Ambaum Blvd. remained unsurfaced until 1921, when it was paved as far as SW 112th. Until the 1930s, when First Avenue South was considered for paving, Ambaum was one of the main routes to Seattle. Ambaum was widened to four lanes in the 1950s due to increased traffic. A multi-million-dollar paving and utilities improvement project was completed in 1977, resurfacing and widening Ambaum from White Center to Burien.
In 2002, Burien determined that its Northwest sector lacked open and recreational space, with no active park within walking distance at the north end of the Ambaum corridor. The Burien Parks, Recreation and Open Space Plan identified a priority for developing a neighborhood park to serve residents west of Ambaum and north of SW 132nd. Burien identified several properties that might qualify as a park, with a requirement that the site must also provide visibility and safety.
In 2001, the City had identified two parcels on the Ambaum corridor just north of 128th SW that, if purchased together, would provide space for a “playtoy” for children as well as a sports court. City staff and real estate consultants tried to reach voluntary purchase agreements with both property owners. The owner of the south parcel was not interested in selling to the City, making condemnation likely. The owner of the north parcel was willing to sell to the City.
The Suyama Family Limited Partnership granted its lot to the City for $190,000 on March 25, 2003. Plans for the new Jacob Ambaum Park included the playground and basketball courts, restroom, picnic areas, and plaza. Phase I construction of the park was completed in February 2007, and the park opened for public use. The complete project design for Phase II was completed in March, 2007 and the completed Park was reopened in the summer of 2007.