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                                                                  Exhibit (a)(1)


                               ANGELES PARTNERS XI
                     1873 South Bellaire Street, 17th Floor
                             Denver, Colorado 80222

                                  May 13, 1999

Dear Limited Partner:

         Enclosed is the Schedule 14D-9 which was filed by Angeles Partners XI 
(the "Partnership") with the Securities and Exchange Commission in connection
with an offer by AIMCO Properties, L.P., a Delaware limited partnership (the
"AIMCO Operating Partnership"), to purchase units of limited partnership
interest in the Partnership.

         The Partnership's general partner, Angeles Realty Corporation II, is an
affiliate of the AIMCO Operating Partnership and therefore has certain conflicts
of interest in connection with the response to the offer. AS A RESULT OF THE
EXISTING AND POTENTIAL CONFLICTS OF INTEREST, THE PARTNERSHIP AND THE GENERAL
PARTNER ARE REMAINING NEUTRAL AND MAKING NO RECOMMENDATION AS TO WHETHER LIMITED
PARTNERS SHOULD TENDER THEIR UNITS IN RESPONSE TO THE OFFER. Nevertheless, the
General Partner does believe the offer is fair to the holders of units.

         Limited Partners should carefully read the enclosed Schedule 14D-9, the
Offer to Purchase of the AIMCO Operating Partnership, dated May 13, 1999
relating to the offer to acquire units of the Partnership (the "Offer to
Purchase"), and the related Letter of Transmittal and Instructions. Certain
information in the Schedule 14D-9 is incorporated by reference to the Offer to
Purchase.


                                       Angeles Realty Corporation II         
                                       General Partner                       

                                       By:      /s/ Patrick J. Foye          
                                          --------------------------------   
                                                Executive Vice President     



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