TMZ is reporting, “Big Bang Theory” star Johnny Galecki’s ranch home burned to the ground Monday night in a massive fire in San Luis Obispo.

The residence is said to be a Galecki’s second home getaway. The sprawling pad is located 190 miles from L.A.

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The ranch was torched along with other property in the 1,200 acre fire, that’s now 40% contained. We’re told the area is secure and no one can enter for now … the road is closed. Our sources say Johnny hasn’t seen the property since it burned down, and plans to show up when he gets the all clear … so he can salvage any memorabilia. We’re told he has lots of family and other mementos.