The group led by John and Roberta Stagnone that is trying to restore the downtown State Theatre will receive a state grant that will enable it to develop a business and marketing plan for the property. State Representatives William Galvin of Canton and Louis Kafka of Stoughton and state Senator Brian Joyce of Milton spearheaded efforts to include $50,000 for the theater in the Massachusetts Historical Commission budget. The nonprofit Friends of the State Theatre has entered into a 20-year lease agreement for the building, which opened in 1927 and has been vacant since the Stoughton Cinema Pub closed in 2007. Stagnone, a former selectman, said the plan is designed to measure the impact the theater’s opening might have on the downtown, compared with similar renovations in Norwood and Foxborough. Those interested in getting involved or making a donation can go to statetheatre.us.