<PAGE>
U.S. SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 12b-25
Commission File No. 0-13493 CUSIP No. None
NOTIFICATION OF LATE FILING
[ ] Form 10-K and 10 KSB [ ] Form 11-K
[ X ] Form 10-Q and Form 10-QSB [ ] Form N-SAR
For the Period Ended March 31, 2000
Nothing in this Form shall be construed to imply that the
Commission has verified any information contained herein.
- --------------------------------------------------------------------------------
PART I. Registration Information
- --------------------------------------------------------------------------------
Twelve AMH Associates Limited Partnership
-----------------------------------------
(Full Name of Registrant)
5 Cambridge Center, 9th Floor, Cambridge, Massachusetts 02142
- ------------------------------------------------------- -------
(Address of Principal Executive Office) (Zip Code)
- --------------------------------------------------------------------------------
PART II. Rules 12b-25(b) and (c)
- --------------------------------------------------------------------------------
If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed.
(Check box if appropriate.)
(a) The reasons described in reasonable detail in Part III of this Form
could not be eliminated without reasonable effort or expense;
[X] (b) The subject quarterly report will be filed on or before the fifth
calendar day following the prescribed due date; and
(c) The accountant's statement or other exhibit required by Rule 12b-25(c)
has been attached if applicable.
- --------------------------------------------------------------------------------
PART III. Narrative
- --------------------------------------------------------------------------------
The registrant was unable to obtain all necessary information to
prepare the quarterly report prior to its due date. The registrant will file its
Form 10-QSB report prior to the expiration of the 5th-day extension period.
<PAGE>
- --------------------------------------------------------------------------------
PART IV. Other Information
- --------------------------------------------------------------------------------
(1) Name and telephone number of person in contact in regard to this
notification:
David J. Heymann 516 681-3636
---------------- --- --------
(Name) (Area Code) (Telephone Number)
(2) Have all other periodic reports required under Section 13 or 15(d) of the
Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of
1940 during the preceding 12 months or for such shorter period that the
registrant was required to file such report(s) been filed? If the answer is no,
identify report(s).
YES [ X ] NO [ ]
(3) Is it anticipated that any significant change in results of operations from
the corresponding period for the last fiscal year will be reflected by the
earnings statements to be included in the subject report or portion thereof?
YES [ ] NO [ X ]
Twelve AMH Associates Limited Partnership
-----------------------------------------
(Name of registrant as specified in charter)
has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.
Date: May 16, 2000 Twelve AMH Associates Limited Partnership
By: Two Winthrop Properties, Inc.
Managing General Partner
By: /s/ Michael L. Ashner
-------------------------
Michael L. Ashner
Chief Executive Officer