DALLAS — A plan to convert the vacant Houston Astrodome into a multipurpose center and hotel could require as much as $900 million of bond debt, according to Harris County officials.

Any bonds to redevelop the world’s first domed stadium would require voter approval, with an election not likely before 2012, according to Willie Loston, executive director of the stadium’s owner, the Harris County Sports and Convention Corp. The bonds would probably be listed on the ballot in pieces rather than as a single, large bond issue, Loston said.

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