City Hall plays itself in Jake’s first stop on his tail of Hollis Mulwray, at a meeting about a potential aqueduct for Los Angeles. Proceedings are interrupted by an angry Valley sheep farmer and his flock.

Jake follows Hollis to a dry riverbed (actually the Foothill Boulevard Bridge over the Tujunga Wash), but later finds a homeless man drowned by a mysterious influx of water.

Finally, Hollis heads to this cliffside park in San Pedro and ends up staying the night.

Jake’s associate photographs Hollis and Noah Cross arguing outside the Pig ’n Whistle, actually the Pacific Dining Car Downtown.

In the movie’s third-most-famous scene, Jake pretends to photograph his associate, as cover for snapping Hollis and Katherine, while boating on Echo Park Lake.

Jake climbs up on the tile roof at this courtyard complex to photograph Hollis and Katherine embracing. The real complex is called Mi Casa and was designed by husband-and-wife team Arthur and Nina Zwebell.

It’s only bad news at the Oak Pass reservoir, played by the Stone Canyon Reservoir: Hollis is found dead in the water here and later a heavy (played by Polanski) catches Jake snooping and slices his nose.

Koreatown’s old filming standby The Prince plays the long-gone Brown Derby, where Jake and Evelyn meet for drinks and conspiracy talk.

Outside the fake Brown Derby, a valet fetches Jake and Evelyn’s cars at what is actually the Millennium Biltmore’s limo ramp.

UPDATE: A reliable tipster believes (and photo evidence seems to confirm) that the Noah Cross estate was actually the Portuguese Bend Riding Club in Rancho Palos Verdes, not El Rancho Escondido on Catalina.

This orchard in Moorpark is the setting for a truly excellent car/horse chase.

Jake and Evelyn visit this rest home, formerly the Eastern Star Home and now the Archer School For Girls, to meet some of the old folks who seem to be buying up huge tracts of land in the Valley.

Ida Sessions, who tricks Jake into thinking she’s Evelyn Mulwray at the beginning of the movie, lives and dies in a courtyard apartment in Echo Park.

Jake escapes the clutches of the LAPD with help from his client Curly, who lives in San Pedro; in reality, this house is in East Hollywood.

It all comes to a head in Chinatown, near Evelyn’s butler’s apartment at 1712 Alameda (but actually on Spring Street).