FREMONT -- Early returns Tuesday night showed that the school district's $650 million bond measure maintaining a comfortable margin of victory.

Measure E, the largest single school bond measure in Alameda County history, was leading by nearly two-thirds majority but needed only 55 percent of the vote for approval.

Fremont Unified School District officials said the bond measure was needed to renovate the city's aging schools, some of which are nearly 50 years old.

Opponents have argued that the bond measure set aside too much money for cost overruns, would not properly address the district's weathered campuses and would lead to wasteful spending.

Contact Chris De Benedetti at 510-353-7011 or follow him at Twitter.com/cdebenedetti.