant's Alterations, and Tenant hereby
expressly assigns to Landlord all of its right in and to any such award. Nothing
contained in this Section 12.2 shall be deemed to prevent Tenant from making a
separate claim in any condemnation proceedings for the then value of any
Tenant's Property included in such taking and for any moving expenses, provided
such award shall be made by the condemning authority in addition to, and shall
not result in a reduction of, the award made by it to Landlord.

               SECTION 12.3 If only a part of the Real Property shall be so
acquired or condemned then, subject to Section 12.1, this Lease and the Term
shall continue in force and effect. If a part of the Premises shall be so
acquired or condemned and this Lease and the Term shall not be terminated,
Landlord, at Landlord's expense, shall restore that part of the Premises not so
acquired or condemned so as to constitute tenantable Premises. From and after
the date of the vesting of title, Fixed Rent and Additional Rent shall be
reduced in the proportion which the area of the part of the Premises so acquired
or condemned bears to the total area of the Premises immediately prior to such
acquisition or condemnation.

               ARTICLE 13.   ASSIGNMENT AND SUBLETTING

               SECTION 13.1 Except as otherwise expressly provided herein, 
Tenant, for itself, its heirs, distributees, executors, administrators, legal
representatives, successors and assigns, expressly covenants that it shall not
assign, mortgage, pledge, encumber, or otherwise transfer this Lease, nor sublet
(nor underlet), nor suffer, nor permit the Premises or any part thereof to be
used or occupied by others (whether for desk space, mailing privileges or
otherwise), without the prior written consent of Landlord in each instance. If
this Lease is assigned, or if the Premises or any part thereof are sublet or
occupied by anybody other than Tenant, or if this Lease or the Premises or
Tenant's personal property are encumbered (whether by operation of law or
otherwise) without Landlord's consent, then Landlord may, after default by
Tenant, collect rent from the assignee, subtenant or occupant, and apply the net
amount collected to Fixed Rent and Additional Rent, but no assignment,
subletting, occupancy or collection shall be deemed a waiver by Landlord of the
provisions hereof, the acceptance by Landlord of the assignee, subtenant or
occupant as a tenant, or a release by Landlord of Tenant from the further
performance by Tenant



                                      -34-
<PAGE>   35

its obligations under this Lease, and Tenant shall remain fully liable therefor.
Notwithstanding the foregoing sentence, Landlord acknowledges that Tenant shall
have the right, from time to time, to grant security interests in and to
Tenant's personal property located in the Premises, provided that no such
security interest shall ever attach to any part of the Real Property. The
consent by Landlord to any assignment or subletting shall not in any way be
construed to relieve Tenant from obtaining the express consent in writing of
Landlord to any further assignment or subletting. In no event shall any
permitted subtenant assign or encumber its sublease or further sublet all or any
portion of its sublet space, or otherwise suffer or permit the sublet space or
any part thereof to be used or occupied by others, without Landlord's prior
written consent in each instance. Any assignment, sublease, mortgage, pledge,
encumbrance or transfer in contravention of the provisions of this Article 13
shall be void.

               SECTION 13.2 If Tenant shall, at any time or from time to time,
during the Term desire to assign this Lease or sublet all or part of the
Premises, Tenant shall give notice (a "Tenant's Notice") thereof to Landlord,
which Tenant's Notice shall set forth: (a) with respect to an assignment of this
Lease, the date Tenant desires the assignment to be effective and any
consideration Tenant would receive under such assignment, (b) with respect to a
sublet of all or a part of the Premises (i) the dates upon which Tenant desires
the sublease term to commence and expire, (ii) the rental rate and other
material business terms upon which Tenant would sublet such premises, and (iii)
a description of the Premises showing the portion to be sublet, the effective or
commencement date of which shall be not less than thirty (30) nor more than one
hundred and eighty (180) days after the giving of such notice, (c) a statement
setting forth in reasonable detail the identity of the proposed assignee or
subtenant, the nature of its business and its proposed use of the Premises, (d)
current financial information with respect to the proposed assignee or
subtenant, including its most recent financial report, (e) a true and complete
copy of the proposed assignment or sublease and any other agreements relating
thereto, and (f) an agreement by Tenant to indemnify Landlord against liability
resulting from any claims that may be made against Landlord by the proposed
assignee or subtenant or by any brokers or other Persons claiming a commission
or similar compensation in connection with the proposed assignment or sublease.
Tenant's Notice shall be deemed an offer from Tenant to Landlord whereby
Landlord (or Landlord's designee) may, at its option, (I) sublease such space
(the "Leaseback Space") from Tenant upon the terms and conditions set forth in
Section 13.4, or terminate the Lease with respect to only the Leaseback Space,
or (II) if the proposed transaction is (1) an assignment of this Lease, or (2) a
subletting of fifty percent (50%) or more of the rentable area of the Premises,
terminate this Lease. Said options may be exercised by Landlord by notice given
to Tenant at any time within sixty (60) days after Tenant's Notice has been
given by Tenant to Landlord, and during such sixty-day period, Tenant shall not
assign this Lease nor sublet such space to any Person other than Landlord.
Notwithstanding the foregoing, Tenant shall not be required to obtain Landlord's
consent as described in Section 13.1 and Landlord shall not have the right to
exercise the option described in this Section 13.2 with respect to a sublease
demising not more than twenty percent (20%) of the Premises Area (an "Excepted
Sublease"), provided that the area so subleased shall not be separately demised
nor have an entrance or reception area separate from the remainder of the
Premises; provided, further, that any Excepted Sublease shall be subject to all
of the other terms and conditions of this Article 13.

                SECTION 13.3 If Landlord exercises its option to terminate this 
Lease with respect to all or a portion of the Premises pursuant to Section 13.2,
then this Lease shall end and expire



                                      -35-
<PAGE>   36

on the date that such assignment or sublease was to be effective or commence, as
the case may be, and the Fixed Rent and Additional Rent due hereunder shall be
paid and apportioned to such date. In such event, Landlord and Tenant, upon
request of either party, shall enter into an amendment of this Lease ratifying
and confirming such total or partial termination, and setting forth appropriate
modifications, if any, to the terms and provisions hereof. Following such
termination, Landlord shall be free to and shall have no liability to Tenant if
Landlord should lease the Premises (or any part thereof) to Tenant's prospective
assignee or subtenant.

               SECTION 13.4 If Landlord exercises its option to sublet the
Leaseback Space, such sublease to Landlord or its designee (as subtenant) shall
be at a rental rate equal to the product of (i) the lesser of (A) the rental
rate per rentable square foot of Fixed Rent and Additional Rent then payable
pursuant to this Lease, or (B) the rental rate per rentable square foot of rent
and additional rent set forth in Tenant's Notice, multiplied by (ii) the number
of rentable square feet of the Leaseback Space, and shall be for the same term
as that of the proposed subletting, and such sublease shall:

                      (a) be upon such other terms and conditions as are
        contained in Tenant's Notice, and be expressly subject to all of the
        covenants, agreements, terms, provisions and conditions of this Lease,
        except such as are irrelevant or inapplicable, and except as expressly
        set forth in this Article 13 to the contrary;

                      (b) give the subtenant the unqualified and unrestricted
        right, without Tenant's permission, to assign such sublease or any
        interest therein and/or to sublet the space covered by such sublease or
        any part or parts of such space and to make any and all changes,
        alterations and improvements in the space covered by such sublease, and
        if the proposed sublease will result in all or substantially all of the
        Premises being sublet, grant Landlord or its designee the option to
        extend the term of such sublease for the balance of the Term of this
        Lease less one day;

                      (c) provide that any assignee or further subtenant of
        Landlord or its designee, may, at Landlord's option, be permitted to
        make alterations, decorations and installations in such space or any
        part thereof and shall also provide in substance that any such
        alterations, decorations and installations in such space therein made by
        any assignee or subtenant of Landlord or its designee may be removed, in
        whole or in part, by such assignee or subtenant, at its option, prior to
        or upon the expiration or other termination of such sublease; provided,
        however, that such assignee or subtenant shall, at its sole cost and
        expense, repair any damage and injury caused by such removal; and

                      (d) provide that (i) the parties to such sublease
        expressly negate any intention that any estate created under such
        sublease be merged with any other estate held by either of said parties,
        (ii) any assignment or sublease by Landlord or its designee (as the
        subtenant) may be for any purpose or purposes that Landlord, in
        Landlord's uncontrolled discretion, shall deem suitable or appropriate,
        (iii) Tenant shall, at Tenant's sole cost and expense, at all times
        provide and permit reasonably appropriate means of ingress to and egress
        from such space so sublet by Tenant to Landlord or its designee, (iv)
        Landlord may, at Tenant's sole cost and expense, make such alterations
        as may be required or deemed necessary by Landlord to physically
        separate the subleased space


                                      -36-
<PAGE>   37

        from the balance of the Premises and to comply with any legal or
        insurance requirements relating to such separation, and (v) that at the
        expiration of the term of such sublease, Tenant will accept the space
        covered by such sublease in its then existing condition, subject to the
        obligations of the subtenant to make such repairs thereto as may be
        necessary to preserve the premises demised by such sublease in good
        order and condition.

               SECTION 13.5 (a) If Landlord exercises its option to sublet the
Leaseback Space, Landlord shall indemnify and save Tenant harmless from all
obligations under this Lease as to the Leaseback Space during the period of time
it is so sublet to Landlord, except as to any obligation which arises out of or
results from the negligence or willful misconduct of Tenant, or any of its
agents, servants or employees.

               (b) Performance by Landlord, or its designee, under a sublease of
the Leaseback Space shall be deemed performance by Tenant of any similar
obligation under this Lease and any default under any such sublease shall not
give rise to a default under a similar obligation contained in this Lease nor
shall Tenant be liable for any default under this Lease or deemed to be in
default hereunder if such default is occasioned by or arises from any act or
omission of the tenant under such sublease or is occasioned by or arises from
any act or omission of any occupant holding under or pursuant to any such
sublease.

               (c) Tenant shall have no obligation, at the expiration or earlier
termination of the Term, to remove any alteration, installation or improvement
made in the Leaseback Space by Landlord (or Landlord's designee).

               (d) Any consent required of Tenant, as Landlord under the
sublease, shall be deemed granted if consent with respect thereto is granted by
Landlord under this Lease, and any failure of Landlord (or its designee) to
comply with the provisions of the sublease other than with respect to the
payment of Fixed Rent and Additional Rent to Tenant, shall not constitute a
default thereunder or hereunder if Landlord shall have consented to such
non-compliance.

               (e) Tenant shall have no obligation to provide to Landlord or
Landlord's designee any services other than those services provided by Landlord
to Tenant under this Lease. Tenant shall have the right to contract directly
with Landlord or Landlord's designee to purchase additional services which
Tenant provides to itself at the Premises.

               SECTION 13.6 In the event Landlord does not exercise either
option provided to it pursuant to Section 13.2, or if Tenant shall request
consent to enter into an Excepted Sublease, and provided that no Event of
Default shall have occurred and be continuing under this Lease as of the time
Landlord's consent is requested by Tenant, Landlord's consent (which must be in
writing and in form and substance satisfactory to Landlord) to the proposed
assignment or sublease shall not be unreasonably withheld or delayed; provided,
however, that:

               (a) Tenant shall have complied with the provisions of Section
13.2 hereof and Landlord shall not have exercised any of its options thereunder
within the time permitted therefor;


                                      -37-
<PAGE>   38

                      (b) In Landlord's judgment, the proposed assignee or
        subtenant is engaged in a business or activity, and the Premises, or the
        relevant part thereof, will be used in a manner, which (i) is in keeping
        with the then standards of the Building, and (ii) does not violate the
        restrictions set forth in Article 2;

                      (c) The proposed assignee or subtenant is a reputable
        Person with sufficient financial worth considering the responsibility
        involved, and Landlord has been furnished with evidence thereof;

                      (d) In the event Landlord has reasonably comparable space
        in the Building available for lease, then (i) neither the proposed
        assignee or subtenant nor any Person which, directly or indirectly,
        controls, is controlled by, or is under common control with, the
        proposed assignee or subtenant, is then an occupant of any part of the
        Building, and (ii) the proposed assignee or subtenant is not a Person
        (or Affiliate of a Person) with whom Landlord or Landlord's agent is
        then, or has been within the previous six (6) month period, negotiating
        in connection with rental of space in the Building;

                      (e) The form of the proposed sublease or instrument of
        assignment shall be reasonably satisfactory to Landlord and shall comply
        with the applicable provisions of this Article 13, and Tenant shall
        deliver a true and complete original, fully executed counterpart of such
        sublease or other instrument to Landlord promptly upon the execution and
        delivery thereof;

                      (f) Tenant and its proposed subtenant or assignee, as the
        case may be, shall execute and deliver to Landlord an agreement, in form
        and substance satisfactory to Landlord, setting forth the terms and
        conditions upon which Landlord shall have granted its consent to such
        assignment or subletting, and the agreement of Tenant and such subtenant
        or assignee, as the case may be, to be bound by the provisions of this
        Article 13;

                      (g) There shall not be more than three (3) subtenants of
        the Premises;

                      (h) The amount of the aggregate rent to be paid by the
        proposed subtenant shall not be less than the then current market rent
        per rentable square foot for the Premises, determined as though the
        Premises were vacant, and the rental and other terms and conditions of
        the sublease shall be substantially the same as those contained in
        Tenant's Notice;

                      (i) Tenant shall reimburse Landlord, as Additional Rent 
        upon demand, for (A) the reasonable costs and expenses incurred by
        Landlord in connection with the assignment or sublease, including the
        costs of making investigations as to the acceptability of the proposed
        assignee or subtenant and the cost of reviewing plans and specifications
        proposed to be made in connection therewith, and (B) Landlord's
        reasonable out-of-pocket legal fees and disbursements incurred in
        connection with the granting of any requested consent and the
        preparation of Landlord's written consent to the sublease or assignment;



                                      -38-
<PAGE>   39

                      (j) Tenant shall not have (i) advertised or publicized in
        any way the availability of the Premises without prior notice of and
        approval by Landlord, or (ii) listed the Premises for sublease or
        assignment with a broker, agent or otherwise at a rental rate less than
        the fixed rent and additional rent at which Landlord is then offering to
        lease comparable space in the Building; and

                      (k) The proposed subtenant or assignee shall not be
        entitled, directly or indirectly, to diplomatic or sovereign immunity
        and shall be subject to the service of process in, and the jurisdiction
        of the courts of New York State.

Except for any sublease by Tenant to Landlord or its designee pursuant to this
Article 13, each sublease pursuant to this Section 13.6 shall be subject to all
of the covenants, agreements, terms, provisions and conditions contained in this
Lease. Notwithstanding any such sublease to Landlord or any such sublease to any
other subtenant, or any acceptance of Fixed Rent or Additional Rent by Landlord
from any subtenant, Tenant will remain fully liable for the payment of the Fixed
Rent and Additional Rent due and to become due hereunder and for the performance
of all the covenants, agreements, terms, provisions and conditions contained in
this Lease on Tenant's part to be observed and performed, and for all acts and
omissions of any licensee or subtenant or anyone claiming under or through any
subtenant which shall be in violation of any of the obligations of this Lease,
and any such violation shall be deemed to be a violation by Tenant. If Landlord
shall decline to give its consent to any proposed assignment or sublease, or if
Landlord shall exercise either of its options under Section 13.2, Tenant shall
indemnify, defend and hold harmless Landlord against and from any and all
losses, liabilities, damages, costs, and expenses (including attorneys' fees and
disbursements) resulting from any claims that may be made against Landlord by
the proposed assignee or subtenant arising from or in connection with such
proposed assignment or subletting, or by any brokers or other Persons (with whom
Tenant or its proposed assignee or subtenant may have dealt) claiming a
commission or similar compensation in connection with the proposed assignment or
sublease.

               SECTION 13.7 In the event that (a) Landlord fails to exercise
either of its options under Section 13.2 and consents to a proposed assignment
or sublease, and (b) Tenant fails to execute and deliver the assignment or
sublease to which Landlord consented within one hundred twenty (120) days after
the giving of such consent, then, Tenant shall again comply with all of the
provisions and conditions of Section 13.2 before assigning this Lease or
subletting all or part of the Premises.

               SECTION 13.8 With respect to each and every sublease authorized
by Landlord under the provisions of this Lease, it is further agreed that:

               (a) No sublease shall be for a term ending later than one day
        prior to the Expiration Date of this Lease;

               (b) No sublease shall be delivered, and no subtenant shall take
        possession of the Premises or any part thereof, until an executed
        counterpart of such sublease has been delivered to Landlord and approved
        in writing by Landlord; and


                                      -39-
<PAGE>   40

               (c) Each sublease shall be subject and subordinate to this Lease
        and to the matters to which this Lease is or shall be subordinate, and
        each subtenant by entering into a sublease is deemed to have agreed that
        in the event of termination, re-entry or dispossession by Landlord under
        this Lease, Landlord may, at its option, take over all of the right,
        title and interest of Tenant, as sublandlord, under such sublease, and
        such subtenant shall, at Landlord's option, attorn to Landlord pursuant
        to the then executory provisions of such sublease, except that Landlord
        shall not (i) be liable for any previous act or omission of Tenant under
        such sublease, (ii) be subject to any counterclaim, offset or defense,
        not expressly provided in such sublease, which theretofore accrued to
        such subtenant against Tenant, (iii) be bound by any previous
        modification of such sublease or by any previous prepayment of more than
        one month's Fixed Rent or of any Additional Rent, or (iv) be obligated
        to perform any work in the subleased space or to prepare it for
        occupancy, and in connection with such attornment, the subtenant shall
        execute and deliver to Landlord any instruments Landlord may reasonably
        request to evidence and confirm such attornment. Each subtenant or
        licensee of Tenant shall be deemed, automatically upon and as a
        condition of its occupying or using the Premises or any part thereof, to
        have agreed to be bound by the terms and conditions set forth in this
        Article 13. The provisions of this Article 13 shall be self-operative
        and no further instrument shall be required to give effect to this
        provision.

               SECTION 13.9 If Landlord shall consent to any assignment of this
Lease or to any sublease, or if Tenant shall enter into any other assignment or
sublease permitted hereunder, Tenant shall, in consideration therefor, pay to
Landlord, as Additional Rent:

               (a) In the case of an assignment, on the effective date of the
        assignment, an amount equal to fifty percent (50%) of (i) all sums and
        other consideration paid to Tenant by the assignee for or by reason of
        such assignment (including sums paid for Tenant's Property, less, in the
        case of a sale of Tenant's Property, the then net unamortized or
        undepreciated cost thereof, determined on the basis of Tenant's federal
        income tax returns) less (ii)(A) all expenses reasonably and actually
        incurred by Tenant on account of brokerage commissions and attorneys'
        fees in connection with such assignment, (B) the costs of improvements
        or Alterations made by Tenant solely for the purpose of preparing the
        Premises or a portion thereof for such assignment, and (C) any amounts
        attributable to rent concessions, free rent periods or rent abatements;
        or

               (b) In the case of a sublease, an amount equal to fifty percent 
        (50%) of (i) all rents, additional charges or other consideration
        payable to Tenant under the sublease in excess of the Fixed Rent and
        Additional Rent accruing during the term of the sublease in respect of
        the subleased space (at the rate per square foot payable by Tenant
        hereunder) pursuant to the terms hereof (including sums paid for the
        sale or rental of Tenant's Property, less, in the case of the sale of
        Tenant's Property, the net unamortized or undepreciated cost thereof,
        determined on the basis of Tenant's federal income tax returns) less
        (ii)(A) all expenses reasonably and actually incurred by Tenant on
        account of brokerage commissions and attorneys' fees in connection with
        such sublease, (B) the costs of improvements or Alterations made by
        Tenant solely for the purpose of preparing the Premises or a portion
        thereof for such sublease, and (C) any amounts attributable to rent
        concessions, free rent periods or rent abatements, which amounts shall,
        for purposes



                                      -40-
<PAGE>   41

        of calculating amounts payable by tenant hereunder, be amortized over
        the term of such sublease. The sums payable under this clause shall be
        paid by Tenant to Landlord as Additional Rent as and when payable by the
        subtenant to Tenant.

               SECTION 13.10 (a) If Tenant is a corporation (but not a public
corporation), the provisions of Section 13.1 shall apply to a transfer (by one
or more transfer(s)), of a majority of the stock of Tenant as if such transfer
of a majority of the stock of Tenant were an assignment of this Lease. It is
expressly understood that the term "transfer(s)" shall be deemed to include the
issuance of new stock which results in a majority of the stock of Tenant being
held by Persons which do not hold a majority of the stock of Tenant on the date
hereof. The provisions of this Article 13 shall not apply to transactions with a
corporation into or with which Tenant is merged or consolidated or to which
substantially all of Tenant's assets are transferred; provided, however, that
(i) such transfer shall have been made for a legitimate independent business
purpose and not for the principal purpose of transferring this Lease, (ii) the
successor to Tenant shall have a net worth, computed in accordance with
generally accepted accounting principles, at least equal to the greater of (A)
the net worth of Tenant immediately prior to such merger, consolidation or
transfer, or (B) the net worth of Tenant herein named on the date of this Lease,
and (iii) proof satisfactory to Landlord of such net worth shall have been
delivered to Landlord at least ten (10) days prior to the effective date of any
such transaction.

               (b) If Tenant is a partnership, the provisions of Section 13.1
shall apply to a transfer (by one or more transfers) of a majority interest in
the partnership, as if such transfer were an assignment of this Lease.

               (c) The limitations set forth in this Section 13.10 shall be
deemed to apply to subtenant(s), assignee(s) and guarantor(s) of this Lease, if
any, and any transfer by any such Person in violation of this Section 13.10
shall be deemed to be a transfer in violation of Section 13.1.

               (d) A modification, amendment or extension of a sublease shall be
deemed a sublease for the purposes of Section 13.1, and a takeover agreement
shall be deemed a transfer of this Lease for the purposes of Section 13.1.

               SECTION 13.11 Tenant may, without Landlord's consent, but upon
not less than ten (10) days' prior notice to Landlord, permit any Affiliate of
Tenant to sublet all or part of the Premises for any Permitted Use, or assign
this Lease to any Affiliate, subject however to compliance with Tenant's
obligations under this Lease. No such sublease shall be deemed to vest in any
such Affiliate any right or interest in this Lease or the Premises nor shall it
relieve, release, impair or discharge any of Tenant's obligations hereunder.

                SECTION 13.12 (a) Any assignment or transfer, whether made with 
Landlord's consent pursuant to Section 13.1 or without Landlord's consent to the
extent permitted under Sections 13.10 and 13.11, shall be made only if, and
shall not be effective until, the assignee shall execute, acknowledge and
deliver to Landlord an agreement in form and substance satisfactory to Landlord
whereby the assignee shall assume the obligations of this Lease on the part of
Tenant to be performed or observed from and after the effective date of such
assignment or transfer, and whereby the assignee shall agree that the provisions
in Section 13.1 shall,


                                      -41-
<PAGE>   42

notwithstanding such assignment or transfer, continue to be binding upon it in
respect of all future assignments and transfers.

               (b) The joint and several liability of Tenant and any immediate
or remote successor in interest of Tenant and the due performance of the
obligations of this Lease on Tenant's part to be performed or observed shall not
be discharged, released or impaired in any respect by any agreement or
stipulation made by Landlord, or any grantee or assignee of Landlord by way of
mortgage or otherwise, extending the time, or modifying any of the obligations
of this Lease, or by any waiver or failure of Landlord, or any grantee or
assignee of Landlord by way of mortgage or otherwise, to enforce any of the
obligations of this Lease.

               (c) The listing of any name other than that of Tenant, whether on
the doors of the Premises or the Building directory, or otherwise, shall not
operate to vest any right or interest in this Lease or in the Premises, nor
shall it be deemed to be the consent of Landlord to any assignment or transfer
of this Lease or to any sublease of Premises or to the use or occupancy thereof
by others. Any such listing shall constitute a privilege extended by Landlord,
revocable at Landlord's will by notice to Tenant, provided that Landlord shall
not unreasonably revoke such privilege as to any Affiliate of Tenant, or any
subtenant of Tenant or assignee of this Lease approved by Landlord pursuant to
this Article 13.

               SECTION 13.13 Landlord acknowledges that the collocation of
communications equipment not owned by Tenant at the Premises shall not
constitute an assignment or sublease requiring the consent of Landlord
hereunder. For purposes of this Lease, "collocation" means the installation by
Tenant's customers of telecommunications equipment in Tenant's facilities
therefor, in the ordinary course of Tenant's business, for which such customers
pay fees based upon access to such facilities. In no event shall any collocation
arrangement entered into by Tenant entail the construction of a separate
entrance to the Premises from the Building common corridor for any party thereto
other than Tenant.

               ARTICLE 14.   ACCESS TO PREMISES

               SECTION 14.1 Tenant shall permit Landlord, Landlord's agents and 
public utilities servicing the Building to erect, use and maintain concealed
ducts, pipes and conduits in and through the Premises, provided such work is
performed by Landlord in a manner so as to minimize any interference that might
be occasioned to Tenant's business operations and to minimize any damage that
might result to the Premises, Tenant's Alterations or Tenant's Property.
Landlord shall promptly repair any damage to the Premises, Tenant's Alterations
or Tenant's Property caused by any work performed by Landlord pursuant to this
Article 14; provided, however, that Landlord shall have no obligation to employ
contractors or labor at overtime or other premium pay rates or to incur any
other overtime costs or additional expenses whatsoever, unless Tenant shall
first pay to Landlord as Additional Rent Landlord's reasonable estimate of any
excess costs and expenses incurred by Landlord in employing such overtime or
premium rate labor, and shall thereafter reimburse Landlord for any additional
costs and expenses incurred by Landlord in excess of such estimated amount.
Landlord or Landlord's agents shall have the right to enter the Premises at all
reasonable times upon reasonable prior notice (except no such prior notice shall
be required in case of emergency), which notice may be oral, to examine the
same, to show them to prospective purchasers, Mortgagees, Lessors or



                                      -42-
<PAGE>   43

lessees of the Building and their respective agents and representatives or
prospective tenants of the Premises, and to make such repairs, alterations,
improvements or additions (a) as Landlord may deem necessary or desirable to the
Premises or to any other portion of the Building, or (b) which Landlord may
elect to perform following Tenant's failure to make repairs or perform any work
which Tenant is obligated to make or perform under this Lease, or (c) for the
purpose of complying with Legal Requirements, and Landlord shall be allowed to
take all material into and upon the Premises that may be required therefor
without the same constituting an eviction or constructive eviction of Tenant in
whole or in part and, except as and to the extent provided in Section 5.4, Fixed
Rent and Additional Rent will not be abated while said repairs, alterations,
improvements or additions are being made, by reason of loss or interruption of
business of Tenant, or otherwise.

               SECTION 14.2 If Tenant shall not be present when for any reason
entry into the Premises shall be necessary or permissible, Landlord or
Landlord's agents may enter the same without rendering Landlord or such agents
liable therefor (if during such entry Landlord or Landlord's agents shall accord
reasonable care to Tenant's property), and without in any manner affecting this
Lease. Nothing herein contained, however, shall be deemed or construed to impose
upon Landlord any obligation, responsibility or liability whatsoever for the
care, supervision or repair of the Building or any part thereof, other than as
herein provided.

               SECTION 14.3 Landlord shall have the right from time to time to
alter the Building and, without the same constituting an actual or constructive
eviction and without incurring any liability to Tenant therefor, to change the
arrangement or location of entrances or passageways, doors and doorways, and
corridors, elevators, stairs, toilets, or other public parts of the Building and
to change the name, number or designation by which the Building is commonly
known. All parts (except surfaces facing the interior of the Premises) of all
walls, windows and doors bounding the Premises (including exterior Building
walls, exterior core corridor walls, exterior doors and entrances other than
doors and entrances solely servicing the Premises), all balconies, terraces and
roofs adjacent to the Premises, all space in or adjacent to the Premises used
for shafts, stacks, stairways, chutes, pipes, conduits, ducts, fan rooms,
heating, air cooling, plumbing and other mechanical facilities, service closets
and other Building facilities are not part of the Premises, and Landlord shall
have the use thereof, as well as access thereto through the Premises for the
purposes of operation, maintenance, alteration and repair.

               ARTICLE 15.   CERTIFICATE OF OCCUPANCY

                Tenant shall not at any time use or occupy the Premises in 
violation of the certificate of occupancy (a true and correct copy of which has
been delivered to Tenant) at such time issued for the Premises or for the
Building and in the event that any department of the City or State of New York
shall hereafter contend or declare by notice, violation, order or in any other
manner whatsoever that the Premises are used for a purpose which is a violation
of such certificate of occupancy, Tenant shall, upon five (5) days' written
notice from Landlord or any Governmental Authority, immediately discontinue such
use of the Premises. Failure by Tenant to discontinue such use after such notice
shall be considered a default in the fulfillment of a material covenant of this
Lease and Landlord shall have the right to terminate this Lease immediately, and
in addition thereto shall have the right to exercise any and all rights and



                                      -43-
<PAGE>   44

privileges and remedies given to Landlord by and pursuant to the provisions of
Articles 16 and 17.

               ARTICLE 16.   DEFAULT

               SECTION 16.1 Each of the following events shall be an "Event of
Default" hereunder:

                      (a) if Tenant defaults in the payment when due of any
        installment of Fixed Rent or Additional Rent, and such default shall
        continue for a period of seven (7) days after notice thereof from
        Landlord; provided, however, that if Tenant shall default in the timely
        payment of Fixed Rent or Additional Rent, and any such default shall
        occur more than two (2) times in any period of twelve (12) consecutive
        months, then, notwithstanding that such defaults shall have each been
        cured within the applicable period provided above, upon any further
        similar default, Landlord may serve a three days' notice of termination
        upon Tenant without affording to Tenant an opportunity to cure such
        further default; or

                      (b) if Tenant's interest in this Lease is transferred in
        violation of Article 13; or

                      (c) if the Premises or a substantial portion thereof
         becomes abandoned; or

                      (d) (i) if Tenant admits in writing its inability to pay
         its debts as they become due; or

                      (ii) if Tenant commences or institutes any case,
               proceeding or other action (A) seeking relief as a debtor, or to
               adjudicate it a bankrupt or insolvent, or seeking reorganization,
               arrangement, adjustment, winding-up, liquidation, dissolution,
               composition or other relief with respect to it or its debts under
               any existing or future law of any jurisdiction, domestic or
               foreign, relating to bankruptcy, insolvency, reorganization or
               relief of debtors, or (B) seeking appointment of a receiver,
               trustee, custodian or other similar official for it or for all or
               any substantial part of its property; or

                      (iii) if Tenant makes a general assignment for the benefit
               of creditors; or

                      (iv) if any case, proceeding or other action is commenced 
                or instituted against Tenant (A) seeking to have an order for
                relief entered against it as debtor or to adjudicate it a
                bankrupt or insolvent, or seeking reorganization, arrangement,
                adjustment, winding-up, liquidation, dissolution, composition or
                other relief with respect to it or its debts under any existing
                or future law of any jurisdiction, domestic or foreign, relating
                to bankruptcy, insolvency, reorganization or relief of debtors,
                or (B) seeking appointment of a receiver, trustee, custodian or
                other similar official for it or for all or any substantial part
                of its property, which either (1) results in any such entry of
                an order for relief, adjudication of bankruptcy or


                                      -44-
<PAGE>   45

                insolvency or such an appointment or the issuance or entry of
                any other order having a similar effect, or (2) remains
                undismissed for a period of ninety (90) days; or

                      (v) if any case, proceeding or other action is commenced
               or instituted against Tenant seeking issuance of a warrant of
               attachment, execution, distraint or similar process against all
               or any substantial part of its property which results in the
               entry of an order for any such relief which has not been vacated,
               discharged, or stayed or bonded pending appeal within ninety (90)
               days from the entry thereof; or

                      (vi) if Tenant takes any action in furtherance of, or
               indicating its consent to, approval of, or acquiescence in, any
               of the acts set forth in clauses (ii), (iii), (iv) or (v) of
               Section 16.1(d); or

                      (vii) if a trustee, receiver or other custodian is
               appointed for any substantial part of the assets of Tenant, which
               appointment is not vacated or effectively stayed within seven (7)
               Business Days, or if any such vacating or stay does not
               thereafter remain in effect; or

                      (e) if Tenant defaults in the observance or performance of
        any other term, covenant or condition of this Lease on Tenant's part to
        be observed or performed and Tenant fails to remedy such default within
        thirty (30) days after notice by Landlord to Tenant of such default, or,
        if such default is of such a nature that it cannot be completely
        remedied within said period of thirty (30) days, if Tenant fails to
        commence to remedy such default within such thirty-day period, or fails
        thereafter to diligently prosecute to completion all steps necessary to
        remedy such default; or

                      (f) if Tenant or any Affiliate of Tenant defaults beyond
        applicable grace and notice periods in the payment of any fixed rent or
        additional rent under any other lease of space in the Building, or if
        any such lease is terminated by Landlord as a result of a default by the
        tenant thereunder.

        SECTION 16.2 (a) If an Event of Default occurs, Landlord may at any time
thereafter give written notice to Tenant stating that this Lease and the Term
shall expire and terminate on the date specified in such notice, which date
shall not be less than seven (7) days after the giving of such notice. If
Landlord gives such notice, this Lease and the Term and all rights of Tenant
under this Lease shall expire and terminate as if the date set forth in such
notice were the Fixed Expiration Date and Tenant immediately shall quit and
surrender the Premises, but Tenant shall remain liable as hereinafter provided.
Anything contained herein to the contrary notwithstanding, if such termination
shall be stayed by order of any court having jurisdiction over any proceeding
described in Section 16.1(d), or by federal or state statute, then, following
the expiration of any such stay, or if the trustee appointed in any such
proceeding, Tenant or Tenant as debtor-in-possession shall fail to assume
Tenant's obligations under this Lease within the period prescribed therefor by
law or within one hundred twenty (120) days after entry of the order for relief
or as may be allowed by the court, or if said trustee, Tenant or Tenant as
debtor-in-possession shall fail to provide adequate protection of Landlord's
right, title and interest in and to the Premises or adequate assurance of the
complete and continuous future



                                      -45-
<PAGE>   46

performance of Tenant's obligations under this Lease, Landlord, to the extent
permitted by law or by leave of the court having jurisdiction over such
proceeding, shall have the right, at its election, to terminate this Lease on
seven (7) days' notice to Tenant, Tenant as debtor-in-possession or said trustee
and upon the expiration of said seven (7) day period this Lease shall cease and
expire as set forth above and Tenant, Tenant as debtor-in-possession or said
trustee shall immediately quit and surrender the Premises as aforesaid.

               SECTION 16.3 If, at any time, (a) Tenant shall comprise two (2)
or more Persons, (b) Tenant's obligations under this Lease shall have been
guaranteed by any Person other than Tenant, or (c) Tenant's interest in this
Lease shall have been assigned, the word "Tenant," as used in Section 16.1(d),
shall be deemed to mean any one or more of the Persons primarily or secondarily
liable for Tenant's obligations under this Lease. Any monies received by
Landlord from or on behalf of Tenant during the pendency of any proceeding of
the types referred to in Section 16.1(d) shall be deemed paid as compensation
for the use and occupation of the Premises and the acceptance of any such
compensation by Landlord shall not be deemed an acceptance of Fixed Rent and/or
Additional Rent or a waiver on the part of Landlord of any rights under this
Lease.

               ARTICLE 17.   REMEDIES AND DAMAGES

               SECTION 17.1 (a) If an Event of Default shall occur, and this
Lease and the Term shall expire and come to an end as provided in Article 16:

               (i) Tenant shall quit and peacefully surrender the Premises to
        Landlord, and Landlord and its agents may immediately, or at any time
        after such Event of Default or after the date upon which this Lease and
        the Term shall expire and come to an end, re-enter the Premises or any
        part thereof, without notice, either by summary proceedings, or by any
        other applicable action or proceeding, or by legal force or other legal
        means (without being liable to indictment, prosecution or damages
        therefor), and may repossess the Premises and dispossess Tenant and any
        other Persons from the Premises and remove any and all of their property
        and effects from the Premises; and

                (ii) Landlord, at Landlord's option, may relet the whole or any 
        part or parts of the Premises from time to time, either in the name of
        Landlord or otherwise, to such tenant or tenants, for such term or terms
        ending before, on or after the Expiration Date, at such rental or
        rentals and upon such other conditions, which may include concessions
        and free rent periods, as Landlord, in its sole discretion, may
        determine; provided, however, that Landlord shall have no obligation to
        relet the Premises or any part thereof and shall in no event be liable
        for refusal or failure to relet the Premises or any part thereof, or, in
        the event of any such reletting, for refusal or failure to collect any
        rent due upon any such reletting, and no such refusal or failure shall
        operate to relieve Tenant of any liability under this Lease or otherwise
        affect any such liability, and Landlord, at Landlord's option, may make
        such repairs, replacements, alterations, additions, improvements,
        decorations and other physical changes in and to the Premises as
        Landlord, in its sole discretion, considers advisable or necessary in
        connection with any such reletting or proposed reletting, without
        relieving Tenant of any liability under this Lease or otherwise
        affecting any such liability.



                                      -46-
<PAGE>   47

               (b) Tenant hereby waives the service of any notice of intention
to re-enter or to institute legal proceedings to that end which may otherwise be
required to be given under any present or future law. Tenant, on its own behalf
and on behalf of all Persons claiming through or under Tenant, including all
creditors, does further hereby waive any and all rights which Tenant and all
such Persons might otherwise have under any present or future law to redeem the
Premises, or to re-enter or repossess the Premises, or to restore the operation
of this Lease, after (i) Tenant shall have been dispossessed by a judgment or by
warrant of any court or judge, (ii) any re-entry by Landlord, or (iii) any
expiration or termination of this Lease and the Term, whether such dispossess,
re-entry, expiration or termination shall be by operation of law or pursuant to
the provisions of this Lease. The words "re-enter," re-entry" and "re-entered"
as used in this Lease shall not be deemed to be restricted to their technical
legal meanings. In the event of a breach or threatened breach by Tenant, or any
Persons claiming through or under Tenant, of any term, covenant or condition of
this Lease, Landlord shall have the right to enjoin such breach and the right to
invoke any other remedy allowed by law or in equity as if re-entry, summary
proceedings and other special remedies were not provided in this Lease for such
breach. The rights to invoke the remedies hereinbefore set forth are cumulative
and shall not preclude Landlord from invoking any other remedy allowed at law or
in equity.

               SECTION 17.2 (a) If this Lease and the Term shall expire and come
to an end as provided in Article 16, or by or under any summary proceeding or
any other action or proceeding, or if Landlord shall re-enter the Premises
pursuant to legal process as provided in Section 17.1, or by or under any
summary proceeding or any other action or proceeding, then, in any of such
events:

               (i) Tenant shall pay to Landlord all Fixed Rent and Additional
        Rent payable under this Lease by Tenant to Landlord to the date upon
        which this Lease and the Term shall have expired and come to an end or
        to the date of re-entry upon the Premises by Landlord, as the case may
        be;

               (ii) Tenant also shall be liable for and shall pay to Landlord,
        as damages, any deficiency (the "Deficiency") between (A) Fixed Rent and
        Additional Rent for the period which otherwise would have constituted
        the unexpired portion of the Term (conclusively presuming the Additional
        Rent for each year thereof to be the same as was payable for the year
        immediately preceding such termination or re-entry), and (B) the net
        amount, if any, of rents collected under any reletting effected pursuant
        to the provisions of Section 17.1(a)(ii) for any part of such period
        (first deducting from the rents collected under any such reletting all
        of Landlord's expenses in connection with the termination of this Lease,
        Landlord's re-entry upon the Premises and with such reletting including
        all repossession costs, brokerage commissions, legal expenses,
        attorneys' fees and disbursements, alteration costs and other expenses
        of preparing the Premises for such reletting). Tenant shall pay the
        Deficiency in monthly installments on the days specified in this Lease
        for payment of installments of Fixed Rent, and Landlord shall be
        entitled to recover from Tenant each monthly Deficiency as the same
        shall arise. No suit to collect the amount of the Deficiency for any
        month shall prejudice Landlord's right to collect the Deficiency for any
        subsequent month by a similar proceeding; and



                                      -47-
<PAGE>   48

               (iii) whether or not Landlord shall have collected any monthly
        Deficiency as aforesaid, Landlord shall be entitled to recover from
        Tenant, and Tenant shall pay to Landlord, on demand, in lieu of any
        further Deficiency as and for liquidated and agreed final damages, a sum
        equal (A) to the amount by which the Fixed Rent and Additional Rent for
        the period which otherwise would have constituted the unexpired portion
        of the Term (conclusively presuming the Additional Rent for each year
        thereof to be the same as was payable for the year immediately preceding
        such termination or re-entry) exceeds (B) the then fair and reasonable
        rental value of the Premises, including Additional Rent for the same
        period, both discounted to present value at the rate of four percent
        (4%) per annum less (C) the aggregate amount of Deficiencies previously
        collected by Landlord pursuant to the provisions of Section 17.2(a)(ii)
        for the same period. If, before presentation of proof of such liquidated
        damages to any court, commission or tribunal, Landlord shall have relet
        the Premises or any part thereof for the period which otherwise would
        have constituted the unexpired portion of the Term, or any part thereof,
        the amount of net rents collected in connection with such reletting
        shall be deemed, prima facie, to be the fair and reasonable rental value
        for the part or the whole of the Premises so relet during the term of
        the reletting.

               (b) If Landlord shall relet the Premises, or any part thereof,
together with other space in the Building, the net rents collected under any
such reletting and the expenses of any such reletting shall be equitably
apportioned for the purposes of this Section 17.2. Tenant shall in no event be
entitled to any rents collected or payable under any reletting, whether or not
such rents shall exceed the Fixed Rent reserved in this Lease. Nothing contained
in Article 16 or this Article 17 shall be deemed to limit or preclude the
recovery by Landlord from Tenant of the maximum amount allowed to be obtained as
damages by any statute or rule of law, or of any sums or damages to which
Landlord may be entitled in addition to the damages set forth in this Section
17.2.

               ARTICLE 18.   FEES AND EXPENSES

               SECTION 18.1 If an Event of Default shall occur under this Lease
or if Tenant shall do or permit to be done any act or thing upon the Premises
which would cause Landlord to be in default under any Superior Lease or
Mortgage, or if Tenant shall fail to comply with its obligations under this
Lease and the preservation of property or the safety of any tenant, occupant or
other person is threatened, Landlord may, after reasonable prior notice to
Tenant except in an emergency, perform the same for the account of Tenant or
make any expenditure or incur any obligation for the payment of money for the
account of Tenant. All amounts expended by Landlord in connection with the
foregoing, including reasonable attorneys' fees and disbursements in
instituting, prosecuting or defending any action or proceeding or recovering
possession, and the cost thereof, with interest thereon at the Default Rate,
shall be deemed to be Additional Rent hereunder and shall be paid by Tenant to
Landlord within ten (10) days of rendition of any bill or statement to Tenant
therefor.

               SECTION 18.2 If Tenant shall fail to pay any installment of
Fixed Rent and/or Additional Rent when due, Tenant shall pay to Landlord, in
addition to such installment of Fixed Rent and/or Additional Rent, as the case
may be, as a late charge and as Additional Rent, a sum



                                      -48-
<PAGE>   49

equal to interest at the Default Rate on the amount unpaid, computed from the
date such payment was due to and including the date of payment.

               ARTICLE 19.   NO REPRESENTATIONS BY LANDLORD

               Landlord and Landlord's agents have made no warranties,
representations, statements or promises with respect to (a) the rentable and
usable areas of the Premises or the Building, (b) the amount of any current or
future Labor Rates or Taxes, (c) the compliance with applicable Requirements of
the Premises or the Building, or (d) the suitability of the Premises for any
particular use or purpose. No rights, easements or licenses are acquired by
Tenant under this Lease, by implication or otherwise, except as expressly set
forth herein. This Lease (including any Exhibits referred to herein and all
supplementary agreements provided for herein) contains the entire agreement
between the parties and all understandings and agreements previously made
between Landlord and Tenant are merged in this Lease, which alone fully and
completely expresses their agreement. Tenant is entering into this Lease after
full investigation, and is not relying upon any statement or representation made
by Landlord not embodied in this Lease.

               ARTICLE 20.   END OF TERM

               SECTION 20.1 Upon the Expiration Date or other termination of
this Lease, Tenant shall quit and surrender to Landlord the Premises, vacant,
broom clean, in good order and condition, ordinary wear and tear and damage for
which Tenant is not responsible under the terms of this Lease excepted, and
Tenant shall remove all of Tenant's Property in accordance with the provisions
of Section 3.3, and this obligation shall survive the expiration or sooner
termination of the Term. If the last day of the Term or any renewal thereof
falls on Saturday or Sunday, this Lease shall expire on the Business Day
immediately preceding. Tenant expressly waives, for itself and for any Person
claiming through or under Tenant, any rights which Tenant or any such Person may
have under the provisions of Section 2201 of the New York Civil Practice Law and
Rules and of any successor law of like import then in force in connection with
any holdover summary proceedings which Landlord may institute to enforce the
foregoing provisions of this Article 20.

                 SECTION 20.2 Tenant acknowledges that Tenant or any subtenant
of Tenant remaining in possession of the Premises after the expiration or
earlier termination of this Lease would create an unusual hardship for Landlord
and for any prospective tenant. Tenant, therefore, covenants that if for any
reason Tenant or any subtenant of Tenant shall fail to vacate and surrender
possession of the Premises or any part thereof on or before the expiration or
earlier termination of this Lease and the Term, then Tenant's continued
possession of the Premises shall be as a "month-to-month" tenant, during which
time, without prejudice and in addition to any other rights and remedies
Landlord may have hereunder or at law, Tenant shall pay to Landlord for each
month and for each portion of any month during which Tenant holds over, an
amount equal to: (a) one hundred twenty-five percent (125%) of the total monthly
amount of Fixed Rent and Additional Rent payable hereunder immediately prior to
such termination (the "Existing Rent") for the first thirty (30) days during
which Tenant holds over, (b) one hundred fifty percent (150%) of the Existing
Rent for the next thirty (30) days during which Tenant holds over, and (c) two
hundred percent (200%) of the Existing Rent thereafter. The provisions of this
Section 20.2 shall not in any way be deemed to (a) permit Tenant to remain in
possession of the Premises after

                                      -49-
<PAGE>   50

the Expiration Date or sooner termination of this Lease or (b) imply any right
of Tenant to use or occupy the Premises upon expiration or termination of this
Lease and the Term, and no acceptance by Landlord of payments from Tenant after
the Expiration Date or sooner termination of the Term shall be deemed to be
other than on account of the amount to be paid by Tenant in accordance with the
provisions of this Article 20. Tenant's obligations under this Article shall
survive the expiration or earlier termination of this Lease.

               ARTICLE 21.   QUIET ENJOYMENT

               Provided no Event of Default has occurred and is continuing,
Tenant may peaceably and quietly enjoy the Premises without hindrance by
Landlord or any Person lawfully claiming through or under Landlord, subject,
nevertheless, to the terms and conditions of this Lease.

               ARTICLE 22.   NO WAIVER; NON-LIABILITY

               SECTION 22.1 No act or thing done by Landlord or Landlord's
agents during the Term shall be deemed an acceptance of a surrender of the
Premises, and no agreement to accept such surrender shall be valid unless in
writing and signed by Landlord. No employee of Landlord or of Landlord's agents
shall have any power to accept the keys of the Premises prior to the termination
of this Lease. The delivery of keys to any employee of Landlord or of Landlord's
agents shall not operate as a termination of this Lease or a surrender of the
Premises. Any Building employee to whom any property shall be entrusted by or on
behalf of Tenant shall be deemed to be acting as Tenant's agent with respect to
such property and neither Landlord nor its agents shall be liable for any damage
to property of Tenant or of others entrusted to employees of the Building, nor
for the loss of or damage to any property of Tenant by theft or otherwise.

               SECTION 22.2 The failure of Landlord to seek redress for
violation of, or to insist upon the strict performance of, any covenant or
condition of this Lease, or any of the Rules and Regulations set forth or
hereafter adopted by Landlord, shall not prevent a subsequent act, which would
have originally constituted a violation, from having all of the force and effect
of an original violation. The receipt by Landlord of Fixed Rent and/or
Additional Rent with knowledge of the breach of any covenant of this Lease shall
not be deemed a waiver of such breach. The failure of Landlord to enforce any of
the Rules and Regulations set forth, or hereafter adopted, against Tenant or any
other tenant in the Building shall not be deemed a waiver of any such Rules and
Regulations. Landlord shall not enforce the Rules and Regulations against Tenant
in a discriminatory manner. No provision of this Lease shall be deemed to have
been waived by Landlord, unless such waiver be in writing signed by Landlord. No
payment by Tenant or receipt by Landlord of a lesser amount than the monthly
Fixed Rent or any Additional Rent shall be deemed to be other than on account of
the next installment of Fixed Rent or Additional Rent, as the case may be, or as
Landlord may elect to apply same, nor shall any endorsement or statement on any
check or any letter accompanying any check or payment as Fixed Rent or
Additional Rent be deemed an accord and satisfaction, and Landlord may accept
such check or payment without prejudice to Landlord's right to recover the
balance of such Fixed Rent or Additional Rent or pursue any other remedy in this
Lease provided. Any executory agreement hereafter made shall be ineffective to
change, modify, discharge or effect an abandonment of this Lease in whole or in
part unless such executory agreement is in writing and



                                      -50-
<PAGE>   51

signed by the party against whom enforcement of the change, modification,
discharge or abandonment is sought. All references in this Lease to the consent
or approval of Landlord shall be deemed to mean the written consent or approval
of Landlord and no consent or approval of Landlord shall be effective for any
purpose unless such consent or approval is set forth in a written instrument
executed by Landlord.

               SECTION 22.3 (a) Neither Landlord nor its agents shall be liable
for any injury or damage to persons or property or interruption of Tenant's
business resulting from fire, explosion, falling plaster, steam, gas,
electricity, water, rain or snow or leaks from any part of the Building or from
the pipes, appliances or plumbing works or from the roof, street or subsurface
or from any other place or by dampness or by any other cause of whatsoever
nature; nor shall Landlord or its agents be liable for any such damage caused by
other tenants or persons in the Building or caused by construction of any
private, public or quasi-public work; nor shall Landlord be liable for any
latent defect in the Premises or in the Building (except that Landlord shall be
required to repair the same to the extent provided in Article 5). Nothing in the
foregoing shall affect any right of Landlord to the indemnity from Tenant to
which Landlord may be entitled under Article 28 in order to recoup for payments
made to compensate for losses of third parties.

               (b) If, at any time or from time to time, any windows of the
Premises are temporarily closed, darkened or bricked-up for any reason
whatsoever, or any of such windows are permanently closed, darkened or
bricked-up if required by any Legal Requirement or related to any construction
upon property adjacent to the Real Property by parties other than Landlord,
Landlord shall not be liable for any damage Tenant may sustain thereby and
Tenant shall not be entitled to any compensation therefor nor abatement of Fixed
Rent or Additional Rent nor shall the same release Tenant from its obligations
hereunder nor constitute an eviction or constructive eviction of Tenant from the
Premises.

               ARTICLE 23.   WAIVER OF TRIAL BY JURY

               The respective parties hereto shall and they hereby do waive
trial by jury in any action, proceeding or counterclaim brought by either of the
parties hereto against the other (except for personal injury or property damage)
on any matters whatsoever arising out of or in any way connected with this
Lease, the relationship of Landlord and Tenant, Tenant's use or occupancy of the
Premises, or for the enforcement of any remedy under any statute, emergency or
otherwise. If Landlord commences any summary proceeding against Tenant, Tenant
will not interpose any counterclaim of whatever nature or description in any
such proceeding (unless failure to impose such counterclaim would preclude
Tenant from asserting in a separate action the claim which is the subject of
such counterclaim), and will not seek to consolidate such proceeding with any
other action which may have been or will be brought in any other court by
Tenant.

               ARTICLE 24.   INABILITY TO PERFORM

               This Lease and the obligation of Tenant to pay Fixed Rent and
Additional Rent hereunder and perform all of the other covenants and agreements
hereunder on the part of Tenant to be performed will not be affected, impaired
or excused because Landlord is unable to fulfill any of its obligations under
this Lease expressly or impliedly to be performed by Landlord



                                      -51-
<PAGE>   52

or because Landlord is unable to make, or is delayed in making any repairs,
additions, alterations, improvements or decorations or is unable to supply or is
delayed in supplying any equipment or fixtures, if Landlord is prevented or
delayed from so doing by reason of strikes or labor troubles or by accident, or
by any cause whatsoever reasonably beyond Landlord's control, including laws,
governmental preemption in connection with a national emergency or by reason of
any Legal Requirements or by reason of the conditions of supply and demand which
have been or are affected by war or other emergency ("Unavoidable Delays").

               ARTICLE 25.   BILLS AND NOTICES

               Except as otherwise expressly provided in this Lease, any bills,
statements, consents, notices, demands, requests or other communications given
or required to be given under this Lease shall be in writing and shall be deemed
sufficiently given or rendered if delivered by hand (against a signed receipt),
sent by a nationally recognized overnight courier service, or sent by registered
or certified mail (return receipt requested) and addressed:

                if to Tenant, (a) at Tenant's address set forth on page 1 of
        this Lease, or (b) at any place where Tenant or any agent or employee or
        Tenant may be found if mailed subsequent to Tenant's abandoning or
        surrendering the Premises, with a copies to (i) Tenant at the Premises,
        and (ii) McPharlin, Sprinkles & Thomas LLP, Ten Almaden Boulevard, Suite
        1460 San Jose, California 95113, Attention: N. Dave Thomas, Esq.; or

                if to Landlord, as follows: 111 Eighth Avenue LLC, c/o Taconic
        Investment Partners LLC, 1500 Broadway, New York, New York 10036,
        Attention: Mr. Paul Pariser, with a copy to: Schulte Roth & Zabel LLP,
        900 Third Avenue, New York, New York 10022, Attention: Robert S. Nash,
        Esq.

Any such bill, statement, consent, notice, demand, request or other
communication given as provided in this Article 25 shall be deemed to have been
rendered or given (i) on the date when it shall have been hand delivered, (ii)
three (3) Business Days from the date when it shall have been mailed, or (iii)
one (1) Business Day from the date when it shall have been sent by overnight
courier service.

               ARTICLE 26.   RULES AND REGULATIONS

               Landlord reserves the right, from time to time, to adopt
additional reasonable and non-discriminatory Rules and Regulations and to amend
the Rules and Regulations then in effect. Tenant and Tenant's contractors,
employees, agents, and licensees shall comply with the Rules and Regulations, as
so supplemented or amended. Nothing contained in this Lease shall be construed
to impose upon Landlord any duty or obligation to enforce the Rules and
Regulations or terms, covenants or conditions in any other lease against any
other tenant, and Landlord shall not be liable to Tenant for violation of the
same by any other tenant, its employees, agents, visitors or licensees. If there
shall be any inconsistencies between this Lease and the Rules and Regulations,
the provisions of this Lease shall prevail.

ARTICLE 27.    BROKER


                                      -52-
<PAGE>   53

               SECTION 27.1 Each of Landlord and Tenant represents and warrants
to the other that it has not dealt with any broker in connection with this Lease
other than Insignia/Edward S. Gordon Company, Inc., as Landlord's agent, and
Markley Stearns Partners, as Tenant's broker (collectively, "Broker") and that
to the best of its knowledge and belief, no other broker, finder or similar
Person procured or negotiated this Lease or is entitled to any fee or commission
in connection herewith.

               SECTION 27.2 Each of Landlord and Tenant shall indemnify, defend,
protect and hold the other party harmless from and against any and all losses,
liabilities, damages, claims, judgments, fines, suits, demands, costs, interest
and expenses of any kind or nature (including reasonable attorneys' fees and
disbursements) which the indemnified party may incur by reason of any claim of
or liability to any broker, finder or like agent (other than Broker) arising out
of any dealings claimed to have occurred between the indemnifying party and the
claimant in connection with this Lease, or the above representation being false.
The provisions of this Article 27 shall survive the expiration or earlier
termination of the Term of this Lease.

               ARTICLE 28.   INDEMNITY

               SECTION 28.1 (a) Tenant shall not do or permit any act or thing
to be done upon the Premises which may subject Landlord to any liability or
responsibility for injury, damages to persons or property or to any liability by
reason of any violation of law or of any Legal Requirement, but shall exercise
such control over the Premises as to fully protect Landlord against any such
liability. Tenant shall defend, indemnify and save harmless Landlord from and
against (i) all claims of whatever nature against Landlord arising from any act,
omission or negligence of Tenant, its contractors, licensees, agents, servants,
employees, invitees or visitors, (ii) all claims against Landlord arising from
any accident, injury or damage whatsoever caused to any person or to the
property of any person and occurring during the Term in the Premises, (iii) all
claims against Landlord arising from any accident, injury or damage occurring
outside of the Premises but anywhere within or about the Real Property, where
such accident, injury or damage results or is claimed to have resulted from an
act, omission or negligence of Tenant or Tenant's agents, employees, and (iv)
any breach, violation or nonperformance of any covenant, condition or agreement
in this Lease set forth and contained on the part of Tenant to be fulfilled,
kept, observed and performed. This indemnity and hold harmless agreement shall
include indemnity from and against any and all liability, fines, suits, demands,
costs and expenses of any kind or nature (including attorneys' fees and
disbursements) incurred in or in connection with any such claim or proceeding
brought thereon, and the defense thereof.

                (b) Subject to Section 10.2, Landlord shall indemnify, defend
and hold harmless Tenant and all Tenant Parties from and against all claims
against Tenant or any Tenant Party arising from any accident, injury or damage
whatsoever caused to any person or the property of any person in or about the
common or public areas of the Building for which Tenant shall not be liable in
accordance with Section 28.1(a) above (specifically excluding the Premises).
This indemnity and hold harmless agreement shall include indemnity from and
against any and all liability, fines, suits, demands, costs and expenses of any
kind or nature (including attorneys' fees and disbursements) incurred in or in
connection with any such claim or proceeding brought thereon, and the defense
thereof.



                                      -53-
<PAGE>   54

               SECTION 28.2 Tenant agrees to defend, indemnify and hold harmless
Landlord and any partner, shareholder, director, officer, principal, employee or
agent, directly and indirectly, of Landlord, from and against all obligations
(including removal and remedial actions), losses, claims, suits, judgments,
liabilities, penalties, damages (including consequential and punitive damages),
costs and expenses (including attorneys' and consultants' fees and expenses) of
any kind or nature whatsoever that may at any time be incurred by, imposed on or
asserted against Landlord or any such party directly or indirectly based on, or
arising or resulting from (a) the actual or alleged presence of Hazardous
Materials on the Premises or in the Building which is caused or permitted by
Tenant, and (b) any Environmental Claim arising from Tenant's operation or use
of the Premises or the Building. The provisions of this Section 28.2 shall
survive the expiration or sooner termination of this Lease.

               ARTICLE 29.   SECURITY DEPOSIT

               SECTION 29.1 Tenant has deposited with Landlord the sum of One
Million and 00/100 Dollars ($1,000,000.00) as security for the full and faithful
performance of every provision of this Lease to be performed by Tenant (all or
any part of such amount, the "Security Deposit"). If an Event of Default shall
have occurred with respect to any provision of this Lease, including but not
limited to the provisions relating to the payment of Fixed Rent and Additional
Rent, Landlord may use, apply or retain all or any part of this Security Deposit
for the payment of any Fixed or Additional Rent or any other sum in default or
for the payment of any other amount which Landlord may spend or become obligated
to spend by reason of such Event of Default, or to compensate Landlord for any
other loss, cost or damage which Landlord may suffer by reason of such Event of
Default. Landlord shall give Tenant notice contemporaneously with such use or
application of any portion of the Security Deposit. Tenant shall, within five
(5) days after the giving of such notice, deposit with Landlord cash in an
amount sufficient to restore the Security Deposit to the amount then required
pursuant to the terms of this Article 29 (Tenant's obligation to make such
payment shall be deemed a requirement that Tenant pay an item of Additional
Rent) and Tenant's failure to do so shall be a breach of this Lease. Landlord
shall not, unless otherwise required by Legal Requirements, pay interest to
Tenant on the Security Deposit, and if Landlord is required to maintain the
Security Deposit in an interest bearing account, Landlord will retain the
maximum amount permitted under Legal Requirements as a bookkeeping and
administrative charge. Tenant shall not assign or encumber any part of the
Security Deposit, and no assignment or encumbrance by Tenant of all of any part
of the Security Deposit shall be binding upon Landlord, whether made prior to,
during, or after the Term. Landlord shall not be required to exhaust its
remedies against Tenant or against the Security Deposit before having recourse
to any other form of security held by Landlord and recourse by Landlord to any
Security Deposit shall not affect any remedies of Landlord which are provided in
this Lease or which are available to Landlord in law or in equity. If Tenant
shall fully and faithfully perform every covenant and provision of this Lease to
be performed and observed by Tenant, the Security Deposit or any balance thereof
shall be returned to Tenant reasonably promptly after the expiration or sooner
termination (other than a termination pursuant to Article 16) of the Term and
Tenant's surrender to Landlord of the Premises. In the event the Building is
sold, Landlord shall transfer the Security Deposit to the new owner and Landlord
shall thereupon be released by Tenant from all liability for the return of said
Security Deposit; and Tenant agrees to look to the new owner solely for the
return of the Security Deposit. A lease of the entire Building shall be



                                      -54-
<PAGE>   55

deemed a transfer within the meaning of the foregoing sentence. Landlord shall
use reasonable efforts to notify or cause Tenant to be notified in the event of
any transfer of the Building.

               SECTION 29.2 In lieu of a cash deposit, Tenant may deliver to
Landlord a clean, irrevocable, non-documentary and unconditional Letter of
Credit issued by and drawn upon any commercial bank, trust company, national
banking association or savings and loan association having offices for banking
purposes in the City of New York and which is a member of the New York
Clearinghouse Association (the "Issuing Bank") and which (or the parent company
of which) shall have outstanding unsecured, uninsured and unguaranteed
indebtedness, or shall have issued a letter of credit or other credit facility
that constitutes the primary security for any outstanding indebtedness (which is
otherwise uninsured and unguaranteed), that is then rated, without regard to
qualification of such rating by symbols such as "+" or "-" or numerical
notation, "Aa" or better by Moody's Investors Service and "AA" or better by
Standard & Poor's Corporation, and has combined capital, surplus and undivided
profits of not less than $500,000,000.00, which Letter of Credit shall have a
term of not less than one year, be in form and content satisfactory to Landlord
(and substantially as shown on Exhibit D attached hereto and made a part
hereof), be for the account of Landlord, be in the amount of the Security
Deposit then required to be deposited hereunder, and be fully transferable by
Landlord to successor owners of the Building without the payment of any fees or
charges, it being agreed that if any such fees or charges shall be so imposed,
then such fees or charges, shall be paid by Tenant. The Letter of Credit shall
provide that it shall be deemed automatically renewed, without amendment, for
consecutive periods of one year each thereafter during the term of this Lease,
unless the Issuing Bank sends notice (the "Non-Renewal Notice") to Landlord by
certified mail, return receipt requested, not less than thirty (30) days next
preceding the then expiration date of the Letter of Credit that it elects not to
have such Letter of Credit renewed. Additionally, the Letter of Credit shall
provide that Landlord shall have the right, exercisable within twenty (20) days
of its receipt of the Non-Renewal Notice, by sight draft on the Issuing Bank, to
receive the monies represented by the existing Letter of Credit and to hold such
proceeds pursuant to the terms of this Section 29.2 as a cash security pending
the replacement of such Letter of Credit. If an Event of Default shall have
occurred and be continuing with respect to any provision of this Lease,
including but not limited to the provisions relating to the payment of Fixed
Rent and Additional Rent, Landlord may apply or retain the whole or any part of
the cash security so deposited or may notify the Issuing Bank and thereupon
receive all the monies represented by the Letter of Credit and use, apply, or
retain the whole or any part of such proceeds, as provided in this Section 29.2.
Any portion of the cash proceeds of the Letter of Credit not so used or applied
by Landlord in satisfaction of the obligations of Tenant as to which such Event
of Default shall have occurred shall be deposited by Landlord and retained in an
interest-bearing account as provided in Section 29.1. If Landlord applies or
retains any part of the cash security or proceeds of the Letter of Credit, as
the case may be, Tenant shall, within five (5) days after written demand
therefor, deposit with Landlord the amount so applied or retained so that
Landlord shall have the full Security Deposit required pursuant to Section 29.1
on hand at all times during the Term. If Tenant shall fully and faithfully
comply with all of the terms, provisions, covenants and conditions of this
Lease, the Letter of Credit shall be returned to Tenant after the Expiration
Date and after delivery of possession of the Premises to Landlord. In the event
of a sale of Landlord's interest in the Premises, within thirty (30) days of
notice of such sale or leasing, Tenant, at Tenant's sole cost and expense, shall
arrange for the transfer of the Letter of Credit to the new



                                      -55-
<PAGE>   56

landlord, as designated by Landlord, or have the Letter of Credit reissued in
the name of the new landlord and Landlord shall thereupon be released by Tenant
from all liability for the return of the Letter of Credit; provided, however,
that if the Letter of Credit is reissued, Landlord shall return the original
Letter of Credit issued in Landlord's name to Tenant.

               SECTION 29.3 Notwithstanding anything set forth in this Article
29 to the contrary, if at any time during the Term Tenant shall provide
reasonable evidence to Landlord that Tenant's audited net worth, computed in
accordance with generally accepted accounting principles, shall then exceed (and
shall have exceeded, for a period of twelve (12) consecutive months prior to
such date) Fifty Million Dollars ($50,000,000), then Landlord shall refund the
Security Deposit or return the Letter of Credit to Tenant, as applicable.

               ARTICLE 30.   RENEWAL OPTION

               SECTION 30.1 Tenant shall have the right, at its option (the
"Renewal Option"), to renew the initial term of this Lease, for the entire
Premises, for a renewal term (the "Renewal Term") commencing on the day
following the Expiration Date (the "Renewal Term Commencement Date") and
expiring on the fifth (5th) anniversary of the Expiration Date (the "Extended
Expiration Date"). Tenant shall have no right to exercise the Renewal Option
unless all of the following conditions have been satisfied on the date of the
Renewal Notice (as defined below) and on the Renewal Term Commencement Date:

               (a) No Event of Default shall have occurred and be continuing
        under this Lease; and

               (b) The named Tenant hereunder (or a permitted assignee,
        sublessee, successor or transferee pursuant to Section 13.11, but not
        any other assignee or successor tenant), its subsidiaries or affiliates
        shall occupy not less than seventy-five percent (75%) of the
        then-existing Premises Area.

               SECTION 30.2 If Tenant elects to renew this Lease for the Renewal
Term, Tenant shall exercise such option by sending to Landlord written notice
thereof (the "Renewal Notice"), by certified mail, return receipt requested, not
less than twelve (12) months prior to the Expiration Date, and time shall be of
the essence with respect to the giving of the Renewal Notice. If Tenant shall
send the Renewal Notice within the time and in the manner herein provided, this
Lease shall be deemed renewed for the Renewal Term upon the terms, covenants and
conditions contained in this Lease, with the exception of Fixed Rent.

               SECTION 30.3 Fixed Rent for the Renewal Term shall be determined
as of the date of the Renewal Notice and shall be ninety-five percent (95%) of
the annual fair market value of the Premises for the Renewal Term (the "FMV"),
determined in accordance with Section 30.4 of this Lease. During the Renewal
Term, Tenant shall pay Tenant's Tax Payment and Tenant's Labor Rate Payment in
accordance with the provisions of Article 6, except that (i) the Base Tax Year
shall be the Tax Year commencing on the July 1st immediately preceding the
Renewal Term Commencement Date, (ii) the Base Labor Year shall be the Comparison
Year commencing on the January 1st immediately preceding the Renewal Term
Commencement Date.



                                      -56-
<PAGE>   57

               SECTION 30.4 Within twenty (20) days after the giving by Tenant
of a Renewal Notice, Landlord will notify Tenant of the amount of the Fixed Rent
for the Renewal Term (the "Rental Notice"), which Rental Notice shall set forth
Landlord's calculation of 95% of the FMV for the Premises.

               SECTION 30.5 (a) If Tenant shall dispute Landlord's calculation
of the FMV as set forth in the Rental Notice, such dispute shall be submitted to
arbitration and shall be determined by a single arbitrator appointed in
accordance with the American Arbitration Association Real Estate Valuation
Arbitration Proceeding Rules. Such arbitrator shall be impartial and shall have
not less than ten (10) years' experience in the New York metropolitan area in a
calling related to the leasing of commercial space in buildings comparable to
the Building, and the fees of such arbitrator shall be shared by Landlord and
Tenant.

               (b) Within fifteen (15) days following the appointment of such
arbitrator, each party shall attend a hearing before such arbitrator wherein
each party shall submit a report setting forth its determination of the FMV,
together with such information on comparable rentals, or such other evidence, as
such party shall deem relevant.

               (c) The arbitrator shall, within fifteen (15) days following such
hearing and submission of evidence, render his or her decision by selecting the
determination of FMV submitted by either Landlord or Tenant which, in the
judgment of the arbitrator, most nearly reflects the FMV of the Premises for the
Renewal Term. It is expressly understood that the decision of such arbitrator
shall be final and binding upon the parties hereto.

               (d) For purposes of the determination of the FMV, the Premises
shall be considered in their "as is" condition, but Landlord or the arbitrator
shall take into account the availability of all Building services then serving
or available to serve the Premises. Additionally, Landlord or such arbitrator
shall take into account the then current rentals or occupancy fees which
Landlord shall then be receiving for the renting of or granting of use or
occupancy rights for comparable office space in the Building for the Permitted
Use, taking into account rent concessions, abatement periods and construction
allowances then being granted for comparable space. The determination of the FMV
for the Renewal Term shall be based on the assumptions and criteria stated in
this Article 30, and the arbitrator shall not have the power to add to, modify
or change any of the provisions of this Lease.

               (e) After a determination has been made of the FMV for the
Renewal Term, the parties shall execute and deliver to each other an agreement
setting forth the Fixed Rent therefor as hereinabove determined.

               (f) If the final determination of Fixed Rent for the Renewal
Term shall not be made on or before the Renewal Term Commencement Date in
accordance with the provisions of this Article 30, then pending such final
determination, Tenant shall pay as the Fixed Rent for the Premises the amount of
Fixed Rent as set forth by Landlord in the Rental Notice. If, based upon the
final determination of Fixed Rent as provided herein, the payments made by
Tenant on account of Fixed Rent were (i) less than the Fixed Rent as finally
determined in accordance with the provisions hereof, Tenant shall pay to
Landlord the amount of such deficiency within ten (10) days after demand
therefor, or (ii) greater than the Fixed Rent as finally determined in
accordance



                                      -57-
<PAGE>   58

with the provisions hereof, Landlord shall, at Landlord's option, either credit
the amount of such excess against the next installments of Fixed Rent due under
this Lease, or refund the amount of such excess to Tenant.

               ARTICLE 31.   [INTENTIONALLY OMITTED].

               ARTICLE 32.   MISCELLANEOUS

               SECTION 32.1 (a) The obligations of Landlord under this Lease
shall not be binding upon Landlord named herein after the sale, conveyance,
assignment or transfer by such Landlord (or upon any subsequent landlord after
the sale, conveyance, assignment or transfer by such subsequent landlord) of its
interest in the Building or the Real Property, as the case may be, and in the
event of any such sale, conveyance, assignment or transfer, Landlord shall be
and hereby is entirely freed and relieved of all covenants and obligations of
Landlord hereunder, and the transferee of Landlord's interest in the Building or
the Real Property, as the case may be, shall be deemed to have assumed all
obligations under this Lease, including claims accrued prior to such sale,
conveyance, assignment or transfer. Prior to any such sale, conveyance,
assignment or transfer, the liability of Landlord for Landlord's obligations
under this Lease shall be limited to Landlord's interest in the Real Property
and Tenant shall not look to any other property or assets of Landlord or the
property or assets of any of the Exculpated Parties (defined below) in seeking
either to enforce Landlord's obligations under this Lease or to satisfy a
judgment for Landlord's failure to perform such obligations.

               (b) Notwithstanding anything contained herein to the contrary,
Tenant shall look solely to Landlord to enforce Landlord's obligations hereunder
and no partner, shareholder, director, officer, principal, employee or agent,
directly and indirectly, of Landlord (collectively, the "Exculpated Parties")
shall be personally liable for the performance of Landlord's obligations under
this Lease. Tenant shall not seek any damages against any of the Exculpated
Parties.

               SECTION 32.2 Tenant may, upon notice to, without the prior
written consent of Landlord, subject Tenant's Property and all of Tenant's other
personal property, equipment and trade fixtures, to a security agreement (but
not a leasehold mortgage) to secure financing or other obligations which Tenant
may obtain or incur. Following an Event of Default hereunder, Landlord shall
exercise its remedies under this Lease, and shall provide Tenant's lender(s)
with a reasonable opportunity to enter upon the Premises for the purpose of
removing any property of Tenant which has been pledged as collateral to Tenant's
lender(s) or which has been subjected to any such security agreement, provided,
however that such lender shall be subject to the terms and provisions of this
Lease and the Rules and Regulations which apply to Tenant with respect to the
removal of Tenant's Property.

               SECTION 32.3 Wherever in this Lease Landlord's consent or
approval is required, if Landlord shall refuse such consent or approval, Tenant
in no event shall be entitled to make, nor shall Tenant make, any claim, and
Tenant hereby waives any claim, for money damages (nor shall Tenant claim any
money damages by way of set-off, counterclaim or defense) based upon any claim
or assertion by Tenant that Landlord unreasonably withheld or unreasonably
delayed its consent or approval. Tenant's sole remedy shall be an action or
proceeding to enforce any such provision, for specific performance, injunction
or declaratory judgment.



                                      -58-
<PAGE>   59

               SECTION 32.4 (a) All of the Exhibits attached to this Lease are
incorporated in and made a part of this Lease, but, in the event of any
inconsistency between the terms and provisions of this Lease and the terms and
provisions of the Exhibits hereto, the terms and provisions of this Lease shall
control. This Lease may not be changed, modified, terminated or discharged, in
whole or in part, except by a writing, executed by the party against whom
enforcement of the change, modification, termination or discharge is to be
sought. Wherever appropriate in this Lease, personal pronouns shall be deemed to
include the other genders and the singular to include the plural. The captions
hereof are inserted only as a matter of convenience and for reference and in no
way define, limit or describe the scope of this Lease nor the intent of any
provision thereof. All Article and Section references set forth herein shall,
unless the context otherwise specifically requires, be deemed references to the
Articles and Sections of this Lease. Whenever the words "include", "includes",
or "including" are used in this Lease, they shall be deemed to be followed by
the words "without limitation".

               (b) This Lease shall be governed in all respects by the laws of
the State of New York applicable to agreements executed in and to be performed
wholly within said State.

               (c) If any term, covenant, condition or provision of this Lease,
or the application thereof to any person or circumstance, shall ever be held to
be invalid or unenforceable, then in each such event the remainder of this Lease
or the application of such term, covenant, condition or provision to any other
person or any other circumstance (other than those as to which it shall be
invalid or unenforceable) shall not be thereby affected, and each term,
covenant, condition and provision hereof shall remain valid and enforceable to
the fullest extent permitted by law.

               (d) If at the commencement of, or at any time or times during the
Term of this Lease, the Fixed Rent and Additional Rent reserved in this Lease
shall not be fully collectible by reason of any Legal Requirement, Tenant shall
enter into such agreements and take such other steps (without additional expense
to Tenant) as Landlord may request and as may be legally permissible to permit
Landlord to collect the maximum rents which may from time to time during the
continuance of such legal rent restriction be legally permissible (and not in
excess of the amounts reserved therefor under this Lease). Upon the termination
of such legal rent restriction prior to the expiration of the Term, (i) Fixed
Rent and Additional Rent shall become and thereafter be payable hereunder in
accordance with the amounts reserved in this Lease for the periods following
such termination, and (ii) Tenant shall pay to Landlord, if legally permissible,
an amount equal to (A) the items of Fixed Rent and Additional Rent which would
have been paid pursuant to this Lease but for such legal rent restriction less
(B) the rents paid by Tenant to Landlord during the period or periods such legal
rent restriction was in effect.

               (e) The covenants, conditions and agreements contained in this
Lease shall bind and inure to the benefit of Landlord and Tenant and their
respective legal representatives, successors, and, except as otherwise provided
in this Lease, their assigns.

               SECTION 32.5 Except as expressly provided to the contrary in
this Lease, Tenant agrees that all disputes arising, directly or indirectly, out
of or relating to this Lease, and all actions to enforce this Lease, shall be
dealt with and adjudicated in the state courts of New York or the Federal courts
sitting in New York City; and for that purpose hereby expressly and



                                      -59-
<PAGE>   60

irrevocably submits itself to the jurisdiction of such courts. Tenant hereby
irrevocably appoints the Secretary of the State of New York as its authorized
agent upon which process may be served in any such action or proceeding.

                  [Remainder of Page Intentionally Left Blank]





                                      -60-
<PAGE>   61

               IN WITNESS WHEREOF, Landlord and Tenant have respectively
executed this Lease as of the day and year first above written.

                                 111 EIGHTH AVENUE LLC, Landlord

                                 By:     Taconic Investment Partners LLC,
                                         Authorized Signatory



                                 By: ________________________________
                                     Name:
                                     Title:



                                 ABOVENET COMMUNICATIONS, INC., Tenant



                                 By: ________________________________
                                     Name:
                                     Title:


Tenant's Federal Tax Identification Number:

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



<PAGE>   62





                                    EXHIBIT A

                           FLOOR PLANS OF THE PREMISES

The floor plans which follow are intended solely to identify the general outline
of the Premises, and should not be used for any other purpose. All areas,
dimensions and locations are approximate, and any physical conditions indicated
may not exist as shown.




<PAGE>   63

                                    EXHIBIT B

                              RULES AND REGULATIONS

               1. The sidewalks, entrances, passages, courts, elevators,
vestibules, stairways, corridors, or halls shall not be obstructed or encumbered
by any Tenant or used for any purpose other than ingress and egress to and from
the Premises.

               2. No awnings, air-conditioning units, fans or other projections
shall be attached to the outside walls of the Building. No curtains, blinds,
shades, or screens shall be attached to or hung in, or used in connection with,
any exterior window or entry door of the Premises, without the prior written
consent of Landlord. Such awnings, projections, curtains, blinds, shades,
screens or other fixtures must be of a quality, type, design and color, and
attached in the manner approved by Landlord. All electrical fixtures hung in
offices or spaces along the perimeter of the demised premises must be
fluorescent, of a quality, type, design and bulb color approved by Landlord.

               3. No sign, advertisement, notice or other lettering shall be
exhibited, inscribed, painted or affixed by any Tenant on any part of the
Building without the prior written consent of Landlord except that the name of
Tenant may appear on the entrance door of the Premises. In the event of the
violation of the foregoing by Tenant, Landlord may remove same without any
liability, and may charge the expense incurred by such removal to the Tenant or
Tenants violating this rule. Interior signs on doors and directory tablets shall
be inscribed, painted or affixed for each Tenant by Landlord at the expense of
such Tenant, and shall be of a size, color and style acceptable to Landlord.
Landlord will provide directory listings in the directory maintained by Landlord
in the lobby of the Building for Tenant and each partner and professional
employee of Tenant, not to exceed six (6) such listings.

               4. The sashes, sash doors, skylights, windows, and doors that
reflect or admit light and air into the halls, passageways or other public
places in the Building, shall not be covered or obstructed by any Tenant, nor
shall any bottles, parcels, or other articles be placed on the windowsills.

               5. No show cases or other articles shall be put in front of or
affixed to any part of the exterior of the Building, nor placed in the halls,
corridors or vestibules without the prior written consent of Landlord.

               6. The water and wash closets and other plumbing fixtures shall
not be used for any purposes other than those for which they were constructed,
and no sweepings, rubbish, rags, acids or other substances shall be deposited
therein. All damages resulting from any misuse of the fixtures shall be borne by
the Tenant who, or whose servants, employees, agents, visitors or licensees,
shall have caused the same.

               7. No space in the Building shall be used for manufacturing, for
the storage of merchandise, or for the storage of merchandise, or for the sale
of merchandise, goods or property of any kind at auction or otherwise.

               8. No Tenant shall make, or permit to be made, any unseemly or
disturbing noises or disturb or interfere with occupants of this or neighboring
buildings or premises or those having business with them whether by the use of
any musical instrument, radio, television, stereo system, unmusical noise,
whistling, singing, or in any other way. No Tenant shall throw anything out of
the doors, windows or skylights or down the passageways.

               9. No Tenant, or any of Tenant's servants, employees, agents,
visitors or licensees, shall at any time bring or keep upon the Premises any
inflammable, combustible or explosive fluid, chemical or substance.

               10. Each Tenant must, upon the termination of its tenancy, return
to Landlord all keys of stores, offices and toilet rooms, either furnished to,
or otherwise procured by such Tenant, and in the event of the loss of any keys,
so furnished, such Tenant shall pay to Landlord the cost thereof.

               11. All removals, or the carrying in or out of any safes,
freight, furniture or bulky matter of any description must take place in the
manner and during the hours which Landlord or its agent may determine from

<PAGE>   64

time to time. Landlord reserves the right to inspect all safes, freight or other
bulky articles to be brought into the Building and to exclude from the Building
all safes, freight or other bulky articles which violate any of these Rules and
Regulations or the lease of which these Rules and Regulations are a part.
Landlord shall have the exclusive right to prescribe the hours of operation of
the freight elevator and Tenant shall pay, as Additional Rent Landlord's
standard fee for operating the freight elevator after normal hours. No bicycles,
vehicles, animals, birds or fish of any kind shall be brought into or kept by
any Tenant in or about the Premises or the Building.

               12. No Tenant shall occupy or permit any portion of the Premises
demised to it to be occupied as an office for a public stenographer or public
typist, or for the possession, storage, manufacture, or sale of narcotics, dope,
tobacco in any form, or as a barber or manicure shop, or as an employment
bureau. No Tenant shall engage or pay any employees on the Premises, except
those actually working for such Tenant on the Premises, nor advertise for labor
giving an address at the Premises.

               13. No Tenant shall purchase spring water, ice, towels or other
like service from any company or persons not approved by Landlord.

               14. Landlord shall have the right to prohibit any advertising by
any Tenant which, in Landlord's opinion, tends to impair the reputation of the
Building or its desirability as a building for offices, and upon written notice
from Landlord, Tenant shall refrain from or discontinue such advertising.

               15. Landlord reserves the right to exclude from the Building
between the hours of 6 P.M. and 8 A.M. and at all hours on Sundays and legal
holidays all persons who do not present a pass to the Building signed by
Landlord. Landlord will furnish passes to persons for whom any Tenant requests
the same in writing. Each Tenant shall be responsible for all persons for whom
it requests such pass and shall be liable to Landlord for all acts of such
persons.

               16. Each Tenant shall, at its expense, provide artificial light
for the employees of Landlord while doing janitor service or other cleaning, and
in making repairs or alterations in the Premises.

               17. The requirements of Tenants will be attended to only upon
written application at the office of the Building. Employees shall not perform
any work or do anything outside of the regular duties, unless under special
instructions from the office of Landlord.

               18. Canvassing, soliciting and peddling in the Building is
prohibited and each Tenant shall co-operate to prevent the same.

               19. There shall not be used in any space, or in the public halls
of the Building, either by any Tenant or by jobbers or others, in the delivery
or receipt of merchandise, any hand trucks, except those equipped with rubber
tires and side guards.

               20. Tenant shall not do any cooking, conduct any restaurant,
luncheonette or cafeteria for the sale or service of food or beverages to its
employees or to others, or cause or permit any orders of cooking or other
processes or any unusual or objectionable odors to emanate from the demised
premises. Tenant shall not install or permit the installation or use of any
food, beverage, cigarette, cigar or stamp dispensing machine; or permit the
delivery of any food or beverage to the Premises, except by such persons
delivering the same as shall be approved by Landlord.

               21. If there shall be any inconsistencies between the text of
this Lease and these Rules and Regulations, the provisions of the Lease shall
prevail.



<PAGE>   65
                                    EXHIBIT C

                              APPROVED CONTRACTORS


- -------------------------------------------------------------------------------
                            CONSTRUCTION VENDOR LIST
- -------------------------------------------------------------------------------

Mr. Frank Sciame                                  Mr. Al Hot
President                                         President
F.J. SCIAME CONSTRUCTION CO., INC.                FAST TRACK CONSTRUCTION
80 South Street                                   450 West 33rd Street
New York, N.Y. 10038                              New York, N.Y. 10001
Tel:  (212) 232-2200                              Tel:  (212) 279-0110
Fax:  (212) 248-5299                              Fax:  (212) 279-9239

Mr. Anthony Genovese                              Christopher H. Gallin
Executive Vice President                          JOHN GALLIN & SONS, INC.
HRH CONSTRUCTION INTERIORS, INC.                  40 Gold Street
One Park Avenue                                   New York, N.Y. 10018
New York, N.Y. 10016                              Tel:  (212) 267-8624
Tel:  (212) 616-3100                              Fax:  (212) 962-7201
Fax:  (212) 696-4091

Mr. Irving Koven                                  Mr. Peter Dove
AMBASSADOR CONSTRUCTION CO., INC.                 DOMINANT CONSTRUCTION
41 East 42nd Street                               523 Rout 33
New York, N.Y. 10017                              Orangeburg, N.Y. 10962
Tel:  (212) 922-1020                              Tel:  (914) 398-3900
Fax:  (212) 949-9762                              Fax:  (914) 398-3106

Mr. Chris Philips                                 Mr. Stephen S. Thomsen
Vice President                                    THOMSEN CONSTRUCTION CO., INC.
TISHMAN CONSTRUCTION CORP.                        180 Varick Street
666 Fifth Avenue                                  12th Floor
New York, N.Y. 10103                              New York, N.Y. 10014
Tel:  (212) 708-6824                              Tel:  (212) 647-1412
Fax:  (212) 399-3643                              Fax:  (212) 647-1249

LEHER MCGOVERN BOVIS                              Mr. George J. Figliolia
200 Park Avenue                                   NEW YORK CITY BUILDERS GROUP
New York, N.Y. 10166                              One Wall Street, 4th Floor
Tel:  (212) 592-6700                              New York, N.Y. 10005
Fax:  (212) 592-6988                              Tel:  (212) 635-0760
                                                  Fax:  (212) 635-0767


<PAGE>   66

John Berry
WESTSIDE INTERIORS
462 Beattie Road
Rock Tavern, N.Y. 12575
Tel:  (914) 496-8005
Fax:  (914) 496-2912

Alfred J. Tosto
Regional Manager
GNOME GROUP, INC.
111 8th Avenue
New York, N.Y. 10011
Tel:  (212) 807-1991
Fax:  (212) 807-6266



STRUCTURE TONE


Tel:
Fax:
<PAGE>   67

                                    EXHIBIT D

                            FORM OF LETTER OF CREDIT

                          [LETTERHEAD OF ISSUING BANK]

                           LETTER OF CREDIT DEPARTMENT


                         Issue Date: _________ ___, 199_
                          Our Number: ________________


No.________________________________________
Irrevocable Commercial Letter of Credit

                                   APPLICANT:

                                   Beneficiary:   ____________________________

                                   Amount (U.S.): $______________

                                   Expiry: ____________ ___, 19__

Gentlemen:

        For the account of Applicant we hereby establish this Irrevocable Letter
of Credit No. _____________________ in your favor for an amount of up to
$_______________ effective immediately, available by your drafts at sight when
accompanied by this Irrevocable Letter of Credit and the following document:

               Beneficiary's statement purportedly signed by an officer of
               Beneficiary or Beneficiary's authorized managing agent, reading:

                      "The amount of this drawing under Irrevocable Letter of
               Credit No._____________ is being drawn pursuant to Lease dated
               __________________ ____ 199_, by and between
               ______________________, as Landlord, and _________________, as
               Tenant.

        All drafts must be marked "Drawn under ____________________ Bank,
Irrevocable Letter of Credit No. ____________ dated _____________, 19___."

        It is a condition of this Irrevocable Letter of Credit that it shall be
fully transferable by Beneficiary without any fees or charges payable by
Beneficiary in connection therewith.

        It is a condition of this Irrevocable Letter of Credit that it shall be
automatically extended for additional periods of one year from the present or
future expiration date, unless at least 30 days prior to such expiration date we
notify you in writing by certified or registered mail, return receipt requested,
at the above address, that we elect not to renew this Irrevocable Letter of

<PAGE>   68


Credit for such additional period. Upon receipt by you of such notice you may
draw drafts on us at sight for an amount not to exceed the balance remaining in
this Irrevocable Letter of Credit within the then applicable expiry date.

        We hereby agree with you that drafts drawn under and in accordance with
the terms of this Irrevocable Letter of Credit will be duly honored by us on
delivery of this Irrevocable Letter of Credit and the document so specified,
when presented at this office.

        This credit is subject to the Uniform Customs and Practice for
Documentary Credits (1993 Revision), International Chamber of Commerce
Publication No. 500; provided, however, that in the event the expiration date
occurs during an interruption of our business of the type described in Article
17 of such publication, then the expiration date shall be deemed to be
automatically extended until the date which shall be five (5) days after the
resumption of our business.



                                                  ------------------------------
                                                  Authorized Signature



<PAGE>   69


                                    EXHIBIT E

              FORM OF EXISTING MORTGAGEE NON-DISTURBANCE AGREEMENT

             SUBORDINATION, NON-DISTURBANCE AND ATTORNMENT AGREEMENT

        THIS AGREEMENT is made and entered into as of January __, 1999, by and
among LASALLE NATIONAL BANK, AS TRUSTEE FOR GS MORTGAGE SECURITIES CORPORATION
II COMMERCIAL MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1998-GSFL1 ("Lender"),
111 EIGHTH AVENUE LLC ("Landlord"), and ABOVENET COMMUNICATIONS, INC.
("Tenant").

                1.      RECITALS.

                1.1     Mortgage. Lender is the holder of a Promissory Note
dated as of January 14, 1998, in the original principal amount of
$218,000,000.00, of Landlord, which is secured, inter alia, by a Mortgage and
Security Agreement (the "Mortgage") and Assignment of Lease and Rents (the
"Lease Assignment") of even date therewith, covering premises more particularly
described in the Mortgage and in Exhibit A attached hereto and made a part
hereof (the "Premises").

                1.2     Lease. Landlord and Tenant entered into a Lease dated as
of January __, 1999 (the "Lease"), whereby Landlord demised to Tenant a portion
of the Premises (the "Demised Premises").

                2.      CONSIDERATION. The terms of the Lease constitute a
material inducement to Lender's consent thereto and entering into and performing
this Agreement.

                3.      SUBORDINATION OF THE LEASE. The Lease shall be and is
hereby made subject and subordinate to the Mortgage.

                4.      NON-DISTURBANCE. Lender shall not, in the exercise of
any right, remedy, or privilege granted by the Mortgage or the Lease Assignment,
or otherwise available to Lender at law or in equity, disturb Tenant's
possession under the Lease so long as:

                (a)     Tenant is not in default under any provision of the
        Lease or this Agreement at the time Lender exercises any such right,
        remedy or privilege; and

                (b)     The Lease at that time is in force and effect according
        to its original terms, or with such amendments or modifications as
        Lender shall have approved, if such approval is required by the terms of
        the Mortgage or the Lease Assignment; and

                (c)     Tenant thereafter continues to fully and punctually
        perform all of its obligations under the Lease without default
        thereunder beyond any applicable cure period; and

                (d)     Tenant attorns to or at the direction of Lender, as
        provided in Paragraph 5.

<PAGE>   70


Without limiting the foregoing, and so long as the foregoing conditions are met,
Lender agrees that (i) Tenant will not be named as a party to any foreclosure or
other proceeding instituted by Lender to enforce the terms of the Mortgage or
the Lease Assignment; (ii) any sale or other transfer of the Demised Premises or
of Landlord's interest in the Lease, pursuant to foreclosure or any voluntary
conveyance or other proceeding in lieu of foreclosure, will be subject and
subordinate to Tenant's possession under the Lease; and (iii) the Lease will
continue in force and effect according to its original terms, or with such
amendments as Lender shall have approved, if such approval is required by the
terms and conditions of the Mortgage or the Lease Assignment.

                5.      ATTORNMENT. (a) Tenant shall attorn to Lender, to any
receiver or similar official for the Demised Premises appointed at the instance
and request, or with the consent, of Lender and to any person who acquires the
Demised Premises, or the Landlord's interest in the Lease, or both, pursuant to
Lender's exercise of any right, remedy or privilege granted by the Mortgage, or
otherwise at law or in equity. Without limitation, Tenant shall attorn to any
person or entity that acquired the Demised Premises pursuant to foreclosure of
the Mortgage, or by any proceeding or voluntary conveyance in lieu of such
foreclosure, or from Lender, whether by sale, exchange or otherwise. Any
attornment to anyone other than Lender shall be conditioned upon Tenant
receiving a non-disturbance from such entity.

                (b)     Upon any attornment under this Paragraph 5, the Lease
shall continue in full force and effect as a direct lease between Tenant and the
person or entity to whom Tenant attorns, except that such person or entity shall
not be:

                (i)     liable for any breach, act or omission of any prior
        landlord; or

                (ii)    subject to any offsets, claims or defenses which Tenant
        might have against any prior landlord; or

                (iii)   bound by any rent or additional rent or other payment in
        lieu of rent which Tenant might have paid to any prior landlord more
        than 30 days in advance of its due date under the Lease or which such
        person or entity has physical possession of; or

                (iv)    bound by any amendment or modification of the Lease made
        without Lender's written consent, where such consent is required by the
        Mortgage; or

                (v)     bound by any notice given by Tenant to Landlord, whether
        or not such notice is given pursuant to the terms of the Lease, unless a
        copy thereof was then also given to Lender; or

                (vi)    be liable for any security deposit or other sums held by
        any prior landlord, unless actually received.

The person or entity to whom Tenant attorns shall be liable to Tenant under the
Lease only during such person or entity's period of ownership, and such
liability shall not continue or survive as to the transferor after a transfer by
such person or entity of its interest in the Lease and the Demised Premises.

<PAGE>   71


                6.      REPRESENTATIONS AND WARRANTIES.

                6.1     Joint and Several. Landlord and Tenant hereby jointly
and severally represent and warrant to Lender as follows regarding the Lease:

                (a)     A true and correct copy of the Lease (inclusive of all
        riders and exhibits thereto) is attached to the counterpart of this
        Agreement being delivered to Lender. There are no other oral or written
        agreements, understandings or the like between Landlord and Tenant
        relating to the Demised Premises or the Lease transaction.

                (b)     The Lease has not been modified, altered or amended in
        any respect.

                (c)     The addresses for notices to be sent to Tenant and
        Landlord are as set forth in Paragraph 11.

                (d)     To Tenant's knowledge, Tenant has no right of first
        refusal, option or other right to purchase the Premises or any part
        thereof, including, without limitation, the Demised Premises.

                6.2     Several. Landlord and Tenant severally represent and
warrant to Lender with respect to themselves, but not with respect to the other:

                (a)     The execution of the Lease was duly authorized, the
        Lease was properly executed and is in full force and effect and is
        valid, binding and enforceable against Tenant and Landlord and there
        exists no default, nor state of facts which with notice, the passage of
        time, or both, could ripen into a default, on the part of either Tenant
        or Landlord.

                (b)     There has not been filed by or against nor, to the best
        of the knowledge and belief of the representing party, is there
        threatened against or contemplated by, Landlord or Tenant, a petition in
        bankruptcy, voluntary or otherwise, any assignment for the benefit of
        creditors, any petition seeking reorganization or arrangement under the
        bankruptcy laws of the United States or of any state thereof, or any
        other action brought under said bankruptcy laws.

                (c)     There has not been any assignment, hypothecation or
        pledge of the Lease or rents accruing under the Lease, other than
        pursuant to the Mortgage and the Lease Assignment. Tenant makes the
        representation set forth in this subparagraph only to its best knowledge
        and belief.

                7.      RENTS. Landlord and Tenant jointly and severally
acknowledge that the Lease Assignment provides for the direct payment to Lender
of all rents and other monies due and to become due to Landlord under the Lease
upon the occurrence of certain conditions as set forth in the Lease Assignment
without Lender's taking possession of the Demised Premises or otherwise assuming
Landlord's position or any of Landlord's obligations under the Lease. Upon
receipt from Lender of written notice to pay all such rents and other monies to
or at the direction of Lender, Landlord authorizes and directs Tenant thereafter
to make all such payments to or at the direction of Lender, releases Tenant of
any and all liability to Landlord for any and all

<PAGE>   72


payment so made, and shall defend, indemnify and hold Tenant harmless from and
against any and all claims, demands, losses, or liabilities asserted by, through
or under Landlord (except by Lender) for any and all payments so made. Upon
receipt of such notice, Tenant thereafter shall pay all monies then due and
becoming due from Tenant under the Lease to or at the direction of Lender,
notwithstanding any provision of the Lease to the contrary. Tenant agrees that
neither Lender's demanding or receiving any such payments, nor Lender's
exercising any other right, remedy, privilege, power or immunity granted by the
Mortgage or the Lease Assignment, will operate to impose any liability upon
Lender for performance of any obligation of Landlord under the Lease unless and
until Lender elects otherwise in writing. Such payments shall continue until
Lender directs Tenant otherwise in writing.

                Tenant agrees not to pay any rent under the Lease more than 30
days in advance without Lender's consent. The provisions of this Paragraph 7
will apply from time to time throughout the term of the Lease.

                8.      CURE. If Tenant becomes entitled to terminate the Lease
or offset, withhold or abate rents because of any default by Landlord, then
Tenant shall give Lender written notice specifying Landlord's default. Lender
then shall have the right, but not the obligation, to cure the specified default
within the following time periods:

                (a)     Fifteen days after receipt of such notice with respect
        to defaults that can be cured by the payment of money; or

                (b)     Thirty days after receipt of such notice with respect to
        any other default; unless the cure requires Lender to obtain possession
        of the Demised Premises, in which case such thirty day period shall not
        commence until Lender acquires possession, so long as Lender proceeds
        promptly to acquire possession of the Demised Premises with due
        diligence, by foreclosure of the Mortgage or otherwise.

Nothing contained in this Paragraph 8 shall require Lender to commence or
continue any foreclosure or other proceedings, or, if Lender acquires possession
of the Demised Premises, to continue such possession, if all defaults specified
by Tenant in its notice are cured. Possession by a receiver, or other similar
official appointed at the instance, or with the consent, of Lender shall
constitute possession by Lender for all purposes under this Paragraph 8.

                9.      ESTOPPEL LETTERS. Whenever reasonably requested by
Lender, Landlord and Tenant from time to time shall severally execute and
deliver to or at the direction of Lender, and without charge to Lender, one or
more written certifications of all of the matters as set forth in Paragraph 6,
whether Tenant has exercised any renewal option or options and any other
information the Lender may reasonably require to confirm the current status of
the Lease, including, without limitation, a confirmation that the Lease is and
remains subordinated as provided in this Agreement.

                10.     CASUALTY AND EMINENT DOMAIN. Landlord and Tenant jointly
and severally agree that the Mortgage permits Lender, at its option, to apply to
the indebtedness from time to time secured by the Mortgage any and all insurance
proceeds payable with respect to any casualty loss at the Demised Premises and
any and all awards or other compensation that

<PAGE>   73


may be payable for the condemnation of all or any portion of the Demised
Premises, or any interest therein, or by way of negotiated settlement or
conveyance in lieu of condemnation; and Landlord and Tenant jointly and
severally consent to any such application by Lender. Notwithstanding the
foregoing, Landlord and Lender agree that any and all insurance or condemnation
proceeds payable with respect to Tenant's property or the interruption or
relocation of Tenant's business (except for rental loss insurance proceeds) will
be paid to Tenant, so long as they do not reduce the proceeds otherwise payable
to Lender.

                11.     NOTICES. All notices, demands, and other communications
that must or may be given or made in connection with this Agreement must be in
writing and, unless receipt is expressly required, will be deemed delivered or
made 5 days after having been mailed by registered or certified mail, return
receipt requested, or by express mail, in any event with sufficient postage
affixed, and addressed to the parties as follows:

                      To Lender:            c/o AMRESCO Services, L.P.
                                            235 Peachtree Street, N.E.
                                            Suite 900
                                            Atlanta, Georgia 30303
                                            Attn.: Private Sector Servicing

                      To Landlord:          111 Eighth Avenue LLC
                                            c/o Taconic Investment Partners LLC
                                            1500 Broadway
                                            New York, New York 10036
                                            Attention: Mr. Paul Pariser

                      with a copy to:       Schulte Roth & Zabel LLP
                                            900 Third Avenue
                                            New York, New York 10022
                                            Attention: Robert S. Nash, Esq.

                      To Tenant:            AboveNet Communications, Inc.
                                            50 West San Fernando Street
                                            10th Floor
                                            San Jose, California 95113
                                            Attention:  Stephen Belomy

                      with a copy to        McPharlin, Sprinkles & Thomas LLP
                                            Ten Almaden Boulevard
                                            Suite 1460
                                            San Jose, California 95113
                                            Attention: N. Dave Thomas, Esq.



<PAGE>   74



Such addresses may be changed by notice pursuant to this Paragraph 11; but
notice of change of address is effective only upon receipt. Landlord and Tenant
jointly and severally agree that they will furnish Lender with copies of all
notices relating to the Lease. All communications to Lender shall reference
"AMRESCO Loan No.: 400030645."

                12.     SUCCESSORS AND ASSIGNS. As used in this Agreement, the
word "Tenant" shall mean Tenant and any subsequent holder or holders of an
interest under the Lease, as the text may require, provided that the interest of
such holder is acquired in accordance with the terms and provisions of the Lease
and the word "Lender" shall mean Lender or any other subsequent holder or
holders of the Mortgage or any party acquiring title to the Demised Premises by
purchase at a foreclosure sale, by deed of the Lender, or otherwise. Subject to
the foregoing, this Agreement shall bind and inure to the benefit of Landlord,
Tenant and Lender, their legal representatives, successors and assigns. The
terms Lease, Mortgage and Lease Assignment shall include any and all amendments,
modifications, replacements, substitutions, extensions, renewals and supplements
thereto.

                13.     FURTHER ASSURANCES. Landlord and Tenant from time to
time shall execute and deliver at Lender's request all instruments that may be
necessary or appropriate to evidence their agreement hereunder provided such
instrument neither increases Tenant's obligations or decreases its rights under
the Lease.

                14.     COUNTERPARTS. This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original and all such
counterparts shall constitute one and the same instrument.

                15.     SEVERABILITY. A determination that any provision of this
Agreement is unenforceable or invalid shall not affect the enforceability or
validity of any other provision, and any determination that the application of
any provision of this Agreement to any person or to any person or to particular
circumstances is illegal or unenforceable shall not affect the enforceability or
validity of such provision as it may apply to other persons or circumstances.



<PAGE>   75


                IN WITNESS WHEREOF, the parties hereto have executed this
Agreement as of the date first above written.

                                            LENDER:

                                            LASALLE NATIONAL BANK, AS TRUSTEE
                                            FOR GS MORTGAGE SECURITIES
                                            CORPORATION II COMMERCIAL MORTGAGE
                                            PASS-THROUGH CERTIFICATES, SERIES
                                            1998-GSFL1

                                            By: AMRESCO Services, L.P.,
                                                its authorized agent

                                            By: AMRESCO Mortgage Capital, Inc.,
                                                its general partner

                                            By: ____________________________
                                                Name:
                                                Title: Servicing Officer

                                            LANDLORD:

                                            111 EIGHTH AVENUE LLC
                                            By: Taconic Investment Partners LLC,
                                                Authorized Signatory


                                            By: ____________________________
                                                Name:
                                                Title:


                                            TENANT:

                                            ABOVENET COMMUNICATIONS INC.


                                            By: ______________________________
                                            Name:
                                            Title:


<PAGE>   76



STATE OF ________________              )
                                       ) ss.:
COUNTY OF ______________               )

                On this ____ day of ________________, 199__, before me
personally came __________________________ to me known, who, being by me duly
sworn, did depose and say that _he resides at ______________________,
_________________, _______________, that _he is the _______________ of Amresco
Mortgage Capital, Inc., the corporation described in and which executed the
above instrument as a general partner of Amresco Services, L.P., the limited
partnership which executed the foregoing instrument as the authorized agent of
LaSalle National Bank, as Trustee for GS Mortgage Securities Corporation II
Commercial Mortgage Pass-Through Certificates, Series 1998-GSFL1; that _he had
authority to sign the same in such capacity; and that _he executed the same by
order of the board of directors of said corporation as the act and deed of said
partnerships and trust for the uses and purposes therein mentioned.

                                   _________________________________
                                   Notary Public



STATE OF ________________              )
                                       ) ss.:
COUNTY OF ______________               )

                On this ____ day of _______________, 199__, before me personally
came ______ _________________, to me known, who, being by me duly sworn, did
depose and say: that she resides at ________________ __________ _______; that
she is a senior vice president of AboveNet Communications Inc., the corporation
described in and which executed the foregoing instrument; that she had authority
to sign the same in such capacity; and that she executed the same by authority
of the board of directors of said corporation.

                                   _________________________________
                                   Notary Public



<PAGE>   77



STATE OF NEW YORK            )
                             ) ss.:
COUNTY OF NEW YORK           )

                On this ____ day of _______________, 199__, before me personally
came _______________________ to me known, who, being by me duly sworn, did
depose and say that he resides at ______________________, ___________, New York
_____, that he is an Authorized Signatory of Taconic Investment Partners LLC, a
Delaware limited liability company, the limited liability company described in
and which executed the above instrument as a member of 111 Eighth Avenue LLC,
the limited liability company which executed the foregoing instrument; that he
had authority to sign the same in such capacity; and that he executed the same
as the act and deed of said limited liability company for the uses and purposes
therein mentioned.

                                   _________________________________
                                   Notary Public


<PAGE>   78



                                    EXHIBIT A

                                PLOT DESCRIPTION



ALL that certain plot, piece or parcel of land, situate, lying and being in the
Borough of Manhattan, City, County and State of New York, bounded and described
as follows:

BEGINNING at the corner formed by the intersection of the northerly side of West
15th Street and the westerly side of Eighth Avenue;

RUNNING THENCE westerly along the northerly side of West 15th Street, 800 feet
to the easterly side of Ninth Avenue;

THENCE northerly along the easterly side of Ninth Avenue, 206 feet 6 inches to
the southerly side of West 16th Street;

THENCE easterly along the southerly side of West 16th Street, 800 feet to the
westerly side of Eighth Avenue; and

THENCE southerly along the westerly side of Eighth Avenue, 206 feet 6 inches to
the northerly side of West 15th Street, the point of place of BEGINNING.



<PAGE>   79



                                    EXHIBIT F

                                   ALTERATIONS



<PAGE>   80



STATE OF ______________      )
                             ) ss.:
COUNTY OF ____________       )

                On this ____ day of January, 1999, before me personally came
___________, to me known, who, being by me duly sworn, did depose and say: that
__he resides at _____________ ________________________ _______; that __he is the
_________________ of ABOVENET COMMUNICATIONS, INC., the corporation described in
the foregoing instrument; and that __he signed his/her name thereto by order of
the board of directors of said corporation as the act and deed of said
corporation for the uses and purposes therein mentioned.



                                   _________________________________
                                   Notary Public



<PAGE>   81

================================================================================










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


                               AGREEMENT OF LEASE


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


                              111 EIGHTH AVENUE LLC


                                                    LANDLORD


                                       AND


                          ABOVENET COMMUNICATIONS, INC.


                                                     TENANT


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



                           PREMISES:   Portion of Second (2nd) Floor
                                       111 Eighth Avenue
                                       New York, New York 10011

                           DATED:      January ___, 1999





================================================================================

<PAGE>   82



                                TABLE OF CONTENTS



DEFINITIONS....................................................................1

Article 1.   Demise, Premises, Term, Rent......................................4
Article 2.   Use And Occupancy.................................................5
Article 3.   Alterations.......................................................6
Article 4.   Condition of the Premises; Landlord's Work........................9
Article 5.   Repairs; Floor Load..............................................10
Article 6.   Real Estate Taxes and Labor Rate Increases.......................11
Article 7.   Legal Requirements...............................................17
Article 8.   Subordination and Non-Disturbance; Estoppel Certificates.........18
Article 9.   Services ........................................................20
Article 10.   Insurance.......................................................31
Article 11.   Destruction of the Premises; Property Loss or Damage............32
Article 12.   Eminent Domain..................................................34
Article 13.   Assignment and Subletting.......................................34
Article 14.   Access to Premises..............................................42
Article 15.   Certificate of Occupancy........................................43
Article 16.   Default ........................................................44
Article 17.   Remedies and Damages............................................46
Article 18.   Fees and Expenses...............................................48
Article 19.   No Representations By Landlord..................................49
Article 20.   End Of Term.....................................................49
Article 21.   Quiet Enjoyment.................................................50
Article 22.   No Waiver; Non-Liability........................................50
Article 23.   Waiver Of Trial By Jury.........................................51
Article 24.   Inability To Perform............................................51
Article 25.   Bills And Notices...............................................52
Article 26.   Rules And Regulations...........................................52
Article 27.   Broker  ........................................................52
Article 28.   Indemnity.......................................................53
Article 29.   Security Deposit................................................54
Article 30.   Renewal Option..................................................56
Article 31.   [Intentionally Omitted].........................................58
Article 32.   Miscellaneous...................................................58

Exhibit A:.....Floor Plan of the Premises
Exhibit B:.....Rules and Regulations
Exhibit C:.....Approved Contractors
Exhibit D:.....Form of Letter of Credit
Exhibit E:.....Form of Existing Mortgagee Non-Disturbance Agreement
Exhibit F:.....Alterations


<PAGE>   1
                                                                  EXHIBIT 10.36



                             SHAREHOLDERS AGREEMENT



entered into by and between

Raiffeisen Rechenzentrum Ges.m.b.H having its registered offices at 1020 Vienna,
Hollandstrasse 11-13 (hereinafter referred to as "RRZ")

and

AboveNet Communications, Inc.
having its registered office at
50 W. San Fernando Street, #1010, San Jose, CA 95113
(hereinafter referred to as "AboveNet")


(hereinafter collectively also referred to as "Parties")


as follows: 


<PAGE>   2

                                TABLE OF CONTENTS



     I.            FORMATION OF THE COMPANY

     Section 1     Shareholder Structure of the Company
     Section 2     Subscription Right
     Section 3     Non-Equity Contributions

     II.     RELATIONSHIP BETWEEN THE PARTIES

     Section 4     Scope
     Section 5     Articles of Association, By-Laws, Company Business Policy
     Section 6     Transformation to Aktiengesellschaft; Option Pool
     Section 7     Management Board
     Section 8     Shareholders Committee
     Section 9     Right of First Refusal
     Section 10    Put Options
     Section 11    Transfer, Redemption and Encumbrance of Shares
     Section 12    Competition Clause
     Section 13    Inspection of Books
     Section 14    Above Net Stock Option Plan

     III.          General Terms

     Section 15    Term of the Shareholders Agreement
     Section 16    Confidentiality
     Section 17    Costs
     Section 18    General
     Section 19    Applicable Law, Arbitration






<PAGE>   3

                                    EXHIBITS


      Exhibit ./1     RRZ Service Agreement
      Exhibit ./2     License, Connectivity and Marketing Agreement with
                      AboveNet
      Exhibit ./3     Articles of Association of AboveNet Austria GmbH
      Exhibit ./4     By-laws for the Managing Director
      Exhibit ./5     By-Laws for the Shareholders Committee
      Exhibit ./6     List of Affiliates
      Exhibit ./7     Business Plan


                                    PREAMBLE

(1)   RRZ and AboveNet will form AboveNet Communications GmbH (in the following
      referred to as "the Company" or "AboveNet Austria GmbH"), a joint venture
      for the purpose of establishing a co-branded Internet Service Exchange.

(2)   This Shareholders Agreement shall govern the formation of the Company (I.)
      and the relationship between the Parties (II.).

Therefore, it is agreed as follows:


                           I. FORMATION OF THE COMPANY

                                   SECTION 1
                      SHAREHOLDER STRUCTURE OF THE COMPANY

(1)   ESTABLISHMENT OF THE COMPANY: RRZ and AboveNet shall establish AboveNet
      Communications GmbH with a nominal share capital of [*] that will be fully
      paid in cash by all Parties upon formation of the Company. Each Party will
      hold a 50% share [*] in the Company.

(2)   PARTICIPATION AND OWNERSHIP STRUCTURE: The Parties have informed each
      other of their current group structure and the intended structure of their
      respective shareholding in the



*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>   4

      Company and undertake to keep each other informed in writing of any future
      ownership changes thereof at all times.

                                    SECTION 2
                               SUBSCRIPTION RIGHT

(1)   SUBSCRIPTION RIGHT: The Parties shall have the right (but not an
      obligation) to participate in any increase of the Company's share capital
      and/or other future financing, if any, in proportion to their respective
      shareholding in order to maintain their original ownership rights,
      respectively (hereinafter referred to as "Subscription Right").

(2)   WAIVER OF SUBSCRIPTION RIGHT: If a Party fails to participate in any
      particular capital increase, it waives its subscription right with respect
      to that capital increase irrevocably and without consideration for the
      benefit of the other Party.


                                    SECTION 3
                            NON-EQUITY CONTRIBUTIONS

CONTRIBUTIONS: In addition to the equity contributions described in Clause 1
para 1 hereunder, the Parties will provide the following non-equity
contributions to the Company:

      (a) RRZ:

          RRZ will make the non-equity contributions and provide the services
          specified in and in accordance with the provisions of the RRZ Service
          Agreement (Exhibit ./1).

      (b) AboveNet:

          AboveNet will provide to the Company a license in the form of the
          License, Connectivity and Marketing Agreement (hereinafter "Licence
          Agreement") attached hereto as Exhibit ./2.

        The License Agreement will inter alia provide for termination clauses;
the Company's rights under the License Agreement shall inter alia terminate (i)
in the case of termination of this Agreement by AboveNet other than for cause,
effective 12 (twelve) months after the termination date or (ii) in the case of
termination of this Agreement by RRZ or termination of this Agreement by
AboveNet for cause, within 60 (sixty) days following termination. In each case
the Company shall pay royalties pursuant to License Agreement from the day the


<PAGE>   5



termination notice is received until the effective date of termination. The
Licence Agreement will furthermore provide for termination clauses for the event
that a competitor of AboveNet acquires influence on RRZ or any of its Affiliates
directly or indirectly. The Company's rights under the RRZ Service Agreement
(Exhibit ./1) shall terminate (i) in the case of termination by RRZ, effective
12 (twelve) months after the termination date within one year or (ii) in the
case of termination by AboveNet within 60 (sixty) days following termination. In
each case the Company shall have the right to use the facility under the same
terms and conditions as applicable immediately prior to such termination once
termination is declared from the day the termination notice is received until
the effective date of termination.


                      II. RELATIONSHIP BETWEEN THE PARTIES

                                    SECTION 4
                                      SCOPE

Part II of this Shareholder Agreement shall become effective as soon as the
notarial deed establishing AboveNet Austria GmbH is duly executed by the Parties
or their duly empowered representatives.

                                    SECTION 5
            ARTICLES OF ASSOCIATION, BY-LAWS, COMPANY BUSINESS POLICY

(1)   ARTICLES OF ASSOCIATION: The Company shall have Articles of Association in
      accordance with Exhibit ./3. The shareholder meeting shall issue by-laws
      for the Managing Director in accordance with Exhibit ./4 and for the
      Shareholders Committee in accordance with Exhibit ./5.

(2)   ARM'S LENGTH TRANSACTIONS: All of the Company's transactions, in
      particular with companies that are affiliated with or related to the
      parties AboveNet and RRZ must be made at arm's length. The Company will
      also solicit and conclude transactions with companies that are not related
      to AboveNet and RRZ.

(3)   AFFILIATES: The term affiliated company shall be defined as any Company or
      person which is controlled by, controls or is under common control with
      the entities of AboveNet or RRZ (hereinafter referred to as "Affiliate").
      A list of current AboveNet and RRZ Affiliates is attached hereto as
      Exhibit ./6. Exhibit ./6 will be updated at least quarterly and a copy
      thereof provided to the other Party, respectively without delay.


<PAGE>   6


                                    SECTION 6
                TRANSFORMATION TO AKTIENGESELLSCHAFT; OPTION POOL

(1)   AboveNet shall have the right to request the transformation of the Company
      from a Gesellschaft mit beschrankter Haftung (GmbH) into an
      Aktiengesellschaft (AG) at any time after 24 months after the registration
      of the Company in the Commercial Register. Upon receipt of such request
      the Parties shall take all necessary - corporate - measures to execute the
      transformation, including but not limited to shareholders' resolutions,
      adaptation of corporate agreements like the Articles of Association and
      this Shareholders Agreement.

(2)   After the transformation of the Gesellschaft mit beschrankter Haftung
      (GmbH) to an Aktiengesellschaft (AG), an Option Pool (which will not be
      less than 5% or more than 10% of the total equity based upon the initial
      valuation) will be reserved for future issuances of options to employees.
      The number of shares reserved under the Option Pool may not be increased
      until the Company's initial public offering unless such increase is
      unanimously approved by the Shareholders Committee. Options will be
      granted at fair market value on date of grant, which cannot be before the
      date of employment.

(3)   At the time AboveNet exercises its right to request the transformation to
      an AG, the terms and conditions of a future IPO shall be discussed.
      Provided the Parties agree to such stock exchange listing, the Parties
      shall undertake to cooperate in the preparation and completion of an
      initial public offering as necessary, such as cooperate in the
      preparation and disclosure of information; disclosure of relevant
      provisions of this agreement; the disclosure of key data and analyses and
      other relevant information as necessary; the timing of the public
      offering; and a coordination of time frames and procedures among the
      Parties.

      In the event of an IPO, Parties shall also discuss in good faith
      appropriate amendments to the Articles of Association and this Agreement
      to conform with the requirements for a Company with public shareholders.

                                    SECTION 7
                                MANAGEMENT BOARD

(1)   APPOINTMENT RIGHT: The Company's Management shall consist of one Managing
      Director, who shall be appointed for an initial term of two years;
      appointments for


<PAGE>   7


      consecutive terms of up to three years are possible. Moreover, each of the
      Parties may request premature termination/recall of the Managing Director
      due to failure by the Managing Director to achieve annual business targets
      set forth in the business plan agreed to by the parties in connection with
      the formation of the Company, for the first three business years and later
      from time to time, at least three months before the end of a business year
      for the following business year.

(2)   REPORTING: The Managing Director shall submit (i) to the Shareholders
      Committee and (ii) to AboveNet and RRZ respectively, monthly, quarterly
      and annual written financial statements and reports on the business
      development of the Company and the status in achieving monthly, quarterly
      and annual business targets, respectively in a format and on recurring due
      dates notified to the Managing Director by the Shareholders Committee from
      time to time. Such (financial) statements and reports will inter alia be
      integrated into the consolidated reports of the Parties to the
      authorities, including in the case of AboveNet, the SEC. Therefore
      AboveNet and RRZ shall inter alia receive (i) quarterly financial
      statements done in accordance with US GAAP within 15 days after quarters
      end and (ii) audited annual financial statements within 30 days after year
      end in accordance with US GAAP.


                                    SECTION 8
                             SHAREHOLDERS COMMITTEE

(1)   ESTABLISHMENT: The Company has a Shareholders Committee, established
      pursuant to Clause 8 hereof.

(2)   COMPOSITION: The Shareholders Committee shall consist of five members,
      four of which are nominated by the Parties pursuant to Clause 8.3 hereof
      and elected by the Shareholders Meeting pursuant to Clause 8.4, and one of
      which is elected by the Shareholders Meeting. After the transformation
      into an AG, the Shareholders Committee shall consist of seven members,
      four of which are nominated by the Parties pursuant to Clause 8.3 hereof
      and elected by the Shareholders Meeting pursuant to Clause 8.4, and three
      of which are elected by the Shareholders Meeting.

 (3)  NOMINATION: The Parties agree that AboveNet shall have the right to
      nominate two members, and RRZ shall have the right to nominate two members
      of the Shareholders Committee. The Parties shall exercise this right
      pursuant to Clause 8.6 hereof.



<PAGE>   8


(4)   ELECTION: The Shareholders Meeting elects the members of the Shareholders
      Committee. Each Party shall vote for the election of candidates nominated
      pursuant to Clause 8.3 hereof. The members of the Shareholders Committee
      nominated pursuant to Clause 8.3 shall be elected by three quarters of the
      votes cast. The other members shall be elected by unanimous vote.

(5)   REPLACEMENT AND REMOVAL: If one Party should wish to replace a member of
      the Shareholders Committee nominated by it, then the other Party shall
      vote for the removal of such member and the election of the new member to
      be nominated by the Party that nominated the removed member, regardless of
      whether the removal is for or without cause. Each Party may also remove
      members of the Shareholders Committee nominated by it without immediately
      replacing them. If the Chairman is removed as Shareholders Committee
      member, such person shall be replaced immediately.

(6)   NOMINATION AND REMOVAL NOTICES: The nomination and removal rights pursuant
      to this Clause shall be exercised by notice to the other Party, sent by
      registered mail with a notice period of four weeks before the Shareholders
      Meeting, in which such appointment or removal is to be resolved. The
      Company shall be timely notified to ensure that the agenda can be set
      accordingly.

(7)   TERM: Election shall be for two year periods. Shareholders Committee
      members may be re-elected. If a member of the Shareholders Committee
      resigns from the Shareholders Committee prior to the expiry of the term
      and should an election take place to replace this member, the term of the
      newly elected Shareholders Committee member shall coincide with the expiry
      of term of the Shareholders Committee member who has prematurely resigned.

(8)   MATTERS TO BE DECIDED BY SHAREHOLDERS COMMITTEE: The Shareholders
      Committee shall pass resolutions on all matters to be decided by
      shareholders resolution or voted on by the Shareholders Meeting or
      provided for in the by-laws for the Managing Director from time to time
      and any other matters set forth in this Agreement.

(9)   MATTERS REQUIRING SHAREHOLDERS COMMITTEE'S APPROVAL: The following
      management measures and matters to be resolved by Shareholders
      Resolution/Shareholders Meeting shall require the approval of the
      Shareholders Committee:

      1.  any merger or acquisition transaction;

      2.  any sale, transfer, pledge or other disposition of any assets of the
          Company;



<PAGE>   9

      3.  after transformation into an AG: redemption or repurchase of any
          outstanding shares of the Company;

      4.  entering into any transaction, agreement, or arrangement (or modify
          any existing arrangement) with any shareholder of the Company, except
          for ordinary course of business transactions between the affiliates of
          the shareholders which have a value of less than USD 20,000 (twenty
          thousand), and except for transactions under the Service and License
          Agreements;

      5.  making any Capital expenditures other than approved as part of the
          Business Plan attached hereto;

      6.  in case of transformation into an AG: issuing any stock or other
          securities with rights equal to or senior to AboveNet's and/or the
          Parties' securities, other than in a public offering which (i) raises
          at least USD 10,000,000 (Dollars ten million) for the Company at a
          pre-money valuation of at least USD 60,000,000 (Dollars sixty million)
          if such offering is on an Austrian exchange or EASDAQ or (ii) raises
          at least USD 20,000,000 (Dollars twenty million) for the Company at a
          pre-money valuation of at least USD 125,000,000 (Dollars one hundred
          twenty five million) if the offering is on the NASDAQ National Market;

      7.  entering into any compensation arrangements with senior management; 8.
          settling any claims or litigation (other than monetary settlements
          under USD 5,000);

      9.  incurring or guaranteeing debt;

      10. after transformation into an AG: issuing more than an agreed upon
          number of options to employees;

      11. paying dividends or making other distributions to shareholders;

      12. amending any of Company's Articles of Association; 

      13. appointing and recalling a managing director or making any material
          change in the management or the nature of the business of the Company;

      14. modifying the 4-year Business Plan, including any changes in the
          pricing that would negatively affect the average price per megabit of
          bandwidth;

      15. deciding on arbitration experts;

      16. selection and appointment of auditors, which shall be from among the
          leading international accountancy firms;

      17. after transformation into an AG: deciding on terms for the initial
          public offering of the Company's shares

      18. the transformation of the Gesellschaft mit beschrankter Haftung (GmbH)
          into an Aktiengesellschaft (AG);

      19. after transformation into an AG: the increase of the number of shares
          reserved under the Option Pool before the Company's initial public
          offering pursuant to Clause 6.2 hereof;



<PAGE>   10


      20. consenting to the pledge or other encumbrance of shares in the
          Company.

(10)  MAJORITY REQUIREMENTS AND PARTIES VETO RIGHT. Resolutions of the
      Shareholders Committee are (in principle) adopted by four fifths of the
      votes cast, if the Shareholders Committee has five members. After an
      increase of the number of Shareholders Committee members to seven members,
      resolutions are adopted by five sevenths of the votes cast. In the case of
      written vote pursuant to Clause 8.15 hereof, the members of the
      Shareholders Committee shall notify the Company as to whether they will
      vote in favor of or against any item on the agenda within ten business
      days after receipt of a written summary of all of the material terms of
      the proposed action. If a member of the Shareholders Committee votes
      against the resolution of a proposed action, the issue shall be subject to
      an additional voting. In case of Clause 8.9.16 AboveNet shall have the
      right to nominate the auditor; the other Parties shall consent to such
      auditor and may exercise their veto right only if the nominated auditor
      (i) is not affiliated with AboveNet's US auditors and/or (ii) is not from
      among the leading international accountancy firms. The auditor for the
      first business year shall be Deloitte & Touche Vienna. In case of Clause
      8.9.14, resolutions are adapted unanimously. RRZ shall have the right to
      request revisions of the Business Plan if market conditions have
      materially changed, or if the growth rate of the market is materially
      different to the anticipated growth rate of the market. Such request may
      be made no more than once in a business year for the following business
      year. In this case AboveNet agrees to negotiate in good faith revisions to
      the targets set forth in the business plan for a particular business year
      and to vote to approve such negotiated revisions.

(11)  INFLUENCE ON CORPORATE BODIES OF THE COMPANY: The Parties agree that they
      will (i) instruct the Shareholders' representatives and their proxies to
      exercise their voting rights in Shareholders Resolutions/Shareholders
      Meetings pursuant to the resolutions of the Shareholders Committee and
      (ii) exercise their influence on the Managing Director of the Company that
      the business of the Company be conducted pursuant to the resolutions of
      the Shareholders Committee. In case shareholders' representatives and
      their proxies do not exercise their voting rights in shareholders
      resolutions/shareholders' meetings in accordance with the resolutions of
      the Shareholders Committee, shareholders resolutions passed contrary to
      resolutions of the Shareholders Committee shall be reversed in
      resolutions/shareholders' meeting to be passed/called as soon as possible.

(12)  QUORUM: The Shareholders Committee constitutes a quorum if four
      Shareholders Committee members are present in the case of a Shareholders
      Committee constituted with five members, and if six members are present in
      the case of a Shareholders 
<PAGE>   11
      Committee constituted with seven members. Members of Shareholders
      Committee may issue written voting proxies (fax sufficient) to other
      Members.

(13)  CALLING OF MEETINGS: The Shareholders Committee meetings shall be convened
      by the Chairman, which Chairman shall be one of the AboveNet appointees to
      the Shareholders Committee, to be determined by AboveNet, or, failing him,
      by any other member of the Shareholders Committee to the address last made
      known. The minimum advance notice shall be 30 (thirty) business days. A
      meeting may be called by registered letter, telegram, telefax, or via
      electronic means.

(14)  MINUTES: The Chairman of the Shareholders Committee shall procure that
      minutes of the Shareholders Committee shall be taken, in which at least
      the agenda, the members present and the result of any voting shall be
      reflected. Such minutes shall be signed by the Chairman of the
      Shareholders Committee and shall be made available to the Parties without
      undue delay.

(15)  WRITTEN RESOLUTIONS: Unless one of the Parties objects in writing to this
      manner of passing the resolution within one week from receipt of a
      proposed resolution, all resolutions of the Shareholders Committee may be
      adopted by written consent. The Chairman of the Shareholders Committee
      shall coordinate the voting by written consent and shall provide the
      Members of the Shareholders Committee with the result of the written vote
      without undue delay.

(16)  REMUNERATION FOR EXTERNAL SHAREHOLDER COMMITTEE MEMBERS: Members of the
      Shareholders Committee nominated by the Shareholders pursuant to Clause
      8.3 hereof shall have no claim to remuneration or reimbursement for
      expenses for Shareholder Committee meetings. External members of the
      Shareholders Committee shall be entitled to reimbursement of expenses and
      an attendance fee to be determined by the Shareholders' Meeting from time
      to time.

                                    SECTION 9
                             RIGHT OF FIRST REFUSAL

(1)   RIGHT OF FIRST REFUSAL: All current and future (see Clause 18.2)
      shareholders in the Company grant the Parties a right of first refusal and
      subscription right (hereinafter referred to as the "Right of First
      Refusal") to the shares in the Company.



<PAGE>   12


(2)   CASE OF RIGHT OF FIRST REFUSAL: If one or more of the shareholders intend
      to sell his (their) share(s) in the Company or parts thereof (hereinafter
      referred to as the "Share" or the "Shares") to third parties against
      payment or gratuitously or sell them in another manner or assign them to
      third party(ies) against payment or gratuitously (e.g. by way of in-kind
      contribution), the other shareholders shall be entitled to of a Right of
      First Refusal with respect to such Shares. The shareholder proposing the
      sale shall immediately offer the Shares to the (other) Party(ies) in
      proportion to their respective shareholdings for exercise of the Right of
      First Refusal. Transfers by the shareholders to Affiliates (other than a
      third party that acquirers AboveNet) shall be subject to the other
      Parties' consent, which shall not be unreasonably withheld, and shall, in
      the case of consent, not constitute transfer to third parties.

(3)   PRESENTATION OF OFFER: If a shareholder proposes a transfer that is
      subject to the Right of First Refusal , the shareholder(s) proposing to
      sell its (their) share(s) shall be obligated to present to the other
      Party(ies) the purchase or sale offer, alienation or acquisition offer or
      the corresponding legal transaction concluded as condition precedent by
      transmitting a certified copy of the document which must contain the
      entire conditions of the legal transaction (in particular however not
      limited to the identity of the proposed acquirer, the nominal value of the
      share(s) to be transferred, remuneration and conditions of payment).

(4)   EXERCISE OF RIGHT OF FIRST REFUSAL: The Party(ies) have the right to
      exercise the Right of First Refusal within a deadline of 20 (twenty)
      business days as of notification pursuant to para 3 by offering to take
      over the share(s) to be transferred at the same price and on substantially
      the same terms (other than the form of consideration) as offered by the
      proposed acquiror.

(5)   CASH OR MARKETABLE SECURITIES CONSIDERATION: If the proposed acquiror has
      offered cash consideration or marketable securities, the Parties shall
      have the right to pay as consideration cash, or in the case of AboveNet,
      cash and/or AboveNet stock valued at the current stock market rate
      (valuation) or a combination of cash and stock, at its own election. The
      shareholders shall not be entitled to transfer their shares for any
      consideration other than cash or marketable securities without the
      unanimous consent of the other shareholders.

      In the event that AboveNet chooses stock as the form of consideration, the
      stock shall, at the sole option of AboveNet, be either (i) tradable on
      NASDAQ at the time of the closing of the acquisition or (ii) AboveNet
      shall agree to use its all reasonable efforts to register the shares with
      the U.S. Securities and Exchange Commission (the "SEC") for resale


<PAGE>   13


      within 90 (ninety) days of the closing, subject to AboveNet's right to
      extend such 90 (ninety) day period if it has material non-public
      information, the disclosure of which would have an adverse effect on
      AboveNet or its stockholders. If the shares are registered prior to the
      closing, the number of shares to be issued shall be determined by dividing
      the valuation of the Company by the value of one AboveNet share (based
      upon the average closing price of AboveNet stock over the ten trading days
      ending three trading days prior to the closing). If the closing price of
      the AboveNet stock on the day prior to the day it becomes tradable on
      NASDAQ is less than the value of one share of AboveNet stock (based upon
      the average closing price of the AboveNet stock over the ten trading days
      ending three trading days prior to the closing), AboveNet will provide the
      shareholders at AboveNet's option, cash or additional shares AboveNet
      stock with a value sufficient to compensate them for such decrease.

(6)   Registration of Shares:

      (a)   Registration of Shares. If the shares of AboveNet common stock (the
            "Common Shares") are not registered with the U.S. Securities and
            Exchange Commission (the "SEC") prior to the Closing, AboveNet
            shall, within 30 days after the Closing Date, file with the SEC a
            registration statement under the Securities Act covering the resale
            to the public by the shareholders of the Common Shares (the
            "Registration Statement"). AboveNet shall use reasonable efforts to
            cause the Registration Statement to be declared effective by the SEC
            as soon as practicable. AboveNet shall use its reasonable efforts,
            subject to subsection (b) below, to cause the Registration Statement
            to remain effective for until the earlier of (i) 120 days from the
            effective date of the Registration Statement (the "Selling Period")
            or (ii) such time as all of the Common Shares covered by the
            Registration Statement have been sold pursuant thereto.

      (b)   Limitations on Registration Rights.

            (i)   AboveNet may, at any time, delay the filing or effectiveness
                  of the Registration Statement or suspend the Registration
                  Statement after effectiveness and may further, by written
                  notice to the shareholders, require that shareholders
                  immediately cease sales of the Common Shares during the
                  Selling Period in the event that, and for so long as, AboveNet
                  determines that the existence of any fact or the happening of
                  any event (including without limitation pending negotiations
                  relating to, or the consummation of, a transaction or the
                  occurrence of any other event) would require additional


<PAGE>   14



                  disclosure of material information by AboveNet in the
                  Registration Statement the confidentiality of which AboveNet
                  has a business purpose to preserve or which fact or event
                  would render AboveNet unable to comply with SEC requirements
                  (in either case, a "Suspension Event").

            (ii)  If AboveNet delays or suspends the Registration Statement or
                  requires Investor to cease sales of shares pursuant to Section
                  b.i above, AboveNet shall, as promptly as practicable
                  following the termination of the circumstance which entitled
                  AboveNet to do so, take such actions as may be necessary to
                  file or reinstate the effectiveness of the Registration
                  Statement and/or give written notice to Investor authorizing
                  Investor to resume sales pursuant to the Registration
                  Statement. If as a result thereof the prospectus included in
                  the Registration Statement has been amended to comply with the
                  requirements of the Securities Act, AboveNet shall enclose
                  such revised prospectus with the notice to shareholder given
                  pursuant to this Section b.ii, and shareholders shall make no
                  offers or sales of shares pursuant to the Registration
                  Statement other than by means of such revised prospectus.

            (iii) In the case of any Suspension Event occurring prior to and
                  delaying the filing of the Registration Statement, AboveNet
                  shall file the Registration Statement in accordance with
                  Section b.ii above and shall be required to keep the
                  Registration Statement effective until the earlier of (i) such
                  time as all of the shares offered thereby have been disposed
                  of in accordance with the intended methods of distribution set
                  forth in the Registration Statement or (ii) 120 days plus an
                  extended period equal to the number of days during which any
                  such suspension was in effect.

      (c)   Registration Procedures.

            (i)   In connection with the filing by AboveNet of the Registration
                  Statement, AboveNet shall furnish to the shareholders copies
                  of the prospectus, including a preliminary prospectus, in
                  conformity with the requirements of the Securities Act and
                  such additional copies as are reasonably requested by the
                  shareholders.

            (ii)  AboveNet shall use its best efforts to register or qualify the
                  Common Shares covered by the Registration Statement under the
                  securities laws of such states as the shareholders shall
                  reasonably request; provided, however, that AboveNet shall not
                  be required in connection with this Section c.ii to


<PAGE>   15

                  qualify as a foreign corporation or execute a general consent
                  to service of process in any jurisdiction.

            (iii) If AboveNet has delivered final prospectuses to the
                  shareholders and after having done so the prospectus is
                  amended to comply with the requirements of the US Securities
                  Act of 1933, as amended, AboveNet shall promptly notify the
                  shareholders and, if requested by AboveNet, the shareholders
                  shall immediately cease making offers or sales of shares under
                  the Registration Statement and return all prospectuses to
                  AboveNet. AboveNet shall promptly provide the shareholders
                  with revised prospectuses and, following receipt of the
                  revised prospectuses, the shareholders shall be free to resume
                  making offers and sales under the Registration Statement.

            (iv)  AboveNet shall pay the expenses incurred by it in complying
                  with its obligations under this Section -, including all
                  registration and filing fees, exchange listing fees, fees and
                  expenses of counsel for AboveNet, and fees and expenses of
                  accountants for AboveNet, but excluding (i) any brokerage
                  fees, selling commissions or underwriting discounts incurred
                  by Investor in connection with sales under the Registration
                  Statement and (ii) the fees and expenses of any counsel
                  retained by the shareholders.

      (d)   Requirements of Shareholders. AboveNet shall not be required to
            include any Common Shares in the Registration Statement unless each
            shareholder furnishes to AboveNet in writing such information
            regarding the shareholder and the proposed sale of Common Shares by
            the shareholder as AboveNet may reasonably request in writing in
            connection with the Registration Statement or as shall be required
            in connection therewith by the SEC or any state securities law
            authorities.

(7)   DUE DATE OF REMUNERATION: The remuneration shall be due within 30 (thirty)
      days following the conclusion of the proceeding pursuant to para 2 through
      4, the remuneration pursuant to para 5 shall be due within 30 (thirty)
      days as of determination of the remuneration under subpara 5 hereof. In
      case of default in payment, default interests in the amount of 4 (four)
      percent over the discount rate (Basiszinssatz) as fixed by decree from
      time to time shall be paid.

(8)   NON-EXERCISE OF RIGHT OF FIRST REFUSAL: If the Party(ies) choose(s) not to
      exercise the Right of First Refusal in a particular case, the
      shareholder(s) obligated to the preemptive sale may sell, alienate, or
      transfer the Shares as to which the right of first refusal


<PAGE>   16


      within 6 (six) months following notification of the Right of First
      Refusal, however - in case of a sale or a transfer to a third party - only
      to the disclosed third party and in all cases of Right of First Refusals
      only subject to the provisions and conditions exactly as disclosed
      pursuant to para 3. If the shareholder(s) obligated to the preemptive sale
      does not alienate or transfer the Shares subject to the Right of First
      Refusal within this deadline, the Right of First Refusal shall cease to
      exist for the case in question yet shall in general continue to exist.

(9)   STATEMENTS AND NOTIFICATIONS: All statements and notifications according
      to the above provisions shall be made by certified airmail letter or
      courier mail or personally delivered. Unless expressly provided otherwise,
      all of the deadlines mentioned in the above provisions shall be counted as
      of five business days after dispatch (date of the postal stamp).

                                   SECTION 10
                                   PUT OPTIONS

(1)   PUT OPTION 1: RRZ hereby irrevocably offers to buy and accept from
      AboveNet the shares in the Company ("Put Option 1"). This option may only
      be exercised with respect to all shares, and may not be exercised
      partially.

(2)   EXERCISE OF PUT OPTION: Put Option 1 may be exercised by AboveNet (i) if,
      without AboveNet's prior written approval, nominal capital of the Company
      is sold by RRZ to a third party or parties in a single transaction or a
      series of related transactions, and such third party(ies) does (do) not
      offer to purchase all of AboveNet's shares in the Company on the same
      terms as shares are being purchased from other shareholders or (ii) a
      direct or indirect competitor of Above Net acquires direct or indirect
      ownership of RRZ. In case of (i) AboveNet may demand as its purchase price
      the higher of the price per share being offered by the third party and the
      remuneration determined under Clause 10 subpara 3 below and in case of
      (ii) the remuneration shall be determined under Clause 10 subpara 3 below.
      AboveNet shall exercise its Put Option within 20 (twenty) business days
      after written notification by RRZ or the Company, respectively, from the
      closing of the transaction or transactions.

(3)   DETERMINATION OF REMUNERATION: If no agreement on the amount of
      consideration for the Shares can be reached within 14 (fourteen) days
      following the Effective Date, the price shall be the fair market value as
      determined by a certified Austrian auditing and tax consultancy company or
      by a certified Austrian auditor and tax consultant mutually


<PAGE>   17


      agreed upon by AboveNet and RRZ (hereinafter referred to as "the
      Arbitration Expert"). If AboveNet and RRZ cannot agree to an arbitration
      expert within 14 (fourteen) days, each shall select an expert and have the
      price evaluated. If the two evaluations are more than 20 (twenty) % apart,
      an Arbitration Expert shall be appointed upon application by one of the
      shareholders by the President of the Vienna Chamber of Certified
      Accountants. The arbitration opinion by this expert shall be binding upon
      the respective Parties. The costs for the Arbitration Expert shall be
      borne by both Parties, whereby AboveNet shall pay one half, and RRZ the
      other half.

(4)   DECLARATION OF ACCEPTANCE: The declaration of acceptance of the offer
      under the Put Option shall be timely and properly made provided AboveNet
      exercises the Put Option and thereby accepts the offer hereunder in the
      form of a the written, duly signed acceptance declaration to RRZ. The sale
      and assignment of the Shares shall be deemed concluded upon service of an
      original copy of the Notarial Acceptance Deed to RRZ.

(5)   EFFECTIVE DATE: The effective date for the sale and transfer shall be the
      day on which the respective written acceptance declarations are delivered
      to RRZ (hereinafter referred to as "Effective Date").

(6)   PAYMENT DUE DATE: Purchase Price shall be due and payable to AboveNet
      within thirty (30) business days from (i) the Effective Date and (ii) in
      case of Art 10.3 the service of the arbitrator's opinion (10.3),
      respectively.

(7)   PUT OPTION 2: AboveNet hereby irrevocably offers to buy and accept from
      RRZ the shares in the Company ("Put Option 2"). This option may only be
      exercised with respect to all shares, and may not be exercised partially

(8)   EXERCISE OF PUT OPTION 2: Put Option 2 may be exercised by RRZ if, without
      RRZ's prior written approval, nominal capital of the Company is sold by
      AboveNet to a third party or parties in a single transaction or a series
      of related transactions, and such third party(ies) does (do) not offer to
      purchase all of RRZ's shares in the Company on the same terms as shares
      are being purchased from other shareholders. In such case RRZ may demand
      as the purchase price for their shares the higher of the the price per
      share being offered by the third party and the remuneration shall be
      determined under Clause 10 subpara 9 below. RRZ shall exercise its Put
      Option within 20 (twenty) business days after written notification by
      AboveNet or the Company, respectively, from the closing of the transaction
      or transactions.



<PAGE>   18


(9)   DETERMINATION OF REMUNERATION: If no agreement on the amount of
      consideration for the Shares can be reached within 4 (four) weeks
      following receipt of the termination notice by the remaining
      shareholder(s), the fair market value of the shares shall be determined by
      a certified Austrian auditing and tax consultancy company or by a
      certified Austrian auditor and tax consultant mutually agreed upon by
      AboveNet and RRZ (hereinafter referred to as "the Arbitration Expert"). If
      AboveNet and RRZ cannot agree to an arbitration expert within 14
      (fourteen) days, each shall select an expert and have the price evaluated.
      If the two evaluations are more than 20 (twenty) % apart, an Arbitration
      Expert shall be appointed upon application by one of the shareholders by
      the President of the Vienna Chamber of Certified Accountants. The
      arbitration opinion by this expert shall be binding upon the respective
      Parties. The costs for the Arbitration Expert shall be shared by the
      Parties, whereby AboveNet shall pay 50% and RRZ shall pay 50%.

(10)  DECLARATION OF ACCEPTANCE: The declaration of acceptance of the offer
      under the Put Option shall be timely and properly made provided RRZ
      exercises the Put Option and thereby accepts the offer hereunder in the
      form of a the written, duly signed acceptance declaration to AboveNet. The
      sale and assignment of the Shares shall be deemed concluded upon service
      of an original copy of the Notarial Acceptance Deed to AboveNet.

(11)  EFFECTIVE DATE: The effective date for the sale and transfer shall be the
      day on which the respective written acceptance declarations are delivered
      to AboveNet (hereinafter referred to as "Effective Date").

(12)  FORM OF CONSIDERATION. AboveNet shall be entitled to pay the Purchase
      Price in either cash or shares of AboveNet stock. In the event that
      AboveNet chooses stock as the form of consideration, the stock shall, at
      the sole option of AboveNet, be either (i) tradable on NASDAQ at the time
      of the closing of the acquisition or (ii) AboveNet shall agree to use its
      all reasonable efforts to register the shares with the U.S. Securities and
      Exchange Commission (the "SEC") for resale within 90 (ninety) days of the
      closing, subject to AboveNet's right to extend such 90 (ninety) day period
      if it has material non-public information, the disclosure of which would
      have an adverse effect on AboveNet or its stockholders. If the shares are
      registered prior to the closing, the number of shares to be issued shall
      be determined by dividing the valuation of the Company by the value of one
      AboveNet share (based upon the average closing price of AboveNet stock
      over the ten trading days ending three trading days prior to the closing).
      If the closing price of the AboveNet stock on the day prior to the day it
      becomes tradable on NASDAQ is less than


<PAGE>   19


      the closing value of one share of AboveNet stock (based upon the average
      closing price of the AboveNet stock over the ten trading days ending three
      trading days prior to the closing), AboveNet will provide the shareholders
      at AboveNet's option, cash or additional shares AboveNet stock with a
      value sufficient to compensate them for such decrease.

(13)  REGISTRATION OF SHARES. If AboveNet chooses stock as the form of
      consideration the provisions of Clause 9 subpara 6 shall apply.

(14)  PAYMENT DUE DATE: Purchase Price shall be due and payable to RRZ within
      thirty (30) business days from (i) the Effective Date and (ii) in case of
      Art 10.9 the service of the arbitrator's opinion (10.9), respectively.


                                   SECTION 11
                 TRANSFER, REDEMPTION AND ENCUMBRANCE OF SHARES

(1)   TRANSFER OF SHARES: No shares of the company may be transferred without
      the approval of the Shareholders Meeting where an approval by 90 % of the
      outstanding shares is required, which approval shall not be unreasonably
      withheld, especially since the Parties are protected under the Right of
      First Refusal and the Call Options. Transfers of shares in the Company by
      the shareholders to Affiliates shall be subject to the other Parties'
      consent, which shall not be unreasonably withheld, and shall, in the case
      of consent, not constitute transfer to third parties.

(2)   REDEMPTION OF SHARES: After the transformation of the Company into an AG,
      the Company shall not have the right to redeem the Company's shares under
      any circumstances, except that if the holders of 90 % of the outstanding
      shares (including the shares held by AboveNet) agree to such redemption.

(3)   RESTRICTIONS ON ENCUMBRANCE: Shares may only be pledged or otherwise
      encumbered with the consent of the Shareholders Committee. If such consent
      is given, it is only valid if the pledgee concluded an agreement with the
      other Shareholders which grants such other Shareholders the rights
      provided for in this Agreement, particularly the right of first refusal.



<PAGE>   20


                                   SECTION 12
                               COMPETITION CLAUSE

(1)   NON-COMPETITION: Without the consent of the Company to be given by
      unanimous resolution of the Shareholders, the Parties may neither engage
      in the Company's line of business (co-location and connectivity services)
      nor acquire participations in companies that provide such services (such
      as Frontier, Exodus, Concentric, EUNet, PSI, AtHome, or Telekabel) in
      Austria. The members of the corporate bodies of the Company may not engage
      in any activities, self-employed or employed, including but not limited to
      accepting a position as managing or supervising body (e.g. shareholder
      committee, supervisory board), doing business for their own or for another
      persons account, or acquiring direct or indirect (e.g. through trustees)
      participations in a company that engages in the same line of business in
      Austria, as personally liable shareholders or through a capital interest
      of any kind.

(2)   TERM: The competition clause shall be valid for the term of this Agreement
      and a period of one year thereafter and shall be limited to the territory
      of Austria. The one year post-termination prohibition shall not apply in
      case of termination for cause, to the Party terminating for cause or in
      the event of a termination under Clause 15.3 hereunder.

(3)   SUSPENSION/TERMINATION: AboveNet and Affiliates shall not be bound (i)
      during suspension or following expiration of the exclusivity under the
      License Agreement (Exhibit./3) or following termination of the License
      Agreement itself and/or (ii) if any Affiliate of RRZ breaches this Clause
      12.

(4)   AFFILIATES: The competition clause applies to the Parties and to all
      Affiliates. It will not qualify as a violation of this non-compete
      provision if affiliates from Raiffeisen Upper Austria, Salzburg, Carinthia
      or Tyrol engage in competitive activities. In such case, AboveNet (and
      Affiliates) shall not be bound by the non-compete clause in the named
      area.

(5)   EXEMPTION WITH REGARD TO NETWAY: RRZ shall transfer all existing
      outsourcing businesses provided to Netway to the Company on a best price
      guarantee (i.e. the Company will charge the lowest price it charges other
      customers with comparable space and bandwidth requirements), and will not
      provide co-location services and (i.e. in combination with) Internet
      Connectivity services in this area to Netway or any other company. RRZ
      shall procure that Netway will not expand its co-location services and not
      competete with the Company unless all those services are outsourced to the
      Company and all related connectivity is purchased exclusively from the
      Company. Additionally, RRZ will procure that Netway will purchase a
      minimum of 75% of its entire connectivity


<PAGE>   21


      needs from the Company, provided that the Company offers competitive
      prices at comparable quality and purchase volume levels. A transition
      period of one year will apply to allow the completion of existing supplier
      agreements, provided however, that upon termination of any such agreement,
      it will not be renewed and be replaced with services from the Company
      until the condition of this paragraph is fulfilled. If this clause 12.5 is
      violated, AboveNet shall have the right to terminate the exclusivity of
      the license agreement, and shall no longer be bound by the competition
      provisions in this section 12 .

(6)   EMPLOYEES: The Company shall procure that each of the key employees of the
      Company shall enter into agreement not to compete with the Company during
      their employment by the Company and for one year thereafter, subject to
      continuation of salary payment for that one-year period. This provision
      shall not apply if the Company is sold and the individuals are employed
      with the acquirer.

(7)   SOLICITATION OF EMPLOYEES: AboveNet and RRZ shall not solicit or employ
      any employees of the Company without written consent of the Company,
      except for employees who have been dismissed for other than cause
      (Entlassung).


                                   SECTION 13
                               INSPECTION OF BOOKS

All shareholders shall have the right to inspect upon appropriate notice through
their (authorized) representatives the Company's general books and records and
to obtain photocopies of such books and records at all times.


                                   SECTION 14
                           ABOVENET STOCK OPTION PLAN

AboveNet intends to grant options to purchase AboveNet stock to employees of the
Company subject to applicable accounting and legal issues from time to time and
subject to separate option agreements to be concluded between AboveNet and the
beneficiary.. The aggregate number of options to be granted shall be for up to
100,000 shares over four years (up to 15,000 shares in year 1, up to 20,000 in
year 2, up to 25,000 shares in year 3, and up to 40,000 shares in year 4),
unless the Company is acquired by a third party prior to such time, upon
achievement of the revenue, net income and EBITDA targets in the Business Plan
attached


<PAGE>   22


hereto as Exhibit ./7 for the prior year. If the Company fails to meet such
targets in any year, no options will be issued. Within 60 days from the end of
the business year, the Company's auditors (currently Deloitte & Touche) shall
determine whether the Company succeeded or failed to meet the targets in the
Business Plan. The exercise price for the options shall be the fair market value
of the AboveNet stock on the date the options are issued.


                               III. GENERAL TERMS

                                   SECTION 15
                       TERM OF THE SHAREHOLDERS AGREEMENT

(1)   TERM: This Shareholders Agreement is concluded for an indefinite term.

(2)   DISSOLUTION: This Agreement shall be binding upon the Parties thereto
      until both Parties agree to dissolve the Agreement by unanimous written
      resolution, or if in case of (a) and (b) one of the Parties and in case
      (d) the non-breaching Party gives written notice of termination in case of

      (a)   dissolution or liquidation of the Company;

      (b)   initiation of insolvency proceedings over the assets of the Company,
            Above Net, or RRZ;

      (c)   an exercise of the Put Option under Clause 10; or

      (d)   a material breach by one of the Parties of any material obligation
            of the License Agreement or the Agreement hereunder;

      whereupon all rights and obligations under this Agreement shall
      immediately expire, unless a term of this Agreement expressly provides for
      a survival period.

(3)   EXIT AND EXIT PENALTY: The Parties may furthermore terminate this
      Agreement as of the end of any calendar quarter by providing the Company
      with at least three months prior written notice pursuant to Art 11 of the
      Articles of Association. Such termination notice must be sent by
      registered letter accompanied by telefax sent the same day to the Company
      and the other Party (i) If the effective date of termination is within the
      first 24 (twenty four) months following registration of the Company,


<PAGE>   23


      however, the exiting Party shall be subject to payment of a penalty of USD
      5,000,000 (five million) to the other Party. Additionally, the Party
      terminating shall lose its equity capital provided and all investments
      made. The remaining Party shall have the right to request from the exiting
      Party the assignment of the exiting Party's shares for a nominal transfer
      price of ATS 1 (one Austrian Shilling) within a notice period of four
      weeks following receipt of termination notice; such request must be by
      registered letter accompanied by telefax sent the same day to the exiting
      Party. Should the remaining Party choose not to exercise such right, the
      Company shall be liquidated as of the effective date of termination of the
      Agreement . The Parties undertake to vote for the liquidation of the
      Company requiring unanimous vote of the shareholders' meeting. (ii) If the
      effective date if termination is after the first 24 (twenty-four) months
      following the registration of the Company in the Companies' Register, no
      Termination Penalty shall apply. The remaining Party shall have the right
      to request from the exiting Party the assignment of the exiting Party's
      shares within a notice period of four weeks following receipt of
      termination notice; such request must be by registered letter accompanied
      by telefax sent the same day to the exiting Party. The transfer price
      shall be the fair market value of the shares as agreed between the Parties
      and failing such agreement on the amount of consideration for the Shares,
      it shall be determined by an Arbitration Expert who shall be appointed
      pursuant to the Rules described under Clause 10 above.

(4)   "ABOVENET" NAME: The parties acknowledge that neither RRZ nor the Company
      has any rights to the use of the name "AboveNet" or to any goodwill
      associated therewith save to the extent provided in the Licence Agreement.
      Thus, leaving further rights under the Licence Agreement unaffected, in
      case of loss of exclusivity under the Licence Agreement and/or if at any
      time AboveNet and/or its Affiliates cease to hold any shares in the
      Company, RRZ and the Company shall procure that the Company shall cease to
      use the name AboveNet for any purpose and shall take such steps as are
      necessary to remove such name from the registered corporate name of the
      Company and RRZ and its Affiliates shall not thereafter use or suffer to
      be used the name of AboveNet in connection with the operation of the
      Business.

(5)   EFFECTS: The validity of this Agreement shall also be applicable to all
      Shares acquired by the Parties in the future by way of purchase, in the
      course of capital increases or in any other manner.



<PAGE>   24


                                   SECTION 16
                                 CONFIDENTIALITY

(1)   CONFIDENTIAL INFORMATION: Each Party hereto undertakes for itself and for
      its Affiliates the fulfillment by which of this obligation it guarantees,
      to keep confidential the following information regarding the business
      operations of the Company or any of its subsidiaries and to prevent the
      passing on of this confidential information to third parties:

      (a)   any information that is specifically marked as "Confidential";

      (b)   information which the management of the Company or either of the
            Parties has requested in writing to be kept confidential;

      (c)   information which by its nature must be kept confidential in order
            to prevent adverse consequences to the business of the Company;

      (d)   information relating to the contents of this Agreement and its
            Exhibits.

(2)   LIMITATION ON THE FLOW OF INFORMATION: The Parties shall endeavor to give
      access to said confidential information only to such persons who are
      either bound by professional duty of confidentiality or who require
      knowledge of the information as employees, representatives, authorized
      persons, advisors, officers or directors of the respective Party or one of
      their Affiliated Companies for orderly conduct of business of the Party
      concerned. The Party shall also require the recipients of the information
      to undertake to keep the confidential information secret.

(3)   DURATION OF OBLIGATION: The obligation of this Clause shall continue to be
      in force even after a Party shall have ceased to be a partner to this
      Agreement or a Shareholder of the Company.

(4)   INFORMATION NOT TO BE KEPT SECRET: For the purpose of this Clause the
      following information shall not be considered to be confidential:

      (a)   information already the public domain;

      (b)   information which becomes known through no fault of the disclosee;

      (c)   information which becomes known independently of the disclosure;



<PAGE>   25

      (d)   information which is necessary to be disclosed in the course of a
            stock exchange listing of the Company or under the rules of the SEC
            or the Nasdaq National Market;

      (e)   information the disclosure of which is in the justified interest of
            one of the Parties in the course of the sale of his participation in
            the Company; the Party shall require the recipients of the
            information to undertake to keep the confidential information
            secret.

      Nothing herein shall be construed as preventing a Party from disclosing
      confidential information where it is under a duty, under applicable law,
      regulation, court or administrative decision to make such disclosure, such
      as, in case of AboveNet, in public filings with the SEC.

(5)   WAIVER: The Company hereby waives for itself any right to keep
      confidential any matters which are to be disclosed under this Agreement by
      members of the Management Board of the Company to the Parties.


                                   SECTION 17
                                      COSTS

(1)   All costs resulting from negotiating and drafting this Agreement,
      including, but not limited to, legal, accountancy and financial advisors
      fees, shall be borne by such Party where they occurred and shall not be
      reimbursable by the other Party or the Company.

(2)   No stamp duties and transfer taxes should arise in connection with the
      conclusion of this Agreement.

                                   SECTION 18
                                     GENERAL

(1)   ENTIRE AGREEMENT: This Agreement and the documents referred to in this
      Agreement contain the entire agreement between the Parties relating to the
      transactions contemplated by this Agreement and supersede any previous
      agreements between the Parties (if any) relating to these transactions.



<PAGE>   26


(2)   EFFECTS ON THIRD PARTIES: This agreement shall be binding upon each of the
      parties and their respective successors and assignees. The validity of
      this Agreement shall also be applicable to all Shares acquired in the
      future by way of purchase or in any other manner. Any acquirers of shares
      in the future shall be obliged to enter into this agreement. The Parties
      intend to seek a third shareholder for AboveNet Austria GmbH to increase
      the market potential for named Company. Following accession of such third
      Shareholder, the participation quotas is expected to be one third for each
      shareholder. Parties agree to amend this Shareholders Agreement in case of
      (i) the accession of parties different from the Parties to the
      Shareholders Agreement and/or (ii) transformation of AboveNet Austria GmbH
      into an AG and/or (iii) the establishment of a supervisory board and/or
      (iv) an IPO of AboveNet Austria GmbH being in preparation.

(3)   INTERPRETATION: Clause and subsection headings in this Agreement are for
      ease of reference only and do not affect the substance of any provision.
      Words denoting the singular include the plural and vice versa, words
      denoting any one gender include all genders. All references to a statutory
      provision shall be construed as including references to any statutory
      modification or re-enactment thereof (whether before or after the date of
      this Agreement) for the time being in force.

(4)   MODIFICATIONS TO AGREEMENT: This Agreement and its Exhibits shall not be
      amended orally and shall not be modified or discharged, in whole or in
      part, otherwise than by an instrument in writing signed by all Parties
      hereto or their successors or assignees.

(5)   NO THIRD PARTY BENEFICIARIES: This Agreement shall inure to the benefit
      of, and be binding upon, each of the Parties and their respective
      successors and assignees, subject to the provision of this Agreement, but
      shall not inure to the benefit of any third party. Except as expressly
      provided for under this Agreement, none of the rights and obligations
      under this Agreement may be assigned or transferred to third parties
      without the prior written consent of the other Party.

(6)   SEVERABILITY AND INVALIDITY: Should any provisions of this Agreement be or
      become wholly or partly invalid or unenforceable, this will not affect the
      validity or enforceability of the remaining provisions. The invalid or
      unenforceable provisions shall be substituted by a valid or enforceable
      provision which in its essential purpose comes as close as possible to the
      invalid or unenforceable provision; the same applies mutatis mutandis to
      any gaps in this Agreement.



<PAGE>   27


(7)   WAIVERS: The failure of any Party to enforce or to exercise, at any time
      or for any period of time any right or remedy arising pursuant to or under
      this Agreement does not constitute, and shall not be construed as, a
      waiver of such right or remedy and shall in no way affect that Party's
      right to enforce or exercise it later, provided that such right is not
      time barred or precluded. Any waiver to this effect must be in writing.

(8)   EXHIBITS: All exhibits to this Agreement are an integral part of this
      Agreement as if fully set forth herein. All references herein to an
      exhibit shall be deemed to be references to a clause of this Agreement
      unless the context shall otherwise require.

(9)   NOTICES: All notices required or permitted by this Agreement shall be in
      writing, be given by an authorized representative of the relevant Party
      and shall be sent to the recipient via registered mail and telefax to the
      address set forth below or an address to be provided by the relevant Party
      in writing and via registered mail under reference to this Clause to the
      other Party:

      If to RRZ:
      Raiffeisen Rechenzentrum Ges.m.b.H
      attn:    Mr. Martin Hell
               Mr. Wilfried Pruschak
      1020 Vienna, Hollandstrasse 11-13

      If to AboveNet:
      AboveNet Communications, Inc.
      attn:    Mr. Warren J. Kaplan
               Dr. Paul Steiner
      50 W. San Fernando Street, #1010, San Jose, CA 95113

(10)  COUNTERPARTS: This Agreement is executed in two counterparts, each of
      which shall be deemed an original and both of which together shall
      constitute one and the same instrument.

(11)  LANGUAGE: This Agreement has been produced in the English language and the
      negotiations relating to this Agreement were conducted in English; any
      translations are for working purposes only and have no influence on the
      interpretation of this Agreement.



<PAGE>   28

(12)  ANNOUNCEMENTS: No announcement concerning this Agreement or its subject
      matter or any ancillary matter shall be made by any Party except as
      permitted herein or as required by law without the prior written approval
      of the other Parties such approval not to be unreasonably withheld or
      delayed.


                                   SECTION 19
                           APPLICABLE LAW, ARBITRATION

(1)   APPLICABLE LAW: The validity, interpretation and performance of this
      Agreement shall be governed by the laws of the Republic of Austria,
      excluding the rules regarding choice of law and excluding the United
      Nations Convention on Contracts for the international sale of goods.

(2)   ARBITRATION CLAUSE: Any disputes arising out of or in connection with this
      Agreement, including disputes on its conclusion, binding effect, amendment
      and termination shall be finally settled by a three-person Arbitration
      Tribunal under the Rules of Arbitration of the International Chamber of
      Commerce (ICC). AboveNet and RRZ shall each nominate one arbitrator, who
      shall be confirmed by the Court of Arbitration of the International
      Chamber of Commerce. If one Party fails to nominate an arbitrator within
      four weeks after the institution of the arbitration proceedings, the Court
      of Arbitration shall appoint such arbitrator. The third arbitrator shall
      be appointed jointly by the arbitrators and confirmed by the Court of
      Arbitration. If the two arbitrators fail to agree on the appointment of
      the chairman within four weeks of confirmation, the chairman shall be
      appointed by the Court of Arbitration.

(3)   PLACE, LANGUAGE: The place of the arbitration shall be Vienna, the
      language of the arbitration proceedings shall be English without
      translation. The Arbitral Tribunal has to decide in the award which party
      has to bear the costs of the arbitration (or in what proportions the costs
      shall be borne by the Parties) including the fees of counsel having
      assisted the Parties.

(4)   INJUNCTIVE RELIEF:: The Parties hereto agree that, in addition to any and
      all other remedies that may be available under this Agreement and its
      Exhibits, each Party shall be entitled for the enforcement of its claims
      to injunctive relief as may be granted by a court of competent
      jurisdiction.



<PAGE>   29

Vienna, this


- -----------------------------------------
For Raiffeisen Rechenzentrum Ges.m.b.H


- -----------------------------------------
For AboveNet Communications, Inc.



- -----------------------------------------
For AboveNet Communications GmbH, joining the Agreement and signing with respect
to Clauses which shall bind the Company, e.g. Arts 5/2, 12/6.

<PAGE>   1

                                                                   EXHIBIT 10.37

CONFORMED COPY

                                              Register of Deeds No. 297 for 1999

                                   NEGOTIATED

                              In FRANKFURT AM MAIN

on 25 March 1999 appeared before me

                                DR. GERHARD HESS

notary (Notar) in Frankfurt am Main, with offices in Taunusanlage 11, 60325 
Frankfurt am Main the following persons who appeared at the request of the 
following Appearants at the offices of Oppenhoff & Radler Linklaters & Alliance 
at Mainzer Landstrasse 16, 60325 Frankfurt am Main:

1.   Dr. Paul Steiner, born 19.05.56 with offices at AboveNet Communications, 
     Inc., 50 W. San Fernando Street, No. 1010, San Jose, CA 95113, USA

     acting not in his own name, rather in the name of:

     AboveNet Communications, Inc., 50 W. San Fernando Street, No. 1010, San 
     Jose, CA 95113, USA as its Vice President, International,

2.   Mr Albrecht Wilhelm Kraas, born 07.07.1965 in Ludenscheid, residing at 
     Pommernstr. 11, 53119 Bonn,

3.   Mr Andreas Friedrich Schachtner, born 08.05.1962 in Essen, residing at 
     Dessauer Str. 12, 44263 Dortmund,

4.   Mr Michael Schneider, attorney, born 13.06.1962 in Bergneustadt, residing 
     at Auf der Draveler Wiese 23, 53639 Konigswinter-Ittenbach, acting both in 
     his own name and in the name of

     a.   Ms. Petra Schreck, Haussdorffstrasse, 189, 53129 Bonn

          on the basis of a power of attorney dated 24 March 1999, a copy of 
          which is certified and attached to this notarial document as 
          ATTACHMENT 1, and

     b.   Ms. Elke Schneider, Auf der Draveler Wiese 23, 53639 Konigswinter

          on the basis of a power of attorney dated 23 March 1999, a copy of 
          which is certified and attached to this notarial document as 
          ATTACHMENT 2.

<PAGE>   2
Appearant No. 1 identified himself by presenting his Austrian passport. 
Appearants Nos. 2, 3 and 4 identified themselves by presenting their German 
personal identity cards (Personalausweise).

Appearant No. 1, acting as stated, and Appearant No. 4, acting solely on behalf 
of Ms. Petra Schreck and Ms. Elke Schneider first requested notarization of the 
Purchase Agreement attached hereto as ATTACHMENT 3.

The Appearants 1, 2 and 3, acting as stated, and Appearant No. 4 acting solely 
in his own name, then requested the notarization in English of the Cooperation 
Agreement and Exhibits attached to this notarial document as ATTACHMENT 4 and 
the related shareholders resolutions. The notary informed the Appearants about 
their right to have translations of the English documents, and the Appearants 
stated that this was not desired.

The notary if fluent in the English language and has convinced himself that the 
Appearants are also fluent in English and German.

The notary explained the prohibition on acting as a notary under Section 3 
para. 1 No. 7 "Beurkundungsgesetz" (Statute on Executing Deeds). The Appearants 
answered the notary's question about whether his firm had acted for the parties 
in the past on this matter in the negative.

The notarial document, including Attachments, was read to the Appearants, 
approved by them and signed by the notary and the Appearants in their own hands 
as follows:

[SIG ILLEGIBLE]                     [SIG ILLEGIBLE]

[SIG ILLEGIBLE]                     [SIG ILLEGIBLE]

[SIG ILLEGIBLE]                     

<PAGE>   3
                                                                    Attachment 1



                               V O L L M A C H T


HIERMIT WIRD IN SACHEN     InternetTreuhand GmbH

WEGEN                      Verausserung und Ubertragung meiner Geschafgtsanteile
                           an der InternetTreuhand GmbH

HERRN RECHTSANWALT MICHAEL SCHNEIDER VOLLMACHT ERTEILT.



Die Vollmacht erstreckt sich auf die Verausserung und Ubertragung aller 
Geschaftsanteile, die ich, Dr. Petra Schreck, Dipl. Geographin, geboren am 
09.10.1967 in Langerwehe, wohnhaft Haussdorffstrasse 189, 53129 Bonn, an der 
InternetTreuhand GmbH (AG Bonn, HRB 7642) halte. Hierbei handelt es sich um 
einen Geschaftsanteil in Hohe von 45.000,00 DM, bei einem Stammkapital der 
Gesellschaft von insgesamt 50.000,00 DM also um 90% der Geschaftsanteile. Diese 
sollen an die Firma AboveNet Communications, Inc., 50 W. San Fernando St., 
#1010, San Jose, CA 95113 veraussert und ubertragen werden. 

Die Vollmacht erstreckt sich weiterhin auf alle mit der Verausserung und 
Ubertragung zusammenhangenden Rechtsgeschafte, insbesondere den Abschluss einer 
Schiedsvereinbarung.



         Bonn                       24.3.99               /s/  Petra Schreck
- -----------------------     -----------------------     -----------------------
         Ort                         Datum                     Unterschrift





          Vorstehande Ablichtung ist ein
          vollsstendiges Lichthild der Urschrift.

          Frankfurt am Main, den


             24.3.99            [signature]            [SEAL]
          -------------   -----------------------
                                   Notar
<PAGE>   4
                                                                    Attachment 2

                                   VOLLMACHT


HIERMIT WIRD IN SACHEN      Internet Treuhand GmbH

WEGEN                       VerauBerung und Ubertragung meiner Geschaftsanteile
                            an der Internet Treuhand GmbH

HERRN RECHTSANWALT MICHAEL SCHNEIDER VOLLMACHT ERTEILT.


Die Vollmacht erstreckt sich auf die VerauBerung und Ubertragung aller
Geschaftsanteile, die ich, Elke Schneider geborene RoB, Dipl. Oecotrophologin,
geboren am 04 June 1961, wohnhaft in 53639 Konigswinter-Ittenbach, Auf der
Draveler Wiese 23, an der InternetTreuhand GmbH (AG Bonn, HRB 7642) halte.
Hierbei handelt es sich um einen Geschaftsanteil in Hohe von 5.000,00 DM, bei
einem Stammkapital der Gesellschaft von insgesamt 50.000,00 DM also um 10% der
Geschaftsanteile. Diese sollen an die Firma AboveNet Communications, Inc., 50 W.
San Fernando St., #1010, San Jose, CA 95113 verauBert und ubertragen werden.

Die Vollmacht erstreckt sich weiterhin auf alle mit der VerauBerung und 
Ubertragung zusammenhangenden Rechtsgeschafte, insbesondere den AbschluB einer 
Schiedsvereinbarung.  



[Illegible]                   23.03.99            /s/ [Signature Illegible]
- ---------------              ----------           -------------------------
    Ort                        Datum                    Unterschrift


          Verstehende Ablichtung ist ein
          voilstandiges Lichtbild der Urschrift.
     
          Frankfurt am Main, den                  [DR. GERHARD HESS NOTARY
                                                   IN FRANKFURT AM MAIH]

          24.3.99        /s/ [Signature Illegible]
          -----------    -------------------------     

<PAGE>   5
                                                                    ATTACHMENT 3


                        PURCHASE AND TRANSFER AGREEMENT

between

1.   Ms. Petra Schreck, Haussdorffstrasse 189, 53129 Bonn, and

2.   Ms. Elke Schneider, Auf der Draveler Wiese 23, 53639 Konigswinter

(also referred to as the "Sellers")

and

AboveNet Communications, Inc., 50 W. San Fernando Street, No. 1010, San Jose, 
CA 95113, USA, ("AboveNet")

                                   SECTION 1

Ms. Schreck holds one share with the nominal value of DM 45,000 and Ms. 
Schneider holds one share in the nominal value of DM 5,000 in the limited 
liability company (Gesellschaft mit beschrankter Haftung) InternetTreuhand 
Gesellschaft fur Registrierungsdienste mbH, registered under No. HRB 7042 in 
the commercial register maintained at the Municipal Court (Amtsgericht) in 
Bonn. The capital contributions for the shares have been fully paid in cash. No 
other shares exist.

                                   SECTION 2

Each of the Sellers hereby sells and transfers all of her respective share to 
AboveNet which accepts the sale and transfer. The transfer is effective with 
economic effect as of notarization.

                                   SECTION 3

The purchase price for the shares is DM 49,000 which is immediately due for 
payment upon execution of this agreement. AboveNet is rendering payment by 
wire transfer of the purchase price today to the following account:

     ACCOUNT HOLDER:          SCHNEIDER & SCHOLLMEYER

     TRUST ACCOUNT NO.:       3766593029

     BANK:                    VOLKSBANK BONN-RHEIN-SIEG, HENNEF

     GERMAN BANK CODE:        38060186

     SWIFT CODE:              GENO DE DD
     
     REFERENCE:               PURCHASE PRICE GERMANY


<PAGE>   6
                                                                    Attachment 4



                             COOPERATION AGREEMENT


between

AboveNet Communications, Inc., 50 W. San Fernando Street, No. 1010, San Jose, 
CA 95113, USA

                                                      (hereinafter, "AboveNet"),

and

1.   Mr. Albrecht Wilhelm Kraas, residing at Pommernstr. 11, 53119 Bonn,

2.   Mr. Andreas Friedrich Schachtner, residing at Dessauer Str. 12, 44263 
     Dortmund,

3.   Mr. Michael Schneider, residing at Auf der Draveler Wiese 23, 53639 
     Konigswinter-Ittenbach

                                             (hereinafter, the "NRW Principals")



                                  INTRODUCTION

A.   AboveNet and the NRW Principals wish to establish a jointly held German
     company which will provide carrier class facilities, including co-location
     and internet connectivity services ("Internet Service Exchange").

B.   AboveNet and the NRW Principals control certain software and intellectual
     property which will enable the German company to establish the Internet
     Service Exchange, and AboveNet and the NRW Principals intend to make this
     software and intellectual property available to the German company.

C.   AboveNet is today acquiring all shares in a German limited liability
     company (the "GmbH") which is currently only a shelf company. This GmbH
     will become the jointly held German company. The parties wish to increase
     the capital of the GmbH and redraft the articles of association
     accordingly. The parties, acting in their capacities as shareholders, will
     then conduct a first shareholders meeting and resolve further steps to be
     taken by the GmbH, including the conclusion of employment agreements with
     the NRW Principals, conclusion of a License, Connectivity and Marketing
     Agreement between AboveNet and the GmbH and adopting a business plan.

D.   In order to provide general rules for the course of the cooperation and
     implement the first stages of the cooperation, the parties are entering
     into this Cooperation Agreement.
<PAGE>   7
Each of the Sellers warrants (steht dafur ein) as follows:

4.1  Each of the statements contained in Section 1 is correct.

4.2  The shares do not represent more than 70% of each Seller's net worth
     (Vermogen).

4.3  Each Seller can dispose freely of her share.

4.4  The company's Articles of Association in the version on record at the
     commercial register have not been amended.

4.5  Ms. Elke Schneider is registered as a Managing Director (Geschaftsfuhrer)
     of the company. No other Managing Directors or "Prokuristen" have been
     appointed. No applications for the company are pending at the commercial
     register.

4.6  The sole asset of the Company is a bank account with a current balance
     today of at least DM 49,000. The Company has no liabilities
     (Verbindlichkeiten).


                     ---------      ---------      --------
<PAGE>   8
                                                                             -2-

                                   SECTION 1

                         CAPITAL INCREASE IN THE GMBH,
                          NEW ARTICLES OF ASSOCIATION

1.1   AboveNet is the sole shareholder in InternetTreuhand Gesellschaft fur 
      Registrierungsdienste mbH, registered in the commercial register 
      maintained at the municipal court (Amtsgericht) in Bonn. AboveNet hereby 
      waives all requirements of notice and form for calling a shareholders 
      meeting and conducts a shareholders meeting in InternetTreuhand 
      Gesellschaft fur Registrierungsdienste mbH and resolves as follows:

      a.  The existing two shares in the nominal value of [*] and [*] are 
          hereby combined to form a single share in the nominal value of [*].

     b.   The stated capital of the company is hereby increased to a total of 
          E 192,000. The nominal value of the above share is increased to 
          E 96,000 and three additional shares in the nominal values of 
          E 32,000 each are issued.

     c.   The increase in the existing share capital can be subscribed to by 
          AboveNet Communications, Inc. The three shares of E 32,000 each can 
          be subscribed to by each of Mr. Albrecht Wilhelm Kraas, Mr. Andreas 
          Friedrich Schachtner and Mr. Michael Schneider.

     d.   The capital contributions to be paid by each of Mr. Kraas, Mr. 
          Schachtner and Mr. Schneider are [*] each. AboveNet will make 
          its contribution by paying the difference between [*] and [*], 
          thus [*]. All contributions are immediately due for payment in cash.

     e.   In addition to the capital contributions, AboveNet will also pay a 
          premium to the capital reserve (Kapitalrucklage) in the amount of 
          [*] at the same time as it pays its capital contribution.

1.2  Mr. Kraas, Mr. Schachtner and Mr. Schneider each hereby subscribes to a 
     share in the company in the nominal value of [*] in accordance with 
     para. 1.1 c and d. AboveNet hereby subscribes to the increase in its share 
     in accordance with para. 1.1 c and d.

1.3  The parties hereby waive all requirements of form and notice for 
     conducting a shareholders meeting and hereby conduct a shareholders 
     meeting in which they adopt new articles of association for the company as 
     set forth in ANNEX 1a in German and ANNEX 1b in English.

THE SHAREHOLDERS CONTINUE THE MEETING AND RESOLVE THE FOLLOWING ITEMS IN
SECTIONS 2, 3 AND 4.


*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.
<PAGE>   9

                                                                             -3-

                                   SECTION 2

                   NON-MONETARY CONTRIBUTIONS, FUTURE FUNDING

2.1  AboveNet Deutschland GmbH will conclude the royalty free "License, 
     Connectivity and Marketing Agreement" with AboveNet Communications, Inc. 
     attached as ANNEX 2.

2.2  AboveNet Deutschland GmbH will obtain from IntraNet Gesellschaft fur 
     Telekommunikation und Consulting GmbH a perpetual, royalty free, 
     non-exclusive license to AboveNet Deutschland GmbH to use the software and 
     related intellectual property listed in ANNEX 3 for the purpose of 
     operating its own business. Nrs. 4 and 11 of the License, Connectivity and 
     Marketing Agreement will apply mutatis mutandis (entsprechend).

2.3  The shareholders anticipate that they will obtain one or more additional
     investors who agrees to invest additional capital in an amount equal to
     [*] in AboveNet Deutschland GmbH. At that time AboveNet Communications, 
     Inc. will also invest at least the same amount. The form of the AboveNet 
     investment will be (at AboveNet's option) either the same securities as
     are sold to the third party investors or a note convertible, at any time
     at the option of the holder, into equity securities with a five year term
     with interest payments only during such term. The valuation of AboveNet
     Deutschland GmbH at which AboveNet's investment is made will be the same
     valuation as the third party investment. The convertible debt would be
     convertible into the same security as sold to the third party and the note
     would bear interest at a market interest rate. Both these investments will
     change the relative percentage ownership of the Company, increasing the
     percentage ownership of AboveNet and decreasing the ownership of the NRW
     Principals. The exact form of the third party's investment and AboveNet's
     investment will be determined at the time the investments are resolved.
     The parties understand that there are certain restrictions under German
     law on the extent to which debt can be converted to voting shares and the
     extent to which debt to a shareholder can be repaid.

                                   SECTION 3

                             EMPLOYMENT AGREEMENTS

Each of Messrs. Schneider, Kraas and Schachtner will enter into an employment 
agreement as managing directors (Geschaftsfuhrer) with AboveNet Deutschland 
GmbH in accordance with the terms set forth in ANNEX 4a, 4b and 4c.

                                   SECTION 4

                       APPOINTMENT OF MANAGING DIRECTORS,
                               RULES OF BUSINESS

The contract partners hereby appoint Mr. Michael Schneider, Mr. Kraas and Mr. 
Schachtner as managing directors (Geschaftsfuhrer) of AboveNet Deutschland 
GmbH. Each of them is granted sole signing authority. Frau Elke Schneider is 
removed as managing director (Geschaftsfuhrerin). Her past conduct of the 
business is ratified (Entlastung wird erteilt).

THE SHAREHOLDERS MEETING IS NOW CONCLUDED. NO FURTHER RESOLUTIONS ARE PASSED.



*  Certain information on this page has been omitted and filed separately with
   the Commission. Confidential treatment has been requested with respect to the
   omitted portions.

<PAGE>   10
                                                                             -4-

                                   SECTION 5
                              LICENSE TO ABOVENET

5.1   Messrs. Kraas, Schachtner and Schneider will cause IntraNet Gesellschaft
      fur Telekommunikation und Consulting GmbH to grant a perpetual, royalty
      free, non-exclusive license to AboveNet Communications, Inc. to use the
      software and related intellectual property listed in ANNEX 5 for its own
      purposes and the purposes of its affiliates (Section 15 Stock Companies
      Act) until AboveNet becomes a shareholder in another German company
      providing services under the "AboveNet" name. Further development and
      support will be provided at standard commercial rates (marktublichen
      Preisen). Nrs. 4 and 11 of the License, Connectivity and Marketing
      Agreement will apply mutatis mutandis (entsprechend).

5.1   Messrs. Kraas, Schachtner and Schneider will cause IntraNet Gesellschaft 
      fur Telekommunikation und Consulting GmbH to transfer the domain names 
      "AboveNet.de", "Above.de" to the GmbH.

                                   SECTION 6
                      TRANSFORMATION INTO A STOCK COMPANY

6.1   The contract partners anticipate transforming the GmbH into a stock 
      company which will have stated capital (Grundkapital) of at least 
      E1,000,000 of which between 5% and 10% will be made available for 
      employee stock options which will entitle employees to purchase stock on 
      the date the options vest (4 year vesting period) at the fair market 
      value of the shares on the date the options were granted. The number of 
      shares reserved for the options cannot be increased before an initial 
      public offering without the unanimous consent of the members on the 
      Supervisory Board. This anticipation of the contract partners to 
      transform the GmbH into a stock company does not create an obligation on 
      the part of the contract partners to themselves invest further capital.

6.3   When the GmbH is transformed into a stock company, the contract partners 
      will adapt as many of the provisions in the GmbH articles of association 
      as possible into the articles of association of the stock company. To 
      the extent that this is not possible, the contract partners will enter 
      into a shareholders agreement which includes such provisions. In 
      particular, if the contract partners establish the stock company with 
      bearer shares, the restrictions on dispositions of shares and 
      cancellation of shares set forth in Section VII of Annex 1 will apply 
      mutatis mutandis among the previous shareholders in the GmbH. If the 
      contract partners establish the stock company with registered shares 
      (vinkulierte Namensaktien), they will include corresponding provisions in 
      the articles of association of the stock company.

                                   SECTION 6a
                             ABOVENET STOCK OPTIONS

AboveNet intends to grant options to purchase AboveNet stock to employees of the
GmbH subject to applicable accounting and legal issues from time to time and 
subject to separate option agreements to be concluded between AboveNet and the 
beneficiary. The aggregate number of options to be granted 
<PAGE>   11
shall be for up to 100,000 shares over four years (up to 15,000 shares in
year 1, up to 20,000 in year 2, up to 25,000 shares in year 3, and up to 40,000
shares in year 4), unless the Company is acquired by a third party prior to such
time, upon achievement of the revenue, net income and EBITDA targets in the
Business Plan for the prior year. If the Company fails to meet such targets in
any year, no options will be issued. Within 60 days from the end of the business
year, the Company's auditors (currently Deloitte & Touche) shall determine
whether the Company succeeded or failed to meet the targets in the Business
Plan. The exercise price for the options shall be the fair market value of the
AboveNet stock on the date the options are issued.

                                   SECTION 7
                       CHOICE OF LAW, DISPUTE RESOLUTION

7.1  This Cooperation Agreement and all other agreements referred to herein are
     governed by German law, except for the "License, Connectivity and Marketing
     Agreement" with AboveNet Communications, Inc. which will be governed by
     California law.

7.2  If any provision in this Cooperation Agreement or any of the other 
     agreements referred to herein is invalid, the remaining provisions and 
     agreements will remain valid. The invalid provision will be deemed to have 
     been replaced by a valid provision which comes as close as legally 
     permissible to achieving the commercial effect of the invalid provision.

7.3  All disputes between the parties will be resolved in accordance with the 
     separate arbitration agreement attached as ANNEX 6. This Arbitration 
     Agreement does not, however, apply to the "License, Connectivity and 
     Marketing Agreement" which contains its own arbitration clause.
 

<PAGE>   1
                                                                   EXHIBIT 10.38
                                                                             C1.

DATED                                  MARCH                               1999
- -------------------------------------------------------------------------------


                           ABOVENET COMMUNICATIONS INC

                        MR. W. DOBBIE AND MR. A. MACSWEEN

                                     - and -

                               ABOVENET UK LIMITED

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

                             SHAREHOLDERS AGREEMENT
                                   RELATING TO
                               ABOVENET UK LIMITED
               --------------------------------------------------






                                   TARLO LYONS
                                Watchmaker Court
                               33 St. John's Lane
                                     London
                                    EC1M 4DB
                               Tel: 0171-405 2000
                               Fax: 0171-814 9423
                               Ref: RLH/RAC/334107


<PAGE>   2

                                    CONTENTS
<TABLE>
<CAPTION>

Clause No.                                                                              Page
- ----------                                                                              ----
<S>                                                                                      <C>
1.   INTERPRETATION.......................................................................1

2.   ESTABLISHMENT OF THE COMPANY.........................................................6

3.   WARRANTIES BY FOUNDERS...............................................................7

4.   OBJECTIVES OF THE COMPANY............................................................7

5.   DIRECTORS AND CHAIRMAN...............................................................8

6.   BOARD MEETINGS.......................................................................9

7.   SECRETARY...........................................................................10

8.   REGISTERED OFFICE...................................................................10

9.   AUDITORS............................................................................10

10.  ACCOUNTING REFERENCE DATE...........................................................10

11.  BANKERS.............................................................................10

12.  COMPANY BOOKS RECORDS AND ACCOUNTS..................................................11

13.  OPERATION OF THE COMPANY............................................................12

14.  KEY EMPLOYEES.......................................................................16

15.  INSURANCE OBLIGATIONS...............................................................16

16.  EMPLOYEE SHARE OPTION SCHEME(S).....................................................17

17.  DUE ADMINISTRATION OF THE COMPANY...................................................18

18.  GLOBAL TECHNICAL COMMITTEE..........................................................19

19.  TRANSFER OF SHARES..................................................................19

20.  CHARGING OF SHARES..................................................................27

21.  FINANCE.............................................................................28

22.  DIVIDEND POLICY.....................................................................30

23.  PURCHASE OPTION.....................................................................31

24.  DEFAULT.............................................................................35

25.  LEGEND ON SHARE CERTIFICATES........................................................42

26.  CONFIDENTIALITY AND DISCLOSURE......................................................42

27.  NON-COMPETITION.....................................................................43

28.  NON-SOLICITATION....................................................................43

29.  ASSIGNMENT..........................................................................44

30.  PROPRIETARY KNOW-HOW................................................................45

31.  NAMES...............................................................................45

32.  TERM................................................................................45

33.  INTEREST............................................................................46

34.  SEVERABILITY........................................................................46

</TABLE>

<PAGE>   3
<TABLE>

<S>                                                                                     <C>
35.  CONFLICT WITH ARTICLES..............................................................46

36.  NO PARTNERSHIP......................................................................47

37.  FURTHER ASSURANCE...................................................................47

38.  COSTS...............................................................................47

39.  ENTIRE AGREEMENT....................................................................47

40.  VARIATION...........................................................................48

41.  WAIVER/FORBEARANCE..................................................................48

42.  EXECUTION IN COUNTERPARTS...........................................................48

43.  NOTICES.............................................................................48

44.  GOVERNING LAW AND JURISDICTION......................................................50

THE SCHEDULE (FORM OF SUPPLEMENTAL DEED).................................................51

AGREED TERM DOCUMENTS:
A.      Articles of Association
B.      Draft Business Plan
C.      Dobbie Service Agreement
D.      MacSween Service Agreement
E.      Key Employee Agreements
F.      Licence Agreement
G.      Stock Purchase Agreement
H.      Loan Note Instrument
</TABLE>

<PAGE>   4
                             SHAREHOLDERS AGREEMENT

DATE:           March 1999

PARTIES:

(1)     ABOVENET COMMUNICATIONS, INC a corporation incorporated in the State of
        California USA on 8 March 1996 and reincorporated in the State of
        Delaware, USA in November 1998 whose business address is 50, W. San
        Fernando Street SE1010, San Jose, California, 95113, USA (together with
        its successors in title and permitted assigns `Inc'); and

(2)     WILLIAM DOBBIE of 1 Belgrave Crescent, Edinburgh EH4 3AQ and ANGUS
        MACSWEEN of 5 Ellergreen Road, Bearsden, Glasgow GG1 2AJ (together with
        their respective successors in title "the Founders", which expression
        shall include either or both of them); and

(3)     ABOVENET UK LIMITED a company incorporated in England (CR No. 3740487)
        whose registered office is situate at 63 Queen Victoria Street, London
        EC4 (together with its successors in title and permitted assigns `the
        Company').

RECITALS:

(A)     The Company is a private company incorporated in England on 22 March
        1999 under the Companies Acts 1985 and 1989 and has at the date hereof
        an authorised share capital of Pound Sterling1,111,000 divided into
        1,111,000 Ordinary Shares of Pound Sterling1.00 each, 600,000 of which
        shares have been issued fully paid to the Founders

(B)     The parties have agreed to procure that the business of the Company is
        conducted in accordance with the provisions of this Agreement.

OPERATIVE PROVISIONS:


1.      INTERPRETATION

        In this Deed and its Recitals and Schedules:

        `Affiliate' means with respect to any person (a) any entity of which the
        ownership interests conferring a majority of votes at meetings of
        interest owners of such entity are owned directly or indirectly by such
        person or (b) any entity which owns, directly 


                                                                          Page 1
<PAGE>   5

        or indirectly, ownership interests of such person conferring a majority
        of votes at meetings of interest owners of such person or (c) any entity
        of which the ownership interests conferring a majority of votes at
        meetings of interest owners of such person are owned directly or
        indirectly, by an entity which also owns ownership interests conferring
        a majority of votes at meetings of interest owners of such person or (d)
        any participator in relation to any such entity or a director of any
        such entity or any associate or relative of either thereof (if an
        individual) (all as such terms are defined in Section 417 of the Taxes
        Act)

        `in the Agreed Terms' means in the form of an annexed draft agreed
        between the parties and initialed by way of identification by the
        parties or their respective legal advisers

        `the Articles' means the Articles of Association of the Company to be
        adopted pursuant to Clause 2.1.1 as amended from time to time

        `an `A' Director' means a director appointed by the holder or holders of
        the `A' Shares in accordance with Article 16 of the Articles and unless
        otherwise stated, includes his duly appointed alternate

        ``A' Shares' means the `A' Ordinary Shares of Pound Sterling1.00 each
        more particularly referred to in Clause 2.1.5 and any other shares so
        designated or, where the context so admits, so many thereof as may from
        time to time be in issue

        `a `B' Director' means a director appointed by the holder or holders of
        75% in nominal value of the `B' Shares in accordance with Article 16 of
        the Articles and unless otherwise stated, includes his duly appointed
        alternate

        ``B' Shares' means the `B' Ordinary Shares of Pound Sterling1.00 each
        more particularly referred to in Clause 2.1.5 and any other shares so
        designated, or where the context so admits, so many thereof as may from
        time to time be in issue

        `the Board' means the board of directors of the Company for the time
        being or from time to time

        `the Business' means the business of establishing and operating an
        Internet Co-location Centre and Internet Service Exchange, including
        occupying and maintaining a property for an Internet Co-location Centre,
        operating related local network infrastructure in cooperation with Inc,
        and marketing and sales activities relating to the sale of services and
        products detailed in the Licence Agreement

                                                                          Page 2
<PAGE>   6

        `the Business Plan' means the four year business plan in the form to be
        agreed by the Original Shareholders pursuant to Clause 2.2 but pending
        such agreement shall mean the Draft Business Plan

        ``C' Shares' means the `C' Ordinary Shares of Pound Sterling1.00 each
        more particularly referred to in Clause 2.1.5 and any other shares so
        designated, or where the context so admits, so many thereof as may from
        time to time be in issue

        `Controlling Interest' means in relation to any company the holding
        (directly or indirectly) of more than 50 per cent of the Equity Share
        Capital of that company or the ability to direct the casting of more
        than 50 per cent of the votes normally entitled to be cast at a
        shareholders' meeting of that company and for the purposes of
        ascertaining whether any Person shall have a Controlling Interest (as
        defined) account shall also be taken of the shareholding or voting
        rights held by any Affiliate of that Person

        `Convertible Loan Notes' means convertible loan notes of the Company
        constituted by the Loan Note Instrument

        `Director' means any director for the time being of the Company
        including where applicable any alternate director

        `Draft Business Plan' means the draft four year business plan in the
        Agreed Terms

        `the Effective Date' means the date on which the various matters
        referred to in Clause 2.1 are completed

        `Equity Share Capital' shall have the meaning ascribed to such
        expression by Section 744 of the UK Companies Act 1985

        `Financial Year' means the financial year (as defined in the UK
        Companies Act 1985) of the Company, being the year from 22 March 1999 to
        30 June 2000 and thereafter the year ending on 30 June in each year

        `Group Company' means, in relation to any company, any Holding Company
        of that company and any Subsidiary of that company or of any of its
        Holding Companies

        `Inc's Original Holding' means the 133,334 `A' Shares subscribed by Inc
        pursuant to Clause 2.1.6, any further `A' Shares subscribed by it
        pursuant to Clause 2.2 and any 

                                                                          Page 3
<PAGE>   7

        `A' Shares acquired by it as a consequence of exercising its conversion
        rights under any Convertible Loan Note(s)

        `ISP' means an internet service provider

        `Key Employees' means such senior employees of the Company as the Board
        shall from time to time determine

        `Key Employee Agreement' means an agreement to be entered into between
        the Company and each of the Key Employees, each such agreement being in
        or substantially in the Agreed Terms

        `Licence Agreement' means the License, Connectivity and Marketing
        Agreement between Inc (1) and the Company (2) in the Agreed Terms

        `Loan Note Instrument' means the instrument constituting Pound
        Sterling1,200,000 5 per cent Convertible Loan Notes of the Company in
        the Agreed Terms

        `Mr. Dobbie' means Mr. William Dobbie, one of the Founders

        `the Dobbie Service Agreement' means the service agreement between the
        Company (1) and Mr. Dobbie (2) in the Agreed Terms

        "Mr. MacSween" means Mr. Angus MacSween, one of the Founders

        `the MacSween Service Agreement' means the service agreement between the
        Company (1) and Mr. MacSween (2) in the Agreed Terms

        `Ordinary Shares' means the `A' Shares and/or (as the context requires)
        the `B' Shares and/or (as the context requires) the `C' Shares in the
        capital of the Company

        `the Original Shareholders' means Inc and the Founders

        `Person' includes and individual, corporation, unincorporated
        association or partnership

        `Retention Account' shall have the meaning ascribed to such expression
        by Clause 2.3

        `Share' means a share in the capital of the Company of whatever class



                                                                          Page 4
<PAGE>   8

        `the Shareholders' means the Original Shareholders or any Person or
        Persons to whom they lawfully transfer their Shares or who is or are
        allotted Shares in the Company pursuant to the provisions of this
        Agreement

        `Subsidiary' and 'Holding Company' shall bear the meanings ascribed to
        such expressions by Section 736 of the UK Companies Act 1985

        `Supplemental Agreement' means an agreement entered into pursuant to
        Clause29.2.

        `Taxes Act' means the UK Income and Corporation Taxes Act 1988.

1.2     In this Agreement, references to any statutory provision shall include
        such provision as from time to time amended, whether before on or (in
        the case of re-enactment or consolidation only) after the date hereof,
        and shall be deemed to include provisions of earlier legislation (as
        from time to time amended) which have been re-enacted (with or without
        modification) or replaced (directly or indirectly) by such provision and
        shall further include all statutory instruments or orders from time to
        time made pursuant thereto.

1.3     In this Agreement and its Schedules:

        1.3.1   the neuter gender shall include the masculine and the feminine;

        1.3.2   the singular number shall include the plural and vice versa;

        1.3.3   the headings are inserted for convenience only and shall not
                affect the construction or interpretation of this Agreement; and
   
        1.3.4   references to Recitals, Clauses and Schedules and sub-divisions
                thereof, unless a contrary intention appears, are to the
                Recitals and Clauses of and Schedules to this Agreement and
                sub-divisions thereof respectively.

1.4     The Schedules form part of this Agreement and shall be construed and
        shall have the same full force and effect as if expressly set out in the
        body of this Agreement.

                                                                          Page 5
<PAGE>   9


ESTABLISHMENT OF THE COMPANY

2.1     Forthwith upon the execution of this Agreement each of the Original
        Shareholders shall itself take or (as appropriate) shall cause to be
        taken at directors' meetings and shareholders meetings of the Company
        the following steps in the following order:-

        2.1.1   the increase of the authorised share capital of the Company to
                Pound Sterling2,311,000 by the creation of 1,200,000 Ordinary
                Shares of Pound Sterling1 each

        2.1.2   the adoption by the Company of new Articles of Association in
                the Agreed Terms;

        2.1.3   the appointment of David Rand and (on a temporary basis) Paul
                Steiner, each as an `A' Director of the Company who shall be
                deemed so appointed pursuant to the Articles;

        2.1.4   the redesignation of Mr. Dobbie and Mr. MacSween as `B'
                Directors of the Company who shall be deemed so appointed
                pursuant to the Articles;

        2.1.5   the redesignation of the existing issued Ordinary Shares in the
                capital of the Company registered in the name of Mr Dobbie as
                `B' Shares and the redesignation of the existing issued Ordinary
                Shares in the capital of the Company registered in the name of
                Mr MacSween as `B' Shares and the conversion and redesignation
                of 1,600,000 of the remaining unissued shares as `A' Shares and
                the balance of 111,000 of the unissued Shares as `C' Shares in
                each case having the rights set out in the Articles;

        2.1.6   Inc shall deliver to the Board an application for the allotment
                and issue to it at a subscription price of Pound Sterling [*]
                per share of 133,334 `A' Shares accompanied by payment in full
                in cash of the subscription moneys of Pound Sterling [*];

        2.1.7   the parties shall procure that a Board Meeting of the Company is
                held at which the application referred to in Clause 2.1.6 shall
                be approved and the shares applied for shall be allotted and
                issued to Inc in accordance with its application;

        2.1.8   Inc and the Company shall enter into the Licence Agreement;

        2.1.9   Mr. Dobbie and the Company shall enter into the Dobbie Service
                Agreement; and

*Certain information on this page has been omitted and filed
 separately with the Commission. Confidential treatment has 
 been requested with respect to the omitted portions.


                                                                          Page 6

<PAGE>   10

        2.1.10  Mr. MacSween and the Company shall enter into the MacSween
                Service Agreement.

2.2     The Original Shareholders shall in good faith seek to refine and
        finalise the Draft Business Plan and to agree the form of the Business
        Plan as soon as practicable following the Effective Date and in any
        event by 30 April 1999. Within 30 days of such agreement, (subject to
        each of the Founders having complied with Clause 15.1 and provided that
        (i) neither the Company nor the Founders are in material breach of this
        Agreement and (ii) the Company is not in material breach of the Licence
        Agreement) Inc shall apply or procure applications from third parties
        for an additional 266,666 `A' Shares at a subscription price of Pound
        Sterling4.50 per share payable in full in cash on subscription. The
        parties shall procure that a Board Meeting of the Company is held within
        seven days of such application(s) at which such application(s) are
        approved and the shares applied for shall be allotted and issued to the
        applicant(s) in accordance with their respective applications.

2.3     The subscription moneys in respect of the application(s) referred to in
        Clause 2.2 (namely Pound Sterling1,199,997) shall be credited to a
        separate interest bearing bank account in the name of the Company ("the
        Retention Account"), which account shall be opened by the Company as
        soon as practicable following the Effective Date. No cheques may be
        drawn on or amounts withdrawn from the Retention Account except in
        accordance with Clause 11.3


3.      WARRANTIES BY FOUNDERS

3.1     The Founders jointly and severally warrant and represent to Inc that no
        charge, lien or other encumbrance exists or will be created over any
        interest in all or any of the Shares held by them or either of them
        (without the prior written consent of Inc acting reasonably provided
        that such consent may be withheld or given or given subject to
        reasonable conditions, as Inc may acting reasonably deem fit);


4.      OBJECTIVES OF THE COMPANY

4.1     Each of the Shareholders undertakes with the others to use all
        reasonable endeavours to procure (so far as it is able to do) that the
        activities of the Company shall be limited to the Business.
                                                                          Page 7
<PAGE>   11

4.2     Each of the Shareholders undertakes with the others that it will use all
        reasonable endeavours to procure that the Company shall conduct the
        Business on sound commercial profit making principles so as to generate
        the maximum achievable revenues.

4.3     Each of the Shareholders further undertakes that it will use its best
        endeavours to promote the Business and the interests of the Company
        Provided that this Clause 4.3 shall not apply to Inc or any Affiliate of
        Inc at any time after the Licence Agreement has terminated or any of the
        rights granted thereunder to the Company have ceased to be exclusive.


5.      DIRECTORS AND CHAIRMAN

5.1     The maximum number of Directors holding office at any time shall be 
        seven.

5.2     Unless and until otherwise agreed between the Shareholders, Inc shall
        have the right (but not the obligation) to appoint and maintain in
        office from time to time up to two `A' Directors (or if and for so long
        as there are more `A' Shares in issue than `B' Shares in issue, up to
        three `A' Directors) and the persons holding not less than 75% in
        nominal value of the `B' Shares shall have the right to appoint and
        maintain in office from time to time up to three `B' Directors (or if
        and for so long as there are more `A' Shares in issue than `B' Shares in
        issue, up to two `B' Directors) and each shall have the right to remove
        any director so appointed by it and to appoint another in his place
        (such appointment and removal to be effected by notice in writing to the
        Company).

5.3     In addition, the `A' Directors (if any) and the `B' Directors may by
        notice to the Company together appoint up to two more persons with
        relevant industry experience (and who are approved by all of them or if
        there is no `A' Director, by the `B' Directors and Inc) as additional
        directors. Any person so appointed may be removed and another appointed
        in his place (such appointment and removal to be effected by notice in
        writing to the Company signed by the `A' Directors and the `B' Directors
        or, if there is no `A' Director, by the `B' Directors and someone duly
        authorised on behalf of Inc).

5.4     The Chairman at any meeting of the Board shall not be entitled to a
        second or casting vote nor shall the Chairman have a second or casting
        vote in the case of an equality of votes at any general meeting of the
        Company.

                                                                          Page 8
<PAGE>   12

5.5     If Inc does not exercise its right to maintain an `A' Director in
        office, it shall nonetheless be entitled from time to time to appoint a
        person to attend at meetings of the Directors as an observer and any
        person so appointed ("an Observer") shall be given (at the same time as
        the Directors) notice of all meetings of the Directors and all agendas,
        minutes and other papers relating to such meetings.

5.6     An Observer shall be entitled to attend any and all meetings of the
        Directors and to speak and place items on the agenda for discussion
        provided that an Observer shall not be entitled in any circumstances to
        vote. Inc may remove an Observer appointed by it and appoint another
        person in his place. Any such appointment and removal shall be effected
        by notice in writing to the Company signed by someone duly authorised on
        behalf of Inc.


6.      BOARD MEETINGS

6.1     The Shareholders shall procure that at all times during the continuance
        of this Agreement meetings of the Board of the Company shall unless
        otherwise agreed between the Shareholders be held at regular intervals
        (and in any event not less frequently than once every quarter) and shall
        be convened on not less than 30 days notice in writing to the Directors
        and (if at any time there is no `A' Director) Inc accompanied by an
        agenda specifying the business to be transacted.

6.2     With effect from 1 April 1999 the quorum necessary for the transaction
        of the business of the Directors shall be two if no `A' Director is
        appointed and three if an `A' Director has been appointed of whom
        throughout the meeting one shall be an "A" Director (if any is
        appointed) and one a "B" Director (a "Board Quorum"). A person who holds
        office only as an alternate director shall, if his appointor is not
        present, be counted in the quorum. Prior to 1 April 1999 a Board Quorum
        shall comprise any two Directors.

6.3     If a Board Quorum is not present within half an hour from the time
        appointed for the meeting, or if during the meeting a Board Quorum
        ceases to be present, the meeting shall stand adjourned to the day 30
        days following the date appointed for the meeting at the same time and
        place or to such other time and place as the Directors may determine
        (such adjourned meeting being called the "First Adjourned Meeting").

6.4     If a Board Quorum is not present within half an hour from the time
        appointed for the First Adjourned Meeting, or if during the First
        Adjourned Meeting a Board Quorum 

                                                                          Page 9
<PAGE>   13

        ceases to be present, the First Adjourned Meeting shall stand adjourned
        to the same day in the next week at the same time and place or to such
        other time and place as the Directors may determine (such further
        adjourned meeting being called the "Second Adjourned Meeting")

6.5     If a Board Quorum is not present within half an hour from the time
        appointed for the Second Adjourned Meeting, or if during the Second
        Adjourned Meeting a Board Quorum ceases to be present the Directors
        present shall be a quorum.


7.      SECRETARY

7.1     Mr MacSween (or such other person as may from time to time be determined
        by the Board) shall act as the Secretary of the Company.


8.      REGISTERED OFFICE

8.1     The registered office of the Company shall be 63 Queen Victoria Street,
        London EC4 or such other place in England as may from time to time be
        determined by the Board and approved in writing by Inc.


9.      AUDITORS

9.1     The auditors of the Company shall be Deliotte & Touche or such other
        firm of Chartered Accountants of international standing and reputation
        as may from time to time be the auditors of (or the United Kingdom
        associate of the auditors of) Inc.


10.     ACCOUNTING REFERENCE DATE

10.1    The accounting reference date of the Company for the purpose of Section
        224 of the UK Companies Act 1985 shall be 30 June or such other date as
        may from time to time be determined by the Board and approved in writing
        by Inc.


11.     BANKERS

11.1    The Company shall maintain bank accounts with Clydesdale Bank plc and/or
        such other bank or banks as may from time to time be determined by the
        Board and approved in writing by Inc.

                                                                         Page 10
<PAGE>   14

11.2    The Shareholders shall procure that all cheques drawn by the Company and
        other withdrawals from the said accounts shall be signed or otherwise
        authorised in accordance with the bank mandate from time to time
        approved by Inc and the Board.

11.3    The Shareholders shall procure that save as Inc may otherwise agree in
        writing from time to time, no cheques shall be drawn by the Company on
        or other withdrawal made from the Retention Account:

        11.3.1  save for expenditure and investments as envisaged in the
                Business Plan; and

        11.3.2  unless the same shall be signed or otherwise authorised by Mr.
                Dave Larsen (or such other person as Inc may from time to time
                nominate for the purpose by notice in writing to the Company).


12.     COMPANY BOOKS RECORDS AND ACCOUNTS

12.1    The Shareholders shall procure that the Company shall keep such books
        records and accounts in connection with its business and shall provide
        such financial trading or other information regarding the affairs of the
        Company as the Shareholders shall from time to time require and without
        prejudice to the foregoing shall procure that the Company shall at all
        times comply with the provisions of the UK Companies Acts 1985 and 1989
        (or any statutory modification or re-enactment thereof) provided that
        each of the Shareholders shall have the right at its own cost to call
        for examine and inspect at all reasonable times the books records and
        accounts of the Company and may appoint or authorise any Person to make
        such examination and inspection on their behalf.

12.2    Notwithstanding the generality of Clause 12.1 the Shareholders shall
        procure that the Company prepares and makes available to each of them:

        12.2.1     quarterly financial statements within 15 days of the end of
                   the relevant quarter prepared in accordance with US GAAP;

        12.2.2     profit forecasts cashflow forecasts and budgets for each
                   Financial Year prior to the commencement of each such
                   Financial Year.

        12.2.3     audited annual financial statements within 30 days of the end
                   of the relevant Financial Year prepared in accordance with US
                   GAAP

                                                                         Page 11
<PAGE>   15

         Provided that Inc shall reimburse to the Company the reasonable
         additional cost to the Company of having any quarterly or annual
         financial statements, initially prepared for the purposes of this
         Clause 12.2 in accordance with UK accounting principles and practices,
         brought into compliance with US GAAP.

12.3     The Shareholders shall use all reasonable endeavours to procure that
         within six (6) months of the end of each Financial Year of the Company:

        12.3.1     the auditors of the Company shall prepare and deliver proper
                   audited accounts in accordance with statutory requirements
                   together with the auditors statutory report in respect of
                   such Financial Year; and

        12.3.2     that such audited accounts and auditors' report shall be laid
                   before the Company together with the directors' report
                   thereon for approval by the members of the Company in general
                   meeting.


13.     OPERATION OF THE COMPANY

13.1    Each of the Shareholders covenants with the others that it shall
        exercise all voting rights and other powers of control available to it
        in relation to the Company so as to procure (insofar as it is able by
        the exercise of such voting rights and powers) and the Company, to the
        extent permitted by law, covenants with the Shareholders that the
        Company shall not without the prior written consent of both Inc and both
        of the Founders (such consent not to be unreasonably withheld or delayed
        by any of them):-

        13.1.1  make any alteration or variation whatsoever to its Memorandum or
                Articles of Association; or

        13.1.2  cease or threaten to cease to carry on its business; or

        13.1.3  make any material change in the nature of its business or
                commence any new type of business; or

        13.1.4  borrow any monies in excess of the amounts provided for in the
                Business Plan in respect of the first Financial Year ending 30
                June 2000 and thereafter in the annual budget produced under
                Clause 12.2 and approved by both Inc and the Founders; or


                                                                         Page 12
<PAGE>   16

        13.1.5     create any mortgage charge or lien (other than a lien arising
                   by operation of law) over or otherwise use as security its
                   undertaking property or assets or any part thereof or any
                   interest therein (including goodwill and uncalled capital);
                   or

        13.1.6     enter into any guarantee or indemnity or stand surety for the
                   obligations of any third party or enter into any agreement
                   for the same for an aggregate amount in excess of the amounts
                   provided for in the Business Plan in respect of the first
                   Financial Year ending 30 June 2000 and thereafter in the
                   annual budget produced under Clause 12.2 and approved by both
                   Inc and the Founders; or

        13.1.7     make any loan or advance or (except in the ordinary course of
                   business) grant any credit to any person; or

        13.1.8     sell transfer lease assign or otherwise dispose of any real
                   property, whether freehold or leasehold, or of the whole or a
                   material part of its undertaking property or assets (or
                   interest therein) or contract so to do;

        13.1.9     enter into any contract arrangement or commitment involving
                   expenditure on capital account (in excess of the amounts
                   provided for in the Business Plan in respect of the first
                   Financial Year of the Company ending 30 June 2000 and
                   thereafter in the annual budget produced under Clause 12.2
                   and approved by both Inc and the Founders) or the realisation
                   of capital assets; or

        13.1.10    engage any senior employee on a compensation package in
                   excess of that provided for in the Business Plan in respect
                   of the first Financial Year ending 30 June 2000 and
                   thereafter in the annual budget produced under Clause 12.2
                   and approved by both Inc and the Founders; or

        13.1.11    take or agree to take any freehold or leasehold interest in
                   or licence over any land; or

        13.1.12    (without prejudice to the generality of Clause 13.1.27) enter
                   into any transaction arrangement or agreement with or for the
                   benefit of any Director (except for the Dobbie Service
                   Agreement and MacSween Service Agreement); or

                                                                         Page 13
<PAGE>   17

        13.1.13    acquire any material asset (or receive any material service)
                   at more than market value or dispose of any material asset
                   (or give any material service) at less than market value; or

        13.1.14    acquire or create or dispose of any interest in any
                   Subsidiary or acquire the undertaking or assets or any
                   substantial part of the business of any Person; or

        13.1.15    appoint or remove any Director or the chairman of the Company
                   (except as provided for hereunder or as permitted under the
                   Articles); or

        13.1.16    initiate any litigation or arbitration other than in the
                   ordinary course of business or settle or compromise any
                   claims, litigation or arbitration (other than monetary
                   settlements or compromises involving payments to or by the
                   Company of less than US $50,000 in aggregate in any one
                   Financial Year); or

        13.1.17    permit any transfer of Shares in the Company except in
                   accordance with this Agreement and the Articles of
                   Association for the time being; or

        13.1.18    pay any fees or make any other payments (other than
                   emoluments due by reason of their employment) to any
                   Directors; or

        13.1.19    allot or issue any unissued shares for the time being or
                   create or issue any new shares; or

        13.1.20    alter any rights attaching to any class of share in the 
                   capital of the Company; or

        13.1.21    consolidate, sub-divide or convert the Company's share
                   capital or in any way alter the rights attaching thereto; or

        13.1.22    enter into any partnership or (other than in the ordinary
                   course of business) profit sharing agreement with any Person;
                   or

        13.1.23    do or permit or suffer to be done any act or thing whereby
                   the Company may be wound up (whether voluntarily or
                   compulsorily), save as otherwise expressly provided for in
                   this Agreement; or

                                                                         Page 14
<PAGE>   18

        13.1.24 issue any debentures or debenture stock or other securities
                convertible into shares or debentures or any share warrants or
                any options in respect of shares; or

        13.1.25 enter into any contract or transaction except in the ordinary
                and proper course of the Business and on arm's length terms; or

        13.1.26 acquire, purchase or subscribe for any shares, debentures,
                mortgages or securities (or any interest therein) in any
                company, trust or other body; or

        13.1.27 save as specifically provided in the Licence Agreement, the
                Dobbie Service Agreement and/or the MacSween Service Agreement
                or in the Business Plan in respect of the first Financial Year
                ending 30 June 2000 and thereafter in the annual budget produced
                under Clause 12.2 and approved by both the Founders and Inc
                create any contract with or obligation to pay money or money's
                worth in excess of US $20,000 in any one Financial Year to any
                Founder or to any Shareholder or to any Affiliate of such
                Founder or Shareholder or to any Person as a nominee or
                associate of any such Founder or Shareholder or Affiliate
                (including any renewal thereof or any variation in the terms of
                any existing contract or obligation); or

        13.1.28 appoint any committee of the Board or any local board or
                delegate any of the powers of the Directors to such committee or
                local board; or

        13.1.29 merge or amalgamate with any other company or undertaking; or

        13.1.30 enter into any compromise or arrangement to which Section 425 of
                the UK Companies Act 1985 applies; or

        13.1.31 change the accounting policies of the Company save as required
                to comply with UK GAAP; or

        13.1.32 capitalise or repay any amount standing to the credit of any
                reserve of the Company or redeem or purchase any shares of the
                Company or otherwise reorganise the share capital of the
                Company; or

        13.1.33 surrender to any Founder or Shareholder or to any Affiliate of
                such Founder or Shareholder any loss, relief, allowance,
                exemption, set-off, 


                                                                         Page 15
<PAGE>   19

        deduction or credit in computing or against income, profits, gains or
        taxation or any right to a repayment of taxation.

13.2    Notwithstanding anything contained in this Agreement Inc hereby consents
        to the issue and allotment of new shares in the Company at the time of
        and in connection with a Flotation (as defined in Clause 23.10) to which
        Clause 23.9 applies.

13.3    The Founders undertakes with Inc that, notwithstanding any voting rights
        or powers or control otherwise available to them, they will permit Inc
        to conduct negotiations in connection with and enforce in each case on
        behalf of or in the name of the Company all and any rights arising or
        enforceable against:

        13.3.1 Mr. Dobbie under the Dobbie Service Agreement and/or Mr. MacSween
               under the MacSween Service Agreement and in particular but
               without limitation to the generality of the foregoing Inc shall
               be solely responsible for reviewing the Founders' salaries and
               approving any increases thereof; and/or

        13.3.2 Iomart Limited under the letter of today's date from Iomart
               Limited to the Company.

13.4    Inc undertakes with the Founders that, notwithstanding any voting rights
        or powers or control otherwise available to it, it will permit the
        Founders to conduct negotiations in connection with and enforce on
        behalf of or in the name of the Company all and any rights arising or
        enforceable against Inc under the Licence Agreement.


14.     KEY EMPLOYEES

        Each of the Founders and the Shareholders covenants with the others that
        it shall exercise all voting rights and other powers of control
        available to it in relation to the Company so as to procure (insofar as
        it is able by the exercise of such voting rights and powers) and the
        Company covenants with the Shareholders that the Company and each Key
        Employee shall enter into a Key Employee Agreement at the same time as
        or before that Key Employee commences employment with the Company.


15.     INSURANCE OBLIGATIONS

15.1    As soon as practicable after Completion and in any event no later than
        30 April 1999 the Founders will obtain up to date medical reports the
        scope of each of which is satisfactory to Inc in all material respects
        (including findings, range of report and 

                                                                         Page 16
<PAGE>   20

        qualification of reporter). If both the Founders shall have failed to
        comply with this Clause 15.1 by 30 April 1999 (or such later date as Inc
        may in writing agree) then the Company shall be wound up as soon as
        practicable.

15.2    Each of the Founders and the Shareholders covenants with the others that
        it shall exercise all voting rights and other powers of control
        available to it in relation to the Company so as to procure (insofar as
        it is able by the exercise of such voting rights and powers) and the
        Company covenants with the Shareholders that the Company shall at its
        own expense within one month of the Effective Date:

        15.2.1  effect and maintain for its own benefit, key man five year term
                and disability insurance with an insurance company of good
                repute on the lives of each of the Founders (who will co-operate
                fully in all respects in relation thereto) in the sum of not
                less than US $1 million each; and

        15.2.2  effect and maintain for the benefit of each Director, other
                officer or auditor of the Company in respect of any liability
                which may attach to him or loss or expenditure which he may
                incur in relation to anything done or alleged to have been done
                or omitted to be done as a Director, officer or auditor in such
                amount as the Board considers reasonable.


16.     EMPLOYEE SHARE OPTION SCHEME(S)

16.1    Notwithstanding anything else in this Agreement the Shareholders hereby
        consent to the creation and implementation of one or more Employee Share
        Option Schemes whereby senior employees of the Company may be granted
        options to acquire in aggregate not more than 111,000 `C' Shares (or
        such greater number as Inc and the Founders may agree in writing from
        time to time) (being part of the authorised but unissued share capital
        of the Company at the date hereof) on terms that the exercise price per
        Share in respect of any such option shall be the fair market value of a
        share on the date of grant of the option and otherwise on such terms as
        the Original Shareholders may approve Provided that no option may be
        granted to an employee or consultant before his engagement with the
        Company begins. The grant of any such option shall require the unanimous
        approval of the Board (such approval not to be unreasonably withheld).

16.2    It is the intention of the Shareholders that (subject to the
        Shareholders being satisfied with relevant accounting, tax and legal
        requirements and until such time as any 


                                                                         Page 17
<PAGE>   21

        Person acquires a Controlling Interest in Inc) Inc will grant options to
        purchase Inc Common Stock to senior employees of the Company during the
        Financial Year of the Company ending on the dates referred to in column
        (A) below in respect of up to the aggregate numbers of shares of Inc set
        opposite those dates in column (B) below:
<TABLE>
<CAPTION>
              (A)                                           (B)
        Financial Year ending:                      Nos. of Inc. shares*
        ---------------------                       --------------------
<S>                                                  <C>   
           30.06.00                                         15,000
           30.06.01                                         20,000
           30.06.02                                         25,000
           30.06.03                                         40,000
</TABLE>

           *The numbers of shares and/or subscription price therefor shall be
           adjusted in such manner as Inc's auditors confirm to be fair and
           reasonable in the event of any stock splits, stock dividends,
           combinations, recapitalisations or like changes in the outstanding
           capital stock of Inc.

        The grant of options shall be dependent upon the audited financial
        statement of the Company demonstrating the Company's achievement of
        revenue, net income and EBITDA targets specified in the Business Plan,
        as modified from time to time with the written approval of Inc. The
        price per share at which an option may be exercised will be the fair
        market value of an Inc share at the date when the option is issued. Each
        option granted will be subject to such terms as the Original
        Shareholders approve.

        It shall be a term of any option that if any Person acquires a
        Controlling Interest in Inc in a transaction in which employee options
        are assumed or options of the acquiror are substituted for outstanding
        employee options, Inc shall have the right to require the optionholder
        to release his option in Inc ("the Old Option") on the grant to him of
        an option in the acquiring company which is equivalent to the Old
        Option.


17.     DUE ADMINISTRATION OF THE COMPANY

17.1    Each of the Shareholders undertakes with the others and the Company
        undertakes with each Shareholder that (except as the Shareholders may
        otherwise agree in writing) it will at all times exercise all voting
        rights and powers of control available to it in relation to the Company
        so as to give full effect to the terms and conditions of this Agreement
        including, where appropriate, the carrying into effect of such terms as
        if they were embodied in the Company's Memorandum and Articles of
        Association.


                                                                         Page 18
<PAGE>   22

18.     GLOBAL TECHNICAL COMMITTEE

18.1    Inc shall establish a global technical committee ("the Technical
        Committee") comprising one suitably qualified and experienced delegate
        nominated by each of Inc, the Company and the other companies in which
        Inc directly or indirectly shall have an interest and which shall be
        formed in territories outside the Territory (as defined in the Licence
        Agreement), whose respective businesses shall be the establishment of
        Internet Co-location Centres and Internet Service Exchanges in those
        other territories (the Business and such other businesses being herein
        called the "Relevant Businesses").

18.2    The role of the Technical Committee shall be to consider all technical
        matters pertaining to the smooth running and efficient operation of the
        Relevant Businesses and to recommend to Inc ways in which the same might
        be improved.

18.3    Inc shall consider the proper and reasonable recommendations of the
        Technical Committee in good faith.

18.4    The Technical Committee shall meet quarterly at such locations as Inc
        shall from time to time decide. Inc shall meet the reasonable travel and
        accommodation expenses of the delegates in travelling to and from and
        attending at such meetings.


19.     TRANSFER OF SHARES

19.1    Each of the Shareholders agrees with the others that the transfer of any
        of its Shares shall be restricted in accordance with the provisions of
        the Articles and (where applicable) in accordance with the terms of this
        Agreement.

19.2    A Share may be transferred otherwise than in accordance with this
        Agreement and/or the Articles only where and insofar as the holders
        (including the proposing transferor) for the time being holding not less
        than 90 per cent of the Shares then in issue consent in writing to the
        transfer of that Share.

19.3    Provided that Inc's shareholding does not drop below 13% of the Equity
        Share Capital in the case of one or more transfers pursuant to Clauses
        19.3.2 or 19.3.3 (save for the avoidance of doubt the immediately
        foregoing proviso shall not apply to any transfer(s) made pursuant to
        Clause 19.3.1) Inc may transfer:

                                                                         Page 19
<PAGE>   23

        19.3.1    subject to the provisions of Clause 29.2 any Share held by it
                  to any Person who acquires a Controlling Interest in or
                  purchases all or substantially all of the assets of Inc or to
                  an Affiliate of such Person; provided that simultaneously
                  therewith such Person (or an Affiliate of such Person) accepts
                  an assignment of the benefit and burden of the Licence
                  Agreement; or

        19.3.2    at any time on or before 31 December 1999 any Share comprised
                  in Inc's Original Holding at a price no greater than the price
                  at which the Share was originally subscribed without
                  restriction to any venture capital fund or financial
                  institution which, in either case, is a shareholder in Inc; or

        19.3.3    at any time on or before 31 December 1999 any Share comprised
                  in Inc's Original Holding at a price no greater than the price
                  at which the Share was originally subscribed to any other
                  venture capital fund or financial institution with the prior
                  written approval of the Founders (such approval not to be
                  unreasonably withheld or delayed in the case of a venture
                  capital fund or financial institution of good standing and
                  repute).

19.4    The provisions of Clauses 19.5, 19.6, 19.7 and 19.8 shall apply if at
        any time a Person ("the Offeror") shall make a bona fide offer which if
        accepted would result in the Offeror (and/or an Affiliate of the
        Offeror) acquiring a Controlling Interest in the Company.

19.5    The parties to whom the offer is addressed (herein "the Proposing
        Transferors") severally covenant with Inc that they will not at any time
        accept the offer from the Offeror in respect of any of their shares in
        the Company unless the offer extends to all the Proposing Transferors'
        shares in the Company and unless the Proposing Transferors shall first
        have procured in favour of Inc a bona fide offer (herein an "Exit
        Offer") from the Offeror to acquire all of the shares held by Inc in the
        Company at a price per Ordinary Share no less (and otherwise on terms no
        less favourable) than that payable for each Ordinary Share being sold by
        the Proposing Transferors and at a price per share other than an
        Ordinary Share of no less than par value and the Proposing Transferors
        shall not dispose of any interest in any share in the Company held by
        them (other than as aforesaid) unless:-

        19.5.1     an Exit Offer shall first have been made and communicated to
                   Inc, which Exit Offer shall be irrevocable for a period of
                   not less than twenty-eight 

                                                                         Page 20
<PAGE>   24

                   (28) days from the date it is made ("the Offer Period")
                   and shall state the identity of the Offeror and the
                   terms upon which and the price at which the Offeror is
                   prepared to acquire the shares in the Company held by
                   Inc; and

        19.5.2     either:-

                   (i)    Inc shall within the Offer Period have accepted the
                          Exit Offer or negotiated alternative terms mutually
                          acceptable to it and the Offeror; or

                   (ii)   Inc shall within the Offer Period have offered to
                          purchase all the shares of the Proposing Transferors
                          in the Company at a price per share no less (and
                          otherwise on terms no less favourable save as provided
                          in Clause 19.10) than that offered by the Offeror
                          under the terms of the Exit Offer; or

                   (iii)  Inc shall have rejected the Exit Offer and for this
                          purpose the Exit Offer shall be deemed to have been
                          rejected if (aa) Inc has not accepted it within the
                          Offer Period as provided in Clause 19.5.2 (i) or (bb)
                          Inc has not offered to purchase all the shares of the
                          Proposing Transferors as provided in Clause 19.5.2
                          (ii) within the Offer Period.

19.6    If an Exit Offer, having been made on the basis prescribed by Clause
        19.5, is accepted pursuant to Clause 19.5.2 (i) the Proposing
        Transferors and Inc shall be at liberty for a period of up to sixty (60)
        days from the date of acceptance to sell all (but not part only) of
        their shares in the Company to the Offeror conditionally upon the
        Offeror also buying at the same time all of the shares of Inc in the
        Company, such sales in each case to be on the terms of the Exit Offer or
        such other terms as may be mutually acceptable to all of the Offeror,
        the Proposing Transferors and Inc. So far as is practicable, it shall be
        a term of the Exit Offer that completion of the sale of the shares of
        the Proposing Transferors in the Company shall take place
        contemporaneously with completion of the sale of the shares of Inc in
        the Company and that the consideration payable in respect of both such
        sales shall be satisfied in the same manner and paid at the same time or
        times.

19.7    If, an Exit Offer having been made on the basis prescribed by Clause
        19.5, subject to Clause 19.10, Inc in accordance with Clause 19.5.2 (ii)
        shall within the Offer Period 

                                                                         Page 21
<PAGE>   25

        offer to purchase all the shares of the Proposing Transferors in the
        Company at a price per share no less (and otherwise on terms no less
        favourable) than that offered by the Offeror under the terms of the Exit
        Offer, then within 45 days after the expiry of the Offer Period

        o    if the consideration offered by Inc consists wholly or partly of
             Common Shares of Inc, Inc and the proposing transferor shall
             enter into a Purchase Agreement in the Agreed Terms and

        o    in any event (subject to the said Purchase Agreement being entered
             into, if required) Inc shall (subject as provided in Clause
             19.15.1.2 and 19.15.2) complete the purchase and the Proposing
             Transferors shall complete the sale of all (but not some only) of
             the Proposing Transferors' shares in the Company at such price
             and on such terms (such completion being herein called
             "Completion"). Such Shares shall be sold with full title
             guarantee and free from all liens, charges and encumbrances and
             with all rights attaching to them with effect from the date of
             Completion.

19.8    If an Exit Offer, having been made on the basis prescribed by Clause
        19.5, is rejected or is deemed to have been rejected by Inc pursuant to
        Clause 19.5.2 (iii), the Proposing Transferors shall be at liberty for a
        period of up to sixty (60) days from the date of rejection of the Exit
        Offer or expiry of the Offer Period (as appropriate) to sell all (but
        not part only) of their shares in the Company to the Offeror on the
        terms of the Exit Offer (but not otherwise).

19.9    If the consideration payable by the Offeror shall consist in whole or
        part of something other than cash and/or marketable securities whose
        value on a given day is readily ascertainable, then the value of such
        other consideration ("the Other Consideration") shall be such value as
        Inc and the Company shall agree. In the event of disagreement, the
        determination of the value of the Other Consideration shall be referred
        to an umpire (acting as expert and not as arbitrator) nominated by and
        acting at the joint expense of the parties concerned (or, in the event
        of disagreement as to nomination, appointed by the President for the
        time being of the Institute of Chartered Accountants in England and
        Wales at the request of either Inc or the Company) whose decision shall
        be final and binding.

19.10   The consideration offered by Inc pursuant to Clause 19.5.2 (ii) may (at
        Inc's election) consist wholly of cash or wholly of Common Shares of Inc
        or partly of one and partly 


                                                                         Page 22
<PAGE>   26

        of the other Provided that Inc's Common Stock is then traded on the
        NASDAQ National Market or listed on a major US Securities Exchange. If
        Inc's Common Stock is not then traded on the NASDAQ National Market or
        listed on a major US Securities Exchange the consideration shall be
        cash.

19.11   If the Common Shares offered by way of consideration (the "Consideration
        Shares") are not registered with the SEC prior to the Completion, Inc
        shall within 30 days after the date of Completion, file with the SEC a
        registration statement under the Securities Act of 1933, as amended, of
        the United States (the "Securities Act") covering the resale to the
        public by the shareholders of the Consideration Shares (the
        "Registration Statement"). Inc shall use reasonable efforts to cause the
        Registration Statement to be declared effective by the SEC as soon as
        practicable. Inc shall use its best efforts to cause the Registration
        Statement to remain effective until the earlier of (i) 120 days from the
        effective date of the Registration Statement (the "Selling Period") or
        (ii) such time as all of the Consideration Shares covered by the
        Registration Statement have been sold pursuant thereto.

19.12   Notwithstanding the foregoing:

        19.12.1 Inc may, at any time, delay the filing or effectiveness of the
                Registration Statement or suspend the Registration Statement
                after effectiveness and may further, by written notice to the
                Shareholders, require the Shareholders immediately to cease
                sales of the Consideration Shares during the Selling Period if,
                and for so long as, Inc determines acting reasonably that the
                existence of any fact or the happening of any event (including
                without limitation pending negotiations relating to, or the
                consummation of, a transaction or the occurrence of any other
                event) would require additional disclosure of material
                information by Inc in the Registration Statement the
                confidentiality of which it has a valid business purpose to
                preserve or which fact or event would render Inc unable to
                comply with SEC requirements (in either case, a "Suspension
                Event").

        19.12.2 If Inc delays or suspends the Registration Statement or requires
                any Shareholder to cease sales of shares pursuant to Clause
                19.12.1, Inc shall, as promptly as practicable following the
                termination of the circumstance which entitled Inc to do so
                ("the Reinstatement Period"), take such actions as may be
                necessary to file or reinstate the 


                                                                         Page 23
<PAGE>   27

                effectiveness of the Registration Statement and/or give written
                notice to the Shareholder concerned authorising that Shareholder
                to resume sales pursuant to the Registration Statement. If as a
                result thereof the prospectus included in the Registration
                Statement has been amended to comply with the requirements of
                the Securities Act Inc shall enclose such revised prospectus
                with the notice to Shareholders given pursuant to this Clause
                19.12.2, and Shareholders shall make no offers or sales of
                shares pursuant to the Registration Statement other than by
                means of such revised prospectus.

        19.12.3 In the case of any Suspension Event occurring to and delaying
                the filing of the Registration Statement, Inc shall file the
                Registration Statement in accordance with Clause 19.12.2 and
                shall be required to keep the Registration Statement effective
                until the earlier of (i) such time as all the Common Shares
                offered thereby have been disposed of in accordance with the
                intended methods of distribution set forth in the Registration
                Statement or (ii) 120 days plus an extended period equal to the
                number of days during which any such suspension was in effect.

19.13   Where Clause 19.11 applies:

        19.13.1 In connection with the filing by Inc of the Registration
                Statement, Inc shall furnish to the Shareholders copies of the
                prospectus, including a preliminary prospectus, in conformity
                with the requirements of the Securities Act and such additional
                copies as are reasonably required by the Shareholders.

        19.13.2 Inc shall use its best efforts to register or qualify the
                Consideration Shares covered by the Registration Statement under
                the securities laws of such states as the Shareholders shall
                reasonably request; provided, however, that Inc shall not be
                required in connection with this Clause 19.13.2 to qualify as a
                foreign corporation or execute a general consent to service of
                process in any jurisdiction.

        19.13.3 If Inc has delivered final prospectuses to the Shareholders and
                after having done so the prospectus is amended to comply with
                the requirements of the Securities Act, Inc shall promptly
                notify the 


                                                                         Page 24
<PAGE>   28

                Shareholders and, if requested by Inc the Shareholders shall
                immediately cease making offers or sales of shares under the
                Registration Statement and return all prospectuses to Inc. Inc
                shall promptly provide the Shareholders with revised
                prospectuses and, following receipt of the revised prospectuses,
                the Shareholders shall be free to resume making offers and sales
                under the Registration Statement.

        19.13.4 Inc shall pay the expenses incurred by it in complying with its
                obligations under Clauses 19.11 to 19.14 inclusive, including
                all registration and filing fees, exchange listing fees, fees
                and expenses of counsel for Inc and fees and expenses of
                accountants for Inc but excluding (i) any brokerage fees,
                selling commissions or underwriting discounts incurred by the
                Shareholders in connection with sales under the Registration
                Statement and (ii) the fees and expenses of any counsel retained
                by the Shareholders.

19.14   Inc shall not be required to include any Consideration Shares in the
        Registration Statement unless each Shareholder furnishes to Inc in
        writing such information regarding the Shareholder and the proposed sale
        of Common Shares by the Shareholder as Inc may reasonably request in
        writing in connection with the Registration Statement or as shall be
        required in connection therewith by the SEC or any state securities law
        authorities.

        19.15.1 If Inc elects to offer a consideration consisting wholly or
                partly of Common Shares in Inc then:

        19.15.1.1 if the Consideration Shares are registered with the SEC prior
                  to Completion, the number of Consideration Shares to be issued
                  to satisfy the relevant element of the consideration ("the
                  Relevant Consideration") shall be determined by dividing the
                  amount of the Relevant Consideration by the value of one
                  Common Share (based upon the average closing price on NASDAQ
                  or a major US Securities Exchange of one Common Share over the
                  10 trading days ending three trading days prior to Completion)

        19.15.1.2 if the Consideration Shares are not registered with the SEC
                  prior to Completion then:

                                                                         Page 25
<PAGE>   29

                (i)     the number of Consideration Shares to be issued to
                        satisfy the Relevant Consideration shall be calculated
                        as provided in Clause 19.15.1.1, save that

                (ii)    if the closing price on NASDAQ or a major US Securities
                        Exchange of a Common Share on the day prior to the
                        registration statement becoming effective is less than
                        the average closing price on NASDAQ or a major US
                        Securities Exchange of one Common Share over the 10
                        trading days ending three trading days prior to
                        Completion, then Inc will provide the transferring
                        Shareholders with (at Inc's option) cash or additional
                        Common Shares sufficient to compensate them for such
                        decrease.

        19.15.2 If a Suspension Event occurs within the first 45 days after the
                Registration Statement becomes effective which delays the sale
                of the Consideration Shares and the value of a Consideration
                Share at the end of the Reinstatement Period (based upon the
                average closing price on NASDAQ or a major US Securities
                Exchange of one Common Share over the 10 trading days
                immediately prior to the end of the Reinstatement Period) is
                less than the value of a Consideration Share immediately prior
                to the Suspension Event (based upon the average closing price on
                NASDAQ or a major US Securities Exchange of one Common Share
                over the 10 trading days prior to the Suspension Event) then Inc
                will provide the transferring shareholders with (at Inc's
                option) cash or additional Common Shares sufficient to
                compensate them for such decrease.

19.16   At completion of the sale the transferring Party shall procure that the
        director(s) of the Company who are nominees of the transferring Party
        shall forthwith resign (without any claims for loss of office or
        otherwise).

19.17 The provisions of Clause 19.18 shall apply if:

        19.17.1 at any time the Founders and/or the Affiliates of either or both
                of them (the "Intending Transferors") receive from Inc a bona
                fide offer (the "Offer") in respect of any of their Shares in
                the Company; and

        19.17.2 the Intending Transferors together hold 50% or more of the
                Shares for the time being in issue and wish to accept such
                Offer; and

                                                                         Page 26
<PAGE>   30

        19.17.3    Inc also wishes to purchase the Shares in the Company other
                   than those of the Intending Transferors (the "Other Shares"
                   and the holders thereof are herein called the "Other
                   Shareholders") at a price per Share no less (and otherwise on
                   terms no less favourable) than that payable for each Share
                   being sold by the Intending Transferors.

19.18   Where this Clause 19.18 applies the Other Shareholders shall be deemed
        to have accepted the Offer on the day after such Offer is made.

19.19   If an Offer having been made on the basis prescribed by Clause 19.17 is
        deemed to be accepted pursuant to Clause 19.18 then the Intending
        Transferors and the Other Shareholders shall be at liberty for a period
        of up to 90 days from the date of the Offer to sell all (but not part
        only) of their shares in the Company to Inc conditionally upon Inc
        buying all of the shares in the Company, such sales to be on the terms
        of the Offer. So far as practicable, it shall be a term of the offer
        that completion of the sale of the shares of the Intending Transferors
        in the Company shall take place contemporaneously with the completion of
        the sale of the shares of the Other Shareholders. All such Shares shall
        be sold with full title guarantee and free from all liens, charges and
        encumbrances and with all rights attaching to them with effect from the
        date of completion of the sales.

19.20   If after becoming bound to transfer any of its Shares the transferring
        party makes default in transferring such Shares (or any of them) the
        Company may receive the purchase monies or other consideration and the
        transferring Party shall be deemed to have appointed one Director or the
        Secretary of the Company his or its agent to execute a transfer of the
        relevant Shares to the purchaser and upon execution of such transfer the
        Company shall hold the purchase monies or other consideration in trust
        for the transferring Party. The receipt of the Company for the purchase
        monies or other consideration shall be a good discharge for the
        purchaser and after his, its or their names has been entered in the
        register of members of the Company, the validity of the proceedings
        shall not be questioned by any Person.


20.     CHARGING OF SHARES

20.1    None of the Shareholders shall (except with the prior written consent of
        both of the Original Shareholders acting reasonably, provided that such
        consent may be withheld or given or given subject to such reasonable
        conditions, as either or both of the Original Shareholders may acting
        reasonably deem fit) create or permit to subsist 

                                                                         Page 27
<PAGE>   31

        any charge, lien or other encumbrance over any interest in all or any of
        the Shares held by it. It is agreed that either or both of the Original
        Shareholders may reasonably withhold consent if the proposed chargee,
        lien holder or other encumbrancer does not agree to be bound by this
        Agreement.


21.     FINANCE

21.1    The Founders jointly and severally undertake to use their best
        commercial endeavours to procure that plant and equipment required by
        the Company to carry on the Business having a list price of not less
        than Pound Sterling1,200,000 shall be leased by the Company from one or
        more independent third parties on commercial arms length terms.

22.2    The Company may from time to time prior to 31 December 1999 by notice in
        writing to Inc require Inc (subject only to Inc and the Founders
        agreeing the Conversion Basis, as defined in the Loan Note Instrument,
        in accordance with Clause 21.3 below) to subscribe for the nominal
        amount of Convertible Loan Notes specified in such notice. Any such
        notice shall be accompanied by a copy of the minute of the meeting of
        the Board at which the issue of the notice was approved. The total
        nominal amount of Convertible Loan Notes required by all such notices to
        be subscribed shall in no event exceed Pound Sterling1,200,000.

21.3    Within 21 days of the issue of a notice pursuant to Clause 21.2 Inc and
        the Founders shall seek in good faith to agree the Conversion Basis. For
        these purposes only, the value of the entire issued Equity Share Capital
        of the Company shall be treated as three times the expected revenues of
        the Company for the 12 months following the issue of the said notice, as
        agreed between Inc and the Founders. In the absence of agreement as to
        the applicable Conversion Basis, Inc shall not be obliged to subscribe
        for any Convertible Loan Notes.

21.4    Within 21 days of the Conversion Basis having been agreed (and provided
        always that (i) neither the Company, nor the Founders or any or all of
        the foregoing, are in material breach of this Agreement and (ii) the
        Company is not in material breach of the Licence Agreement and (iii) the
        Founders have procured that plant and equipment required by the Company
        to carry on the Business to a list price of not less than Pound
        Sterling1,200,000 has been leased by the Company from one or more third
        parties on commercial arms length terms and (iv) each of the Founders
        has complied with Clause 15.1) the Company shall duly execute the Loan
        Stock Instrument and Inc 


                                                                         Page 28
<PAGE>   32

        shall subscribe or procure that Permitted Third Parties subscribe in
        cash at par the nominal amount of the Convertible Loan Notes specified
        in the relevant notice. The minimum subscription by any single Permitted
        Third Party shall not be less than Pound Sterling300,000. For the
        purposes of this Clause 21.4, "Permitted Third Parties" means:

        (a)     any venture capital funds or financial institutions which, in
                either case, are Shareholders in Inc;

        (b)     any other venture capital funds or financial institutions which
                are approved in writing in advance by the Founders (such
                approval not to be unreasonably withheld or delayed in the case
                of a venture capital fund or financial institution of good
                standing and repute).

21.5    The Parties shall procure that the Company forthwith allots the
        Convertible Loan Notes subscribed in accordance with the previous
        provisions of this Clause and issues a certificate in respect thereof to
        the subscribers therefor forthwith upon receipt by the Company of
        payment in full for the Convertible Loan Notes subscribed by Inc.

21.6    In addition to or instead of issuing Convertible Loan Notes to Inc, the
        Company may by 31 December 1999 (or such later date as the Original
        Shareholders may agree in writing) raise capital from venture
        capitalists and/or financial institutions in any case of good standing
        and reputation who is/are acceptable to the Original Shareholders and on
        terms which are acceptable to the Original Shareholders. The
        Shareholders shall co-operate with such capital raising. Each of the
        Original Shareholders will have the right (but not the obligation) to
        subscribe part of such additional capital so as to ensure that the
        Ordinary Shares held by it immediately after such capital raising
        represents the same percentage of the issued Equity Share Capital that
        its Ordinary Shares represented immediately prior to such capital
        raising.

21.7    The Shareholders hereby agree for the avoidance of doubt that (save as
        expressly provided in Clause 21.4 in relation to Inc's obligation to
        subscribe or procure subscribers for Convertible Loan Notes) nothing in
        this Clause 21 shall be construed so as to require any of them to
        provide any further finance for the Company.

                                                                         Page 29
<PAGE>   33


2.      DIVIDEND POLICY

22.1    Unless Inc otherwise agrees in writing, the Company shall not make any
        distribution of profits in respect of the Financial Years ending 30 June
        2000, 30 June 2001 and 30 June 2002.

22.2    If in respect of any Financial Year ending on or after 30 June 2003 the
        Company shall have profits available for distribution (within the
        meaning of Part VIII of the Companies Act) then (unless the Shareholders
        otherwise agree in writing in respect of a particular Financial Year)
        the Shareholders shall procure that such profits shall be applied in the
        following manner and order of priority:

        (a)        the provision of working and fixed capital to finance the
                   continuing operations and growth of the Business and the
                   Company and transfers to reserves consistent with the normal
                   commercial requirements of businesses similar to those
                   carried on by the Company all in the amounts provided for in
                   the annual budget for the next succeeding Financial Year
                   produced under Clause 12.2 and approved by at least four
                   Directors;

        (b)        the payment (provided that all Convertible Loan Notes then
                   outstanding (i) have been repaid in full or (ii) have been
                   converted into `A' Shares or (iii) in the absence of such
                   repayment or conversion, Inc has given its prior written
                   consent to the same):

                   o       in respect of the Financial Years ending 30 June 2003
                           and 30 June 2004 of cash dividends of up to 25 per
                           cent of post-tax profits (or, if less up to 25 per
                           cent of accumulated distributable profits)

                   o       in respect of Financial Years ending on and after 30
                           June 2005 of cash dividends of up to 75 per cent of
                           the post-tax profits (or, if less, up to 75 per cent
                           of accumulated distributable profits).

                   After (in each case) adequate cash has been reserved to
                   provide for the items referred to in (a) above for the
                   succeeding Financial Year, all as determined and agreed by a
                   majority of the Directors and within seven (7) months after
                   the end of the Financial Year concerned.

22.3    In deciding whether in respect of any Financial Year the Company had or
        has profits available for distribution the Parties shall procure that
        the auditors of the Company 

                                                                         Page 30
<PAGE>   34

        shall certify whether such profits are available or not and the amount
        thereof (if any). In giving such certificate the auditors shall act as
        experts and not arbitrators and their determination shall be final and
        binding on the Parties.


23.     PURCHASE OPTION

23.1    In consideration of the sum of Pound Sterling1 now paid by Inc to the
        Founders (receipt of which is hereby acknowledged) it is hereby agreed
        that (subject as provided in Clause 23.9) at any time between 1 July
        2002 and 30 June 2004 (both dates inclusive), Inc may serve notice
        ("Option Notice") on the Founders and the other Shareholders requiring
        the Founders and such other Shareholders to sell all their Shares in the
        Company ("the Option Shares") at the Option Price (as defined in Clause
        23.2).

23.2    "Option Price" means a fair price per Share as at the date of the Option
        Notice determined by an independent valuation expert from a first tier
        bank or firm of chartered accountants of international standing and
        reputation (not being the auditors for the time being or past auditors
        of the Company, Inc or the Founders or of any Affiliate of any of them)
        agreed upon by the Founders and Inc and whose costs shall be borne by
        Inc and the Founders equally and in default of such agreement determined
        in accordance with the following formula viz:


                             "Option Price"   =    A      +      B
                                                   ---------------
                                                          2

        Where:

        "A" is a fair price per Share as at the date of the Option Notice
        determined by an independent valuation expert from a first tier bank or
        firm of chartered accountants of international standing and reputation
        (not being the auditors for the time being or past auditors of the
        Company, Inc or the Founders or any Affiliate of any of them) appointed
        by Inc and whose costs shall be borne by Inc ; and

        "B" is a fair price per Share as at the date of the Option Notice
        determined by an independent valuation expert from a first tier bank or
        firm of chartered accountants of international standing and reputation
        (not being the auditors for the time being or past auditors of the
        Company, Inc or the Founders or any Affiliate of any of them) appointed
        by the Founders and whose costs shall be borne by the Founders.

                                                                         Page 31
<PAGE>   35

        In determining a fair price pursuant to this Clause 23.2 an independent
        valuation expert:

        o       shall apply US valuation principles for valuing comparable
                private US Internet co-location companies and shall take account
                of the value of the Company to Inc

        o       shall assume a sale on a going concern basis as between a
                willing buyer and a willing seller contracting on arm's length
                terms as at the date of the Option Notice and on the basis that
                no account is taken of the fact that the Shares are a particular
                portion (and in particular whether a minority or a majority) of
                the total number of Ordinary Shares of the Company

        o       shall act as an expert and not as an arbitrator

        o       may consult with and take such advice as is in his opinion
                desirable from such persons as he may determine

        o       shall, before the issue of any determination hereunder, offer
                the opportunity to each Shareholder to review the information on
                the basis of which such certificate is to be given and allow
                such parties to make written representations of reasonable
                length to him in regard thereto

        o       shall lay down such time limits for the provision of information
                to him and for the making of such written representations as in
                his discretion he considers reasonable and

        o       shall endeavour to issue his determination within two months of
                his being instructed to do so and the Shareholders shall use
                their reasonable endeavours to procure that the determination is
                issued within such period.

23.3    Provided that if A/B is greater than 1.2 or less than 0.8 then in the
        absence of agreement between Inc and the Founders the Option Price shall
        be determined by an independent valuation expert from a London firm of
        chartered accountants of international standing and reputation (not
        being (i) the auditors for the time being or past auditors of the
        Company, or Inc or the Founders or any Affiliate of any of them or (ii)
        a firm previously instructed under Clause 23.2) agreed upon by Inc and
        the Founders or in default of agreement nominated on the application of
        either such party on notice to the other by the President for the time
        being of the Institute of Chartered Accountants in England and Wales.
        The costs of such independent valuation expert shall be borne by Inc and
        the Founders equally.

                                                                         Page 32
<PAGE>   36

        In determining a fair price pursuant to this Clause 23.3, the
        independent valuation expert shall have regard to the matters and
        assumptions referred to in Clause 23.2 and to the valuations prepared by
        the other two independent valuation experts.

23.4    Within 45 days after the determination of the Option Price

        o       if the consideration offered by Inc consists wholly or partly of
                Common Shares of Inc, Inc, the Founders and the other
                Shareholders shall enter into a Purchase Agreement in the Agreed
                Terms and

        o       in any event (subject to the said Purchase Agreement being
                entered into, if required) Inc shall (subject as provided in
                Clause 23.8.2) complete the purchase and the Founders and the
                other Shareholders shall complete the sale of all (but not some
                only) of the Option Shares (such Completion being hereinafter
                called "Completion"). The Option Shares shall be sold with full
                title guarantee and free from all liens, charges and
                encumbrances and with all rights attaching to them with effect
                from the date of Completion.

23.5    On Completion the Founders and the Shareholders (other than Inc) shall
        deliver to Inc:

        23.5.1  duly executed transfers of the Option Shares and the share
                certificates relating to those Shares; and

        23.5.2  a waiver or waivers duly signed by all the members of the
                Company of any rights of pre-emption relative to the Option
                Shares

        and Inc shall deliver to the Founders and the other members the
        consideration for the Option Shares.

23.6    The Option Price may (at Inc's election) be satisfied wholly in cash or
        wholly in Common Shares of Inc or partly in one and partly in the other
        provided that Inc Common Stock is then traded on the NASDAQ National
        Market or listed on a major US Securities Exchange. If Inc Common Stock
        is not traded on the NASDAQ National Market or listed on a major US
        Securities Exchange the consideration shall be cash.

23.7    If Inc elects to satisfy the whole or part of the Option Price in Common
        Shares, the provisions of Clauses 19.11 to 19.14 inclusive shall apply
        mutatis mutandis.

                                                                         Page 33
<PAGE>   37

23.8    If Inc elects to satisfy the Option Price wholly or partly in Common
        Shares then:

        23.8.1  if the Common Shares to satisfy the whole or any part of the
                Option Price are registered with the SEC prior to Completion
                then the number of Shares to be issued to satisfy the relevant
                element of the consideration ("the Relevant Consideration")
                shall be determined by dividing the amount of the Relevant
                Consideration by the value of one Common Share (based upon the
                average closing price of Common Shares over the 10 trading days
                ending three trading days prior to such completion)

        23.8.2  the provisions of Clauses 19.15.1.2 and 19.15.2 shall apply
                mutatis mutandis.

23.9    The option contained in Clause 23.1 shall lapse forthwith automatically
        on a Flotation:

        23.9.1  on the London Stock Exchange or EASDAQ if the Total
                Capitalisation at the time of Flotation exceeds US $75,000,000
                and the Amount Raised exceeds US $10,000,000 or

        23.9.2  on the NASDAQ National Market if the Total Capitalisation at the
                time of Flotation exceeds US $100,000,000 and the Amount Raised
                exceeds US $20,000,000.

23.10   For the purposes of Clause 23.9:

        "Flotation" means the becoming effective of a listing for the share
        capital of the Company on the official list of the London Stock Exchange
        or the admission of any Shares to trading on EASDAQ or the closing of a
        public offering registered under the Securities Act (as defined in
        clause 19.11).

        "Amount Raised" means the gross amount of any new money raised by the
        Company from the subscription for new shares issued by the Company at
        the time of and in connection with the Flotation.

        "Total Capitalisation" means on a Flotation, the valuation placed upon
        the `A' Shares, the `B' Shares and the `C' Shares as shown in a
        prospectus or listing particulars or offering circular published in
        connection with such Flotation less the Amount Raised.

                                                                         Page 34
<PAGE>   38


24.     DEFAULT

24.1    For the purpose of this Clause the following expressions shall have the
        following meanings:-

        24.1.1     `an event of default' means in relation to any Shareholder
                   the occurrence of any of the following in relation to it:-

                    EVENTS TRIGGERING SALE OF SHARES FOR NIL CONSIDERATION

                24.1.1.1 the commission of a material breach of its obligations
                        under Clause 3 (Warranty by Founders), Clause [13]
                        (Operation of the Company), Clause 26 (Confidentiality
                        and Disclosure), Clause 27 (Non-Competition) or Clause
                        28 (Non-Solicitation) of this Agreement and, in the case
                        of a breach capable of remedy, failure to remedy the
                        same within thirty (30) days after being given notice in
                        writing so to do by any other Shareholder such notice to
                        be headed `CURE NOTICE' and to refer to this Clause and
                        the possibility of the Shareholder served with the
                        notice being required to sell its Shares pursuant to
                        this Clause; or

                24.1.1.2 (in the case of Inc) Inc unlawfully terminates the
                        Licence Agreement at any time; or

                24.1.1.3 (in the case of Inc) Inc lawfully terminates the
                        Licence Agreement on not less than 180 days notice
                        expiring on or before 30 June 2001 pursuant to Clause
                        12.4.4 thereof;

                24.1.1.4 (in the case of Mr. Dobbie) Mr. Dobbie prior to 30 June
                        2001 and provided that the Founders hold a Controlling
                        Interest in the Company:

                        (i)     "Voluntarily Resigns" (which expression shall
                                mean in relation to any person that he
                                voluntarily resigns without the agreement of
                                Inc, as a director or terminates his employment
                                with the Company (otherwise than by reason of
                                death or total and permanent disability as
                                certified by a medical 

                                                                         Page 35
<PAGE>   39

                                practitioner approved by Inc, such approval 
                                not to be unreasonably withheld)) or;

                        (ii)    is properly and legally and summarily dismissed
                                without notice or on short notice (as provided
                                for in his service contract or particulars of
                                employment) (herein "Summarily Dismissed"); or

                        24.1.1.5 (in the case of Mr MacSween) Mr. MacSween on or
                                prior to 30 June 2001 and at a time when the
                                Founders hold a Controlling Interest in the
                                Company:

                                (i)     Voluntarily Resigns; or

                                (ii)    is Summarily Dismissed; or

                 EVENTS TRIGGERING SALE OF SHARES FOR 50% OF SUBSCRIPTION PRICE

                  24.1.1.6   (in the case of Mr Dobbie) Mr. Dobbie after 30 June
                             2001 but on or prior to 30 June 2002 and provided
                             that the Founders hold a Controlling Interest in
                             the Company:

                             (i)    Voluntarily Resigns;  or
                             (ii)   is Summarily Dismissed;  or

                   24.1.1.7  (in the case of Mr MacSween) Mr. MacSween after 30
                             June 2001 but on or prior to 30 June 2002 and
                             provided that the Founders hold a Controlling
                             Interest in the Company:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                  24.1.1.8   (in the case of Mr Dobbie) Mr. Dobbie on or prior
                             to 30 June 2001 and provided that the Founders do
                             not hold a Controlling Interest in the Company:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                                                                         Page 36
<PAGE>   40

                   24.1.1.9  (in the case of Mr MacSween) Mr. MacSween on or
                             prior to 30 June 2001 and provided that the
                             Founders do not hold a Controlling Interest in the
                             Company:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                  24.1.1.10  (in the case of Inc) Inc lawfully terminates the
                             Licence Agreement on not less than 180 days notice
                             expiring after 30 June 2001 but on or before 30
                             June 2002 pursuant to Clause 12.4.4 thereof; or

                   EVENTS TRIGGERING SALE OF SHARES FOR SUBSCRIPTION PRICE

                   24.1.1.11 (In the case of Inc) any distress, execution,
                             sequestration or other process being levied or
                             enforced upon or sued out against any substantial
                             part of its property which is not contested in good
                             faith or discharged within 28 days; or

                   24.1.1.12 (In the case of Inc) its inability to pay its debts
                             as they fall due within the meaning of Section 123
                             of the UK Insolvency Act 1986; or

                   24.1.1.13 (In the case of Inc) it ceasing or threatening to
                             cease wholly or substantially to carry on its
                             business, otherwise than for the purpose of a
                             reconstruction or amalgamation without insolvency
                             previously approved by the other Shareholder (such
                             approval not to be unreasonably withheld or
                             delayed); or

                   24.1.1.14 (In the case of Inc) any encumbrancer taking
                             possession of, or a receiver, trustee or
                             administrator being appointed over the whole or any
                             substantial part of its undertaking, property or
                             assets in the case of Inc its entry into Chapter II
                             administration; or

                   24.1.1.15 (In the case of Inc) the making of an order or the
                             passing of a resolution for its winding up,
                             otherwise than for the purpose of a reconstruction
                             or amalgamation without insolvency 

                                                                         Page 37
<PAGE>   41

                             previously approved by the other Shareholder
                             (such approval not to be unreasonably withheld
                             or delayed); or

                  24.1.1.16  (in the case of Mr Dobbie) Mr. Dobbie after 30 June
                             2001 but on or prior to 30 June 2002 and provided
                             that the Founders do not hold a Controlling
                             Interest in the Company:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                   24.1.1.17 (in the case of Mr MacSween) Mr. MacSween after 30
                             June 2001 but on or prior to 30 June 2002 and
                             provided that the Founders do not hold a
                             Controlling Interest in the Company:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                   24.1.1.18 (in the case of Inc) the Company terminates the
                             Licence Agreement by reason of Inc's material 
                             breach thereof pursuant to Clause 12.2 thereof 
                             where the notice of termination expires on or 
                             before 30 June 2002; or

                  24.1.1.19  (in the case of Founders and for so long only as
                             the Founders hold a Controlling Interest in the
                             Company) Inc terminates the Licence Agreement by
                             reason of the Company's material breach thereof
                             pursuant to Clause 12.2 thereof where the notice of
                             termination expires on or before 30 June 2002; or

                  24.1.1.20  (in the case of the Founders) if an Inc Competitor
                             acquires directly or indirectly any interest in any
                             Affiliate of the Founders, where the term "Inc
                             Competitor" means an entity whose business (or that
                             of any Affiliate of such an entity) includes the
                             business of providing co-location and/or Internet
                             connectivity services; or

                  EVENTS TRIGGERING SALE OF SHARES AT FAIR PRICE

                                                                         Page 38
<PAGE>   42

                  24.1.1.21  in the case of Inc) Inc lawfully terminates
                             the Licence Agreement after 30 June 2002
                             pursuant to Clause 12.4.4 thereof; or

                  24.1.1.22  (in the case of Inc) the Company terminates
                             the Licence Agreement by reason of Inc's
                             material breach thereof pursuant to Clause 12.2
                             thereof where the notice of termination expires
                             after 30 June 2002; or

                  24.1.1.23  (in the case of the Founders and for so long only
                             as the Founders hold a Controlling Interest in the
                             Company) Inc terminates the Licence Agreement by
                             reason of the Company's material breach thereof
                             pursuant to Clause 12.2 thereof where the notice of
                             termination expires after 30 June 2002; or

                  24.1.1.24  any governmental action prohibiting or preventing
                             it from continuing to hold shares in the Company or
                             to perform this Agreement; or

                  24.1.1.25 (in the case of Mr Dobbie) Mr. Dobbie after 30 June
                            2002:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed;  or

                  24.1.1.26 (in the case of Mr MacSween) Mr. MacSween after 30
                             June 2002:

                             (i)    Voluntarily Resigns;  or

                             (ii)   is Summarily Dismissed.

        24.1.2     `the Prescribed Price' shall mean in respect of any Ordinary
                   Shares the subject matter of the relevant option;

                   24.1.2.1  in the case of an event of default falling within
                             Clause 24.1.1.1 to 24.1.1.5 inclusive nil per
                             share;

                                                                         Page 39
<PAGE>   43

                   24.1.2.2  in the case of an event of default falling within
                             Clause 24.1.1.6 to 24.1.1.10 inclusive, 50 per cent
                             of the subscription price of each share;

                   24.1.2.3  in the case of an event of default falling within
                             Clause 24.1.1.11 to 24.1.1.20 inclusive the
                             subscription price of each share;

                   24.1.2.4  in the case of an event of default falling within
                             Clause 24.1.1.21 to 24.1.1.26 inclusive a fair
                             price per share determined in the same way as the
                             Option Price under Clause 23.

24.2    If a Shareholder commits or suffers an event of default (as defined in
        Clause 24.1.1), then the other Shareholders shall be entitled in its or
        their (as the case may be) entire discretion to require the defaulting
        Shareholder to sell all of the Shares held or beneficially owned by the
        defaulting Shareholder to (subject as provided below) the other
        Shareholders in proportion (as nearly as may be) to their then holdings
        of Shares in the Company for a sum in aggregate equal to the Prescribed
        Price (as defined in Clause 24.1.2) by serving written notice on the
        defaulting Shareholder at any time within ninety (90) days of the date
        of the occurrence of such event of default coming to the knowledge of
        the other Shareholder stating that the option hereby conferred is
        exercised Provided that if any other Shareholder shall not wish to take
        up its proportion of the Shares of the defaulting Shareholder, then such
        proportion may be taken up by those other Shareholders who do wish to
        take up their proportion pro rata as nearly as may be to the respective
        numbers of Shares then held by such other Shareholders and so on and so
        forth for so long as any other Shareholder continues to state its
        willingness to purchase Shares of the defaulting Shareholder.

24.3    If the option conferred by Clause 24.2 above is exercised, the
        defaulting Shareholder shall deliver to the other Shareholder(s) within
        twenty-eight (28) days after the date of service of the notice
        exercising such option or within twenty eight (28) days of the date the
        Prescribed Price is ascertained and notified to the Shareholders
        (whichever shall be the later) one or more duly executed transfers in
        respect of all its Ordinary Shares made out in such numbers and in
        favour of the other Shareholder(s), as determined in accordance with
        Clause 24.2, may in writing direct together with the 


                                                                         Page 40
<PAGE>   44

        supporting Share Certificates therefor (or an appropriate indemnity in
        respect of any lost Certificates) and against such delivery the other
        Shareholder(s) shall make full payment in sterling in London of the
        Prescribed Price (as defined in Clause 24.1.2) for such Ordinary Shares.
        The Ordinary Shares so transferred shall be deemed to be sold by the
        transferor with full title guarantee with effect from the date of such
        transfer free from any lien, charge or encumbrance with all rights
        attaching thereto.

24.4    At completion of the sale the Directors who were nominees of the seller
        Shareholder shall forthwith resign (without any claims for loss of
        office or otherwise).

24.5    Completion of all relevant matters referred to in this clause shall take
        place simultaneously.

24.6    Inc may elect to satisfy some or all of the Prescribed Price payable by
        it under this Clause wholly in cash or wholly in Common Shares of Inc or
        partly in one and partly in the other provided that Inc Common Stock is
        then traded on the NASDAQ National Market or listed on a major US
        Securities Exchange. If Inc Common Stock is not traded on the NASDAQ
        National Market or listed on a major US Securities Exchange the
        consideration shall be cash. The provisions of Clause 19.11 to 19.14
        inclusive shall apply mutatis mutandis.

24.7    If Inc elects to satisfy the Prescribed Price wholly or partly in Common
        Shares then:

        25.7.1  if the Common Shares to satisfy the whole or any part of the
                Prescribed Price are registered with the SEC prior to Completion
                then the number of Shares to be issued to satisfy the relevant
                element of the consideration ("the Relevant Consideration")
                shall be determined by dividing the amount of the Relevant
                Consideration by the value of one Common Share (based upon the
                average closing price of Common Shares over the 10 trading days
                ending three trading days prior to such completion)

        25.7.2  the provisions of Clauses 19.15.1.2 and 19.15.2 shall apply
                mutatis mutandis.

24.8    If after becoming bound to transfer its Shares the defaulting
        Shareholder makes default in transferring such Shares (or any of them)
        the Company may receive the purchase monies or other consideration and
        the defaulting Shareholder shall be deemed to have appointed any one
        Director or the Secretary of the Company its 


                                                                         Page 41
<PAGE>   45

        agent to execute a transfer of the relevant Shares to the other
        Shareholder and upon execution of such transfer the Company shall hold
        the purchase monies or other consideration in trust for the defaulting
        Shareholder. The receipt of the Company for the purchase monies or other
        consideration shall be a good discharge for the other Shareholder and
        after its name has been entered in the register of members of the
        Company, the validity of the proceedings shall not be questioned by any
        Person.


25.     LEGEND ON SHARE CERTIFICATES

25.1    Each certificate representing any of the Shares held by each of the
        Shareholders in accordance with this Agreement and hereafter acquired by
        any lawfully permitted transferee or successor shall bear the following
        legend:-

        `The holders of the Shares represented by this Certificate are subject
        to the restrictions contained in a Shareholders Agreement between the
        Company and its shareholders, a copy of which may be inspected at the
        registered office of the Company.'


26.     CONFIDENTIALITY AND DISCLOSURE

26.1    Each of the Directors of the Company may communicate any information
        acquired by him in relation to the Company to the Shareholder appointing
        him, subject always to the parties' duty of confidentiality contained in
        Clause 26.2.

26.2    Each party will treat as confidential any information provided to it by
        any of the others which has not been published, or which is not already
        known to the receiving party, and will impose a similar duty of
        confidentiality on any person to whom it is permitted to transfer such
        information. The parties will maintain the utmost confidentiality
        regarding this Agreement at all times and none of the parties will make
        any announcement to the public or to any third party regarding the
        arrangements contemplated by this Agreement without the consents of the
        others such consent not to be unreasonably withheld or delayed save (in
        the absence of agreement) for any statement or disclosure which may be
        required by law or called for by the requirements of NASDAQ National
        Market and/or the US Securities and Exchange Commission and/or the
        London Stock Exchange and/or EASDAQ and any such statement or
        disclosures shall be no more extensive than is usual or necessary to
        meet the requirements imposed upon the party making such statement or
        disclosure.

                                                                         Page 42
<PAGE>   46

26.3    Whilst the parties shall use their best endeavours to ensure compliance
        with this Clause a party in breach of its terms shall not thereby commit
        a material breach of its obligations under this Agreement for the
        purpose of Clause 24.1.1.1 if it can show that it took reasonable steps
        to prevent the breach and it could not reasonably have been expected to
        have prevented it.


27.     NON-COMPETITION

27.1    Each of the Shareholders undertakes that it will not while it or any of
        its Affiliates is a member of the Company or for a period of one year
        thereafter (the `Restricted Period') (and will procure that during the
        Restricted Period none of its Affiliates will), either alone or jointly
        with others, whether as principal, agent, manager, shareholder,
        independent contractor or in any other capacity, directly or indirectly
        through any other person, for its own benefit or that of others at any
        time during the Restricted Period engage in or carry on or be concerned
        or interested in any business in the United Kingdom in competition with
        the Company (other than as a holder for investment of no more than 5% of
        any class of shares or securities dealt in on a recognised stock
        exchange).

27.2    The restrictions contained in Clause 27.1 shall not prevent or inhibit
        Inc or any Affiliate of Inc from engaging in or carrying on or being
        concerned or interested in any business in the United Kingdom in
        competition with the Company at any time after the Licence Agreement has
        terminated or any of the rights granted thereunder to the Company have
        ceased to be exclusive.

27.3    The above restrictions are considered reasonable by the parties but in
        the event that any such restriction shall be found to be void but would
        be valid if some part thereof was deleted or the period of application
        reduced such restriction shall apply with such modification as may be
        necessary to make it valid and effective.


28.     NON-SOLICITATION

        Each Shareholder undertakes that it will not and neither will its
        Affiliates either during the continuance of this Agreement or for a
        period of one year thereafter:

28.1    solicit in competition with the Company the custom of any Person, who
        shall during the 12 months prior to the relevant time be a customer of
        the Company provided that this Clause 28.1 shall not apply to Inc and
        its Affiliates; or

                                                                         Page 43
<PAGE>   47

28.2    endeavour to solicit or entice away from the Company or employ any
        Person who during the 12 months prior to the relevant time was an
        employee of the Company unless such person shall have been unfairly or
        unlawfully dismissed by the Company.


29.     ASSIGNMENT

29.1    Neither of the Shareholders shall assign or transfer or purport to
        assign or transfer any of its rights or obligations hereunder save Inc
        in connection with a transfer of its shares to a Person who acquires a
        Controlling Interest in or purchases all or substantially all of the
        assets of Inc or to an Affiliate of such Person provided that
        simultaneously therewith, such Person or its Affiliate accepts an
        assignment of the benefit and burden of the Licence Agreement. If
        following such an assignment, the Founders would (but for such
        assignment) be obliged to accept Common Shares or Common Stock of Inc in
        whole or partial consideration for the sale of the Founders' Shares,
        then if the Founders so agree at the time of such sale (such agreement
        not to be unreasonably withheld or delayed) the Founders shall be
        obliged to accept Common Shares or Common Stock of the Person concerned.
        In the absence of such agreement at such time, the Person shall have no
        ability to satisfy amounts due to the Founders by the issue of Common
        Shares or Common Stock. Save as aforesaid, references herein to Common
        Shares of Inc or Common Stock of Inc or similar expressions shall be
        read as references to Common Shares of the Person concerned or (as the
        case may be) Common Stock of the Person concerned.

29.2    The parties to this Agreement shall procure that (except for (i) any
        allottee under Clause 2.2 or (ii) any transferee under a transfer made
        pursuant to Clauses 19.3.2 or 19.3.3 or any successor in title to any
        such allottee or transferee) any transferee or allottee of shares in the
        Company shall, prior to any transfer or allotment to it taking effect,
        have entered into an agreement with the parties to this Agreement and
        the other holder or holders for the time being of all the shares in the
        Company substantially in the form set out in the Schedule and provided
        that such transfer or allotment is not otherwise prohibited by this
        Agreement each party to this Agreement shall enter into such an
        agreement whenever requested to do so by any other party to this
        Agreement.


                                                                         Page 44
<PAGE>   48

30.     PROPRIETARY KNOW-HOW

30.1    Save as expressly provided herein no party shall have any right as a
        consequence of this Agreement to utilise any know-how or other
        intellectual property licensed to the Company by any other without the
        other's prior written consent.


31.     NAMES

31.1    The parties acknowledge that the Company does not have any rights to the
        use of the names AboveNet, Internet Service Exchange, AboveNet One-Hop
        Solution, One-Hop Consortium, One-Hop Consortium Member, Global One-Hop
        Network, Global One-Hop Consortium, AboveNet Global One-Hop Network,
        ISPCondo, WebCondo, MRTG, ASAP, APS, EtherValve or any other current or
        future trade mark or name of Inc or to any goodwill associated therewith
        save to the extent provided in the Licence Agreement.

31.2    If at any time both Inc and its Affiliates cease to hold any shares in
        the Company the Shareholders and the Company shall procure that within
        one month thereafter the Company shall cease to use the name AboveNet
        for any purpose and shall take such steps as are necessary to remove
        such name from the registered corporate name of the Company and the
        Shareholders (other than Inc) and their respective Affiliates (other
        than any Affiliate of Inc) shall not thereafter use or suffer to be used
        the name of AboveNet in connection with the operation of the Business.


32.     TERM

32.1    This Agreement shall take effect from the date hereof and shall subject
        as hereinbefore mentioned continue until:

        32.1.1  Terminated by mutual consent in writing by the Shareholders; or

        32.1.2  The date of the commencement of the Company's winding up; or

        32.1.3  The date upon which any Shareholder ceases to be a holder of
                Ordinary Shares in the Company (other than in circumstances
                where Inc's Ordinary Shares are transferred to a Person who
                acquires a Controlling Interest in Inc or to an Affiliate of
                such Person as permitted herein) in which case the Agreement
                shall terminate as regards the Shareholder so ceasing but
                shall continue as regards the other Shareholders

                                                                         Page 45
<PAGE>   49

        Provided that termination shall be without prejudice to any rights of
        the Shareholders accrued at that time and the terms of this Agreement
        shall nevertheless continue to bind the Shareholders thereafter to such
        extent and for so long as may be necessary to give effect to the rights
        and obligations embodied herein.


33.     INTEREST

33.1    If any party fails to make any payment hereunder on the due date or
        within the applicable period for payment, such party shall pay interest
        to the payee on the amount for the time being outstanding at the rate of
        3% per annum above the base lending rate of Bank of Scotland for the
        time being in force on the basis of actual days elapsed from the due
        date for payment or from the date of the expiry of such period (as the
        case may be) until payment in full (after as well as before judgement).


34.     SEVERABILITY

34.1    Each of the provisions contained in this Agreement and in each clause
        and sub-clause hereof shall be construed as independent of every other
        such provision to the effect that if any provision of this Agreement
        shall be determined to be illegal invalid and/or unenforceable then such
        determination shall not affect any other provisions of this Agreement
        all of which other provisions shall remain in full force and effect.

34.2    If any provision of this Agreement shall be determined to be illegal
        invalid and/or unenforceable but would be legal valid or enforceable if
        amended the parties hereto shall consult together in good faith and
        agree the scope and extent of any modification or amendment necessary to
        render the provision legal, valid and enforceable and so as to give
        effect to the intention of the parties as recorded in this Agreement.


35.     CONFLICT WITH ARTICLES

35.1    The parties hereby agree that if and to the extent the Articles of
        Association of the Company conflict with the provisions of this
        Agreement the provisions of this Agreement shall prevail as between the
        Shareholders.

                                                                         Page 46
<PAGE>   50


36.     NO PARTNERSHIP

36.1    Nothing in this Agreement shall constitute or be deemed to constitute a
        partnership between any of the parties hereto and neither of the
        Shareholders shall have any authority to bind the other in any way.


37.     FURTHER ASSURANCE

37.1    The parties hereto shall and shall use their respective reasonable
        endeavours to procure that any necessary third parties shall do execute
        and perform all such further deeds documents assurances costs and things
        as any of the parties may reasonably require by notice in writing to the
        others to carry the provisions of this Agreement into full force and
        effect.


38.     COSTS

38.1    The Shareholders agree that they shall each pay their own costs legal
        fees and other expenses incurred in relation to the negotiation
        preparation and execution of this Agreement and all documents ancillary
        thereto.


39.     ENTIRE AGREEMENT

39.1    This Agreement (and the Articles of Association, the Dobbie Service
        Agreement, the MacSween Service Agreement and the Licence Agreement,
        constitute the entire agreement between the parties in connection with
        the subject matter herein contained and shall take effect in
        substitution for all previous agreements and arrangements whether oral
        written or implied between them in relation to such subject matter.

39.2    Each of the parties hereto confirms that, in agreeing to enter into this
        Agreement, it has not relied on any representation, warranty or
        undertaking (except those contained in this Agreement and/or the Licence
        Agreement) and for the avoidance of doubt each party hereby irrevocably
        and unconditionally waives any right to any remedy of any nature for
        breach of any representation, warranty or undertaking (except those
        contained in this Agreement) which there may have been or which may
        hereafter occur.

                                                                         Page 47
<PAGE>   51


40.     VARIATION

40.1    No variation of any of the terms of this Agreement (or of any other
        documents referred to herein) shall be effective unless it is in writing
        and signed by or on behalf of each of the parties hereto or thereto. The
        expression `variation' shall include any variation, supplement, deletion
        or replacement however effected.


41.     WAIVER/FORBEARANCE

41.1    The rights of any party shall not be prejudiced or restricted by any
        indulgence or forbearance extended to the other and no waiver by any
        party in respect of any breach shall operate or be deemed to operate as
        a waiver in respect of any subsequent breach.


42.     EXECUTION IN COUNTERPARTS

42.1    This Agreement may be executed in counterparts each of which when
        executed and delivered shall be deemed to be an original but all of
        which together shall constitute one and the same instrument.


43.     NOTICES

43.1    Any notice to be given by any party to this Agreement shall be in
        writing an shall be deemed duly served if delivered personally or sent
        by facsimile transmission or by prepaid registered post (airmail in the
        case of an address for service outside the United Kingdom) or delivered
        by recognised international courier (who in the latter case obtains a
        receipt for the notice signed by or on behalf of the addressee) to the
        addressee at the address or (as the case may be) the facsimile number of
        that party set opposite its name below:

<TABLE>
<CAPTION>

        Name of Party:                      Address and Facsimile Number
        -------------                       ----------------------------
<S>                                         <C>                          
        AboveNet Communication Inc          50, W. San Fernando Street SE1010,
                                            San Jose,
                                            California, 95113,
                                            USA
                                            Fax No. 001 408 367 6688
                                            Marked for the attention of the President
</TABLE>

                                                                         Page 48
<PAGE>   52
<TABLE>

<S>                                         <C>                      
        AboveNet UK Limited                 63 Queen Victoria Street,
                                            London
                                            EC4
                                            Fax No. 0171-329 4000
                                            Marked for the attention of Mr R. Masters

        Mr. W. Dobbie                       1 Belgrave Crescent,
                                            Edinburgh
                                            EH4 3AQ

        Mr. A. MacSween                     5 Ellergreen Road,
                                            Bearsden,
                                            Glasgow
                                            GG1 2AJ
</TABLE>

        or at such other address (or facsimile number) as the party to be served
        may have notified (in accordance with the provisions of this clause) for
        the purposes of this agreement.

        43.2       Any notice sent by facsimile shall be deemed served three
                   hours after despatch, if despatched on a business day before
                   3.00 pm or in any other case, at midday on the business day
                   after the date of despatch.

        Here `business day' means a day on which banks are open in the city or
        other location to which the notice is sent; and the times mentioned are
        those in that location.

43.3    Clause 43.2 does not apply:-

        43.3.1     if before the time which the notice would otherwise be deemed
                   to have been served, the receiving party informs the sending
                   party that the notice has been received in a form which is
                   unclear in a material respect; and

        43.3.2     if the receiving party does that by telephone, it despatches
                   a confirmatory telex or fax within three hours.

43.4    Any notice served by prepaid registered post shall be deemed served 48
        hours after posting to an address in the United Kingdom or 5 days after
        posting to an address outside the United Kingdom.

                                                                         Page 49
<PAGE>   53

43.5    In proving the service of any notice it will be sufficient to prove in
        the case of a letter that such letter was properly stamped addressed and
        placed in the post or delivered or left at the current address if
        delivered personally and in the case of a facsimile (subject as provided
        in clause 43.3) that such facsimile transmission was duly despatched to
        the facsimile number of the addressee given above or subsequently
        notified for the purposes of this Agreement.


44.     GOVERNING LAW AND JURISDICTION

44.1    This Agreement (together with all documents referred to herein) shall be
        governed by and construed and take effect in accordance with English
        law.

44.2    Each of the parties hereto hereby submits to the jurisdiction of the
        High Court of England and agrees that in the event of any action being
        commenced the process by which it is commenced may be served on them in
        accordance with Clause 43.

ATTESTATION:

This Agreement has been executed and delivered as a Deed the day and year first
above written.



                                                                         Page 50
<PAGE>   54

                                  THE SCHEDULE
                           (FORM OF SUPPLEMENTAL DEED)

DATE:

PARTIES:

(1)  [                    ] LIMITED (CR No.  )  whose registered office is
     ------------------------------
     situate at [                            ] [together with its successors in
     title and permitted assigns `the New Party]');  and

(2)  [NOTE: All the parties to the principal Agreement including any person
     who has entered into a Supplemental Agreement pursuant to the Principal
     Agreement but excluding any person (other than the Transferor) who has
     ceased to be a Shareholder].

RECITALS:

(A)  Under the terms of an Agreement dated [      ] 199. (`the Principal
     Agreement') and entered into between [          ] [and to which 
     [          ] (`the Transferor') is [an original party] [a party by virtue
     of a Supplemental Deed dated [      ]] the Transferor has sold and
     transferred to the New Party [[insert number and type of shares] subject to
     the New Party entering into this Supplemental Deed OR [the New Party has
     agreed to subscribe for [insert number and type of shares]]

(B)  The New Party wishes to accept such shares subject to such condition and
     to enter into this Supplemental Deed pursuant to the Principal
     Agreement.

OPERATIVE TERMS:

1.   Expressions defined in the Principal Agreement shall (unless the context
     otherwise requires) have the same meaning when used in this Agreement.

2.   The New Party undertakes to and covenants with all the parties to the
     Principal Agreement (including any person who has entered into a
     Supplemental Agreement pursuant to the Principal Agreement) to comply
     with the provisions of and to perform all the obligations in the
     Principal Agreement so far as they become due to be 

                                                                         Page 51
<PAGE>   55

      observed and performed on or after the date hereof as if the New Party
      had been an original party to the Principal Agreement [[in place of] [as
      well as] the Transferor].

3.   The New Party shall become a Shareholder [and the Transferor shall cease
     to be a Shareholder] and on and after the date hereof the New Party
     shall have the benefit of the provisions of the Principal Agreement as
     if the New Party had been an original party thereto [[in place of] [as
     well as] the Transferor] and the Principal Agreement shall be construed
     and apply accordingly.

[4.  For the avoidance of doubt, the New Party shall not be entitled to any
     amount which has fallen due for payment to the Transferor before the
     date hereof and shall not be liable in respect of any breach or
     non-performance of the obligations of the Transferor pursuant to the
     Principal Agreement before the date hereof and the Transferor shall
     remain entitled to each such amount and shall not be released from any
     liability of any such breach or non-performance.]



                                                                         Page 52
<PAGE>   56

EXECUTION:

EXECUTED and DELIVERED by                          )
ABOVENET COMMUNICATIONS INC                        )
(acting by Dr. Paul Steiner its duly               )
appointed Attorney)                                )
as a Deed in the presence of:                      )


 ...................................................
Witness signature



 ...................................................
Witness name in block capitals



 ............................................
 ............................................
 ............................................
Witness address



 ............................................
Witness occupation






EXECUTED and DELIVERED by                          )
ABOVENET UK LIMITED                                )
as a Deed in the presence of:-                     )


 ...................................................
Director




 ...................................................
Director



                                                                         Page 53
<PAGE>   57

EXECUTED and DELIVERED by                          )
WILLIAM DOBBIE                                     )
as a Deed in the presence of:-                     )

 ............................................
Witness signature



 ............................................
Witness name in block capitals



 ............................................
 ............................................
 ............................................
Witness address



 ............................................
Witness occupation





EXECUTED and DELIVERED by                          )
ANGUS MACSWEEN                                     )
(acting by Mr. William Dobbie his duly             )
appointed attorney)                                )
as a Deed in the presence of:-                     )

 ............................................
Witness signature



 ............................................
Witness name in block capitals



 ............................................
 ............................................
 ............................................
Witness address



 ............................................
Witness occupation


                                                                         Page 54

<PAGE>   1
                                                                    EXHIBIT 23.2

                         INDEPENDENT AUDITORS' CONSENT

To the Board of Directors and Stockholders
  of AboveNet Communications Inc.:

     We consent to the use in this Registration Statement of AboveNet
Communications Inc. on Form S-1 of our report dated August 7, 1998 (December 4,
1998 as to the first eight paragraphs of Note 12 and March 31, 1999 as to the
last seven paragraphs of Note 12) appearing in the Prospectus, which is part of
this Registration Statement, and of our report dated August 7, 1998 relating to
the financial statement schedule appearing elsewhere in this Registration
Statement. We also consent to the references to us under the headings "Selected
Financial Data", "Experts" and "Change in Accountants" in such Prospectus.

DELOITTE & TOUCHE LLP

San Jose, California
April 6, 1999



<PAGE>   1
                                                                    Exhibit 23.3

                    INDEPENDENT AUDITOR'S REPORT ON SCHEDULE

To the Board of Directors and Stockholders of AboveNet Communications Inc.

     Our audits of the financial statements of AboveNet Communications, Inc. for
the period from March 8, 1996 (inception) to June 30, 1996 and for the years
ended June 30, 1997 and 1998 also include the financial statement schedule of
AboveNet Communications, Inc., listed in Item 16. (b). The financial statement
schedule is the responsibility of the Company's management. Our responsibility
is to express an opinion based on our audits. In our opinion, such financial
statement schedule taken as a whole, presents fairly in all material respects
the information set forth therein.



DELOITTE & TOUCHE LLP

San Jose, California
August 7, 1999


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