Mini-warehouse giant Public Storage has filed preliminary paperwork with Seattle planning officials to add a five-story building to its self-storage complex in South Lake Union near the Mercer Street ramps to Interstate 5.

Mini-warehouse giant Public Storage has filed preliminary paperwork with Seattle planning officials to add a five-story building to its self-storage complex in South Lake Union near the Mercer Street ramps to Interstate 5.

It would be built just south of Public Storage’s historic five-story brick warehouse at 700 Fairview Ave. N., constructed in 1914 as a Ford auto plant. A newer, shorter building would be demolished.

The city’s advisory Queen Anne/Magnolia Design Review Board is tentatively scheduled to consider the expansion Sept. 1. The proposal also needs approval from the city’s Landmarks Preservation Board because the site is a designated historic landmark.