H.R. 4438 would require the Secretary of Interior to conduct a study to identify lands within Bexar and Wilson Counties, Texas, for inclusion in the boundaries of the San Antonio Missions National Historical Park. The Secretary would be required to report the findings of the study within three years of funding being made available.

In addition, the legislation would authorize the Secretary to enter into a cooperative agreement with the City of San Antonio or its designee, for operation of a facility outside the boundary of the park to provide office space for the park headquarters, and a center for research and education. Under the legislation, the Secretary would be authorized to plan design, construct, and install these facilities.

Finally, the legislation would expand the boundaries of the park by an additional 151 acres.