7-Eleven now has its first outpost on the Lower East Side below East Houston Street. A new corporate location at 142 Delancey Street opened for business yesterday. The chain store is located within the old Loew’s Delancey Theater building, which also includes a Burger King and an AT&T store. In August, the Seward Park Co-op agreed to lease a space at 403 Grand Street to 7-Eleven for another branch of the international chain, in spite of strong opposition from a large residents’ group. That space is being leased to Chabad of the Lower East Side on a short-term basis. The company is in the midst of a huge expansion throughout Manhattan. Several locations have popped up in the East Village, including on the Bowery and on St. Mark’s Place.