Local lawmakers and county officials pushed back on the University of Michigan’s plan to buy 187 acres from Concordia University in Ann Arbor, arguing the land should be reserved for housing, recreation and other community uses. The proposed $60 million acquisition awaits approval by UM’s Board of Regents, and critics said the property’s tax-exempt status would expand the university’s already large Ann Arbor footprint by roughly 10 percent at a time of rising housing costs. Washtenaw County officials sent a letter to UM’s Board of Regents and pointed to a unanimous Ann Arbor City Council resolution opposing the purchase. The outcome is expected to hinge on whether UM can align the acquisition with institutional needs while addressing local affordability and tax-base concerns.