Technically there is a small sliver between Leschi and Interstate 90 but otherwise it effectively borders I-90 to the south.
Leschi, Seattle (Wikipedia)Leschi is a neighborhood in the city of Seattle, Washington, United States. Located on the western shore of Lake Washington, the residential neighborhood was named by its 19th-century developer for Chief Leschi of the Nisqually tribe, who was executed by territorial authorities in 1858 in Pierce County, Washington.
Seattle Neighborhoods: Leschi — Thumbnail History (historylink.org)Seattle’s Leschi neighborhood is located along Lake Washington directly east of Pioneer Square. It was a neighborhood served by a cable car that went from Pioneer Square to Lake Washington along Yesler Way. Leschi lies south of Madrona Park and north of the Mount Baker neighborhood (the I-90 corridor). It is a place of steep hillsides and ravines, one of the scenic neighborhoods along the Lake Washington Boulevard.