Document:

<PAGE>

                                                                  EXHIBIT 10.30

NEXTLINK
<TABLE>
<CAPTION>
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SERVICE ORDER AND AGREEMENT
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Salesperson:            Mike Margle         CC Representative:                                   Date:      10/19/99
                  --------------------------                   --------------------------              -------------
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Type of Service
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Local:       Long Distance:               Calling Card        Other:   X    Promo:         Centrex          (see attached)
       ------               ------------               ------        -----         ------          --------
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Address Information
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Customer Name:       Fastnet                                    Physical Address:              Same as billing
              ----------------------------------------------                     ---------------------------------------------------
Billing Address:     Two Courtney Place
              ----------------------------------------------                     ---------------------------------------------------
                     Suite 130
              ----------------------------------------------                     ---------------------------------------------------
                     3864 Courtney Street                          City:                                 ST:        Zip:
              ----------------------------------------------            --------------------------------     ------     ------------
City:         Bethlehem      ST:    PA       Zip:   18017          Install Contact:          Phil Weller
     -----------------------    ------------     -----------                       -------------------------------------------------
Customer Contact:          Phil Weller                             Date to be Contacted:      M-F   8-5
                 -------------------------------------------                            --------------------------------------------
Title:   V.P.-Engineering             Phone:   610-266-6700        Title:   V.P. Engineering            Phone:     610-266-6700
      -------------------------------       ----------------             ------------------------------       ----------------------
Fax:     610-231-9525                 E-Mail:                      Fax:    610-231-9525                 E-Mail:
    ---------------------------------        ---------------           -------------------------------- ----------------------------
Web site address:                                                  ISP:
                 -------------------------------------------           -------------------------------------------------------------
<CAPTION>
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AGREEMENT INFORMATION
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No. of Lines        Contract Type:  (Monthly):       Term (Specify):  3 yrs       Promo/Special Event:             Tax Payer ID:
             ------                            -----                -------------                     ------------              ----
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MONTHLY CHARGES
------------------------------------------------------------------- ----------------------------------------------------------------
                                    Amount    Qty  Total                                        Amount      Qty  Total
                                   --------   ---  -----                                       --------     ---  -----
<S>                                <C>        <C>  <C>   <C>                                   <C>          <C>  <C>
                                                         Local Line/DID Trunk Connection         $65.00     x
Basic Access Package                $15.95     x         DID Number Charge (first 20)            $10.00     x
Basic Access No Toll/LD             $25.00     x         DID Number Charge (each add'l. 20)      $13.50     x
Basic Access Package (Phila.)       $11.50     x         Local T-1 Charge                       $590.00     x
Hunting                                 NC     x         Local T-1, per Activated Channel        $65.00     x
DID Trunk                           $39.00     x         Presubscription Change                   $5.00     x
DID Numbers (block of 20)            $5.95     x         Remote Call Forwarding , Per Palh       $65.00     x
Local T-1 (span)                   $390.00     x         Voice Mail Installation                 $13.50     x
Local T-1 (Per activated channel)   $10.00     x         Other Tariffed NRC                     $           x
Call Forward Busy                    $1.00     x                            ------               ------
Call Forward No Answer               $1.00     x                                                 Metro Intralata Long Distance
Call Forward Variable                $1.00     x         NEXTLINK Services (Check all that apply)
Call Forward, Remote Access          $6.00     x            Calling Cards:    Number of Cards    (Attach Calling Card Form)
Calling Number Delivery              $8.50     x         ---                                 ---
Calling Number Deliver w/Name        $9.00     x            800/8XX Service (Attach Resp. Org. form)
Calling Number Delivery Blocking     $  NC     x         ---
Additional Directory Listing         $2.05     x         Other Carrier:                          Metro Intralata Long Distance
Speed Dial - 8 Numbers               $1.00     x
Speed Dial - 30 Numbers              $2.00     x
Call Pick-Up                         $1.00     x         Carrier Name
Call Transfer                        $1.00     x                     ---------------
Call Waiting                         $1.00     x         Carrier PIC Code
Conference, Three Way                $1.00     x                         -----------
Remote Call Forward                 $12.00     x
                                                         Basic Single Voice Mailbox               $5.00     x
     Point to Point          $[*] x [*] $8296.82         Basic Single Voice Mailbox + Paging     $65.00     x
----------------------------                             Basic Single Voice Mailbox + Transfer   $13.50     x
DS-3 Bethlehem to                                          to Attendant
----------------------------                             Basic Single Voice Mailbox +Paging
Mechanicsburg                                              +Transfer to Attendant                $12.50     x
----------------------------                             Enhanced Single Voice Mailbox           $15.50     x
Requested Due Date:  11/15/99                            Extension Voice Mailbox System*
                                                           (Extensions add'l. charge)             $7.50     x
                                                         Extension Boxes (Each)                   $2.50     x
                                                         9 or more mailboxes (Each)               $         x
                                                                                                   ----
                                                         ALL VOICE MAIL ORDERS REQUIRE SEPARATE FORM
                                                            Multilocation: List Main Billing Number Here       (attach form)
                                                         ---                                            -------
                                                            Tax Exempt (Attach Federal, State and/or Local Certificates)
                                                         ---
                                                            Account Codes - Outbound ONLY (Attach Detail Sheet)
                                                         ---
------------------------------------------------------------------- ----------------------------------------------------------------
</TABLE>

[*] We are seeking confidential treatment of these terms, which have been
omitted. The confidential portion has been filed separately with the
Securities and Exchange Commission.

<PAGE>

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CUSTOMER SIGNED AND APPROVED
--------------------------------------------------------------------------------
By signing this order form, I authorize NEXTLINK Pennsylvania, (herein referred
to as NEXTLINK) to make whatever inquiries are necessary, including checking my
credit history, to verify any statements made on this application and to
determine my eligibility for local and/or long distance service whenever
NEXTLINK deems it necessary. I authorize any person or corporation to compile
and furnish NEXTLINK such information as is necessary to allow NEXTLINK to
process this application. I agree to pay all charges incurred on my NEXTLINK
account, including any applicable state, federal or local use, excise, sales
privilege taxes, duties or similar liabilities by the stated due date and to
adhere to all of the terms and conditions stated in NEXTLINK's tariffs and the
Terms and Conditions on the back of this Service Order and Agreement. Further, I
represent that I am authorized to approve and accept the responsibility of the
terms and conditions herein.
--------------------------------------------------------------------------------
Authorized
Signature: /s/ Phillip L. Weller       Authorized Signature:
          ----------------------                            --------------------
Company Name: FASTNET                  Company Name: NEXTLINK Pennsylvania, Inc.
             -------------------                    ----------------------------
Title/Date: VP Engineering             Title/Date: Sales Mgr 10/19/99
           ---------------------                  ------------------------------
--------------------------------------------------------------------------------

<PAGE>

                              TERMS AND CONDITIONS

1. SERVICE: During the term hereof, NEXTLINK Pennsylvania ("NEXTLINK") shall
provide Customer with the telecommunications services designated on this Service
Order and Agreement ("Agreement"). The services offered by NEXTLINK under this
Agreement are offered pursuant to applicable tariffs, which are filed with
applicable federal and state regulatory agencies, and these terms and
conditions. In the event of a conflict between this Agreement and such tariffs,
the tariffs shall control. Tariffs are available for review at NEXTLINK's
offices. This Agreement and any attachments, together with the applicable
tariffs constitute the entire agreement of the parties and supercedes all prior
discussions or agreements, whether written or oral, including but not limited to
any advertising, brochures, or solicitations. Should Customer request additional
service(s) subsequent to execution of this Agreement, Customer and NEXTLINK
agree to execute an additional agreement for such service(s). Customer agrees to
cooperate with NEXTLINK to accomplish service activation by providing NEXTLINK
access to Customer's premises and facilitating testing and any other service
delivery requirements. Service activation shall commence when NEXTLINK equipment
has been installed and telephone service is made available to Customer.

2. PAYMENT OBLIGATION: Customer shall pay NEXTLINK for service pursuant to the
terms and conditions of the applicable tariff(s) and this Agreement. Prices for
service are exclusive of applicable taxes. No later than thirty (30) calendar
days after service activation, NEXTLINK will bill Customer monthly for service
provided hereunder and usage itemization shall accompany each invoice. Invoices
shall be due and payable upon receipt. Undisputed charges for service that are
not paid within thirty (30) days after the invoice date shall be past due. The
lower of interest of 1.5% per month, or the maximum amount permitted by law,
will be charged on past due amounts beginning the 31st day following the invoice
date. If charges are not paid within ninety (90) days of the due date, and
NEXTLINK submits the account for collections, Customer shall pay all collection
costs including, but not limited to, reasonable Attorney's fees. Failure to pay
said bill within ninety (90) days may result in discontinuance of service.

3. TERM & RENEWAL: This Agreement shall be effective upon complete execution by
the parties. The term is set forth on the Service Order and shall commence on
the service activation date. If no term is specified or following the expiration
of the term, this Agreement shall continue on a month-to-month basis, upon the
terms and conditions in the applicable tariff(s) and specified herein. In the
event of early termination of this Agreement by Customer, or termination by
NEXTLINK for material breach, Customer shall pay NEXTLINK all non-recurring
charges reasonably expended to establish service to the Customer; any
disconnect, early cancellation, or termination charges incurred and paid to
third parties on behalf of customer; plus all recurring charges for the balance
of the then current term.

4. LIABILITY/INDEMNIFICATION/WARRANTY: NEXTLINK agrees to respond to emergency
interruptions of service in a timely manner. NEXTLINK agrees to maintain and
service all NEXTLINK equipment necessary to fulfill the terms of this Agreement
at no expense to the Customer.

With respect to claims or suits by Customer, its customers, or any others for
damages relating to or arising out of acts or omissions involving initiation,
installation, provisioning or restoration of any services or facilities offered
under this Agreement, NEXTLINK's liability, if any, shall be limited to the
lesser of $500 or, in the event of any failure of service, an amount equal to no
more than the proportionate charge (based on the rates then in effect) for the
service for the period of time during which the service was affected. NEXTLINK
shall in no event be liable for loss of profits, or incidental, indirect,
exemplary, punitive, special or consequential damages suffered by Customer,
Customer's customers, or any other persons or entities and relating to or
arising out of the services, the system equipment, or any other obligation of
NEXTLINK under this Agreement or otherwise, including but not limited to,
temporary service interruptions or the failure by NEXTLINK or any third party to
repair the system equipment or services, or for any act or omission of any other
entity, company or companies furnishing a portion of the service.

IN ACCORDANCE WITH THE REQUIREMENTS OF UNIFORM COMMERCIAL CODE, NEXTLINK MAKES
NO REPRESENTATION OR WARRANTY EITHER EXPRESS OR IMPLIED REGARDING THE SERVICES
OR SYSTEM EQUIPMENT, AND SPECIFICALLY DISCLAIMS ANY WARRANTY, INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE, AND ASSUMES NO OBLIGATION WITH RESPECT TO THE ENFORCEMENT OF
ANY MANUFACTURER'S WARRANTIES AND GUARANTEES. NO DEFECT, UNFITNESS, OR OTHER
CONDITION OF SYSTEM EQUIPMENT OR SERVICES SHALL RELIEVE CUSTOMER OF THE
OBLIGATION TO PAY ANY CHARGES HEREUNDER OR PERFORM ANY OTHER OBLIGATIONS UNDER
THIS AGREEMENT.<PAGE>

                                                                   EXHIBIT 10.31

                LEASE AND EXCLUSIVE OPTION TO PURCHASE AGREEMENT

         This Lease and Exclusive Option to Purchase Agreement is made this 6th
day of January, 2000, by, between and among ISK Magnetics, Inc. (hereinafter
called "Landlord"), and FASTNET CORPORATION, A Pennsylvania Corporation,
(hereinafter called "Tenant").

         1. LEASED SPACE AND PURPOSE. Landlord hereby rents to Tenant a certain
building located at 286 Broadhead Road, Lehigh Valley Industrial Park, IV,
Northampton County, Pennsylvania, consisting of the building and improvements
and parking lot, collectively referred to as the Leased Space herein and more
particularly described in Exhibit A attached hereto. This Lease and Option to
Purchase is for the entire Building and property and lot of Landlord at the
above-stated location.

                  (a) PERSONAL PROPERTY. Specifically included as part of this
Lease and together with the Leased space shall be the personal property
(equipment, inventory, furniture, fixtures, goods, etc.) contained in the Leased
Space during the inspection by Tenant and its representatives which took place
on December 16,1 999. The Leased Space and Personal Property shall be
collectively referred to herein as the Leased Property. If Tenant exercises its
Option to Purchase as set forth herein, the Personal Property shall become the
Tenants at Closing on said Option and Landlord represents that it has good title
to same and can transfer same by acceptable Bill of Sale at Closing under the
Option.

                  (b) Landlord will take all steps so that Tenant can occupy and
utilize the current office area portion of the Leased Space of 18,600 square
feet no later than January 5, 2000. Said portion of the Leased Space shall be in
broom swept condition and made ready by Landlord, in al respects necessary, for
occupancy by Tenant.

                  (c) Landlord shall be obligated and required under this Lease
to remove, extract and clean out all lab fixtures and equipment and related
fixtures and equipment in the remaining 15,980 square feet of the Leased Space
(known as the Research Lab and Development Area) by March 1, 2000 such that said
space can be converted and utilized as office space by Tenant. Completion by
Landlord of this portion by march 1, 2000 is a material part of this Lease. In
doing so Landlord will ensure and warrant that the Research Lab and Development
Area of the Leased Space complies, with all the terms and conditions in
paragraph 7 herein. Said obligations, without limitation, shall survive both
possession by Tenant and purchase of the Leased Space and Property, if any,
pursuant to the Exclusive Option to Purchase granted herein.

                  (d) Landlord will build and construct, at its sole cost and
expense, an additional 79 parking spaces (above and beyond the existing 55
parking spaces) by

<PAGE>

March 1, 2000. Landlord will obtain any and all required permits and approvals
from any and all local and municipal governing bodies and agencies and Landlord
represents that it has obtained and/or will be able to obtain any and all such
approvals under any and all local ordinances, codes and regulations. Tenant
understands that topcoat application may be delayed beyond March 1, 2000 due to
weather conditions but same shall be completed as soon as possible. The
completion of the additional 79 parking spaces is a material part of this Lease.

                  (e) ROOF RIGHTS. Tenant shall have the right to use the roof
of the building containing the Leased Space for the installation, construction
and maintenance of antennas and related equipment. Tenant will use all
reasonable precautions to avoid, prevent and minimize damage to the roof and
Leased Space and installation of any and all such equipment shall be in
accordance with all applicable codes and regulations. Tenant shall contract with
the original roofing installers to obtain warranties as to any and all needed
roof penetrations. If Tenant undertakes responsibility for same Tenant will
provide Landlord with appropriate engineering drawings and warranties. Tenant
will utilize and install rubber roof matting on the roof consistent with the
existing matting on any areas or access ways where the roof rights are exercised
by Tenant.

         2. TERM. The term shall be Six (6) years beginning on the date of
possession by Tenant hereunder (the Commencement Date) and ending on the date
which is Six (6) years from and after the Commencement Date (the Term).

                  (a) Tenant shall have the Option to renew this Lease for an
additional Term of Five (5) years (Additional Term) upon the same conditions and
terms set forth in this Lease, except for rent payable which shall be negotiated
for the Additional Term, in good faith, and set based on the reasonable fair
rental value of the premises during the Additional Term.

                  (b) The Tenant's future obligations under this Lease shall
terminate when and if Tenant purchases the Leased Property pursuant to the
Exclusive Option to Purchase granted to Tenant herein and/or Tenant otherwise
purchases the property identified under the Right of First Refusal.

         3. RENT. Tenant shall pay Landlord rent for the Leased Property during
the term hereof as follows:

                  (a) For the first Lease Year, beginning on the Commencement
Date and ending on the last day of the first Lease Year, annual rent shall be
$345,8000.00 (Three Hundred Forty Five Thousand Eight Hundred and 00/100
Dollars), payable in Twelve (12) consecutive monthly installments of $28,816.66
(Twenty Eight Thousand Eight Hundred Sixteen and 66/100 Dollars) per month due
on the first day of each calendar month. Even though Tenant shall be unable to
occupy and utilize the portion known as the Lab Area between Commencement Date
and March 1, 2000, Tenant agrees from Commencement Date of the Lease to pay for
said space as if it was fully occupied

                                       2
<PAGE>

and utilized by Tenant provided that Landlord complies with its obligations set
forth in the first sentence of section 1(c) above.

                  (b) For the second through the sixth and final Lease Year,
annual rent shall be as follows:

<TABLE>
                   <S>                              <C>
                   Second Lease Year:               $356,174.00
                   Third Lease Year:                $366,859.22
                   Fourth Lease Year:               $377,865.00
                   Fifth Lease Year:                $389,200.95
                   Sixth Lease Year:                $400,876.98
</TABLE>

         All rent during the Second to Sixth Lease Years shall also be paid in
equal consecutive monthly installments, due on the first day of each calendar
month, during each such Lease Year.

                  (c) All rents shall be payable at such place as Landlord shall
direct.

         4. ADDITIONAL RENT. Tenant agrees to pay during the term of the Lease
in a timely basis in addition to the minimum rent specified above:

                  (a) All real estate taxes imposed against the Leased Space as
may be prorated from the Commencement Date hereunder. It is represented herein
by Landlord that the annual Real Estate taxes for the Leased Space are as
follows:

<TABLE>
                   <S>                            <C>
                   Total Assessment:              $1,632,600.00
                   County Taxes:                  $    5,224.32
                   Township:                      $    3,469.32
                   School Taxes:                  $   20,423.34
                                                  -------------
                   Total:                         $   29,116.98
</TABLE>

Prior to the commencement of each calendar year, Landlord shall provide Tenant
with a Real Estate Tax Statement outlining a reasonable estimate, based upon the
historical information available to the Landlord, together with reasonable
projections, of Tenant's Real Estate Tax expense. Commencing with the first
month of the succeeding Lease Year, Tenant shall pay to Landlord, monthly
installments in advance equal to one-twelfth (1/12th) of the Real Estate Tax
Expense for the succeeding Operating Year.

                  (b) All charges for water, sewer, oil, electricity, and gas
consumed in or with respect to the leased space prorated as of the Commencement
Date and all utility costs;

                  (c) All costs of interior repairs, replacements and
maintenance related to the Leased Spaced (but not related to structural building
or structural parking lot or code violation repairs which must be disclosed,
remedied and fully repaired by Landlord).

                                       3
<PAGE>

Tenant will be responsible, and shall contract on its own, for landscaping; snow
removal; refuse and garbage service; janitorial and for repairs to the parking
lot and Leased Space resulting from general wear and tear arising from Tenant's
use. Tenant will maintain and monitor any and all security systems related to
the premises including, without limitation, theft prevention, security and fire
systems and alarms.

         5. LATE CHARGE. In the event that any monthly installments shall become
overdue for a period in excess of ten (10) days, Tenant shall pay an additional
charge to defray the expense incident to handling such overdue installment
equivalent to two (2%) percent of each such overdue installment. Such additional
charge shall be due on demand and payable as additional rent.

         6. CONDITION OF LEASED PROPERTY. Landlord has represented that the
Leased Space is in compliance with all applicable state, federal and local
rules, codes and regulations. Landlord knows of no condition or defect that
would prevent Tenant from operating its business on the Leased Space. Landlord
has no knowledge of any condition which would prevent Tenant from obtaining all
necessary licenses, building, zoning and occupancy permits required for its
business at the Leased Space.

                  (a) No pollutants or other toxic or hazardous substances,
including any solid, liquid, gaseous or thermal irritant or contaminant, such as
smoke, vapor, soot, fumes, acids, alkalis, chemicals or waste (including
materials to be recycled, reconditions or reclaimed) (collectively Materials)
have been discharged, dispersed, released, stored, treated, generated, disposed
of, or allowed to escape (collectively referred to as the Incident) on or from
any property and/or asset being leased or transferred to Tenant pursuant to this
Agreement or disposed of by Landlord in connection with its business or, to the
best of its knowledge, any person acting on behalf of Landlord in violation of
any federal, state or local statutes, laws or regulations.

                  (b) To the best of Landlord's knowledge after due inquiry, no
asbestos or asbestos-containing materials have been installed (and have not
since been removed) used, incorporated into, or disposed of on any property
and/or asset being leased or transferred to Tenant pursuant to this Agreement
and Landlord has not installed, used, incorporated into, or disposed of any
asbestos or asbestos-containing materials on the Leased Space or in connection
with its business.

                  (c) To the best of Landlord's knowledge, no polychlorinated
biphenyls (PCBs) are located on the Leased Space in the form of electrical
transformers, fluorescent light fixtures with ballasts, cooling oils, or any
other device. Landlord has not installed, used, incorporated into, or disposed
of any PCBs or PCB-containing equipment or materials on or in any property
and/or asset being leased or transferred to Tenant pursuant to this Agreement in
violation of any federal, state or local statutes, laws or regulations.

                                       4
<PAGE>

                  (d) No underground storage tanks are located on the Leased
Space or were located on any part of the Leased Space and/or asset being Leased
and/or transferred to Tenant pursuant to this Agreement and subsequently removed
or filled.

                  (e) No investigation, administrative order, consent order and
agreement, litigation or settlement (collectively referred to as the action)
with respect to the Leased Space is proposed; or to the best of Landlord's
knowledge threatened, or anticipated or in existence with respect to any part of
the Leased Space and/or any asset being leased and/or transferred to Tenant
pursuant to this Agreement.

                  (f) To the best of Landlord's knowledge, the Leased Space
being leased and/or offered for sale pursuant to the Exclusive Option under this
Agreement, has at all times been in compliance with all applicable federal,
state and local statutes, laws and regulations relating to the environment
including, without limitation, OSHA and the EPA and DEP. No notice has been
served on Landlord from any entity, governmental body, or individual claiming
any violation of any law, regulation, ordinance or code or requiring compliance
with any law, regulation, ordinance or code, or demanding payment or
contribution for environmental damage or injury to natural resources.

                  (g) Landlord represents that there are no structural defects
with regard to the Leased Space including, without limitation, roof; walls;
parking lot and any and all building parts and foundations. Landlord will be
fully responsible for, and obligated to repair and maintain, throughout the Term
and any Additional Term hereof, the structure of the building, including without
limitation, the roof, walls, floors and foundations and including any structural
defects or problems relating to the parking lot, except wear and tear from
Tenant's use on the parking lot as set forth herein.

                  (h) All plumbing, utility, electrical, HVAC, fire suppression,
sewer, storm water drainage and retention systems serving the Leased Space is in
compliance with all applicable codes and in working condition.

         7. ENVIRONMENTAL CONCERN.

                  (a) With respect to hazardous substances deposited or employed
in the Leased Space prior to the Commencement Date, Landlord agrees to take full
responsibility for all financial consequences of hazardous substances arising
from and/or related to the Leased Space including, without limitation, as such
may relate to paragraph 6 above. The financial consequences include, but are not
limited to, those triggered by violations of the provisions of:

                           (i) the Comprehensive Environmental Response,
Compensation and Liability Act, 42 U.S.C.; Section 9601-9657 as amended by the
Super Fund Amendments and Reauthorization Act of 1986, Public Law No. 99-299,
100 Stat. 1613 (October 17, 1986);

                                       5
<PAGE>

                           (ii) the Resource Conservation and Recovery Act, 42
U.S.C. Section 6901-6991(I) as amended by the Super Fund Amendments and
Reauthorization Action of 1986, Public Law No. 99-499, 100 Stat. 1613 (October
17, 1986);

                           (iii) the Toxic Substances Control Act, 16 U.S.C.
Section 2601-1629;

                           (iv) the Pennsylvania Clean Streams Law, 35 Pa.C.S.A.
Section 691.1-1169.101 (Purdons 1977 and Supp. 1987);

                           (v) the Pennsylvania Solid Waste Management Act, 35
Pa.C.S.A. Sections 6018.101-6018.1003 (Purdons Supp. 1987);

                           (vi) any applicable Commonwealth of Pennsylvania
and/or Federal statute, whether directly or indirectly applicable;

                           (vii) the Hazardous Sites Cleanup Act of 1988, Act
No. 1988-108, 1989 Pa.Legis.Serv. No. 6 January 1989 at 657, et seq.; and

                           (viii) specific financial consequences will include,
but are not limited to, the costs entailed by the following:

                                    (a) Investigations;

                                    (b) Remediation;

                                    (c) Loss of value of property;

                                    (d) Loss of use of the property;

                                    (e) Off-site property damage;

                                    (f) Liability to third persons injuries from
exposure to the contamination;

                                    (g) Criminal penalties; and/or

                                    (h) Civil penalties.

                  (b) With respect to hazardous substances deposited or employed
in the Leased Space or on the Leased Property prior to the Commencement Date
Landlord agrees to indemnify and hold Tenant and its successors and assigns
harmless from and against all claims, demands, or liabilities, which may arise
from any such hazardous substance or structurally unsafe condition arising from
or related to the Leased Space and Property and/or any future costs due or
related to any contaminated materials not

                                       6
<PAGE>

removed from any part of the Leased Space and/or any property owned, leased,
rented or used by Landlord at the Leased Space.

                  (c) Tenant may conduct a phase I environmental audit and/or
any other necessary environmental testing of the Leased Space as its cost and
expense. (Landlord shall, with all due diligence, cure and remediate any and all
environmental and hazardous material conditions and/or concerns created or
existing prior to the Commencement Date at its sole cost and expense and hold
harmless and indemnify Tenant as to same.) If after Commencement Tenant cannot
occupy any part of the Leased Space due to such environmental problems and
concerns, the Rent hereunder shall be abated for any such period. The
obligations of Landlord pursuant to this paragraph shall be in addition to
Landlord obligations under paragraphs 6 and 7 without limitation hereunder.

                  (d) With respect to hazardous substances deposited or employed
in the Leased Space on or subsequent to the Commencement Date, Tenant agrees to
take full responsibility for all financial consequences of such hazardous
substances arising from and/or related to the Leased Space, including without
limitation, as such may relate to paragraph 7 herein.

                  (e) With respect to hazardous substances deposited or employed
in the Leased Space or on the Leased Property on or subsequent to the
Commencement Date, Tenant agrees to indemnify and hold Landlord and its
successors and assigns harmless from and against all claims, demands, or
liabilities which may arise from any such hazardous substances and which are
related to the Leased Space and Property and/or future cost due or related to
any contaminated materials deposited or employed in the Leased Space after
Commencement Date not removed by Tenant upon the termination of this Lease from
any part of the Leased Space and/or any property owned, leased, rented or used
by Tenant at the Leased Space.

                  (f) Landlord, however, does not waive any of its rights
against third parties who may be responsible for any such hazardous conditions
or substances employed or deposited in the Leased Space prior to the
Commencement Date.

         8. SURVIVAL OF REPRESENTATIONS. All representation, warranties and
agreements made by Landlord in this Agreement shall survive the execution and
delivery of this Agreement; shall survive possession by Tenant and shall also
survive Closing on the Exclusive Option to Purchase by Tenant hereunder.

         9. AFFIRMATIVE AGREEMENTS OF LANDLORD. Landlord agrees;

                  (a) to maintain, repair and replace the structure of the
Leased Space and parking lot in the same good order and condition as on the
Commencement Date and to make all structural repairs and replacements
foreseeable and unforeseeable, to all portions of the leased space throughout.
Any and all repairs or improvements required of Landlord, shall be the
Landlord's responsibility who shall keep the property up to all

                                       7
<PAGE>

applicable codes and building safety, inspection, construction and structural
requirements.

                  (b) Landlord has good and marketable title to the Leased Space
and Leased Property, free and clear of all liens, pledges, mortgages, security
interests, conditional sales contracts and/or other encumbrances.

                  (c) At execution of this Lease (and at Closing under the
Option to Purchase) Landlord shall deliver to Tenant certified copies of
Corporate Resolutions duly adopted by Landlord authorizing the within
transactions.

         10. AFFIRMATIVE AGREEMENTS OF TENANT. Tenant agrees:

                  (a) to comply with any and all requirements, present or
future, of any of the constituted public authorities, as well as with
recommendations of the Board of Fire Underwriters and of the insurance carriers.

                  (b) to use every precaution against fire;

                  (c) to give Landlord proper notice of fire or material damage
occurring in or to the leased premises.

                  (d) to keep the payment, curb and parking lot which is part of
the Leased Space free from dangerous snow and ice.

                  (e) to permit Landlord to have access to the leased space and
the parking lot provided such access is necessary and twenty-four (24) hours
advance notice is given;

                  (f) to maintain in full force and effect with respect to the
leased space and parking lots and Tenant's use thereof, comprehensive public
liability insurance, naming Landlord as an additional insured, covering injury
to persons and property in sufficient amounts.

         11. FURTHER AGREEMENTS TO TENANT. Tenant agrees that it will do none of
the following things without prior written consent of the Landlord:

                  (a) make any structural alterations, extensive improvements or
other material additions to the leased space, unless consented to by Landlord
prior to the initiation of work which consent shall not be unreasonably
withheld;

                  (b) Vacate or desert the leased space, or permit the same to
be empty or unoccupied without good reason and without prior notice to Landlord.

Tenant shall be responsible for any changes, repairs, replacements or additions
to the water system, plumbing system, heating system, air conditioning system,
or electrical

                                       8
<PAGE>

system, servicing the Leased Space necessitated by the installation, maintenance
or use of any equipment of any kind or nature installed in the Leased Space
(whether with or without Landlord's consent) which are beyond the capacity of
any electric, water, heating, air conditioning, plumbing or sewer system
servicing the Leased Space;

         12. ALTERATIONS BY TENANT. All of the work and improvements of the
Leased Space performed by Tenant shall be done in accordance with plans and
specifications which shall comply with all governmental regulations and codes
and Tenant, at its own cost and expense, shall obtain all governmental permits
required, if any, for its work and improvements. In making such alterations and
improvements, Tenant does so on its own behalf and not as an agent of Landlord.
In causing said alterations and improvements to be made, Tenant shall not affect
or weaken the structure of the building.

                  (a) It is understood that no materialman, mechanic or
contractor shall have the right to file any lien against said building by reason
of the said work and materials and in the event that any lien is filed, Tenant,
within twenty-four (24) hours, will commence legal and other action intended to
cause the said lien to be discharged or satisfied of record or in any other
manner pursuant to law removed from the records, so that the same shall no
longer be a lien against the said premises. Tenant agrees to hold the Landlord
harmless and indemnify Landlord against any and all loss, liability, costs,
damages, casualties, and expenses suffered or incurred by reason of any such
lien.

                  (b) Tenant shall require his contractor, for himself and all
subcontractors and parties acting through or under him, to agree that no
Mechanic's Lien or claim shall be filed or maintained by them, or any of them,
against the said real estate or against the building of which the premises
herein demised are a part for or on account of any work done as aforesaid, and
Tenant shall require his contractor, for himself and all subcontractors and
parties acting through or under him, to expressly waive or relinquish the right
to have, file or maintain any Mechanic's Liens or claims against said real
estate or buildings of which the premises herein demised are a part. Tenant
shall require said materialman, mechanic or contractor to execute prior to the
commencement of any work upon the leased space, a separate Waiver of Liens in
form and substance satisfactory to Landlord. Tenant shall, at its own cost and
prior to the commencement of any work, cause such Waiver to be filed of record.

                  (c) At the termination of the Term and the Additional Term (if
any) Tenant shall be entitled to remove, in addition to all its personal
property, any and all trade fixtures and other fixtures and/or improvements made
by Tenant during the Term.

                  (d) Landlord shall provide at Tenant's request complete
as-built mechanical and structural drawings, plans and specifications and any
and all related documents, drawings and plans related to the Leased Space.

                  (e) Tenant shall have the right to install, modify, add or
expend any and all utility systems on the Leased Space provided same is
reasonably necessary for

                                       9
<PAGE>

Tenants' business and at all times is done in compliance with all applicable
codes and regulations and in accordance with drawings and specifications
approved by Landlord, provided further that such approval shall not be
unreasonably withheld. Tenant shall have the right to install any and all power
or emergency generators it requires provided same is in compliance with all
applicable safety and zoning codes and regulations.

         13. NON-LIABILITY OF LANDLORD. Tenant expressly agrees to indemnify,
defend and hold Landlord harmless from any liability for any injury to any
person or damage to any property in the leased space or on the parking lot due
to Tenant's negligence.

         14. With regard to all work, improvements, remediation cleaning,
inspection and removals which Landlord is obligated to undertake and complete
hereunder, Landlord shall exercise all reasonable care and diligence, to avoid
and minimize to the greatest degree possible, any and all interference with
Tenant business operations and activities.

         15. Tenant shall have the complete and unrestricted right to place any
and all signs, lighting, advertising, awnings or billboards it wishes in its
sole discretion upon the Leased Space and/or exterior of the Leased Space and/or
on the lot containing the Leased Space, provided, however, Tenant complies with
applicable zoning ordinances and regulations. Tenant shall, after commencement,
remove all of Landlord's signs at Tenant's expense.

         16. DEFAULTS AND REMEDIES. The following shall be an event of default
provided Tenant is first provided with Thirty (30) days written notice and
opportunity to cure:

                  (a) if tenant does not pay in full when due any amount due
hereunder or violates or fails to perform or otherwise defaults with respect to
any one or combination o the provisions of this Lease;

                  (b) if Tenant files a petition in bankruptcy or insolvency or
for reorganization or for the employment of a Receiver or Trustee, or if Tenant
makes an assignment for the benefit of creditors or takes advantage of any
insolvency act or if a petition in bankruptcy or insolvency or for
reorganization or the appointment of a Receiver or Trustee is filed against the
Tenant in any such event (described in (a) or (b) above) Landlord shall have the
right to do once or more often any or more of the following:

                           (i) declare due and payable and bring appropriate
action to recover all unpaid rent and additional rent and all rent for the
unexpired term of this Lease, together with all costs and commissions provided
or permitted by law;

                           (ii) declare this Lease ended;

                                       10
<PAGE>

                           (iii) lease the leased space and parking lot to any
other person with or without first altering the leased space or parking lot;

                           (iv) avail itself of any other remedies permitted by
law.

         17. ZONING. Landlord represents that the Leased Space is in compliance
with all local and county zoning, and municipal Ordinances, rules, regulations,
and furthermore, that it has full and complete permission and approval to
provide and construct the additional 79 parking spaces as required under this
Lease, on or before march 1, 2000.

         18. EXCLUSIVE OPTION TO PURCHASE. For a period of one (1) year
following the Commencement Date (Option Period) hereunder Tenant shall have the
Exclusive Option to purchase the Leased Space being the building and land more
particularly described in Exhibit A hereto, as well as the Leased Property
referred to herein for the sum of Three Million Dollars 00/100 ($3,000,000.00)
certified funds at closing. Tenant may exercise this Option by giving written
notice to Landlord of its intent to exercise the Option within the Option
Period. Settlement shall be held no later than sixty (60) days following written
notice of Tenant/Option Holder's intent to exercise its option to purchase.
Landlord shall deliver before the settlement such Deeds and such other good and
sufficient instruments of conveyance and transfer, in form and substance
reasonably satisfactory to counsel for Tenant, as shall be effective to vest in
Tenant all of the Landlord's right, title and interest to the Leased Space and
property. Title to the real estate shall be such as will be insurable by a
reputable title insurance company in the Commonwealth of Pennsylvania at regular
rates. If required, Landlord shall comply with any and all bulk sales laws,
statutes and/or ordinances in the Commonwealth of Pennsylvania and shall execute
any and all documents and perform all acts required before and after Settlement
on the Tenants Exclusive Option to Purchase. Landlord shall not market or offer,
directly or indirectly the Leased Space and Property for sale to any other third
parties during the Option Period.

         19. RIGHT OF FIRST REFUSAL. After the first year of this Lease (after
which Tenant's right to exercise its Exclusive Option to Purchase shall lapse,)
and during the remaining five (5) years of the Term and/or the Additional Term,
if any Tenant shall have the right of first refusal. If at any time during the
second through sixth years of the Term (and/or during the Additional Term, if
any) Landlord shall receive a bona fide offer in writing ("Offer") from any
person, firm or corporation to purchase the real property and building which
contains the Leased Space, which Offer is acceptable to Landlord, Landlord shall
send Tenant a copy of the offer notifying Tenant of Landlord's intention to
accept the same. Tenant shall have the right within one week to elect to
purchase the property in its own name or in the name of a nominee on the same
terms and conditions set forth in the Offer. If the Tenant elects not to
purchase the property within said period, Landlord may then sell the property to
the said prospective buyer provided the sale is in the same terms and conditions
and for the same price as set forth in the Offer.

                                       11
<PAGE>

         20. DAMAGE TO OR DESTRUCTION OF IMPROVEMENTS. In the event of any
damage or loss to the leased space by reason of fire or other casualty, Tenant
shall give immediate notice thereof to Landlord. If the leased space is
partially or completely damaged or destroyed by fire or other casualty, Landlord
shall promptly and with all due diligence commence to fully repair or replace
the leased space. Tenant shall not be liable for any rent or additional rent
hereunder for any period during which Tenant cannot, in Tenant's reasonable
discretion, operate its business fully in the Leased Space. Landlord shall
maintain in full force and effect with respect to the building within which the
leased space is part, fire and extended casualty coverage insurance in amounts
for the full insurable value thereof and sufficient to rebuild the premises.

         21. ASSIGNMENT. Tenant shall be free to assign this Lease and/or
Exclusive Option to Purchase and any and all rights hereunder, to any related or
affiliated entity including, without limitation, any parent, subsidiary, merged
corporation or entity having any common ownership with Tenant. Tenant shall have
the absolute right, subject to zoning and use restrictions to sublease any and
all portions of the Leased Space to any entity or individual consistent with the
business purpose and objectives of Tenant.

         22. LANDLORD DUTY TO MITIGATE. Landlord shall have a duty to mitigate
all its damages hereunder.

         23. CONDEMNATION. In the event that the leased space, the parking lot
or any part thereof shall be acquired or condemned by eminent domain for any
public or quasi-public use, Tenant reserves unto itself, all rights to any
awards that may be payable to Tenant under the terms of the Eminent Domain Code
of the Commonwealth of Pennsylvania.

              Forthwith upon receipt by Landlord or Tenant of any notice of the
institution of any proceeding for the taking of the leased space or parking lot,
the party receiving such notice shall promptly give written notice thereof to
the other party.

         24. NON-WAIVER OF DEFAULT. No delay or omission by Landlord or Tenant
in exercising any right upon any default by the other will impair any such right
or be construed as a waiver of any such default.

         25. REMEDIES CUMULATIVE. All remedies available to Landlord and Tenant
hereunder, at law and in equity, shall be cumulative and concurrent. Neither the
termination of this Lease, nor the taking or recovering possession of the leased
space and parking lot shall deprive Landlord of any remedies or actions against
Tenant for rent or for damages for the breach of any covenant or condition
contained herein, nor shall the bringing of any action for rent or for damages,
nor the resort to any other remedy for the recovery of rent or damages, be
construed as a waiver or release of the right to obtain possession.

         26. With regard to the obligation of the parties hereunder, time shall
be of the essence.

                                       12
<PAGE>

         27. QUIET ENJOYMENT. Landlord covenants and agrees that, upon Tenant's
payment of rent, and its observance and performance of the terms, covenants and
conditions on Tenant's part to be observed and performed under the Lease, Tenant
may peaceably and quietly enjoy the leased space and parking lot for the term of
this Lease. Landlord shall be liable for any interference with Tenant's business
or use of the parking lot.

         28. END OF TERM. This Lease shall expire and terminate at the end of
the Term hereof or at the end of any Additional Term or sooner as provided
herein. Should Tenant continue to occupy the leased space and parking lot after
expiration of the term of this Lease or any renewal or extension hereof, or
after a forfeiture incurred, such tenancy shall (without limiting any of
Landlord's right or remedies therefor) be one at sufferance from month to month
at a minimum monthly rental equal to twice the rent payable for the last month
of the last term of the Lease.

         29. It is expressly represented that Colliers Lanard & Axilbund, Inc.
are the only brokers involved in this Agreement and that any and all commission
to them shall be paid by Landlord.

         30. ENTIRE AGREEMENT. All of the parties have read this Lease carefully
and understand it fully. The parties to these agreements state that they are
represented, and have sought the advise of legal counsel. The parties expressly
agree and understand that this Lease sets forth all of the promises, agreements,
conditions, inducements and understandings relative to the Leased Space and
parking lot, and there are no promises, agreements, conditions, inducements or
understandings, either oral or written other than are herein set forth.

         31. PARTIES BOUND. All rights and liabilities given to, or imposed
upon, the parties to this Lease shall extend to and bind the several and
respective heirs, executors, administrators, successors and assigns of such
parties hereunder. Notices must be given by certified mail and shall be given at
the addresses listed below or to such other address as either party may in
writing give to the other from time to time:

                  To the Landlord:

                  ISK Magnetics, Inc.
                  C/O ISK Americas, Incorporated
                  7474 Auburn Road
                  P.O. Box 759
                  Concord, Ohio 44077-0759

                  To Tenant:

                  FASTNET Corporation
                  Two Courtney Place

                                       13
<PAGE>

                  Suite 130
                  3864 Courtney Street
                  Bethlehem, Pennsylvania 18017

                  With a copy to:

                  George S. Kounoupis, Esquire
                  Hahalis & Kounoupis, P.C.
                  3400 Bath Pike, Suite 100
                  Bethlehem, Pennsylvania 18017

         32. PARTIALLY INVALIDITY. If any term or provision of this Lease or the
application thereof to any person or circumstance shall, to any extent, be
invalid or unenforceable, the remainder of this Lease and the application of
such term or provision to persons or circumstances other than those as to which
it is held invalid or unenforceable, shall not be affected thereby, and each
term and provision of this Lease shall be valid and be enforceable to the
fullest extent permitted by law.

         33. HEADINGS. Any headings preceding the text of the various Sections
and Subsections hereof are inserted solely for the convenience of reference and
shall not constitute a part of this Lease, nor shall they affect its meaning,
construction or effect.

         34. MODIFICATIONS. The terms and conditions of this Lease shall not be
modified or changed in any way except by writing signed by Landlord and Tenant.

         35. RECORDING. Tenant may not record this Lease or a memorandum hereof
without the written approval of Landlord.

                                       14
<PAGE>

         IN WITNESS WHEREOF, the parties have caused this Lease to be duly
executed the day and year first above written.

                                       LANDLORD:
                                       ISK MAGNETICS, INC.

----------------------------           ---------------------------------
Attest                                 Franklin S. Barry, Jr., Chairman

                                       TENANT:
                                       FASTNET CORPORATION

                                       By:
----------------------------           ---------------------------------
Attest                                       EVP OPERATIONS

                                       15

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