Envoy Mortgage Ltd., a full-service mortgage banking firm, signed a 30,907-square-foot headquarters lease renewal and expansion at the Halbouty Center in Houston, TX. The company, which will now remain in the property until 2018, re-signed for two spaces on the third and fifth floors for a total of 25,127 square feet. The tenant also expanded into 5,780 square feet on the fifth while giving up 4,233 square feet on the first floor.