Despite a $1.5 million reduction in the Quincy High School demolition budget, the 89-year-old structure is still scheduled to come down this summer. The budget cut, made by city councilors in June, will affect only the later stages of the $4.1 million project, said Christopher Walker, spokesman for Mayor Thomas Koch. The demolition is “not affected by any vote of the council,” Walker said. “What is affected is landscaping and final completion of the campus piece of the project.” Walker added that the mayor will return to the council for the additional funding sometime in the fall. Councilors rejected the funding for the later half of the project because they wanted firmer information on costs.