Art experts say buildings tagged by "Banksy" may double in value.
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LOS ANGELES -- A secretive and highly-sought-after British graffiti artist has left his mark in the Los Angeles area, and some say the value of the buildings he chose as his canvas may have just doubled in value.

"Banksy" is known for his satirical public artwork. Not too many people know what he looks like, but they sure know his markings.

The elusive artist left his mark on two downtown Los Angeles buildings over the weekend. And what some might call graffiti, others consider his vandalism a rare collectible.

"He has a huge amount of street credit for the fact that he's done all these things so public against the law and never been caught," gallery owner Robert Berman said.

Folks in London actually seek out properties with Banksy's markings.