There's a large rainbow mural on Sycamore immediately west of the underpass that goes under 980 in the Hoover-Foster neighborhood. It says "Oakland" in big letters and in the upper left it says "West" making it read "West Oakland." It also reads "West Oakland" in the lower left.
If you have more info about it, please add.
Artists are Slang 500, Tigran and Pash