In 2009, the City of Bothell adopted plans to convert the southernmost blocks of SR 527 into a mixed-use boulevard and submitted a request to transfer a section of the highway from the state control. The proposed transfer received the recommendation of the state transportation commission in July 2010 and was passed by the state legislature in April 2011. As a result, the southernmost of SR 527 was decommissioned from the state highway system and the highway's southern terminus was moved from SR 522 to I-405. The $23 million boulevard, funded by a state grant and city revenue, was completed in August 2017 and added wider sidewalks, four sets of parallel parking lanes, a business access lane also designated for use by bicyclists, and medians to separate traffic.