Another multi-episode location:

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Knight of the Chameleon
This is the courthouse complex as seen from the third season episode "Knight of the Chameleon". It's the site where the Chameleon escapes from custody disguised as the Judge, and Michael and K.I.T.T. are called in and pursue him...

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Knight of the Chameleon

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Knight of the Chameleon
They pull out from the parking space above, head out of the parking lot and speed southward down Rockwell Canyon Road:

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MSN Maps
I didn't realise this until I started to investigate the place on MSN Maps, but the location also featured in five other episodes! The main complex doubled for the Englehart Weapons Centre in Season 1's "Deadly Maneuvers":

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MSN Maps

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Deadly Maneuvers

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Deadly Maneuvers

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Deadly Maneuvers
It appeared as Arkett Industries in the Season Four episode "The Wrong Crowd":

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The Wrong Crowd

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The Wrong Crowd

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The Wrong Crowd
...and as Mark Taylor's stadium and headquarters in "Knights of the Fast Lane", in the third season:

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Knights of the Fast Lane
The field where K.I.T.T. learns to play football is nearby on the grounds, and hasn't changed a bit:

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Knights of the Fast Lane

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Knights of the Fast Lane

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MSN Maps (Circled are the goal posts K.I.T.T. turbos to win his extra point)

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Knight of the Fast Lane

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Knight of the Fast Lane

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MSN Maps (Above screencaps took place in circled area)
Some behind-the-scenes trivia -- the team that plays here is actually named the Cougars, just like in the show!
They used the area round the back for the Anderson Precious Metals Depository in Season Three's "Knight Strike":

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Knight Strike

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Knight Strike

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Knight Strike
Turns out that this is also one of the most sought-after locations we've all been searching for. It's other Knight Rider appearance -- from a completely different angle -- was as F.L.A.G. headquarters used in the reconstruction of K.I.T.T. in "Junk Yard Dog", also in the third season. This episode used three of the large parking lots at the north end of the property:

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MSN Maps

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Junk Yard Dog
One of the main buildings can be seen behind Michael and Bonnie in this first screencap:

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Junk Yard Dog
The floodlights at the corners of the "Knights of the Fast Lane" football field can be seen in the background of the next screencap:

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Junk Yard Dog
Some of the buildings are clear in the b.g. behind K.I.T.T. in this one, and correspond with the buildings in the MSN Birds Eye View:

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Junk Yard Dog

MSN Maps
The location:
College of Canyons,
26455 R. Rockwell Canyon Rd,
Valencia, CA.
How cool it must've been to be a student there in the mid-1980s!
More locations to come...