LOS ANGELES—Voters have approved a tax measure to fund the return of a streetcar line to downtown Los Angeles after half a century.

The city clerk says Monday night that 73 percent of about 2,000 ballots cast by downtown property owners favored the measure, with 67 percent required. The 110 remaining votes were not enough to change the outcome.

The measure is expected to raise $62.5 million—about half the $125 million estimated cost of the trolley system. The remaining funding is expected to come from federal grants.

The tax vote was the biggest obstacle to building the streetcar line that boosters have pushed the streetcar as a major step in downtown LA's renaissance.

The line would run on a four-mile Broadway-to-Figueroa loop that includes Disney Hall and Staples Center.