WINSTAR COMMUNICATIONS INC
8-K, 1998-06-25
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of Report (Date of earliest event reported) June 2, 1998


                          WINSTAR COMMUNICATIONS, INC.
               --------------------------------------------------
               (Exact Name of Registrant as Specified in Charter)



   Delaware                        1-10726                  13-3585278
- ----------------              ----------------             -------------
(State or Other               (Commission File             (IRS Employer
Jurisdiction of                File Number)                Identification
Incorporation)                                              No.)



  230 Park Avenue, New York, New York                            10169
- ----------------------------------------                    -----------------
(Address of Principal Executive Offices)                       (Zip Code)



Registrant's telephone number, including area code:(212) 687-7577



                               Not Applicable
        ------------------------------------------------------------
        (Former Name or Former Address, if Changed Since Last Report)






 


<PAGE>


Item 5.           Other Events.

         On June 2, 1998, pursuant to agreements entered into on April 24, 1998,
[Registrant], through two limited liability companies of which Registrant is the
sole member,  acquired  3,313,864  shares of the common stock of Advanced  Radio
Telecom Corp.  ("ART") and certain other  unrelated  assets from two sellers not
otherwise  affiliated  with ART in  consideration  for an aggregate of 1,525,301
shares of common  stock of  Registrant.  ART is a  provider  of  broadband  data
services to  businesses  not served by fiber optic  networks.  Based on publicly
available information, Registrant understands that ART possesses 38 Ghz licenses
which  cover 90 of the 100  largest  metropolitan  markets in the United  States
(giving  effect to certain  pending  acquisitions).  The ART shares  acquired by
Registrant  constitute  approximately  12.4% of the  outstanding  shares  of ART
common stock.

Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

         (a)      Financial Statements.

                           Not applicable.

         (b)      Pro Forma Financial Information.

                           Not applicable.

         (c)      Exhibits.

  10.1. Stock Purchase Agreement dated April 24, 1998, among Registrant, WinStar
LHC1 LLC and James J. Pinto.

  10.2.  Agreement  and  Plan of  Reorganization  dated  April  24,  1998  among
Registrant,  WinStar LHC1 LLC, WinStar LHC2 LLC, Landover  Holdings  Corporation
and Laurence S. Zimmerman.

  10.3. Indemnity Agreement dated April 24, 1998 among Registrant,  WinStar LHC1
LLC, WinStar LHC2 LLC, Landover Holdings Corporation and Laurence S. Zimmerman.


                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


Dated: June 25, 1998                          WINSTAR COMMUNICATIONS, INC.
                                              ----------------------------
                                                    (Registrant)


                                               /s/ Frederic E. Rubin
                                               ----------------------------
                                               Frederic E. Rubin
                                               Vice President and Treasurer




                                        2


<PAGE>



                            STOCK PURCHASE AGREEMENT


         AGREEMENT  dated April 24, 1998 among WINSTAR  COMMUNICATIONS,  INC., a
Delaware corporation ("WinStar"), WINSTAR LHC1 LLC, a New York limited liability
company of which  WinStar is the sole  member  ("WinLLC1"),  and JAMES J. PINTO,
residing at 366 Round Hill Road, Greenwich, Connecticut 06830 ("Seller").

         WHEREAS,  Seller is the owner of 560,231 of the outstanding shares (the
"Shares") of common stock,  par value $.001 per share, of Advanced Radio Telecom
Corp. ("ARTT"); and

         WHEREAS,  Seller  desires to sell certain of such shares to WinLLC1 and
WinLLC1  desires to purchase such shares from Seller on the terms and conditions
set forth herein;

         IT IS AGREED:

1. Sale of Shares; Consideration.

     (a) Subject to the terms and conditions of this  Agreement,  on the Closing
Date (as hereinafter defined) Seller shall sell, transfer,  assign and convey to
WinLLC1 555,000 shares of the common stock of ARTT (the  "Shares"),  and WinLLC1
shall  purchase  the Shares  from  Seller.  As used  herein,  the term  "Shares"
includes the associated  preferred  stock purchase rights issued pursuant to the
Rights Agreement dated June 20, 1997 between ARTT and Continental Stock Transfer
& Trust Company (the "ARTT Rights Plan").

     (b) The  consideration  payable to Seller  for the Shares  shall be 252,272
shares of the common stock,  par value $.01 per share,  of WinStar (the "WinStar
Shares"),  plus the  "Adjustment  Shares" (as defined in Section 1(c)),  if any,
which may be issued  pursuant  to  Section  1(c).  The  WinStar  Shares  and the
Adjustment Shares shall be issued by WinStar to Seller.

     (c) If, within eighteen months after the Closing Date, WinStar, directly or
indirectly,  (i) acquires at least 80% of the outstanding shares of common stock
of ARTT,  or (ii)  acquires  all or  substantially  all of the assets of ARTT or
enters into a merger or other business  combination with ARTT the consequence of
which is that WinStar, directly or indirectly,  becomes the sole owner of all or
substantially  all of the assets of ARTT ( any event under  clauses (i) and (ii)





<PAGE>


being an "ARTT Business  Combination") for an "average price per share" paid for
shares of common  stock of ARTT other than the Shares  greater  than  $20.00 per
share (the "Benchmark Price"), then WinStar shall issue to Seller that number of
shares of common stock of WinStar ("Adjustment  Shares") equal to the difference
between such  "average  price per share" and the Benchmark  Price  multiplied by
555,000 and divided by the "Adjustment Price" (as hereinafter defined),  rounded
to the  nearest  whole  share.  Such  issuance  shall be made on the  date  (the
"Adjustment  Closing  Date")  which is the fifth  business day after the date on
which  WinStar  consummates  the  ARTT  Business  Combination.  As used  herein,
"Adjustment  Price" shall mean the average of the last sale prices of the common
stock of WinStar  reported on the Nasdaq  National  Market  ("NNM") for the five
consecutive  trading days ending on the date on which  WinStar  consummates  the
ARTT Business Combination. For purposes of this Section 1(c), in determining the
"average  price  per  share" of any  shares  of  common  stock of ARTT for which
payment is made with  shares of common  stock of WinStar,  such common  stock of
WinStar shall be valued at the average of the last sale prices of WinStar common
stock  reported on the NNM for the five  consecutive  trading days ending on the
date of such purchase by WinStar.  In the event of an ARTT Business  Combination
pursuant to the preceding  clause (ii),  the "average  price per share" shall be
the  value  of the  aggregate  consideration  paid  by  WinStar  to  ARTT or its
stockholders  in  such  ARTT  Business  Combination  divided  by the  number  of
outstanding   shares  of  common  stock  of  ARTT,  with  any  portion  of  such
consideration  which is paid for with  shares of common  stock of WinStar  being
valued at the average of the last sale prices of WinStar  common stock  reported
on the NNM for the  five  consecutive  trading  days  ending  on the date of the
consummation  of  such  ARTT  Business  Combination.   If  any  portion  of  the
consideration  paid by WinStar to ARTT or its stockholders is paid other than in
cash or with  shares  of common  stock of  WinStar,  for  purposes  hereof  such
consideration  shall be valued at its fair  market  value.  Notwithstanding  the
foregoing or anything else in this  Agreement,  WinStar shall have no obligation
to acquire any ARTT  securities and has made no  representation  that it has any
present or future  intent to acquire any ARTT  securities  other than the Shares
and  the  shares  to be  acquired  by  WinLLC1  pursuant  to the  Reorganization
Agreement (as hereinafter defined).

     (d) Solely at WinLLC1's  election  pursuant to Section  5(i), if Seller has
obtained the necessary  consents therefor,  Seller shall assign to WinLLC1,  and
WinLLC1 shall assume,  the obligations of Seller pursuant to Second Restated and
Amended  Registration  Rights Agreement dated July 3, 1996, among ARTT, Advanced
Radio Technologies  Corporation ("ARTC"), the stockholders and warrantholders of
ARTT  and the  stockholders and warrantholders of ARTC (the "Registration Rights




<PAGE>



Agreement").

     (e) All share and  share-related  amounts and figures  described  hereunder
shall be appropriately adjusted from time to time to account for and give effect
to any reclassifications,  stock splits, stock dividends, share combinations and
similar  changes  affecting the common stock of WinStar as a whole or the common
stock of ARTT as a whole and all holders thereof.

2. Closing.

     (a) Subject to the terms and conditions of this Agreement, the consummation
of the transactions contemplated by this Agreement shall take place at a closing
(the  "Closing")  to be held at 10:00  a.m.,  New York City time,  at a mutually
agreeable  location  in New York  City,  on a date  ("Closing  Date") as soon as
practicable  following the  satisfaction  or waiver of the conditions to Closing
set forth in Section 6 hereof.

     (b) At the Closing,  Seller shall deliver to (i) WinLLC1,  certificates rep
resenting the Shares,  duly executed in form for transfer by the record  holders
thereof or with duly executed  stock powers  therefor,  not bearing  restrictive
legends of any nature other than legends  referring to  restrictions  imposed by
Federal  and  state  securities  laws and free and clear of any  liens,  claims,
charges,  restrictions,  security  interests or other  encumbrances of any kind,
including,  without limitation,  encumbrances created by option,  voting rights,
buy-sell,  stockholder or other agreements of any kind whatsoever  affecting the
Shares (collectively, "Encumbrances") other than Encumbrances resulting from the
actions or omissions of WinStar or WinLLC1  ("WinStar  Encumbrances")  and those
imposed by Federal and state securities laws, and (ii) WinStar and WinLLC1,  the
certificates  and other  documents  required to be delivered by Seller  pursuant
hereto.

     (c) At  the  Closing,  WinStar  and  WinLLC1  (collectively,  the  "WinStar
Parties")  shall deliver to Seller (i) a certificate  for 228,132 of the WinStar
Shares,  and (ii) the certificates and other documents  required to be delivered
by the WinStar  Parties  pursuant  hereto and shall  deliver to the escrow agent
referred to in Section 7(c) a certificate for the balance of the WinStar Shares.
The  certificates  for the  WinStar  Shares  and any  Adjustment  Shares  issued
hereunder shall bear the legends (the "Legends") set forth in Schedule A annexed
hereto.




<PAGE>



3.  Representations and Warranties of Seller.  Seller represents and warrants to
the WinStar  Parties as follows and  acknowledges  that the WinStar  Parties are
relying upon such representa tions and warranties:

     (a) This Agreement  constitutes the valid and binding obligation of Seller,
enforceable in accordance with its terms,  except as the enforceability  thereof
may be limited by any applicable bankruptcy,  insolvency or other laws affecting
creditors'  rights generally or by general  principles of equity,  regardless of
whether such  enforceability  is  considered in equity or at law and except that
enforceability of any indemnification provision may be limited under Federal and
state securities laws.

     (b) The  execution,  delivery and  performance  of this Agreement by Seller
does not and will not (i) violate or result in any default under or give rise to
any right of termination,  revocation or modification of any indenture,  license
or other agreement to which Seller is a party or to which the Shares are subject
or (ii) violate or result in any default under any law, regulation, order, writ,
judgment or decree applicable to Seller or the Shares or by which the ability of
Seller to consummate the  transactions to be consummated by them hereunder would
be adversely affected as a consequence of such violation or default.

     (c)  (i) Subject to the Registration Rights Agreement, Seller has the sole,
          entire and  unfettered  right to transfer the Shares to WinLLC1,  free
          and clear of any Encumbrance whatsoever and subject to no restrictions
          with respect to the transferability  thereof.  Upon acquisition of the
          Shares  by  WinLLC1,  WinLLC1  will  be  able to  vote,  transfer  and
          otherwise  dispose of the Shares without  restriction other than those
          imposed  by  Federal  and state  securities  laws and those  under the
          Registration Rights Agreement, if assumed by WinLLC1.

     (ii) Seller is the "beneficial owner" (as defined in Rule 13d-3 promulgated
          under  the  Securities  and  Exchange  Act of 1934,  as  amended  (the
          "Exchange  Act")) of the  Shares,  free and clear of all  Encumbrances
          except  as set  forth  in  Schedule  B  annexed  hereto,  all of which
          Encumbrances shall terminate and be null, void and of no effect on and
          after the Closing other than those imposed by the Registration  Rights
          Agreement  (if  assigned to and  assumed by  WinLLC1)  and Federal and
          state  securities  laws.  No person or entity  has any option or other
          right to purchase the Shares or  otherwise  obtain any interest in the
          Shares from Seller.




<PAGE>



          The sale and  transfer  of the  Shares  to  WinLLC1  pursuant  to this
          Agreement will not give any person or entity a legal right or cause of
          action against the Shares or any of the WinStar  Parties except as may
          result from a breach by a WinStar  Party of an  obligation to which it
          is subject. Upon consummation of the transactions contemplated hereby,
          WinLLC1  will  hold  the  Shares  free and  clear of any  Encumbrance,
          including any rights of any other person or entity  whatsoever,  other
          than  WinStar  Encumbrances,   those  imposed  by  Federal  and  state
          securities  laws and,  if  assigned  to and  assumed by  WinLLC1,  the
          Registration Rights Agreement.

     (iii)The Shares are validly issued,  fully paid and non-assessable and were
          issued in compliance with all Federal and state  securities  laws. The
          Shares  constitute  the only shares of capital  stock of ARTT of which
          Seller is the beneficial owner other than 5,231 shares of common stock
          of ARTT. For purposes of Rule 144 ("Rule 144")  promulgated  under the
          Securities Act of 1933, as amended (the "1933 Act"),  Seller is not an
          "affiliate"  (as defined in Rule 144) of ARTT and has not been such an
          affiliate  within  three  months  prior to the date  hereof and Seller
          acquired  the Shares no later  than the dates set forth in  Schedule C
          except  for those  thereof  listed in  Schedule  C as being  free from
          restriction under Rule 144.

     (d)  Seller  is not in  violation  of any  mortgage,  indenture,  contract,
agreement,  instrument,  judgment, decree, order, statute, rule or regulation or
writ or decree of any court,  governmental agency or instrumentality to which he
is subject,  a violation  of which would have a material  adverse  effect on his
ability to perform his obligations under this Agreement.

     (e) The execution and delivery of this  Agreement by Seller do not, and the
performance  of  this  Agreement  and  the   consummation  of  the  transactions
contemplated  hereby  by  Seller  will  not,  require  any  consent,   approval,
authorization  or other  action  by,  or filing  with or  notification  to,  any
governmental  or regulatory  authority or other third party other than notice to
ARTT pursuant to the  Registration  Rights  Agreement  and, if the  Registration
Rights  Agreement is assigned to and assumed by WinLLC1,  a counterpart  of such
agreement  signed  by  WinLLC1  required  to be given to ARTT  pursuant  to such
agreement.

     (f) Seller knows of no facts or  circumstances  which could  reasonably  be
expected  to  have a  material  adverse  effect  upon  the  business,  condition





<PAGE>


(financial  or  otherwise)  or  prospects  of ARTT which have not been  publicly
disclosed.

     (g) No  representation or warranty by Seller contained in this Agreement or
other instrument furnished or to be furnished to the WinStar Parties pursuant to
this  Agreement  or in  connection  with the  transactions  contemplated  hereby
contains any untrue  statement  of a material  fact or omits to state a material
fact necessary in order to make the statements  contained herein or therein,  in
light of the circumstances under which they were made, not misleading.

     (h) The WinStar Shares and Adjustment  Shares will be acquired for Seller's
account and not with a view towards  distribution  thereof.  Seller  understands
that he must bear the economic risk of an  investment in the WinStar  Shares and
the Adjustment Shares, which cannot be sold by Seller unless they are registered
under  the  1933  Act or an  exemption  therefrom  is  available.  Seller  is an
"Accredited Investor" as defined in Regulation D promulgated under the 1933 Act.
Seller has had both the  opportunity  to ask questions and receive  answers from
the officers  and  directors  of the WinStar  Parties and all persons  acting on
their behalf  concerning the business and operations of the WinStar  Parties and
to obtain any additional information,  to the extent the WinStar Parties possess
or may possess such information or can acquire it without unreasonable effort or
expense,   necessary  to  verify  the  accuracy  of  such  information.   Seller
acknowledges  receiving  from WinStar and reviewing  WinStar's  Annual Report on
Form 10-K for the fiscal year ended December 31, 1997 ("10-K"),  WinStar's Proxy
Statement for its Annual Meeting of  Stockholders  held on June 26, 1997 ("Proxy
Statement"), WinStar's Current Reports on Form 8-K filed with the Securities and
Exchange  Commission  ("Commission")  since January 1, 1998, which are listed on
Schedule D annexed hereto (the "8-Ks" and,  together with the l0-K and the Proxy
Statement,  the "WinStar  SEC  Filings")  and  WinStar's  Confidential  Offering
Circulars dated March 13, 1998 and March 17, 1998.

     (i) Seller is not a member of a "group"  (within  the meaning of Rule 13d-5
under the Exchange  Act) with respect to the  securities  of ARTT with any other
person or entity.

     (j)  The  representations  and  warranties  of  Seller  set  forth  in this
Agreement  shall  survive  until one year from the Closing  Date except that the
representations  and warranties set forth in Section 3(c) shall survive  without
limitation as to time.





<PAGE>



4.  Representations  and Warranties of the WinStar Parties.  The WinStar Parties
jointly and severally represent and warrant as follows to Seller and acknowledge
that Seller is relying upon such representations and warranties:

     (a)  (i) WinStar (A) is a corporation duly organized,  validly existing and
          in good standing under the laws of the State of Delaware,  (B) has all
          the requisite  power to own,  lease and operate its  properties and to
          carry on its business as now being conducted and (C) has all necessary
          power and  authority to enter into this  Agreement  and to perform its
          obligations as contemplated hereby.

     (ii) WinLLC1 (A) is a limited  liability  company duly  organized,  validly
          existing and in good standing under the laws of the State of New York,
          (B)  has  all the  requisite  power  to own,  lease  and  operate  its
          properties and to carry on its business as now being conducted and (C)
          has all necessary power and authority to enter into this Agreement and
          to perform its obligations as contemplated hereby.

     (iii)All action  necessary to be taken by the WinStar  Parties to authorize
          the  execution,  delivery and  performance  of this  Agreement and all
          other agreements and instruments  delivered and to be delivered by the
          WinStar  Parties  in  connection  herewith  has been duly and  validly
          taken. This Agreement  constitutes the valid and binding obligation of
          each of the WinStar Parties, enforceable in accordance with its terms,
          except as the enforceability  thereof may be limited by any applicable
          bankruptcy,  insolvency  or other  laws  affecting  creditors'  rights
          generally or by general  principles  of equity,  regardless of whether
          such enforceability is considered in equity or at law, and except that
          enforceability of any  indemnification  provision may be limited under
          Federal and state securities laws.

     (b) The  execution,  delivery  and  performance  of this  Agreement  by the
WinStar  Parties do not and will not (i) violate or result in any default  under
any provision of their respective Articles of Organization, Operating Agreement,
Certificate of Incorporation  or By-Laws,  (ii) violate or result in any default
under or give rise to any right of  termination,  revocation or  modification of
any indenture, license or other agreement to which any of the WinStar Parties is
a party or (iii)  violate or result in any  default  under any law,  regulation,





<PAGE>


order,  writ,  judgment or decree applicable to any of the WinStar Parties or by
which the ability of any of the WinStar  Parties to consummate the  transactions
to be consummated by them hereunder would be adversely affected as a consequence
of such violation or default.

     (c) The execution and delivery of this Agreement by the WinStar  Parties do
not,  and  the  performance  of  this  Agreement  and  the  consummation  of the
transactions  contemplated  hereby by the WinStar Parties will not,  require any
consent,  approval,  authorization  or  other  action  by,  or  filing  with  or
notification to, any  governmental or regulatory  authority or other third party
other.

     (d)  None  of the  WinStar  Parties  is in  violation  of any  term  of its
respective  Articles  of  Organization,   Operating  Agreement,  Certificate  of
Incorporation or By-Laws or the provisions of any mortgage, indenture, contract,
agreement,  instrument,  judgment, decree, order, statute, rule or regulation or
writ or decree of any court,  governmental agency or instrumentality to which it
is subject,  a violation  of which would have a material  adverse  effect on its
ability to perform its obligations under this Agreement.

     (e) The Shares will be acquired by WinLLC1 for its own account and not with
a view towards distribution thereof.

     (f) The WinStar Shares and the Adjustment  Shares are duly  authorized and,
upon issuance to Seller in accordance with the terms of this Agreement,  will be
validly  issued,  fully  paid and  non-assessable  and,  based  solely  upon the
representations and warranties of Seller contained herein,  issued in compliance
with  all  Federal  and  state  securities  laws  and  free  and  clear  of  all
Encumbrances other than those imposed as set forth in the Legends.

     (g) Each of the WinStar SEC Filings,  including  the  financial  statements
contained therein,  as of their filing dates,  complied in all material respects
with the requirements of the rules and regulations promulgated by the Commission
with respect thereto and did not contain any untrue statement of a material fact
or omit to state a material fact  required to be stated  therein or necessary in
order to make the statements  therein, in light of the circumstances under which
they were made,  not  misleading.  Since the date of filing of the most recently
filed of the WinStar SEC Filings,  there has been no material  adverse change in





<PAGE>



the   business  or   financial   condition   of  WinStar   which  has  not  been
publicly disclosed.

     (h) The  representations and warranties of the WinStar Parties set forth in
this  Agreement  shall  survive until one year from the Closing Date except that
the  representations  and warran ties set forth in Sections  4(f) shall  survive
without limitation as to time.

5. Additional Agreements.

     (a) From the date  hereof  until the  earlier  of the  Closing  Date or the
termination of this Agreement in accordance with the provisions  hereof,  Seller
shall not sell,  assign,  or otherwise dispose of or place or allow to be placed
any  Encumbrance  upon any of the  Shares,  except to the LLCs  pursuant to this
Agreement.

     (b)  Seller  shall pay all  documentary  transfer,  sales  and other  taxes
arising out of the sale and transfer of the Shares to WinLLC1.

     (c)  From  the  date  hereof  through  the  Closing  Date  or  the  earlier
termination of this Agreement, Seller, on the one hand, and the WinStar Parties,
on the other hand (each a  "Representing  Party"),  shall give the other  prompt
written notice of any event or  development  that occurs that (i) had it existed
or been known on the date hereof would have been required to be disclosed by the
Representing   Party  under  this  Agreement,   (ii)  would  cause  any  of  the
representations  and warranties of the Representing Party contained herein to be
inaccurate,  incomplete or otherwise  misleading in any material respect,  (iii)
would cause the  Representing  Party to conclude  that any of the  conditions to
Closing  set forth in  Section 6 hereof  cannot  be  satisfied,  or (iv) is of a
nature that would or could  reasonably  be  considered  to adversely  affect the
ability of the Representing Party to consummate the transactions contemplated by
this Agreement.

     (d) Subject to the terms and conditions of this Agreement, each party shall
cooperate with the other and shall use all reasonable  efforts to take, or cause
to be taken,  all actions and to do, or cause to be done, all things  necessary,
proper  or  advisable  to  consummate  the  transactions   contemplated  hereby,
including the execution and delivery of any additional  instruments necessary to
consummate  the  transactions  contemplated  hereby.  Each of the parties  shall





<PAGE>


execute such documents and other papers and take such further  actions as may be
reasonably required or desirable to carry out the provisions hereof. Each of the
parties shall use its best efforts to cause the conditions to Closing  specified
in Section 6 which are within its control to be fulfilled.

     (e) Within 60 days after the Closing Date, WinStar will file a registration
statement  to register  all of the WinStar  Shares  under the 1933 Act to enable
Seller to make a public  sale of the WinStar  Shares  (including  those  WinStar
Shares  deposited in escrow pursuant to Section 7(c)). If Adjustment  Shares are
issued,  within 60 days after the date of such  issuance,  WinStar shall use its
best efforts to file a registration  statement to register all of the Adjustment
Shares  under  the  1933  Act to  enable  Seller  to make a  public  sale of the
Adjustment  Shares.  WinStar will use its reasonable  best efforts to cause such
registration   statement(s)  to  become  effective  as  promptly  as  reasonably
practicable  after filing and to remain effective until such time as the WinStar
Shares  and the  Adjustment  Shares,  as the case may be,  may be sold  publicly
without  registration  under the 1933 Act. It shall be a  condition  to any such
registration  that Seller provide to WinStar all  information and documents with
respect to his ownership of the WinStar Shares and Adjustment Shares, compliance
with law, manner of proposed disposition and such other matters as WinStar shall
reasonably  request for disclosure in the  registration  statement.  WinStar and
Seller  shall  indemnify  one  another in the  manner and to the extent  that is
customary in connection with such registrations.  WinStar shall pay all expenses
attendant to the  preparation  and filing of such  registration  statement other
than the fees and expenses of counsel and  accountants  of Seller and  brokerage
discounts and commissions.

     (f) From the date hereof  until two years from  either the Closing  Date or
earlier  termination of this  Agreement  pursuant to the provisions of Section 8
hereof,  except  pursuant  to  this  Agreement,  neither  Seller  nor any of his
Affiliates  (other than the Trustees under the Voting Trust Agreement  acting in
capacities  other than as such  Trustees)  or any group  (within the meanings of
Rule 13d-5  under the  Exchange  Act and the Voting  Trust  Agreement)  of which
Seller is or becomes a member will,  directly or indirectly,  either alone or in
concert with others in any manner acquire, agree to acquire or make any proposal
to  acquire,  for  his  own  account,  by  purchase  or  otherwise,  any  voting
securities,  options,  warrants or securities convertible into or exercisable or
exchangeable for voting securities of ARTT.





<PAGE>


     (g) From the date hereof  until two years from  either the Closing  Date or
the earlier  termination of this Agreement pursuant to the provisions of Section
8 hereof,  Seller shall not  participate in any manner,  directly or indirectly,
individually  in concert with others,  (i) make or in any way participate in any
"solicitation"  of  "proxies" to vote (as such terms are used in the proxy rules
of the  Commission  promulgated  under  the  Exchange  Act) or seek to advise or
influence  any  person or  entity  with  respect  to the  voting  of any  voting
securities  of  WinStar,  (ii)  otherwise  seek  representation  on the Board of
Directors ("Board") or to control or influence the management, Board or policies
of WinStar, (iii) disclose to any third party any intention, plan or arrangement
inconsistent  with the  foregoing or (iv) advise,  assist or encourage any other
person in connection with the foregoing.

     (h) Each party shall be solely  responsible  for the payment of the fees of
all brokers,  finders,  investment  bankers and similar parties engaged by it in
connection with the transactions contemplated by this Agreement.

     (i)  Promptly  after the  execution  of this  Agreement,  Seller  shall use
reasonable  efforts to obtain the consents  necessary to permit him to assign to
WinLLC1,  and if such consents are  obtained,  at WinLLC1's  election,  given to
Seller at least two  business  days prior to the Closing  Date,  shall assign to
WinLLC1,  his rights and obligations under the Registration Rights Agreement and
WinLLC1,  pursuant to Section 15 of the  Registration  Rights  Agreement,  shall
exercise a  counterpart  to the  Registration  Rights  Agreement  agreeing to be
treated thereunder in the same manner as Seller.

     (j)  Concurrently  with the execution of this Agreement,  counsel to Seller
shall deliver to ARTT an opinion of counsel,  addressed to ARTT, stating that in
the  opinion  of such  counsel  the  transfer  of the  Shares  pursuant  to this
Agreement does not involve a transaction requiring registration or qualification
of the  Shares  under the 1933 Act or the  securities  or "blue sky" laws of any
state of the United States.  Seller hereby  represents  that the requirement set
forth in the first two  sentences of Section  12(c) of the  Registration  Rights
Agreement  that ARTT be given  prior  written notice of a holder's  intention to
make a  "Transfer"  of  "Restricted  Shares"  (as those terms are defined in the
Registration  Rights Agreement) shall be satisfied by the delivery of an opinion
of counsel concurrently with the Transfer.

     (k) WinLLC1  will not sell or  otherwise  transfer or dispose of the Shares
except pursuant to an effective  registration statement pursuant to the 1933 Act
or an exemption from the registration requirements thereof.




<PAGE>



6. Conditions to Closing.

     (a) The  respective  obligations  of  Seller  and the  WinStar  Parties  to
consummate  the transfer and  acquisition  of the Shares shall be subject to the
fulfillment at or prior to the Closing Date of the following conditions:

     (i)  There shall not be in effect any order,  decree or injunction (whether
          preliminary,  final or appealable) of a United States Federal or state
          court of competent jurisdiction, no rule or regulation shall have been
          enacted or adopted by any  governmental  authority  or agency,  and no
          action or  proceeding  shall be pending or threatened by any person or
          entity other than a party hereto that  prohibits  consummation  of the
          transfer and acquisition of the Shares, or any of them, to WinLLC1.

     (ii) All  governmental  approvals  required  for  the  consummation  of the
          transfer and acquisition of the Shares shall have been granted.

     (b) The obligation of the WinStar  Parties to consummate the acquisition of
the  Shares  shall be subject to the  satisfaction  or waiver,  on or before the
Closing Date, of each of the following conditions:

     (i)  The  representations  and  warranties  of  Seller  contained  in  this
          Agreement  shall be true and  correct on and as of the  Closing  Date,
          with the same force and effect as if made as of the Closing Date.

     (ii) All the covenants  contained in this  Agreement to be complied with by
          Seller on or before the Closing Date shall have been complied with.

     (iii)The WinStar  Parties  shall have  received a  certificate  executed by
          Seller to the effect set forth in Sections 6(b)(i) and (ii).

     (iv) Seller shall have made the deliveries  required by Section 2(b) hereof
          and shall have  executed  and  delivered  to the  WinStar  Parties the
          Escrow Agreement referred to in Section 7(c).




<PAGE>


        

     (v)  The   transactions   contemplated   by  the   Agreement  and  Plan  of
          Reorganization dated April 24, 1998, among WinStar,  WinLLC1,  WinStar
          LHC2 LLC,  Landover  Holdings  Corporation  and Laurence S.  Zimmerman
          ("Reorganization  Agreement")  shall have been consummated prior to or
          concurrently  with  the  Closing  or  the  WinStar  Parties  shall  be
          satisfied,  in their sole  judgment,  that such  transactions  will be
          consummated.

     (vi) Neither Seller nor ARTT shall have  commenced any case,  proceeding or
          other action (A) relating to bankruptcy, insolvency, reorganization or
          relief of debtors,  seeking to have an order for relief  entered  with
          respect to it, or seeking to adjudicate it a bankrupt or insolvent, or
          seeking   reorganization,    arrangement,   adjustment,   liquidation,
          dissolution,  composition  or other  relief with  respect to it or its
          debts, or (B) seeking appointment of a receiver, trustee, custodian or
          other similar  official for it or for all or any  substantial  part of
          its property,  or shall have made a general assignment for the benefit
          of its  creditors,  and there  shall not have been  commenced  against
          Seller  or ARTT  any  case,  proceeding  or other  action  of a nature
          referred  to in clause (A) above or seeking  issuance  of a warrant of
          attachment, execution, distraint or similar process against all or any
          substantial  part of its  property,  which case,  proceeding  or other
          action (x)  results in the entry of an order for relief or (y) remains
          undismissed, undischarged or unbonded.

     (vii)The WinStar  Parties  shall be  satisfied,  in their sole  discretion,
          that  the  consummation  of  the  transactions   contemplated  hereby,
          together with the acquisition of the shares to be purchased by WinLLC1
          pursuant  to the  Reorganization  Agreement,  will  not  constitute  a
          "Common Stock Event" pursuant to the Rights Plan of ARTT.

     (c) The  obligation of Seller to consummate  the transfer of the Shares and
Other Assets shall be subject to the  satisfaction  or waiver,  on or before the
Closing Date, of each of the following conditions:

     (i)  The representations and warranties of the WinStar Parties contained in
          this  Agreement  shall be true and  correct  on and as of the  Closing
          Date,  with the same  force and  effect  as if made as of the  Closing
          Date.




<PAGE>


         

     (ii) All the covenants  contained in this  Agreement to be complied with by
          the  WinStar  Parties  on or before the  Closing  Date shall have been
          complied with.

     (iii)Seller shall have  received a  certificate  of the WinStar  Parties to
          the effect set forth in Sections 6(c)(i) and (ii) hereof.

     (iv) The WinStar Parties shall have made the deliveries required by Section
          2(c) hereof and shall have executed and delivered to Seller the Escrow
          Agreement referred to in Section 7(c).

     (v)  None  of  the  WinStar   Parties  or  any  of  WinStar's   significant
          subsidiaries  (as determined  pursuant to Regulation  S-X  promulgated
          under the 1933 Act) shall have commenced any case, proceeding or other
          action (A)  relating  to  bankruptcy,  insolvency,  reorganization  or
          relief of debtors,  seeking to have an order for relief  entered  with
          respect to it, or seeking to adjudicate it a bankrupt or insolvent, or
          seeking   reorganization,    arrangement,   adjustment,   liquidation,
          dissolution,  composition  or other  relief with  respect to it or its
          debts, or (B) seeking appointment of a receiver, trustee, custodian or
          other similar  official for it or for all or any  substantial  part of
          its property,  or shall have made a general assignment for the benefit
          of its creditors,  and there shall not have been commenced against any
          of the WinStar  Parties or any of WinStar's  significant  subsidiaries
          any case, proceeding or other action of a nature referred to in clause
          (A) above or seeking  issuance of a warrant of attachment,  execution,
          distraint or similar process  against all or any  substantial  part of
          its  property,  which case,  proceeding or other action (x) results in
          the  entry  of  an  order  for  relief  or  (y)  remains  undismissed,
          undischarged or unbonded.

7. Indemnification and Reimbursement.

     (a) Seller shall  indemnify and hold harmless the WinStar  Parties from and
against,   and  shall  reimburse  the  WinStar  Parties  for,  any  Damages  (as
hereinafter defined) which may be sustained,  suffered or incurred by any of the




<PAGE>


WinStar  Parties,  whether as a result of third-party  claims or otherwise,  and
which arise from or in connection with or are  attributable to (i) the breach of
any of  representations,  warranties  or covenants  of Seller  contained in this
Agreement  and (ii) the  ownership of the Shares on or before the Closing  Date.
This  indemnity  shall  survive  the  Closing for a period of one year after the
Closing Date except that with respect to claims  arising as a result of a breach
or alleged breach of the  representations and warranties in Section 3(c) and the
covenants  contained  in  Sections  5(f)  and  5(g),  it shall  survive  without
limitation  as to time.  Any claim for  indemnity  asserted  within the relevant
period shall survive until resolved.

     (b) The WinStar  Parties,  jointly and severally,  shall indemnify and hold
harmless Seller from and against,  and shall  reimburse  Seller for, any Damages
which may be sustained,  suffered or incurred by Seller,  whether as a result of
third-party  claims or otherwise,  and which arise from or in connection with or
are attributable to (i) the breach of any of the representations, warranties and
covenants of the WinStar Parties contained in this Agreement, (ii) the ownership
of the Shares after the Closing Date,  and (iii) any of the following  occurring
within the eighteen month period after the Closing Date: (A) the  acquisition by
WinStar  (separately  or with one or more of its  affiliates  (as defined  under
Regulation D promulgated  under the 1933 Act)) of any voting  securities of ARTT
or  options,   warrants  or  securities   convertible  into  or  exercisable  or
exchangeable for voting securities of ARTT (other than the Shares and the shares
to be acquired by WinLLC1  pursuant to the  Reorganization  Agreement),  (B) the
making or  participation  in any  manner by  WinStar  in any  "solicitation"  or
"proxies"  (as  such  terms  are  used  in the  proxy  rules  of the  Commission
promulgated under the Exchange Act) to vote securities or ARTT or the seeking by
WinStar to advise or  influence  any person or entity with respect to the voting
of any voting securities of ARTT, (C) WinStar  otherwise seeking  representation
on the Board of  Directors  ("Board")  of ARTT or to  control or  influence  the
management,  Board or policies of ARTT, (D) an executive  officer or director of
WinStar  disclosing to any third party any  intention,  plan or  arrangement  to
effectuate  any  of  the  foregoing  or  (E)  WinStar  advising,   assisting  or
encouraging  any other  person in  connection  with the  foregoing,  other  than
Damages sustained, suffered or incurred by Seller as a result of (x) in the case
of the  foregoing  clause  (A),  a claim  (other  than by a  WinStar  Party or a
stockholder of WinStar) that the  consideration  paid by the WinStar Parties for
the Shares is  excessive  in relation to the  consideration  paid for such other
shares and (y) in the case of any of the  foregoing  clauses (A) through  (E), a
breach or alleged breach by Seller (or any affiliate  thereof) of any obligation
to ARTT  arising  from  activities  or  agreements  of Seller (or any  affiliate
thereof) prior to the Closing Date. This indemnity shall survive the Closing for
a  period of one year after the Closing Date except that, with respect to claims




<PAGE>



arising (A) as a result of a breach or alleged breach of the representations and
warranties in Sections  1(c),  4(f),  4(h) and 5(e),  it shall  survive  without
limitation as to time, and (B) under clause (iii) above,  it shall survive for a
period of 20 months after the Closing  Date.  Any claim for  indemnity  asserted
within the relevant period shall survive until resolved.

     (c) As security for the payment of amounts  which may be due to the WinStar
Parties  pursuant to the  obligations  of Seller in Section 7(a), on the Closing
Date Seller shall deliver to Hahn & Hessen LLP, as escrow  agent,  24,140 of the
WinStar Shares,  to be held and disposed of by such escrow agent pursuant to the
terms of the Escrow  Agreement,  substantially  in the form of Exhibit I annexed
hereto, to be entered into by Seller,  the WinStar Parties and such escrow agent
on the Closing Date.

     (d) As used herein, the term "Damages" means the dollar amount of any loss,
damage,  expense  or  liability,   including,  without  limitation,   reasonable
attorneys' fees and disbursements incurred by an indemnified party in any action
or  proceeding  between  the  indemnified  party and the  indemnifying  party or
between the  indemnified  party and a third party,  which is  determined to have
been sustained, suffered or incurred by a party and to have in arisen from or in
connection  with an event or state of facts which is subject to  indemnification
under  this  Agreement.  The  amount  of  Damages  shall be the  amount  finally
determined  by a court of competent  jurisdiction  (after the  exhausting of all
appeals) or the amount agreed to upon settlement in accordance with the terms of
this Agreement,  if a third-party claim, or by the parties, if a direct claim of
one party  against  another.  Notwithstanding  the  foregoing,  "Damages"  shall
include,  with respect to any claim for  indemnification  arising  under Section
7(b)(iii),  only such loss, damage,  expense and liability as, in the aggregate,
exceeds the amount of any payment made pursuant to Section 1(c).

     (e) A party required to make an  indemnification  payment  pursuant to this
Agreement  ("Indemnifying  Party")  shall have no liability to make such payment
unless the party entitled to receive such indemnification  payment ("Indemnified
Party")  gives notice to the  Indemnifying  Party  specifying  (i) the covenant,
representation or warranty  contained herein which it asserts has been breached,
(ii) in  reasonable  detail,  the  nature  and  dollar  amount  of any claim the
Indemnified  Party may have  against the  Indemnifying  Party by reason  thereof
under this  Agreement,  and (iii) whether the claim is a third-party  claim or a
direct claim of the Indemnified Party against the Indemnifying Party.




<PAGE>



     (f) If an Indemnified  Party becomes aware of a third-party claim for which
an Indemnifying  Party would be liable to an Indemnified  Party  hereunder,  the
Indemnified  Party  shall,  with  reasonable  promptness,  notify in writing the
Indemnifying  Party of such claim,  identifying the basis for such claim and the
amount or the estimated  amount  thereof to the extent then  determinable  which
estimate  shall not be  conclusive of the final amount of such claim (the "Claim
Notice"); provided, however, that any failure to give such Claim Notice will not
be deemed a waiver of any rights of the  Indemnified  Party except to the extent
the rights of the  Indemnifying  Party are actually  prejudiced by such failure.
The  Indemnifying  Party,  upon request of the Indemnified  Party,  shall retain
counsel  (who  shall be  reasonably  acceptable  to the  Indemnified  Party)  to
represent the  Indemnified  Party and shall pay the reasonable fees and expenses
of such counsel with regard  thereto;  provided,  however,  that any Indemnified
Party is  hereby  authorized,  prior to the  date on which it  receives  written
notice from the Indemnifying Party designation such counsel,  to retain counsel,
whose  reasonable fees and expenses shall be at the expense of the  Indemnifying
Party,  to file any motion,  answer or other pleading and take such other action
which it  reasonably  shall deem  necessary to protect its interests or those of
the  Indemnifying  Party until the date on which the Indemnified  Party receives
such notice  from the  Indemnified  Party.  After the  Indemnifying  Party shall
retain such counsel,  the  Indemnified  Party shall have the right to retain its
own counsel,  but the fees and expenses of such counsel  shall be at the expense
of such Indemnified party unless (i) the Indemnifying  Party and the Indemnified
Party shall have  mutually  agreed to the  retention of such counsel or (ii) the
named parties of any such proceeding  (including any impleaded parties) included
both the Indemnifying Party and the Indemnified Party and representation of both
parties by the same counsel  would be  inappropriate  due to actual or potential
differing  interests  between them. If requested by the Indemnifying  Party, the
Indemnified  Party  agrees  to  cooperate  with the  Indemnifying  Party and its
counsel in contesting any claim or demand which the Indemnifying  Party defends.
A claim or demand  may not be  settled by any party  without  the prior  written
consent of the other party  (which  consent will not be  unreasonably  withheld)
unless,  as part of such settlement,  the Indemnified Party shall receive a full
and unconditional  release reasonably  satisfactory to it.  Notwithstanding  the
foregoing,  the Indemnifying  Party may settle any third-party claim without the
prior written consent of the Indemnified  Party if such claim is exclusively for
monetary damages.

     (g) If  any  Indemnified  Party  shall  have a  direct  claim  against  any
Indemnifying  Party hereunder,  the Indemnified  Party shall send a Claim Notice
with respect to such claim to the Indemnifying Party.




<PAGE>



     (h) No  Indemnifying  Party shall be required to indemnify  an  Indemnified
Party  pursuant to this Section 7 unless the  aggregate of all amounts for which
indemnity would otherwise be due against it exceeds $50,000 and then only to the
extent such amounts exceed $50,000 and do not exceed $1,700,000.  The provisions
of this Section 7(h) shall not apply with respect to a claim for indemnification
based on a breach or alleged  breach of the covenants of Seller in Sections 5(f)
and 5(g).

8. Termination.

     (a) This  Agreement  may be  terminated at any time prior to the Closing as
follows:

     (i)  by mutual written consent of Seller and the WinStar Parties;

     (ii) by Seller, (A) if the WinStar Parties shall have failed to perform any
          of their covenants or agreements  contained in this  Agreement,  which
          failure,  if subject to cure,  has not been cured  within 10  business
          days  after  Seller  has given  notice to the  WinStar  Parties of his
          intention to terminate,  (B) if the  representations and warranties of
          the WinStar Parties  contained in this Agreement shall not be true and
          correct in all  respects at the time made and at the  Closing  Date or
          (C) if the  conditions to the  obligations of Seller to consummate the
          transactions contemplated by this Agreement shall not have occurred by
          August 31, 1998.

     (iii)by the  WinStar  Parties,  (A) if Seller  shall have failed to perform
          any of their covenants in this Agreement, which failure, if subject to
          cure,  has not been cured  within 10  business  days after the WinStar
          Parties have given notice to Seller of their  intention to  terminate,
          (B) if the  representations and warranties of Seller contained in this
          Agreement  shall not be true and  correct in all  respects at the time
          made  and on  the  Closing  Date  or  (C)  if  the  conditions  to the
          obligations  of the WinStar  Parties to  consummate  the  transactions
          contemplated  by this Agreement  shall not have occurred by August 31,
          1998.

     (b) In the event of termination by Seller or the WinStar Parties,  or both,
pursuant  hereto,  written notice thereof shall  forthwith be given to the other
party and all further  obligations  of the parties  under this  Agreement  shall
terminate,  no party shall have any right under this Agreement against any other
party  except as set forth in this  Section 8, and each party shall bear its own




<PAGE>



costs and expenses.  In such event:

     (i)  If  this  Agreement  is  terminated  by  Seller  pursuant  to  Section
          8(a)(ii)(A)  or (B) or by the  WinStar  Parties  pursuant  to  Section
          8(a)(iii)(A) or (B), the terminating party's right to pursue all legal
          and equitable remedies for breach of contract or otherwise, including,
          without  limitation,  Damages  relating  thereto,  shall  survive such
          termination unimpaired; and

     (ii) Nothing  herein  shall  preclude  any party,  upon a breach  hereof by
          another  party,  from  pursuing  all  equitable  remedies,   including
          specific performance,  it being acknowledged and agreed by the parties
          that the transactions contemplated hereby are of a special, unique and
          extraordinary  character  and that any breach  will cause  irreparable
          injury to the non-  breaching  party for which money  damages will not
          provide a wholly adequate remedy.

9. Miscellaneous.

     (a) Except as otherwise provided herein, all costs and expenses, including,
without  limitation,  fees and  disbursements  of  representatives,  incurred in
connection with this Agreement and the transactions contemplated hereby shall be
paid by the party incurring such costs and expenses.

     (b) All  notices and other  communications  given or made  pursuant  hereto
shall be in  writing  and shall be deemed to have been duly  given or made as of
the date delivered if delivered personally or by nationally recognized overnight
courier or by  telecopy to the parties at the  following  addresses  (or at such
other  address for a party as shall be  specified  by like  notice,  except that
notices of changes of address shall be effective upon receipt):

     If to Seller:

                                    James Pinto
                                    366 Round Hill Road
                                    Greenwich, Connecticut 06830
                                    Telecopier No.: 212-935-3851







<PAGE>



     If to the WinStar Parties:

                                    230 Park Avenue
                                    Suite 2700
                                    New York, New York  10169
                                    Attention:  Timothy R. Graham, Esq.
                                    Telecopier No.: (212) 922-1637

     with a copy to:

                                    Graubard Mollen & Miller
                                    600 Third Avenue
                                    New York, New York  10016
                                    Attention:  David Alan Miller, Esq.
                                    Telecopier No.: (212) 818-8881


     (c) Neither Seller nor the WinStar  Parties shall make any public  announce
ments in respect  of this  Agreement  or the  transactions  contemplated  herein
without the consent of the other, which consent shall not unreasonably  withheld
or  delayed,  except  that  any of the  WinStar  Parties  may  make  any  public
announcement  they  deem  necessary  to  comply  with  their  legal  obligations
(including  disclosure  by  means  of  filings  with the  Commission  and  other
governmental authorities),  and will use reasonable efforts to provide a copy of
such public announcement to Seller prior to the public dissemination thereof.

     (d) The WinStar Parties may assign its rights under this Agreement,  or any
portion  thereof,   to  any   wholly-owned   direct   subsidiary   (including  a
non-corporate  subsidiary) of WinStar or any successor to WinStar, provided that
such assignee shall assume in writing the rights and obligations so assigned and
such  assignment  shall not  relieve the  WinStar  Parties of their  obligations
hereunder to the extent not fulfilled by such assignee.  Seller shall not assign
any of his rights under this Agreement  without the prior written consent of the
WinStar Parties.

     (e) This  Agreement may not be amended or modified  except by an instrument
in writing  signed by Seller and the WinStar  Parties,  which  instrument  shall
thereupon be binding upon all the parties.

     (f) Any party may (i)  extend  the time for the  performance  of any of the
obligations or other acts of any other party, (ii) waive any inaccuracies in the





<PAGE>


representations  and warranties  contained  herein or in any document  delivered
pursuant  hereto  and  (iii)  waive  compliance  with any of the  agreements  or
conditions contained herein. Any such extension or waiver shall be valid only if
set forth in an instrument in writing signed by the party to be bound thereby.

     (g) If any provision of this Agreement is determined to be invalid, illegal
or  incapable  of being  enforced by a court or  regulatory  agency of competent
jurisdiction,  the other  provisions of this Agreement shall not be affected and
shall  remain in full force and effect and the parties  shall  negotiate in good
faith  revisions to this  Agreement  so as to effect the original  intent of the
parties pursuant to the provision so affected.

     (h)  This  Agreement,  together  with the  Schedules  and  Exhibits  hereto
(including the Escrow  Agreement  referred to in Section  7(c)),  constitute the
entire  agreement,  and supersede all prior  agreements and  undertakings,  both
written and oral,  among the parties,  with respect to the subject matter hereof
and thereof and, except as otherwise expressly provided herein, are not intended
to confer upon any other person any rights or remedies hereunder.

     (i) This  Agreement  shall inure to the benefit of and be binding  upon the
successors, distributees and assigns of the parties.

     (j) This Agreement shall be governed by, and construed in accordance  with,
the law of the State of New York,  without  regard to principles of conflicts of
law. EACH PARTY HEREBY  IRREVOCABLY  CONSENTS AND SUBMITS TO THE JURISDICTION OF
ANY NEW YORK STATE OR UNITED  STATES  FEDERAL  COURT SITTING IN THE STATE OF NEW
YORK,  COUNTY  OF NEW YORK  OVER ANY  ACTION  OR  PROCEEDING  ARISING  OUT OF OR
RELATING TO THIS  AGREEMENT AND  IRREVOCABLY  CONSENTS TO THE SERVICE OF ANY AND
ALL PROCESS IN ANY SUCH ACTION OR  PROCEEDING BY  REGISTERED  MAIL  ADDRESSED TO
SUCH PARTY AT ITS ADDRESS  SPECIFIED IN SECTION 8(b).  EACH PARTY FURTHER WAIVES
ANY  OBJECTION TO VENUE IN NEW YORK AND ANY OBJECTION TO AN ACTION OR PROCEEDING
IN SUCH STATE AND COUNTY ON THE BASIS OF FORUM NON  CONVENIENS.  EACH PARTY ALSO
WAIVES ANY RIGHT TO TRIAL BY JURY.

 




<PAGE>


     (k) This Agreement may be executed in one or more counterparts,  and by the
different parties in separate counterparts, each of which when executed shall be
deemed to be an original but all of which when taken together  shall  constitute
one and the same agreement.

     (l) No  provision  of this  Agreement  or any  other  instrument  or  other
document delivered in connection with the transactions  contemplated hereby will
be  interpreted  in favor of, or  against,  any of the  parties by reason of the
extent to which such party or its counsel participated in the drafting hereof or
by reason of the extent to which any such  provision  is  inconsistent  with any
prior draft hereof or thereof.

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

                              WINSTAR COMMUNICATIONS, INC.

                                   /s/ T. R. Graham
                              By________________________________________
                                 Name: T.R. Graham
                                 Title: Executive Vice President

                                       WINSTAR LHC1 LLC
                              By:      WINSTAR COMMUNICATIONS, INC., Member

                                   /s/ T. R. Graham
                               By:_______________________________________
                                  Name: T.R. Graham
                                  Title: Executive Vice President



                                   /s/ James Pinto
                                   _______________________________________
                                   JAMES PINTO


<PAGE>



                     AGREEMENT AND PLAN OF REORGANIZATION


     AGREEMENT  AND PLAN OF  REORGANIZATION  ("Agreement")  dated April 24, 1998
among WINSTAR COMMUNICATIONS,  INC., a Delaware corporation ("WinStar"), WINSTAR
LHC1 LLC, a New York  limited  liability  company  of which  WinStar is the sole
member  ("WinLLC1"),  WINSTAR LHC2 LLC, a New York limited  liability company of
which WinStar is the sole member  ("WinLLC2"  and,  together  with WinLLC1,  the
"LLCs"),  LANDOVER HOLDINGS  CORPORATION,  a Delaware  corporation  ("LHC"), and
LAURENCE S. ZIMMERMAN, residing at 210 El Vedado Road, Palm Beach, Florida 33480
("Zimmerman" and, together with LHC, the "LHC Parties").

     WHEREAS, Zimmerman is the owner of all of the outstanding shares of capital
stock of LHC;
and

     WHEREAS,  LHC is principally engaged in the business of investing in stocks
and other  securities and managing its  investments  and has been so principally
engaged since its organization in 1993 (the "Historic Business"); and

     WHEREAS, the LHC Parties wish to continue to invest in broad-band
wireless telephone assets through WinStar; and

     WHEREAS,  the LHC  Parties,  WinStar  and the LLCs wish for LHC to transfer
substantially  all of its assets to the LLCs  solely in  exchange  for shares of
voting  common  stock of  WinStar  in a  transaction  intended  to  qualify as a
"reorganization"  within the  meaning of Section  368(a)(1)(C)  of the  Internal
Revenue Code of 1986, as amended ("IRC"),  it being  contemplated by the parties
that LHC will  thereafter,  as an integral part of the  transaction,  distribute
such shares of WinStar common stock to Zimmerman in complete  liquidation of LHC
and dissolve; and

     WHEREAS,  WinStar has formed the LLCs to acquire  substantially  all of the
assets of LHC on the terms and  conditions  set forth herein for valid  business
purposes;

         IT IS AGREED:





<PAGE>



     1. Transfer of Assets; Consideration.

     (a)  Subject  to the  terms and  conditions  of this  Agreement,  LHC shall
transfer,  assign and convey to the LLCs,  as directed by WinStar,  and the LLCs
shall  acquire  from LHC,  on the Closing  Date (as  hereinafter  defined),  the
following assets of LHC:

     (i)  2,758,864  shares of the common stock,  par value $.001 per share,  of
          Advanced Radio Telecom Corp.  ("ARTT"),  a Delaware  corporation  (the
          "Shares"),  including the associated  preferred  stock purchase rights
          issued  pursuant to the Rights  Agreement  dated June 20, 1997 between
          ARTT and Continental  Stock Transfer & Trust Company (the "ARTT Rights
          Plan"), which shall be transferred,  conveyed and assigned to WinLLC1;
          and

     (ii) subject to the  provisions of Section 5(l), the other assets listed on
          Schedule A annexed hereto (the "Other Assets" and,  collectively  with
          the Shares,  the "Historic Business Assets" of LHC), as the same exist
          on the Closing Date, which shall be transferred, conveyed and assigned
          to WinLLC2.

     (b) The consideration payable to LHC for the Historic Business Assets shall
be 1,273,029  shares of the voting  common stock,  par value $.01 per share,  of
WinStar (the  "WinStar  Shares"),  plus the  "Adjustment  Shares" (as defined in
Section 1(c)), if any, which may be issued pursuant to Section 1(c). The WinStar
Shares and the Adjustment Shares shall be issued by WinStar to LHC.

     (c) If, within eighteen months after the Closing Date, WinStar, directly or
indirectly,  (i) acquires at least 80% of the outstanding shares of common stock
of ARTT,  or (ii)  acquires  all or  substantially  all of the assets of ARTT or
enters into a merger or other business  combination with ARTT the consequence of
which is that WinStar, directly or indirectly,  becomes the sole owner of all or
substantially  all of the assets of ARTT ( any event under  clauses (i) and (ii)
being an "ARTT Business  Combination") for an "average price per share" paid for
shares of common  stock of ARTT  greater  than $20.00 per share (the  "Benchmark
Price"), then WinStar shall issue to LHC (or to Zimmerman, as distributee of LHC
in  liquidation)  that number of shares of common stock of WinStar  ("Adjustment
Shares") equal to the difference  between such "average price per share" and the
Benchmark Price  multiplied by 2,758,864 and divided by the  "Adjustment  Price"





<PAGE>


(as  hereinafter  defined),  rounded to the nearest  whole share.  Such issuance
shall be made on the date (the  "Adjustment  Closing  Date")  which is the fifth
business  day  after the date on which  WinStar  consummates  the ARTT  Business
Combination.  As used herein,  "Adjustment  Price" shall mean the average of the
last sale prices of the common stock of WinStar  reported on the Nasdaq National
Market ("NNM") for the five consecutive trading days ending on the date on which
WinStar consummates the ARTT Business Combination.  For purposes of this Section
1(c), in determining the "average price per share" of any shares of common stock
of ARTT for which  payment is made with shares of common stock of WinStar,  such
common  stock of WinStar  shall be valued at the average of the last sale prices
of WinStar  common stock  reported on the NNM for the five  consecutive  trading
days ending on the date of such  purchase  by  WinStar.  In the event of an ARTT
Business  Combination  pursuant to the preceding clause (ii), the "average price
per share" shall be the value of the aggregate  consideration paid by WinStar to
ARTT or its stockholders in such ARTT Business Combination divided by the number
of  outstanding  shares  of  common  stock of ARTT,  with  any  portion  of such
consideration  which is paid for with  shares of common  stock of WinStar  being
valued at the average of the last sale prices of WinStar  common stock  reported
on the NNM for the  five  consecutive  trading  days  ending  on the date of the
consummation  of  such  ARTT  Business  Combination.   If  any  portion  of  the
consideration  paid by WinStar to ARTT or its stockholders is paid other than in
cash or with  shares  of common  stock of  WinStar,  for  purposes  hereof  such
consideration  shall be valued at its fair  market  value.  Notwithstanding  the
foregoing or anything else in this  Agreement,  WinStar shall have no obligation
to acquire any ARTT  securities and has made no  representation  that it has any
present or future  intent to acquire any ARTT  securities  other than the Shares
and the Additional ARTT Shares (as hereinafter defined).

     (d) The LLCs shall acquire  solely the Historic  Business  Assets and shall
assume solely the following  liabilities and obligations of the LHC Parties: (i)
the  obligations  of LHC pursuant to the  agreement  with JPW  Consulting,  Inc.
described  in Schedule A (the "JPW  Agreement"),  (ii) margin debt in certain of
the accounts listed in Schedule A as specified therein, not to exceed $1,000,000
in the  aggregate on the Closing  Date,  and (iii) solely at WinLLC1's  election
pursuant to Section 5(o), the obligations of LHC pursuant to the Second Restated
and  Amended  Registration  Rights  Agreement  dated July 3, 1996,  among  ARTT,
Advanced  Radio  Technologies   Corporation   ("ARTC"),   the  stockholders  and
warrantholders  of ARTT and the  stockholders  and  warrantholders  of ARTC (the
"Registration Rights Agreement") (collectively,  the "Assumed Liabilities"). All
of the  Assumed  Liabilities  shall be assumed  only by  WinLLC2  other than the





<PAGE>


Registration  Rights Agreement,  which shall, at WinLLC1's  election pursuant to
Section 5(o), be assumed by WinLLC1 .

     (e) All share and  share-related  amounts and figures  described  hereunder
shall be appropriately adjusted from time to time to account for and give effect
to any reclassifications,  stock splits, stock dividends, share combinations and
similar  changes  affecting the common stock of WinStar as a whole or the common
stock of ARTT as a whole and all holders thereof.

     2. Closing.

     (a) Subject to the terms and conditions of this Agreement, the consummation
of the transactions contemplated by this Agreement shall take place at a closing
(the  "Closing")  to be held at 10:00  a.m.,  New York City time,  at a mutually
agreeable  location  in New York  City,  on a date  ("Closing  Date") as soon as
practicable  following  the  expiration  or earlier  termination  of the waiting
period  under  the  Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  as
amended (the "HSR Act"),  and the satisfaction or waiver of the other conditions
to Closing set forth in Section 6 hereof.

     (b) At  the  Closing,  LHC  shall  deliver  to  (i)  WinLLC1,  certificates
representing  the  Shares,  duly  executed  in form for  transfer  by the record
holders  thereof  or with duly  executed  stock  powers  therefor,  not  bearing
restrictive  legends of any nature other than legends  referring to restrictions
imposed by Federal  and state  securities  laws and free and clear of any liens,
claims, charges,  restrictions,  security interests or other encumbrances of any
kind,  including,  without limitation,  encumbrances  created by option,  voting
rights,  buy-sell,  stockholder  or  other  agreements  of any  kind  whatsoever
affecting  the Shares  (collectively,  "Encumbrances")  other than  Encumbrances
resulting  from the  actions  or  omissions  of  WinStar  or the LLCs  ("WinStar
Encumbrances")  and those imposed by Federal and state  securities  laws and, if
assigned  to and assumed by  WinLLC1,  the  Registration  Rights  Agreement  (as
hereafter  defined),   (ii)  WinLLC2,  bills  of  sale,  assignments  and  other
appropriate  transfer  documents  in form  reasonably  satisfactory  to  WinLLC2
sufficient to convey to WinLLC2 good and  marketable  title to the Other Assets,
free and clear of all  Encumbrances  other than WinStar  Encumbrances and margin
debt as specified in Schedule A, not to exceed  $1,000,000  in the  aggregate on
the Closing Date,  and (iii) the LLCs and WinStar,  the  certificates  and other
documents required to be delivered by the LHC Parties pursuant hereto.





<PAGE>


     (c) At the  Closing,  WinStar  and the  LLCs  (collectively,  the  "WinStar
Parties")  shall deliver to LHC (i) a  certificate  for 1,134,029 of the WinStar
Shares, (ii) an assumption  agreement or other appropriate  assumption documents
with respect to the Assumed Liabilities, in form reasonably satisfactory to LHC,
executed by WinLLC2,  and (iii) the certificates and other documents required to
be delivered by the WinStar  Parties  pursuant  hereto and shall  deliver to the
escrow agent  referred to in the Escrow  Agreement  (as  hereinafter  defined) a
certificate  for the balance of the WinStar  Shares.  The  certificates  for the
WinStar Shares and any Adjustment Shares issued hereunder shall bear the legends
(the "Legends") set forth in Schedule B annexed hereto.

     3.  Representations  and  Warranties  of the LHC Parties.  The LHC Parties,
jointly and severally,  represent and warrant to the WinStar  Parties as follows
and acknowledge  that the WinStar Parties are relying upon such  representations
and warranties:

     (a) LHC (i) is a corporation  duly organized,  validly existing and in good
standing under the laws of the State of Delaware,  (ii) has all requisite  power
to own,  lease and operate its  properties  and to carry on its  business as now
being  conducted and (iii) has all  necessary  power and authority to enter into
this Agreement and to perform its obligations as contemplated hereby. All action
necessary  to  be  taken  by  LHC  to  authorize  the  execution,  delivery  and
performance of this Agreement and all other agreements and instruments delivered
and to be  delivered  by LHC in  connection  herewith  has been duly and validly
taken.  This Agreement  constitutes the valid and binding  obligation of each of
the LHC  Parties,  enforceable  in  accordance  with its  terms,  except  as the
enforceability thereof may be limited by any applicable  bankruptcy,  insolvency
or other laws affecting  creditors' rights generally or by general principles of
equity,  regardless of whether such enforceability is considered in equity or at
law and except  that  enforceability  of any  indemnification  provision  may be
limited under Federal and state securities laws.

     (b) The  execution,  delivery and  performance of this Agreement by the LHC
Parties  do not and will not (i)  violate  or  result in any  default  under any
provision of the Certificate of Incorporation or By-Laws of LHC, (ii) violate or
result in any default under or give rise to any right of termination, revocation
or  modification  of any indenture,  license or other agreement to which any LHC
Party is a party or to which the  Shares or Other  Assets  are  subject or (iii)
violate  or  result  in any  default  under any law,  regulation,  order,  writ,
judgment  or  decree  applicable  to such LHC  Party or the  Shares or the Other
Assets or by which the ability of the LHC Parties to consummate the transactions
to be consummated by them hereunder would be adversely affected as a consequence




<PAGE>



of such violation or default.

     (c)  (i) Subject to the  Registration  Rights  Agreement,  the Voting Trust
          Agreement  dated  November 5, 1996 among LHC,  Kimberly  Zimmerman and
          Zachary Tyler  Zimmerman Trust and Vernon L.  Fotheringham,  Andrew I.
          Fillat and Mark C. Demetree,  Trustees (the "Voting Trust Agreement"),
          the  Cooperation  Agreement dated November 5, 1996 by and between LHC,
          Zimmerman  and ARTT (the  "Cooperation  Agreement"),  the  instruction
          letters and  customer  agreements  listed on Schedule C  (collectively
          with the Registration Rights Agreement, the Voting Trust Agreement and
          the Cooperation Agreement,  the "Operative  Agreements"),  LHC has the
          sole,  entire and unfettered  right to transfer the Shares to WinLLC1,
          free  and  clear  of any  Encumbrance  whatsoever  and  subject  to no
          restrictions  with  respect  to  the  transferability   thereof.  Upon
          acquisition  of the Shares by WinLLC1,  WinLLC1  will be able to vote,
          transfer and otherwise dispose of the Shares without restriction under
          the Operative  Agreements,  except subject to the Registration  Rights
          Agreement, if assumed by WinLLC1.

     (ii) The LHC Parties are the sole  "beneficial  owners" (as defined in Rule
          13d-3  promulgated  under the  Securities and Exchange Act of 1934, as
          amended  (the  "Exchange  Act")) of the Shares,  free and clear of all
          Encumbrances  except as set forth in Schedule C annexed hereto, all of
          which  Encumbrances shall terminate and be null, void and of no effect
          on and after the Closing other than those imposed by the  Registration
          Rights  Agreement  (if assigned to and assumed by WinLLC1) and Federal
          and state securities laws. No person or entity has any option or other
          right to purchase the Shares or  otherwise  obtain any interest in the
          Shares  from any of the LHC  Parties.  The sale  and  transfer  of the
          Shares to WinLLC1  pursuant to this Agreement will not give any person
          or entity a legal  right or cause of action  against the Shares or any
          of the WinStar Parties except as may result from a breach by a WinStar
          Party of an obligation to which it is subject.  Upon  consummation  of
          the  transactions  contemplated  hereby,  WinLLC1 will hold the Shares
          free and clear of any  Encumbrance,  including any rights of any other
          person or entity whatsoever,  other than WinStar  Encumbrances,  those
          imposed by Federal and state  securities  laws and, if assigned to and
          assumed by WinLLC1, the Registration Rights Agreement.

                                    




<PAGE>

     (iii)The Shares are validly issued,  fully paid and non-assessable and were
          issued in compliance with all Federal and state securities laws.

     (iv) The Shares  constitute  the only  shares of  capital  stock of ARTT of
          which  LHC or  Zimmerman  or any of their  respective  Affiliates  (as
          defined in the ARTT Rights Plan) is the  Beneficial  Owner (as defined
          in the ARTT Rights Plan) other than an  aggregate of 74,728  shares of
          common stock of ARTT (the "Excluded Shares"). For purposes of Rule 144
          ("Rule 144")  promulgated under the Securities Act of 1933, as amended
          (the "1933  Act"),  none of the Shares was  acquired by LHC later than
          October 28, 1996,  and none of the LHC Parties is an  "affiliate"  (as
          defined  in Rule 144) of ARTT or has been such an  "affiliate"  for at
          least three months prior to the date hereof.

     (d) LHC is not in violation of any term of its Certificate of Incorporation
or  By-Laws  or  any  mortgage,  indenture,  contract,  agreement,   instrument,
judgment,  decree,  order,  statute, rule or regulation or writ or decree of any
court,  governmental  agency  or  instrumentality  to  which  it is  subject,  a
violation  of which  would  have a  material  adverse  effect on its  ability to
perform its obligations under this Agreement.

     (e) The execution and delivery of this Agreement by the LHC Parties do not,
and the performance of this Agreement and the  consummation of the  transactions
contemplated hereby by the LHC Parties will not, require any consent,  approval,
authorization  or other  action  by,  or filing  with or  notification  to,  any
governmental or regulatory  authority or other third party other than (i) notice
required to be given to the  Trustees  pursuant to the Voting  Trust  Agreement,
(ii) notice to ARTT pursuant to the  Registration  Rights  Agreement and, if the
Registration  Rights  Agreement  is  assigned  to  and  assumed  by  WinLLC1,  a
counterpart  of such  agreement  signed by WinLLC1  required to be given to ARTT
pursuant to such  agreement,  and (iii) notice to and actions by brokerage firms
to transfer the Historic  Business  Assets and  effectuate the assumption of the
Assumed Liabilities.

     (f) None of the LHC Parties knows of any facts or circumstances which could
reasonably  be expected  to have a material  adverse  effect upon the  business,
condition  (financial  or  otherwise)  or  prospects of ARTT which have not been
publicly  disclosed.  Zimmerman  is  not  in  possession  of  any  "confidential
information" which would subject him to the Insider Trading Policy and Procedure
of ARTT  adopted on May 31, 1996 and  prohibit the transfer of the Shares to the
LLCs by virtue of such policy.




<PAGE>




     (g) No  representation  or warranty by the LHC  Parties  contained  in this
Agreement  or other  instrument  furnished  or to be  furnished  to the  WinStar
Parties  pursuant  to this  Agreement  or in  connection  with the  transactions
contemplated hereby contains any untrue statement of a material fact or omits to
state a material fact necessary in order to make the statements contained herein
or  therein,  in light of the  circumstances  under  which they were  made,  not
misleading.

     (h) Except as otherwise set forth in this Agreement, the WinStar Shares and
Adjustment Shares will be acquired for LHC's account and not with a view towards
distribution  thereof.  The LHC  Parties  understand  that  they  must  bear the
economic risk of an investment in the WinStar Shares and the Adjustment  Shares,
which  cannot be sold by a LHC Party unless they are  registered  under the 1933
Act or an  exemption  therefrom  is  available.  Each of the LHC  Parties  is an
"Accredited Investor" as defined in Regulation D promulgated under the 1933 Act.
The LHC  Parties  have had both the  opportunity  to ask  questions  and receive
answers from the officers and  directors of the WinStar  Parties and all persons
acting on their behalf  concerning  the business and  operations  of the WinStar
Parties  and to obtain any  additional  information,  to the extent the  WinStar
Parties  possess  or may  possess  such  information  or can  acquire it without
unreasonable  effort or  expense,  necessary  to  verify  the  accuracy  of such
information.  The LHC Parties  acknowledge  receiving from WinStar and reviewing
Star's  Annual  Report on Form 10-K for the fiscal year ended  December 31, 1997
("10-K"),  Star's Proxy Statement for its Annual Meeting of Stockholders held on
June 26, 1997 ("Proxy Statement"), Star's Current Reports on Form 8-K filed with
the Securities  and Exchange  Commission  ("Commission")  since January 1, 1998,
which are listed on Schedule D annexed hereto (the "8-Ks" and, together with the
l0-K and the Proxy Statement, the "WinStar SEC Filings") and Star's Confidential
Offering Circulars dated March 13, 1998 and March 17, 1998.

     (i) No LHC Party is a member of a "group"  (within the meaning of Rule 13d-
5 under the Exchange Act) with respect to the  securities of ARTT with any other
person or entity other than as set forth in a statement  on Schedule  13-G dated
May 22, 1997 filed by LHC and certain other persons.

 




<PAGE>


     (j) LHC is the owner of, and has good and  marketable  title to, all of the
Other Assets, free and clear of all Encumbrances except as set forth in Schedule
A annexed  hereto,  all of which  Encumbrances,  other  than liens to secure the
payment of not more than $1,000,000 of margin debt, shall terminate and be null,
void and of no effect on and after the Closing.

     (k) None of the WinStar  Parties is an "LHC  Affiliate"  (as defined in the
Voting Trust  Agreement) or is  "affiliated"  (as defined in Section 2(b) of the
Voting Trust Agreement) with an LHC Affiliate.

     (l) The LHC Parties have delivered to the WinStar Parties true and complete
copies of each of the Operative Agreements and the JPW Agreement,  which are the
only  agreements  relating  to the  Historic  Business  Assets or the  ownership
thereof.

     (m) The representations and warranties of the LHC Parties set forth in this
Agreement  shall  survive  until one year from the Closing  Date except that the
representations and warranties set forth in Sections 3(c) and 3(j) shall survive
without limitation as to time.

     4.  Representations  and  Warranties  of the WinStar  Parties.  The WinStar
Parties  jointly  and  severally  represent  and  warrant  as follows to the LHC
Parties  and   acknowledge   that  the  LHC   Parties  are  relying   upon  such
representations and warranties:

          (a)  (i) WinStar (A) is a corporation duly organized, validly existing
               and in good standing under the laws of the State of Delaware, (B)
               has  all the  requisite  power  to own,  lease  and  operate  its
               properties  and to carry on its  business as now being  conducted
               and (C) has all necessary  power and authority to enter into this
               Agreement and to perform its obligations as contemplated hereby.

          (ii) Each  of  the  LLCs  (A)  is a  limited  liability  company  duly
               organized,  validly  existing and in good standing under the laws
               of the State of New York, (B) has all the requisite power to own,
               lease and operate its  properties and to carry on its business as
               now being conducted, (C) has all necessary power and authority to
               enter into this  Agreement  and to  perform  its  obligations  as
               contemplated  hereby and (D) shall be  treated  for  Federal  tax
               purposes as a "disregarded entity" within the meaning of Treasury
               Regulation  ss.301.7701-3(b)(1)(i)  as  in  effect  on  the  date
               hereof.



<PAGE>


         

          (iii)All  action  necessary  to be taken  by the  WinStar  Parties  to
               authorize  the  execution,   delivery  and  performance  of  this
               Agreement and all other agreements and instruments  delivered and
               to be delivered by the WinStar Parties in connection herewith has
               been duly and validly taken. This Agreement constitutes the valid
               and  binding   obligation   of  each  of  the  WinStar   Parties,
               enforceable  in  accordance   with  its  terms,   except  as  the
               enforceability   thereof   may  be  limited  by  any   applicable
               bankruptcy,  insolvency or other laws affecting creditors' rights
               generally  or by  general  principles  of equity,  regardless  of
               whether such  enforceability  is  considered in equity or at law,
               and except that enforceability of any  indemnification  provision
               may be limited under Federal and state securities laws.

     (b) The  execution,  delivery  and  performance  of this  Agreement  by the
WinStar  Parties do not and will not (i) violate or result in any default  under
any  provision  of  their  respective   Articles  of   Organization,   Operating
Agreements,  Certificates of Incorporation or By-Laws, (ii) violate or result in
any  default  under or give  rise to any  right of  termination,  revocation  or
modification  of any indenture,  license or other  agreement to which any of the
WinStar  Parties is a party or (iii)  violate or result in any default under any
law,  regulation,  order,  writ,  judgment  or decree  applicable  to any of the
WinStar  Parties  or by which  the  ability  of any of the  WinStar  Parties  to
consummate  the  transactions  to be  consummated  by them  hereunder  would  be
adversely affected as a consequence of such violation or default.

     (c) The execution and delivery of this Agreement by the WinStar  Parties do
not,  and  the  performance  of  this  Agreement  and  the  consummation  of the
transactions  contemplated  hereby by the WinStar Parties will not,  require any
consent,  approval,  authorization  or  other  action  by,  or  filing  with  or
notification to, any  governmental or regulatory  authority or other third party
other than the filing of a pre-merger notification  ("Notification") pursuant to
the HSR Act.

     (d)  None  of the  WinStar  Parties  is in  violation  of any  term  of its
respective  Articles  of  Organization,   Operating  Agreement,  Certificate  of
Incorporation or By-Laws or the provisions of any mortgage, indenture, contract,
agreement,  instrument,  judgment, decree, order, statute, rule or regulation or
writ or decree of any court,  governmental agency or instrumentality to which it





<PAGE>


is subject,  a violation  of which would have a material  adverse  effect on its
ability to perform its obligations under this Agreement.

     (e) The Shares will be acquired by WinLLC1 for its own account and not with
a view towards distribution thereof.

     (f) The WinStar Shares and the Adjustment  Shares are duly  authorized and,
upon issuance to LHC in  accordance  with the terms of this  Agreement,  will be
validly  issued,  fully  paid and  non-assessable  and,  based  solely  upon the
representations  and warranties of the LHC Parties contained  herein,  issued in
compliance with all Federal and state  securities laws and free and clear of all
Encumbrances other than those imposed as set forth in the Legends.

     (g) Each of the WinStar SEC Filings,  including  the  financial  statements
contained therein,  as of their filing dates,  complied in all material respects
with the requirements of the rules and regulations promulgated by the Commission
with respect thereto and did not contain any untrue statement of a material fact
or omit to state a material fact  required to be stated  therein or necessary in
order to make the statements  therein, in light of the circumstances under which
they were made,  not  misleading.  Since the date of filing of the most recently
filed of the WinStar SEC Filings,  there has been no material  adverse change in
the  business or  financial  condition  of WinStar  which has not been  publicly
disclosed.

     (h)  (i)  None  of the  WinStar  Parties  has  any  plan  or  intention  to
          reacquire,  directly or  indirectly,  any WinStar Shares or Adjustment
          Shares.

     (ii) None of the  WinStar  Parties  has any  plan or  intention  to sell or
          otherwise dispose of any significant  portion of the Historic Business
          Assets except for dispositions made in the ordinary course of business
          or transfers described in IRC ss.368(a)(2)(C).

     (iii)Following the  consummation of the  transactions  contemplated by this
          Agreement,  the WinStar  Parties plan and intend to use a  significant
          portion of the Historic Business Assets in a business.





<PAGE>



     (iv) None of the WinStar Parties is an investment company as defined in IRC
          ss.368(a)(2)(F)(iii) and (iv).

     (v)  None of the  WinStar  Parties  owns,  nor have they  owned in the five
          years  preceding the date of this  Agreement,  directly or indirectly,
          any capital stock of LHC.

     (vi) WinStar has no plan or intention  to sell or otherwise  dispose of its
          membership interest in either of the LLCs (or any portions thereof).

     (i)  None of the WinStar  Parties is an "LHC  Affiliate" (as defined in the
          Voting Trust Agreement) or is "affiliated" (as defined in Section 2(b)
          of the Voting Trust Agreement) with an LHC Affiliate.

     (j) The  representations and warranties of the WinStar Parties set forth in
this  Agreement  shall  survive until one year from the Closing Date except that
the  representations  and warran ties set forth in Sections  4(f) and 4(h) shall
survive without limitation as to time.

     5. Additional Agreements.

     (a) As soon as practicable after execution of this Agreement, WinStar shall
file a  Notification  with the  Federal  Trade  Commission  ("FTC") and the U.S.
Department  of Justice  ("DOJ")  pursuant  to and as required by the HSR Act and
shall notify ARTT of such filing.  WinStar shall use its reasonable best efforts
to have the waiting period under the HSR Act terminated as early as practicable.
Promptly upon receipt by any LHC Party or WinStar of any correspondence from the
FTC or DOJ in connection therewith,  such recipient shall give copies thereof to
the other party.

     (b) From the date  hereof  until the  earlier  of the  Closing  Date or the
termination of this Agreement in accordance with the provisions  hereof,  no LHC
Party shall sell, assign, or otherwise dispose of or place or allow to be placed
any  Encumbrance  upon any of the Shares or, except as provided in Section 5(l),
the Other Assets or any interest  therein,  except to the LLCs  pursuant to this
Agreement.





<PAGE>



     (c) The LHC Parties  shall pay all  documentary  transfer,  sales and other
taxes arising out of the sale and transfer of the Shares and the Other Assets to
the LLCs.

     (d)  From  the  date  hereof  through  the  Closing  Date  or  the  earlier
termination of this Agreement, the LHC Parties, on the one hand, and the WinStar
Parties, on the other hand (each a "Representing  Party"),  shall give the other
prompt written  notice of any event or  development  that occurs that (i) had it
existed  or been  known  on the date  hereof  would  have  been  required  to be
disclosed by the Representing  Party under this Agreement,  (ii) would cause any
of the representations and warranties of the Representing Party contained herein
to be inaccurate,  incomplete or otherwise  misleading in any material  respect,
(iii) would cause the Representing  Party to conclude that any of the conditions
to Closing set forth in Section 6 hereof  cannot be  satisfied,  or (iv) is of a
nature that would or could  reasonably  be  considered  to adversely  affect the
ability of the Representing Party to consummate the transactions contemplated by
this Agreement.

     (e)  Each   party   will  use  all   reasonable   efforts   to  obtain  all
authorizations,  consents,  orders and approvals of all Federal, state and other
regulatory  bodies  and  officials  that  may be or  become  necessary  for  the
performance  of its  obligations  pursuant to this  Agreement and will cooperate
fully   with  the  other   party  in   promptly   seeking  to  obtain  all  such
authorizations,  consents,  orders and approvals,  including expiration or early
termination of the waiting period under the HSR Act.

     (f) Subject to the terms and conditions of this Agreement, each party shall
cooperate with the other and shall use all reasonable  efforts to take, or cause
to be taken,  all actions and to do, or cause to be done, all things  necessary,
proper  or  advisable  to  consummate  the  transactions   contemplated  hereby,
including the execution and delivery of any additional  instruments necessary to
consummate  the  transactions  contemplated  hereby.  Each of the parties  shall
execute such documents and other papers and take such further  actions as may be
reasonably required or desirable to carry out the provisions hereof. Each of the
parties shall use its best efforts to cause the conditions to Closing  specified
in Section 6 which are within its control to be fulfilled.

     (g) Within 60 days after the Closing Date, WinStar will file a registration
statement to register all of the WinStar Shares under the 1933 Act to enable LHC
and Zimmerman,  as distributee of LHC in  liquidation,  to make a public sale of





<PAGE>


the WinStar Shares (including  without limitation those WinStar Shares deposited
in escrow pursuant to the Escrow  Agreement).  If Adjustment  Shares are issued,
within  60 days  after  the date of such  issuance,  WinStar  shall use its best
efforts to file a  registration  statement  to  register  all of the  Adjustment
Shares under the 1933 Act to enable LHC and Zimmerman,  as distributee of LHC in
liquidation,  to make a public sale of the Adjustment  Shares.  WinStar will use
its reasonable  best efforts to cause such  registration  statement(s) to become
effective  as  promptly as  reasonably  practicable  after  filing and to remain
effective  until such time as the WinStar Shares and the Adjustment  Shares,  as
the case may be, may be sold publicly without  registration  under the 1933 Act.
It shall be a condition to any such registration that the LHC Parties provide to
WinStar all  information  and documents  with respect to their  ownership of the
WinStar Shares and Adjustment  Shares,  compliance  with law, manner of proposed
disposition  and such other  matters as WinStar  shall  reasonably  request  for
disclosure  in the  registration  statement.  WinStar and the LHC Parties  shall
indemnify  one  another in the manner and to the  extent  that is  customary  in
connection with such registrations.  WinStar shall pay all expenses attendant to
the  preparation and filing of such  registration  statement other than the fees
and  expenses  of counsel  and  accountants  of the LHC  Parties  and  brokerage
discounts and commissions.

     (h) From the date hereof  until two years from  either the Closing  Date or
earlier  termination of this  Agreement  pursuant to the provisions of Section 7
hereof,  except  pursuant  to  this  Agreement,  no LHC  Party  or any of  their
respective  Affiliates (other than the Trustees under the Voting Trust Agreement
acting in  capacities  other than as such  Trustees)  or any group  (within  the
meanings of Rule 13d-5 under the Exchange Act and the Voting Trust Agreement) of
which any LHC Party is or becomes a member will, directly or indirectly,  either
alone or in concert with others in any manner acquire,  agree to acquire or make
any proposal to acquire,  for its own  account,  by purchase or  otherwise,  any
voting  securities,   options,   warrants  or  securities  convertible  into  or
exercisable or exchangeable for voting securities of ARTT.

     (i) From the date hereof  until two years from  either the Closing  Date or
the earlier  termination of this Agreement pursuant to the provisions of Section
7  hereof,  no  LHC  Party  shall,  in  any  manner,   directly  or  indirectly,
individually  or in concert with others,  (i) make or in any way  participate in
any  "solicitation"  of  "proxies"  to vote (as such terms are used in the proxy
rules of the Commission promulgated under the Exchange Act) or seek to advise or
influence  any  person or  entity  with  respect  to the  voting  of any  voting
securities  of  WinStar, (ii)  otherwise  seek  representation  on  the Board of




<PAGE>



Directors ("Board") or to control or influence the management, Board or policies
of WinStar, (iii) disclose to any third party any intention, plan or arrangement
inconsistent  with the  foregoing or (iv) advise,  assist or encourage any other
person in connection with the foregoing.

     (j) Each party shall be solely  responsible  for the payment of the fees of
all brokers,  finders,  investment  bankers and similar parties engaged by it in
connection with the transactions contemplated by this Agreement.

     (k)  Promptly  after the Closing,  LHC will  dissolve  and  liquidate  and,
subject to the provisions of the Escrow Agreement, distribute the WinStar Shares
and any Adjustment Shares that may be issued after the Closing Date to Zimmerman
as its sole stockholder.

     (l) During the period  from the date hereof to the  Closing  Date,  LHC may
continue  to  invest  in  and  trade   securities   through  the  accounts  (the
"Transferred  Accounts")  listed in paragraph I.B on Schedule A annexed  hereto,
subject to the following conditions that must be satisfied on the Closing Date:

     (i)  The  securities  held in the  Transferred  Accounts  must  (A)  have a
          readily  ascertainable market value, (B) be issued by companies with a
          market capitalization of at least $3 billion, (C) be traded on the New
          York Stock  Exchange  or the  American  Stock  Exchange  or listed for
          quotation  on the NNM and (D) be  eligible  as  collateral  for margin
          loans  within  the  policies  of the  brokerage  firms  in  which  the
          Transferred Accounts are established. No more than 20% of the value of
          the securities in the  Transferred  Accounts on the Closing Date shall
          be in the  securities  of any  single  issuer.  No  securities  in the
          Transferred  Accounts  on the  Closing  Date  shall be  securities  of
          issuers   engaged   principally   in   telecommunications   businesses
          (including  the  manufacture  or  distribution  of equipment  used for
          telecommunications services).

     (ii) The  aggregate  market  value  of the  securities  in the  Transferred
          Accounts,  measured as of the close of business  on the  business  day
          prior to the Closing  Date and based on the last sale price or closing
          price, as applicable,  net of the aggregate margin debt secured by the
          securities  in  the  Transferred  Accounts,  shall  be not  less  than
          $1,000,000  and such  aggregate  margin debt shall be not greater than
          $1,000,000.




<PAGE>



     (iii)No  securities  of  WinStar  or any  derivative  securities  based  on
          WinStar securities may be held in a Transferred Account on the Closing
          Date.

     (m) WinStar shall report the  acquisition of the Historic  Business and the
Historic  Business  Assets on its  Federal  corporation  income  tax return as a
reorganization  under IRC  ss.368(a)(1)(C)  and, if a similar  report of the LHC
Parties is timely furnished to WinStar,  in a manner  consistent  therewith,  in
accordance  with  Treasury  Regulation  ss.l.368-3(a)  as in  effect on the date
hereof and shall  provide  Zimmerman,  within  thirty (30) days of the filing of
WinStar's  Federal  corporation  income tax return on which such  information is
disclosed to the Internal Revenue Service,  a copy of the statement  attached to
such return.

     (n) WinLLC2  shall take no action which would  impair the  existence of the
Transferred  Accounts.  For purposes  hereof,  any action not taken by or at the
direction of a WinStar Party shall not be deemed taken by a WinStar Party.

     (o) At WinLLC1's election, given to LHC at least two business days prior to
the  Closing  Date,  LHC shall  assign  its  rights  and  obligations  under the
Registration Rights Agreement to WinLLC1 and WinLLC1,  pursuant to Section 15 of
the  Registration  Rights  Agreement,   shall  exercise  a  counterpart  to  the
Registration  Rights  Agreement  agreeing to be treated  thereunder  in the same
manner as LHC.

     (p) Concurrently with the execution of this Agreement, counsel to LHC shall
deliver to ARTT an opinion of counsel,  addressed  to ARTT,  stating that in the
opinion of such  counsel the transfer of the Shares  pursuant to this  Agreement
does not involve a transaction  requiring  registration or  qualification of the
Shares under the 1933 Act. LHC hereby  represents that the requirement set forth
in the first two sentences of Section 12(c) of the Registration Rights Agreement
that ARTT be given  prior  written  notice  of a  holder's  intention  to make a
"Transfer"  of   "Restricted   Shares"  (as  those  terms  are  defined  in  the
Registration  Rights Agreement) shall be satisfied by the delivery of an opinion
of counsel concurrently with the Transfer.

     (q) During the period  between the date of this  Agreement  and the Closing
Date,  neither  WinStar nor any of its Affiliates (as defined in the ARTT Rights




<PAGE>


Plan)  shall  acquire or agree to acquire  securities  of ARTT in an amount such
that any such acquisition would constitute a "Common Stock Event" under the ARTT
Rights Plan. For purposes of this covenant,  (i) no action  contemplated by this
Agreement  shall be deemed to constitute a "Common Stock Event" and (ii) WinStar
and such Affiliates may rely upon the  assumptions  that, as of the date of this
Agreement, there are outstanding not less than 22,877,503 shares of common stock
of ARTT,  including  warrants  which,  for purposes of the ARTT Rights Plan, are
considered to be outstanding shares of common stock of ARTT.

     (r) WinLLC1  will not sell or  otherwise  transfer or dispose of the Shares
except pursuant to an effective  registration statement pursuant to the 1933 Act
or an exemption from the registration requirements thereof.

     6. Conditions to Closing.

     (a) The respective  obligations of the LHC Parties and the WinStar  Parties
to consummate  the transfer and  acquisition  of the Shares and the Other Assets
shall be  subject  to the  fulfillment  at or prior to the  Closing  Date of the
following conditions:

     (i)  There shall not be in effect any order,  decree or injunction (whether
          preliminary,  final or appealable) of a United States Federal or state
          court of competent jurisdiction, no rule or regulation shall have been
          enacted or adopted by any  governmental  authority  or agency,  and no
          action or  proceeding  shall be pending or threatened by any person or
          entity other than a party hereto that  prohibits  consummation  of the
          transfer and acquisition of the Shares and the Other Assets, or any of
          them, to the LLCs.

     (ii) All  governmental  approvals  required  for  the  consummation  of the
          transfer and acquisition of the Shares and the Other Assets, including
          but not limited to  termination  or expiration  of the waiting  period
          under the HSR Act, shall have been granted.

     (b) The obligation of the WinStar  Parties to consummate the acquisition of
the Shares and the Other Assets shall be subject to the  satisfaction or waiver,
on or before the Closing Date, of each of the following conditions:





<PAGE>



     (i)  The  representations  and  warranties of the LHC Parties  contained in
          this  Agreement  shall be true and  correct  on and as of the  Closing
          Date,  with the same  force and  effect  as if made as of the  Closing
          Date.

     (ii) All the covenants  contained in this  Agreement to be complied with by
          LHC  Parties on or before the  Closing  Date shall have been  complied
          with.

     (iii)The WinStar Parties shall have received a certificate  executed by the
          President  of LHC and  Zimmerman  to the effect set forth in  Sections
          6(b)(i) and (ii).

     (iv) The WinStar  Parties  shall have received the opinion of Hahn & Hessen
          LLP,  counsel to the LHC  Parties,  substantially  in the form annexed
          hereto as Exhibit I.

     (v)  The LHC  Parties  shall have made the  deliveries  required by Section
          2(b)  hereof and shall have  executed  and  delivered  to the  WinStar
          Parties an Escrow  Agreement  substantially  in the form of Exhibit II
          annexed hereto (the "Escrow Agreement").

     (vi) Neither  any LHC  Party  nor  ARTT  shall  have  commenced  any  case,
          proceeding  or other  action (A) relating to  bankruptcy,  insolvency,
          reorganization  or relief  of  debtors,  seeking  to have an order for
          relief  entered  with  respect to it, or seeking  to  adjudicate  it a
          bankrupt  or  insolvent,  or  seeking   reorganization,   arrangement,
          adjustment, liquidation, dissolution, composition or other relief with
          respect to it or its debts, or (B) seeking  appointment of a receiver,
          trustee,  custodian or other similar official for it or for all or any
          substantial  part  of its  property,  or  shall  have  made a  general
          assignment for the benefit of its creditors,  and there shall not have
          been commenced  against any LHC Party or ARTT any case,  proceeding or
          other  action of a nature  referred  to in clause (A) above or seeking
          issuance of a warrant of attachment,  execution,  distraint or similar
          process  against all or any  substantial  part of its property,  which
          case,  proceeding or other action (x) results in the entry of an order
          for relief or (y) remains undismissed, undischarged or unbonded.

     (vii)The WinStar  Parties  shall be  satisfied,  in their sole  discretion,
          that  the  consummation  of  the  transactions   contemplated  hereby,
          



<PAGE>


          together with the acquisition of not more than 555,000 other shares of
          common  stock  of  ARTT  (the   "Additional  ARTT  Shares")  will  not
          constitute a "Common Stock Event" pursuant to the Rights Plan of ARTT.

     (viii) The  Excluded  Shares  shall  have been sold to a person  who is not
          "affiliated" (as defined in the Voting Trust Agreement) with LHC.

     (c) The  obligation  of the LHC Parties to  consummate  the transfer of the
Shares and Other Assets shall be subject to the  satisfaction  or waiver,  on or
before the Closing Date, of each of the following conditions:

     (i)  The representations and warranties of the WinStar Parties contained in
          this  Agreement  shall be true and  correct  on and as of the  Closing
          Date,  with the same  force and  effect  as if made as of the  Closing
          Date.

     (ii) All the covenants  contained in this  Agreement to be complied with by
          the  WinStar  Parties  on or before the  Closing  Date shall have been
          complied with.

     (iii)The LHC  Parties  shall have  received a  certificate  of the  WinStar
          Parties to the effect set forth in Sections 6(c)(i) and (ii) hereof.

     (iv) The WinStar Parties shall have made the deliveries required by Section
          2(c) hereof and shall have executed and delivered the Escrow Agreement
          to the LHC Parties.

     (v)  The LHC Parties shall have  received the opinion of Graubard  Mollen &
          Miller,  counsel to the  WinStar  Parties,  to the effect set forth in
          Sections  4(a),  (b)(i),  (b)(ii)  (to the best of  their  knowledge),
          (b)(iii) (to the best of their  knowledge),  (c) (to the best of their
          knowledge  with respect to third  parties),  (d) (to the best of their
          knowledge except as to Articles of Organization,  Operating Agreement,
          Certificate of Incorporation and By-Laws) and (f).

     (vi) None of the WinStar Parties or any of Star's significant  subsidiaries
          (as determined  pursuant to Regulation S-X promulgated  under the 1933
          




<PAGE>



          Act) shall have  commenced  any case,  proceeding  or other action (A)
          relating  to  bankruptcy,  insolvency,  reorganization  or  relief  of
          debtors,  seeking to have an order for relief  entered with respect to
          it, or seeking to adjudicate  it a bankrupt or  insolvent,  or seeking
          reorganization,  arrangement,  adjustment,  liquidation,  dissolution,
          composition  or other relief with  respect to it or its debts,  or (B)
          seeking appointment of a receiver, trustee, custodian or other similar
          official for it or for all or any substantial part of its property, or
          shall have made a general assignment for the benefit of its creditors,
          and there  shall not have been  commenced  against  any of the WinStar
          Parties or any of Star's significant subsidiaries any case, proceeding
          or other action of a nature referred to in clause (A) above or seeking
          issuance of a warrant of attachment,  execution,  distraint or similar
          process  against all or any  substantial  part of its property,  which
          case,  proceeding or other action (x) results in the entry of an order
          for relief or (y) remains undismissed, undischarged or unbonded.

     7. Termination.

     (a) This  Agreement  may be  terminated at any time prior to the Closing as
follows:  

     (i)  by mutual written consent of the LHC Parties and the WinStar Parties;

     (ii) by the LHC Parties,  (A) if the WinStar  Parties  shall have failed to
          perform  any of  their  covenants  or  agreements  contained  in  this
          Agreement,  which  failure,  if  subject  to cure,  has not been cured
          within 10  business  days  after LHC has given  notice to the  WinStar
          Parties of its intention to terminate,  (B) if the representations and
          warranties of the WinStar  Parties  contained in this Agreement  shall
          not be true and  correct in all  respects  at the time made and at the
          Closing Date or (C) if the  conditions to the  obligations  of the LHC
          Parties to consummate the transactions  contemplated by this Agreement
          shall not have  occurred by June 30, 1998,  except that if by June 30,
          1998, all of such conditions have occurred other than approval of such
          transactions  by the FTC and  the  DOJ,  such  approval  has not  been
          obtained by August 31, 1998.






<PAGE>


     (iii)by the WinStar  Parties,  (A) if the LHC Parties  shall have failed to
          perform any of their  covenants in this Agreement,  which failure,  if
          subject to cure,  has not been cured within 10 business days after the
          WinStar  Parties  have  given  notice  to LHC of  their  intention  to
          terminate,  (B) if  the  representations  and  warranties  of the  LHC
          Parties  contained in this Agreement  shall not be true and correct in
          all  respects at the time made and on the  Closing  Date or (C) if the
          conditions to the obligations of the WinStar Parties to consummate the
          transactions contemplated by this Agreement shall not have occurred by
          June 30, 1998, except that if by June 30, 1998, all of such conditions
          have occurred other than approval of such  transactions by the FTC and
          the DOJ, such approval has not been obtained by August 31, 1998.

     (b) In the event of termination by the LHC Parties or the WinStar  Parties,
or both, pursuant hereto, written notice thereof shall forthwith be given to the
other party and all further  obligations  of the  parties  under this  Agreement
shall terminate,  no party shall have any right under this Agreement against any
other party except as set forth in this Section 7, and each party shall bear its
own costs and expenses. In such event:

     (i)  If this Agreement is terminated by the LHC Parties pursuant to Section
          7(a)(ii)(A)  or (B) or by the  WinStar  Parties  pursuant  to  Section
          7(a)(iii)(A) or (B), the terminating party's right to pursue all legal
          and equitable remedies for breach of contract or otherwise, including,
          without  limitation,  Damages  relating  thereto,  shall  survive such
          termination unimpaired; and

     (ii) Nothing  herein  shall  preclude  any party,  upon a breach  hereof by
          another  party,  from  pursuing  all  equitable  remedies,   including
          specific performance,  it being acknowledged and agreed by the parties
          that the transactions contemplated hereby are of a special, unique and
          extraordinary  character  and that any breach  will cause  irreparable
          injury to the non-  breaching  party for which money  damages will not
          provide a wholly adequate remedy.

     8. Miscellaneous.

     (a) Except as otherwise provided herein, all costs and expenses, including,
without  limitation,  fees and  disbursements  of  representatives,  incurred in
connection with this Agreement and the transactions contemplated hereby shall be
paid by the party incurring such costs and expenses.




<PAGE>



     (b) All  notices and other  communications  given or made  pursuant  hereto
shall be in  writing  and shall be deemed to have been duly  given or made as of
the date delivered if delivered personally or by nationally recognized overnight
courier or by  telecopy to the parties at the  following  addresses  (or at such
other  address for a party as shall be  specified  by like  notice,  except that
notices of changes of address shall be effective upon receipt):

     If to the LHC Parties:

                                    Landover Holdings Corporation
                                    156 West 56th Street
                                    New York, New York 10019
                                    Attention:  Laurence S. Zimmerman
                                    Telecopier No.: (212) 582-1022

                                            - and -

                                    Laurence S. Zimmerman
                                    210 El Vedado Road
                                    Palm Beach, Florida 33480
                                    Telecopier No.: (561) 838-8884

     with a copy to:

                                    Hahn & Hessen LLP
                                    350 Fifth Avenue
                                    New York, New York 10118
                                    Attention:  James Kardon, Esq.
                                    Telecopier No.: (212) 594-7167


     If to the WinStar Parties:

                                    230 Park Avenue
                                    Suite 2700
                                    New York, New York  10169
                                    Attention:  Timothy R. Graham, Esq.
                                    Telecopier No.: (212) 922-1637

     with a copy to:





<PAGE>



                                    Graubard Mollen & Miller
                                    600 Third Avenue
                                    New York, New York  10016
                                    Attention:  David Alan Miller, Esq.
                                    Telecopier No.: (212) 818-8881


     (c) Neither the LHC Parties nor the WinStar  Parties  shall make any public
announcements  in respect of this  Agreement  or the  transactions  contemplated
herein  without the consent of the other,  which consent shall not  unreasonably
withheld or delayed,  except that any of the WinStar Parties may make any public
announcement  they  deem  necessary  to  comply  with  their  legal  obligations
(including  disclosure  by  means  of  filings  with the  Commission  and  other
governmental authorities),  and will use reasonable efforts to provide a copy of
such public announcement to LHC prior to the public dissemination thereof.

     (d) The WinStar  Parties may assign its rights and  obligations  under this
Agreement,  or any  portion  thereof,  to  any  wholly-owned  direct  subsidiary
(including a  non-corporate  subsidiary) of WinStar or any successor to WinStar,
provided that such assignee  shall assume in writing the rights and  obligations
so assigned and such  assignment  shall not relieve the WinStar Parties of their
obligations  hereunder  to the extent not  fulfilled by such  assignee.  The LHC
Parties  shall not assign any of its rights  under this  Agreement  without  the
prior written consent of the WinStar Parties.

     (e) This  Agreement may not be amended or modified  except by an instrument
in writing signed by the LHC Parties and the WinStar  Parties,  which instrument
shall thereupon be binding upon all the parties.

     (f) Any party may (i)  extend  the time for the  performance  of any of the
obligations or other acts of any other party, (ii) waive any inaccuracies in the
representations  and warranties  contained  herein or in any document  delivered
pursuant  hereto  and  (iii)  waive  compliance  with any of the  agreements  or
conditions contained herein. Any such extension or waiver shall be valid only if
set forth in an instrument in writing signed by the party to be bound thereby.

     (g) If any provision of this Agreement is determined to be invalid, illegal
or  incapable  of being  enforced by a court or  regulatory  agency of competent




<PAGE>



jurisdiction,  the other  provisions of this Agreement shall not be affected and
shall  remain in full force and effect and the parties  shall  negotiate in good
faith  revisions to this  Agreement  so as to effect the original  intent of the
parties pursuant to the provision so affected.

     (h) This Agreement and the Indemnity Agreement among the parties executed
concurrently  with the execution of this Agreement,  together with the Schedules
and Exhibits  hereto  (including  the Escrow  Agreement),  constitute the entire
agreement, and supersede all prior agreements and undertakings, both written and
oral,  among the parties,  with respect to the subject matter hereof and thereof
and, except as otherwise  expressly  provided herein, are not intended to confer
upon any other person any rights or remedies hereunder.

     (i) This  Agreement  shall inure to the benefit of and be binding  upon the
successors, distributees and assigns of the parties.

     (j) This Agreement shall be governed by, and construed in accordance  with,
the law of the State of New York,  without  regard to principles of conflicts of
law. EACH PARTY HEREBY  IRREVOCABLY  CONSENTS AND SUBMITS TO THE JURISDICTION OF
ANY NEW YORK STATE OR UNITED  STATES  FEDERAL  COURT SITTING IN THE STATE OF NEW
YORK,  COUNTY  OF NEW YORK  OVER ANY  ACTION  OR  PROCEEDING  ARISING  OUT OF OR
RELATING TO THIS  AGREEMENT AND  IRREVOCABLY  CONSENTS TO THE SERVICE OF ANY AND
ALL PROCESS IN ANY SUCH ACTION OR  PROCEEDING BY  REGISTERED  MAIL  ADDRESSED TO
SUCH PARTY AT ITS ADDRESS  SPECIFIED IN SECTION 8(b).  EACH PARTY FURTHER WAIVES
ANY  OBJECTION TO VENUE IN NEW YORK AND ANY OBJECTION TO AN ACTION OR PROCEEDING
IN SUCH STATE AND COUNTY ON THE BASIS OF FORUM NON  CONVENIENS.  EACH PARTY ALSO
WAIVES ANY RIGHT TO TRIAL BY JURY.

     (k) This Agreement may be executed in one or more counterparts,  and by the
different parties in separate counterparts, each of which when executed shall be
deemed to be an original but all of which when taken together  shall  constitute
one and the same agreement.

     (l) No  provision  of this  Agreement  or any  other  instrument  or  other
document delivered in connection with the transactions  contemplated hereby will




<PAGE>


be  interpreted  in favor of, or  against,  any of the  parties by reason of the
extent to which such party or its counsel participated in the drafting hereof or
by reason of the extent to which any such  provision  is  inconsistent  with any
prior draft hereof or thereof.







                    THE FOLLOWING PAGE IS THE SIGNATURE PAGE







<PAGE>


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

                                WINSTAR COMMUNICATIONS, INC.

                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President



                                WINSTAR LHC1 LLC
                                By:      WINSTAR COMMUNICATIONS, INC., Member

                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President


                                 WINSTAR LHC2 LLC
                                 By:      WINSTAR COMMUNICATIONS, INC., Member
                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President



                                 LANDOVER HOLDINGS CORPORATION

                         
                                        /s/ Laurence S. Zimmerman
                                 By:_________________________________
                                    Name: Laurence S. Zimmerman
                                    Title: President


                                        /s/ Laurence S. Zimmerman
                                   ___________________________________
                                   LAURENCE S. ZIMMERMAN





<PAGE>

                               INDEMNITY AGREEMENT


         AGREEMENT  dated April 24, 1998 among WINSTAR  COMMUNICATIONS,  INC., a
Delaware corporation ("WinStar"), WINSTAR LHC1 LLC, a New York limited liability
company of which WinStar is the sole member ("WinLLC1"), WINSTAR LHC2 LLC, a New
York limited  liability  company of which WinStar is the sole member  ("WinLLC2"
and,  together with  WinLLC1,  the "LLCs"),  LANDOVER  HOLDINGS  CORPORATION,  a
Delaware  corporation  ("LHC"),  and LAURENCE S.  ZIMMERMAN,  residing at 210 El
Vedado Road, Palm Beach,  Florida 33480 ("Zimmerman" and, together with LHC, the
"LHC Parties").

                                    RECITALS:

         A.  The  parties  hereto,  concurrently  with  the  execution  of  this
Agreement,   have  entered  into  an  Agreement   and  Plan  of   Reorganization
("Reorganization  Agreement")  relating  to the  acquisition  by the LLCs of the
Historic Business and Historic Business Assets of LHC.

         B.  Capitalized  terms used herein and not  otherwise  defined have the
meanings ascribed to them in the Reorganization Agreement.

         IT IS AGREED:

     (a) The LHC  Parties,  jointly  and  severally,  shall  indemnify  and hold
harmless the WinStar  Parties from and against,  and shall reimburse the WinStar
Parties  for,  any  Damages (as  hereinafter  defined)  which may be  sustained,
suffered  or  incurred  by any of the  WinStar  Parties,  whether as a result of
third-party  claims or otherwise,  and which arise from or in connection with or
are  attributable  to (i) the breach of any of  representations,  warranties  or
covenants of the LHC Parties contained in the Reorganization Agreement, (ii) any
liabilities or  obligations  of LHC,  whether  arising  before,  on or after the
Closing Date, other than the Assumed  Liabilities and (iii) the ownership of the
Shares and Other  Assets on or before the Closing  Date.  This  indemnity  shall
survive the Closing for a period of one year after the Closing  Date except that
with respect to claims  arising as a result of a breach or alleged breach of the
representations  and warranties in Sections 3(c) and 3(j) of the  Reorganization
Agreement  and  the  covenants  contained  in  Sections  5(h)  and  5(i)  of the
Reorganization  Agreement,  it shall survive without  limitation as to time. Any
claim for  indemnity  asserted  within the relevant  period shall  survive until
resolved.





<PAGE>



     (b) The WinStar  Parties,  jointly and severally,  shall indemnify and hold
harmless the LHC Parties from and against,  and shall  reimburse the LHC Parties
for, any Damages which may be sustained,  suffered or incurred by any LHC Party,
whether as a result of third-party claims or otherwise,  and which arise from or
in  connection  with  or  are  attributable  to  (i)  the  breach  of any of the
representations,  warranties and covenants of the WinStar  Parties  contained in
the Reorganization Agreement, (ii) the ownership of the Shares after the Closing
Date, and (iii) any of the following  occurring within the eighteen month period
after the Closing Date: (A) the  acquisition by WinStar  (separately or with one
or more of its affiliates (as defined under  Regulation D promulgated  under the
1933 Act)) of any voting  securities of ARTT or options,  warrants or securities
convertible  into or exercisable or exchangeable  for voting  securities of ARTT
(other  than the  Shares  and the  Additional  ARTT  Shares),  (B) the making or
participation  in any manner by WinStar in any  "solicitation"  of "proxies" (as
such terms are used in the proxy rules of the Commission  promulgated  under the
Exchange Act) to vote  securities of ARTT or the seeking by WinStar to advise or
influence  any  person or  entity  with  respect  to the  voting  of any  voting
securities of ARTT, (C) WinStar otherwise seeking representation on the Board of
Directors ("Board") of ARTT or to control or influence the management,  Board or
policies of ARTT, (D) an executive officer or director of WinStar  disclosing to
any third party any  intention,  plan or  arrangement  to effectuate  any of the
foregoing or (E) WinStar advising,  assisting or encouraging any other person in
connection  with the  foregoing,  other  than  Damages  sustained,  suffered  or
incurred by a LHC Party as a result of (x) in the case of the  foregoing  clause
(A), a claim (other than by a WinStar  Party or a  stockholder  of WinStar) that
the  consideration  paid by the WinStar  Parties for the Shares is  excessive in
relation to the consideration  paid for such other shares and (y) in the case of
any of the foregoing  clauses (A) through (E), a breach or alleged breach by any
LHC Party (or any  affiliate  thereof) of any  obligation  to ARTT  arising from
activities or agreements of a LHC Party (or any affiliate  thereof) prior to the
Closing  Date;  provided  that the WinStar  Parties  shall have no obligation to
indemnify the LHC Parties hereunder,  or any other liability to the LHC Parties,
with respect to a breach of the  representations,  warranties  and  covenants in
Sections  4(h) or 5(m) of the  Reorganization  Agreement  unless there is also a
breach of the covenant in Section 5(n) of the Reorganization Agreement occurring
on or before the later of one year from the  Closing  Date or June 30, 1999 as a
result of actions or omissions  attributable  to the WinStar  Parties (for which
purpose actions or omissions of the consultant  under the JPW Agreement not done
at the  direction  of a WinStar  Party will not be  attributable  to the WinStar
Parties).  Subject to the proviso of the immediately  preceding  sentence,  this
indemnity  shall  survive the Closing for a period of one year after the Closing
Date except that with  respect to claims arising (A) as  a result of a breach or




<PAGE>



alleged breach of the representations, warranties or covenants in Sections 1(c),
4(f),  4(h),  5(g),  5(m) and  5(n) of the  Reorganization  Agreement,  it shall
survive  without  limitation  as to time,  and (B) under clause (iii) above,  it
shall  survive for a period of 20 months after the Closing  Date.  Any claim for
indemnity asserted within the relevant period shall survive until resolved.

     (c) If, on the date  ("Determination  Date") which is the later of one year
from the Closing Date or June 30, 1999,  the net asset value of the  Transferred
Accounts  (after  deducting  therefrom all expenses of the WinStar Parties under
the JPW Agreement) (the "1999 Asset Value") is less than $900,000, other than as
a result of actions or omissions  attributable to the WinStar Parties (for which
purpose actions or omissions of the consultant  under the JPW Agreement not done
at the  direction  of a WinStar  Party will not be  attributable  to the WinStar
Parties),  the LHC Parties shall reimburse WinLLC2,  in cash, in an amount equal
to  the  difference  between  $900,000  and  the  1999  Net  Asset  Value.  Such
reimbursement  shall be treated as a reduction in the value of the consideration
paid by the WinStar  Parties for the Shares and the Other Assets.  Any claim for
payment by the WinStar  Parties  pursuant to this Paragraph (c) shall be made no
later  than 30 days  after  the  Determination  Date or,  if such  date is not a
business day, the next succeeding business day.

     (d) As security for the payment of amounts  which may be due to the WinStar
Parties  pursuant to the  obligations  of LHC in Paragraphs  (a) and (c) of this
Agreement, on the Closing Date LHC shall deliver to Hahn & Hessen LLP, as escrow
agent,  139,000 of the WinStar Shares, to be held and disposed of by such escrow
agent pursuant to the terms of the Escrow Agreement.

     (e) As used herein, the term "Damages" means the dollar amount of any loss,
damage,  expense  or  liability,   including,  without  limitation,   reasonable
attorneys' fees and disbursements incurred by an indemnified party in any action
or  proceeding  between  the  indemnified  party and the  indemnifying  party or
between the  indemnified  party and a third party,  which is  determined to have
been sustained, suffered or incurred by a party and to have in arisen from or in
connection  with an event or state of facts which is subject to  indemnification
under  this  Agreement.  The  amount  of  Damages  shall be the  amount  finally
determined  by a court of competent  jurisdiction  (after the  exhausting of all
appeals) or the amount agreed to upon settlement in accordance with the terms of
this Agreement,  if a third-party claim, or by the parties, if a direct claim of
one party against another.





<PAGE>



     (f) A party required to make an  indemnification  payment  pursuant to this
Agreement  ("Indemnifying  Party")  shall have no liability to make such payment
unless the party entitled to receive such indemnification  payment ("Indemnified
Party")  gives notice to the  Indemnifying  Party  specifying  (i) the covenant,
representation or warranty  contained in the  Reorganization  Agreement which it
asserts has been  breached,  (ii) in  reasonable  detail,  the nature and dollar
amount of any claim the  Indemnified  Party may have  against  the  Indemnifying
Party by reason thereof under this  Agreement,  and (iii) whether the claim is a
third-party  claim  or a direct  claim  of the  Indemnified  Party  against  the
Indemnifying Party.

     (g) If an Indemnified  Party becomes aware of a third-party claim for which
an Indemnifying  Party would be liable to an Indemnified  Party  hereunder,  the
Indemnified  Party  shall,  with  reasonable  promptness,  notify in writing the
Indemnifying  Party of such claim,  identifying the basis for such claim and the
amount or the estimated  amount  thereof to the extent then  determinable  which
estimate  shall not be  conclusive of the final amount of such claim (the "Claim
Notice"); provided, however, that any failure to give such Claim Notice will not
be deemed a waiver of any rights of the  Indemnified  Party except to the extent
the rights of the  Indemnifying  Party are actually  prejudiced by such failure.
The  Indemnifying  Party,  upon request of the Indemnified  Party,  shall retain
counsel  (who  shall be  reasonably  acceptable  to the  Indemnified  Party)  to
represent the  Indemnified  Party and shall pay the reasonable fees and expenses
of such counsel with regard  thereto;  provided,  however,  that any Indemnified
Party is  hereby  authorized,  prior to the  date on which it  receives  written
notice from the Indemnifying Party designation such counsel,  to retain counsel,
whose  reasonable fees and expenses shall be at the expense of the  Indemnifying
Party,  to file any motion,  answer or other pleading and take such other action
which it  reasonably  shall deem  necessary to protect its interests or those of
the  Indemnifying  Party until the date on which the Indemnified  Party receives
such notice  from the  Indemnified  Party.  After the  Indemnifying  Party shall
retain such counsel,  the  Indemnified  Party shall have the right to retain its
own counsel,  but the fees and expenses of such counsel  shall be at the expense
of such Indemnified party unless (i) the Indemnifying  Party and the Indemnified
Party shall have  mutually  agreed to the  retention of such counsel or (ii) the
named parties of any such proceeding  (including any impleaded parties) included
both the Indemnifying Party and the Indemnified Party and representation of both
parties by the same counsel  would be  inappropriate  due to actual or potential
differing  interests  between them. If requested by the Indemnifying  Party, the
Indemnified  Party  agrees  to  cooperate  with the  Indemnifying  Party and its
counsel in contesting any claim or demand which the Indemnifying  Party defends.




<PAGE>



A claim or demand  may not be  settled by any party  without  the prior  written
consent of the other party  (which  consent will not be  unreasonably  withheld)
unless,  as part of such settlement,  the Indemnified Party shall receive a full
and unconditional  release reasonably  satisfactory to it.  Notwithstanding  the
foregoing,  the Indemnifying  Party may settle any third-party claim without the
prior written consent of the Indemnified  Party if such claim is exclusively for
monetary damages.

     (h) If  any  Indemnified  Party  shall  have a  direct  claim  against  any
Indemnifying  Party hereunder,  the Indemnified  Party shall send a Claim Notice
with respect to such claim to the Indemnifying Party.

     (i) No  Indemnifying  Party shall be required to indemnify  an  Indemnified
Party pursuant to this  Agreement  unless the aggregate of all amounts for which
indemnity would otherwise be due against it exceeds $50,000 and then only to the
extent such amounts  exceed $50,000 and do not exceed (i) $3,000,000 in the case
of a breach of the  representations,  warranties  and  covenants  of the WinStar
Parties in Sections 4(h),  5(m) and 5(n) of the  Reorganization  Agreement,  and
(ii)  $8,500,000  in any  other  case.  For  purposes  of  this  Paragraph  (i),
"Indemnified  Party" means the LHC Parties  collectively  or the WinStar Parties
collectively, as the case may be. The provisions of this Paragraph (i) shall not
apply with respect to a claim for  indemnification  based on a breach or alleged
breach of the  covenants  of the LHC  Parties in  Sections  5(h) and 5(i) of the
Reorganization Agreement.

     (j) The LHC Parties shall promptly  notify WinStar if the Internal  Revenue
Service examines LHC's or Zimmerman's  respective  Federal income tax returns in
which the transactions contemplated by the Reorganization Agreement are reported
as qualifying as a  "reorganization"  within the meaning of IRC  ss.368(a)(1)(C)
and shall keep WinStar  reasonably  and currently  informed of the status of any
such examination,  in each case solely to the extent that it relates to LHC's or
Zimmerman's reporting of such transactions as so qualifying.

     (k) The  provisions  of this  Agreement  shall be the sole  recourse of the
parties for Damages with respect to breaches of the representations,  warranties
and covenants of the parties under the Reorganization  Agreement,  except in the
case of fraud and provided that the parties shall not be precluded  from seeking
equitable remedies,  including without limitation specific  performance.  If the
Reorganization  Agreement is  terminated  prior to the Closing,  this  Agreement
shall also terminate.




<PAGE>


     (l) The provisions of Section 8 of the Reorganization Agreement shall apply
to this Agreement as if fully set forth herein.

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


                                WINSTAR COMMUNICATIONS, INC.

                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President



                                WINSTAR LHC1 LLC
                                By:      WINSTAR COMMUNICATIONS, INC., Member

                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President


                                 WINSTAR LHC2 LLC
                                 By:      WINSTAR COMMUNICATIONS, INC., Member
                         
                                        /s/ T. R. Graham
                                 By:_________________________________
                                    Name: T. R. Graham
                                    Title: Executive Vice President



                                 LANDOVER HOLDINGS CORPORATION

                         
                                        /s/ Laurence S. Zimmerman
                                 By:_________________________________
                                    Name: Laurence S. Zimmerman
                                    Title: President


                                        /s/ Laurence S. Zimmerman
                                   ___________________________________
                                   LAURENCE S. ZIMMERMAN



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