ANGELES PARTNERS XII
SC 14D1/A, 1999-09-23
REAL ESTATE
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<PAGE>

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                 SCHEDULE 14D-1
                             TENDER OFFER STATEMENT
      Pursuant to Section 14(d)(1) of the Securities Exchange Act of 1934
                               (Amendment No. 2)

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

                              ANGELES PARTNERS XII
                           (Name of Subject Company)

                       ERP OPERATING LIMITED PARTNERSHIP
                                    (Bidder)

                         LIMITED PARTNERSHIP INTERESTS
                         (Title of Class of Securities)

                                      NONE
                     (CUSIP Number of Class of Securities)

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

                                    Copy to:
        Bruce C. Strohm, Esq.                     Don S. Hershman, Esq.
 Equity Residential Properties Trust                  Holleb & Coff
      Two North Riverside Plaza                   55 East Monroe Street
       Chicago, Illinois 60606                   Chicago, Illinois 60606
           (312) 474-1300                            (312) 807-4600

            (Name, Address and Telephone Number of Person Authorized
           to Receive Notices and Communications on Behalf of Bidder)

                           CALCULATION OF FILING FEE
- --------------------------------------------------------------------------------
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<TABLE>
<CAPTION>
           Transaction Valuation*                           Amount of Filing Fee
- --------------------------------------------------------------------------------
<S>                                            <C>
                 $36,445,170                                     $7,289.03
- --------------------------------------------------------------------------------
</TABLE>
- --------------------------------------------------------------------------------

*  For purposes of calculating the filing fee only. Assumes the purchase of
   44,718 Units at a purchase price equal to $815 per Unit in cash.

[X]Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
   and identify the filing with which the offsetting fee was previously paid.
   Identify the previous filing by registration statement number, or the Form
   or Schedule and the date of its filing.

  Amount Previously Paid:  $3,287              Filing Party: ERP Operating
                                                             Limited Partnership
  Form or Registration Number: Schedule 14D-1  Date Filed: September 2, 1999
                                                           and amended on
                                                           September 10, 1999



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<PAGE>

                       AMENDMENT NO. 2 TO SCHEDULE 14D-1

   This statement (the "Statement") constitutes Amendment No. 2 to the initial
Schedule 14D-1 of ERP Operating Limited Partnership ("ERP") relating to ERP's
offer to purchase limited partnership interests (the "Units") of Angeles
Partners XII (the "Partnership"). The item numbers and responses thereto are
set forth below in accordance with the requirements of Schedule 14D-1.

Items 1-10.

   Expect as follows, incorporated by reference from ERP's Offer to Purchase
dated September 2, 1999 and amended on September 10, 1999, the Letter of
Transmittal dated September 2, 1999, the Form of Letter to Unitholders dated
September 2, 1999, and the Letter from ERP to the Unitholders of the
Partnership dated September 10, 1999.

Item 1. Security and Subject Company.

   (b) This Schedule relates to the offer by ERP OPERATING LIMITED PARTNERSHIP
("ERP") to purchase 44,718 Units, subject to certain pro rations, at a
purchase price per Unit, net to the Seller, of $815 in cash (less the amount
of any distributions declared or made with respect to the Units between August
20, 1999 and October 15, 1999 or such other date to which this Offer may be
extended (the "Expiration Date"), upon the terms and subject to the conditions
set forth in ERP's Offer to Purchase, dated September 2, 1999 (the "Offer
Date") (as amended or supplemented from time to time, the "Offer to
Purchase"), an amendment to the Offer to Purchase dated September 10, 1999, a
supplement to the Offer to Purchase dated September 23, 1999 (the
"Supplement"), and the related letter of transmittal and instructions thereto
(as amended and supplemented from time to time, the "Letter of Transmittal"),
copies of which are filed as exhibits as listed below. The Issuer has 44,718
Units issued and outstanding held by approximately, 2,600 holders of Units
(the "Unitholders") as of December 31, 1998, according to its Annual Report on
Form 10-K.

Item 11. Material to be Filed as Exhibits.

<TABLE>
<CAPTION>

     <C>       <S>                                                          <C>
     (a)(1)    Offer to Purchase, dated September 2, 1999 (previously
               filed).
     (a)(2)    Letter of Transmittal.
     (a)(3)    Form of Letter to Unitholders dated September 2, 1999
               (previously filed).
     (a)(4)    Letter, dated September 10, 1999, from ERP Operating
               Limited Partnership to the Unitholders of the Partnership
               (previously filed).
     (a)(5)    Supplement to Offer to Purchase, dated September 23, 1999.
     (a)(6)    Letter, dated September 23, 1999, from ERP Operating
               Limited Partnership to the Unitholders of the Partnership.
     (b)-(f)   Not Applicable.
</TABLE>
<PAGE>

                                   SIGNATURE

   After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and
correct.

Dated: September 23, 1999

                                          ERP Operating Limited Partnership

                                          By: Equity Residential Properties
                                           Trust, General Partner

                                              /s/ Bruce C. Strohm
                                          By: _________________________________

                                              Executive Vice President,
                                              General
                                          Its: ________________________________

                                              Counsel and Secretary
                                              _________________________________

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit No.                          Description
 -----------                          -----------
 <C>         <S>                                                            <C>
 (a)(1)      Offer to Purchase, dated September 2, 1999 (previously
             filed).
 (a)(2)      Letter of Transmittal.
 (a)(3)      Form of Letter to Unitholders, dated September 2, 1999
             (previously filed).
 (a)(4)      Letter, dated September 10, 1999, from ERP Operating Limited
             Partnership to the Unitholders of the Partnership
             (previously filed).
 (a)(5)      Supplement to Offer to Purchase, dated September 23, 1999.
 (a)(6)      Letter, dated September 23, 1999, from ERP Operating Limited
             Partnership to the Unitholders of the Partnership.
 (b)-(f)     Not Applicable.
</TABLE>

<PAGE>

                             LETTER OF TRANSMITTAL

                                To Tender Units
                                      of
                             ANGELES PARTNERS XII
                       Pursuant to the Offer to Purchase
                            Dated September 2, 1999
                                      by
                       ERP OPERATING LIMITED PARTNERSHIP

   WE ARE OFFERING TO PURCHASE UNITS IN YOUR PARTNERSHIP FOR $815 PER UNIT.


    THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, CENTRAL
  STANDARD TIME, ON OCTOBER 15, 1999 (THE "Expiration Date") UNLESS EXTENDED.


                       The Depositary for the Offer is:

                     MMS ESCROW AND TRANSFER AGENCY, INC.

 By Hand or Overnight Courier:            By Mail:

 MMS Escrow and Transfer Agency, Inc.     MMS Escrow and Transfer Agency, Inc.
 1845 Maxwell St., Suite 101              P.O. Box 7090
 Troy, MI 48084                           Troy, MI 48007

 By Facsimile: (248) 614-4536


  If you require additional information, please call the Depositary at (888)
                                   292-4264.

   To participate in the Offer, a duly executed copy of this Letter of
Transmittal and any other documents required by this Letter of Transmittal
must be received by the Depositary on or prior to the Expiration Date.
Delivery of this Letter of Transmittal or any other required documents to an
address other than as set forth above does not constitute valid delivery. The
method of delivery of all documents is at the election and risk of the
tendering Unitholder. Please use the pre-addressed, postage-paid envelope
provided.

   This Letter of Transmittal is to be completed by holders of Units of
limited partnership interest in ANGELES PARTNERS XII, a California limited
partnership (the "Partnership"), pursuant to the procedures set forth in the
Offer to Purchase (as defined below). Capitalized terms used herein and not
defined herein have the meanings ascribed to such terms in the Offer to
Purchase.
<PAGE>

              PLEASE CAREFULLY READ THE ACCOMPANYING INSTRUCTIONS

Ladies and Gentlemen:

   The undersigned hereby tenders to ERP OPERATING LIMITED PARTNERSHIP (the
"Purchaser") all of the units of limited partnership interest (the "Units") in
the Partnership held by the undersigned or, if less than all such Units, the
number set forth below in the signature box, at a purchase price equal to $815
per Unit, less the amount of any distributions made or declared with respect
to the Units between August 20, 1999 and the Expiration Date, and upon the
other terms and subject to the conditions set forth in the Offer to Purchase
(the "Offer to Purchase") dated September 2, 1999 (the "Offer Date") and
amended on September 10, 1999 and September 23, 1999 and in this Letter of
Transmittal, as each may be supplemented or amended from time to time (which
together constitute the "Offer"). Receipt of the Offer to Purchase is hereby
acknowledged. The Purchaser is offering to purchase all 44,718 Units in the
Partnership. Therefore, the Purchaser may, subject to acceptance of the Units
tendered, purchase all of the Units you tender. However, if Units are validly
tendered and not properly withdrawn prior to October 15, 1999 (the "Expiration
Date") unless extended, and the purchase of all such Units would result in
there being less than 350 Unitholders, the Purchaser will purchase only 99% of
the total number of Units so tendered by each limited partner with adjustments
rounded up or down, at the sole discretion of the Purchaser, to avoid the
purchase of fractional Units. Subject to and effective upon acceptance for
payment of any of the Units tendered hereby, the undersigned hereby sells,
assigns and transfers to, or upon the order of, Purchaser all right, title and
interest in and to such Units which are purchased pursuant to the Offer. The
undersigned hereby irrevocably constitutes and appoints the Purchaser as the
true and lawful agent and attorney-in-fact and proxy of the undersigned with
respect to such Units, with full power of substitution (such power of attorney
and proxy being deemed to be an irrevocable power and proxy coupled with an
interest), to deliver such Units and transfer ownership of such Units, on the
books of the Partnership, together with all accompanying evidences of transfer
and authenticity, to or upon the order of the Purchaser and, upon payment of
the purchase price in respect of such Units by the Purchaser, to exercise all
voting rights and to receive all benefits and otherwise exercise all rights of
beneficial ownership of such Units all in accordance with the terms of the
Offer. Subject to and effective upon the purchase of any Units tendered
hereby, the undersigned hereby requests that the Purchaser be admitted to the
Partnership as a "substitute Limited Partner" under the terms of the Agreement
of Limited Partnership of the Partnership. Upon the purchase of Units pursuant
to the Offer, all prior proxies and consents given by the undersigned with
respect to such Units will be revoked and no subsequent proxies or consents
may be given (and if given will not be deemed effective). In addition, by
executing this Letter of Transmittal, the undersigned assigns to the Purchaser
all of the undersigned's rights to receive distributions from the Partnership
with respect to Units which are purchased pursuant to the Offer, other than
distributions declared or paid through the Expiration Date and to change the
address of record for such distributions on the books of the Partnership. Upon
request, the Seller will execute and deliver, and irrevocably directs any
custodian to execute and deliver, any additional documents deemed by the
Purchaser to be necessary or desirable to complete the assignment, transfer
and purchase of such Units.

   The undersigned hereby represents and warrants that the undersigned owns
the Units tendered hereby within the meaning of Rule 13d-3 under the
Securities Exchange Act of 1934, as amended, and has full power and authority
to validly tender, sell, assign and transfer the Units tendered hereby, and
that when any such Units are purchased by the Purchaser, the Purchaser will
acquire good, marketable and unencumbered title thereto, free and clear of all
liens, restrictions, charges, encumbrances, conditional sales agreements or
other obligations relating to the sale or transfer thereof, and such Units
will not be subject to any adverse claim. Upon request, the undersigned will
execute and deliver any additional documents deemed by the Purchaser to be
necessary or desirable to complete the assignment, transfer and purchase of
Units tendered hereby.

   The undersigned understands that a tender of Units to the Purchaser will
constitute a binding agreement between the undersigned and the Purchaser upon
the terms and subject to the conditions of the Offer. The undersigned
recognizes the right of the Purchaser to effect a change of distribution
address to Two North Riverside Plaza, Chicago, Illinois 60606. The undersigned
recognizes that under certain circumstances set forth in the Offer to
Purchase, the Purchaser may not be required to accept for payment any of the
Units tendered hereby. In such event, the undersigned understands that any
Letter of Transmittal for Units not accepted for payment will be destroyed by
the Purchaser. All authority herein conferred or agreed to be conferred shall
survive the death or incapacity of the undersigned and any obligations of the
undersigned shall be binding upon the heirs, personal representatives,
successors and assigns of the undersigned. Except as stated in the Offer to
Purchase, this tender is irrevocable.

                                       2
<PAGE>

                                 SIGNATURE BOX
   (Please complete Boxes A, B, C and D on the following pages as necessary)

 Please sign and print your name and insert your Taxpayer Identification
 Number or Social Security Number, address, telephone number and number of
 Units being tendered in the spaces provided below. For joint owners, each
 joint owner must sign and provide the above-listed information. (See
 Instruction 1) The signatory hereby certifies under penalties of perjury the
 statements in Box B, Box C and, if applicable, Box D.

                                          X __________________________________
                                           (Signature of Owner)Date

 If the undersigned is tendering less than all Units held, the number of
 Units tendered is set forth below. Otherwise, all Units held by the
 undersigned are tendered hereby.

                                          X __________________________________
                                           (Signature of Owner)Date

                                          Name (Printed) _____________________

                                          Taxpayer I.D. or Social # __________

                                          Address ____________________________

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

                                          Telephone No. (day) ________________

                                                     (eve) ___________________

 Units Being Tendered



                                     BOX A

                         Medallion Signature Guarantee
                           (Required for all Sellers)

                              (See Instruction 1)

 Name and Address of Eligible Institution ____________________________________

 Authorized Signature _______________     Title ______________________________

 Name _______________________________     Date _______________________________


                                       3
<PAGE>


                                     BOX B
                              SUBSTITUTE FORM W-9
                           (See Instruction 3--Box B)

    The person signing this Letter of Transmittal hereby certifies the
 following to the Purchaser under penalties of perjury:

     (i) The TIN set forth in the Signature Box is the correct TIN of the
  Unitholder, or if this box [ ] is checked, the Unitholder has applied for
  a TIN. If the Unitholder has applied for a TIN, a TIN has not been issued
  to the Unitholder, and either: (a) the Unitholder has mailed or delivered
  an application to receive a TIN to the appropriate IRS Center or Social
  Security Administration Office; or (b) the Unitholder intends to mail or
  deliver an application in the near future (it being understood that if the
  Unitholder does not provide a TIN to the Purchaser within sixty (60) days,
  31% of all reportable payments made to the Unitholder thereafter will be
  withheld until a TIN is provided to the Purchaser); and

       (ii) Unless this box [ ] is checked, the Unitholder is not subject to
  backup withholding either because the Unitholder: (a) is exempt from
  backup withholding; (b) has not been notified by the IRS that the
  Unitholder is subject to backup withholding as result of a failure to
  report all interest or dividends; or (c) has been notified by the IRS that
  such Unitholder is no longer subject to backup withholding.

    Note: Place an "X" in the box in (ii) if you are unable to certify that
 the Unitholder is not subject to backup withholding.



                                     BOX C
                                FIRPTA AFFIDAVIT
                           (See Instruction 3--Box C)

    Under Section 1445(e)(5) of the Internal Revenue Code and Treas. Reg.
 1.1445-11T(d), a transferee must withhold tax equal to 10% of the amount
 realized with respect to certain transfers of an interest in a partnership
 if 50% or more of the value of its gross assets consists of U.S. real
 property interests and 90% or more of the value of its gross assets consists
 of U.S. real property interests plus cash equivalents, and the holder of the
 partnership interest is a foreign person. To inform the Purchaser that no
 withholding is required with respect to the Unitholder's interest in the
 Partnership, the person signing this Letter of Transmittal hereby certifies
 the following under penalties of perjury:

     (i) Unless this box [ ] is checked, the Unitholder, if an individual,
  is a U.S. citizen or a resident alien for purposes of U.S. income
  taxation, and if other than an individual, is not a foreign corporation,
  foreign partnership, foreign estate or foreign trust (as those terms are
  defined in the Internal Revenue Code and Income Tax Regulations); (ii) the
  Unitholder's U.S. social security number (for individuals) or employer
  identification number (for non-individuals) is correctly printed in the
  Signature Box; and (iii) the Unitholder's home address (for individuals),
  or office address (for non-individuals), is correctly printed in the
  Signature Box. If a corporation, the jurisdiction of incorporation is
                            . The person signing this Letter of Transmittal
  understands that this certification may be disclosed to the IRS by the
  Purchaser and that any false statements contained herein could be punished
  by fine, imprisonment, or both.


                                       4
<PAGE>


                                     BOX D
                              SUBSTITUTE FORM W-8
                           (See Instruction 4--Box D)

    By checking this box [ ], the person signing this Letter of Transmittal
 hereby certifies under penalties of perjury that the Unitholder is an
 "exempt foreign person" for purposes of the backup withholding rules under
 the U.S. federal income tax laws, because the Unitholder:

     (i) Is a nonresident alien individual or a foreign corporation,
  partnership, estate or trust;

     (ii) If an individual, has not been and plans not to be present in the
  U.S. for a total of 183 days or more during the calendar year; and

     (iii) Neither engages, nor plans to engage, in a U.S. trade or business
  that has effectively connected gains from transactions with a broker or
  barter exchange.


                                       5
<PAGE>

                                 INSTRUCTIONS

             Forming Part of the Terms and Conditions of the Offer

   1. Tender, Signature Requirements; Delivery. After carefully reading and
completing this Letter of Transmittal, in order to tender Units, a Unitholder
must sign at the "X" in the Signature Box of this Letter of Transmittal and
insert the Unitholder's correct Taxpayer Identification Number or Social
Security Number ("TIN"), address, telephone number and number of Units being
tendered in the spaces provided below the signature. If this Letter of
Transmittal is signed by the registered Unitholder of the Units, a Medallion
signature guarantee on this Letter of Transmittal is required. Similarly, if
Units are tendered for the account of a member firm of a registered national
security exchange, a member firm of the National Association of Securities
Dealers, Inc. or a commercial bank, savings bank, credit union, savings and
loan association or trust company having an office, branch or agency in the
United States (each an "Eligible Institution"), a Medallion signature
guarantee is required. In all other cases, signatures on this Letter of
Transmittal must be Medallion guaranteed by an Eligible Institution, by
completing the Signature Guarantee set forth in Box A of this Letter of
Transmittal. A Medallion Signature Guarantee is provided by your bank or
brokerage house. If you obtain a Medallion Signature Guarantee from a bank,
brokerage house or trust company, a Corporate Resolution (with a raised
corporate seal) from the bank, brokerage house or trust company must be
included (stating that the Guarantor is an authorized signatory). If any
tendered Units are registered in the names of two or more joint holders, all
such holders must sign this Letter of Transmittal. If this Letter of
Transmittal is signed by trustees, administrators, guardians, attorneys-in-
fact, officers of corporations, or others acting in a fiduciary or
representative capacity, such persons should so indicate when signing and must
submit proper evidence satisfactory to the Purchaser of their authority to so
act. For Units to be validly tendered, a properly completed and duly executed
Letter of Transmittal, together with any required signature guarantees in Box
A, and any other documents required by this Letter of Transmittal, must be
received by the depositary prior to or on the Expiration Date at its address
or facsimile number set forth on the front of this Letter of Transmittal. No
alternative, conditional or contingent tenders will be accepted. All tendering
Unitholders by execution of this Letter of Transmittal waive any right to
receive any notice of the acceptance of their tender.

   2. Transfer Taxes. The Purchaser will pay or cause to be paid all transfer
taxes, if any, payable in respect of Units accepted for payment pursuant to
the Offer.

   3. U.S. Persons. A Unitholder who or which is a United States citizen or
resident alien individual, a domestic corporation, a domestic partnership, a
domestic trust or a domestic estate (collectively "United States Persons"), as
those terms are defined in the Internal Revenue Code and Income Tax
Regulations, should complete the following:

     Box B--Substitute Form W-9. In order to avoid 31% federal income tax
  backup withholding, the Unitholder must provide to the Purchaser the
  Unitholder's correct Taxpayer Identification Number or Social Security
  Number ("TIN") in the space provided below the signature line and certify,
  under penalties of perjury, that such Unitholder is not subject to such
  backup withholding. The TIN that must be provided is that of the registered
  Unitholder. If a correct TIN is not provided, penalties may be imposed by
  the Internal Revenue Service ("IRS"), in addition to the Unitholder being
  subject to backup withholding. Certain Unitholders (including, among
  others, all corporations) are not subject to backup withholding. Backup
  withholding is not an additional tax. If withholding results in an
  overpayment of taxes, a refund may be obtained from the IRS.

     Box C--FIRPTA Affidavit. To avoid potential withholding of tax pursuant
  to Section 1445 of the Internal Revenue Code, each Unitholder who or which
  is a United States Person (as defined Instruction 3 above) must certify,
  under penalties of perjury, the Unitholder's TIN and address, and that the
  Unitholder is not a foreign person. Tax withheld under Section 1445 of the
  Internal Revenue Code is not an additional tax. If withholding results in
  an overpayment of tax, a refund may be obtained from the IRS.

                                       6
<PAGE>

   4. Box D--Foreign Persons. In order for a Unitholder who is a foreign person
(i.e., not a United States Person as defined in 3 above) to qualify as exempt
from 31% backup withholding, such foreign Unitholder must certify, under
penalties of perjury, the statement in BOX D of this Letter of Transmittal
attesting to that foreign person's status by checking the box preceding such
statement. However, such person will be subject to withholding of tax under
Section 1445 of the Code.

   5. Additional Copies of Offer to Purchase and Letter of
Transmittal. Requests for assistance or additional copies of the Offer to
Purchase and this Letter of Transmittal may be obtained from the Purchaser by
calling (312) 474-1300.

                                       7

<PAGE>

EX-99.(a)(5)            SUPPLEMENT TO OFFER TO PURCHASE          Exhibit (a)(5)

                       ERP OPERATING LIMITED PARTNERSHIP
                               (THE "Purchaser")

                     IS OFFERING TO PURCHASE ALL UNITS OF
                        LIMITED PARTNERSHIP INTEREST OF
                                 (THE "Offer")

                             ANGELES PARTNERS XII
                              (THE "Partnership")

                           FOR $815 PER UNIT IN CASH
                              (THE "Offer Price")

   We will accept all Units (as defined below) in response to the Offer in our
Offer to Purchase, dated September 2, 1999, as amended and supplemented from
time to time. The Offer is not subject to a minimum number of Units being
tendered. If Units are validly tendered and not properly withdrawn prior to
October 15, 1999 (the "Expiration Date"), unless extended, and the purchase of
all such Units would result in there being less than 350 Unitholders, we will
purchase only 99% of the total number of Units so tendered by each limited
partner.

   We will pay for accepted Units promptly after the Expiration Date.

   The Offer Price will be reduced for any distributions declared or made by
the Partnership between August 20, 1999 and the Expiration Date, unless
further extended. THE PURCHASER WILL PAY ANY TRANSFER FEES, BROKERAGE FEES OR
COMMISSION THAT MAY ARISE UPON THE TENDER OF UNITS TO THE PURCHASER IN
CONNECTION WITH ITS OFFER (generally, up to 10% of the sales price, subject to
a $150-200 minimum commission per trade).

   SEE "RISK FACTORS" IN THE OFFER TO PURCHASE, DATED SEPTEMBER 2, 1999, FOR A
DESCRIPTION OF RISK FACTORS THAT SHOULD BE CONSIDERED IN CONNECTION WITH THE
OFFER.

   If you desire to accept the Offer, you should complete and sign the
enclosed yellow letter of transmittal (the "Letter of Transmittal") in
accordance with the instructions thereto and mail or deliver the signed Letter
of Transmittal and any other required documents to MMS Escrow and Transfer
Agency, Inc. (the "Depositary"), at one of its addresses set forth on the
front cover of the yellow Letter of Transmittal.

   Questions and requests for assistance or for additional copies of the Offer
to Purchase or the Letter of Transmittal may also be directed to the
Depositary at (888) 292-4264.

   We are offering to purchase all of the outstanding limited partnership
interests (the "Units") in the Partnership for the Offer Price of $815 per
Unit, net to the seller in cash, without interest, less the amount of
distributions, if any, declared or made by the Partnership in respect of any
Unit from August 20, 1999 until the Expiration Date, unless further extended.
The Offer is made upon the terms and subject to the conditions set for in the
Offer to Purchase dated September 2, 1999, Amendments to the Offer to Purchase
dated September 10, 1999 and September 23, 1999, this Supplement dated
September 23, 1999, and the accompanying Letter of Transmittal.

   We have extended the Expiration Date of the Offer to October 15, 1999,
12:00 midnight, central standard time, unless further extended. If you desire
to accept the Offer, you must complete and sign the yellow Letter of
Transmittal in accordance with the instructions contained therein and forward
or hand deliver it, together with any other required documents, to the
Depositary. You may withdraw your tender of Units pursuant to the Offer at any
time prior to the Expiration Date and, unless accepted for payment as provided
in the Offer to Purchase, may also be withdrawn any time on or after November
9, 1999.
<PAGE>

   The yellow Letter of Transmittal and any other required documents should be
sent or delivered by each tendering Unitholder or such Unitholder's broker,
dealer, bank, trust company or other nominee to the Depositary at one of its
addresses set forth below or faxed to the Depositary to the number below, with
an original copy sent in the mail thereafter. If you completed and delivered
the Purchaser's pink Letter of Transmittal to the Depositary and have not
withdrawn such tender, you do not need to complete the yellow Letter of
Transmittal for your Units to be tendered to the Purchaser.

                       THE DEPOSITARY FOR THE OFFER IS:

                     MMS ESCROW AND TRANSFER AGENCY, INC.

      By Hand or Overnight Courier:         By Mail:


      MMS Escrow and Transfer Agency, Inc.  MMS Escrow and Transfer Agency,
      1845 Maxwell St., Suite 101           Inc.
      Troy, MI 48084                        P.O. Box 7090
                                            Troy, MI 48007

      By Facsimile: (248) 614-4536

   For more information, please call the Depositary at (888) 292-4264.

<PAGE>


EX-99.(a)(6)                 LETTER TO UNITHOLDERS               Exhibit (a)(6)

                              September 23, 1999

                     ERP OPERATING LIMITED PARTNERSHIP HAS
                     INCREASED ITS OFFER PRICE TO $815 PER
                    UNIT OF LIMITED PARTNERSHIP INTEREST OF
                             ANGELES PARTNERS XII

                       New Offer Price of $815 per Unit.

   We are increasing our offer price for your limited partnership interests
(the "Units") in Angeles Partners XII (the "Partnership") from $750 per Unit
to $815 per Unit.

   We are offering to acquire up to 44,718 Units (the "Offer"). The Offer is
not subject to any minimum number of Units being tendered. We are also
extending the expiration date of the Offer to October 15, 1999, 12:00
midnight, eastern standard time.

   As we are increasing the offer price from $750 to $815 before the
expiration date of the Offer, October 15, 1999, unless extended, this
increased offer price will be paid with respect to all Units that are
purchased by us pursuant to the Offer, whether or not such Units are tendered
prior to or after this increase in consideration.

   Our offer price of $815 per unit will be decreased by the amount of any
distribution declared or made with respect to the Units between August 20,
1999 and October 15, 1999, or such other date to which the Offer may further
be extended. YOU WILL NOT BE REQUIRED TO PAY ANY COMMISSIONS OR FEES IN
CONNECTION WITH ANY DISPOSITION OF YOUR UNITS PURSUANT TO THE OFFER
(generally, up to 10% of the sale price, subject to a $150-200 minimum
commission per trade).

   Please refer to our Offer to Purchase dated September 2, 1999, Amendment
No. 1 to the Offer to Purchase dated September 10, 1999, Amendment No. 2 to
the Offer to Purchase dated September 23, 1999, and the Supplement to the
Offer to Purchase dated September 23, 1999, for additional information about
the Offer.

   If you would like to tender your Units to be purchased by us for $815 per
Unit, and have not yet completed the pink ERP Letter of Transmittal and
delivered it to MMS Escrow and Transfer Agency (the "Depositary"), please
complete the yellow Letter of Transmittal we are sending with this letter and
deliver it to the Depositary at the address listed on the yellow ERP Letter of
Transmittal in the gold envelope provided. If you completed and delivered the
pink ERP Letter of Transmittal to the Depositary and have not withdrawn such
tender, you do not need to complete the yellow ERP Letter of Transmittal for
your Units to be tendered to ERP. In this case, the pink ERP Letter of
Transmittal shall be sufficient to tender your Units for purchase by ERP.

   If you have any questions or need assistance, please call the Depositary at
(888) 292-4264.

       The Offer expires on (unless further extended) October 15, 1999.


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