The measure would have authorized $25 million in bonds to pay for a new civic campus.
As of Tuesday night, the measure had a 53.18 percent "yes" vote.
Snohomish County elections officials were to release new returns late Wednesday afternoon.
A similar measure had fallen short when it got 57 percent in August 2012.
The measure easily exceeded the required turnout requirement of 40 percent of the number of ballots cast in the last general election.
City Manager John Caulfield said Wednesday morning that he expects the City Council to discuss what to do after election results are certified May 7,
Ballots still are coming from those mailed through Tuesday and those left at drop boxes Tuesday.
Evan Smith can be reached at firstname.lastname@example.org.
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