EXHIBIT 3.23 [State of Texas Seal] FILED Office of the Secretary of State In the Office of the Corporations Section Secretary of State of Texas P.O. Box 13697 March 27, 2001 Austin, Texas 78711-3697 Corporations Section _________________________________________________________________________ CERTIFICATE OF LIMITED PARTNERSHIP 1. The name of the limited partnership is Legacy Operating Company L.P. 2. The street address of its proposed registered office in Texas is (a P.O. Box is not sufficient) 350 N. St. Paul Dallas, TX 75201 and the name of its proposed registered agent in Texas at such address is CT Corporation System, 350 North St. Paul, Dallas, TX 75201 3. The address of the principal office in the United States where records of the partnership are to be kept or made available is 4050 West Park Blvd., Plano, TX 75093 4. The name, the mailing address, and the street address of the business or residence of each general partner is as follows: Name MAILING ADDRESS STREET ADDRESS (include city, state, (include city, state, zip code) zip code) MTH-Texas GP Inc. 6613 N. Scottsdale Road 6613 N. Scottsdale Road Suite 200 Suite 200 Scottsdale, AZ 85250 Scottsdale, AZ 85250 Date Signed: 3/23/01 /s/ Richard T. Morgan ____________________ General Partner(s) Richard T. Morgan Vice President