Call the Trust Beneficiary Call Center

The Trust Beneficiary Call Center is a centralized location for asking questions and receiving timely responses.


  • 7:00 AM to 6:00 PM (Mountain Time) Monday through Friday
  • 8:00 AM to Noon (Mountain Time) on Saturday.
  • Ensure your contact information is correct
  • Ask any questions you may have about the Program
  • Indicate your desire to sell

Whereabouts Unknown

The Department does not have current contact information for approximately 33,000 owners of fractional interests, referred to as “WAU.”

  • Search list of whereabouts unknown by name
  • Information needed to request OST forms:
  • Name of account holder
  • Current Address
  • Telephone Number


Office of the Special Trustee (OST)

Attn: Trust Beneficiary Call Center

4400 Masthead St., NE

Albuquerque, NM 87109



Toll Free: (888) 678-6836

Where Can I Get More Information?

  • Website. The Buyback Program Website has resources for both landowners and tribes. Visit
  • Outreach Events. Assistance will be available at local outreach events to answer questions or assist with completing the Purchase Offer Package.

Back to Top

Read More: Frequently Asked Questions

Cheyenne River Sioux Tribe

Land Buy-Back Program

Website by Makoché Media