Document:

EX-10..1

SECOND AMENDMENT TO LEASE AGREEMENT

THIS SECOND AMENDMENT is made this Sixteenth day of June, 2005, by and between LIBERTY
PROPERTY LIMITED PARTNERSHIP, a Pennsylvania limited partnership (“Landlord”), and VERTICALNET,
INC., a Pennsylvania corporation (“Tenant”).

BACKGROUND:

A. Landlord and Aatlas Commerce, Inc., a Delaware corporation (“Aatlas”), entered into a Lease
Agreement dated January 12, 2000 (the “Original Lease”), as amended by First Amendment to Lease
Agreement dated April 13, 2000 (the “First Amendment”), covering premises containing approximately
4,772 rentable square feet (the “Original Space”) known as Suite 120 located in Landlord’s building
(the “Building”) at 400 Chesterfield Parkway, Malvern, Pennsylvania, as more fully described in the
Original Lease.

B. Aatlas changed its name to Atlas Commerce, Inc. (“Atlas”).

C. Pursuant to the terms of a certain Agreement Assigning and Terminating Lease Agreements and
Releasing Parties dated January 16, 2003 by and among Landlord, Tenant and Atlas (the “Assignment
and Termination Agreement”), Atlas assigned all of its right, title and interest in the Original
Lease and the First Amendment to Tenant and the Original Lease and First Amendment were further
amended (the Original Lease, as amended by the First Amendment and the Assignment and Termination
Agreement, is hereinafter referred to collectively as the “Lease”).

D. Pursuant to the Assignment and Termination Agreement, the Lease was to be terminated on or
before May 31, 2003 (the “Termination Date”), subject to the right of Tenant to extend the
Termination Date on a quarterly basis thereafter.

E. Tenant has extended the Termination Date to August 31, 2005.

F. Tenant desires to increase the amount of space leased in the Building and to extend the
term of the Lease and Landlord has agreed to such increase and extension subject to the provisions
of this Second Amendment.

G. Landlord and Tenant have agreed that, in order to satisfy Tenant’s space needs, Tenant will
be required to vacate the Original Space and lease other space in the Building.

H. Accordingly, Landlord and Tenant desire to amend the Lease.

NOW, THEREFORE, the parties hereto, in consideration of the mutual promises and covenants
contained herein and in the Lease, and intending to be legally bound hereby, agree that the Lease
is amended as follows:

1. All capitalized terms used herein and not otherwise defined herein shall have the meanings
ascribed to them in the Lease.

2. Landlord hereby agrees to lease to Tenant and Tenant hereby agrees to lease from Landlord
Suite 120 of the Building containing approximately 7,947 rentable square feet, as more fully
described in Exhibit “A” attached hereto (the “Relocation Space”), on the terms set forth in this
Second Amendment. Within fifteen (15) days following the Effective Date (as hereinafter defined),
Landlord’s architect shall measure the Relocation Space and determine the rentable area of the
Relocation Space. In the event that the rentable area of the Relocation Space so determined shall
vary from that set forth in this paragraph 2, then (i) all amounts set forth in this Second
Amendment based upon the rentable area of the Premises (including without limitation the monthly
and annual Minimum Rent, Estimated Annual Operating and Electrical Expenses and Tenant’s
Proportionate Share) shall be appropriately adjusted, and (ii) Landlord and Tenant shall execute an
amendment or other written agreement setting forth the revised rentable area of the Premises and
such adjustments.

3. Landlord shall, at its sole cost and expense (except as expressly otherwise set forth in
this Section 3), complete the Relocation Space in accordance with the plan of improvements and
scope of work attached as Exhibit “B” and the specifications attached as Exhibit “C”. Such
improvements shall be completed at Landlord’s cost and expense, except that back-up power
generation, supplemental HVAC and Tenant’s voice/data/security installation shall be performed by
Tenant at Tenant’s sole cost and expense. All necessary construction shall be substantially
completed and ready for use and occupancy by Tenant on the date that is five (5) weeks after
Landlord’s receipt of a building permit for such work, subject to extension for delays due to any
cause beyond the reasonable control of Landlord or Landlord’s contractors or suppliers. All
construction shall be performed in a good and workmanlike manner and shall comply at the time of
completion with all applicable Laws and Requirements of the governmental authorities having
jurisdiction. The Relocation Space shall be deemed to be substantially complete when a certificate
of occupancy for the Relocation Space has been issued by the appropriate governmental authority (if
required) and all improvements to be made by Landlord pursuant to this Second Amendment have been
completed, except for mutually agreed-upon punch-list items. Notwithstanding anything to the
contrary set forth in this Section 3, costs incurred by Landlord to replace the existing carpet and
vinyl cove base in two (2) private offices and two (2) conference rooms and to install carpet and
vinyl cove base over the existing vinyl flooring in one (1) storage room, as shown on Exhibit “B”,
together with interest on such costs at the rate of 10% per annum, shall be amortized over the
extended Term of the Lease and such amounts shall be paid by Tenant, as additional rent, in equal
monthly installments at the time and in the manner set forth in the Lease for payment of Minimum
Annual Rent. New carpet and vinyl cove base shall be similar to the existing carpet and base in
other areas of the Relocation Space and is specified in Exhibit “C”.

4. Upon the Effective Date (as hereinafter defined), Tenant shall vacate and surrender the
Original Space (except for the portion thereof constituting a part of the Relocation Space) to
Landlord, leaving it in the condition it is required to be surrendered under the Lease.

5. Upon the Effective Date (as hereinafter defined), Section 1(a) of the Lease defining
“PREMISES” is amended by deleting the references to “4,772” approximate rentable square feet and
“Suite 120” and inserting “7,947” and “Suite 120” in its place.

6. Section 1(c) of the Lease defining “TERM” is amended to extend the Term until the
Expiration Date set forth in paragraph 7 below.

7. Section 1(c)(ii) of the Lease defining “EXPIRATION DATE” is amended to extend the
Expiration Date to the date which is sixty (60) months after the first day of the first full
calendar month after the Effective Date (as hereinafter defined).

8. Effective on the date (the “Effective Date”) which is the earlier of (a) the date of
substantial completion of the Relocation Space, or (b) the date Tenant occupies the Relocation
Space, the amount of the Minimum Annual Rent and the amount of the monthly installments under
Section 1(d)(i) of the Lease defining “MINIMUM ANNUAL RENT” are deleted and the following are
substituted therefor:

	 	 	 	 	 	 	 	 	 	 	 	 	 
	Relocation Space

Lease Year

	 	

Per Rentable Square

Foot Per Year
	 	

Annual
	 	

Monthly

	 

	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	1

	 	$	8.91	 	 	$	70,807.80	 	 	$	5,900.65	 
	 

	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	2

	 	$	9.41	 	 	$	74,781.24	 	 	$	6,231.77	 
	 

	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	3

	 	$	9.91	 	 	$	78,754.80	 	 	$	6,562.90	 
	 

	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	4

	 	$	10.41	 	 	$	82,728.24	 	 	$	6,894.02	 
	 

	 	 	 	 	 	 	 	 	 	 	 	 
	 
	 	 	 	 	 	 	 	 	 	 	 	 
	5

	 	$	10.91	 	 	$	86,701.80	 	 	$	7,225.15	 
	 

	 	 	 	 	 	 	 	 	 	 	 	 

For purposes hereof, a Relocation Space Lease Year shall mean the period from the Effective
Date through the succeeding 12 full calendar months (including for the first Relocation Space Lease
Year any partial month from the Effective Date until the first day of the first full calendar month
thereafter) and each succeeding 12 month period thereafter during the Term.

9. Effective on the Effective Date, Section 1(d)(ii) of the Lease defining “ANNUAL OPERATING
AND ELECTRICAL EXPENSES” is deleted in its entirety and the following is substituted therefor:

“(ii) Estimated ‘ANNUAL OPERATING AND ELECTRICAL EXPENSES’: $64,764.00 (Sixty-Four Thousand
Seventy Hundred Sixty-Four and 00/100 Dollars), payable in monthly installments of $5,397.00 (Five
Thousand Three Hundred Ninety-Seven and 00/100 Dollars), subject to adjustment (§7(a)).”

“Estimated ‘ANNUAL ELECTRICAL EXPENSES’: $38,172.00 (Thirty-Eight Thousand One Hundred
Seventy-Two and 00/100 Dollars), payable in monthly installments of $3,181.00 (Three Thousand One
Hundred Eighty-One and 00/100 Dollars), subject to adjustment and reconciliation based upon actual
readings of the submeter measuring electric usage in the server room of the Premises and based upon
Tenant’s Proportionate Share of actual electric consumption for the Building, including the portion
of the Premises other than the server room, and the Common Areas.”

10. Effective on the Effective Date, Section 1(e) of the Lease defining “PROPORTIONATE SHARE”
is amended by deleting the reference to “20%” and inserting “34.37%” in its place.

11. Tenant and its Agents shall have the right, at Tenant’s own risk, expense and
responsibility, at all reasonable times during the period commencing two (2) weeks prior to the
Effective Date, to enter the Relocation Space for the purpose of taking measurements and installing
its furnishings and equipment, provided that Tenant does not interfere with or delay the work to
be performed by Landlord, Tenant uses contractors and workers compatible with the contractors and
workers engaged by Landlord, and Tenant obtains Landlord’s prior written consent.

12. Landlord shall confirm the Effective Date and the Expiration Date by executing a
relocation space commencement certificate in the form attached as Exhibit “D”.

13. Sections 37, 38, 41 and 42 of the Lease are hereby deleted in their entirety.

14. Effective on the Effective Date, Sections 14, 15, 16 and 17 of the Assignment and
Termination Agreement and, as to the Lease only, Section 20 thereof, shall be null and void and of
no further force or effect.

15. Provided that Landlord has not given Tenant notice of default more than two (2) times
after the Effective Date and that there then exists no event of default by Tenant under the Lease
nor any event that with the giving of notice and/or the passage of time would constitute a default,
Tenant shall have the right and option, exercisable by giving Landlord a minimum of nine (9) months
prior written notice thereof, to terminate the Lease at the expiration of the thirty-sixth (36th)
full month after the Effective Date and by paying Landlord at the time of giving such notice an
amount equal to (a) Twenty-Six Thousand Two Hundred Sixty-Four Dollars ($26,264.00) plus (b) the
unamortized cost of the carpet and vinyl cove base referred to in paragraph 3 above. Tenant shall
pay all Rent under the Lease and abide by all of the terms and conditions of the Lease through and
including such early termination date. This paragraph 15 and the rights granted to Tenant
hereunder shall automatically become null and void and of no further force or effect upon (a)
Landlord and Tenant entering into an agreement to expand or reduce the number of rentable square
feet leased under this Lease, or (b) Landlord’s receipt of written notice from Tenant exercising
Tenant’s rights under paragraph 16 below.

16. (a) Provided that Landlord has not given Tenant notice of default more than two (2) times
after the Effective Date and that there then exists no event of default by Tenant under the Lease
nor any event that with the giving of notice and/or the passage of time would constitute a default,
Tenant shall be entitled to exercise the rights set forth below in this paragraph 16.

(b) If at any time during the term of this Lease Tenant desires to lease at least 35% more
square footage than is then leased by Tenant under the Lease and such additional space is not
available in the Building and Tenant enters into a lease with Landlord for such larger space in any
of Landlord’s buildings in Great Valley Corporate Center or the Wayne/King of Prussia submarkets,
Landlord agrees that, at Tenant’s request, Landlord will enter into an agreement with Tenant to
terminate the Lease as of the commencement date of the lease for the larger space. Tenant shall
comply with all the terms and conditions of the Lease through the Termination Date; thereafter
neither party shall have any further rights or obligations under the Lease other than any
obligations of Tenant or Landlord which by their terms survive the expiration or earlier
termination of the Lease, including, without limitation, Tenant’s and Landlord’s obligation as
required under Section 7(a) of the Lease entitled “Payment of Operating Expenses”.

(c) Tenant may notify Landlord in writing at any time during the Term that Tenant wishes to
lease such larger amount of space. Landlord shall search its inventory of vacant office space at
that time in the Great Valley Corporate Center or Wayne/King of Prussia submarkets, and shall
determine whether it has vacant office space, not then committed to a particular tenant or under
negotiation to a particular tenant or other prospect, that would be suitable for Tenant’s office
needs as made known to Landlord at that time. Landlord shall respond to Tenant’s notice, within 10
business days after receipt of Tenant’s notice, by either identifying the vacant space in buildings
that it owns that could be made available to Tenant, or advising Tenant that is currently has no
space of the necessary size available.

(d) If Landlord’s notice indicates that particular space is available, then Landlord shall
promptly meet with Tenant to inspect the available space. Landlord and Tenant shall then negotiate
the proposed terms and conditions for the lease of the proposed new space which shall require,
inter alia, a minimum five (5) year term, without an early termination option,
Minimum Annual Rent at a market rate, but in any event not less than the rates payable hereunder
from time to time during the remaining Term of the Lease, and other market terms. The parties
shall at that time sign a new lease, or a lease amendment, that reflects the terms of the new
arrangement that has been negotiated. Construction and occupancy will then take place as set out
in that new lease or amendment.

(e) If Landlord has no comparable space available, then Landlord shall so notify Tenant, and
Landlord shall have no further obligation with respect to Tenant’s notice. Absent a request,
Landlord shall not have the affirmative obligation to search its inventory for comparable space for
Tenant every time such space becomes available; however, Landlord may on its own initiative notify
Tenant in writing when and if any such comparable space becomes available, and if Tenant is
interested in such space in its sole discretion, then thereafter the procedure shall be as provided
in subparagraph (d) above. Notwithstanding the above, Tenant may inquire from time to time as to
the availability of additional space within Landlord’s portfolio of property.

(f) This right to request relocation is a one-time right if and when exercised by Tenant, is
personal to Tenant and is non-transferable to any assignee or sublessee (regardless of whether any
such assignment or sublease was made with or without Landlord’s consent) or other party.

(g) This paragraph 16 and the rights granted to Tenant hereunder shall automatically become
null and void and of no further force or effect upon Landlord’s receipt of written notice from
Tenant exercising its option of early termination pursuant to paragraph 16 above.

17. The parties agree that they have dealt with no brokers in connection with this Second
Amendment, except for CB Richard Ellis, Inc., whose commission shall be paid by Landlord pursuant
to separate agreement. Each party agrees to indemnify and hold the other harmless from any and all
claims for commissions or fees in connection with the Relocation Space and this Second Amendment
from any other real estate brokers or agents with whom they may have dealt.

18. Tenant acknowledges and agrees that the Lease is in full force and effect and Tenant has
no claims or offsets against Rent due or to become due hereunder.

19. Except as expressly modified herein, the Lease shall remain in full force and effect in
accordance with its terms. Specifically, without limitation, in the event of any default by Tenant
of any of its obligations under the Lease, as hereby amended, Landlord may pursue all remedies
available under the Lease or otherwise at law or in equity. Accordingly, Tenant agrees to the
following:

(a) When the Lease, as hereby amended, and the Term or any extension thereof shall have been
terminated on account of any default by Tenant, or when the Term or any extension thereof shall
have expired, Tenant hereby authorizes any attorney of any court of record of the Commonwealth of
Pennsylvania to appear for Tenant and for anyone claiming by, through or under Tenant and to
confess judgment against all such parties, and in favor of Landlord, in ejectment and for the
recovery of possession of the Premises, for which the Lease, as hereby amended, or true and correct
copies thereof shall be good and sufficient warrant. AFTER THE ENTRY OF ANY SUCH JUDGMENT A WRIT
OF POSSESSION MAY BE ISSUED THEREON WITHOUT FURTHER NOTICE TO TENANT AND WITHOUT A HEARING. If for
any reason after such action shall have been commenced it shall be determined and possession of the
Premises remain in or be restored to Tenant, Landlord shall have the right for the same default and
upon any subsequent default(s) or upon the termination of the Lease or Tenant’s right of possession
as herein set forth, to again confess judgment as herein provided, for which the Lease, as hereby
amended, or true and correct copies thereof shall be good and sufficient warrant.

(b) If Tenant shall default in the payment of the Rent due hereunder and such default shall
continue beyond applicable notice and/or cure periods herein contained, Tenant hereby authorizes
any attorney of any court of record of the Commonwealth of Pennsylvania, upon an additional five
(5) days’ prior written notice to Tenant, to appear for Tenant and to confess judgment against
Tenant, and in favor of Landlord, for all sums due hereunder plus interest, costs and an attorney’s
collection commission equal to the greater of 10% of all such sums or $1,000, for which the Lease,
as hereby amended, or true and correct copies thereof shall be good and sufficient warrant. TENANT
UNDERSTANDS THAT THE FOREGOING PERMITS LANDLORD TO ENTER A JUDGMENT AGAINST TENANT WITHOUT PRIOR
WRITTEN NOTICE OR HEARING. ONCE SUCH A JUDGMENT HAS BEEN ENTERED AGAINST TENANT, ONE OR MORE WRITS
OF EXECUTION OR WRITS OF GARNISHMENT MAY BE ISSUED THEREON WITHOUT FURTHER NOTICE TO TENANT AND
WITHOUT A HEARING, AND, PURSUANT TO SUCH WRITS, LANDLORD MAY CAUSE THE SHERIFF OF THE COUNTY IN
WHICH ANY PROPERTY OF TENANT IS LOCATED TO SEIZE TENANT’S PROPERTY BY LEVY OR ATTACHMENT. IF THE
JUDGMENT AGAINST TENANT REMAINS UNPAID AFTER SUCH LEVY OR ATTACHMENT, LANDLORD CAN CAUSE SUCH
PROPERTY TO BE SOLD BY THE SHERIFF EXECUTING THE WRITS, OR, IF SUCH PROPERTY CONSISTS OF A DEBT
OWED TO TENANT BY ANOTHER ENTITY, LANDLORD CAN CAUSE SUCH DEBT TO BE PAID DIRECTLY TO LANDLORD IN
AN AMOUNT UP TO BUT NOT TO EXCEED THE AMOUNT OF THE JUDGMENT OBTAINED BY LANDLORD AGAINST TENANT,
PLUS THE COSTS OF THE EXECUTION. Such authority shall not be exhausted by one exercise thereof,
but judgment may be confessed as aforesaid from time to time as often as any of said rental and
other sums shall fall due or be in arrears, and such powers may be exercised as well after the
expiration of the initial term of the Lease and during any extended or renewal term of the Lease
and after the expiration of any extended or renewal term of the Lease.

(c) The warrants to confess judgment set forth above shall continue in full force and effect
and be unaffected by amendments to the Lease or other agreements between Landlord and Tenant even
if any such amendments or other agreements increase Tenant’s obligations or expand the size of the
Premises. Tenant waives any procedural errors in connection with the entry of any such judgment or
in the issuance of any one or more writs of possession or execution or garnishment thereon.

(d) TENANT KNOWINGLY AND EXPRESSLY WAIVES (i) ANY RIGHT, INCLUDING, WITHOUT LIMITATION, UNDER
ANY APPLICABLE STATUTE, WHICH TENANT MAY HAVE TO RECEIVE A NOTICE TO QUIT PRIOR TO LANDLORD
COMMENCING AN ACTION FOR REPOSSESSION OF THE PREMISES AND (ii) ANY RIGHT WHICH TENANT MAY HAVE TO
NOTICE AND TO HEARING PRIOR TO A LEVY UPON OR ATTACHMENT OF TENANT’S PROPERTY OR THEREAFTER.

20. Notwithstanding anything in subsections 20(a) and (b) above to the contrary, Landlord will
provide fifteen (15) days prior written notice prior to obtaining a writ of possession or writ of
execution and Tenant is entitled to written notice of the entry of the judgment entered by
confession, and thereafter thirty (30) days to respond, or as otherwise permitted by law.

21. This Second Amendment shall be binding upon and inure to the benefit of the parties and
their respective successors and permitted assigns.

1

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

LANDLORD:

LIBERTY PROPERTY LIMITED PARTNERSHIP

	 	 	 	 	 
	By:	 	Liberty Property Trust, Sole General Partner

	 
	 	 	 	 
	
 
	 	By:
	 	/s/ James J. Mazzarelli, Jr.
	
 
	 	 	 	 
	
 
	 	 	 	Name: James J. Mazzarelli, Jr.

Title: Senior Vice President, City Manager

	 	 	 	TENANT:

VERTICALNET, INC.

By: /s/ Gene S. Godick

	 	 	 	Name: Gene S. Godick

Title: Executive Vice President and Chief Financial Officer

2

EXHIBIT “A”

PLAN SHOWING RELOCATION SPACE

TO BE ATTACHED

3

EXHIBIT “B”

PLAN OF RELOCATION SPACE IMPROVEMENTS AND SCOPE OF WORK

TO BE ATTACHED

4

EXHIBIT “C”

RELOCATION SPACE SPECIFICATIONS

TO BE ATTACHED

5

EXHIBIT “D”

RELOCATION SPACE COMMENCEMENT CERTIFICATE

VerticalNet, Inc.

400 Chesterfield Parkway

Malvern, PA 19355

	 	 	 
	RE:

	 	Second Amendment to Lease Agreement For Premises located at

400 Chesterfield Parkway, Malvern, Pennsylvania

Between Liberty Property Limited Partnership, as Landlord, and

VerticalNet, Inc., as Tenant

This is to confirm the following with respect to the Second Amendment to Lease Agreement (the
“Lease Amendment”):

	 	 	 	 	 
	1.

2.

3.

	 	Date of Lease Amendment:

Effective Date:

Expiration Date:
	 	     , 2005

     , 2005

     , 2010

4. Rent and operating expenses due on or before the Effective Date for the period from the
Effective Date until the first day of the next calendar month (Not applicable if the Effective Date
is the first day of the calendar month):

	 	 	 	 	 
	Minimum Annual Rent:
	 	$	—	 
	Annual Operating Expenses:
	 	$	—	 
	TOTAL:
	 	$	—	 

Thereafter regular monthly payments due in the following amounts until adjusted in accordance
with the Lease Amendment:

	 	 	 	 	 
	Monthly Rent Installment:
	 	$	—	 
	Monthly Operating Payment:
	 	$	—	 
	TOTAL MONTHLY PAYMENT:
	 	$	—	 

6

If you disagree with any of the information set forth above, please advise us in writing
within five days of your receipt of this letter; otherwise the Effective Date and the Expiration
Date of the Lease will be as set forth above.

Sincerely,

LANDLORD:

LIBERTY PROPERTY LIMITED PARTNERSHIP

	 	 	 	 	 	 	 	 	 
	By:	 	Liberty Property Trust, Sole General Partner

	 
	 	By:                               
	 	 	—	 
	 
	 	 	 	 	 	Name: James J. Mazzarelli, Jr.

	 
	 	 	 	 	 	Title: Senior Vice President, City Manager

7EX-10.81

EXHIBIT 10.81

SUMMARY OF 2005 ANNUAL PERFORMANCE OBJECTIVES

FOR EXECUTIVE OFFICERS

On June 17, 2005, the Compensation Committee of the Board of Directors approved the annual
performance objectives that will be used to determine the annual incentive awards which may be
granted to the Company’s executive officers (other than James R. Mellor, the Company’s Chairman and
Chief Executive Officer) under the Company’s annual incentive program under the USEC Inc. 1999
Equity Incentive Plan for the 2005 fiscal year. Annual incentives may be paid partly in cash and
partly in stock and are linked to corporate and individual performance. The Compensation Committee
determined that the annual incentive in 2005 would be based on a combination of formula-based
Company financial goals and individual performance. The Company financial goals for 2005 involve
the achievement of a targeted net income and a targeted cash flow from operations. The individual
performance goals are comprised of individual key performance objectives to be established by
senior management and approved by the Chief Executive Officer with respect to each of the other
executive officers, and the officer’s demonstrated leadership, initiative, coordination and
cooperation.

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