AGREEMENT OF SALE AND PURCHASE

         THIS  AGREEMENT OF SALE AND PURCHASE  (the  "Agreement")  is made as of
this  28th day of  February,  1996,  by and  between  ADWIN  REALTY  COMPANY,  a
Pennsylvania corporation and LBA ASSOCIATES, a Pennsylvania general partnership,
having an address at 300 Stevens  Drive,  Lester,  PA  19113-1521  (collectively
referred to herein as  "Seller")  and J. BRIAN  O'NEILL,  OR HIS  NOMINEE(S)  OR
ASSIGNEE(S),  having a  business  address  c/o 443  South  Gulph  Road,  King of
Prussia, PA 19406 ("Buyer").

                              W I T N E S S E T H:

         In consideration of the covenants and provisions  contained herein, the
parties agree as follows:

         1. Agreement to Sell and Purchase.  Seller agrees to sell to Buyer, and
Buyer agrees to purchase from Seller, subject to all of the terms and conditions
of this Agreement,  certain  property  located at 1400 Providence  Road,  Media,
Delaware County, Pennsylvania, consisting of the following:

                  (a) Real  Property.  That  certain  tract of land  more  fully
described  by metes  and  bounds on  Exhibit  "A" to this  Agreement  containing
approximately thirteen (13) acres in area, identified on the Delaware County Tax
Map as  Folio  Nos.  35-00-01465-00  and  35-00-00806-  00,  together  with  all
improvements thereon including, without limitation, the two (2) office buildings
containing  approximately 259,746 net leasable square feet in the aggregate, and
all  appurtenances  thereto  (including,   without  limitation,  all  easements,
rights-of-way,  water rights,  mineral and timber  rights,  development  rights,
privileges,  licenses,  and other rights and benefits belonging to, running with
the owner  of, or in any way  relating  to the  aforesaid  tract of land and all
trees,  shrubbery and plants,  and rights to growing  crops);  together with all
rights,  title and interest of Seller in and to any land lying in the bed of any
street,  opened or proposed,  in front of or abutting or adjoining the aforesaid
tract of land, and all right,  title and interest of Seller in and to any unpaid
award for the taking by  eminent  domain of any part of the  aforesaid  tract of
land or for  damage to such  tract of land by reason of a change of grade of any
street (collectively, the "Real Property").

                  (b) Personal  Property.  All fixtures,  furniture,  equipment,
supplies,  stock for  completion  of  tenant  improvements  and  other  personal
property  attached or appurtenant to, or located in or on, or used in connection
with the Real  Property  which are not owned by  tenants  of the Real  Property,
together with all intangible personal property used in the ownership,  operation
or maintenance of the Real Property including, without limitation, the items set
forth on Exhibit "B" to this Agreement (collectively,  the "Personal Property"),
but   excluding   the  items  set  forth  on  Exhibit  "C"  of  this   Agreement
(collectively, the "Excluded Items of Personal Property").

                  (c) Property.  The Real Property and the Personal Property are
sometime collectively referred to as the "Property".

         2.  Purchase Price.

                  (a) Amount and Method of Payment.  The purchase  price for the
Property (the  "Purchase  Price"),  subject to  adjustments  as provided in this
Agreement,   shall  be  Twenty-Two   Million  Five  Hundred   Thousand   Dollars
($22,500,000.00), and shall be paid as follows:

                           (i) One Hundred Fifty Thousand Dollars  ($150,000.00)
(the  "Deposit") is being paid upon execution of this Agreement by Buyer's plain
check drawn to the order of the Title  Company  selected  by Buyer (the  "Escrow
Agent" ).  Seller  acknowledges  the  delivery  by Buyer to the Escrow  Agent of
Buyer's check for the Deposit.  As used in this  Agreement,  the term  "Deposit"
shall  refer to any sums then paid by Buyer to Escrow  Agent on  account  of the
Purchase Price. The Deposit shall be held by the Escrow Agent in one (1) or more
federally-insured interest bearing accounts acceptable to both Seller and Buyer,
or in short-term  United States  Government  obligations  having a maturity date
which is not later than the Closing Date (as hereinafter defined).  The taxpayer
identification  number for Adwin Realty  Company is 23-1706179  and the taxpayer
identification number for LBA Associates is 23-2534044;  Buyer's social security
number is ###-##-####.

                           (ii) The balance of the Purchase  Price shall be paid
at the  Closing  (as  hereinafter  defined)  by  wire  transfer  of  immediately
available funds as directed by Seller.

         3.  Disposition of Deposit; Defaults.

                  (a) Held in Escrow.  The  Deposit  shall be held in escrow and
disbursed  by the Escrow  Agent  strictly in  accordance  with the terms of this
Agreement.

                  (b) Upon Default.

                           (i)  If  Buyer,  without  the  right  to do so and in
default of its obligations under this Agreement,  fails to complete the Closing,
Seller  shall have the right to be paid the Deposit and all  interest  earned on
the Deposit as  liquidated  damages.  The right of Seller to be paid the Deposit
plus interest  thereon shall be Seller's  exclusive and sole remedy,  and Seller
hereby  waives any right to recover the balance of the  Purchase  Price,  or any
part  thereof,  and the right to pursue any other remedy  permitted by law or in
equity against Buyer. Notwithstanding anything to the contrary contained in this
Paragraph  3(b), the Escrow Agent shall not pay the Deposit to Seller under this
Paragraph  3(b) until the earlier to occur of (A) receipt by the Escrow Agent of
written joint  instructions  from Seller and Buyer,  or (b) entry of a final and
unappealable  adjudication determining which party is entitled to receive all or
part of the Deposit.

                           (ii) If  Seller,  without  the  right to do so and in
default of its obligations  under this Agreement,  fails to complete the Closing
or otherwise  defaults  under or breaches  this  Agreement,  Buyer,  as its sole
remedies, shall have the right to be paid the Deposit and all interest earned on
the  Deposit  together  with the  amount of all  charges  incurred  by Buyer for
searching  title,  the cost of any  plans,  surveys  and  environmental  studies
ordered by Buyer and all other  reasonable  fees costs and expenses  incurred by
Buyer in connection with the Property and Buyer's intended  acquisition  thereof
in the maximum amount of Fifty Thousand Dollars ($50,000.00) (the "Reimburseable
Costs"),  together with the right to specific performance and injunctive relief.
Upon payment to Buyer of the Reimburseable  Costs, Buyer shall provide a copy of
such plans, surveys and reports to Seller (and to the extent assignable, provide
an assignment of same).

                  (c) Upon Closing or  Termination  by Buyer.  If the Closing is
completed  hereunder,  the Escrow  Agent shall pay the Deposit to Seller and all
interest earned on the Deposit to Buyer. If Buyer terminates this Agreement as a
result  of  Seller's  default  or  pursuant  to the  exercise  of any  right  of
termination  permitted  by this  Agreement,  upon the  earlier  to occur of: (i)
receipt by Escrow Agent of written joint  instructions  from Seller and Buyer or
(ii) entry of a final and unappealable  adjudication  determining which party is
entitled to receive the Deposit and interest thereto, as applicable, the Deposit
and all interest  thereon shall be distributed  in accordance  with such written
instructions or adjudication.

                  (d)  Dispute.  In the event of a dispute  between  the parties
with  respect to the  Deposit,  the Escrow  Agent may deposit the Deposit with a
court of  competent  jurisdiction  and  commence an  interpleader  action.  Upon
notifying Seller and Buyer of the commencement of such action,  the Escrow Agent
shall be released of all  liability  with respect to the Deposit,  except to the
extent of accounting for any monies previously delivered by the Escrow Agent out
of escrow. Escrow Agent shall not be liable to either Seller or Buyer other than
for the  performance  of its duties  under this  Agreement,  its  negligence  or
intentional  wrongdoing.  The  Escrow  Agent  may rely upon the  genuineness  or
authenticity of any document tendered to it by either of the parties,  and shall
be  under  no  duty  of  independent   inquiry  with  respect  to  any  acts  or
circumstances  recited  in such  documents.  Seller and Buyer  shall  indemnify,
defend and hold harmless the Escrow Agent from and against all costs,  claims or
liabilities  arising from the performance by the Escrow Agent of its obligations
under this Agreement, other than for its failure to comply herewith,  negligence
or intentional wrongdoing.

                  (e) Counsel as Escrow  Agent.  If the Escrow  Agent is counsel
for Seller or Buyer,  such counsel shall not be  disqualified or prohibited from
representing  its  client in  connection  with any  matter  arising  out of this
Agreement by reason of its capacity as the Escrow Agent.

         4.  Closing.

                  (a) Place of  Closing.  The  closing  and  settlement  of this
transaction  (the  "Closing")  shall take place at the offices of Adelman Lavine
Gold  and  Levin,  a  Professional  Corporation,  1900 Two  Penn  Center  Plaza,
Philadelphia, PA 19102-1799.

                  (b) Closing Date.  The Closing shall commence on or before the
date which is sixty (60) days after the expiration of the Inspection  Period (as
defined  herein) (the "Closing  Date").  On or before the initial  Closing Date,
Buyer shall have the right to extend the initial  Closing Date for an additional
forty-five  (45) days by  written  notice to  Seller,  provided  such  notice is
accompanied by Buyer's plain check drawn to the order of the Escrow Agent in the
amount of Fifty-Thousand Dollars ($50,000.00), which amount shall be held by the
Escrow Agent on account of the Purchase  Price and included in the total Deposit
tendered by Buyer under this Agreement.

         5.  Condition of Title.

                  (a) Title to Real  Property.  Title to the Real Property shall
be good and marketable and free and clear of all liens, restrictions, easements,
encumbrances,  leases,  tenancies  and other  title  objections,  except for the
Permitted  Encumbrances (as hereinafter defined), and shall be insurable as such
and as  provided in this  Agreement  at ordinary  rates by any  reputable  title
insurance  company selected by Buyer (the "Title  Company")  pursuant to an ALTA
Owner's Policy of Title  Insurance,  1992 Form B, amended  October 17, 1992 (the
"Owner's Policy of Title Insurance").  The term "Permitted  Encumbrances"  shall
mean the  Tenant  Leases  (as  hereinafter  defined)  and the items set forth on
Exhibit "D" to this Agreement.  The Owner's Policy of Title Insurance shall also
contain   endorsements   insuring  that  (i)  the   covenants,   conditions  and
restrictions  included in the Permitted  Encumbrances have not been violated and
that a future  violation  thereof  will not cause a  forfeiture  or reversion of
title; (ii) Buyer's  contemplated use of the Real Property as office building(s)
will not violate the  covenants,  conditions  and  restrictions  included in the
Permitted Encumbrances; (iii) if the Real Property consists of multiple parcels,
all such parcels  constitute a single,  contiguous tract; (iv) the Real Property
has direct access to Providence Road, and Kirk Lane,  publicly  dedicated roads;
and (v) the  existing  use of the Real  Property  complies  with all  applicable
zoning  ordinances and regulations as may affect the Real Property.  The premium
for the Owner's Policy of Title Insurance and such  endorsements will be paid by
Buyer.

                  (b) Title to Personal Property. Title to the Personal Property
shall be good and marketable and free and clear of all liens, security interests
and other  encumbrances.  Seller  shall pay at or before  the  Closing  all sums
required  to free  the  Personal  Property  of any  interest  of any  party  not
otherwise  permitted  under  this  Agreement  and shall  cause to be filed at or
before the  Closing  any  termination  statement,  release,  discharge  or other
document required to remove of record any encumbrance upon the Personal Property
held by any party.

                  (c) Commitment to Insure. Buyer hereby acknowledges and agrees
that Buyer will order a commitment  to insure with respect to the Real  Property
from the Title Company,  such commitment to certify that fee simple title to the
Real  Property  is vested in Seller,  and to commit to insure  title to the Real
Property as required by  Paragraph  5(a)  hereof.  If the  commitment  to insure
discloses that title to the Real Property is subject to any defect,  encumbrance
or other title objection other than the Permitted  Encumbrances,  or if Buyer is
unable to obtain such  commitment to insure,  Buyer shall have the right to give
to Seller  written  notice  specifying  such defect,  encumbrance or other title
objection,  or inability to obtain such  commitment to insure,  and Seller shall
use  reasonable  efforts to correct  such  defect,  encumbrance  or other  title
objection  (including the payment and satisfaction of monetary liens) and obtain
the commitment to insure from a reputable title insurance company  acceptable to
Buyer,  all by the date  which is the  later of (i) the  Closing  Date,  or (ii)
thirty (30) days following Buyer's notice specifying the defect.

                  (d)  Inability to Convey.  If Seller is unable to convey title
to the Real Property to Buyer at Closing in accordance with the  requirements of
this Agreement, or if a commitment to insure in accordance with the requirements
of this Agreement  cannot be obtained from the Title Company or other  reputable
title insurance company acceptable to Buyer, Buyer shall have the options (i) of
taking such title as Seller is able to convey  with  abatement  of the  Purchase
Price in the amount (fixed or  ascertainable) of any liens on the Real Property,
(ii) of terminating  Buyer's  obligations  under this Agreement and being repaid
the Deposit and all interest  earned  thereon,  this Agreement shall be null and
void and neither party shall have any obligations hereunder.

         6.  Possession.

                  (a)  Delivery  of  Possession.   Actual,  sole  and  exclusive
physical  possession  of the  Property  shall  be  given  to  Buyer  at  Closing
unoccupied and free of any leases, claims to or rights of possession, other than
the rights of tenants  under the Tenant  Leases,  by delivery of the keys to the
Property and Seller's  special  warranty deed, duly executed and acknowledged by
Seller and in proper form for recording (the "Deed"),  and Seller's bill of sale
in the form of Exhibit "E" to this Agreement duly executed and  acknowledged  by
Seller and in proper form for recording (the "Bill of Sale").  If Buyer causes a
survey of the Real Property to be made,  then at Buyer's option the  description
of the Real Property  contained in the Deed shall be based upon that survey.  It
is intended by the parties that the Real  Property  includes all of the land and
real  property  interest  owned by Seller in the vicinity of the lot or tract of
ground  described on Exhibit "A" to this  Agreement.  If it is  determined  that
Seller owns land or other real property interest adjacent to and in addition to,
that  described on Exhibit "A" to this  Agreement,  then the Deed shall  include
such additional land or interests. The proposed Deed shall be prepared by Seller
at Seller's expense and shall be submitted to Buyer for the Buyer's approval not
less than ten (10) days before the Closing Date.

                  (b) Delivery of Separate Deeds. If the Real Property  consists
of  multiple  parcels at the  Closing,  or if Buyer  desires to create  separate
parcels  or air  rights  estates in and to the Real  Property,  Seller  shall so
convey by the delivery of separate deeds for each parcel,  and in such event the
term "Deed" as used in this Agreement  shall mean all of the deeds  delivered by
Seller to Buyer with respect to the Real Property, collectively.

         7.  Apportionments.

                  (a) (i) Taxes,  Rents, etc. Real estate taxes (on the basis of
the actual fiscal years for which such taxes are assessed) on the Real Property,
personal  property  taxes on the  Personal  Property,  minimum  water  and sewer
rentals, rents including,  without limitation,  expense pass through, percentage
rents  and  other  sums  paid by  tenants,  licensees  and  concessionaires  and
collected by Seller under the Tenant  Leases prior to the Closing,  payments due
under the Service  Agreements (as hereinafter  defined) which are to be assigned
to Buyer  hereunder,  prepaid  liens fees and other  charges  for  licenses  and
permits for the Real  Property  which will remain in effect for Buyer's  benefit
after the  Closing  and  which  are  listed  on  Exhibit  "F" to this  Agreement
including, municipal rubbish removal charges, (if any), shall be apportioned pro
rata between Seller and Buyer on a per diem basis as of the Closing Date.

                           (ii) The  Purchase  Price has not been  increased  by
reason of any  accounts  receivable  held by Seller at Closing.  Therefore,  any
payment  received by Buyer after the Closing Date from a tenant under any of the
Tenant Leases on account of minimum fixed rent which is applicable to periods of
time prior to the Closing  Date and any other  payments  received by Buyer after
the  Closing  Date from a tenant  under any of the  Tenant  Leases on account of
charges to such tenant for utilities or services consumed by or rendered to such
tenant prior to the Closing Date shall be apportioned by Buyer upon receipt, and
the portion thereof attributable to minimum fixed rent or expenses applicable to
periods of time prior to the  Closing  Date shall  promptly  be paid by Buyer to
Seller as an adjustment  to the Purchase  Price and shall be  accompanied  by an
accounting of such payment in reasonable  detail. Any payment received by Seller
after the Closing Date from a tenant  under any of the Tenant  Leases on account
of fixed minimum rent which is  applicable to periods of time  subsequent to the
Closing  Date and any other  payments  received by Seller after the Closing Date
and any other  payments  received by Seller after the Closing Date and any other
payments  received by Seller  after the Closing  Date from a tenant under any of
the Tenant for  utilities  or  services  consumed  by or rendered to such tenant
after the Closing  Date shall be  apportioned  by Seller upon  receipt,  and the
portion  thereof  attributable  to fixed minimum rent or expenses  applicable to
periods of time  subsequent to the Closing Date shall promptly be paid by Seller
to Buyer.  If, at Closing,  any tenants are in arrears in the payment of minimum
fixed rent or utility  charges which were payable prior to the Closing Date, all
payments  by such  tenants  after  Closing  received by Buyer shall be deemed as
being  applicable,  first as against  current amounts then due to Buyer, if any,
and then as against such arrearages.  In the event that any of the tenants under
the Tenant Leases are in monetary  default of their  obligations to Seller under
their respective Tenant Lease as of the Closing Date, and if requested by Seller
to do so Buyer  shall  promptly  and  diligently  endeavor  to collect  any such
amounts after the Closing for the benefit of Seller, and shall remit any amounts
so collected to Seller  promptly  upon receipt  thereof.  Seller  agrees to give
Buyer  ten  (10)  days  prior  written  notice  before  seeking   collection  or
instituting legal  proceedings  against any tenant for the collection of rent or
charges due Seller. This Paragraph 7(a)(ii) shall survive Closing.

                           (iii)  If  the   apportionment  of  any  "escalation"
payment  relating to operating  expenses,  or other payments  received by Seller
prior to the  Closing  Date  from a tenant  under  any of the  Tenant  Leases on
account of  periods  prior to the  Closing  Date or on account of sums which are
attributable  to expenses  incurred by the landlord for periods of time prior to
the Closing  Date,  cannot be precisely  determined  at the Closing,  Seller and
Buyer shall reasonably  estimate the apportionment of such sums pro rata between
Buyer and  Seller on a per diem basis as of the  Closing  Date.  A  post-closing
adjustment  shall be made,  if  necessary,  between  Buyer and  Seller  for such
apportioned  items  within  thirty  (30) days  after  the sums can be  precisely
determined. This Paragraph 7(a)(iii) shall survive Closing.

                           (iv) If  bills  for  real  estate  taxes  on the Real
Property have not been issued as of the Closing Date,  and if the amount of real
estate  taxes  of the then  current  tax  fiscal  year is not  then  known,  the
apportionment  of real estate taxes shall be made at the Closing on the basis of
the prior year's real estate taxes.

                           (v) If, at the Closing, the Real Property or any part
thereof is affected by an assessment  which is payable in  installments of which
the  first  installment  is then a charge  or lien,  or has been  paid  prior to
February 2, 1996, then all unpaid  installments of such  assessments,  including
those which are to become due and payable after the Closing,  shall be deemed to
be due and payable and to be a lien upon the Real Property and shall be paid and
discharged by Seller at the Closing.

                           (vi)  Any  credit  due  to  Buyer  pursuant  to  this
Paragraph 7(a) shall be applied as a credit against that portion of the Purchase
Price  payable at the  Closing;  and any credit due to Seller  pursuant  to this
Paragraph 7(a) shall be paid by Buyer to Seller at the Closing as an addition to
the Purchase Price.

                  (b) Security  Deposits.  The total sum of all tenant  security
deposits listed on Exhibit "G", as updated at the Closing  pursuant to Paragraph
15(a)(xi),  together with all interest earned thereon, if any, as of the Closing
Date which Seller is obligated to pay to tenants, shall be given to Buyer at the
Closing as a credit  against that portion of the Purchase  Price  payable at the
Closing.

                  (c) Utility Meter  Readings.  Seller shall obtain  readings of
the water,  electric,  gas and other utility meters  servicing the Real Property
(other than meters measuring exclusively utility consumption which is to be paid
in full by tenants  under  Tenant  Leases) to a date no sooner  than the Closing
Date. If Seller is unable to obtain  readings of any meters prior to the Closing
Date,  the Closing shall be completed  without such readings and, upon obtaining
said readings,  Seller shall pay the charges  incurred prior to the Closing Date
as reasonably determined by Buyer based upon such readingsy

                  (d) Transfer and Sales Taxes.  Seller and Buyer shall each pay
at  the  Closing  one-half  (1/2)  of  all  realty  transfer,   recordation  and
documentary fees,  stamps and taxes imposed on the Deed,  conveyance of the Real
Property or the transactions contemplated by this Agreement.

                  (e) Adjustments to Purchase Price for Certain Expenditures. At
Closing,  Buyer shall  reimburse  Seller for  commissions  paid by Seller to any
party (a "Lease Broker") and costs for tenant improvements with respect to or on
account of any new Leases  entered into by Seller on or before  February 2, 1996
or  renewals  or  extensions  of Tenant  Leases,  the  terms of which  Buyer has
approved pursuant to the provisions of Paragraph 10 hereof.

         8. Representations and Warranties of Seller. Seller, to induce Buyer to
enter into this  Agreement  and to complete  the  Closing,  makes the  following
representations  and warranties to Buyer, which  representations  and warranties
are true and  correct  as of the date of this  Agreement,  and shall be true and
correct  at  and  as of  the  Closing  Date  in  all  respects  as  though  such
representations  and  warranties  were  made  both at and as of the date of this
Agreement, and at and as of the Closing Date.

                            AS TO THE TENANT LEASES:

                  (a) Exhibit "G" to this  Agreement  is a complete  and correct
list of all of the leases, tenancies,  licenses and other agreements for the use
or  occupancy  of any  portion  of the  Property  in  effect on the date of this
Agreement (the "Tenant Leases")

                  (b) Each of the Tenant Leases is valid and  subsisting  and in
full force and effect and,  except as  otherwise  set forth on Exhibit  "G", the
tenant thereunder is in actual possession of that portion of the Property Leased
pursuant to such Tenant Lease and occupied in accordance  with a properly issued
certificate  of occupancy  and,  except as  otherwise  set forth on Exhibit "G",
neither the tenant nor the landlord is in default under the Tenant Lease.

                  (c) The copies of the Tenant  Leases  previously  delivered by
Seller to Buyer are true and  complete  copies of such Tenant Lease and the same
have  not  been  further  amended,  modified  or  supplemented;  and  no  tenant
thereunder has any right to extend or renew the term thereof except as expressly
set forth in its Tenant Lease.

                  (d) Except as set forth on Exhibit "G", no tenant has asserted
any claim of which Seller has notice which could  adversely  affect the right of
the landlord to collect rent from such tenant and no notice of default or breach
on the part of the landlord  under any of the Tenant Leases has been received by
Seller from any tenant which has not been cured.

                  (e) To the best of Seller's knowledge, All painting,  repairs,
alterations,  improvements  and  other  work  required  to be  performed  by the
landlord  under  the  terms of each of the  Tenant  Leases  and all of the other
obligations  of the  landlord  required to be performed  thereunder  through and
including  February  2, 1996 have been fully  performed  and paid for in full by
Seller.

                  (f) The rents and other  payments set forth on Exhibit "G" are
the actual rents,  income and charges  presently being collected by Seller under
the Tenant Leases, all minimum rent is payable monthly in advance.

                  (g) Except as set forth on Exhibit "G", no tenant under any of
the Tenant Leases is entitled to any concession, allowance, rebate or refund.

                  (h) No tenant  under any of the Tenant  Leases has prepaid any
rent or other charges for more than the current month.

                  (i) To the  extent  any of the  Tenant  Leases  and any of the
rents or other  amounts  payable  under the  Tenant  Leases  has been  assigned,
pledged or encumbered as collateral security, such assignment will be terminated
at the Closing,  whereupon  the Tenant Leases may be assigned by Seller free and
clear of all liens, claims and encumbrances.

                  (j) No security  deposits  have been paid by tenants under the
Tenant Leases which have not previously been returned to the tenants,  except as
listed on Exhibit "G".

                  (k) No brokerage or leasing  commissions or other compensation
is or will be due or payable to any Lease  Broker with  respect to or on account
of any of the Tenant Leases or any extensions or renewals thereof which occurred
on or before February 2, 1996, except as expressly set forth on Exhibit "G"; and
Seller will pay in full, at or before the Closing, all sums now or hereafter due
to any Lease Broker on account of any of the Tenant Leases or any  extensions or
renewals  thereof  or any other  actions  by the  tenants  thereunder  and shall
deliver to Buyer at the Closing written  releases in form  satisfactory to Buyer
of all claims and other  rights by all such Lease  Brokers.  Buyer agrees to pay
all commissions for renewals due and payable on or after February 2, 1996.

                  (1) No tenant under any of the Tenant  Leases has any right or
option to acquire  the  Property  or any  portion  thereof,  except as listed on
Exhibit  "G",  and  there are no  outstanding  agreements  with any other  party
granting  any right or creating  any  obligation  to acquire the Property or any
portion thereof or any interest therein.

                  (m) Except as set forth in Tenant Leases  approved by Buyer in
accordance  with  Paragraph 10 hereof,  Seller has no  obligation to pay rent or
satisfy any other  obligation  of any tenant under any Tenant Lease for space in
any other building,  or to purchase any tenant's  leasehold  estate in any other
building  or to  contribute  to  any  tenant  for  unfinished  tenant  leasehold
improvements  other than those  listed on Exhibit  "G";  and, to the extent such
obligations may exist, Seller will discharge and pay in full, at or prior to the
Closing,  all such  obligations  and  deliver to Buyer at the  Closing a written
release in form  satisfactory  to Buyer of all  claims  and other  rights by the
party to whom Seller is so obligated in connection with such obligations.

                               AS TO THE PROPERTY:

                  (n) Seller  has not  received  any notice (a "Defect  Notice")
from  the  holder  of any  mortgage  presently  encumbering  the  Property  (the
"Existing  Mortgage"),  any  insurance  company  which has issued a policy  with
respect to the  Property or from any board of fire  underwriters  (or other body
exercising  similar  functions)  claiming  any  defects or  deficiencies  in the
Property or suggesting or requesting the performance of any repairs, alterations
or other work to the Property, or any portion thereof.

                  (o)  There  are no  management,  service,  equipment,  supply,
security, maintenance, construction, concession or other agreements with respect
to or affecting the Property, or any portion thereof,  except for the agreements
listed  on  Exhibit  "H"  to  this   Agreement   (collectively,   the   "Service
Agreements");  neither  Seller  nor  the  other  party  to any  of  the  Service
Agreements is in default  thereunder and no event or omission has occurred which
with the giving of notice or lapse of time, or both,  would constitute a default
or breach under any of the Service  Agreements;  each of the Service  Agreements
designated  on Exhibit "H" to be assigned to Buyer at the Closing is  assignable
by Seller and will not be invalidated,  violated or otherwise adversely affected
by the  assignment  thereof or by the  transfer of the  Property  to Buyer;  the
copies of the Service  Agreements  previously  delivered  by Seller to Buyer are
true and  complete  copies  of the  Service  Agreements  and same  have not been
further amended,  modified or supplemented;  and each of the Service  Agreements
designated on Exhibit "H" to be  terminated  shall be terminated by Seller at or
prior to the Closing and all sums due thereunder paid in full by Seller.

                  (p) To the  best of  Seller's  knowledge,  all  buildings  and
improvements (including all roads, parking areas, curbs,  sidewalks,  sewers and
other utilities)  included within the Property have been completed and installed
in  accordance  with the  plans  and  specifications  therefor  approved  by the
governmental authorities having jurisdiction of the Property;

                  (q)  To  the  best  of  Seller's   knowledge,   all  permanent
certificates  of  occupancy  and all other  licenses,  permits,  authorizations,
consents,  certificates and approvals  required by all governmental  authorities
having jurisdiction of the Property and the requisite  certificates of the local
board of fire  underwriters  (or other body exercising  similar  functions) have
been  issued  for the  Property  (and  all  individual  items  constituting  the
Property),  have been paid for, are in full force and effect,  are assignable by
Seller, and will not be invalidated, violated or otherwise adversely affected by
the assignment thereof or by the transfer of the Property to Buyer.

                  (r) The current  zoning  classification  of the Real  Property
under the  applicable  zoning code is "SU-3,  Office  District",  and Seller has
received no notice of any  violations  of any zoning,  subdivision,  building or
similar law, ordinance, order, regulation or recorded plat or any certificate of
occupancy issued for the Property.

                  (s)  Seller  has  received  no  notice  of  any  violation  (a
"Violation") of any applicable law,  ordnance,  code,  rule,  order,  regulation
requirements  of any  governmental  authority  (except for compliance with , the
Americans With Disabilities  Act, Pub. L. 101-336,  July 26, 1990, 104 Stat. 327
and Pub. L. 102-166,  Title I, Section lO9 (a), (b)(2),  Title III, Section 315,
November 21, 1991, 105 Stat. 1077, 1095 (the "ADA" which  non-compliance  Seller
has  disclosed  to  Buyer),   the  requirements  of  any  local  board  of  fire
underwriters (or other body exercising similar functions),  or the provisions of
the Tenant Leases or Service Agreements; and there are not presently outstanding
and uncured notices of any Violations.

                  (t) Exhibit "I" to this Agreement sets forth the only fire and
extended coverage  insurance  policies  maintained by Seller with respect to the
Property ("Policy"); the Policy is in full force and effect and all premiums due
thereunder  have been  paid;  and Seller has not  received  any notice  from the
insurance companies which issued the Policy, indicating that the Policy will not
be  renewed or will be renewed at a higher  premium  than is  presently  payable
therefor.

                  (u) There is no action,  suit or proceeding pending or, to the
knowledge of Seller,  threatened  against or affecting Seller or the Property or
any  portion  thereof  or any of the  Tenant  Leases or  Service  Agreements  or
relating to or arising out of the  ownership,  management  or  operation  of the
Property in any court or before or by any  federal,  state,  county or municipal
department,   commission,   board,   bureau  or  agency  or  other  governmental
instrumentality.

                  (v) All taxes  currently  due and payable  with respect to the
Real Property have been paid; the Real Property constitutes separate tax parcels
and are separately assessed for real estate tax purposes; there is no proceeding
pending for the  adjustment  of the assessed  valuation of all or any portion of
the Real  Property;  the Real  Property has been  assessed and real estate taxes
have been paid on the basis of the value of all improvements as completed; there
is no  abatement in effect with respect to all or any portion of the real estate
taxes,  the real estate tax bills  previously  delivered  by Seller to Buyer are
true and complete  copies of all bills for taxes levied against or on account of
the Property of any rent or income from the Property since January 1, 1993.

                  (w) To the best of Seller's knowledge,  no portion of the Real
Property is located within an area  designated as a flood hazard area or an area
which will  require the  purchase of flood  insurance  for the  obtaining of any
federally  insured or federally related loan; no portion of the Real Property is
located  in any area  constituting  a  "wetland"  or "other  water of the United
States"  or "waters of the  United  States"  or "waters of the  Commonwealth  of
Pennsylvania" (as defined in Paragraph ll(a)(v) hereof),  or in a "coastal zone"
as  defined  under  federal,  state or local  law;  and no  portion  of the Real
Property is located in any conservation or historic district.

                  (x) Seller  has not  received  any notice of any  condemnation
proceeding or other  proceedings  in the nature of eminent  domain in connection
with the Property (a "Taking"),  and, to Seller's knowledge,  no Taking has been
threatened.

                  (y) All  contractors,  subcontractors  and  other  persons  or
entities  furnishing work, labor,  materials or supplies for the development and
construction  of the  Property  have  been  paid in full and there are no claims
against the Seller or the Property in connection therewith.

                  (z) All of the  books,  records,  information,  data and other
items  supplied by Seller to Buyer,  and upon which  Seller  prepared  financial
statements  for the past three (3) years for the operation of the Property,  are
all true,  complete and correct in all material respects,  have been prepared in
accordance with generally  accepted  accounting  practices and  principles,  and
fairly and accurately  present the results of operations of the Property for the
past three (3) years.

                  (aa) The  statement of income and expense  attached as Exhibit
"J" to this  Agreement  is true,  complete and  correct,  fairly and  accurately
reflects  the income and  expenses  of the  operation  of the  Property  for the
periods  reflected  thereby,  and  has  been  audited  and  certified  to  by an
independent  certified  public  accountant  or was prepared in  accordance  with
generally accepted accounting practices and principles.

                  (bb) To the best of  Seller's  knowledge,  the  copies  of the
documents constituting the easements, rights-of-way, restrictions and agreements
of record  specified on Exhibit "D" to this  Agreement  previously  exhibited by
Seller  to Buyer  (the  "Recorded  Agreements")  are true  and  complete  copies
thereof, and same have not been further amended,  modified or supplemented;  and
no default  or breach  exists  under the  Recorded  Agreements,  and no event or
omission has occurred which, with the giving of notice or lapse of time or both,
would constitute a default or breach under the Recorded Agreements.

                  (cc) No portion  of the Real  Property  is the  subject of any
abatement,  reduction,  deferral or "rollback"  with regard to real estate taxes
nor any agreement or arrangement whereby the Real Property may be subject to the
imposition of real  property  taxes after the Closing Date on account of periods
of time prior to the Closing Date;  the Real Property has not, prior to the date
of this  Agreement,  and will not,  prior to the Closing  Date,  be subject to a
covenant with the County of Delaware or any other  governmental  agency pursuant
to the Act of January 13, 1965 P.L. 1292, as amended,  16 P.S.  Section 11941 et
seq. ("Act 515") or the Pennsylvania  Farmland and Forest Land Assessment Act of
1974, as amended,  72, P.S.  Section 5490.1 et seq. ("Act 319"),  or any similar
law; and in the event of a breach by Seller of the  representation  and warranty
set forth in this  Paragraph  8(ee),  then,  in addition to all other rights and
remedies  provided to Buyer at law or  pursuant to the terms of this  Agreement,
and  notwithstanding  any other  provision set forth in this  Agreement,  Seller
shall be solely responsible for any and all accrued taxes,  interest and penalty
imposed upon the Real Property from the  commencement  of any covenant under Act
515 or Act 319 or other agreement or arrangement up to and including the Closing
Date, which taxes, interest and penalties shall be satisfied at the Closing.

                  (dd) To the  best  of  Seller's  knowledge,  all  fire  safety
systems at or serving the Property are  identified as "K" to this  Agreement and
are in good condition, repair and working order.

                  (ee) The  execution  and  delivery of this  Agreement  and the
performance by Seller of its obligations  hereunder have been duly authorized by
all requisite corporate action, and will not conflict with or result in a breach
of  any  of  the  terms,   conditions  or  provisions  of  the   Certificate  of
Incorporation  or Bylaws of Seller,  and will not  conflict  with or result in a
breach of any law,  regulation or order, or any agreement or instrument to which
Seller is a party or by which  Seller is bound or the  Property is subject;  and
this  Agreement  and the  documents to be  delivered by Seller  pursuant to this
Agreement  will each  constitute  the legal,  valid and binding  obligations  of
Seller,  enforceable in accordance with their  respective  terms,  covenants and
conditions; and there are no claims, defenses (personal or otherwise) or offsets
to the validity of or  enforceability  against  Seller of this Agreement and the
documents to be delivered pursuant hereto.

         9.  Survival of Representations, Warranties and Obligations.

                  (a)   Surviving    Representations    and   Warranties.    The
representations  and  warranties  of  Seller  set forth in  Paragraph  8 of this
Agreement  shall  remain in effect  for a period of one (1) year  following  the
Closing  Date and  thereafter  if Buyer  shall have given to Seller  notice of a
breach   thereof   within  one  (1)  year  period.   For  the  purposes  of  the
representations  and  warranties  contained in this  Agreement,  the receipt by,
notice to or knowledge of Seller's managing agent at the Property, if any, shall
be attributed to Seller.

         10.  Operations Prior to Closing.  Between the date of the execution of
this Agreement and Closing:

                  (a) Repairs;  Alterations.  Seller shall, at its expense, make
all repairs and replacements,  structural and nonstructural,  which are required
with  respect to any  portion of the  Property  to  maintain  it in its  present
condition,  which in all instances  shall be in accordance  with all  applicable
federal,  state and local laws, and in accordance with sound business practices,
except  only  damage by a  Casualty  (which  term is  defined  in,  and shall be
governed by, the provisions of Paragraph 12 below) and reasonable wear and tear.
Seller will not in any manner alter the  condition of the  Property,  including,
without limitation,  the removal therefrom of soil or other ground conditions or
the making of any  changes or  alterations  to the  buildings  and  improvements
thereon.

                  (b) Operations and Management. Seller shall operate and manage
the Property in the same manner as it has been operated and managed prior to the
date of this  Agreement  and in accordance  with  applicable  law.  Seller shall
submit to Buyer monthly reports of rental collections, occupancy and vacancies.

                  (c) Compliance with Obligations.  Seller shall comply with all
of the obligations of Seller under the Tenant Leases, the Service Agreements and
all other  agreements and  contractual  arrangements  by which Seller and/or the
Property are bound or affected.  Seller shall  maintain the Policy in full force
and effect and shall pay all  required  premiums  and other  charges.  If Seller
fails to make any  payments  required  under the  provisions  of this  Paragraph
10(c),  Buyer may,  at or prior to the Closing  Date,  in addition to all of its
other rights and remedies  available at law, in equity or under this  Agreement,
make such  payment on behalf of Seller and set off and deduct the amount of such
payment against the Purchase Price.

                  (d)  New Contracts; New Leases.

                           (i) Seller  shall not enter into any  contract for or
on behalf of or affecting the  Property,  unless such contract can be terminated
upon at least thirty (30) days prior notice or without charge,  cost, penalty or
premium,  and shall not renew,  fail to give a notice  which,  in the absence of
which, will result in an automatic  renewal of, modify,  cancel or terminate any
Service  Agreement,  and shall not renew,  fail to give a notice  which,  in the
absence of which, will result in an automatic renewal of, modify, cancel, accept
surrender of,  terminate,  or accept any advance  rental under any of the Tenant
Leases.  Seller shall not execute any new service agreement or new lease for any
portion of the Property without the prior written consent of Buyer which consent
shall not be unreasonably withheld or delayed.

                           (ii) (A)  Notwithstanding the provisions of Paragraph
10(d)(i)  above,  Seller may enter into new leases prior to the Closing Date for
portions of the Real Property which are or may become vacant or may renew any of
the Tenant Leases which expire prior to the Closing  Date,  subject to the prior
approval of Buyer to the terms thereof, which approval shall not be unreasonably
withheld or delayed.

                                    (B) Seller shall use  reasonable  efforts to
obtain tenant leases with respect to any portion of the Real Property  which are
or may become vacant prior to the Closing Date, and to obtain renewals of any of
the Tenant Leases which expire prior to the Closing Date.

                                    (C) All unrented spare units in the Property
which have been  vacated by tenants and not  reoccupied  prior to the Closing or
which have never been  occupied  shall be  delivered  at the Closing free of all
personal property not conveyed to Buyer under this Agreement.

                                    (D)  Seller  will  not  apply  any  security
deposit paid under any of the Tenant Leases to the payment of rent or on account
of any default by the tenant  unless shown on rent roll and  occurring  prior to
February 2, 1996

                  (e)  Buyer's Access.

                           (i) Buyer,  its attorneys,  accountants,  architects,
engineers and other representatives shall be afforded access to the Property and
to all books,  records and files relating to the operation  thereof,  including,
without  limitation,  any and all studies  and/or  reports  conducted  by or for
Seller with respect to the condition of any and all mechanical  systems  located
on or within the Property (including those relating to the heating,  ventilation
and air conditioning  system(s)),from  time to time prior to the Closing for the
purposes of inspections, preparation of plans, taking of measurements, making of
surveys,  making  of  appraisals  and  generally  for the  ascertainment  of the
condition  of  the  Property;   and  there  shall  be  furnished  to  Buyer  all
documentation  concerning  the  Property  in the  possession  of  Seller  and/or
Seller's   management  agent  for  the  Property  which  Buyer,  its  attorneys,
accountants,  architects,  engineers and other  representatives shall reasonably
request.  All of the foregoing  information and materials shall be maintained in
the  strictest  of  confidence  by Buyer  and  Buyer's  attorneys,  accountants,
architects,  engineers and other  representatives and shall be promptly returned
to Seller  upon any  terimation  of this  Agreement.  Buyer  shall  cause all of
Buyer's  representatives  as  aforesaid  to  comply  with  all of the  foregoing
requirements.

                           (ii) Any entry upon the Real Property by Buyer or its
representatives  shall be at their sole risk and shall occur at reasonable times
and in a manner which does not unreasonably interfere with the use and occupancy
of the Real  Property by any of the  tenants.  In the event that Buyer or any of
its representatives conduct any tests upon any Real Property, upon completion of
such  tests  Buyer  shall   promptly  and  fully   restore  the  Real   Property
substantially  to the condition  which it was in prior to  commencement  of such
tests.  The  results of all tests  shall be  supplied  to Seller  promptly  upon
Buyer's receipt thereof.


                           Any entry on the  Property  by Buyer or its agents or
representatives  pursuant to which Paragraph 10 shall be subject to Buyer's full
compliance with the following terms and conditions:

                                    (A) Buyer  agrees to  indemnify,  defend and
hold  harmless  Seller  from and against  any and all  claims,  suits,  actions,
liabilities,  losses,  damages  and  expenses  (including,  without  limitation,
reasonable attorneys' fees) of every kind and nature arising in whole or in part
from  any  act or  omission  of  Buyer  or any  of  its  employees,  architects,
engineers, contactors,  subcontractors, agents or invitees while in, on or about
the  Property.  This  Paragraph  10(e)(ii)(A)  shall  survive the Closing or any
sooner termination of this Agreement for a period equal to any applicable period
for the limitation of actions under applicable law following the Closing or such
sooner termination, and thereafter if Seller shall have given notice to Buyer of
a claim hereunder within such period until such claim is finally resolved.

                  (f) Notices.  Promptly after receipt thereof by Seller, Seller
shall deliver to Buyer the following:

                           (i) a copy of any notice of default given or received
under any of the Tenant Leases or the Service Agreements;

                           (ii) a copy of any  additional  Tenant Lease executed
by Seller as  permitted  by the terms of Paragraph  10(d)(ii)  hereof,  as fully
executed;

                           (iii) a copy of any tax bill,  notice or statement of
value,  or  notice of change in a tax rate  affecting  or  relating  to the Real
Property;

                           (iv) a copy of any  notice of an  actual  or  alleged
Violation; and

                           (v) a copy of any notice of a Taking.

                  (g)  Employees.  At the Closing,  Seller shall  terminate  the
employment of all persons and/or  entities then employed by Seller in connection
with the  management,  operation and  maintenance  of the Property,  if any, and
Seller shall pay all accrued and unpaid vacation,  salary,  wages,  benefits and
other  compensation  owed to same as of the Closing  Date or required to be paid
under  applicable  law. Buyer shall assume no liability for any such payments or
for any other such obligations of Seller, and Seller shall indemnify, defend and
hold  Buyer  harmless  from and  against  all  claims  in  connection  with such
vacation,  salary, wages, benefits and other compensation which have accrued and
are payable as of the Closing Date.

                  (h) Tenant  Estoppel  Certificates.  Seller shall complete and
deliver  for  execution  by each  tenant  under  the  Tenant  Leases  which  are
designated on Exhibit "G" as requiring a Tenant  Estoppel  Certificate a written
certification  in the form of Exhibit "L" to this  Agreement  ("Tenant  Estoppel
Certificate"),  and shall use its best  efforts  to  obtain an  executed  Tenant
Estoppel  Certificate from each tenant.  Seller shall deliver to Buyer a copy of
each executed  Tenant  Estoppel  Certificate  delivered to Seller promptly after
receiving same.

         11.  Environmental Matters.

                  (a)  Representations  and  Warranties.  Seller  represents and
warrants to Buyer that, to the best of Seller's knowledge,:

                           (i) The Property and all activities and conditions at
the  Property  including,  without  limitation,  those  involving  the  use  and
operation of the Personal  Property,  are in compliance  with the  Comprehensive
Environmental Response,  Compensation and Liability Act, 42 U.S.C. Sections 9601
et seq.  ("CERCLA"),  as amended by the Superfund Amendments and Reauthorization
Act of 1986  ("SARA"),  the Resource  Conservation  and Recovery  Act, 42 U.S.C.
Sections  6901 et seq.,  as amended  from time to time  ("RCRA"),  and the Clean
Water Act, 33 U.S.C.  Sections 1251 et seq.,  as amended from time to time,  the
Clean Air Act, 42 U.S.C. Sections 7401 et seq, as amended from time to time, the
Toxic Substances  Control Act, 15 U.S.C.  Sections 2601 et seq., as amended from
time to time, the Hazardous Materials Transportation Act, 49 U.S.C. Section 6901
et seq., as amended from time to time, the Federal Water Pollution  Control Act,
33 U.S.C. Sections 1251 et seq., as amended from time to time, the Safe Drinking
Water Act,  42 U.S.C.  Sections  300f-300j,  as amended  from time to time,  the
Pennsylvania  Hazardous Sites Cleanup Act, 35 P.S. Sections 6020.101 et seq., as
amended from time to time ("HSCA"), and the Dam Safety and Encroachments Act, 32
P.S.  Sections  693.1 et seq., as amended from time to time,  and with all other
federal, state and local environmental laws, statutes, ordinances,  regulations,
rules,  orders and  requirements  of common law including,  without  limitation,
those  relating to the  construction,  operation,  maintenance  or repair of any
improvements or equipment or other Personal Property; the discharge, emission or
release of any Contaminant (as  hereinafter  defined) to the air, soil,  surface
water or ground water; the discharge of any dredge or fill material to a wetland
or other  water of the United  States (as  hereinafter  defined);  the  storage,
treatment,  disposal  or  handling  of any  Contaminant;  or  the  construction,
operation,  maintenance or repair of  aboveground  or underground  storage tanks
(collectively, "Environmental Laws").

                           (ii) No  Contaminant  is present on, over or under or
is migrating from the Property or is present on any of the Personal  Property or
on,  over or  under  any  premises  adjacent  to the  Property.  As used in this
Agreement,  the term  "Contaminant"  shall  mean any  "hazardous  substance"  or
"pollutant or contaminant" as defined pursuant to CERCLA or HSCA, "petroleum" as
defined   pursuant  to  RCRA,  or  any  material   containing   petroleum,   any
polychlorinated  biphenyls  ("PCBs") or  substances  containing  PCBs,  any urea
formaldehyde foam, or any asbestos or materials containing asbestos.

                           (iii)  Neither radon nor any radon progeny is present
at any area of the Property in excess of 4 picocuries/liter.

                           (iv) Seller has not, and except as disclosed to Buyer
in that certain Limited Subsurface Investigation Report by Enviro Business, Inc.
dated January 3, 1996 and that certain  Environmental  Site  Assessment and Soil
Removal Report of Harpstead Enviromental, Inc. dated August 17, 1992, nor to the
best of its knowledge has anyone else, generated,  stored, treated, disposed of,
discharged,  released,  emitted or otherwise  handled any  Contaminant on, over,
under,  from or in any manner affecting the Property or any premises adjacent to
the Property or in connection  with the Personal  Property.  For the purposes of
this  subparagraph  (iv)  only,  "Contaminant"  shall not  include  construction
materials (other than asbestos,  polychlorinated  biphenyls or urea formaldehyde
foam),  office equipment,  fuel and other similar products contained in vehicles
and cleaning solutions and other maintenance materials that are customarily used
or stored  incidental  to and are  reasonably  necessary  for the  operation  or
maintenance of the Property.

                           (v) Seller has not, nor to the best of its  knowledge
has anyone  else,  discharged  any dredge or fill  material to any  "wetland" or
"waters of the United States" or "waters of the Commonwealth of Pennsylvania" on
the  Property,  as  those  terms  are  defined  in  the  rules  and  regulations
promulgated  pursuant to the Clean Water Act or the Dam Safety and Encroachments
Act or other applicable federal, state or local law.

                           (vi)  Neither  the  Property  nor,  to  the  best  of
Seller's knowledge,  any adjacent premises, is listed or proposed for listing on
the  National  Priorities  List  established  pursuant to Section  105(8)(B)  of
CERCLA,  42  U.S.C.  Section  9605(8)(B),  or on any other  hazardous  site test
promulgated by any federal, state or local government or governmental agency.

                           (vii) No underground or aboveground storage tanks are
present at the Property.

                           (viii) Seller has provided  Buyer with copies of all:
(A)  permits,  licenses,   certificates,   registrations,   approvals,  and  any
amendments  thereto  required  for the  Property and for the conduct of Seller's
activities  at  the  Property  pursuant  to or  necessary  for  compliance  with
Environmental  Laws; (B) applications,  reports or other materials  submitted to
any governmental agency in connection with any Environmental Law; (C) records or
manifests required to be maintained  pursuant to Environmental Laws or which are
relevant to the issue of compliance with Environmental Laws; (D) correspondence,
notices of  violation,  summonses,  orders,  administrative,  civil or  criminal
complaints,  requests for information or other  documents  received by Seller or
its agents pertaining to compliance with  Environmental  Laws or the generation,
storage, treatment,  handling, discharge,  emission, release or migration of any
Contaminant on, over, under, from or affecting the Property; and (E) records and
analyses  of any  environmental  tests  pertaining  to the  Property  including,
without  limitation,  the  results of any air,  water or soil  analyses  or tank
integrity  testing which are in the  possession of Seller or any managing  agent
for the Property or the existence of which is known to Seller.

                           (ix) No civil, criminal or administrative  proceeding
is pending or threatened  relating to  Environmental  Laws or  Contaminants  on,
over,  under,  from or affecting  the  Property;  neither  Seller nor any of its
agents has received any notice of violation or potential liability regarding the
Property or activities  thereon relating to  Environmental  Laws or Contaminants
on, over,  under from or affecting the Property and Seller has no reason to know
of  circumstances  that would give rise to such  notices or  proceedings  in the
future;  Seller  has  not  entered  into  any  consent  order,  consent  decree,
administrative  order,  judicial order or settlement  relating to  Environmental
Laws or Contaminants on, over, under, migrating from or affecting the Property.

                  (b) Cooperation.  Seller will assist Buyer in giving notice to
applicable  government  agencies and in  transferring  or reissuing to Buyer any
permit,  license,  certificate,  registration  or other  approval  necessary  to
continue  operations at the Property,  or in obtaining for Buyer any new permit,
license,  certificate,  registration  or  approval  required  of Buyer under any
Environmental Law.

                  (c) Liens.  Seller  represents  and warrants  that it does not
know or have reason to know of any lien imposed, or any circumstance which might
lead to  imposition  of a lien,  upon its revenues or personal or real  property
pursuant to any Environmental Law.

                  (d)  Buyer's Environmental Investigation.

                           (i) Upon execution of this Agreement by Seller, Buyer
may contract for the preparation of a Phase I environmental  report with respect
to the  Property  (the  "Phase  I"), at Buyer's  sole cost and  expense,  with a
consultant  selected by Buyer,  which shall include an  investigation  of, inter
alia, compliance with Environmental Laws, the presence of Contaminants on, over,
under,  migrating from or affecting the Property including,  without limitation,
in  connection  with the use and  operation  of any personal  property,  and the
presence of conditions that may affect Buyer's intended use of the Property.

                           (ii) Seller will give reasonable cooperation to Buyer
and  Buyer's  agents  in the  preparation  of the  Phase  I  including,  without
limitation,  (A)  complying  with  requests for  information  and  records;  (B)
assisting  Buyer in obtaining  governmental  agency or other  records and,  upon
Buyer's request,  communicating directly with any governmental agencies; and (C)
granting  Buyer access to the entire  Property  including,  without  limitation,
access for  collecting  surface or  subsurface  samples of soil,  vegetation  or
water, or samples from buildings and other  improvements  and Personal  Property
located  on the  Property,  including  samples  from  walls,  floors,  ceilings,
plenums, paved areas and other areas the taking of which samples may necessitate
some damage to the buildings,  other improvements or the Personal Property,  and
installing  groundwater  monitoring wells if necessary in Buyer's opinion.

                           (iii)   If,  in   Buyer's   sole   opinion,   Buyer's
environmental  investigation is not completed by at least ten (10) business days
prior to the Closing Date, then at Buyer's election Closing shall  automatically
be extended to the tenth (10th)  business day  following  completion  of Buyer's
investigation,  but in no event shall the  Closing be extended  pursuant to this
subparagraph beyond thirty (30) days after the Closing Date established pursuant
to Paragraph 4(b) hereof.

                           (iv) If, in Buyer's sole opinion,  the  environmental
investigation  indicates  any  non-compliance  with  Environmental  Law at or in
connection  with the Property or the  Personal  Property or the use or operation
thereof,  or the presence of  Contaminants  on, under,  over,  migrating from or
affecting the Property or the presence of any condition  that may affect Buyer's
intended use of the  Property,  then, at Buyer's  election,  Buyer may terminate
this Agreement together with reimbursement to Buyer of Reimburseable Costs in an
amount not to exceed Fifty Thousand Dollars ($50,000.00).

                           (v) Buyer's  environmental  investigation shall in no
way limit or otherwise affect Seller's representations and warranties under this
Paragraph 11 hereof in any other provision of this Agreement.

                  (e) Indemnification. Provided Seller is notified of such claim
within one (1) year after the Closing Date,  Seller  agrees to  indemnify,  hold
harmless,  defend and reimburse  Buyer for, and release  Buyer from,  all costs,
expenses (including, without limitation,  reasonable attorneys' fees, consultant
and expert fees and court costs), losses (including, without limitation, loss of
income and loss of value of the Property),  and liabilities (including,  without
limitation,  common law and  statutory  liability)  suffered by Buyer from or in
connection  with  any  of  the  following:  (i)  Seller's  breach  of any of the
provisions in this Paragraph 11; (ii) compliance with any present  Environmental
Laws incurred on account of the status of or conditions existing at the Property
before the  Closing;  (iii)  studying or  remedying  contamination  or suspected
contamination of the Property by any Contaminant,  which  contamination  existed
before the Closing; (iv) costs incurred due to any investigation of the Property
or any cleanup,  removal,  remediation or any restoration required by a federal,
state or local governmental agency or political subdivision or court arising out
of the condition of the Property before Closing;  and (v) claims,  sums paid for
settlement of claims, damages,  fines,  penalties,  judgments or other sanctions
incurred, arising out of, relating to or on account of any Environmental Laws or
the presence of any Contaminants  (including,  without limitation,  any personal
injury or property damage relating  thereto) arising out of the condition of the
Property before the Closing, except as may have been disclosed to Buyer prior to
the Closing Date.

                  (f) Choice of Remedies.  None of the remedies described herein
shall exclude or limit Buyer's  common law rights of recovery,  contribution  or
other legal redress, or Buyer's right to obtain statutory relief including,  but
not limited to, a cost recovery  action under CERCLA or other federal,  state or
local  statutes  providing  for  similar  remedies  and the  right  to  specific
performance.

                  (g)   Survival.    The    representations,    warranties   and
indemnifications  of this Paragraph 11 shall survive the Closing for a period of
one (1) year after the Closing Date.

         12.  Casualty.

                  (a) Seller's  Insurance.  Seller shall  maintain the Policy in
effect until the time of the  Closing,  and shall  deliver to Buyer,  within ten
(10) days after the date of this Agreement,  an endorsement to the Policy issued
by the insurance  company  issuing the Policy  evidencing  that the Policy is in
effect,  that the same will not be cancelled or materially  modified  without at
least thirty (30) days prior  written  notice to Buyer,  and that Buyer has been
named as an additional insured party thereunder,  as its interest may appear. At
the Closing,  Seller may cancel the Policy and the full short rate rebate of the
prepaid premium shall be paid to Seller.

                  (b) Destruction.  If at any time prior to the Closing Date any
portion of the Property is destroyed or damaged as a result of fire or any other
casualty  ("Casualty"),  Seller shall  promptly give written  notice  ("Casualty
Notice")  thereof to Buyer. If the Property is the subject of a Casualty,  Buyer
shall have the right,  at its sole option,  of  terminating  this  Agreement (by
written  notice to Seller and the Escrow  Agent given within ten (10) days after
receipt of the Casualty Notice from Seller)  unless,  if  insubstantial  and not
material,  the Casualty  damage or  destruction is fully repaired or restored by
Seller prior to the Closing Date. If Buyer does not  terminate  this  Agreement,
the proceeds of any insurance with respect to the Property paid between the date
of this  Agreement  and the Closing  Date and not  retained by the holder of the
Existing  Mortgage,  less an amount to be retained  by Seller  equal to Seller's
deductible under the Policy,  shall be paid to Buyer at the time of the Closing,
and all unpaid claims and rights in connection with losses to the Property shall
be assigned to Buyer at Closing  without in any manner  affecting  the  Purchase
Price.

                  (c) Repairs. If the Property is the subject of a Casualty, but
Buyer does not terminate this Agreement  pursuant to the provisions of Paragraph
12(b) hereof,  then Seller shall cause all  temporary  repairs to be made to the
Property as shall be required to prevent further deterioration and damage to the
Property  prior to the Closing Date;  provided,  however,  that any such repairs
shall first be approved by Buyer.  Seller shall have the right to be  reimbursed
from the proceeds of any insurance with respect to the Property paid between the
date of this  Agreement  and the Closing  Date and not retained by the holder of
the Existing  Mortgage  for the cost of all such  repairs made  pursuant to this
Paragraph 12(c).  Except for the obligation of Seller to repair the Property set
forth in this Paragraph  12(c),  Seller shall have no other obligation to repair
any  Casualty,  damage  or  destruction  in the  event  Buyer  does not elect to
terminate this Agreement  pursuant to the provisions of Paragraph  12(b), and in
such  event,  Buyer  shall  accept  the  Property  at the  Closing as damaged or
destroyed  by the  Casualty  and  Buyer  shall  have the right to enter the Real
Property prior to the Closing for the purpose of performing such repairs thereto
(at Buyer's  sole cost and expense) as are  reasonably  necessary to protect the
Property against further damage prior to the Closing Date.

         13. Eminent Domain. If a Taking affects all or any part of the Property
prior to the Closing,  or if any proceeding  for a Taking is commenced  prior to
the Closing, or if notice of the contemplated  commencement of a Taking is given
prior to the  Closing,  Buyer  shall  have the  right,  at its sole  option,  of
terminating  this  Agreement  (by written  notice to Seller within ten (10) days
after  receipt by Buyer of written  notice from Seller of the Taking).  If Buyer
does not terminate this  Agreement  pursuant to the provisions of this Paragraph
13,  Seller  shall,  at the Closing,  be deemed to have assigned to Buyer all of
Seller's  right,  title and  interest  in and to any  awards or damages to which
Seller may have become  entitled or may  thereafter be entitled by reason of any
exercise of the power of eminent domain or  condemnation  with respect to or for
the Taking of the Property or any portion thereof.

         14.  Conditions of Buyer's Obligations.

                  (a) Conditions.  The obligations of Buyer under this Agreement
are  subject  to the  satisfaction  at the  time of the  Closing  of each of the
following  conditions  (any one of which  may be  waived  in whole or in part in
writing by Buyer at or prior to the Closing):

                           (i)  all of the  representations  and  warranties  by
Seller set forth in this  Agreement  shall be true and  correct at and as of the
Closing Date in all respects as though such  representations and warranties were
made both at and as of the date of this  Agreement  and at and as of the Closing
Date;

                           (ii)  no   representation   or   warranty  by  Seller
contained in this Agreement  shall contain any untrue  statement or shall omit a
material  fact  necessary  to make the  statement  of fact  therein  recited not
misleading;

                           (iii)  Seller  shall have  performed  all  covenants,
agreements and  conditions  required by this Agreement to be performed by Seller
prior to or as of the Closing Date;

                           (iv) there shall have been no material adverse change
in the  financial  condition of the Property  during the period from the date of
this Agreement to the Closing Date;

                           (v) that  portion of the  Property  subject to Tenant
Leases is leased in  accordance  with the Rent Roll  attached  hereto as Exhibit
"G", is fully occupied under properly issued  certificates of occupancy pursuant
to valid and fully enforceable  Tenant Leases and all rent payable thereunder is
paid to date;

                           (vi) executed Tenant Estoppel Certificates shall have
been received within thirty (30) days after the date of this Agreement from each
of the tenants  under the Tenant  Leases which are  designated on Exhibit "G" as
requiring a Tenant Estoppel Certificate;

                           (vii)  Buyer shall have  reviewed  and  approved  the
Tenant Leases and operating  costs of the Property within thirty (30) days after
the date of this Agreement.;

                           (viii) Seller shall have  delivered,  or caused to be
delivered,  all of the documents  required to be delivered at Closing under this
Agreement;

                           (ix)  Buyer  shall  have   received  an  updated  and
recertified as-built survey of the Property certified to Buyer and disclosing no
conditions objectionable to Buyer.

                  (b) Failure of Condition.  In the event any of the  conditions
set forth in Paragraph  14(a) hereof are not  satisfied as of the Closing  Date,
Buyer  shall  have the  right (in  addition  to all other  rights  and  remedies
available  to Buyer under this  Agreement,  at law or equity),  at Buyer's  sole
option (by written notice to Seller) to (i) terminate Buyer's  obligations under
this  Agreement;  or (ii) complete the Closing  notwithstanding  the unsatisfied
condition;  or (iii)  adjourn  the  Closing  to a date not later than sixty (60)
days, during which period Seller shall satisfy any unsatisfied conditions within
Seller's power to satisfy;

                  (c)  Inspection  Contingency.  Buyer shall,  during the period
from the date Buyer  receives from Seller a fully  executed  counterpart of this
Agreement to the date occurring  thirty (30) days  thereafter  (the  "Inspection
Period"),  examine the Property,  the Rent Roll, the Tenant Leases,  the Service
Agreements,  the Policy,  the Permitted  Encumbrances  and the other items to be
delivered  by Seller to Buyer,  cause any survey to be prepared and commence any
environmental  study  including,  without  limitation,  causing test bores to be
drilled. Buyer may, for any or no reason whatsoever, terminate this Agreement by
written  notice given to Seller on or before the  expiration  of the  Inspection
Period (a  "Termination  Notice").  Upon  delivery  of a  Termination  Notice as
aforesaid, Buyer shall be entitled to the return of the Deposit and all interest
accrued thereon;  and upon such payment,  except as otherwise expressly provided
herein,  this Agreement shall be and become null and void,  neither party hereto
shall have any further rights or obligations hereunder and all original executed
counterparts of this Agreement shall be returned to Seller for cancellation.  In
the event Buyer  terminates  this  Agreement in accordance  with this  Paragraph
14(c),  Buyer shall not be entitled to be reimbursed  from Seller for any of the
Reimbursable Costs.

         15.  Items to be Delivered at the Closing.

                  (a) By Seller.  At the Closing,  Seller shall deliver to Buyer
the following:

                           (i)  Deed .  The Deed.

                           (ii)  Bill of Sale.  The Bill of Sale.

                           (iii)  Assignment  of Leases and Service  Agreements.
Assignments  in the form of Exhibits  "L" and "M",  respectively,  of the Tenant
Leases and the Service  Agreements  designated  on Exhibit "H" to be assigned to
Buyer,  duly  executed  and  acknowledged  by  Seller  and in  proper  form  for
recording,  assigning  to Buyer or  Buyer's  assignee  all of the  lessor's  and
Seller's right,  title and interest in and to the Tenant Leases and such Service
Agreements, together with an original executed copy of each of the Tenant Leases
and all guarantees and to the extent in Seller's  possession,  tenant  financial
information,  insurance  certificates,  correspondence and all other information
and files relating thereto,  and each such Service Agreements and a letter, duly
executed  by Seller,  in form  satisfactory  to Buyer  addressed  to each of the
tenants under the Tenant  Leases and other parties under the Service  Agreements
informing each of the assignments.

                           (iv) Certificates,  Etc. An assignment, duly executed
and  acknowledged  by Seller,  of (and  delivery to Buyer of originals or copies
of): all permanent  certificates of occupancy and all other  licenses,  permits,
authorizations,   consents,   certificates   and   approvals   required  by  all
governmental authorities having jurisdiction over the Property; all fees, escrow
and/or  security  funds,   deposits  and  other  sums  heretofore  paid  to  any
governmental  authority in connection with the Property; all certificates issued
by the local  board of fire  underwriters  (or  other  body  exercising  similar
functions); all plans,  specifications and project manuals for the Property; all
guarantees,  bonds and  warranties  with respect to the Property  (together with
original counterparts of such instruments); and all keys to the Property.

                           (v)  Assignment of Escrow  Deposits.  An  assignment,
duly  executed by Seller,  assigning to Buyer or Buyer's  assignee all sums,  if
any, then on deposit with the holder of the Existing Mortgage for the payment of
real estate taxes,  insurance  premiums,  and any other amounts then held by the
holder of the Existing Mortgage.

                           (vi) Assignment of Name. An assignment, duly executed
by Seller,  assigning to Buyer or Buyer's  assignee,  Seller's rights to use all
names or designations pertaining to the Property.

                           (vii)   Tenant   Estoppel   Certificates.    Original
counterparts of the Tenant Estoppel Certificates.

                           (viii) Releases.  The releases from the Lease Brokers
specified in Paragraph 8(k) hereof duly executed and  acknowledged by each Lease
Broker and  addressed to Buyer or Buyer's  assignee,  and the releases  from the
parties  specified in Paragraph  8(m) hereof duly executed and  acknowledged  by
each such party and addressed to Buyer or Buyer's assignee.

                           (ix) Resolutions; Title Company Affidavits, Etc. Such
resolutions  and  certificates  as Buyer or the Title  Company  shall require to
evidence  the  due  authorization  of the  execution  and  performance  of  this
Agreement  and the  documents to be delivered  pursuant  hereto;  if Seller is a
corporation,  Seller's Articles or Certificate of Incorporation and by-laws,  as
amended,  certified  by the  secretary  of Seller;  if Seller is a  partnership,
Seller's partnership  agreement,  as amended,  certified by a partner of Seller,
and the items  required in the  preceding  clause with respect to any  corporate
general partner of Seller and all affidavits,  indemnities and other  agreements
required by the Title Company to permit it to issue to Buyer the Owner's  Policy
of Title Insurance required pursuant to Paragraph 5(a) hereof.

                           (x) Statements of Operating Expenses.  A statement of
all  operating  expenses  and real estate  taxes for all "base  years" under the
Tenant Leases,  certified by Seller and a certified  public  accountant as being
true and  correct,  with all other  information  necessary or required to permit
Buyer to calculate and collect after the Closing all payments of additional rent
and other charges under the Tenant Leases.

                           (xi)  Up-Dated  Rent Roll.  A schedule in the form of
Exhibit "G" of the rents and other  charges and payments due from tenants  under
the Tenant Leases including,  without limitation,  any which are in arrears, all
dated as of the Closing Date and certified by Seller as true and correct.

                           (xii)  Conveyance of Awards.  All proper  instruments
for the conveyance of the awards referred to in Paragraphs l(a) and 13 hereof.

                           (xiii)  Additional Permits and Certificates.

                                    (A) To the extent in Seller's  possession or
control,  a certificate  issued by the appropriate  officer of the  municipality
wherein the Real Property lies, certifying to the same type of information as if
provided in the  Statement  of  Occupancy  issued  pursuant to the  Philadelphia
Building Code; provided, however, that the foregoing requirement shall be deemed
waived by Buyer if the Real Property is situated in a municipality,  the laws or
ordinances of which do not provide for the issuance of such a certificate.

                                    (B) To the extent in Seller's  possession or
control,  if the Real  Property is not  situated  in a city of the first  class,
second class, or second Class A, a permit issued by the Pennsylvania  Department
of Labor and Industry  pursuant to Act of Assembly of April 27,  1927,  P.L. 465
(35 P.S.  Sections  1221-1235),  as amended,  which permit shall  authorize  the
occupancy or use of the building and all other  structures  on the Real Property
and shall be dated after the date of  completion  of the most  recent  erection,
adaptation, remodeling or alteration of any of such building or structures.

                           (ix)  Plans  and  Specifications.  To the  extent  in
Seller's  possession  or  control,  a set of plans  and  specifications  for the
improvements  which  constitute a part of the Property and all  alterations  and
additions thereto, and a set of project manuals for the Property.

                           (x) Books and Records. Duplicate copies of all books,
records and  operating  reports in Seller's  possession  which are  necessary to
insure continuity of operation of the Property.

                           (xi)  MSDS   Sheets.   To  the  extent  in   Seller's
possession or control,  copies of all material  safety data sheets posted at any
time by Seller at the Property.

                           (xii)  Letters of Credit.  All letters of credit held
by Seller as security for the performance by any tenant of its obligations under
its Tenant  Lease,  together with an  endorsement  to each such letter of credit
issued by the issuer of such letter of credit  naming Buyer or Buyer's  assignee
as beneficiary under such letter of credit.

                           (xiii) Warranties.  All warranties  applicable to the
Property  including,  without  limitation,  those  relating  to the roof and the
heating,  ventilating and air conditioning systems,  together with an assignment
thereof to Buyer.

                           (xix) Other Documents.  Any other documents  required
to be delivered by Seller pursuant to any other provisions of this Agreement.

                  (b) Buyer.  At the Closing,  Buyer shall deliver to Seller the
following:

                           (i) Purchase Price. The portion of the Purchase Price
payable pursuant to Paragraph 2(a)(ii).

                           (ii) Assumption Agreements. Assumption agreements, in
the form of Exhibits "L" and "M"  respectively,  of the Tenant Leases and of the
Service  Agreements  designated  on Exhibit "H" to be  assigned  to Buyer,  duly
executed and acknowledged by Buyer and in proper form for recording.

                           (iii) Other Documents. Any other document required to
be delivered by Buyer pursuant to any other provision of this Agreement.

         16.  Indemnity of Seller.  Seller agrees to indemnify,  defend and hold
harmless Buyer from and against, and to reimburse Buyer with respect to, any and
all claims, demands, causes of action, losses, damages,  liabilities,  costs and
expenses (including,  without limitation,  reasonable  attorney's fees and court
costs) asserted  against or incurred by Buyer by reason of or arising out of (a)
a breach  of any  representation  or  warranty  of  Seller  as set forth in this
Agreement,  and (b) the failure of Seller to perform any obligation  required by
this  Agreement to be  performed  by it. The rights of Buyer to  indemnification
under this Agreement shall not be affected by the fact that Buyer knew or should
have known the true state of facts giving rise to such indemnification,  and the
furnishing of any information to Buyer or its affiliates or  representatives  or
the investigation by Buyer or its affiliates or representatives shall not affect
Buyer's  right  to  rely  on any  representations  or  warranties  made  in this
Agreement.

         17.  Brokerage.  Buyer and Seller  represent  and warrant to each other
that  neither  has  dealt  with any  broker,  finder  or other  intermediary  in
connection with this sale other than Cushman & Wakefield of  Pennsylvania,  Inc.
(the "Broker").  Buyer agrees to pay all brokerage  commission due to the Broker
up to the sum of Two Hundred Fifty  Thousand  Dollars  ($250,000.00).  Buyer and
Seller  otherwise  agree to indemnify,  defend and hold each other harmless from
and against all claims,  demands,  causes of action, loss, damages,  liabilities
costs and expenses  (including,  without  limitation,  attorneys' fees and court
costs)  arising from any claims for  commissions  made by any broker,  finder or
other  intermediary,  other than the Broker, with which either may have dealt in
connection  with this sale,  and the other  party  shall have no  liability,  or
obligation in connection therewith.

         18. No Other  Representations.  Buyer  acknowledges that neither Seller
nor anyone  acting,  or purporting to act, on behalf of Seller,  has,  except as
expressly set forth in this Agreement,  made any representation or warranty with
respect to the Property.

         19. Assignability.  Buyer shall have the right to assign this Agreement
at any time before Closing and its rights  hereunder with Seller's prior written
consent  which shall not be  unreasonably  withheld;  and any  assignee of Buyer
shall be entitled to all of the rights and powers of Buyer hereunder.  Buyer may
assign this Agreement at Closing with or without Buyer's consent.

         20.  FIRPTA.

                  (a) Parties Who Are Not Foreign - Entity  Transferor.  Section
1145 of the Internal Revenue Code of 1986, as amended (the "Code") provides that
a transferee of a United States real property  interest must withhold tax if the
transferor is a foreign person.  To inform Buyer that  withholding of tax is not
required  upon the  disposition  by  Seller  of a United  States  real  property
interest,  the undersigned  parties executing this Agreement on behalf of Seller
hereby certify the following on behalf of Seller:

                           (i)  Seller  is not a  foreign  corporation,  foreign
partnership, foreign trust, or foreign estate (as those terms are defined in the
Code and Income Tax Regulations).

                           (ii) The U.S. employer identification number for Awin
Realty  Company is  23-1706179  and the taxpayer  identification  number for LBA
Associates is 23- 2534044; and

                           (iii)  Seller's  office address is 300 Stevens Drive,
Lester, Pennsylvania 19113-1521.

Seller, and the parties executing this Agreement on behalf of Seller, understand
that this  certification  may be disclosed to the  Internal  Revenue  Service by
Buyer  and that any  false  statement  made  here  could  be  punished  by fine,
imprisonment  or both.  Under  penalties  of perjury,  the  undersigned  parties
executing  this  Agreement on behalf of Seller  declare that they have  examined
this  certification  and to the best of their knowledge and belief,  it is true,
correct and complete;  and they further declare that they have authority to sign
this document on behalf of Seller.

                  (b)  Re-certification at Closing.  The Seller, and the parties
executing this Agreement on behalf of Seller, shall deliver to Buyer at Closing,
a restatement of the above certifications of Seller and of the parties executing
this  Agreement  on behalf of Seller in the form  attached to this  Agreement as
Exhibit "N".

         21.  Notices.

                  (a) All  notices,  demands,  requests or other  communications
required or permitted  under the term of this Agreement shall be in writing and,
unless and until  otherwise  specified in a written  notice by the party to whom
notice is  intended to be given,  shall be sent to the parties at the  following
respective addresses:

                           (i)  if intended for Seller:

                                    300 Stevens Drive
                                    Lester, PA  19113-1521
                                    Attention:Annamarie Donley, Vice President


                           (ii) if intended for Buyer:

                                    443 South Gulph Road
                                    King of Prussia, PA

                           with a copy to:

                                    Adelman Lavine Gold and Levin,
                                    a Professional Corporation
                                    1900 Two Penn Center Plaza
                                    Philadelphia, PA 19102-1799
                                    Attention: Kevin W. Walsh, Esquire

                           (iii) if intended for Escrow Agent:

                                 Certified Abstract Co., Inc.
                                 5 Sentry Parkway East, Suite 107
                                 Blue Bell, PA 19422

Notices may be given on behalf of any party by its legal counsel.

                  (b) Each such notice,  demand,  request or other communication
shall be deemed to have been  properly  given for all purposes if (i)  delivered
against a written  receipt of delivery;  (ii) mailed by  registered or certified
mail of the United States Postal  Service,  return  receipt  requested,  postage
prepaid; or (iii) delivered to a nationally recognized overnight courier service
for next business day delivery,  to its addressee at such party's address as set
forth above.

                  (c) Each such  notice,  demand or  request  shall be deemed to
have been  given  upon the  earlier  of (i)  actual  receipt  or  refusal by the
addressee  or (ii)  deposit  thereof at any main or branch  United  States  post
office if sent in  accordance  with  Paragraph  21(b)(ii)  hereof,  and  deposit
thereof with the courier if sent pursuant to Paragraph 21(b)(iii).

         22.  Miscellaneous.

                  (a)   Captions  and   Headings.   The  captions  and  headings
incorporated  in this  Agreement are inserted for  convenience of reference only
and shall not form any part of this Agreement or affect its interpretation.

                  (b)  Successors and Assigns.  This Agreement  shall be binding
upon and shall inure to the benefit of the parties  hereto and their  respective
heirs, personal representatives, successors and assigns.

                  (c) Entire Agreement;  Governing Law. This agreement  contains
the entire  understanding  of the parties  with  respect to the  subject  matter
hereof,   supersedes   all   prior  or  other   negotiations,   representations,
understandings  and agreements of, by or among the parties,  express or implied,
oral or  written,  which are fully  merged  herein.  The  express  terms of this
Agreement  control and  supersede  any course of  performance  and/or  customary
practice inconsistent with any such terms. Any agreement hereafter made shall be
ineffective  to  change,  modify,  discharge  or effect an  abandonment  of this
Agreement  unless such  agreement is in writing and signed by the party  against
whom  enforcement  of such change,  modification,  discharge or  abandonment  is
sought.  This Agreement shall be governed by and construed under the laws of the
Commonwealth of Pennsylvania.

                  (d) Provisions Separable. The provisions of this Agreement are
independent of and separable from each other, and no provision shall be affected
or rendered  invalid or  unenforceable by virtue of the fact that for any reason
any other provision may be invalid or unenforceable in whole or in part.

                  (e) Waiver of Tender of Deed and Purchase  Monies.  The tender
of an  executed  Deed by Seller  and the  tender by Buyer of the  portion of the
Purchase Price payable at the Closing are mutually  waived,  but nothing in this
Agreement  shall be construed as a waiver of Seller's  obligation to deliver the
Deed and the Bill of Sale and/or of the  concurrent  obligation  of Buyer to pay
the portion of the Purchase Price payable at the Closing.

                  (f) Gender,  etc. Words used in this Agreement,  regardless of
the number and  gender  specifically  used,  shall be deemed  and  construed  to
include any other number,  singular or plural, and any other gender,  masculine,
feminine or neuter, as the context indicates is appropriate.

                  (g) Counterparts. This Agreement may be executed in any number
of counterparts,  each of which shall be deemed to be an original as against any
party  whose  signature  appears  thereon,  and  all  of  which  shall  together
constitute one (1) and the same instrument. This Agreement shall be binding when
one (1) or more counterparts hereof,  individually or taken together, shall bear
the  signatures  of  all of the  parties  reflected  on  this  Agreement  as the
signatories.

                  (h)  Exhibits.  All exhibits  attached to this  Agreement  are
incorporated by reference into and made a part of this Agreement.

                  (i) No Waiver.  Neither  the failure nor any delay on the part
of either  party to this  Agreement  to  exercise  any right,  remedy,  power or
privilege under this Agreement shall operate as a waiver thereof,  nor shall any
single or partial exercise of any right, remedy, power or privilege preclude any
other or further  exercise of the same or of any other right,  remedy,  power or
privilege,  nor shall any waiver or any right,  remedy,  power or privilege with
respect to any  occurrence  be construed as a waiver of any such right,  remedy,
power or  privilege  with  respect to any other  occurrence.  No waiver shall be
effective  unless it is in writing  and is signed by the party  asserted to have
granted such waiver.

                  (j)  Interpretation.  No provision of this  Agreement is to be
interpreted  for or against  either part because that part or that party's legal
representative or counsel drafted such provision.

                  (k)  Time.  Time  is of the  essence  of  this  Agreement.  In
computing the number of days for purposes of this  Agreement,  all days shall be
counted, including Saturdays,  Sundays and holidays;  provided, however, that if
the final  day of any time  period  provided  in this  Agreement  shall end on a
Saturday,  Sunday or legal holiday, then the final day shall extend to 5:00 p.m.
of the next full business  day. For the purposes of this  Paragraph  22(k),  the
term  "holiday"  shall mean a day other than a Saturday or Sunday on which banks
in the  state in which  the Real  Property  is  located  are or may  elect to be
closed.

                  (l) Buyer's  Exercise of Right to Terminate.  If Buyer desires
to  terminate  its  obligations  under  this  Agreement  pursuant  to any of the
provisions hereof, Buyer shall do so by delivering written notice of termination
to Seller,  with a copy to the Escrow Agent,  whereupon,  after delivery of such
notice by Seller to Escrow Agent,  the Deposit and all interest  earned  thereon
shall be paid to Buyer, and except as otherwise  expressly provided herein, this
Agreement  shall be and become  null and void and  neither  party shall have any
further  rights or obligations  under this  Agreement and all original  executed
counterparts of this Agreement shall be returned to Seller for cancellation. Any
dispute(s)  with respect to the  disposition  of the Deposit  following  Buyer's
exercise of any right hereunder to terminate this Agreement shall be resolved in
accordance with the terms of Paragraph 3(b) hereof.

                  (m) Post-Closing  Instructions.  Seller agrees to instruct, or
cause its agents,  servants, or employees to instruct,  Buyer or its designee in
all phases and aspects of the  operation  of the Real  Property,  to disclose to
Buyer all information  concerning the Property reasonably necessary,  convenient
or useful to Buyer,  which  information and instructions are specifically made a
part of the  Property  to be  purchased  hereunder,  and to hold  itself and its
agents,  servants,  representatives,  and employees  available until the Closing
Date  and  from  time to time  thereafter  in order  to  supply  any  additional
information reasonably requested by Buyer regarding the operation,  maintenance,
or management of the Property.

         23. Index to  Definitions.  The definition of each of the following def
ined terms is contained in the Paragraph of this Agreement set forth below:

         Defined Term                              Paragraph
         ------------                              ---------

         Act 319                                   8(dd)
         Act 515                                   8(dd)
         ADA                                       8(s)
         Bill of Sale                              6(a)
         Broker                                            17
         Buyer                                     Preamble
         Casualty                                  12(b)
         Casualty Notice                           12(b)
         Closing                                   4(a)
         Closing Date                              4(b)
         Code                                      20(a)
         Contaminant                               11(a)(ii)
         Deed                                      6(a)
         Defect Notice                             8(n)
         Deposit                                   2(a)(i)
         Environmental Laws                        ll(a)(i)
         Escrow Agent                              2(a)(i)
         Excluded Items of Personal                l(b)
              Property
         Existing Mortgage                         8(n)
         Holiday                                   22(k)
         Inspection Period                         14(c)
         Lease Broker                              8(k)
         Owner's Policy of Title                   5(a)
            Insurance
         PCBs                                      11 (a) ( ii)
         Permitted Encumbrances                    5(a)
         Personal Property                         l(b)
         Policy                                    8(t)
         Property                                  l(c)
         Purchase Price                                    2(a)
         Real Property                             l(a)
         Recorded Agreements                               8(cc)
         Reimburseable Costs                       3(a)(ii)
         Seller                                    Preamble
         Service Agreements                        8(o)
         Taking                                            8(x)
         Tenant Leases                             8(a)
         Tenant Estoppel Certificate               10(h)
         Title Company                             5(a)
         Violation                                 8(s)
         Waters of the Commonwealth                ll(a)(v)
            of Pennsylvania
         Waters of the United States               ll(a)(v)
         Wetland                                   ll(a) (v)

In  addition,  certain  defined  terms  in the  form of  acronyms  or  shortened
statutory names for statutes or  governmental  agencies which are referred to in
Paragraph 11 are defined in that Paragraph.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

         IN WITNESS  WHEREOF,  intending to be legally  bound,  the parties have
executed  this  Agreement  as a sealed  instrument  as of the day and year first
above written.

                                     SELLER:

Attest:                              ADWIN REALTY COMPANY,
                                     a Pennsylvania corporation


_____________________                By:_________________________
[corporate seal]                           Name:
                                           Title:

                                     LBA ASSOCIATES
                                     By: ADWIN REALTY COMPANY


                                          By:_________________________
                                                A General Partner

                                     ADWIN INVESTMENT CO.


                                     By:___________________________
                                          A General Partner


                                     BUYER:


Witness:____________________                         ____/s/____________________
                                                     J. BRIAN O'NEILL



                                JOINDER OF BROKER

                  The undersigned, the broker referred to in Paragraph 17 of the
foregoing  Agreement of Sale and Purchase,  acknowledges  and agrees that Seller
shall have no  liability to the  undersigned  for payment of any  commission  or
other  compensation in connection  with the Agreement of Sale and Purchase,  the
sale of the Property,  or in connection with any financing  obtained by Buyer to
complete its acquisition of the Property, except as specifically provided in the
foregoing  Agreement  and Sale of  Purchase.  The  undersigned  consents  to the
provisions of Paragraph 17 of the foregoing Agreement of Sale and Purchase.

                  Intending to be legally bound, the undersigned has caused this
Joinder of Broker to be executed the ______ day of February, 1996.


                                            CUSHMAN & WAKEFIELD OF
                                            PENNSYLVANIA, INC.,
                                            a Pennsylvania corporation



                                            By: ____________________________
                                                  WILLIAM LUFF, Branch Manager

                                    EXHIBITS

         Exhibit "A"       Legal Description of Real Property
         Exhibit "B"       List of Personal Property
         Exhibit "C"       Excluded Items of Personal Property
         Exhibit "D"       Permitted Title Encumbrances
         Exhibit "E"       Bill of Sale
         Exhibit "F"       Fees to be Apportioned at Closing
         Exhibit "G"       Rent Roll
         Exhibit "H"       Service Agreements
         Exhibit "I"       Policy
         Exhibit "J"       Statement of Income and Expense by Seller
         Exhibit "K"       Tenant Estoppel Certificate
         Exhibit "L"       Assignment and Assumption of Tenant Leases
         Exhibit "M"       Assignment and Assumption of Service Agreements
         Exhibit "N"       FIRPTA Affidavit1

                                   EXHIBIT "A"

                       LEGAL DESCRIPTION OF REAL PROPERTY

                                  See attached.



                                   EXHIBIT "B"

                            LIST OF PERSONAL PROPERTY

                                  See attached.



                                   EXHIBIT "C"

                       EXCLUDED ITEMS OF PERSONAL PROPERTY

                                  See attached.



                                   EXHIBIT "D"

                           PERMITTED TITLE ENCUMRANCES

                                  See attached.



                                   EXHIBIT "E"

                                  BILL OF SALE


                          SCHEDULE "A" TO BILL OF SALE

                       LEGAL DESCRIPTION OF REAL PROPERTY

                                  See attached.

                          SCHEDULE "B" TO BILL OF SALE

                                PERSONAL PROPERTY

                                  See attached.

                                  SCHEDULE "F"
                    LICENSE FEES TO BE APPORTIONED AT CLOSING




                                   EXHIBIT "G"

                                    RENT ROLL

                                  See attached.



                                   EXHIBIT "H"

                               SERVICE AGREEMENTS

                                  See attached.


                                   EXHIBIT "I"

                                     POLICY

                                  See attached.



                                   EXHIBIT "J"

                         STATEMENT OF INCOME AND EXPENSE

                                  See attached.



                                   EXHIBIT "K"

                           TENANT ESTOPPEL CERTIFICATE

                                  See attached.



                                   EXHIBIT "L"

                   ASSIGNMENT AND ASSUMPTION OF TENANT LEASES



                         SCHEDULE "A" TO ASSIGNMENT AND
                           ASSUMPTION OF TENANT LEASES

                                     LEASES



                                   EXHIBIT "M"

                       ASSIGNMENT AND ASSUMPTION AGREEMENT



               SCHEDULE "A" TO ASSIGNMENT AND ASSUMPTION AGREEMENT

                               SERVICE AGREEMENTS



                                  SCHEDULE "N"

                                FIRPTA AFFIDAVIT