I remember a post thread a year or so ago about there being some plans for developing that space, but obviously those aren’t in the works in a visible way.
I live in the neighborhood and interested in the space, so I am curious if anyone here has details for contacting the owner handy.
King Country Parcel Viewer lists the owner here: http://info.kingcounty.gov/Assessor/eRealProperty/Dashboard. .
Maybe contact them and see if they have plans ?