<PAGE>
-----------------------------
OMB APPROVAL
OMB Number: 3235-0145
Expires: December 31, 1997
Estimated average burden
hours per response...14.90
-----------------------------
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO.----)*
ADVANCED RADIO TELECOM CORP.
- -------------------------------------------------------------------------------
(Name of Issuer)
COMMON STOCK, PAR VALUE $.001
- -------------------------------------------------------------------------------
(Title of Class of Securities)
00754U-10-1
-------------------------------
(CUSIP Number)
Check the following box if a fee is being paid with this statement [x]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>
- ------------------------ -----------------------
CUSIP No. 00754U-10-1 13G Page 2 of 8
------------- --- ----
- ------------------------ -----------------------
- -------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON
LANDOVER HOLDINGS CORPORATION
- -------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
(a) [X]
(b) [ ]
- -------------------------------------------------------------------------------
3. SEC USE ONLY
- -------------------------------------------------------------------------------
4. CITIZENSHIP OR PLACE OF ORGANIZATION
DELAWARE
- -------------------------------------------------------------------------------
5. SOLE VOTING POWER
NONE
NUMBER OF
-------------------------------------------------
SHARES 6. SHARED VOTING POWER
BENEFICIALLY
OWNED BY NONE
EACH -------------------------------------------------
REPORTING 7. SOLE DISPOSITIVE POWER
PERSON
WITH: 2,909,718
-------------------------------------------------
8. SHARED DISPOSITIVE POWER
NONE
- -------------------------------------------------------------------------------
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.
2,909,718
- -------------------------------------------------------------------------------
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[X]
Includes 15,672 shares issuable upon the exercise of warrants. Does not include
36,364 shares of Common Stock beneficially owned by Kimberly Zimmerman, the wife
of Laurence S. Zimmerman (who controls Landover Holdings Corporation) and 36,364
shares of Common Stock beneficially owned by the Zachary Tyler Zimmerman Trust,
a trust for the benefit of the son of Laurence S. Zimmerman, of which shares
Landover Holdings Corporation disclaims beneficial ownership.
- -------------------------------------------------------------------------------
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.
14.9%
- -------------------------------------------------------------------------------
12. TYPE OF REPORTING PERSON*
CO
- -------------------------------------------------------------------------------
* SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ---------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 3 of 8
------------- --- ---
- ---------------------------- -----------------------------
- -----------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON
KIMBERLY ZIMMERMAN
- -------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
(a) [X]
(b) [ ]
- -------------------------------------------------------------------------------
3. SEC USE ONLY
- -------------------------------------------------------------------------------
4. CITIZENSHIP OR PLACE OF ORGANIZATION
THE UNITED STATES OF AMERICA
- -------------------------------------------------------------------------------
5. SOLE VOTING POWER
NONE
NUMBER OF -------------------------------------------------
SHARES 6. SHARED VOTING POWER
BENEFICIALLY
OWNED BY NONE
EACH -------------------------------------------------
REPORTING 7. SOLE DISPOSITIVE POWER
PERSON
WITH: 36,364
-------------------------------------------------
8. SHARED DISPOSITIVE POWER
NONE
- -------------------------------------------------------------------------------
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.
36,364
- -------------------------------------------------------------------------------
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[x]
Does not include 2,909,718 shares of Common Stock beneficially owned by Landover
Holdings Corporation (which is controlled by the Reporting Person's husband) or
36,364 shares of Common Stock beneficially owned by the Zachary Tyler Zimmerman
Trust (of which the Reporting Person is the trustee), of which shares the
Reporting Person disclaims beneficial ownership.
- -------------------------------------------------------------------------------
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.
0.2%
- -------------------------------------------------------------------------------
12. TYPE OF REPORTING PERSON*
IN
- -------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- --------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 4 of 8
--------------- --- ---
- --------------------------- -----------------------------
- -------------------------------------------------------------------------------
1. NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NUMBER OF ABOVE PERSON
ZACHARY TYLER ZIMMERMAN TRUST
- -------------------------------------------------------------------------------
2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
(a) [X]
(b) [ ]
- -------------------------------------------------------------------------------
3. SEC USE ONLY
- -------------------------------------------------------------------------------
4. CITIZENSHIP OR PLACE OF ORGANIZATION
NEW YORK
- -------------------------------------------------------------------------------
5. SOLE VOTING POWER
NONE
NUMBER OF -------------------------------------------------
SHARES 6. SHARED VOTING POWER
BENEFICIALLY
OWNED BY NONE
EACH -------------------------------------------------
REPORTING 7. SOLE DISPOSITIVE POWER
PERSON
WITH: 36,364
-------------------------------------------------
8. SHARED DISPOSITIVE POWER
NONE
- -------------------------------------------------------------------------------
9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON.
36,364
- -------------------------------------------------------------------------------
10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[X]
Does not include 36,364 shares of Common Stock beneficially owned by Kimberly
Zimmerman (who is trustee of the Reporting Person), and 2,909,718 shares of
Common Stock beneficially owned by Landover Holdings Corporation (which is
controlled by the husband of the trustee of the Reporting Person), of which
shares the Reporting Person disclaims beneficial ownership.
- -------------------------------------------------------------------------------
11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9.
0.2%
- -------------------------------------------------------------------------------
12. TYPE OF REPORTING PERSON*
OO
- -------------------------------------------------------------------------------
*SEE INSTRUCTION BEFORE FILLING OUT!
<PAGE>
- ---------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 5 of 8
--------------- --- ---
- ---------------------------- -----------------------------
- -------------------------------------------------------------------------------
SCHEDULE 13G
Item 1.
- -------
(a) (b) This statement on Schedule 13G relates to the Reporting Persons'
(as defined in Item 2 below) beneficial ownership interest in Advanced Radio
Telecom Corp. a Delaware corporation (the "Corporation"). The address of the
principal executive office of the Corporation is 500 108th Avenue, N.E., Suite
2600, Bellevue, Washington 98004.
Item 2.
- -------
(a) (b) (c) This statement is being filed by the following entities:
(1) Landover Holdings Corporation, a Delaware corporation;
(2) Kimberly Zimmerman, a United States citizen; and
(3) Zachary Tyler Zimmerman Trust, a trust.
The entities listed in subparagraphs (1) through (3) above are herein
collectively referred to as the "Reporting Persons" and individually as a
"Reporting Person." The principal business address of the entities listed in
subparagraphs (1) through (3) is c/o Landover Holdings Corporation, 156 West
56th Street, Suite 2001, New York, NY, 10019.
(d) (e) This statement relates to the Common Stock, par value $.001 per
share, (the "Common Stock") of the Corporation named in Item 1 of this
statement. The CUSIP number associated with such Common Stock is 00754U-10-1.
<PAGE>
- ---------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 6 of 8
--------------- --- ---
- ---------------------------- -----------------------------
- -------------------------------------------------------------------------------
SCHEDULE 13G
Item 3. Filing pursuant to Rule 13d-1(b), or 13d-2(b).
- ------- ----------------------------------------------
This statement is not being filed pursuant to Rule 13d-1(b), or 13d-2(b).
Item 4. Ownership.
- ------- ----------
(a) (b) (c) The following table sets forth the aggregate number and
percentage (based upon the number of shares of Common Stock outstanding as of
March 31,1997) of the Common Stock beneficially owned by each Reporting Person
named in Item 2 of this statement. The aggregate number and percentage of the
Common Stock beneficially owned by each Reporting Person is calculated in
accordance with Rule 13d-3(d)(1).
<TABLE>
<CAPTION>
NUMBER OF SHARES
--------------------------------------------------
Reporting Person Common Warrants Total Percentage of Shares
Outstanding
- -----------------------------------------------------------------------------------------
<S> <C> <C> <C> <C>
Landover Holdings Corporation (1) (2) 2,894,046 15,672 2,909,718 14.9%
Kimberly Zimmerman (1) (3) 36,364 0 36,364 0.2%
Zachary Tyler Zimmerman Trust (1) (4) 36,364 0 36,364 0.2%
--------- ------ --------- -----
Total Group Ownership (5) 2,982,446 15,672 2,982,446 15.2%
========= ====== ========= =====
</TABLE>
(1) Vernon L. Fotheringham, Mark C. Demetree, and Andrew I. Fillat, as
trustees under the Voting Trust Agreement dated November 5, 1996 (the "LHC
Voting Trust"), have the sole right to vote the shares beneficially owned by
Landover Holdings Corporation, Kimberly Zimmerman and Zachary Tyler Zimmerman
Trust. The LHC Voting Trust is obliged to vote all such shares on all matters
submitted to a vote of the stockholders of the Company in proportion to, or in
certain cases, consistent with the majority of, the vote of other stockholders
of the Company.
(2) Landover Holdings Corporation is controlled by Laurence S. Zimmerman.
(3) Kimberly Zimmerman is the wife of Laurence S. Zimmerman, and trustee of
the Zachary Tyler Zimmerman Trust.
(4) The Zachary Tyler Zimmerman Trust is a family trust of Laurence S.
Zimmerman.
(5) Each Reporting Person disclaims beneficial ownership of the shares
beneficially owned by the other Reporting Persons.
<PAGE>
- ---------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 7 of 8
--------------- --- ---
- ---------------------------- -----------------------------
- -------------------------------------------------------------------------------
SCHEDULE 13G
Item 5. Ownership of Five Percent or Less of a Class.
- ------- -----------------------------------------------------------
Not Applicable.
Item 6. Ownership of More than Five Percent on Behalf of Another Person.
- ------- ----------------------------------------------------------------
Not Applicable.
Item 7. Identification and Classification of the Subsidiary Which Acquired the
- ------- ---------------------------------------------------------------------
Security Being Reported on by the Parent Holding Company.
---------------------------------------------------------
Not Applicable.
Item 8. Identification and Classification of Members of the Group.
- ------- ----------------------------------------------------------
The information for this item is contained on the individual cover
pages to this filing, and is incorporated herein by reference.
Item 9. Notice of Dissolution of Group.
- ------- -------------------------------
Not Applicable.
(THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK)
-------------------------------------------------------
<PAGE>
- ---------------------------- -----------------------------
CUSIP No. 00754U-10-1 13G Page 8 of 8
--------------- --- ---
- ---------------------------- -----------------------------
- -------------------------------------------------------------------------------
SCHEDULE 13G
Item 10. Certification.
- -------- --------------
By signing below we certify that, to the best of our knowledge and belief,
the securities referred to above were acquired in the ordinary course of
business and were not acquired for the purpose of and do not have the effect of
changing or influencing the control of the issuer of such securities and were
not acquired in connection with or as a participant in any transaction having
such purposes or effect.
SIGNATURE
------------
After reasonable inquiry and to the best of our knowledge and belief, we
certify that the information set forth in this statement is true, complete and
correct.
May 22, 1997
LANDOVER HOLDINGS CORPORATION
By: /s/ Laurence S. Zimmerman
---------------------------
Laurence S. Zimmerman
President
/s/ Kimberly Zimmerman
----------------------
Kimberly Zimmerman
ZACHARY TYLER ZIMMERMAN TRUST
By: /s/ Kimberly Zimmerman
----------------------
Kimberly Zimmerman
Trustee
s
