A city reassessment of commercial properties will yield an additional $65 million annually for the district, and leaders have said they will spend some of the windfall on the teachers' contract. They also will spend part of the city money to end virtually all split classes citywide, to bring in more aid for English-language learners, and to hire teachers to end "leveling" — the process of adjusting the teaching force based on actual enrollment, in which some schools lose educators two months into the school year.