Investment losses at the endowments led to cutbacks and delayed construction projects, draining at least $1.35 billion from local economies for the next three years, said the study by Tellus Institute and the Center for Social Philanthropy. The report also surveyed Dartmouth College, Massachusetts Institute of Technology, Boston College, Boston University and Brandeis University, and was partly funded by the Service Employees International Union, which represents employees at Harvard and other schools.