Spokeswoman Yolanda Fierro says if the Gold Pyramid House's owners decide to demolish, they will replace the structure in Wadsworth with a "bigger and better" pyramid.
Fierro says the owners have determined the water damage from firefighting efforts Tuesday was too extensive, but that the fire damage is limited to a couple of rooms.
The Gold Pyramid House was built in 1977 as a private residence but was later opened for public tours. A 55-foot-tall (17-meter-tall) statue of Ramses II stands outside.
The six-story structure has a moat and contains a replica of King Tut's tomb.
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