In the context of the input sentence, determine the relationship between 'MoneyGram' and 'DALLAS'.
Options: owner of, product/material produced, headquarters location, employer

DALLAS (June 30, 2015) (GLOBE NEWSWIRE) -- MoneyGram ( MGI ), a global provider of innovative money transfer services, is expanding its official check network through a new agreement with Founders Federal Credit Union to provide official check services.
headquarters location