There is a new monument in Santa Monica: Historic Belmar Park. It commemorates a historically African-American neighborhood that is no more extant. There is an interesting art installation with a hidden time capsule and a series of explicative panels.
Update: the coords have changed slightly; I have increased the difficulty level since you'll need to be stealthier not to be too conspicuous.
The cache is, as before, low.
Congratulations to Geojudy and Sunflower96 for being Firsts to Find!